Search

Your search keyword '"Chin M."' showing total 2,106 results
Start Over Author "Chin M."
2,106 results on '"Chin M."'

2. The LacI–Family Transcription Factor, RbsR, Is a Pleiotropic Regulator of Motility, Virulence, Siderophore and Antibiotic Production, Gas Vesicle Morphogenesis and Flotation in Serratia

Author

Chin M. Lee, Rita E. Monson, Rachel M. Adams, and George P. C. Salmond

Subjects
gas vesicles, Serratia, virulence, ribose operon, motility, antibiotics, Microbiology, QR1-502
Abstract

Gas vesicles (GVs) are proteinaceous, gas-filled organelles used by some bacteria to enable upward movement into favorable air/liquid interfaces in aquatic environments. Serratia sp. ATCC39006 (S39006) was the first enterobacterium discovered to produce GVs naturally. The regulation of GV assembly in this host is complex and part of a wider regulatory network affecting various phenotypes, including antibiotic biosynthesis. To identify new regulators of GVs, a comprehensive mutant library containing 71,000 insertion mutants was generated by random transposon mutagenesis and 311 putative GV-defective mutants identified. Three of these mutants were found to have a transposon inserted in a LacI family transcription regulator gene (rbsR) of the putative ribose operon. Each of these rbsR mutants was GV-defective; no GVs were visible by phase contrast microscopy (PCM) or transmission electron microscopy (TEM). GV deficiency was caused by the reduction of gvpA1 and gvrA transcription (the first genes of the two contiguous operons in the GV gene locus). Our results also showed that a mutation in rbsR was highly pleiotropic; the production of two secondary metabolites (carbapenem and prodigiosin antibiotics) was abolished. Interestingly, the intrinsic resistance to the carbapenem antibiotic was not affected by the rbsR mutation. In addition, the production of a siderophore, cellulase and plant virulence was reduced in the mutant, whereas it exhibited increased swimming and swarming motility. The RbsR protein was predicted to bind to regions upstream of at least 18 genes in S39006 including rbsD (the first gene of the ribose operon) and gvrA. Electrophoretic mobility shift assays (EMSA) confirmed that RbsR bound to DNA sequences upstream of rbsD, but not gvrA. The results of this study indicate that RbsR is a global regulator that affects the modulation of GV biogenesis, but also with complex pleiotropic physiological impacts in S39006.

Published
2017
Full Text
View/download PDF

3. High precision measurement of the radiative capture cross section of 238U at the n_TOF CERN facility

Author

Mingrone F., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Barbagallo M., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calviño F., Calviani M., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Durán I., Eleftheriadis C., Ferrari A., Fraval K., Furman V., Göbel K., Gómez-Hornillos M.B., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González E., Goverdovski A., Griesmayer E., Guerrero C., Gunsing F., Heftrich T., Hernández-Prieto A., Heyse J., Jenkins D.G., Jericha E., Käppeler F., Kadi Y., Karadimos D., Katabuchi T., Ketlerov V., Khryachkov V., Kivel N., Koehler P., Kokkoris M., Kroll J., Krtička M., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Lerendegui-Marco J., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P., Mastromarco M., Mendoza E., Mengoni A., Milazzo P.M., Mirea M., Mondelaers W., Paradela C., Pavlik A., Perkowski J., Plompen A.J.M., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego-Perez A., Robles M., Rubbia C., Ryan J.A., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Tagliente G., Tain J.L., Tarifeño-Saldivia A., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiss C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The importance of improving the accuracy on the capture cross-section of 238U has been addressed by the Nuclear Energy Agency, since its uncertainty significantly affects the uncertainties of key design parameters for both fast and thermal nuclear reactors. Within the 7th framework programme ANDES of the European Commission three different measurements have been carried out with the aim of providing the 238U(n,γ) cross-section with an accuracy which varies from 1 to 5%, depending on the energy range. Hereby the final results of the measurement performed at the n_TOF CERN facility in a wide energy range from 1 eV to 700 keV will be presented.

Published
2017
Full Text
View/download PDF

4. Measurement of the neutron capture cross section of the fissile isotope 235U with the CERN n_TOF total absorption calorimeter and a fission tagging based on micromegas detectors

Author

Balibrea-Correa J., Mendoza E., Cano-Ott D., Krtička M., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Barbagallo M., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calviño F., Calviani M., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Durán I., Eleftheriadis C., Ferrari A., Fraval K., Furman V., Göbel K., Guerrero C., Gómez-Hornillos M.B., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González E., Goverdovski A., Griesmayer E., Gunsing F., Heftrich T., Heinitz S., Hernández-Prieto A., Heyse J., Jenkins D.G., Jericha E., Käppeler F., Kadi Y., Karadimos D., Katabuchi T., Ketlerov V., Khryachkov V., Kivel N., Koehler P., Kokkoris M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Lerendegui-Marco J., Licata M., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P., Mastromarco M., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Paradela C., Pavlik A., Perkowski J., Plompen A.J.M., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego-Perez A., Robles M., Rubbia C., Ryan J.A., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Tagliente G., Tain J.L., Tarifeño-Saldivia A., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiss C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The accuracy on neutron capture cross section of fissile isotopes must be improved for the design of future nuclear systems such as Gen-IV reactors and Accelerator Driven Systems. The High Priority Request List of the Nuclear Energy Agency, which lists the most important nuclear data requirements, includes also the neutron capture cross sections of fissile isotopes such as 233,235U and 239,241Pu. A specific experimental setup has been used at the CERN n_TOF facility for the measurement of the neutron capture cross section of 235U by a set of micromegas fission detectors placed inside a segmented BaF2 Total Absorption Calorimeter.

Published
2017
Full Text
View/download PDF

5. High accuracy 234U(n,f) cross section in the resonance energy region

Author

Leal-Cidoncha E., Durán I., Paradela C., Tassan-Got L., Audouin L., Leal L.C., Naour C. Le, Noguere G., Tarrío D., Leong L.S., Altstadt S., Andrzejewski J., Barbagallo M., Bécares V., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gómez-Hornillos M.B., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Kokkoris M., Krtička M., Kroll J., Lampoudis C., Langer C., Lederer C., Leeb H., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P.F., Mastromarco M., Meaze M., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Robles M.S., Roman F., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

New results are presented of the 234U neutron-induced fission cross section, obtained with high accuracy in the resonance region by means of two methods using the 235U(n,f) as reference. The recent evaluation of the 235U(n,f) obtained with SAMMY by L. C. Leal et al. (these Proceedings), based on previous n_TOF data [1], has been used to calculate the 234U(n,f) cross section through the 234U/235U ratio, being here compared with the results obtained by using the n_TOF neutron flux.

Published
2017
Full Text
View/download PDF

6. Measurement of the 241Am neutron capture cross section at the n_TOF facility at CERN

Author

Mendoza E., Cano-Ott D., Altstadt S., Andriamonje S., Andrzejewski J., Audouin L., Balibrea J., Bécares V., Barbagallo M., Bečvář F., Belloni F., Berthier B., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calviño F., Calviani M., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Dillmann I., Domingo-Pardo C., Durán I., Dzysiuk N., Eleftheriadis C., Fernández-Ordóñez M., Ferrari A., Fraval K., Furman V., Gómez-Hornillos M.B., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González E., Goverdovski A., Gramegna F., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Heftrich T., Heinitz S., Hernández-Prieto A., Heyse J., Jenkins D.G., Jericha E., Käppeler F., Kadi Y., Karadimos D., Katabuchi T., Ketlerov V., Khryachkov V., Koehler P., Kokkoris M., Kroll J., Krtička M., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Lerendegui-Marco J., Licata M., Losito R., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P., Mastromarco M., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Paradela C., Pavlik A., Perkowski J., Plompen A.J.M., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego-Perez A., Robles M., Roman F., Rubbia C., Ryan J.A., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Tagliente G., Tain J.L., Tarifeño-Saldivia A., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vermeulen M.J., Versaci R., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiss C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

New neutron cross section measurements of minor actinides have been performed recently in order to reduce the uncertainties in the evaluated data, which is important for the design of advanced nuclear reactors and, in particular, for determining their performance in the transmutation of nuclear waste. We have measured the 241Am(n,γ) cross section at the n_TOF facility between 0.2 eV and 10 keV with a BaF2 Total Absorption Calorimeter, and the analysis of the measurement has been recently concluded. Our results are in reasonable agreement below 20 eV with the ones published by C. Lampoudis et al. in 2013, who reported a 22% larger capture cross section up to 110 eV compared to experimental and evaluated data published before. Our results also indicate that the 241Am(n,γ) cross section is underestimated in the present evaluated libraries between 20 eV and 2 keV by 25%, on average, and up to 35% for certain evaluations and energy ranges.

Published
2017
Full Text
View/download PDF

7. Dissemination of data measured at the CERN n_TOF facility

Author

Dupont E., Otuka N., Cabellos O., Aberle O., Aerts G., Altstadt S., Alvarez H., Alvarez-Velarde F., Andriamonje S., Andrzejewski J., Audouin L., Bacak M., Badurek G., Balibrea J., Barbagallo M., Barros S., Baumann P., Bécares V., Bečvář F., Beinrucker C., Belloni F., Berthier B., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brown A., Brugger M., Caamaño M., Calviani M., Calviño F., Cano-Ott D., Capote R., Cardella R., Carrapiço C., Casanovas A., Castelluccio D.M., Cennini P., Cerutti F., Chen Y.H., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Cosentino L., Couture A., Cox J., Damone L.A., David S., Deo K., Diakaki M., Dillmann I., Domingo-Pardo C., Dressler R., Dridi W., Duran I., Eleftheriadis C., Embid-Segura M., Fernández-Domínguez B., Ferrant L., Ferrari A., Ferreira P., Finocchiaro P., Fraval K., Frost R.J.W., Fujii K., Furman W., Ganesan S., Garcia A.R., Gawlik A., Gheorghe I., Gilardoni S., Giubrone G., Glodariu T., Göbel K., Gomez-Hornillos M.B., Goncalves I.F., Gonzalez-Romero E., Goverdovski A., Gramegna F., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Haight R., Harada H., Heftrich T., Heil M., Heinitz S., Hernández-Prieto A., Heyse J., Igashira M., Isaev S., Jenkins D.G., Jericha E., Kadi Y., Kaeppeler F., Kalamara A., Karadimos D., Karamanis D., Katabuchi T., Kavrigin P., Kerveno M., Ketlerov V., Khryachkov V., Kimura A., Kivel N., Kokkoris M., Konovalov V., Krtička M., Kroll J., Kurtulgil D., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Naour C. Le, Lerendegui-Marco J., Leong L.S., Licata M., Meo S. Lo, Lonsdale S.J., Losito R., Lozano M., Macina D., Manousos A., Marganiec J., Martinez T., Marrone S., Masi A., Massimi C., Mastinu P., Mastromarco M., Matteucci F., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Montesano S., Moreau C., Mosconi M., Musumarra A., Negret A., Nolte R., O’Brien S., Oprea A., Palomo-Pinto F.R., Pancin J., Paradela C., Patronis N., Pavlik A., Pavlopoulos P., Perkowski J., Perrot L., Pigni M.T., Plag R., Plompen A., Plukis L., Poch A., Porras I., Praena J., Pretel C., Quesada J.M., Radeck D., Rajeev K., Rauscher T., Reifarth R., Riego A., Robles M., Roman F., Rout P.C., Rudolf G., Rubbia C., Rullhusen P., Ryan J.A., Sabaté-Gilarte M., Salgado J., Santos C., Sarchiapone L., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Stephan C., Suryanarayana S.V., Tagliente G., Tain J.L., Tarifeño-Saldivia A., Tarrío D., Tassan-Got L., Tavora L., Terlizzi R., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Villamarin D., Vicente M.C., Vlachoudis V., Vlastou R., Voss F., Wallner A., Walter S., Ware T., Warren S., Weigand M., Weiß C., Wolf C., Wiesher M., Wisshak K., Woods P.J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The n_TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the CERN open data policy, the n_TOF Collaboration takes actions to preserve its unique data, facilitate access to them in standardised format, and allow their re-use by a wide community in the fields of nuclear physics, nuclear astrophysics and various nuclear technologies. The present contribution briefly describes the n_TOF outcomes, as well as the status of dissemination and preservation of n_TOF final data in the international EXFOR library.

