5,582 results on '"Rice, J."'
Search Results
2. The Collaborative Study on the Genetics of Alcoholism: Overview
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Agrawal, Arpana, Brislin, Sarah J, Bucholz, Kathleen K, Dick, Danielle, Hart, Ronald P, Johnson, Emma C, Meyers, Jacquelyn, Salvatore, Jessica, Slesinger, Paul, Liu, Y, Plawecki, MH, Kamarajan, C, Pandey, A, Bierut, L, Rice, J, Schuckit, M, Scott, D, Bauer, L, Wetherill, L, Xuei, X, Lai, D, O'Connor, S, Chan, G, Chorlian, DB, Zhang, J, Barr, P, Kinreich, S, Pandey, G, Mullins, N, Anokhin, A, Hartz, S, McCutcheon, V, Saccone, S, Moore, J, Aliev, F, Pang, Z, Kuo, S, Chin, H, Parsian, A, Almasy, Laura, Foroud, Tatiana, Goate, Alison, Hesselbrock, Victor, Kramer, John, Kuperman, Samuel, Merikangas, Alison K, Nurnberger, John I, Tischfield, Jay, Edenberg, Howard J, and Porjesz, Bernice
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Biological Sciences ,Genetics ,Neurosciences ,Clinical Research ,Alcoholism ,Alcohol Use and Health ,Substance Misuse ,Brain Disorders ,Human Genome ,Mental Health ,Behavioral and Social Science ,Mental health ,Good Health and Well Being ,COGA Collaborators ,AUD ,EEG ,ERP ,SSAGA ,alcohol dependence ,alcohol use disorder ,brain ,developmental ,family ,genomics ,lifespan ,longitudinal ,psychiatric ,Medical and Health Sciences ,Psychology and Cognitive Sciences ,Neurology & Neurosurgery - Abstract
Alcohol use disorders (AUD) are commonly occurring, heritable and polygenic disorders with etiological origins in the brain and the environment. To outline the causes and consequences of alcohol-related milestones, including AUD, and their related psychiatric comorbidities, the Collaborative Study on the Genetics of Alcoholism (COGA) was launched in 1989 with a gene-brain-behavior framework. COGA is a family based, diverse (~25% self-identified African American, ~52% female) sample, including data on 17,878 individuals, ages 7-97 years, in 2246 families of which a proportion are densely affected for AUD. All participants responded to questionnaires (e.g., personality) and the Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA) which gathers information on psychiatric diagnoses, conditions and related behaviors (e.g., parental monitoring). In addition, 9871 individuals have brain function data from electroencephalogram (EEG) recordings while 12,009 individuals have been genotyped on genome-wide association study (GWAS) arrays. A series of functional genomics studies examine the specific cellular and molecular mechanisms underlying AUD. This overview provides the framework for the development of COGA as a scientific resource in the past three decades, with individual reviews providing in-depth descriptions of data on and discoveries from behavioral and clinical, brain function, genetic and functional genomics data. The value of COGA also resides in its data sharing policies, its efforts to communicate scientific findings to the broader community via a project website and its potential to nurture early career investigators and to generate independent research that has broadened the impact of gene-brain-behavior research into AUD.
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- 2023
3. Effective circuit modelling and experimental realization of an ultra-compact self-rectifier flux pump
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Mallett, B. P. P., Venuturumilli, S., Clarke, J., Leuw, B., Rice, J. H. P., Moseley, D. A., Bumby, C. W., Geng, J., and Badcock, R. A.
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Condensed Matter - Superconductivity ,Physics - Applied Physics - Abstract
This paper presents experimental and modelling results of an ultra-compact self-rectifier flux pump energizing a superconducting coil. The device fits inside a volume of 65x65x50~mm and generates up to 320~A dc through the coil and a peak output voltage up to 60~mV. We also develop and present a full electromagnetic effective circuit model of the flux pump and compare its predictions to the experimental results. We show that our model can reproduce accurately the charging of the load coil and that it reproduces the systematic dependence of the maximum load coil current on the input current waveform. The experiments and modelling together show also the importance of dc-flux offsets in the transformer core on the final achievable current through the coil. The miniaturization possible for this class of flux pump and their minimal heat-leak into the cryogenic environment from thermal conduction make them attractive for applications with demanding size, weight and power limitations. Our effective circuit model is a useful tool in the understanding, design and optimization of such flux pumps which will accelerate their progression from research devices to their application., Comment: 9 pages, 8 figures
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- 2022
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4. Sexuality and the Politics of Ethos in the Writing Classroom (review)
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Rice, J. A.
