603 results on '"Thomas JC"'
Search Results
2. Self-Assembled p-Carborane Analogue of p-Mercaptobenzoic Acid on Au{111}
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Thomas, JC, Boldog, I, Auluck, HS, Bereciartua, PJ, Dušek, M, Macháček, J, Bastl, Z, Weiss, PS, and Baše, T
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Materials ,Chemical Sciences ,Engineering - Abstract
The p-carborane cluster analogue of p-mercaptobenzoic acid, 1-HS-12-COOH-1,12-C2B10H10, has been synthesized and characterized using nuclear magnetic resonance spectroscopy, single-crystal X-ray diffraction analysis, quantum-chemical calculations, and scanning tunneling microscopy. The single-crystal structure and selected packing aspects are discussed and presented in comparison with the two-dimensional periodic arrangements. Scanning tunneling micrographs, recorded under ambient conditions, are used to compare pure monolayers of 1-HS-1,12-C2B10H11 to coadsorbed monolayers of both the parental precursor and carboxyl-functionalized p-carboranethiolate on Au{111}. Monolayers of both constituents are further characterized by X-ray photoelectron spectroscopy, which shows good agreement between the stoichiometry of each pure monolayer and the nominal stoichiometries of the respective molecules. Results indicate that most of the molecules of both derivatives adsorb as thiolates but that a small fraction of each adsorbs as thiols, without complete SH bond scission, and consequently are labile relative to desorption. Wetting-angle measurements confirm the hydrophilic character of monolayers containing the carboxylic acid constituents. Mixed self-assembled monolayers with functionalized constituents of high axial symmetry provide a convenient basis for grafting two- and three-dimensional structures. (Figure Presented).
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- 2015
3. Autonomous scanning probe microscopy investigations over WS2 and Au{111}
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Thomas, JC, Thomas, JC, Rossi, A, Smalley, D, Francaviglia, L, Yu, Z, Zhang, T, Kumari, S, Robinson, JA, Terrones, M, Ishigami, M, Rotenberg, E, Barnard, ES, Raja, A, Wong, E, Ogletree, DF, Noack, MM, Weber-Bargioni, A, Thomas, JC, Thomas, JC, Rossi, A, Smalley, D, Francaviglia, L, Yu, Z, Zhang, T, Kumari, S, Robinson, JA, Terrones, M, Ishigami, M, Rotenberg, E, Barnard, ES, Raja, A, Wong, E, Ogletree, DF, Noack, MM, and Weber-Bargioni, A
- Abstract
Individual atomic defects in 2D materials impact their macroscopic functionality. Correlating the interplay is challenging, however, intelligent hyperspectral scanning tunneling spectroscopy (STS) mapping provides a feasible solution to this technically difficult and time consuming problem. Here, dense spectroscopic volume is collected autonomously via Gaussian process regression, where convolutional neural networks are used in tandem for spectral identification. Acquired data enable defect segmentation, and a workflow is provided for machine-driven decision making during experimentation with capability for user customization. We provide a means towards autonomous experimentation for the benefit of both enhanced reproducibility and user-accessibility. Hyperspectral investigations on WS2 sulfur vacancy sites are explored, which is combined with local density of states confirmation on the Au{111} herringbone reconstruction. Chalcogen vacancies, pristine WS2, Au face-centered cubic, and Au hexagonal close-packed regions are examined and detected by machine learning methods to demonstrate the potential of artificial intelligence for hyperspectral STS mapping.
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- 2022
4. Challenges in low losses and large acceptance ion beam transport
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Osswald, F., Traykov, E., Durand, T., Heine, M., Michaud, J., Thomas, JC., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), GIP ARRONAX [Nantes], Université de Nantes (UN), Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
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Beam losses ,Accelerator Physics (physics.acc-ph) ,Ion-beam transport ,Beam Optics ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,Large acceptance ,Beam emittance ,FOS: Physical sciences ,Physics - Accelerator Physics ,Beam halo - Abstract
A prototype of ion beam transport module has been developed at the Institut Pluridisciplinaire Hubert Curien (IPHC) and used as a test bed to investigate key issues related to the efficient transport of ion beams. This includes the reduction of the beam losses, the increase of the acceptance, and the definition of the instrumentation necessary to evaluate the performances. An experiment was performed on a full-scale beam line and following a standard beam analysis, steering, and focusing procedure. After a review of the developments carried out for some demanding facilities and for the design of the quadrupoles implemented in the transport module, the paper highlights the challenge of measuring the preservation of transverse phase-space distributions with large acceptance conditions, i.e. with the highest ratio of beam filling to quadrupole aperture. Then, the tolerance to the errors and mitigation of the risks are discussed, in particular by considering the electric stability of the transport module, beam trips, behavior of the tail and the halo, and misalignment errors., arXiv admin note: substantial text overlap with arXiv:2211.09611
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- 2023
5. Understanding the effectiveness of different exercise training programme designs on V?O2peak in COPD: a component network meta- analysis.
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Ward, Thomas JC, Plumptre, Charles D., Pye, Alessandra V. Fraser, Dolmage, Thomas E., Jones, Amy V., Trethewey, Ruth, Latimer, Lorna, Singh, Sally J., Lindley, Martin R., Steiner, Michael C., and Evans, Rachael A.