Published
2017
Full Text
View/download PDF

8. The 236U neutron capture cross-section measured at the n_TOF CERN facility

Author

Mastromarco M., Barbagallo M., Vermeulen M.J., Colonna N., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Bosnar D., Brugger M., Calviño F., Calviani M., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Durán I., Dzysiuk N., Eleftheriadis C., Ferrari A., Fraval K., Furman V., Gómez-Hornillos M.B., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González E., Goverdovski A., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Heftrich T., Heinitz S., Hernández-Prieto A., Heyse J., Jenkins D.G., Jericha E., Käppeler F., Kadi Y., Karadimos D., Katabuchi T., Ketlerov V., Khryachkov V., Koehler P., Kokkoris M., Kroll J., Krtička M., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Lerendegui-Marco J., Licata M., Losito R., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Paradela C., Pavlik A., Perkowski J., Plompen A.J.M., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego-Perez A., Robles M., Roman F., Rubbia C., Ryan J.A., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Tagliente G., Tain J.L., Tarifeño-Saldivia A., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiss C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The 236U isotope plays an important role in nuclear systems, both for future and currently operating ones. The actual knowledge of the capture reaction of this isotope is satisfactory in the thermal region, but it is considered insufficient for Fast Reactor and ADS applications. For this reason the 236U(n, γ) reaction cross-section has been measured for the first time in the whole energy region from thermal energy up to 1 MeV at the n_TOF facility with two different detection systems: an array of C6D6 detectors, employing the total energy deposited method, and a FX1 total absorption calorimeter (TAC), made of 40 BaF2 crystals. The two n_TOF data sets agree with each other within the statistical uncertainty in the Resolved Resonance Region up to 800 eV, while sizable differences (up to ≃ 20%) are found relative to the current evaluated data libraries. Moreover two new resonances have been found in the n_TOF data. In the Unresolved Resonance Region up to 200 keV, the n_TOF results show a reasonable agreement with previous measurements and evaluated data.

Published
2017
Full Text
View/download PDF

9. Semen microbiota are dramatically altered in men with abnormal sperm parameters

Author

Vadim Osadchiy, Andre Belarmino, Reza Kianian, John T. Sigalos, Jacob S. Ancira, Trisha Kanie, Sarah F. Mangum, Craig D. Tipton, Tung-Chin M. Hsieh, Jesse N. Mills, and Sriram V. Eleswarapu

Subjects
Medicine, Science
Abstract

Abstract There has recently been an explosion of studies implicating the human microbiome in playing a critical role in many disease and wellness states. The etiology of abnormal semen analysis (SA) parameters is not identified in 30% of cases; investigations involving the semen microbiome may bridge this gap. Here, we explore the relationship between the semen microbiome and alterations of sperm parameters. We recruited men presenting for fertility evaluation or vasectomy consultation with proven biological paternity. SA and next generation sequencing was performed. Differential abundance testing using Analysis of composition of Microbiota with Bias Correction (ANCOM-BC) was performed along with canonical correlational analysis for microbial community profiling. Men with abnormal (N = 27) sperm motility showed a higher abundance of Lactobacillus iners compared to those with normal (N = 46) sperm motility (mean proportion 9.4% versus 2.6%, p = 0.046). This relationship persisted on canonical correlational analysis (r = 0.392, p = 0.011). Men with abnormal sperm concentration (N = 20) showed a higher abundance of Pseudomonas stutzeri (2.1% versus 1.0%, p = 0.024) and Pseudomonas fluorescens (0.9% versus 0.7%, p = 0.010), but a lower abundance of Pseudomonas putida (0.5% versus 0.8%, p = 0.020), compared to those with normal sperm concentration (N = 53). Major limitations are related to study design (cross-sectional, observational). Our results suggest that a small group of microorganisms may play a critical role in observed perturbations of SA parameters. Some of these microbes, most notably Lactobacillus iners, have been described extensively within other, fertility-related, contexts, whereas for others, this is the first report where they have potentially been implicated. Advances in our understanding of the semen microbiome may contribute to potentially new therapeutic avenues for correcting impairments in sperm parameters and improving male fertility.

Published
2024
Full Text
View/download PDF

10. Fission Fragment Angular Distribution measurements of 235U and 238U at CERN n_TOF facility

Author

Leal-Cidoncha E., Durán I., Paradela C., Tarrío D., Leong L.S., Tassan-Got L., Audouin L., Altstadt S., Andrzejewski J., Barbagallo M., Bécares V., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Dzysiuk N., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gómez-Hornillos M.B., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Koehler P., Kokkoris M., Krtička M., Kroll J., Lampoudis C., Langer C., Lederer C., Leeb H., Lo Meo S., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P.F., Mastromarco M., Meaze M., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Robles M.S., Roman F., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Neutron-induced fission cross sections of 238U and 235U are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection effciency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process. In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new 235U(n,f) and 238U(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.

Published
2016
Full Text
View/download PDF

11. Towards the high-accuracy determination of the 238U fission cross section at the threshold region at CERN – n_TOF

Author

Diakaki M., Audouin L., Berthoumieux E., Calviani M., Colonna N., Dupont E., Duran I., Gunsing F., Leal-Cidoncha E., Le Naour C., Leong L.S., Mastromarco M., Paradela C., Tarrio D., Tassan-Got L., Aerts G., Altstadt S., Alvarez H., Alvarez-Velarde F., Andriamonje S., Andrzejewski J., Badurek G., Barbagallo M., Baumann P., Becares V., Becvar F., Belloni F., Berthier B., Billowes J., Boccone V., Bosnar D., Brugger M., Calvino F., Cano-Ott D., Capote R., Carrapiço C., Cennini P., Cerutti F., Chiaveri E., Chin M., Cortes G., Cortes-Giraldo M.A., Cosentino L., Couture A., Cox J., David S., Dillmann I., Domingo-Pardo C., Dressler R., Dridi W., Eleftheriadis C., Embid-Segura M., Ferrant L., Ferrari A., Finocchiaro P., Fraval K., Fujii K., Furman W., Ganesan S., Garcia A.R., Giubrone G., Gomez-Hornillos M.B., Goncalves I.F., Gonzalez-Romero E., Goverdovski A., Gramegna F., Griesmayer E., Guerrero C., Gurusamy P., Haight R., Heil M., Heinitz S., Igashira M., Isaev S., Jenkins D.G., Jericha E., Kadi Y., Kaeppeler F., Karadimos D., Karamanis D., Kerveno M., Ketlerov V., Kivel N., Kokkoris M., Konovalov V., Krticka M., Kroll J., Lampoudis C., Langer C., Lederer C., Leeb H., Lo Meo S., Losito R., Lozano M., Manousos A., Marganiec J., Martinez T., Marrone S., Massimi C., Mastinu P., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondelaers W., Moreau C., Mosconi M., Musumarra A., O’Brien S., Pancin J., Patronis N., Pavlik A., Pavlopoulos P., Perkowski J., Perrot L., Pigni M.T., Plag R., Plompen A., Plukis L., Poch A., Pretel C., Praena J., Quesada J., Rauscher T., Reifarth R., Riego A., Roman F., Rudolf G., Rubbia C., Rullhusen P., Salgado J., Santos C., Sarchiapone L., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Stephan C., Tagliente G., Tain J.L., Tavora L., Terlizzi R., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Villamarin D., Vincente M.C., Vlachoudis V., Vlastou R., Voss F., Wallner A., Walter S., Ware T., Weigand M., Weiß C., Wiesher M., Wisshak K., Wright T., and Zugec P.

Subjects
Physics, QC1-999
Abstract

The 238U fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The 238U fission cross section has been measured relative to the 235U fission cross section at CERN – n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards.

Published
2016
Full Text
View/download PDF

12. Experimental neutron capture data of 58Ni from the CERN n_TOF facility

Author

Žugec P., Barbagallo M., Colonna N., Bosnar D., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Duran I., Dzysiuk N., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gómez-Hornillos M.B., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Heinitz S., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Koehler P., Kokkoris M., Krtička M., Kroll J., Langer C., Lederer C., Leeb H., Leong L.S., Lo Meo S., Losito R., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P.F., Mastromarco M., Meaze M., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondalaers W., Paradela C., Pavlik A., Perkowski J., Pignatari M., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riegov A., Roman F., Rubbia C., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., and Wright T.

Subjects
Physics, QC1-999
Abstract

The neutron capture cross section of 58Ni was measured at the neutron time of flight facility n_TOF at CERN, from 27 meV to 400 keV neutron energy. Special care has been taken to identify all the possible sources of background, with the so-called neutron background obtained for the first time using high-precision GEANT4 simulations. The energy range up to 122 keV was treated as the resolved resonance region, where 51 resonances were identified and analyzed by a multilevel R-matrix code SAMMY. Above 122 keV the code SESH was used in analyzing the unresolved resonance region of the capture yield. Maxwellian averaged cross sections were calculated in the temperature range of kT = 5 – 100 keV, and their astrophysical implications were investigated.

Published
2015
Full Text
View/download PDF

14. The nucleosynthesis of heavy elements in Stars: the key isotope 25Mg

Author

Massimi C., Koehler P., Kopecky S., Mingrone F., Schillebeeckx P., Vannini G., Altstadt S., Andrzejewski J., Audouin L., Barbagallo M., Bécares V., Bečvář F., Belloni F, Berthoumieux E., Billowes J., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Duran I., Dressler R., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Krtička M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Mastinu P.F., Mastromarco M., Mendoza E., Mengoni A., Milazzo P.M., Mirea M., Mondalaers W., Paradela C., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Robles M.S., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

We have measured the radiative neutron-capture cross section and the total neutron-induced cross section of one of the most important isotopes for the s process, the 25Mg. The measurements have been carried out at the neutron time-of-flight facilities n_TOF at CERN (Switzerland) and GELINA installed at the EC-JRC-IRMM (Belgium). The cross sections as a function of neutron energy have been measured up to approximately 300 keV, covering the energy region of interest to the s process. The data analysis is ongoing and preliminary results show the potential relevance for the s process.

Published
2014
Full Text
View/download PDF

15. 238U(n, γ) reaction cross section measurement with C6D6 detectors at the n_TOF CERN facility.

Author

Mingrone F., Massimi C., Vannini G., Altstadt S., Andrzejewski J., Audouin L., Barbagallo M., Bécares V., Bečvář F., Belloni F, Berthoumieux E., Billowes J., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Duran I., Dressler R., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Koehler P., Krtička M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Losito R., Mallick A., Manousos A., Marganiec J., Martínez T., Mastinu P.F., Mastromarco M., Mendoza E., Mengoni A., Milazzo P.M., Mirea M., Mondalaers W., Paradela C., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Robles M.S., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The radiative capture cross section of 238U is very important for the developing of new reactor technologies and the safety of existing ones. Here the preliminary results of the 238U(n,γ) cross section measurement performed at n_TOF with C6D6 scintillation detectors are presented, paying particular attention to data reduction and background subtraction.

Published
2014
Full Text
View/download PDF

16. Measurements of neutron cross sections for advanced nuclear energy systems at n_TOF (CERN)

Author

Barbagallo M., Colonna N., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Bečvář F., Belloni F, Berthoumieux E., Billowes J., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Duran I., Dressler R., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Koehler P., Krtička M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Losito R., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P.F., Mastromarco M., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondalaers W., Paradela C., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The n_TOF facility operates at CERN with the aim of addressing the request of high accuracy nuclear data for advanced nuclear energy systems as well as for nuclear astrophysics. Thanks to the features of the neutron beam, important results have been obtained on neutron induced fission and capture cross sections of U, Pu and minor actinides. Recently the construction of another beam line has started; the new line will be complementary to the first one, allowing to further extend the experimental program foreseen for next measurement campaigns.