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- 2008
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5. Corticosteroid Use and Adherence in Patients Treated with Acthar Gel for Advanced Sarcoidosis
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Hayes, Kyle, Niewoehner, John, Rice, J. Bradford, Downes, Nathaniel, Hagopian, Ella, Ma, Izzy, and Wan, George J.
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- 2023
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6. First Identification of New X-Ray Spectra of Mo39+, Mo40+, W43+, W44+ and W45+ on EAST
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Wang, Fudi, Lu, Dian, Gu, Mingfeng, Jin, Yifei, Fu, Jia, Shi, Yuejiang, Yang, Yang, Rice, J. E., Bitter, Manfred, Zang, Qing, Zhao, Hailin, He, Liang, Li, Miaohui, Xu, Handong, Liu, Haijing, Lin, Zichao, Chen, Yifei, Shen, Yongcai, Hill, Kenneth, Bae, Cheonho, Fu, Shengyu, Zhang, Hongming, Lee, Sanggon, Yang, Xiaoqing, Jia, Guozhang, Li, Yingying, Lyu, Bo, Huang, Juan, Gong, Xianzu, and Wan, Baonian
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Physics - Plasma Physics - Abstract
New high-resolution x-ray spectra of Mo39+, Mo40+, W43+, W44+ and W45+ have been carefully confirmed for the first time by use of the x-ray imaging crystal spectrometer (XCS) in Experimental Advanced Superconducting Tokamak (EAST) under various combined auxiliary heating plasmas conditions. Wavelength of these new x-ray spectra is ranged from 3.895 {\AA} to 3.986 {\AA}. When core electron temperature (Te0) reaches 6.0 keV, Mo39+ and Mo40+ lines of 3.9727, 3.9294 and 3.9480 {\AA} can be effectively detected on XCS for EAST; meanwhile, line-integrated brightness of these spectral lines of Mo39+ and Mo40+ is very considerable when electron temperature reaches 12.9 keV. Multi-components spectral lines for W43+, W44+ and W45+ have also been identified when Te0 reaches 6 keV. Parts of spectral lines, such as Zn-1, Cu-2, Cu-4a, Cu-4d and Cu-5 lines of tungsten, are first observed experimentally. When electron temperature reaches 12.9 keV, line-integrated intensity for part of these spectral lines of W43+, W44+ and W45+ are considerable. These experimental results and theoretical predictions from FAC and FLYCHK codes are in good general agreement. These new spectral lines, obtained on XCS for EAST, are vital for deeply uncovering the mechanisms of ion and electron thermal, high-Z impurity and momentum (anomalous) transport to achieve the advanced steady-state operation scenarios for ITER and CFETR.