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EXERCISE therapy ,SMOKING cessation ,CHRONIC obstructive pulmonary disease ,AEROBIC exercises ,STAIR climbing - Published
- 2023
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6. An immune cell lipid atlas reveals the basis of susceptibility to ferroptosis
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Pernes, Gerard, primary, Morgan, Pooranee K, additional, Huynh, Kevin, additional, Giles, Corey, additional, Paul, Sudip, additional, Smith, Adam Alexander T, additional, Mellett, Natalie A, additional, Veiga, Camilla Bertuzzo, additional, Collins, Thomas JC, additional, De Silva, T Michael, additional, Lee, Man KS, additional, Meikle, Peter J, additional, Lancaster, Graeme I, additional, and Murphy, Andrew J, additional
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- 2023
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7. An immune cell lipid atlas reveals the basis of susceptibility to ferroptosis
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Gerard Pernes, Pooranee K Morgan, Kevin Huynh, Corey Giles, Sudip Paul, Adam Alexander T Smith, Natalie A Mellett, Camilla Bertuzzo Veiga, Thomas JC Collins, T Michael De Silva, Man KS Lee, Peter J Meikle, Graeme I Lancaster, and Andrew J Murphy
- Abstract
The cellular lipidome is comprised of thousands of unique lipid species. This complexity underpins the many roles of lipids in cellular biology. How lipidome composition varies between cell types and how such differences contribute to cell-specific functionality is poorly understood. Here, using mass spectrometry-based targeted lipidomics, we have characterised the cellular lipid landscape of the human and mouse immune systems (www.cellularlipidatlas.com). We find that myeloid and lymphoid cell lineages have unique lipid compositions, notably in the usage of ester and ether bonds within glycerophospholipids (PLs) and PL acyl chain composition. To determine if immune cell-specific lipid phenotypes promote cell-specific functional properties we focused on differences in poly-unsaturated fatty acid (PUFA)-containing PL, the levels of which are markedly higher in lymphoid cells relative to myeloid cells. We firstly show that differences in PUFA-PL content provides a mechanistic basis for previously described differences in immune cell susceptibility to ferroptosis, a form of cell death driven by iron-dependent lipid peroxidation, and secondly, that the low PUFA-PL content of neutrophils restrains NADPH oxidase-driven ferroptosis. In summary, we show that the lipid landscape is a defining feature of immune cell identity and that cell-specific lipid phenotypes underpin aspects of immune cell physiology.
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- 2023
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8. EE51 Analysis of Direct Costs of Treating Severe Hemophilia A in Brazil
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Ozelo, MC, Yamaguti-Hayakawa, G.G., Ramos, TRM, Thomas, JC, and Jain, M
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- 2024
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9. Outcomes from a virtual ward delivering oxygen at home for patients recovering from COVID-19: a real world observational study
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Ward, Thomas JC, primary, Mavilakandy, Akash, additional, Danns, Julie, additional, Tsaknis, Georgios, additional, and Reddy, Raja V, additional
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- 2022
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10. Understanding the effectiveness of different exercise training programme designs on V̇O2peakin COPD: a component network meta-analysis
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Ward, Thomas JC, Plumptre, Charles D, Fraser-Pye, Alessandra V, Dolmage, Thomas E, Jones, Amy V, Trethewey, Ruth, Latimer, Lorna, Singh, Sally J, Lindley, Martin R, Steiner, Michael C, and Evans, Rachael A
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Pulmonary rehabilitation programmes including aerobic training improve cardiorespiratory fitness in patients with COPD, but the optimal programme design is unclear. We used random effects additive component network meta-analysis to investigate the relative effectiveness of different programme components on fitness measured by V̇O2peakin COPD. The included 59 studies involving 2191 participants demonstrated that V̇O2peakincreased after aerobic training of at least moderate intensity with the greatest improvement seen following high intensity training. Lower limb aerobic training (SMD 0.56 95% CI 0.32;0.81, intervention arms=86) and the addition of non-invasive ventilation (SMD 0.55 95% CI 0.04;1.06, intervention arms=4) appeared to offer additional benefit but there was limited evidence for effectiveness of other exercise and non-exercise components.
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- 2023
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11. Beyond convenience: practical considerations with using routine health data for evaluations
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Watson-Grant, S, primary, Sutherland, EG, additional, Xiong, K, additional, and Thomas, JC, additional
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- 2020
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12. Effect of Sodic Irrigation Water on Organic Carbon and Nitrogen Concentrations, Fluxes and Exports from Newly Installed St. Augustine Grass Sod in South-Central Texas
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Fontanier Ch, Wherley Bg, McInnes K, Aitkenhead-Peterson Ja, White Rh, and Thomas Jc
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Total organic carbon ,Blackwater ,010504 meteorology & atmospheric sciences ,biology ,Stenotaphrum ,St. Augustine Grass ,010501 environmental sciences ,biology.organism_classification ,01 natural sciences ,Tap water ,Agronomy ,Dissolved organic carbon ,Environmental science ,Water quality ,Surface runoff ,0105 earth and related environmental sciences - Abstract
Population growth in towns and cities requires new construction of homes and conversion of native land use to urban and suburban landscapes. Municipal tap water is generally used for irrigating these urban and suburban landscapes and its water quality can differ globally dependent on whether it is sourced from ground or surface waters. We examined runoff dissolved organic carbon (DOC) and organic nitrogen (DON) concentrations, fluxes and exports from newly installed, fertilized and unfertilized St. Augustine (Stenotaphrum secundatum (Walt.) Kuntze ‘Raleigh’) sod irrigated with a sodic municipal tap water during two 5-week establishment periods (August and September). In unfertilized plots, concentrations of DOC in runoff significantly increased from 20.5 to 73.7 mg L-1 and from 29.6 to 113.3 mg L-1 Runoff concentrations of DOC in fertilized plots significantly increased from 27.3 to 72.0 mg L-1 and from 30.0 to 120.3 mg L-1. Concentrations of DON in runoff did not increase in either unfertilized or fertilized plots. Total DOC exports were 2036 ± 803 kg km-2 and 3341 ± 227 kg km-2 and DON exports were 99 ± 43 kg km-2 and 134 ± 15 kg km-2 respectively for the two turfgrass installation dates for the unfertilized plots. Fertilization had no significant effect on DOC and DON exports (p = 0.29 and 0.18). Na+, K+, Mg2+ and Ca2+ were implicated in both DOC and DON fluxes suggesting that as resources for irrigation water for urban landscapes decline and alternative irrigation water supplies such as grey and black water are utilized we would expect, due to their higher Na+ content that DOC and DON fluxes to urban watersheds will increase.
