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402 results on '"Stutz,J"'

1. Distortions in Charged-Particle Images of Laser Direct-Drive Inertial Confinement Fusion Implosions

Author

Heuer, P. V., Peebles, J. L., Kunimune, J., Rinderknecht, H. G., Davies, J. R., Gopalaswamy, V., Frelier, J., Scott, M., Roberts, J., Brannon, B., McClow, H., Fairbanks, R., Regan, S. P., Frenje, J. A., Johnson, M. Gatu, Séguin, F. H., Crilly, A. J., Appelbe, B. D., Farrell, M., and Stutz, J.

Subjects
Physics - Plasma Physics
Abstract

Energetic charged particles generated by inertial confinement fusion (ICF) implosions encode information about the spatial morphology of the hot-spot and dense fuel during the time of peak fusion reactions. The knock-on deuteron imager (KoDI) was developed at the Omega Laser Facility to image these particles in order to diagnose low-mode asymmetries in the hot-spot and dense fuel layer of cryogenic deuterium--tritium ICF implosions. However, the images collected are distorted in several ways that prevent reconstruction of the deuteron source. In this paper we describe these distortions and a series of attempts to mitigate or compensate for them. We present several potential mechanisms for the distortions, including a new model for scattering of charged particles in filamentary electric or magnetic fields surrounding the implosion. A novel particle-tracing methodology is developed and utilized to create synthetic KoDI data based on the filamentary field model that reproduces the main experimentally observed image distortions. We conclude with a discussion of the outlook for KoDI, and potential considerations for other charged-particle diagnostics.

Published
2024

3. Chlorine as a primary radical: evaluation of methods to understand its role in initiation of oxidative cycles

Author

Young, C. J, Washenfelder, R. A, Edwards, P. M, Parrish, D. D, Gilman, J. B, Kuster, W. C, Mielke, L. H, Osthoff, H. D, Tsai, C., Pikelnaya, O., Stutz, J., Veres, P. R, Roberts, J. M, Griffith, S., Dusanter, S., Stevens, P. S, Flynn, J., Grossberg, N., Lefer, B., Holloway, J. S, Peischl, J., Ryerson, T. B, Atlas, E. L, Blake, D. R, and Brown, S. S

Subjects
volatile organic-compounds, master chemical mechanism, marine boundary-layer, gas-phase reactions, mcm v3 part, atomic chlorine, tropospheric degradation, los-angeles, cl atom, halocarbon measurements
Published
2014

4. Longpath DOAS observations of surface BrO at Summit, Greenland

Author

Stutz, J., Thomas, J. L, Hurlock, S. C, Schneider, M., von Glasow, R., Piot, M., Gorham, K., Burkhart, J. F, Ziemba, L., Dibb, J. E, and Lefer, B. L

Subjects
absorption cross-sections, boundary-layer, ozone destruction, tropospheric bro, peroxy-radicals, chemistry, temperature, region, snow, air
Abstract

Abstract. Reactive halogens, and in particular bromine oxide (BrO), have frequently been observed in regions with large halide reservoirs, for example during bromine catalyzed coastal polar ozone depletion events. Much less is known about the presence and impact of reactive halogens in areas without obvious halide reservoirs, such as the polar ice sheets or continental snow.

Published
2011

6. When Gravity Fails: Local Search Topology

Author

Frank, J., Cheeseman, P., and Stutz, J.

Subjects
Computer Science - Artificial Intelligence
Abstract

Local search algorithms for combinatorial search problems frequently encounter a sequence of states in which it is impossible to improve the value of the objective function; moves through these regions, called plateau moves, dominate the time spent in local search. We analyze and characterize plateaus for three different classes of randomly generated Boolean Satisfiability problems. We identify several interesting features of plateaus that impact the performance of local search algorithms. We show that local minima tend to be small but occasionally may be very large. We also show that local minima can be escaped without unsatisfying a large number of clauses, but that systematically searching for an escape route may be computationally expensive if the local minimum is large. We show that plateaus with exits, called benches, tend to be much larger than minima, and that some benches have very few exit states which local search can use to escape. We show that the solutions (i.e., global minima) of randomly generated problem instances form clusters, which behave similarly to local minima. We revisit several enhancements of local search algorithms and explain their performance in light of our results. Finally we discuss strategies for creating the next generation of local search algorithms., Comment: See http://www.jair.org/ for any accompanying files

Published
1997

10. Heterogeneous chemistry in the troposphere: Experimental approaches and applications to the chemistry of sea salt particles