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- 2022
7. High Polygenic Risk Scores Are Associated With Early Age of Onset of Alcohol Use Disorder in Adolescents and Young Adults at Risk
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Nurnberger, John I, Wang, Yumin, Zang, Yong, Lai, Dongbing, Wetherill, Leah, Edenberg, Howard J, Aliev, Fazil, Plawecki, Martin H, Chorlian, David, Chan, Grace, Bucholz, Kathleen, Bauer, Lance, Kamarajan, Chella, Salvatore, Jessica E, Kapoor, Manav, Hesselbrock, Victor, Dick, Danielle, Bierut, Laura, McCutcheon, Vivia, Meyers, Jacquelyn L, Porjesz, Bernice, Kramer, John, Kuperman, Samuel, Kinreich, Sivan, Anokhin, Andrey P, Porjesz, B, Hesselbrock, V, Foroud, T, Agrawal, A, Dick, D, Edenberg, HJ, Nurnberger, J, Liu, Y, Kuperman, S, Kramer, J, Meyers, J, Kamarajan, C, Pandey, A, Bierut, L, Rice, J, Bucholz, K, Schuckit, M, Tischfield, J, Brooks, A, Hart, R, Almasy, L, Salvatore, J, Goate, A, Kapoor, M, Slesinger, P, Scott, D, Bauer, L, Wetherill, L, Xuei, X, Lai, D, O’Connor, S, Plawecki, M, Zang, Y, Acion, L, Chan, G, Chorlian, DB, Zhang, J, Kinreich, S, Pandey, G, Chao, M, Anokhin, A, McCutcheon, V, Saccone, S, Aliev, F, Barr, P, Chin, H, and Parsian, A
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Biological Sciences ,Biomedical and Clinical Sciences ,Genetics ,Epidemiology ,Health Sciences ,Prevention ,Substance Misuse ,Underage Drinking ,Alcoholism ,Alcohol Use and Health ,Pediatric ,Clinical Research ,Mental health ,Good Health and Well Being ,Collaborative Study on the Genetics of Alcoholism ,Alcohol use disorder ,Clinical variables ,Polygenic risk scores ,Prediction of illness ,Receiver operating characteristics curves ,Survival analysis - Abstract
BackgroundGenome-wide association studies have been conducted in alcohol use disorder (AUD), and they permit the use of polygenic risk scores (PRSs), in combination with clinical variables, to predict the onset of AUD in vulnerable populations.MethodsA total of 2794 adolescent/young adult subjects from the Collaborative Study on the Genetics of Alcoholism were followed, with clinical assessments every 2 years. Subjects were genotyped using a genome-wide chip. Separate PRS analyses were performed for subjects of European ancestry and African ancestry. Age of onset of DSM-5 AUD was evaluated using the Cox proportional hazard model. Predictive power was assessed using receiver operating characteristic curves and by analysis of the distribution of PRS.ResultsEuropean ancestry subjects with higher than median PRSs were at greater risk for onset of AUD than subjects with lower than median PRSs (p = 3 × 10-7). Area under the curve for the receiver operating characteristic analysis peaked at 0.88 to 0.95 using PRS plus sex, family history, comorbid disorders, age at first drink, and peer drinking; predictive power was primarily driven by clinical variables. In this high-risk sample, European ancestry subjects with a PRS score in the highest quartile showed a 72% risk for developing AUD and a 35% risk of developing severe AUD (compared with risks of 54% and 16%, respectively, in the lowest quartile).ConclusionsPredictive power for PRSs in the extremes of the distribution suggests that these may have future clinical utility. Uncertainties in interpretation at the individual level still preclude current application.
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- 2022
8. Experimental Inference of Neutral and Impurity Transport in Alcator C-Mod Using High-Resolution X-Ray and Ultra-Violet Spectra
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Sciortino, F., Howard, N. T., Reksoatmodjo, R., Foster, A. R., Hughes, J. W., Marmar, E. S., Miller, M. A., Mordijck, S., Odstrcčil, T., Pütterich, T., Reinke, M. L., Rice, J. E., and Rodriguez-Fernandez, P.