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- 2018
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13. Spectroscopy of Fe-61 via the neutron transfer reaction H-2(Fe-60, p)Fe-61
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Giron, S, Hammache, F, de Sereville, N, Roussel, P, Burgunder, J, Moukaddam, M, Beaumel, D, Caceres, L, Duchene, G, Clement, E, Fernandez-Dominguez, B, Flavigny, F, de France, G, Franchoo, S, Galaviz-Redondo, D, Gasques, L, Gibelin, J, Gillibert, A, Grevy, S, Guillot, J, Heil, M, Kiener, J, Lapoux, V, Marechal, F, Matta, A, Matea, I, Nalpas, L, Pancin, J, Perrot, L, Obertelli, A, Raabe, Riccardo, Scarpaci, JA, Sieja, K, Sorlin, O, Stefan, I, Stodel, C, Takechi, M, Thomas, JC, and Togano, Y
- Abstract
The direct component of the 60Fe(n,γ)61Fe cross section was investigated by populating the bound states of the 61Fe nucleus through the (d,pγ) transfer reaction in inverse kinematics using a radioactive beam of 60Fe at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in the EXOGAM γ-ray detectors. For the first time, the spectroscopic factors of the first 3/2−, 5/2−, 1/2−, and 9/2+ states of 61Fe were deduced experimentally from an adiabatic distorted wave approximation analysis of the data. The obtained results show a very good agreement with the shell-model predictions. The calculated direct component of the (n,γ) cross section was found negligible and of about 2% of the total, indicating a dominant resonant component. ispartof: Physical Review C vol:95 issue:3 status: published
- Published
- 2017
14. Coulomb excitation of Ca-44 and Ar-46
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Calinescu, S, Caceres, L, Grevy, S, Sorlin, O, Dombradi, Z, Stanoiu, M, Astabatyan, R, Borcea, C, Borcea, R, Bowry, M, Catford, Wilton, Clement, E, Franchoo, S, Garcia, R, Gillibert, R, Guerin, IH, Kuti, I, Lukyanov, S, Lepailleur, A, Maslov, V, Morfouace, P, Mrazek, J, Negoita, F, Niikura, M, Perrot, L, Podolyak, Zsolt, Petrone, C, Penionzhkevich, Y, Roger, T, Rotaru, F, Sohler, D, Stefan, I, Thomas, JC, Vajta, Z, and Wilson, E
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The reduced transition probabilities B(E2; 0+ g.s. → 2+ 1 ) of the 46Ar and 44Ca nuclei were studied using the Coulomb excitation technique at intermediate energy at the LISE/GANIL facility. The in-flight γ rays, emitted after the Coulomb excitation of their first 2+ states, were detected in an array of 64 BaF2 crystals. The present B(E2 ↑) value for 44Ca, 475(36) e2fm4 , agrees well with the value of 495(35) e2fm4 obtained by averaging results of previous experiments. Consistent B(E2; 0+ g.s. → 2+ 1 ) values of 225(29) e2fm4 and 234(19) e2fm4 have been obtained for 46Ar from an absolute and a relative measurement, normalized to the 44Ca value. Both results agree with the ones obtained with the same experimental technique at the NSCL facility but are a factor of 2 smaller than the shell model predictions. The drop in B(E2; 0+ g.s. → 2+ 1 ) in the Ar chain at N = 28, confirmed in this experiment, shows that 46Ar is sensitive to the N = 28 shell closure.