Author

De Haan, DO, Brauers, T, Oum, K, Stutz, J, Nordmeyer, T, and Finlayson-Pitts, BJ

Subjects
Chemical Physics, Physical Chemistry, Theoretical and Computational Chemistry, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Halogen atoms, particularly chlorine atoms, are well known to be highly reactive and to play a central role in the chemistry of the upper atmosphere. A large potential source of these halogens in the lower atmosphere (troposphere) exists in the form of sea salt particles. A variety of laboratory, field and modelling studies strongly suggests that there are heterogeneous reactions of sea salt particles which generate photochemically active halogen species such as Cl in marine areas. In addition, there is increasing evidence for a contribution of bromine atoms to tropospheric chemistry in marine regions at high latitudes. We review here briefly the potential importance of such halogen reactions and evidence for their role in the chemistry of the troposphere. Studies carried out in this laboratory to elucidate, at a molecular level, the mechanisms of reaction of synthetic sea salt and its components with gases of tropospheric interest are reviewed. Initial results obtained using a new aerosol apparatus recently constructed in this laboratory to study the reactions of aerosol particles above and below the deliquescence point of the salts are also discussed. © 1999 Taylor and Francis Group, LLC.

Published
1999

12. Free Radicals and Fast Photochemistry during BERLIOZ

Author

Platt, U., Alicke, B., Dubois, R., Geyer, A., Hofzumahaus, A., Holland, F., Martinez, M., Mihelcic, D., Klüpfel, T., Lohrmann, B., Pätz, W., Perner, D., Rohrer, F., Schäfer, J., Stutz, J., Seiler, W., editor, Becker, K.-H., editor, and Schaller, E., editor

Published
2002
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18. Funktionelle Analyse nach Muskeltrauma

Author

Fritz, T, Dahlem, A, Stutz, J, Pizanis, A, Körbel, C, Müller, A, Menger, M, Orth, M, Pohlemann, T, Histing, T, Fritz, T, Dahlem, A, Stutz, J, Pizanis, A, Körbel, C, Müller, A, Menger, M, Orth, M, Pohlemann, T, and Histing, T

Published
2022

20. Individual Reports from TOPAS Contributors

Author

Colin, R., Carleer, M., Guilmot, J. M., Simon, P. C., Vandaele, A. C., Hermans, C., Dufour, P., Fayt, C., Galle, Bo, Axelsson, H., Bergqvist, B., Eilard, A., Mellqvist, J., Zetterberg, L., Smith, Nicola, Coe, Hugh, Allan, Beverley, Plane, John, Stutz, J., Platt, U., Pommereau, Jean-Pierre, Goutail, Florence, Laville, Patricia, Nunes-Pinharanda, Manuel, Borrell, Peter, editor, Borrell, Patricia M., editor, Cvitaš, Tomislav, editor, Kelly, Kerry, editor, Seiler, Wolfgang, editor, Bösenberg, Jens, editor, Brassington, David J., editor, and Simon, Paul C., editor

Published
1997
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23. Einfluss von Sildenafil auf die Frakturheilung im murinen Ischämiemodell

Author

Stutz, J, Menger, M, Rollmann, M, Braun, B, Herath, S, Pohlemann, T, and Histing, T

Subjects
Osteogenese, ddc: 610, Medicine and health, Sildenafil, Frakturheilung, Ischämie, Angiogenese
Abstract

Fragestellung: Ischämie ist einer der Hauptrisikofaktoren für eine verzögerte Frakturheilung aufgrund einer verminderten Versorgung des Kallusgewebes mit Sauerstoff und Nährstoffen. In diversen Studien konnte bereits nachgewiesen werden, dass Sildenafil, ein selektiver Phosphodiesterase-5-Inhibitor, [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2021
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36. Characterization, sources and reactivity of volatile organic compounds (VOCs) in Seoul and surrounding regions during KORUS-AQ

Author

Simpson, I., Blake, D., Blake, N., Meinardi, S., Barletta, B., Hughes, S., Fleming, L., Crawford, J., Diskin, G., Emmons, L., Fried, A., Guo, H., Peterson, D., Wisthaler, A., Woo, J.-H., Barré, J., Gaubert, B., Kim, J., Kim, M., Kim, Y., Knote, C., Mikoviny, T., Pusede, S., Schroeder, J., Wang, Y., Wennberg, P., Zeng, L., Helmig, D., Stutz, J., Simpson, I., Blake, D., Blake, N., Meinardi, S., Barletta, B., Hughes, S., Fleming, L., Crawford, J., Diskin, G., Emmons, L., Fried, A., Guo, H., Peterson, D., Wisthaler, A., Woo, J.-H., Barré, J., Gaubert, B., Kim, J., Kim, M., Kim, Y., Knote, C., Mikoviny, T., Pusede, S., Schroeder, J., Wang, Y., Wennberg, P., Zeng, L., Helmig, D., and Stutz, J.