Published
2014
Full Text
View/download PDF

17. Neutron cross-sections for advanced nuclear systems: the n_TOF project at CERN

Author

Barbagallo M., Mastromarco M., Colonna N., Altstadt S., Andrzejewski J., Audouin L., Bécares V., Bečvář F., Belloni F, Berthoumieux E., Billowes J., Bosnar D., Brugger M., Calviani M., Calviño F., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Duran I., Dressler R., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gonçalves I.F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Hernández-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Käppeler F., Karadimos D., Kivel N., Koehler P., Krtička M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Losito R., Manousos A., Marganiec J., Martínez T., Massimi C., Mastinu P.F., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondalaers W., Paradela C., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Rubbia C., Sabaté-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Tagliente G., Tain J.L., Tarrío D., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vermeulen M.J., Vlachoudis V., Vlastou R., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The study of neutron-induced reactions is of high relevance in a wide variety of fields, ranging from stellar nucleosynthesis and fundamental nuclear physics to applications of nuclear technology. In nuclear energy, high accuracy neutron data are needed for the development of Generation IV fast reactors and accelerator driven systems, these last aimed specifically at nuclear waste incineration, as well as for research on innovative fuel cycles. In this context, a high luminosity Neutron Time Of Flight facility, n_TOF, is operating at CERN since more than a decade, with the aim of providing new, high accuracy and high resolution neutron cross-sections. Thanks to the features of the neutron beam, a rich experimental program relevant to nuclear technology has been carried out so far. The program will be further expanded in the near future, thanks in particular to a new high-flux experimental area, now under construction.

Published
2014
Full Text
View/download PDF

18. Angular distribution in the neutron-induced fission of actinides

Author

Leong L.S., Tassan-Got L., Tarrio D., Audouin L., Paradela C., Duran I., Le Naour C., Altstadt S., Andrzejewsky J., Barbagallo M., Bécares V., Bečvář F., Belloni F., Berthoumieux E., Billowes J., Boccone V., Bosnar D., Brugger M., Calvino F., Calviani M., Cano-Ott D., Carrapiço C., Cerutti F., Chiaveri E., Chin M., Colonna N., Cortés G., Cortés-Giraldo M.A., Diakaki M., Domingo-Pardo C., Dressler R., Dzysiuk N., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., García A.R., Giubrone G., Gómez-Hornillos M.B., Gonçalves I.F., González-Romero, Griesmayer E., Guerrero C., Gunsing F., Gurusamy P., Jenkins D.G., Jericha E., Kadi E., Käppeler F., Karadimos D., Kivel N., Koehler P., Kokkoris M., Korschinek G., Kroll J., Krtička M., Langer C., Lederer C., Leeb H., Losito R., Manousos A., Marganiec J., Massimi C., Martínez T., Mastinu P.F., Mastromarco M., Meaze M., Mengon A., Mendoza E., Milazzo P.M., Mingrone T., Mirea M., Mondelaers W., Pavlik A., Perkowski J., Pignatari M., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifhart R., Riego A., Roman F., Rubbia C., Sarmento R., Schillebeeckx P., Schmidt S., Schumann D., Taín J.L., Tagliente G., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Vlachoudis V., Vlastou V., Wallner A., Ware T., Weigand M., Weiß C., Wright T., and Zǔgec

Subjects
Physics, QC1-999
Abstract

Above 1 MeV of incident neutron energy the fission fragment angular distribution (FFAD) has generally a strong anisotropic behavior due to the combination of the incident orbital momentum and the intrinsic spin of the fissioning nucleus. This effect has to be taken into account for the efficiency estimation of devices used for fission cross section measurements. In addition it bears information on the spin deposition mechanism and on the structure of transitional states. We designed and constructed a detection device, based on Parallel Plate Avalanche Counters (PPAC), for measuring the fission fragment angular distributions of several isotopes, in particular 232Th. The measurement has been performed at n_TOF at CERN taking advantage of the very broad energy spectrum of the neutron beam. Fission events were recognized by back to back detection in coincidence in two position-sensitive detectors surrounding the targets. The detection efficiency, depending mostly on the stopping of fission fragments in backings and electrodes, has been computed with a Geant4 simulation and validated by the comparison to the measured case of 235U below 3 keV where the emission is isotropic. In the case of 232Th, the result is in good agreement with previous data below 10 MeV, with a good reproduction of the structures associated to vibrational states and the opening of second chance fission. In the 14 MeV region our data are much more accurate than previous ones which are broadly scattered.

Published
2013
Full Text
View/download PDF

19. Present status and future programs of the n_TOF experiment

Author

Wright T.J., Ware T., Vlastou R., Wallner A., Vermeulen M.J., Versaci R., Vaz P., Ventura A., Valenta S., Vannini G., Variale V., Tassan-Got L., Tsinganis A., Tain J.L., Tarrio D., Sarmento R., Tagliente G., Roman F., Rubbia C., Reifarth R., Riego A., Rauscher T., Quesada J.M., Perkowski J., Praena J., Paradela C., Pavlik A., Mirea M., Mengoni A., Milazzo P.M., Mendoza E., Meaze M., Mastromarco M., Mastinu P.F., Martinez T., Massimi C., Manousos A., Marganiec J., Lozano M., Losito R., Leong L.S., Lederer C., Leeb H., Krtička M., Kroll J., Karadimos D., Kokkoris M., Käppeler F., Kadi Y., Jenkins D.G., Jericha E., Guerrero C., Gunsing F., Heil M., Griesmayer E., González-Romero E., Gramegna F., Gonçalves I.F., Gómez-Hornillos M.B., Giubrone G., Ganesan S., Fraval K., Fernández-Ordóñez M., Ferrari A., Dzysiuk N., Eleftheriadis C., Duran I., Dillmann I., Domingo-Pardo C., Diakaki M., Cortés-Giraldo M.A., Cortés G., Colonna N., Chin M., Carrapiço C., Cerutti F., Calviño F., Cano-Ott D., Brugger M., Billowes J., Boccone V., Berthoumieux E., Belloni F., Barbagallo M., Bécares V., Beĉvář F., Avrigeanu F., Andrzejewski J., Audouin L., Weis C., Andriamonje S., Vlachoudis V., Calviani M., and Chiaveri E.

Subjects
Physics, QC1-999
Abstract

The neutron time-of-flight facility n_TOF at CERN, Switzerland, operational since 2001, delivers neutrons using the Proton Synchrotron (PS) 20 GeV/c proton beam impinging on a lead spallation target. The facility combines a very high instantaneous neutron flux, an excellent time of flight resolution due to the distance between the experimental area and the production target (185 meters), a low intrinsic background and a wide range of neutron energies, from thermal to GeV neutrons. These characteristics provide a unique possibility to perform neutron-induced capture and fission cross-section measurements for applications in nuclear astrophysics and in nuclear reactor technology. The most relevant measurements performed up to now and foreseen for the future will be presented in this contribution. The overall efficiency of the experimental program and the range of possible measurements achievable with the construction of a second experimental area (EAR-2), vertically located 20 m on top of the n_TOF spallation target, might offer a substantial improvement in measurement sensitivities. A feasibility study of the possible realisation of the installation extension will be also presented.

Published
2012
Full Text
View/download PDF

20. PD53-05 CRITICAL DIFFERENCES IN SEMEN AND URINE MICROBIOME MANIFEST IN MEN WITH ABNORMAL SPERM PARAMETERS

Author

Osadchiy, Vadim, primary, Belarmino, Andre, additional, Kianian, Reza, additional, Sigalos, John T., additional, Furtado, Thiago P., additional, Ancira, Jacob S., additional, Kanie, Trisha, additional, Magnum, Sarah F., additional, Tipton, Craig D., additional, Hsieh, Tung-Chin M., additional, Mills, Jesse N., additional, and Eleswarapu, Sriram V., additional

Published
2024
Full Text
View/download PDF

21. One size does not fit all: variations by ethnicity in demographic characteristics of men seeking fertility treatment across North America

Author

Chen, Andrew B., Jarvi, Keith A., Lajkosz, Katherine, Smith, James F., Lo, Kirk C., Grober, Ethan D., Lau, Susan, Bieniek, Jared M., Brannigan, Robert E., Chow, Victor D.W., Domes, Trustin, Dupree, James M., Goldstein, Marc, Hedges, Jason C., Hotaling, James M., Ko, Edmund Y., Kolettis, Peter N., Nangia, Ajay K., Sandlow, Jay I., Shin, David, Spitz, Aaron, Trussell, J.C., Zeitlin, Scott I., Zini, Armand S., Fisher, Marc A., Walsh, Thomas J., Hsieh, Tung-Chin M., Fuchs, Eugene F., and Samplaski, Mary K.

Published
2021
Full Text
View/download PDF

22. Neutron capture cross section measurement of 238U at the n TOF CERN facility with C6D6 scintillation detectors in the energy region from 1 eV to 700 keV

Author

Collaboration, n_TOF, Mingrone, F., Massimi, C., Vannini, G., Colonna, N., Gunsing, F., Žugec, P., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Hernández-Prieto, A., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Krtička, 1 M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L. S., Meo, S. Lo, Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P. F., Mastromarco, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Robles, M. S., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Variale, V., Vaz, P., Ventura, A., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., and Wright, T.

Subjects
Nuclear Experiment
Abstract

The aim of this work is to provide a precise and accurate measurement of the 238U(n,g) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundamental importance for the design calculations of nuclear reactors, governing the behaviour of the reactor core. In particular, fast reactors, which are experiencing a growing interest for their ability to burn radioactive waste, operate in the high energy region of the neutron spectrum. In this energy region most recent evaluations disagree due to inconsistencies in the existing measurements of up to 15%. In addition, the assessment of nuclear data uncertainty performed for innovative reactor systems shows that the uncertainty in the radiative capture cross-section of 238U should be further reduced to 1-3% in the energy region from 20 eV to 25 keV. To this purpose, addressed by the Nuclear Energy Agency as a priority nuclear data need, complementary experiments, one at the GELINA and two at the n_TOF facility, were proposed and carried out within the 7th Framework Project ANDES of the European Commission. The results of one of these 238U(n,g) measurements performed at the n_TOF CERN facility are presented in this work. The gamma-ray cascade following the radiative neutron capture has been detected exploiting a setup of two C6D6 liquid scintillators. Resonance parameters obtained from this work are on average in excellent agreement with the ones reported in evaluated libraries. In the unresolved resonance region, this work yields a cross section in agreement with evaluated libraries up to 80 keV, while for higher energies our results are significantly higher., Comment: 15 pages, 10 captioned figures

Published
2016
Full Text
View/download PDF

23. Engineering the structural and electronic phases of MoTe2 through W substitution

Author

Rhodes, D., Chenet, D. A., Janicek, B. E., Nyby, C., Lin, Y., Jin, W., Edelberg, D., Mannebach, E., Finney, N., Antony, A., Schiros, T., Klarr, T., Mazzoni, A., Chin, M., Chiu, Y. -c, Zheng, W., Zhang, Q. R., Ernst, F., Dadap, J. I., Tong, X., Ma, J., Lou, R., Wang, S., Qian, T., Ding, H., Osgood Jr, R. M., Paley, D. W., Lindenberg, A. M., Huang, P. Y., Pasupathy, A. N., Dubey, M., Hone, J., and Balicas, L.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

MoTe$_2$ is an exfoliable transition metal dichalcogenide (TMD) which crystallizes in three symmetries, the semiconducting trigonal-prismatic $2H-$phase, the semimetallic $1T^{\prime}$ monoclinic phase, and the semimetallic orthorhombic $T_d$ structure. The $2H-$phase displays a band gap of $\sim 1$ eV making it appealing for flexible and transparent optoelectronics. The $T_d-$phase is predicted to possess unique topological properties which might lead to topologically protected non-dissipative transport channels. Recently, it was argued that it is possible to locally induce phase-transformations in TMDs, through chemical doping, local heating, or electric-field to achieve ohmic contacts or to induce useful functionalities such as electronic phase-change memory elements. The combination of semiconducting and topological elements based upon the same compound, might produce a new generation of high performance, low dissipation optoelectronic elements. Here, we show that it is possible to engineer the phases of MoTe$_2$ through W substitution by unveiling the phase-diagram of the Mo$_{1-x}$W$_x$Te$_2$ solid solution which displays a semiconducting to semimetallic transition as a function of $x$. We find that only $\sim 8$ \% of W stabilizes the $T_d-$phase at room temperature. Photoemission spectroscopy, indicates that this phase possesses a Fermi surface akin to that of WTe$_2$., Comment: 10 paged, 5 pages, supplementary information not included

Published
2016
Full Text
View/download PDF

24. Integral measurement of the $^{12}$C(n,p)$^{12}$B reaction up to 10 GeV

Author

Žugec, P., Colonna, N., Bosnar, D., Ventura, A., Mengoni, A., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., Eleftheriadis, C., Ferrari, A., Finocchiaro, P., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Käppeler, F., Karadimos, D., Kivel, N., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Meo, S. Lo, Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mastromarco, M., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Musumarra, A., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., and Wright, T.