- Published
- 2016
15. High-precision half-life measurements of the T=1/2 mirror beta decays F-17 and Cl-33
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Grinyer, J, Grinyer, GF, Babo, Mathieu, Bouzomita, H, Chauveau, P, Delahaye, P, Dubois, M, Frigot, R, Jardin, P, Leboucher, C, Maunoury, L, Seiffert, C, Thomas, JC, and Traykov, E
- Abstract
Background: Measurements of the ft values for T=1/2 mirror β+ decays offer a method to test the conserved vector current hypothesis and to determine Vud, the up-down matrix element of the Cabibbo-Kobayashi-Maskawa matrix. In most mirror decays used for these tests, uncertainties in the ft values are dominated by the uncertainties in the half-lives. Purpose: Two precision half-life measurements were performed for the T=1/2β+ emitters, 17F and 33Cl, in order to eliminate the half-life as the leading source of uncertainty in their ft values. Method: Half-lives of 17F and 33Cl were determined using β counting of implanted radioactive ion beam samples on a moving tape transport system at the Système de Production d'Ions Radioactifs Accélérés en Ligne low-energy identification station at the Grand Accélérateur National d'Ions Lourds. Results: The 17F half-life result, 64.347 (35) s, precise to ±0.05%, is a factor of 5 times more precise than the previous world average. The half-life of 33Cl was determined to be 2.5038 (22) s. The current precision of ±0.09% is nearly 2 times more precise compared to the previous world average. Conclusions: The precision achieved during the present measurements implies that the half-life no longer dominates the uncertainty of the ft values for both T=1/2 mirror decays 17F and 33Cl. ispartof: Physical Review C vol:92 issue:4 status: published
- Published
- 2015
16. Isoscalar response of Ni-68 to alpha-particle and deuteron probes
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Vandebrouck, M, Gibelin, J, Khan, E, Achouri, NL, Baba, H, Beaumel, D, Blumenfeld, Y, Caamano, M, Caceres, L, Colo, G, Delaunay, F, Fernandez-Dominguez, B, Garg, U, Grinyer, GF, Harakeh, MN, Kalantar-Nayestanaki, N, Keeley, N, Mittig, W, Pancin, J, Raabe, Riccardo, Roger, T, Roussel-Chomaz, P, Savajols, H, Sorlin, O, Stodel, C, Suzuki, D, Thomas, JC, and Research unit Nuclear & Hadron Physics
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Nuclear Theory ,ACTIVE TARGET ,STRENGTH ,DETECTORS ,PROGRAM ,NI ISOTOPES ,SCATTERING ,DIPOLE RESONANCE ,NUCLEAR-PHYSICS ,ELECTRON ,Nuclear Experiment - Abstract
Isoscalar giant resonances have been measured in the unstable 68Ni nucleus using inelastic alpha and deuteron scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. Using alpha scattering, the extracted isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 MeV and the isoscalar giant quadrupole resonance (ISGQR) to be 15.9 ± 1.3 MeV. Indications for soft isoscalar monopole and dipole modes are provided. Results obtained with both (α,α′) and (d,d′) probes are compatible. The evolution of isoscalar giant resonances along the Ni isotopic chain from 56Ni to 68Ni is discussed. ispartof: Physical Review C vol:92 issue:2 status: published
- Published
- 2015
17. Defect-Tolerant Aligned Dipoles within Two-Dimensional Plastic Lattices
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Thomas, JC, Schwartz, JJ, Hohman, JN, Claridge, SA, Auluck, HS, Serino, AC, Spokoyny, AM, Tran, G, Kelly, KF, Mirkin, CA, Gilles, J, Osher, SJ, and Weiss, PS
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carborane ,two-dimensional ,self-assembled monolayer ,dipole alignment ,ferroelectric ,scanning tunneling microscopy ,Physics::Atomic Physics ,self-assembly ,nanoscience ,Nanoscience & Nanotechnology ,defect tolerant - Abstract
© 2015 American Chemical Society. Carboranethiol molecules self-assemble into upright molecular monolayers on Au{111} with aligned dipoles in two dimensions. The positions and offsets of each molecule's geometric apex and local dipole moment are measured and correlated with sub-Ångström precision. Juxtaposing simultaneously acquired images, we observe monodirectional offsets between the molecular apexes and dipole extrema. We determine dipole orientations using efficient new image analysis techniques and find aligned dipoles to be highly defect tolerant, crossing molecular domain boundaries and substrate step edges. The alignment observed, consistent with Monte Carlo simulations, forms through favorable intermolecular dipole-dipole interactions.
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- 2015
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18. Measurement of the Isoscalar Monopole Response in the Neutron-Rich Nucleus Ni-68
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Vandebrouck, M, Gibelin, J, Achouri, NL, Baba, H, Beaumel, D, Blumenfeld, Y, Caamano, M, Caceres, L, Colo, G, Delaunay, F, Fernandez-Dominguez, B, Garg, U, Grinyer, GF, Harakeh, MN, Kalantar-Nayestanaki, N, Keeley, N, Mittig, W, Pancin, J, Raabe, Riccardo, Roger, T, Roussel-Chomaz, P, Savajols, H, Sorlin, O, Stodel, C, Suzuki, D, Thomas, JC, and Khan, E
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Nuclear Theory ,Nuclear Experiment - Abstract
The isoscalar monopole response has been measured in the unstable nucleus (68)Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 ± 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L=0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei. ispartof: Physical Review Letters vol:113 issue:3 ispartof: location:United States status: published
- Published
- 2014
19. Shared responsibility for the common good: Measuring public value across institutional boundaries
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Bryson, JM, Crosby, BC, Bloomberg, L, Hartley, J, Alford, J, Hughes, O, Sandfort, J, Quick, K, Belfield, C, Moore, M, Meynhardt, T, Thomas, JC, Poister, TH, Su, M, Kroll, A, Moynihan, DP, Cresswell, AM, Cook, M, Helbig, N, Guarini, E, Guarini, E, GUARINI, ENRICO, Bryson, JM, Crosby, BC, Bloomberg, L, Hartley, J, Alford, J, Hughes, O, Sandfort, J, Quick, K, Belfield, C, Moore, M, Meynhardt, T, Thomas, JC, Poister, TH, Su, M, Kroll, A, Moynihan, DP, Cresswell, AM, Cook, M, Helbig, N, Guarini, E, Guarini, E, and GUARINI, ENRICO
- Abstract
Public management research has paid increasing attention to the public value paradigm. Despite the number of studies on the topic, we do not yet have a comprehensive empirical understanding of what happens when the public value paradigm is translated into performance measurement regimes and models. A major issue here is how to integrate public value measurement across networks of business, civil society, and government within which public policies and services are implemented these days. By looking for implications for public management, this chapter aims to offer a set of preliminary answers to the question of how governments themselves should shape policymaking, performance measurement, and reporting in order to integrate the contribution of civil society and private business to public value creation. Presented in this chapter are the results from a case study of a regional government in Italy experiencing boundary- crossing public value measurement and reporting. The goal of the research was to collect information about how measurement efforts at the local level reflect public value creation in a networked setting, about the process that was used for community engagement, and about the extent to which the process to develop public value measurement and reporting is relevant for public and private leaders. As a conclusion, some implications for public management and governance are emphasized.