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Physics - Plasma Physics ,Physics - Atomic Physics - Abstract
We present experimental inferences of cross-field impurity transport coefficients for Alcator C-Mod plasmas using a novel forward model for the entire Ca K-alpha spectrum, including satellite lines within the spectral range, to compare to high-resolution X-ray Imaging Crystal Spectroscopy (XICS). These measurements are complemented by Extreme Ultra-Violet (EUV) spectroscopy that constrains transport closer to the edge. Using new atomic data sets for both XICS and EUV analysis has enabled consideration of line ratios across both spectral ranges and has increased the accuracy of inferred transport coefficients. Inclusion of charge exchange between edge thermal neutrals and impurities is shown to be extremely important in C-Mod pedestals. We obtain D atomic neutral densities from experimental D Ly-alpha measurements at the midplane and compare these to SOLPS-ITER simulations, finding good agreement. Bayesian inferences of impurity transport coefficients are presented for L-, EDA H-, and I-mode discharges, making use of the Aurora package for forward modeling and combining our spectroscopic constraints. Experimentally inferred diffusion profiles are found to match turbulent transport models at midradius within uncertainties, using both quasilinear gyro-fluid TGLF SAT-1 and nonlinear ion-scale gyrokinetic CGYRO simulations. Significant discrepancies in convection are observed in some cases, suggesting difficulties in predictions of flat or hollow impurity profiles., Comment: 23 pages of main body; 38 pages including appendices. 17 figures. Submitted to Nuclear Fusion
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- 2021
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9. Till geochemical data for the Brazil Lake pegmatite area, southwest Nova Scotia, Canada (NTS 21-A/04, 20-O/16 and 20-P/13): samples collected in 2020, 2021, and 2022
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Brushett, D M, primary, Beckett-Brown, C E, additional, McClenaghan, M B, additional, Paulen, R C, additional, Rice, J M, additional, Haji Egeh, A, additional, and Pelchat, P, additional
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- 2024
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10. Surficial Data Model: the science language of the integrated Geological Survey of Canada data model for surficial geology maps
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Deblonde, C, primary, Campbell, J E, additional, Chow, W, additional, Cocking, R B, additional, Huntley, D H, additional, Parent, M, additional, Rice, J M, additional, Robertson, L, additional, Smith, I R, additional, Weatherston, A, additional, and Zawadzka, K, additional
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- 2024
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11. Who needs critical agency? : educational research and the rhetorical economy of globalization
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Rice, J. A. and Vastola, Michael
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- 2011
12. Inference of Experimental Radial Impurity Transport on Alcator C-Mod: Bayesian Parameter Estimation and Model Selection
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Sciortino, F., Howard, N. T., Marmar, E. S., Odstrcil, T., Cao, N. M., Dux, R., Hubbard, A. E., Hughes, J. W., Irby, J. H., Marzouk, Y., Milanese, L. M., Reinke, M. L., Rice, J. E., and Rodriguez-Fernandez, P.
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Physics - Plasma Physics ,Physics - Applied Physics ,Physics - Computational Physics ,Physics - Data Analysis, Statistics and Probability - Abstract
We present a fully Bayesian approach for the inference of radial profiles of impurity transport coefficients and compare its results to neoclassical, gyrofluid and gyrokinetic modeling. Using nested sampling, the Bayesian Impurity Transport InferencE (BITE) framework can handle complex parameter spaces with multiple possible solutions, offering great advantages in interpretative power and reliability with respect to previously demonstrated methods. BITE employs a forward model based on the pySTRAHL package, built on the success of the well-known STRAHL code [Dux, IPP Report, 2004], to simulate impurity transport in magnetically-confined plasmas. In this paper, we focus on calcium (Ca, Z=20) Laser Blow-Off injections into Alcator C-Mod plasmas. Multiple Ca atomic lines are diagnosed via high-resolution X-ray Imaging Crystal Spectroscopy and Vacuum Ultra-Violet measurements. We analyze a sawtoothing I-mode discharge for which neoclassical and turbulent (quasilinear and nonlinear) predictions are also obtained. We find good agreement in diffusion across the entire radial extent, while turbulent convection and density profile peaking are estimated to be larger in experiment than suggested by theory. Efforts and challenges associated with the inference of experimental pedestal impurity transport are discussed., Comment: 38 pages, 19 figures, submitted for publication in Nuclear Fusion