Subjects
Nuclear Experiment
Abstract

The integral measurement of the $^{12}$C(n,p)$^{12}$B reaction was performed at the neutron time of flight facility n_TOF at CERN. The total number of $^{12}$B nuclei produced per neutron pulse of the n_TOF beam was determined using the activation technique in combination with a time of flight technique. The cross section is integrated over the n_TOF neutron energy spectrum from reaction threshold at 13.6 MeV to 10 GeV. Having been measured up to 1 GeV on basis of the $^{235}$U(n,f) reaction, the neutron energy spectrum above 200 MeV has been reevaluated due to the recent extension of the cross section reference for this particular reaction, which is otherwise considered a standard up to 200 MeV. The results from the dedicated GEANT4 simulations have been used to evaluate the neutron flux from 1 GeV up to 10 GeV. The experimental results related to the $^{12}$C(n,p)$^{12}$B reaction are compared with the evaluated cross sections from major libraries and with the predictions of different GEANT4 models, which mostly underestimate the $^{12}$B production. On the contrary, a good reproduction of the integral cross section derived from measurements is obtained with TALYS-1.6 calculations, with optimized parameters., Comment: 14 pages, 11 figures, 3 tables

Published
2016
Full Text
View/download PDF

25. Zebrafish tsc1 and cxcl12a increase susceptibility to mycobacterial infection.

Author

Wright, K, Han, DJ, Song, R, de Silva, K, Plain, KM, Purdie, AC, Shepherd, A, Chin, M, Hortle, E, Wong, JJ-L, Britton, WJ, Oehlers, SH, Wright, K, Han, DJ, Song, R, de Silva, K, Plain, KM, Purdie, AC, Shepherd, A, Chin, M, Hortle, E, Wong, JJ-L, Britton, WJ, and Oehlers, SH

Abstract

Regulation of host miRNA expression is a contested node that controls the host immune response to mycobacterial infection. The host must counter subversive efforts of pathogenic mycobacteria to launch a protective immune response. Here, we examine the role of miR-126 in the zebrafish-Mycobacterium marinum infection model and identify a protective role for infection-induced miR-126 through multiple effector pathways. We identified a putative link between miR-126 and the tsc1a and cxcl12a/ccl2/ccr2 signalling axes resulting in the suppression of non-tnfa expressing macrophage accumulation at early M. marinum granulomas. Mechanistically, we found a detrimental effect of tsc1a expression that renders zebrafish embryos susceptible to higher bacterial burden and increased cell death via mTOR inhibition. We found that macrophage recruitment driven by the cxcl12a/ccl2/ccr2 signalling axis was at the expense of the recruitment of classically activated tnfa-expressing macrophages and increased cell death around granulomas. Together, our results delineate putative pathways by which infection-induced miR-126 may shape an effective immune response to M. marinum infection in zebrafish embryos.

Published
2024

26. Supportive care 2030 movement: towards unifying ambitions for global excellence in supportive cancer care—an international Delphi study

Author

Chan, R, Knowles, R, Ashbury, F, Bowen, J, Chan, A, Chin, M, Olver, I, Taylor, C, Tinianov, S, Alberti, P, Bossi, P, Brito-Dellan, N, Cooksley, T, Crawford, G, Dixit, N, Fitch, M, Freedman, J, Ginex, P, Hart, N, Hertz, D, Jefford, M, Koczwara, B, Naito, T, Orsey, A, Ruhlmann, C, Tsoukalas, N, van den Hurk, C, Van Sebille, Y, Wardill, H, Scotte, F, Lustberg, M, Chan, Raymond Javan, Knowles, Reegan, Ashbury, Fredrick D., Bowen, Joanne, Chan, Alexandre, Chin, Melissa, Olver, Ian, Taylor, Carolyn, Tinianov, Stacey, Alberti, Paola, Bossi, Paolo, Brito-Dellan, Norman, Cooksley, Tim, Crawford, Gregory Brian, Dixit, Niharika, Fitch, Margaret I., Freedman, Jason L., Ginex, Pamela K., Hart, Nicolas H., Hertz, Daniel L., Jefford, Michael, Koczwara, Bogda, Naito, Tateaki, Orsey, Andrea Dahlman, Ruhlmann, Christina H., Tsoukalas, Nikolaos, van den Hurk, Corina, Van Sebille, Ysabella, Wardill, Hannah Rose, Scotte, Florian, Lustberg, Maryam, Chan, R, Knowles, R, Ashbury, F, Bowen, J, Chan, A, Chin, M, Olver, I, Taylor, C, Tinianov, S, Alberti, P, Bossi, P, Brito-Dellan, N, Cooksley, T, Crawford, G, Dixit, N, Fitch, M, Freedman, J, Ginex, P, Hart, N, Hertz, D, Jefford, M, Koczwara, B, Naito, T, Orsey, A, Ruhlmann, C, Tsoukalas, N, van den Hurk, C, Van Sebille, Y, Wardill, H, Scotte, F, Lustberg, M, Chan, Raymond Javan, Knowles, Reegan, Ashbury, Fredrick D., Bowen, Joanne, Chan, Alexandre, Chin, Melissa, Olver, Ian, Taylor, Carolyn, Tinianov, Stacey, Alberti, Paola, Bossi, Paolo, Brito-Dellan, Norman, Cooksley, Tim, Crawford, Gregory Brian, Dixit, Niharika, Fitch, Margaret I., Freedman, Jason L., Ginex, Pamela K., Hart, Nicolas H., Hertz, Daniel L., Jefford, Michael, Koczwara, Bogda, Naito, Tateaki, Orsey, Andrea Dahlman, Ruhlmann, Christina H., Tsoukalas, Nikolaos, van den Hurk, Corina, Van Sebille, Ysabella, Wardill, Hannah Rose, Scotte, Florian, and Lustberg, Maryam

Abstract

Background Supportive care to ensure optimal quality of life is an essential component of cancer care and symptom control across the lifespan. Ongoing advances in cancer treatment, increasing toxicity from many novel treatment regimes, and variations in access to care and cancer outcomes across the globe and resource settings present significant challenges for supportive care delivery. To date, no overarching framework has been developed to guide supportive care development worldwide. As an initial step of the Multinational Association of Supportive Care in Cancer (MASCC) Supportive Care 2030 Movement, we developed a targeted, unifying set of ambition statements to envision the future of supportive cancer care. Methods From September 2022 until June 2023, we used a modified Delphi methodology to develop and attain consensus about ambition statements related to supportive cancer care. Leaders of MASCC Study Groups were invited to participate in an Expert Panel for the first two Delphi rounds (and a preliminary round to suggest potential ambition statements). Patient Advocates then examined and provided input regarding the ambition statements. Findings Twenty-seven Expert Panelists and 11 Patient Advocates participated. Consensus was attained on 13 ambition statements, with two sub-statements. The ambition statements addressed global standards for guideline development and implementation, coordinated and individualized care, dedicated supportive oncology services, self-management, needs for screening and actions, patient education, behavioral support, financial impact minimization, comprehensive survivorship care, and timely palliative care, reflecting collaboration, coordination and team-based approach across all levels. Interpretation This study is the first to develop shared ambitions for the future of supportive cancer care on a global level. These ambition statements can facilitate a coordinated, resource-stratified, and person-centered approach and inform resear

Published
2024

27. High accuracy determination of the $^{238}$U/$^{235}$U fission cross section ratio up to $\sim$1 GeV at n_TOF (CERN)

Author

Paradela, C., Calviani, M., Tarrío, D., Leal-Cidoncha, E., Leong, L. S., Tassan-Got, L., Naour, C. Le, Duran, I., Colonna, N., Audouin, L., Mastromarco, M., Meo, S. Lo, Ventura, A., Altstadt, S., Andrzejewski, J., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Diakaki, M., Domingo-Pardo, C., Dressler, R., Eleftheriadis, C., Ferrari, A., Finocchiaro, P., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Käppeler, F., Karadimos, D., Kivel, N., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Musumarra, A., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.

Subjects
Nuclear Experiment
Abstract

The $^{238}$U to $^{235}$U fission cross section ratio has been determined at n_TOF up to $\sim$1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets have been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of the neutron energy. The result confirms current evaluations up to 200 MeV. A good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solving a long-standing discrepancy between the two most important experimental dataset available so far above 20 MeV, while extending the neutron energy range for the first time up to $\sim$1 GeV.

Published
2014
Full Text
View/download PDF

28. Measurement of the $^{12}$C($n,p$)$^{12}$B cross section at n_TOF (CERN) by in-beam activation analysis

Author

Žugec, P., Colonna, N., Bosnar, D., Mengoni, A., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Cano-Ott, F. Calviño D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., Eleftheriadis, C., Ferrari, A., Finocchiaro, P., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Käppeler, F., Karadimos, D., Kivel, N., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., LoMeo, S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mastromarco, M., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Musumarra, A., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., and Wright, T.

Subjects
Nuclear Experiment
Abstract

The integral cross section of the $^{12}$C($n,p$)$^{12}$B reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n_TOF facility at CERN. The measurement relies on the activation technique, with the $\beta$-decay of $^{12}$B measured over a period of four half-lives within the same neutron bunch in which the reaction occurs. The results indicate that model predictions, used in a variety of applications, are mostly inadequate. The value of the integral cross section reported here can be used as a benchmark for verifying or tuning model calculations., Comment: 6 pages, 4 figures

Published
2014
Full Text
View/download PDF

29. GEANT4 simulation of the neutron background of the C$_6$D$_6$ set-up for capture studies at n_TOF

Author

collaboration, n_TOF, Žugec, P., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Meo, S. Lo, Losito, R., Manousos, A., Marganiec, J., Martìnez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., and Wright, T.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The neutron sensitivity of the C$_6$D$_6$ detector setup used at n_TOF for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has been implemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with a $^\mathrm{nat}$C sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured $^\mathrm{nat}$C yield has been discovered, which prevents the use of $^\mathrm{nat}$C data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross section measurements.

Published
2014
Full Text
View/download PDF

30. $^{62}$Ni($n,\gamma$) and $^{63}$Ni($n,\gamma$) cross sections measured at n_TOF/CERN

Author

Lederer, C., Massimi, C., Berthoumieux, E., Colonna, N., Dressler, R., Guerrero, C., Gunsing, F., Käppeler, F., Kivel, N., Pignatari, M., Reifarth, R., Schumann, D., Wallner, A., Altstadt, S., Andriamonje, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Becares, V., Becvar, F., Belloni, F., Berthier, B., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calvino, F., Cano-Ott, D., Carrapico, C., Cerutti, F., Chiaveri, E., Chin, M., Cortes, G., Cortes-Giraldo, M. A., Dillmann, I., Domingo-Pardo, C., Duran, I., Dzysiuk, N., Eleftheriadis, C., Fernandez-Ordonez, M., Ferrari, A., Fraval, K., Ganesan, S., Garcıa, A. R., Giubrone, G., Gomez-Hornillos, M. B., Goncalves, I. F., Gonzalez-Romero, E., Gramegna, F., Griesmayer, E., Gurusamy, P., Harrisopulos, S., Heil, M., Ioannides, K., Jenkins, D. G., Jericha, E., Kadi, Y., Karadimos, D., Korschinek, G., Krticka, M., Kroll, J., Langer, C., Lebbos, E., Leeb, H., Leong, L. S., Losito, R., Lozano, M., Manousos, A., Marganiec, J., Marrone, S., Martinez, T., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plag, R., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Tagliente, G., Tain, J. L., Tarrıo, D., Tassan-Got, L., Tsinganis, A., Tlustos, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vermeulen, M. J., Versaci, R., Vlachoudis, V., Vlastou, R., Ware, T., Weigand, M., Weiß, C., Wright, T. J., and Zugec, P.