- Published
- 2015
20. Improved half-life determination and beta-delayed gamma-ray spectroscopy for Ne-18 decay
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Grinyer, GF, Ball, GC, Bouzomita, H, Ettenauer, S, Finlay, Paul, Garnsworthy, AB, Garrett, PE, Green, KL, Hackman, G, Leslie, JR, Pearson, CJ, Rand, ET, Sumithrarachchi, CS, Svensson, CE, Thomas, JC, Triambak, S, and Williams, SJ
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half-life ,18Ne - Abstract
The half-life of the superallowed Fermi β+ emitter 18Ne has been determined to ±0.07% precision by counting 1042 keV delayed γ rays that follow approximately 8% of all β decays. The deduced half-life, T1/2 = 1.6648 (11) s, includes a 0.7%correction that accounts for systematic losses associated with rate-dependent detector pulse pileup that was determined using a recently developed γ -ray photopeak-counting technique. This result is a factor of two times more precise than, and in excellent agreement with, a previous lower-statistics measurement that employed the same experimental setup. High-resolution β-delayed γ-ray spectroscopy results for the relative γ-ray intensities and β-decay branching ratios to excited states in the daughter 18F are also presented. ispartof: Physical Review C, Nuclear Physics vol:87 issue:4 status: published
- Published
- 2013
21. g factor of the exotic N=21 isotope Al-34: probing the N=20 and N=28 shell gaps at the border of the 'island of inversion'
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Himpe, P, Neyens, Gerda, Balabanski, DL, Belier, G, Daugas, JM, de Oliveira Santos, F, De Rydt, Marieke, Flanagan, KT, Matea, I, Morel, P, Penionzhkevich, Yu E, Perrot, L, Smirnova, NA, Stodel, C, Thomas, JC, Vermeulen, Nele, Yordanov, DT, Utsuno, Y, and Otsuka, T
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MODEL ,fragmentation reaction ,magnetic moment ,Physics and Astronomy ,GROUND-STATE ,MG-32 ,CLOSURE ,SPECTROMETER ,island of inversion ,NUCLEAR MOMENTS ,34Al g-factor - Abstract
For the first time the g factor of an isotope beyond N = 20 near the 'island of inversion' has been measured. A Al-34 radioactive beam was produced in a one-neutron pickup reaction on a S-36 primary beam at 77.5 MeV/u, providing a large spin-polarization for application of the P-Nuclear Magnetic Resonance (beta-NMR) method. The measured g factor of Al-34 vertical bar g vertical bar = 0.539(2), combined with results from earlier beta-decay studies, allows to firmly assign a ground state spin/parity 4(-). Comparison to large scale shell model calculations reveals that a dominant amount of intruder components is needed in the Al-34 wave function to account for the observed large magnetic moment mu = (+)2.156(16)mu(N). This reveals Z = 13 to be a true 'transition number' between the normal Z = 14 Si isotopes and the abnormal Z = 12 Mg isotopes. The sensitivity of this odd-odd ground state dipole moment to the N = 20, as well as the N = 28 gap, reveals that both are significantly reduced, despite Z = 13 being outside the conventional island of inversion. (c) 2007 Elsevier B.V. All rights reserved. ispartof: Physics Letters B vol:658 issue:5 pages:203-208 status: published
- Published
- 2008
22. Diversity and evolution of phycobilisomes in marine Synechococcus spp.: A comparative genomics study
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Six, C, Thomas, JC, Garczarek, L, Ostrowski, M, Dufresne, A, Blot, N, Scanlan, DJ, Partensky, F, Six, C, Thomas, JC, Garczarek, L, Ostrowski, M, Dufresne, A, Blot, N, Scanlan, DJ, and Partensky, F
- Abstract
Background: Marine Synechococcus owe their specific vivid color (ranging from blue-green to orange) to their large extrinsic antenna complexes called phycobilisomes, comprising a central allophycocyanin core and rods of variable phycobiliprotein composition. Three major pigment types can be defined depending on the major phycobiliprotein found in the rods (phycocyanin, phycoerythrin I or phycoerythrin II). Among strains containing both phycoerythrins I and II, four subtypes can be distinguished based on the ratio of the two chromophores bound to these phycobiliproteins. Genomes of eleven marine Synechococcus strains recently became available with one to four strains per pigment type or subtype, allowing an unprecedented comparative genomics study of genes involved in phycobilisome metabolism. Results: By carefully comparing the Synechococcus genomes, we have retrieved candidate genes potentially required for the synthesis of phycobiliproteins in each pigment type. This includes linker polypeptides, phycobilin lyases and a number of novel genes of uncharacterized function. Interestingly, strains belonging to a given pigment type have similar phycobilisome gene complements and organization, independent of the core genome phylogeny (as assessed using concatenated ribosomal proteins). While phylogenetic trees based on concatenated allophycocyanin protein sequences are congruent with the latter, those based on phycocyanin and phycoerythrin notably differ and match the Synechococcus pigment types. Conclusion: We conclude that the phycobilisome core has likely evolved together with the core genome, while rods must have evolved independently, possibly by lateral transfer of phycobilisome rod genes or gene clusters between Synechococcus strains, either via viruses or by natural transformation, allowing rapid adaptation to a variety of light niches. © 2007 Six et al.; licensee BioMed Central Ltd.