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- 2020
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13. Depositional Facies and Sequence Stratigraphy of Kodiak Butte, Western Delta of Jezero Crater, Mars
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Caravaca, G., primary, Dromart, G., additional, Mangold, N., additional, Gupta, S., additional, Kah, L. C., additional, Tate, C., additional, Williams, R. M. E., additional, Le Mouélic, S., additional, Gasnault, O., additional, Bell, J., additional, Beyssac, O., additional, Nuñez, J. I., additional, Randazzo, N., additional, Rice, J., additional, Crumpler, L. S., additional, Williams, A., additional, Russel, P., additional, Stack, K. M., additional, Farley, K. A., additional, Maurice, S., additional, and Wiens, R. C., additional
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- 2024
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14. High Polygenic Risk Scores Are Associated With Early Age of Onset of Alcohol Use Disorder in Adolescents and Young Adults at Risk
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Porjesz, B., Hesselbrock, V., Foroud, T., Agrawal, A., Dick, D., Edenberg, H.J., Nurnberger, J., Jr., Liu, Y., Kuperman, S., Kramer, J., Meyers, J., Kamarajan, C., Pandey, A., Bierut, L., Rice, J., Bucholz, K., Schuckit, M., Tischfield, J., Brooks, A., Hart, R., Almasy, L., Salvatore, J., Goate, A., Kapoor, M., Slesinger, P., Scott, D., Bauer, L., Wetherill, L., Xuei, X., Lai, D., O’Connor, S., Plawecki, M., Zang, Y., Acion, L., Chan, G., Chorlian, D.B., Zhang, J., Kinreich, S., Pandey, G., Chao, M., Anokhin, A., McCutcheon, V., Saccone, S., Aliev, F., Barr, P., Chin, H., Parsian, A., Nurnberger, John I., Jr., Wang, Yumin, Zang, Yong, Lai, Dongbing, Wetherill, Leah, Edenberg, Howard J., Aliev, Fazil, Plawecki, Martin H., Chorlian, David, Chan, Grace, Bucholz, Kathleen, Bauer, Lance, Kamarajan, Chella, Salvatore, Jessica E., Kapoor, Manav, Hesselbrock, Victor, Dick, Danielle, Bierut, Laura, McCutcheon, Vivia, Meyers, Jacquelyn L., Porjesz, Bernice, Kramer, John, Kuperman, Samuel, Kinreich, Sivan, and Anokhin, Andrey P.
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- 2022
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15. Deliberating performance targets workshop: Potential paths for emerging PM2.5 and O3 air sensor progress.
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Williams, R, Duvall, R, Kilaru, V, Hagler, G, Hassinger, L, Benedict, K, Rice, J, Kaufman, A, Judge, R, Pierce, G, Allen, G, Bergin, M, Cohen, RC, Fransioli, P, Gerboles, M, Habre, R, Hannigan, M, Jack, D, Louie, P, Martin, NA, Penza, M, Polidori, A, Subramanian, R, Ray, K, Schauer, J, Seto, E, Thurston, G, Turner, J, Wexler, AS, and Ning, Z
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Low-cost air quality sensors ,PM2.5 ,Performance targets - Abstract
The United States Environmental Protection Agency held an international two-day workshop in June 2018 to deliberate possible performance targets for non-regulatory fine particulate matter (PM2.5) and ozone (O3) air sensors. The need for a workshop arose from the lack of any market-wide manufacturer requirement for Ozone documented sensor performance evaluations, the lack of any independent third party or government-based sensor performance certification program, and uncertainty among all users as to the general usability of air sensor data. A multi-sector subject matter expert panel was assembled to facilitate an open discussion on these issues with multiple stakeholders. This summary provides an overview of the workshop purpose, key findings from the deliberations, and considerations for future actions specific to sensors. Important findings concerning PM2.5 and O3 sensors included the lack of consistent performance indicators and statistical metrics as well as highly variable data quality requirements depending on the intended use. While the workshop did not attempt to yield consensus on any topic, a key message was that a number of possible future actions would be beneficial to all stakeholders regarding sensor technologies. These included documentation of best practices, sharing quality assurance results along with sensor data, and the development of a common performance target lexicon, performance targets, and test protocols.
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- 2019
16. Managing nicotine dependence in clinical settings
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Guillaumier, A, primary, McCarter, K, additional, Trigg, J, additional, Hines, S, additional, Jackson, M, additional, Harrison, N, additional, Ishaque, S, additional, Rice, J, additional, Dowling, A, additional, Ela, O, additional, Bowden, J, additional, Dunlop, A, additional, Passey, M, additional, Baker, A, additional, and Bonevski, B, additional
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- 2023
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17. The effects of mixing multi-component HLW glasses on spinel crystal size
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Lonergan, C.E., Rice, J., Skidmore, C., Schweiger, M.J., and Hrma, P.