Subjects
Nuclear Experiment
Abstract

The cross section of the $^{62}$Ni($n,\gamma$) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200~keV neutron energy and Maxwellian averaged cross sections (MACS) from $kT=5-100$ keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at $kT=30$ keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the $^{63}$Ni($n,\gamma$) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on $s$-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.

Published
2014
Full Text
View/download PDF

31. Experimental neutron capture data of $^{58}$Ni from the CERN n_TOF facility

Author

collaboration, n_TOF, Žugec, P., Barbagallo, M., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Koehler, P., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Losito, R., Manousos, A., Marganiec, J., Martìnez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Pignatari, M., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., and Wright, T.

Subjects
Nuclear Experiment
Abstract

The $^{58}$Ni $(n,\gamma)$ cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances have been analyzed up to 122 keV. Maxwellian averaged cross sections (MACS) have been calculated for stellar temperatures of kT$=$5-100 keV with uncertainties of less than 6%, showing fair agreement with recent experimental and evaluated data up to kT = 50 keV. The MACS extracted in the present work at 30 keV is 34.2$\pm$0.6$_\mathrm{stat}\pm$1.8$_\mathrm{sys}$ mb, in agreement with latest results and evaluations, but 12% lower relative to the recent KADoNIS compilation of astrophysical cross sections. When included in models of the s-process nucleosynthesis in massive stars, this change results in a 60% increase of the abundance of $^{58}$Ni, with a negligible propagation on heavier isotopes. The reason is that, using both the old or the new MACS, 58Ni is efficiently depleted by neutron captures., Comment: 10 pages, 8 figures, 5 tables

Published
2014
Full Text
View/download PDF

33. Extended calibration range for prompt photon emission in ion beam irradiation

Author

Bellini, F., Boehlen, T. T., Chin, M. P. W., Collamati, F., De Lucia, E., Faccini, R., Ferrari, A., Lanza, L., Mancini-Terraciano, C., Marafini, M., Mattei, I., Morganti, S., Ortega, P. G., Patera, V., Piersanti, L., Russomando, A., Sala, P. R., Sarti, A., Sciubba, A., Camillocci, E. Solfaroli, and Voena, C.

Subjects
Physics - Medical Physics, Physics - Instrumentation and Detectors
Abstract

Monitoring the dose delivered during proton and carbon ion therapy is still a matter of research. Among the possible solutions, several exploit the measurement of the single photon emission from nuclear decays induced by the irradiation. To fully characterize such emission the detectors need development, since the energy spectrum spans the range above the MeV that is not traditionally used in medical applications. On the other hand, a deeper understanding of the reactions involving gamma production is needed in order to improve the physic models of Monte Carlo codes, relevant for an accurate prediction of the prompt-gamma energy spectrum.This paper describes a calibration technique tailored for the range of energy of interest and reanalyzes the data of the interaction of a 80MeV/u fully stripped carbon ion beam with a Poly-methyl methacrylate target. By adopting the FLUKA simulation with the appropriate calibration and resolution a significant improvement in the agreement between data and simulation is reported., Comment: 4 pages, 7 figures, Submitted to JINST

Published
2013
Full Text
View/download PDF

34. Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis

Author

Lederer, C., Massimi, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bevá, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Korschinek, G., Krtika, M., Kroll, J., Langer, C., Leeb, H., Leong, L. S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondelaers, W., Paradela, C., Pavlik, A., Perkowski, J., Pignatari, M., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T. J., and Zugec, P.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract

The $^{63}$Ni($n, \gamma$) cross section has been measured for the first time at the neutron time-of-flight facility n\_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian Averaged Cross Sections were calculated for thermal energies from kT = 5 keV to 100 keV with uncertainties around 20%. Stellar model calculations for a 25 M$_\odot$ star show that the new data have a significant effect on the $s$-process production of $^{63}$Cu, $^{64}$Ni, and $^{64}$Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.

Published
2013
Full Text
View/download PDF

35. Reproductive endocrinologists are the gatekeepers for male infertility care in North America: results of a North American survey on the referral patterns and characteristics of men presenting to male infertility specialists for infertility investigations

Author

Samplaski, Mary K., Smith, James F., Lo, Kirk C., Hotaling, James M., Lau, Susan, Grober, Ethan D., Trussell, J.C., Walsh, Thomas J., Kolettis, Peter N., Chow, Victor D.W., Zini, Armand S., Spitz, Aaron, Fischer, Marc A., Domes, Trustin, Zeitlin, Scott I., Fuchs, Eugene F., Hedges, Jason C., Sandlow, Jay I., Brannigan, Robert E., Dupree, James M., Goldstein, Marc, Ko, Edmund Y., Hsieh, Tung-Chin M., Bieniek, Jared M., Shin, David, Nangia, Ajay K., and Jarvi, Keith A.

Published
2019
Full Text
View/download PDF

36. Comparison of contact metals evaporated onto monolayer molybdenum disulfide.

Author

Mazzoni, A., Burke, R., Chin, M., Najmaei, S., Dubey, M., Goldsman, N., and Daniels, K.

Subjects
CHEMICAL vapor deposition, FIELD-effect devices, MONOMOLECULAR films, FIELD-effect transistors, MOLYBDENUM disulfide, MOLYBDENUM sulfides, METALS
Abstract

Understanding and improving the contact resistance of two-dimensional materials for the fabrication of next-generation devices is of vital importance to be able to fully utilize the new physics available in these materials. In this work, eight different contact metals (Ag, Au, Cr, Cu, In, Mo, Ni, and Ti) have been investigated using the same sample of monolayer MoS2. Through the fabrication and testing of multiple, identically sized field-effect transistor devices per contact metal, we compensate for large variability in electrical properties of as-grown chemical vapor deposition MoS2 and deduce the relative performance of each metal. The general trend of lower work function metals having lower contact resistance holds with In, Ag, and Ti performing the best of the metals tested. Our results are compatible with recent research suggesting that the contact resistance in undoped, monolayer MoS2 is dominated by a lateral junction resistance, and we provide context for how this manifests in device-to-device variation. Multiple orders of magnitude differences in contact resistance are observed between metals and can be explained by this lateral barrier operating in the thermionic-field emission regime. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

37. The AeroCom evaluation and intercomparison of organic aerosol in global models

Author

Tsigaridis, K, Daskalakis, N, Kanakidou, M, Adams, PJ, Artaxo, P, Bahadur, R, Balkanski, Y, Bauer, SE, Bellouin, N, Benedetti, A, Bergman, T, Berntsen, TK, Beukes, JP, Bian, H, Carslaw, KS, Chin, M, Curci, G, Diehl, T, Easter, RC, Ghan, SJ, Gong, SL, Hodzic, A, Hoyle, CR, Iversen, T, Jathar, S, Jimenez, JL, Kaiser, JW, Kirkevåg, A, Koch, D, Kokkola, H, Lee, YH, Lin, G, Liu, X, Luo, G, Ma, X, Mann, GW, Mihalopoulos, N, Morcrette, J-J, Müller, J-F, Myhre, G, Myriokefalitakis, S, Ng, NL, O'Donnell, D, Penner, JE, Pozzoli, L, Pringle, KJ, Russell, LM, Schulz, M, Sciare, J, Seland, Ø, Shindell, DT, Sillman, S, Skeie, RB, Spracklen, D, Stavrakou, T, Steenrod, SD, Takemura, T, Tiitta, P, Tilmes, S, Tost, H, van Noije, T, van Zyl, PG, von Salzen, K, Yu, F, Wang, Z, Zaveri, RA, Zhang, H, Zhang, K, Zhang, Q, and Zhang, X

Subjects
Aging, Climate Action, Astronomical and Space Sciences, Atmospheric Sciences, Meteorology & Atmospheric Sciences
Abstract

This paper evaluates the current status of global modeling of the organic aerosol (OA) in the troposphere and analyzes the differences between models as well as between models and observations. Thirty-one global chemistry transport models (CTMs) and general circulation models (GCMs) have participated in this intercomparison, in the framework of AeroCom phase II. The simulation of OA varies greatly between models in terms of the magnitude of primary emissions, secondary OA (SOA) formation, the number of OA species used (2 to 62), the complexity of OA parameterizations (gas-particle partitioning, chemical aging, multiphase chemistry, aerosol microphysics), and the OA physical, chemical and optical properties. The diversity of the global OA simulation results has increased since earlier AeroCom experiments, mainly due to the increasing complexity of the SOA parameterization in models, and the implementation of new, highly uncertain, OA sources. Diversity of over one order of magnitude exists in the modeled vertical distribution of OA concentrations that deserves a dedicated future study. Furthermore, although the OA / OC ratio depends on OA sources and atmospheric processing, and is important for model evaluation against OA and OC observations, it is resolved only by a few global models. The median global primary OA (POA) source strength is 56 Tg a-1 (range 34-144 Tg a-1) and the median SOA source strength (natural and anthropogenic) is 19 Tg a-1 (range 13-121 Tg a-1). Among the models that take into account the semi-volatile SOA nature, the median source is calculated to be 51 Tg a-1 (range 16-121 Tg a-1), much larger than the median value of the models that calculate SOA in a more simplistic way (19 Tg a-1; range 13-20 Tg a-1, with one model at 37 Tg a-1). The median atmospheric burden of OA is 1.4 Tg (24 models in the range of 0.6-2.0 Tg and 4 between 2.0 and 3.8 Tg), with a median OA lifetime of 5.4 days (range 3.8-9.6 days). In models that reported both OA and sulfate burdens, the median value of the OA/sulfate burden ratio is calculated to be 0.77; 13 models calculate a ratio lower than 1, and 9 models higher than 1. For 26 models that reported OA deposition fluxes, the median wet removal is 70 Tg a-1 (range 28-209 Tg a-1), which is on average 85% of the total OA deposition. Fine aerosol organic carbon (OC) and OA observations from continuous monitoring networks and individual field campaigns have been used for model evaluation. At urban locations, the model-observation comparison indicates missing knowledge on anthropogenic OA sources, both strength and seasonality. The combined model-measurements analysis suggests the existence of increased OA levels during summer due to biogenic SOA formation over large areas of the USA that can be of the same order of magnitude as the POA, even at urban locations, and contribute to the measured urban seasonal pattern. Global models are able to simulate the high secondary character of OA observed in the atmosphere as a result of SOA formation and POA aging, although the amount of OA present in the atmosphere remains largely underestimated, with a mean normalized bias (MNB) equal to -0.62 (-0.51) based on the comparison against OC (OA) urban data of all models at the surface, -0.15 (+0.51) when compared with remote measurements, and -0.30 for marine locations with OC data. The mean temporal correlations across all stations are low when compared with OC (OA) measurements: 0.47 (0.52) for urban stations, 0.39 (0.37) for remote stations, and 0.25 for marine stations with OC data. The combination of high (negative) MNB and higher correlation at urban stations when compared with the low MNB and lower correlation at remote sites suggests that knowledge about the processes that govern aerosol processing, transport and removal, on top of their sources, is important at the remote stations. There is no clear change in model skill with increasing model complexity with regard to OC or OA mass concentration. However, the complexity is needed in models in order to distinguish between anthropogenic and natural OA as needed for climate mitigation, and to calculate the impact of OA on climate accurately.