Abstract

The Korea-United States Air Quality Study (KORUS-AQ) took place in spring 2016 to better understand air pollution in Korea. In support of KORUS-AQ, 2554 whole air samples (WAS) were collected aboard the NASA DC-8 research aircraft and analyzed for 82 C1–C10 volatile organic compounds (VOCs) using multi-column gas chromatography. Together with fast-response measurements from other groups, the air samples were used to characterize the VOC composition in Seoul and surrounding regions, determine which VOCs are major ozone precursors in Seoul, and identify the sources of these reactive VOCs. (1) The WAS VOCs showed distinct signatures depending on their source origins. Air collected over Seoul had abundant ethane, propane, toluene and n-butane while plumes from the Daesan petrochemical complex were rich in ethene, C2–C6 alkanes and benzene. Carbonyl sulfide (COS), CFC-113, CFC-114, carbon tetrachloride (CCl4) and 1,2-dichloroethane were good tracers of air originating from China. CFC-11 was also elevated in air from China but was surprisingly more elevated in air over Seoul. (2) Methanol, isoprene, toluene, xylenes and ethene were strong individual contributors to OH reactivity in Seoul. However methanol contributed less to ozone formation based on photochemical box modeling, which better accounts for radical chemistry. (3) Positive Matrix Factorization (PMF) and other techniques indicated a mix of VOC source influences in Seoul, including solvents, traffic, biogenic, and long-range transport. The solvent and traffic sources were roughly equal using PMF, and the solvents source was stronger in the KORUS-AQ emission inventory. Based on PMF, ethene and propene were primarily associated with traffic, and toluene, ethylbenzene and xylenes with solvents, especially non-paint solvents for toluene and paint solvents for ethylbenzene and xylenes. This suggests that VOC control strategies in Seoul could continue to target vehicle exhaust and paint solvents, with additional regula

Published
2020
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40. Einfluss von Cilostazol auf die Frakturheilung unter Ischämiebedingungen

Author

Stutz, J, Stenger, D, Osche, D, Bremer, P, Rollmann, M, Pohlemann, T, Menger, M, and Histing, T

Subjects
ddc: 610, Frakturheilung, Ischämie, 610 Medical sciences, Medicine, Cilostazol
Abstract

Fragestellung: Eine ausreichende Vaskularisierung und Angiogenese sind entscheidende Faktoren für eine erfolgreiche Frakturheilung. Es konnte in verschiedenen Studien gezeigt werden, dass Cilostazol, ein selektiver Inhibitor der Phosphodiesterase-3, durch Stimulation pro-angiogenetischer Wachstumsfaktoren[zum vollständigen Text gelangen Sie über die oben angegebene URL], Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2018)

Published
2018
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41. Sustained Nonphotochemical Quenching Shapes the Seasonal Pattern of Solar‐Induced Fluorescence at a High‐Elevation Evergreen Forest

Author

Raczka, Brett, primary, Porcar‐Castell, A., additional, Magney, T., additional, Lee, J. E., additional, Köhler, P., additional, Frankenberg, C., additional, Grossmann, K., additional, Logan, B. A., additional, Stutz, J., additional, Blanken, P. D., additional, Burns, S. P., additional, Duarte, H., additional, Yang, X., additional, Lin, J. C., additional, and Bowling, D. R., additional

Published
2019
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43. Chemistry of Volatile Organic Compounds in the Los Angeles basin: Nighttime Removal of Alkenes and Determination of Emission Ratios

Author

De Gouw, J., Gilman, J., Kim, S.-W., Lerner, B., Isaacman-VanWertz, G., McDonald, B., Warneke, C., Kuster, W., Lefer, B., Griffith, S., Dusanter, S., Stevens, P., Stutz, J., Centre for Energy and Environment (CERI EE), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and Institut Mines-Télécom [Paris] (IMT)

Subjects
[SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017
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45. Chemistry of Volatile Organic Compounds in the Los Angeles Basin: Formation of Oxygenated Compounds and Determination of Emission Ratios

Author

de Gouw, J. A., primary, Gilman, J. B., additional, Kim, S.‐W., additional, Alvarez, S. L., additional, Dusanter, S., additional, Graus, M., additional, Griffith, S. M., additional, Isaacman‐VanWertz, G., additional, Kuster, W. C., additional, Lefer, B. L., additional, Lerner, B. M., additional, McDonald, B. C., additional, Rappenglück, B., additional, Roberts, J. M., additional, Stevens, P. S., additional, Stutz, J., additional, Thalman, R., additional, Veres, P. R., additional, Volkamer, R., additional, Warneke, C., additional, Washenfelder, R. A., additional, and Young, C. J., additional

Published
2018
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48. Reactive nitrogen partitioning and its relationship to winter ozone events in Utah

Author

Wild, R. J., Edwards, Peter, Bates, T. S., Cohen, R. C., de Gouw, J. A., Dube, W. P., Gilman, J. B., Holloway, J., Kercher, J., Koss, A., Lee, L., Lerner, B. M., McLaren, R., Quinn, P. K., Roberts, J. M., Stutz, J., Thornton, J. A., Veres, P. R., Warneke, C., Williams, E., Young, C. J., Yuan, B, Zarzana, K. J., and Brown, S.S.