- Published
- 2007
23. Gerstenhaber duality in Hochschild cohomology
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Menichi, L, Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Menichi, L, and Thomas, JC.
- Abstract
Let C be a differential graded chain coalgebra, &UOmega; C the reduced cobar construction on C and C-V the dual algebra. We prove that for a large class of coalgebras C there is a natural isomorphism of Gerstenhaber algebras between the Hochschild cohomologies, HH*(C-V, C-V) and HH*(&UOmega; C; &UOmega; C). This result yields to a Hodge decomposition of the loop space homology of a closed oriented manifold, when the field of coefficients is of characteristic zero. © 2004 Elsevier B.V. All rights reserved.
- Published
- 2005
24. Application of a thin double-sided microstrip detector for the registration of beta-delayed charge particles: The He-6 beta decay into the two-body continuum of Li-6
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UCL - Autre, Smirnov, D., Aksouh, F., Dean, S, De Witte, H, Huyse, M., Ivanov, O., Mayet, P, Mukha, I., Raabe, R., Thomas, JC., Van Duppen, P., Angulo, C., Cabrera Jamoulle, Juan, Ninane, Alain, Davinson, T., UCL - Autre, Smirnov, D., Aksouh, F., Dean, S, De Witte, H, Huyse, M., Ivanov, O., Mayet, P, Mukha, I., Raabe, R., Thomas, JC., Van Duppen, P., Angulo, C., Cabrera Jamoulle, Juan, Ninane, Alain, and Davinson, T.
- Abstract
We present a method for the detection of charged particles. emitted following beta decay, that allows to reduce the background due to beta radiation and thus to facilitate separation of the delayed-particle events, The isotopes of interest are implanted into a highly segmented double-sided silicon strip detector, resulting in excellent precision on the overall normalisation. The characteristics of the detector and the particle signatures are discussed, This method can be applied to a variety of systems close to the proton and neutron driplines. it region which the recent availability of post-accelerated radioactive beams has opened up for study. To demonstrate this, we measured the branching ratio of He-6 beta decay into the alpha + d two-body continuum of Li-6. We obtained it Value of(1.7 +/- 04) x 10(-6) for energies x + d above 525 keV. (c) 2005 Elsevier B.V. All rights reserved.
- Published
- 2005
25. The Hochschild cohomology of a closed manifold
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., Vigue-Poirrier, M, UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., and Vigue-Poirrier, M
- Abstract
Let M be a closed orientable manifold of dimension d and l*(M) be the usual cochain algebra on M with coefficients in a field k. The Hochschild cohomology of M, HH* (l* (M); l* (M)) is a graded commutative and associative algebra. The augmentation map E : l* (M) -> k induces a morphism of algebras I : HH* (l* (M); l* (M)) -> HH* (l* (M); k). In this paper we produce a chain model for the morphism I. We show that the kernel of I is a nilpotent ideal and that the image of I is contained in the center of HH*(l*(M); k), which is in general quite small. The algebra HH*(l*(M); l*(M)) is expected to be isomorphic to the loop homology constructed by Chas and Sullivan. Thus our results would be translated in terms of string homology.
- Published
- 2004
26. Monoid of self-equivalences and free loop spaces
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, and Thomas, JC.
- Abstract
Let M be a simply-connected closed oriented N-dimensional manifold. We prove that for any field of coefficients lk there exists a natural homomorphism of commutative graded algebras Gamma : H-*(Omega aut(1)M) --> H*(M-S1) where H-*(M-S1) = H*+N(M-S1) is the loop algebra defined by Chas and Sullivan. As usual aut(1)X denotes the monoid of self-equivalences homotopic to the identity, and OmegaX the space of based loops. When lk is of characteristic zero, Gamma yields isomorphisms H-(1)(n+N) (M-S1) congruent to (pi(n)(Omegaaut(1)M) x lk)(boolean OR) where +(infinity)(l=1) H-(l)(n)(M-S1) denotes the Hodge decomposition on H*(M-S1).
- Published
- 2004
27. Graded lie algebras with finite polydepth
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
If A is a graded connected algebra then we define a new invariant, polydepth A, which is finite if Ext*(A) (M, A) not equal 0 for some A-module M of at most polynomial growth. THEOREM 1: If f : X --> Y is a continuous map of finite category, and if the orbits of H*(OmegaY) acting in the homology of the homotopy fibre grow at most polynomially, then H*(OmegaY) has finite polydepth. THEOREM 5: If L is a graded Lie algebra and polydepth UL is finite then either L is solvable and UL grows at most polynomially or else for some integer d and all r, Sigma(i=k+1)(k+d) dim L-i greater than or equal to V, k greater than or equal to some k(r). (C) 2003 Elsevier SAS.
- Published
- 2003
28. Lusternik-Schnirelmann category of skeleta
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
In this paper we make explicit the relationship between the category of a connected CW complex and the category of its skeleta. In particular we prove that if Y is a connected non-contractible CW complex, then cat Y-k less than or equal to cat Y for each k-skeleton Y-k. On the other hand, we prove that cat(0)(Y) = lim(k-->infinity) cat(0)(Y-k), where cat(0) denotes the rational category of the space. (C) 2001 Elsevier Science B.V. All rights reserved.