Published
2014

43. 709 Randomized, double-blind, placebo-controlled trial of oral prednisone as adjunctive treatment in pulmonary exacerbations in cystic fibrosis (PIPE Study)

Author

Waters, V., primary, Shaw, M., additional, Quon, B., additional, Tullis, E., additional, Solomon, M., additional, Rayment, J., additional, Lavoie, A., additional, Tse, S., additional, Daigneault, P., additional, Bilodeau, L., additional, Price, A., additional, Nicholson, M., additional, Chin, M., additional, Parkins, M., additional, McKinney, M., additional, Tam, J., additional, Perrem, L., additional, Stanojevic, S., additional, Grasemann, H., additional, and Ratjen, F., additional

Published
2023
Full Text
View/download PDF

44. Roman Power and the Memorial Turn in Civic Honourability in Western Asia Minor, ca 85 BCE-14 CE

Author

Chin, M

Subjects
History, Classics
Abstract

The honours granted by Hellenistic poleis to their benefactors long formed a means of creating ideological distance, integrating the power of kings and powerful outsiders, while maintaining civic agency and autonomy. Did this change under the rule of Rome? This article suggests that the civic honours for Roman officials, and later for the emperor, contributed over the 1st century BCE to a gradual development in mindset towards the honouring of local citizens in western Asia Minor, by which the traditional aims of exemplarity and social replication came to be overshadowed, if never replaced, by that of individual commemoration. It argues that this happened over two main phases in the period 85 BCE to 14 CE. In the first, the benefactions and honours of Roman officials as representatives of civic interests intruded upon those of civic notables, resulting in an elevation in the honorific status of the latter, and a tendency to emphasise the memorability of their achievements. The subsequent onset of the principate and imperial cult imposed a limit to local honorific status, and encouraged the articulation of internal honorific hierarchies among civic notables through honorific titles and claims to familial primacy, accentuating interest in representing individuality, to the diminution of imitability.

Published
2023
Full Text
View/download PDF

45. Rivaroxaban or aspirin for patent foramen ovale and embolic stroke of undetermined source: a prespecified subgroup analysis from the NAVIGATE ESUS trial