Published
2016

49. Rechtsseitige Unterbauchschmerzen zwei Wochen postpartal

Author

Schwendinger M, Stutz J, Fahrni M, Michael K. Hohl, and Rahel A. Kubik-Huch

Subjects
Gynecology, medicine.medical_specialty, business.industry, Acute abdomen, medicine, General Medicine, medicine.symptom, business, Akutes abdomen
Abstract

Wir berichten über die CT-Bildgebung bei einer 33-jährigen Patientin, welche wegen seit fünf Tagen zunehmenden rechtsseitigen Unterbauchschmerzen und Schüttelfrost auf den Notfall zugewiesen wurde. Zwei Wochen zuvor hatte sie nach Einleitung in der 39. SSW problemlos entbunden. Zwei Tage postpartal wurde eine Sterilisation durchgeführt. Klinisch bestand initial der Verdacht auf eine Appendizitis. Eine zur Bestätigung der Diagnose ergänzend durchgeführte Computertomographie zeigte jedoch keine Appendizitis sondern eine rechtsseitige Ovarialvenenthrombose. Es wurde unverzüglich eine antibiotische Behandlung in Kombination mit niedermolekularem Heparin in therapeutischer Dosierung begonnen.

Published
2006
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50. Measurements of Hydroxyl and Hydroperoxy Radicals During CalNex-LA: Model Comparisons and Radical Budgets

Author

Griffith, Stephen Miles CHEM, Hansen, R.F., Dusanter, S., Michoud, V., Gilman, J.B., Kuster, W.C., Veres, P.R., Graus, M., De gouw, J.A., Roberts, J., Young, C., Washenfelder, R., Brown, S.S., Thalman, R., Waxman, E., Volkamer, R., Tsai, C., Stutz, J., Flynn, J.H., Grossberg, N., Lefer, B., Alvarez, S.L., Rappenglueck, B., Mielke, L.H., Osthoff, H.D., Stevens, P.S., Griffith, Stephen Miles CHEM, Hansen, R.F., Dusanter, S., Michoud, V., Gilman, J.B., Kuster, W.C., Veres, P.R., Graus, M., De gouw, J.A., Roberts, J., Young, C., Washenfelder, R., Brown, S.S., Thalman, R., Waxman, E., Volkamer, R., Tsai, C., Stutz, J., Flynn, J.H., Grossberg, N., Lefer, B., Alvarez, S.L., Rappenglueck, B., Mielke, L.H., Osthoff, H.D., and Stevens, P.S.

Abstract

Measurements of hydroxyl (OH) and hydroperoxy (HO2∗) radical concentrations were made at the Pasadena ground site during the CalNex-LA 2010 campaign using the laser-induced fluorescence-fluorescence assay by gas expansion technique. The measured concentrations of OH and HO2∗ exhibited a distinct weekend effect, with higher radical concentrations observed on the weekends corresponding to lower levels of nitrogen oxides (NOx). The radical measurements were compared to results from a zero-dimensional model using the Regional Atmospheric Chemical Mechanism-2 constrained by NOx and other measured trace gases. The chemical model overpredicted measured OH concentrations during the weekends by a factor of approximately 1.4 ± 0.3 (1σ), but the agreement was better during the weekdays (ratio of 1.0 ± 0.2). Model predicted HO2∗ concentrations underpredicted by a factor of 1.3 ± 0.2 on the weekends, while measured weekday concentrations were underpredicted by a factor of 3.0 ± 0.5. However, increasing the modeled OH reactivity to match the measured total OH reactivity improved the overall agreement for both OH and HO2∗ on all days. A radical budget analysis suggests that photolysis of carbonyls and formaldehyde together accounted for approximately 40% of radical initiation with photolysis of nitrous acid accounting for 30% at the measurement height and ozone photolysis contributing less than 20%. An analysis of the ozone production sensitivity reveals that during the week, ozone production was limited by volatile organic compounds throughout the day during the campaign but NOx limited during the afternoon on the weekends. ©2016. American Geophysical Union. All Rights Reserved.

Published
2016

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