- Published
- 2002
29. The Serre spectral sequence of a multiplicative fibration
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
In a fibration OmegaF (Omegaj)under right arrow OmegaX (Omega pi )under right arrow OmegaB we show that finiteness conditions on F force the homology Serre spectral sequence with F-p-coefficients to collapse at some finite term. This in particular implies that as graded vector spaces, H-*(OmegaX) is "almost" isomorphic to H-*(OmegaB) circle times H-*(OmegaF). One consequence is the conclusion that X is elliptic if and only if B and F are.
- Published
- 2001
30. Photophysiology of the marine cyanobacterium Synechococcus sp. WH8102, a new model organism
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Six, C, primary, Thomas, JC, additional, Brahamsha, B, additional, Lemoine, Y, additional, and Partensky, F, additional
- Published
- 2004
- Full Text
- View/download PDF
31. Disparity between whites and african-americans in knowledge and treatment of cholesterol
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Thomas, JC, primary, Lackland, DT, additional, and Taylor, KB, additional
- Published
- 2000
- Full Text
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32. Factors associated with periodontitis in an HIV‐infected Southeast USA study
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McKaig, RG, primary, Patton, LL, additional, Thomas, JC, additional, Strauss, RP, additional, Slade, GD, additional, and Beck, JD, additional
- Published
- 2000
- Full Text
- View/download PDF
33. [Homology of Spaces of Strings of Configuration-spaces]
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, and Thomas, JC.
- Abstract
We compute the loop space homology of the space F(M,k) of configurations of k points in a compact simply connected manifold M. We prove in particular that, if H* (M, Q) is not generated by one generator, then the rational homology of OMEGAF (M, k) contains a tensor algebra for k greater-than-or-equal-to 2.
- Published
- 1994
34. Hopf-algebras and a Counterexample To a Conjecture of Anick
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
Let A be a graded algebra of finite type over a field K. Anick has conjectured that if A has finite global dimension then A is linearly isomorphic to a graded polynomial algebra. When the ground field has odd characteristic we give a counterexample which is a cocommutative graded Hopf algebra. We also show that in this context the conjecture is true in characteristic zero or two and is almost true in odd characteristic. We propose a companion conjecture for Ext A(K, K) and prove it when A = UL, some graded Lie algebra L. (C) 1994 Academic Press, Inc.
- Published
- 1994
35. L'application d'évaluation, les groupes de Gotlieb duaux et les cellules terminales
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Lemaire, JM., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Lemaire, JM., and Thomas, JC.
- Abstract
We compare three natural subvectorspaces of the cohomology of a simply connected pointed space. These spaces are related to, respectively, the ''last cells'' of the space, the ''dual Gottlieb groups'' and the ''evaluation map'' defined by the Spivak construction.
- Published
- 1994
36. British Dental Journal
- Author
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Kwan, SYL, primary, McKaig, RG, additional, Thomas, JC, additional, ten Berge, M, additional, Veerkamp, J, additional, Kan, JYK, additional, and Rungcharassaeng, K, additional
- Published
- 1999
- Full Text
- View/download PDF
37. On the Homology of Postnikov Fibers
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, and Thomas, JC.
- Abstract
Let k be a field of positive characteristic and X be a simply connected space of the homotopy type of a finite type CW complex. The Postnikov fibre X([n]) of X is defined as the homotopy fibre of the n-equivalence fn: X --> X(n) coming from the Postnikov tower {X(n)} of X. We prove that if the Lusternik-Schnirelmann category of X is finite, then H*(X[n];k) contains a free module on a subalgebra K of H* (OMEGAX(n);k) such that H* (OMEGAX(n);k) is a finite-dimensional free K-module.
- Published
- 1993
38. Homology and Homotopy-groups of Mapping Spaces At Large Primes
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, and Thomas, JC.
- Published
- 1993
39. The Category of a Map and the Grade of a Module
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
Let f : Y --> X be a continuous map between connected CW complexes. The homology H* (F) of the homotopy fibre is then a module over the loop space homology H* (OMEGAX). THEOREM: If H*(F; R) and H*(OMEGAX; R) are R-free (R a principal ideal domain) then for some H*(OMEGAX; R)-projective module P=P(greater-than-or-equal-to 0) and for some m less-than-or-equal-to cat f: Ext(H* (OMEGAX)m(H* (F); P) not-equal 0. Some applications are also given.
- Published
- 1992
40. Torsion in Loop Space Homology
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Published
- 1992
41. Beyond convenience: practical considerations with using routine health data for evaluations.
- Author
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Watson-Grant, S, Sutherland, EG, Xiong, K, Thomas, JC, Sutherland, E G, and Thomas, J C
- Abstract
Routine health information systems (RHIS) comprise data collected at regular intervals at public, private, and community-level health facilities and institutions and health programs. A central concern of using routine data for research and evaluations is whether the data can be trusted and whether the data systems and the data stewards are trustworthy. [Extracted from the article]
- Published
- 2021
- Full Text
- View/download PDF
42. Lie-algebras of Polynomial-growth
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
Kac has introduced the notion of (polynomial) growth for a graded Lie algebra. Here we consider Lie algebras L that occur as ideals either in the rational homotopy Lie algebra of a simply connected CW complex of finite type and finite category or as ideals in the homotopy Lie algebra of a local noetherian ring. Theorem. If these ideals have (finite) polynomial growth, then they are finite dimensional.