Author

Abdelhamid, N, Abdul Rahman, D, Abdul-Saheb, M, Abreu, P, Abroskina, M, Abu Ahmad, F, Accassat, S, Acciaresi, M, Adami, A, Ahmad, N, Ahmed, F, Alberto Hawkes, M, Alemseged, F, Ali, A, Altavilla, R, Alwis, L, Amarenco, P, Amaro, S, Amaya Sanchez, LE, Amelia Pinto, A, Ameriso, SF, Amin, H, Amino, T, Amjad, AK, Anagnostou, E, Andersen, G, Anderson, C, Anderson, DC, Andrea Falco, M, Andres Mackinnon, F, Andreu, D, Androulakis, M, Angel Gamero, M, Angel Saredo, G, Angeles Diaz, R, Angels Font, M, Anticoli, S, Arauz, A, Arauz Gongora, AA, Araya, P, Arenillas Lara, JF, Arias Rivas, S, Arnold, M, Augustin, S, Avelar, W, Azevedo, E, Babikian, V, Bacellar, A, Badalyan, K, Bae, HJ, Baez Martinez, EM, Bagelmann, H, Bailey, P, Bak, Z, Baker, M, Balazs, A, Baldaranov, D, Balogun, I, Balueva, T, Bankuti, Z, Bar, M, Baranowska, A, Bardutzky, J, Barker Trejo, S, Barlinn, J, Baronnet, F, Barroso, C, Barteys, M, Bartolottiova, T, Barulin, A, Bas, M, Bashir, S, Basile, V, Bathe-Peters, R, Bathula, R, Batista, C, Batur Caglayan, H, Baumgartner, P, Bazan, R, Bazhenova, O, Beaudry, M, Beer, J, Behnam, Y, Beilei, C, Beinlich, A, Bejot, Y, Belkin, A, Benavente, OR, Benjamin, A, Berardi, V, Bereczki, D, Berkowitz, SD, Berlingieri, J, Berrios, W, Berrouschot, J, Bhandari, M, Bhargavah, M, Bicker, H, Bicsak, T, Bilik, M, Bindila, D, Birchenall, J, Birnbaum, L, Black, T, Blacker, D, Blacquiere, D, Blanc-Labarre, C, Blank, C, Blazejewska-Hyzorek, B, Bloch, S, Bodiguel, E, Bogdanov, E, Boos, L, Borcsik, L, Bornstein, N, Bouly, S, Braga, G, Bragado, I, Bravi, MC, Brokalaki, C, Brola, W, Brouns, R, Bruce, D, Brzoska-Mizgalska, J, Buck, B, Buksinska-Lisik, M, Burke, J, Burn, M, Bustamante, G, Cabrejo, L, Cai, K, Cajaraville, S, Calejo, M, Calvet, D, Campillo, J, Campos Costa, E, Camps, P, Can Alaydin, H, Candeloro, E, Canepa, C, Cantu Brito, CG, Cappellari, M, Carcel, C, Cardona Portela, P, Cardoso, F, Carek, M, Carletti, M, Carlos Portilla, J, Caruso, P, Casado-Naranjo, I, Castellini, P, Castro, D, Castro Meira, F, Cavallini, A, Cayuela Caudevilla, N, Cenciarelli, S, Cereda, C, Cerrone, P, Chakrabarti, A, Chaloulos-Iakovidis, P, Chamorro, A, Chandrasena, D, Chang, DI, Che, C, Chembala, J, Chen, J, Chen, Z, Chen, T, Chen, H, Chen, X, Chen, G, Chen, L, Chen, S, Cheripelli, B, Chin, M, Chiquete Anaya, E, Chorazy, M, Christensen, H, Christensen, T, Christian, L, Chu, F, Chung, CS, Clark, W, Clarke, R, Claverie, S, Clemente Agostoni, E, Clissold, B, Coelho, J, Cohen, D, Colakoglu, S, Collas, D, Condurso, R, Connolly, SJ, Consoli, D, Constantin, C, Constantino Silva, AB, Contardo, L, Corlobe, A, Correia, M, Correia, C, Cortijo Garcia, E, Coull, B, Coutts, S, Coveney, S, Cras, P, Crols, R, Crozier, S, Csanyi, A, Csiba, L, Csontos, K, Csuha, R, Cui, L, Cunha, L, Curtze, S, Czerska, M, Czlonkowska, A, Czurko, M, Czuryszkiewicz, M, Dagnino, M, Dai, C, Daineko, A, Dalek, G, Damgaard, D, Danese, A, Dani, K, Danku, V, Dario Toledo, W, Dávalos, A, De Havenon, A, De Keyser, J, De Klippel, N, De La Torre, J, De Pauw, A, De Smedt, A, De Torres, R, De Vries Basson, MM, Dearborn, J, Deganutto, R, Degeorgia, M, Deguchi, I, Del Giudice, A, Delcourt, C, Delgado-Mederos, R, Della Marca, G, Delpont, B, Deltour, S, Demets, DL, Dennis, M, Desai, J, Devine, J, Dhollander, I, Di Mascio, MT, Diaconu, M, Diaz Otero, F, Dietzel, J, Diez-Tejedor, E, Ding, N, Ding, J, Diomedi, M, Dioszeghy, P, Distefano, M, Domigo, V, Dorodnicov, E, Dossi, D, Doubal, F, Druzenko, I, Du, P, Du, J, Duman, T, Duodu, Y, Dutta, D, Dylewicz, L, Eckstein, J, Ehrensperger, E, Ehrlich, S, Einer Allende, G, Elena Halac, B, Elyas, S, Endres, M, Engelbrecht, JM, Engelter, S, Epinat, M, Eren, F, Esbjornsson, M, Escribano, B, Escudero, I, Esisi, B, Essa, B, Esterbauer, M, Evans, N, Eveson, D, Fabio, S, Fang, L, Fanta, S, Fares, M, Fatar, M, Faust, K, Favate, A, Fazekas, F, Federica Denaro, M, Fedin, A, Felipe Amaya, P, Feng, J, Ferencova, K, Fernanda Gilli, M, Fernandez, MD, Fernandez Pirrone, PN, Fernandez Vera, J, Ferrari, J, Ferreira, A, Ferreira Junior, G, Fidler, M, Field, D, Field, T, Figueroa, C, Fiksa, J, Filipov, A, Firstenfeld, A, Fisch, L, Fischer, U, Fisselier, M, Fiszer, U, Fluri, F, Fortea, G, Fotherby, K, Fraczek, A, France, E, Freitas, G, Frey, S, Frick, M, Friedman, A, Friedrich, M, Frisullo, G, Fryze, W, Fuentes Gimeno, B, Fujigasaki, H, Fukuyama, K, Furlan, A, Furlanis, G, Furnace, J, Gabriel, M, Gabriel Reich, E, Gagliardi, RJ, Galati, F, Galli Giqueauk, E, Gallina, A, Gallinella, E, Gallo, J, Gangadharan, S, Gao, Y, Garcia Lopez, R, Garcia Pastor, A, Garcia Sanchez, SM, Garnauf, M, Garnier, P, Gasecki, D, Gasic, K, Gasiorek, K, Gasser, S, Gaugg, M, Gebreyohanns, M, Gebura, K, Geng, J, Geniz Clavijo, M, Georg Haeusler, K, Geran, R, Geremek, M, Gerocs, Z, Ghia, D, Giannandrea, D, Giatsidis, F, Gien Lopez, JA, Gil Nunez, A, Gimenez, L, Giralt, E, Glabinski, A, Gladstone, D, Gliem, M, Gluszkiewicz, M, Goddeau, R, Gogoleva, E, Gokce, M, Goldemund, D, Golikov, K, Gomes Neto, A, Gomez Schneider, M, Gomez-Choco, M, Gomis, M, Gongora-Rivera, JF, Gonysheva, Y, Gonzalez, L, Gonzalez Toledo, ME, Gottschal, M, Gozdzik, I, Grabowski, S, Graf, S, Green, D, Greer, D, Gregorio, T, Greisenegger, S, Greshnova, I, Griebe, M, Grzesik, M, Guan, J, Guarda, S, Gueguen, A, Guidoux, C, Guillermo Povedano, P, Guillon, B, Guiraudg, V, Gunathilagan, G, Guryanova, N, Gusev, V, Gustavo Persi, G, Gutiérrez, R, Guyler, P, Gyuker, N, Hachinski, V, Hajas, A, Hallevi, H, Hankey, G, Hankey, GJ, Hanouskova, L, Hao, L, Haraguchi, K, Haralur Sreekantaiah, Y, Haratz, S, Hargroves, D, Harkness, K, Harmel, P, Harrasser, M, Hart, RG, Harvey, M, Hasan, R, Hasegawa, Y, Hassan, A, Hattori, M, Hatzitolios, A, Hauk, M, Hayashi, T, Hayhoe, H, Hedna, VS, Heine, M, Held, V, Hellwig, S, Henkner, J, Henninger, N, Hermans, S, Hernandez, J, Herrero, D, Hervieu-Begue, M, Herzig, R, Hicken, L, Hieber, M, Hill, M, Hirose, M, Hobeanu, MC, Hobson, B, Hochstetter, M, Hoe Heo, J, Hoffmann, M, Holmstedt, C, Hon, P, Hong, KS, Honma, Y, Horev, A, Horgan, G, Horvath, L, Horvath, M, Hoyer, C, Huang, D, Huang, H, Huber, B, Huhtakangas, J, Hussain, M, Igarashi, S, Iglesias Mohedano, AM, Ignacio Tembl, J, Impellizzeri, M, Inanc, Y, Ioli, P, Irina Aniculaesei, A, Ishida, K, Itabashi, R, Iversen, H, Jagolino, A, Jakab, K, Jander, S, Janka, H, Jankovych, J, Jansen, J, Jasek, L, Javier Alet, M, Javor, L, Jin, X, Jing, P, Joachim, B, Joan Macleod, M, Johnson, M, Jose Martin, J, Joyner, C, Judit Szabo, K, Jun-Oconnell, A, Jura, R, Kaczorowska, B, Kadlcikova, J, Kahles, T, Kakaletsis, N, Kakuk, I, Kalinowska, K, Kaminska, K, Kaneko, C, Kanellos, I, Kapeller, P, Kapica-Topczewska, K, Karasz, O, Karlinski, M, Karlsson, JE, Kasa, K, Kashaeva, E, Kasner, SE, Kaste, M, Kasza, J, Katalin Iljicsov, A, Katsurayama, M, Kaur, S, Kawanishi, M, Kaygorodtseva, S, Ke, K, Kei, A, Keilitz, J, Kellner, J, Kelly, P, Kelly, S, Kemlink, D, Kerekgyarto, M, Keskinarkaus, I, Khairutdinova, D, Khanna, A, Khaw, A, Kholopov, M, Khoumri, C, Kirpicheva, S, Kirshner, H, Kitagawa, K, Kittner, S, Kivioja, R, Klein, F, Kleindorfer, D, Kleinig, T, Klivenyi, P, Knecht, S, Kobayashi, Y, Kobayashi, A, Koch, M, Koehler, L, Koivu, M, Kolianov, V, Koltsov, I, Kondo, T, Konkov, I, Kopecky, S, Korompoki, E, Korpela, J, Kosarz-Lanczek, K, Koutroubi, A, Kovacs, K, Kovacs, T, Kovacs, H, Kowalczyk, K, Kowalska, M, Krajickova, D, Kral, M, Krarup Hansen, C, Kraska, J, Krebs, S, Krejci, V, Kremer, C, Kreuzpointer, R, Krzyzanowska, M, Kucken, D, Kulakowska, A, Kunzmann, J, Kurenkova, N, Kuris, A, Kurkowska-Jastrzebska, I, Kurtenkova, N, Kurushina, O, Kusnick, G, Kustova, M, Kuwashiro, T, Kwan Cha, J, Lago, A, Lagutenko, M, Lajos, B, Lambeck, J, Lamy, C, Landolfi, A, Lanfranconi, S, Lang, W, Lara Lezama, LB, Lara Rodriguez, B, Largo, T, Lasek-Bal, A, Latte, L, Lauer, V, Lavados, P, Le Bouc, R, Leal Cantu, R, Lechner, H, Lecouturier, K, Leder, S, Lee, J, Lee, BC, Leger, A, Leira, E, Leisse, I, Leker, R, Lembo, G, Lenskaya, L, Leyden, J, Li, G, Li, M, Li, S, Li, J, Liamis, G, Liang, H, Liang, Z, Ligot, N, Lin, H, Lindert, R, Lindgren, A, Linna, M, Litwin, T, Liu, K, Liu, X, Llull, L, Lohninger, B, Longoni, M, Loomis, C, Lopes, D, Lopez Fernandez, M, Lopez Garza, N, Lord, A, Louw, S, Lovasz, R, Lowenkopf, T, Lu, Z, Lubke-Detring, SC, Luder, R, Lujan, S, Luo, B, Lupinogina, L, Luschin, G, Lutsep, H, Lvova, A, Ly, J, Grosse, G.M., Ma, H, Ma, C, Machado, M, Machado, C, Macher, S, Machetanz, J, Macian-Montoro, F, Mackey, E, Mackey, A, Maclean, G, Maestre-Moreno, J, Magadan, A, Magyar, T, Mahagney, A, Majid, A, Majjhoo, A, Makaritsis, K, Mandzia, J, Mangas Guijarro, M, Mangion, D, Manios, E, Mann, S, Manning, L, Manno, C, Manuel Garcia, J, Maqueda, V, Mar Castellanos, M, Mar Freijo, M, Marando, C, Marcela Lepera, S, Marcos Couto, J, Maria Bruera, G, Maria Greco, L, Maria Lorenzo, A, Maria Obmann, S, Maria Roa, A, Marini, C, Marinkovic, I, Mario Sumay, G, Mario Torres, C, Marko, M, Markova, S, Markus, H, Marsh, R, Marsili, E, Marta Esnaola, M, Marta Moreno, J, Marti-Fabregas, J, Martina Angelocola, S, Martínez Sánchez, P, Martinez-Majander, N, Martins, S, Marzelik, O, Mastrocola, S, Matamala, G, Matoltsy, A, Matosevic, B, Matsumoto, S, Maud, A, Mauri Cabdevila, G, May, Z, Mayasi, Y, Mayr, A, Mazzoli, T, Mcarthur, K, Mccullough, L, Medina Pech, CE, Medlin, F, Mehdiratta, M, Mehta, S, Mehta, D, Mehta, B, Melis, M, Melnikova, E, Mendez, B, Mendonca, T, Mengual Chirifie, JJ, Menon, N, Mensch, A, Meseguer, E, Messe, S, Metcalf, K, Meyer, N, Michas, F, Micheletti, N, Mikulik, R, Milionis, H, Miller, B, Milling, T, Minelli, C, Minhas, J, Minns, M, Mircea, D, Mishra, S, Mismas, A, Mistri, A, Mitrovic, N, Miyake, H, Modrau, B, Moey, A, Molina, C, Molina, J, Molis, A, Moller, J, Molnar, S, Moniche, F, Monosi, C, Monzani, V, Moonis, M, Morais, R, Morales, L, Morales, A, Morar-Precup, D, Moreton, F, Moro, C, Morozova, E, Morton, M, Morvan, T, Morvan, E, Motko, T, Mowla, A, Mozhejko, E, Muddegowda, G, Mudhar, O, Mueller, T, Muhl, C, Muir, KW, Mundl, H, Munoz, S, Murphy, C, Murphy, S, Murtuzova, A, Musuka, T, Mutzenbach, J, Myint, M, Mysliwy, W, Naccarato, M, Naeije, G, Nagakane, Y, Natarajan, I, Navaratnam, D, Nave, A, Nazliel, B, Nedeltchev, K, Nel, J, Nell, H, Nemeth, R, Nemeth, L, Neto, O, Ng, K, Ngeh, J, Nicolas Chialvo, L, Nieminen, T, Nikkanen, M, Nikl, J, Nikoforova, M, Nishino, S, Nishiyama, Y, Njovane, X, Nogawa, S, Nombela, F, Norrving, B, Nosek, K, Nowak, B, Nowakowska-Sledz, E, Ntaios, G, Numminen, H, Nunez, F, Obadia, M, Oberndorfer, S, Obrezan, A, Ochiai, J, Oczkowski, W, O'Donnell, MJ, Odyniec, A, Oh, K, Ohira, M, Okamoto, Y, Okpala, M, Okubo, S, Olah, L, Olavarria, V, Oleszek, J, Onat Demirci, N, Ondar, V, Ongun, G, Ooyama, K, Orosz, V, Ortiz, R, Osseby, G, Österlund-Tauriala, E, Ovesen, C, Ozcekic Demirhan, S, Ozdoba-Rot, J, Ozturk, S, Ozyurt, E, Pablo Grecco, M, Pablo Povedano, G, Paciaroni, M, Padiglioni, C, Pagola, J, Palasik, W, Panczel, G, Panos, L, Papadopoulos, G, Papadopoulou, E, Papagiannis, A, Papavasileiou, V, Papina, M, Pardo De Donlebun, JR, Parisi, V, Park, JM, Pasten, J, Patel, N, Pavlik, O, Pawelczyk, M, Peacock, WF, Pei, H, Peisker, T, Pena Sedna, LF, Penn, A, Pentek, S, Pepper, E, Pereira, L, Perera, K, Perez, Y, Perez, S, Perez Leguizamon, P, Pernicka, M, Perry, R, Persico, A, Pesant, Y, Peska, S, Peters, D, Peters, G, Pettigrew, L, Phan, T, Philippi, S, Phinney, T, Pico, F, Pidal, A, Piechowski-Jozwiak, B, Pieroni, A, Pineiro, S, Piras, V, Pizova, N, Polanco, J, Polin, M, Polyakov, A, Polychronopoulou, E, Polymeris, A, Popov, D, Poppe, A, Postorino, P, Pozzerese, C, Pradhan, M, Prats, L, Prazdnichkova, E, Prendl, B, Pretorius, M, Profice, P, Prokopenko, S, Pudov, E, Pujol Lereis, V, Punzo Bravo, G, Purroy, F, Qiu, J, Qu, X, Quenardelle, V, Quesada Garcia, H, Radrizzani, L, Radtke, A, Raffelsberger, T, Ramirez Moreno, JM, Ramos-Estebanez, C, Rani, A, Rapantova, P, Rashed, K, Rasheed Nihara, A, Rasmussen, J, Redondo Robles, L, Reif, M, Reiner, P, Rekova, P, Renu, A, Repetto, M, Reyes, P, Reyes Morales, S, Rha, JH, Ribeiro, J, Ricci, S, Richard, C, Rigual, R, Rinaldi, C, Riveira Rodriguez, C, Rizzato, B, Robinson, TG, Rocco, A, Rodrigues, M, Rodriguez, G, Rodriguez Campello, A, Rodriguez Lucci, F, Rodriguez Yanez, M, Roesler, C, Roffe, C, Roine, R, Roine, S, Roldan, A, Romana Pezzella, F, Romano, M, Roos, JS, Rosso, C, Rostrup Kruuse, C, Roth, Y, Roukens, R, Roveri, L, Rozanski, D, Rozniecki, J, Rozsa, C, Rudilosso, S, Ruiz Ares, G, Ruiz Franco, A, Rum, G, Ruuskanen, J, Rybinnik, I, Ryota, K, Saarinen, J, Saavedra, V, Sabben, C, Sabet, A, Sagris, D, Sahlas, J, Sakai, N, Salamanca, P, Salgado, P, Salig, S, Salletmayr, T, Salnikov, M, Samoshkina, O, Samson, Y, Sanak, D, Sànchez Cerón, M, Santalucia, P, Santamaria Cadavid, M, Santiago, P, Santo, G, Sanz Cuesta, B, Sargento, J, Sarraj, A, Sas, K, Sas, A, Satoshi, O, Satsoglou, S, Sattar, N, Savitz, S, Savopoulos, C, Saw, J, Sawicka, M, Sawyer, R, Scandura, T, Schillinger, N, Schindler, J, Schlachetzki, F, Schneider, I, Schuppner, R, Schurig, J, Schwarzbach, CJ, Sebejova, M, Seidel, G, Sekaran, L, Selcuk, D, Selvarajah, J, Semerano, A, Semjen, J, Semushina, D, Sen, S, Seok Park, M, Serena, J, Serhat Tokgoz, O, Serles, W, Serrano, F, Sevin, M, Seynaeve, L, Shah, S, Shamalov, N, Shang, T, Sharma, M, Sharrief, A, Shazam Hussain, M, Shchukin, I, Shen, W, Shepeleva, E, Shinsuke, I, Shmonin, A, Shoamanesh, A, Shuaib, A, Shulga, A, Sibolt, G, Sibon, I, Sicilia, I, Siebert, M, Sieczkowska, E, Sila, C, Silva, AA, Silva, D, Silva, P, Silva, Y, Silvestrini, M, Simony, Z, Simpkins, A, Singh, B, Sinha, D, Sipos, I, Skoda, O, Skowron, P, Skowronska, M, Sliwinska, B, Slonkova, J, Smolkin, A, Smyth, A, Sobolewski, P, Sobota, A, Sohn, SI, Soldatov, M, Solganov, I, Soloveva, L, Solovyeva, E, Sonntag, N, Soors, P, Sorgun, M, Soriano, C, Spence, D, Spengos, K, Sposato, L, Staaf, G, Stadler, K, Stakhovskaya, L, Stamatelopoulos, K, Steinert, S, Stetkarova, I, Stiehm, M, Stocker, R, Stoinski, J, Stoll, A, Stotts, G, Stumpp, A, Sucapane, P, Suenaga, T, Sun, X, Sundararajan, S, Sung Kim, J, Suzuki, H, Svaneborg, N, Szasz, G, Szczuchniak, W, Szczyrba, S, Szegedi, N, Szekely, A, Szewczyk, Z, Szilagyi, G, Szlufik, S, Szoboszlai, K, Szpisjak, L, Sztajzel, R, Sztriha, L, Ta Wil, SE, Taggeselle, J, Takamatsu, K, Takao, M, Taki, W, Takizawa, S, Talahma, M, Tamayo, A, Tan, J, Tanne, D, Tapanainen, A, Tapiola, T, Tarasiuk, J, Tatlisumak, T, Tayal, A, Tcvetkova, S, Teal, P, Tejada Garcia, J, Tejada Meza, H, Tenora, D, Terceno, M, Terentiou, A, Tezcan, S, Thaler, D, Thomson, A, Thouvenot, E, Tiainen, M, Timberg, I, Timsit, S, Tinchon, A, Tirschwell, D, Togay Isikay, C, Tokunaga, K, Tolino, M, Toloza, C, Tomelleri, G, Tomoyuki, K, Tomppo, LM, Tong, Z, Tong, L, Toni, D, Torres, J, Tossavainen, C, Toth, G, Tountopoulou, A, Touze, E, Tovar, M, Toyoda, K, Trillo, S, Trommer, A, Tropepi, D, Tryambake, D, Tu, H, Tuetuencue, S, Tumova, R, Tumpula, O, Turc, G, Tutaj, A, Tynkkynen, J, Uchiyama, S, Uchwat, U, Uhrinyakova, L, Ulku Acar, R, Uluduz Ugurlu, D, Urra, X, Urui, S, Usero Ruiz, M, Vaclavik, D, Vahedi, K, Valikovics, A, Valpas, J, Van Acker, P, Van Daele, W, Vanderschueren, G, Vanina Jure, L, Varela, R, Varga, Z, Varvat, J, Varvyanskaya, N, Vasco Salgado, A, Vasko, P, Vass, L, Vassilopoulou, S, Vastagh, I, Vazquez, P, Vecsei, L, Veltkamp, R, Venti, M, Verdugo, M, Verocai, V, Veronica Marroquin, M, Veronica Simonsini, C, Veverka, T, Vigl, M, Vila, A, Vilar, C, Villanueva Osorio, JA, Virta, J, Vitkova, E, Voglsperger, B, Volna, J, Von Weitzel-Mudersbach, PA, Vora, N, Voznyuk, I, Wach-Klink, A, Wacongne, A, Walters, D, Wang, Y, Wang, J, Wang, L, Wang, X, Wang, W, Wang, N, Wang, D, Wang, H, Warnack, W, Wartenberg, K, Waters, R, Waters, M, Webb, T, Weber, J, Weiss, G, Weissenborn, K, Weitz, JI, Weller, B, Wen, G, Weng, G, Werner, P, Werring, D, Wester, P, Whiteley, W, Whiting, R, Wijeratne, T, Willems, C, Wilson, L, Wilson, C, Winder, T, Windt, J, Winkler, A, Winska-Tereszkiewicz, A, Wisniewska, A, Wittayer, M, Wlodek, A, Wojnarowska-Arendt, A, Wolf, M, Wolff, V, Wolter, C, Wong, A, Wook Nah, H, Worthmann, H, Wu, W, Wu, S, Wunderlich, S, Wurzinger, H, Wyse, DG, Xiao, B, Xiaopeng, W, Ximenez-Carrillo, A, Xiong, L, Xiong, Y, Xiong, W, Xu, Y, Xu, J, Xu, Z, Yalo, B, Yamada, T, Yamasaki, M, Yang, L, Yang, Y, Yang, X, Yang, Q, Yang, B, Yang, J, Yasuhiro, I, Yee Lam, M, Yegappan, C, Yip, S, Ylikallio, E, Ylikotila, P, Yongwon Jin, A, Yoon, BW, Yoshida, Y, Yperzeele, L, Yuan, H, Yuasa, H, Zalewska, J, Zanferrari, C, Zapata, E, Zboznovits, D, Zelenka, I, Zhang, C, Zhang, B, Zhang, S, Zhang, M, Zhang, X, Zhang, J, Zhao, L, Zhirnova, O, Zhou, L, Zielinska-Turek, J, Zinchenko, I, Ziomek, M, Zitzmann, A, Zweifler, R, Zwiernik, J, Kasner, Scott E, Swaminathan, Balakumar, Lavados, Pablo, Sharma, Mukul, Muir, Keith, Veltkamp, Roland, Ameriso, Sebastian F, Endres, Matthias, Lutsep, Helmi, Messé, Steven R, Spence, J David, Nedeltechev, Krassen, Perera, Kanjana, Santo, Gustavo, Olavarria, Veronica, Lindgren, Arne, Bangdiwala, Shrikant, Shoamanesh, Ashkan, Berkowitz, Scott D, Mundl, Hardi, Connolly, Stuart J, and Hart, Robert G