- Published
- 1991
43. Elliptic Hopf-algebras
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Abstract
An elliptic Hopf algebra is a connected graded cocommutative Hopf algebra that is finitely generated and nilpotent. If (A,m,k) is a local noetherian ring then Ext(A)(k; k) is elliptic if and only A is a complete intersection. Similarly, special conditions are imposed on a simply connected topological space X if H*(OMEGA-X; k) is elliptic. Elliptic Hopf algebras G have finite depth and we show that they are characterized among Hopf algebras of finite depth by any of the following three properties: (i) SIGMA-i less-than-or-equal-to n dim G(i) grows at most polynomially in n; (ii) G is left noetherian; (iii) G is nilpotent.
- Published
- 1991
44. Engel Elements in the Homotopy Lie-algebra
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Published
- 1991
45. Free Loop-spaces of Finite Complexes Have Infinite Category
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., Viguepoirrier, M., UCL - SC/MATH - Département de mathématique, Félix, Yves, Thomas, JC., and Viguepoirrier, M.
- Abstract
Let X be a 1-connected space such that each H(j)(X;Z) is finitely generated. In this paper we prove that if the reduced homology of X with coefficients in a field is nonzero, then the Lusternik-Schnirelmann category of the free loop space is infinite.
- Published
- 1991
46. Loop Space Homology of Spaces of Ls Category One and 2
- Author
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UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., Thomas, JC., UCL - SC/MATH - Département de mathématique, Félix, Yves, Halperin, S., and Thomas, JC.
- Published
- 1990
47. Incarceration and sexually transmitted infections: a neighborhood perspective.
- Author
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Thomas JC, Levandowski BA, Isler MR, Torrone E, Wilson G, Thomas, James C, Levandowski, Brooke A, Isler, Malika Roman, Torrone, Elizabeth, and Wilson, George
- Abstract
The social dynamics of some communities are affected by the loss of significant numbers of people to prison and by the release of others who encounter the challenge of coping with the negative effects of the incarceration experience. The effects on communities are evident, in part, in the high rates of sexually transmitted infections (STIs) in North Carolina (NC) counties that have a high rate of incarceration. In the present study, we examined whether the same associations can be observed at the census tract level in one urban city of NC. To identify the mechanisms by which incarceration can affect the transmission of STIs, we conducted ethnographic interviews with ex-offenders and people who lost a sexual partner to prison. We found that census tract rates of incarceration were consistently associated with gonorrhea rates in the subsequent year. An increase of the percentage of census tract person-time spent in prison from 2.0% to 2.5% corresponded to a gonorrhea rate increase of 7.1 cases per 100,000 person-years. The people interviewed spoke of sexual partnership changes including those left behind finding new partners, in part for help in making financial ends meet; men having sex with men for the first time in prison; and having multiple new partners upon reentry to the community. The statistical associations and stories of the effects of incarceration on sexual relationships provide additional evidence of unintended community health consequences of high rates of incarceration. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
48. Evaluation of the National School Health Coordinator Leadership Institute.
- Author
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Ottoson JM, Streib G, Thomas JC, Rivera M, and Stevenson B
- Subjects
SCHOOL health services ,SCHOOL hygiene ,SOCIETIES ,TRAINING of school employees ,TRAINING ,LEADERSHIP - Abstract
In 1999 the American Cancer Society (ACS) launched the National School Health Coordinator Leadership Institute, a groundbreaking initiative designed to enhance and invigorate school health in the nation's schools by training individual school health coordinators to act as change agents. The Institute consisted of three, week-long summer training sessions, and three, shorter midyear 'booster' sessions, with the various sessions designed to assist one cohort of participants (n = 50) to build leadership capacities to coordinate school health. This evaluation examined the effects of the Institute as measured through a panel survey of participants - school health coordinators or their equivalents - over an 18-month period. Findings suggest that substantial progress was made in institutionalizing the school health coordination function in the target school districts. Specifically, in contrast to when the training began, clear, written position descriptions are common among program participants, most have functioning school health councils in their school districts, and program trainees appear to be moving aggressively to enhance the infrastructure for school health coordination through planning, setting priorities, and assessing needs. Program trainees report spending increased time on school health coordination, and they are active in spreading the word about coordinated school health programs. Trainees viewed the Institute as relevant to their needs, though not all aspects of the program are viewed as equally useful. As possible shortcomings, the training needed more emphasis on funding for school health coordination, and a low level of evaluation skills existed among coordinators. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
49. A study in contrasts: measures of racial disparity in rates of sexually transmitted disease.
- Author
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Dombrowski JC, Thomas JC, Kaufman JS, Dombrowski, Julia C, Thomas, James C, and Kaufman, Jay S
- Abstract
Background: Although relative measures are commonly used to express health disparities, absolute measures could have more value in public health decision-making.Goal: The goal of this study was to examine how associations between county-level variables and black-white racial disparity in gonorrhea rates varied by the measure of disparity used.Study Design: We studied correlations of 10 population-level variables with the incidence rate difference (RD) and incidence rate ratio (RR) of gonorrhea in North Carolina (NC) counties.Results: Nine of the 10 variables correlated more strongly with the RD than the RR. The RD was highly correlated with incidence rates of gonorrhea among blacks (r >0.99).Conclusion: Several county-level variables were correlated with absolute, but not with relative, racial disparity in gonorrhea in NC. Disease rates were so disparate that the RD essentially reflected rates in the black population. The RD should be preferentially used in planning and evaluating interventions aimed at eliminating racial disparities in gonorrhea in NC. [ABSTRACT FROM AUTHOR]- Published
- 2004
- Full Text
- View/download PDF
50. From the schools of public health. Teaching ethics in schools of public health.
- Author
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Thomas JC
- Published
- 2003
- Full Text
- View/download PDF
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