Published
2018
Full Text
View/download PDF

46. Source attributions of pollution to the Western Arctic during the NASA ARCTAS field campaign

Author

Bian, H., Colarco, P. R, Chin, M., Chen, G., Rodriguez, J. M, Liang, Q., Blake, D., Chu, D. A, da Silva, A., Darmenov, A. S, Diskin, G., Fuelberg, H. E, Huey, G., Kondo, Y., Nielsen, J. E, Pan, X., and Wisthaler, A.

Subjects
Aerosol Optical Depth, Carbon-Monoxide, Air-Pollution, Black Carbon, Organic Aerosol, Model, Transport, Aircraft, Troposphere, Emissions
Published
2013

47. A two‐decade population‐based study on the effect of hypertension in the general population with obesity in the United States

Author

Gwyneth Kong, Yip H. Chin, Jieyu Lim, Cheng H. Ng, Shankar Kannan, Bryan Chong, Chaoxing Lin, Kai E. Chan, Vickram V. Anand, Ethan C. Z. Lee, Shaun Loong, Zhen Y. Wong, Chin M. Khoo, Mark Muthiah, Roger Foo, Georgios K. Dimitriadis, Gemma A. Figtree, Yibin Wang, Mark Chan, and Nicholas W. S. Chew

Subjects
Nutrition and Dietetics, Endocrinology, Endocrinology, Diabetes and Metabolism, Medicine (miscellaneous)
Published
2023
Full Text
View/download PDF

48. PUMPING THE BRAKES: EXAMINING THE IMPACT OF CEO POLITICAL IDEOLOGY DIVERGENCE ON FIRM RESPONSES.

Author

SEMADENI, MATTHEW, CHIN, M. K., and KRAUSE, RYAN

Subjects
CHIEF executive officers, IDEOLOGY, INDIVIDUAL differences, BUSINESS enterprises, POLITICAL attitudes, DECISION making, CORPORATE profits
Abstract

Research on CEO political ideology has demonstrated the construct's impact on many firm outcomes. Yet, political ideology does not exist in a vacuum; beyond representing a CEO's values, political ideology also affects the CEO's perception of the political environment. It remains unclear how a difference between the national political climate and the CEO's own political ideology might affect strategic decision-making. Applying upper echelons and threat response perspectives, we propose that divergence between the national political climate and the CEO's own ideology provokes a threat response, leading CEOs to cut research and development spending and increase retained earnings. We then examine two boundary conditions for this relationship. First, we propose that CEO wealth tied to the firm in the form of vested stock options will increase the perceived threat of ideology divergence, strengthening the threat response. Second, we propose that industry regulation will dampen the threat perceived from divergence, as well as hindering the CEO's ability to respond to the threat at all, because of greater stability and lower discretion, respectively. We test these predictions on a sample of Standard & Poor's 500 CEOs from 2004 to 2017 and find support for our hypothesized relationships. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

49. Reactive nitrogen, ozone and ozone production in the Arctic troposphere and the impact of stratosphere-troposphere exchange

Author

Liang, Q, Rodriguez, JM, Douglass, AR, Crawford, JH, Olson, JR, Apel, E, Bian, H, Blake, DR, Brune, W, Chin, M, Colarco, PR, Da Silva, A, Diskin, GS, Duncan, BN, Huey, LG, Knapp, DJ, Montzka, DD, Nielsen, JE, Pawson, S, Riemer, DD, Weinheimer, AJ, and Wisthaler, A

Subjects
Meteorology & Atmospheric Sciences, Astronomical and Space Sciences, Atmospheric Sciences
Abstract

We use aircraft observations obtained during the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission to examine the distributions and source attributions of O 3 and NO y in the Arctic and sub-Arctic region. Using a number of marker tracers, we distinguish various air masses from the background troposphere and examine their contributions to NO x, O 3, and O 3 production in the Arctic troposphere. The background Arctic troposphere has a mean O 3 of ∼60 ppbv and NO x of ∼25 pptv throughout spring and summer with CO decreasing from ∼145 ppbv in spring to ∼100 ppbv in summer. These observed mixing ratios are not notably different from the values measured during the 1988 ABLE-3A and the 2002 TOPSE field campaigns despite the significant changes in emissions and stratospheric ozone layer in the past two decades that influence Arctic tropospheric composition. Air masses associated with stratosphere-troposphere exchange are present throughout the mid and upper troposphere during spring and summer. These air masses, with mean O 3 concentrations of 140-160 ppbv, are significant direct sources of O 3 in the Arctic troposphere. In addition, air of stratospheric origin displays net O 3 formation in the Arctic due to its sustainable, high NO x (75 pptv in spring and 110 pptv in summer) and NO y (∼800 pptv in spring and ∼1100 pptv in summer). The air masses influenced by the stratosphere sampled during ARCTAS-B also show conversion of HNO 3 to PAN. This active production of PAN is the result of increased degradation of ethane in the stratosphere-troposphere mixed air mass to form CH 3CHO, followed by subsequent formation of PAN under high NO x conditions. These findings imply that an adequate representation of stratospheric NO y input, in addition to stratospheric O 3 influx, is essential to accurately simulate tropospheric Arctic O 3, NO x and PAN in chemistry transport models. Plumes influenced by recent anthropogenic and biomass burning emissions observed during ARCTAS show highly elevated levels of hydrocarbons and NO y (mostly in the form of NO x and PAN), but do not contain O 3 higher than that in the Arctic tropospheric background except some aged biomass burning plumes sampled during spring. Convection and/or lightning influences are negligible sources of O 3 in the Arctic troposphere but can have significant impacts in the upper troposphere in the continental sub-Arctic during summer. © 2011 Author(s).

Published
2011

50. Global dust model intercomparison in AeroCom phase I

Author

Huneeus, N., Schulz, M., Balkanski, Y., Griesfeller, J., Prospero, J., Kinne, S., Bauer, S., Boucher, O., Chin, M., Dentener, F., Diehl, T., Easter, R., Fillmore, D., Ghan, S., Ginoux, P., Grini, A., Horowitz, L., Koch, D., Krol, M. C, Landing, W., Liu, X., Mahowald, N., Miller, R., Morcrette, J.-J., Myhre, G., Penner, J., Perlwitz, J., Stier, P., Takemura, T., and Zender, C. S

Subjects
General-circulation model, atmospheric iron deposition, last glacial maximum, mineral dust, aerosol direct, tropospheric chemistry, optical-properties, Goddard-Institute, North-Atlantic, sulfur cycle
Abstract

This study presents the results of a broad intercomparison of a total of 15 global aerosol models within the AeroCom project. Each model is compared to observations related to desert dust aerosols, their direct radiative effect, and their impact on the biogeochemical cycle, i.e., aerosol optical depth (AOD) and dust deposition. Additional com parisons to Angstrom exponent (AE), coarse mode AOD and dust surface concentrations are included to extend the assessment of model performance and to identify common biases present in models. These data comprise a benchmark dataset that is proposed for model inspection and future dust model development. There are large differences among the global models that simulate the dust cycle and its impact on climate. In general, models simulate the climatology of vertically integrated parameters (AOD and AE) within a factor of two whereas the total deposition and surface concentration are reproduced within a factor of 10. In addition, smaller mean normalized bias and root mean square errors are obtained for the climatology of AOD and AE than for total deposition and surface concentration. Characteristics of the datasets used and their uncertainties may influence these differences. Large uncertainties still exist with respect to the deposition fluxes in the southern oceans. Further measurements and model studies are necessary to assess the general model performance to reproduce dust deposition in ocean regions sensible to iron contributions. Models overestimate the wet deposition in regions dominated by dry deposition. They generally simulate more realistic surface concentration at stations downwind of the main sources than at remote ones. Most models simulate the gradient in AOD and AE between the different dusty regions. However the seasonality and magnitude of both variables is better simulated at African stations than Middle East ones. The models simulate the offshore transport of West Africa throughout the year but they overestimate the AOD and they transport too fine particles. The models also reproduce the dust transport across the Atlantic in the summer in terms of both AOD and AE but not so well in winter-spring nor the southward displacement of the dust cloud that is responsible of the dust transport into South America. Based on the dependency of AOD on aerosol burden and size distribution we use model bias with respect to AOD and AE to infer the bias of the dust emissions in Africa and the Middle East. According to this analysis we suggest that a range of possible emissions for North Africa is 400 to 2200 Tg yr(-1) and in the Middle East 26 to 526 Tg yr(-1)

Published
2011

Catalog

Books, media, physical & digital resources
See catalog results