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- 2022
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18. Experimental observations and modelling of intrinsic rotation reversals in tokamaks
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Camenen, Y., Angioni, C., Bortolon, A., Duval, B. P., Fable, E., Hornsby, W. A., Mcdermott, R. M., Na, D. H., Na, Y-S., Peeters, A. G., and Rice, J. E.
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Physics - Plasma Physics - Abstract
The progress made in understanding spontaneous toroidal rotation reversals in tokamaks is reviewed and current ideas to solve this ten-year-old puzzle are explored. The paper includes a summarial synthesis of the experimental observations in AUG, C-Mod, KSTAR, MAST and TCV tokamaks, reasons why turbulent momentum transport is thought to be responsible for the reversals, a review of the theory of turbulent momentum transport and suggestions for future investigations.
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- 2017
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19. Performance predictions of the SPARC x-ray crystal spectrometers for ion temperature and toroidal rotation measurements.
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Perks, C., Vezinet, D., Rice, J. E., and Reinke, M. L.
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ION temperature ,X-ray spectrometers ,ELECTROMAGNETIC spectrum ,IMAGE converters ,COPPER - Abstract
SPARC will be outfitted with three systems of x-ray crystal spectrometer arrays. Two of these are designed using cylindrically bent crystals to achieve high spectral-resolution for ion temperature and toroidal velocity measurements via imaging He-like Kr and Ne-like Xe. The last acts as a spectral survey system to monitor Ne-like W and nearby H- and He-like emission from Cr, Fe, Co, Ni, and Cu. Line radiation intensities are calculated using the Flexible Atomic Code for atomic data and ColRadPy for collisional-radiative modeling, then convoluted with a Voigt line shape. Free–free, free-bound, and two-photon continuum radiation is also included. The ToFu code is used to perform volume-of-sight integration to produce synthetic detector images. In addition, presented is cross-validation performed using the XICSRT Monte Carlo ray-tracing code. Ion temperature and toroidal velocity profiles are reconstructed using ToFu via tomographic inversion. [ABSTRACT FROM AUTHOR]
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- 2024
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20. Development of the prototype for the SPARC hard X-ray monitor.
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Panontin, E., Tinguely, R. A., Hartwig, Z. S., Saltos, A. A., Vezinet, D., and Rice, J.
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HARD X-rays ,PHOTOMULTIPLIERS ,PLASMA confinement ,NEW business enterprises ,TOKAMAKS ,BREMSSTRAHLUNG - Abstract
The SPARC tokamak will be equipped with a hard X-ray (HXR) monitor system capable of measuring the bremsstrahlung emission from runaway electrons with photon energies in excess of about 100 keV. This diagnostic will detect the formation of runaway electron beams during plasma start-up and inform the plasma control system to terminate the discharge early to protect the machine. In this work, we present a 0D estimate of the HXR emission in SPARC during plasma start-up. Then we discuss the characterization of a prototype of the HXR monitor. The detector mounts a 1 × 1-in.
2 LaBr3 inorganic scintillator coupled with a photomultiplier tube and has been tested with γ-ray sources to find its dynamic range. Finally, two possible modes of operation for spectroscopic and current mode measurements on SPARC are proposed. [ABSTRACT FROM AUTHOR]- Published
- 2024
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21. Probable Concretions Observed in the Shenandoah Formation of Jezero Crater, Mars and Comparison With Terrestrial Analogs.
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Kalucha, H., Broz, A., Randazzo, N., Aramendia, J., Madariaga, J. M., Garczynski, B., Lanza, N., Mandon, L., Fouchet, T., Catling, D. C., Fairén, A. G., Kivrak, L., Gasda, P. J., Núñez, J. I., Cloutis, E., Hand, K. P., Rice, J. W., Fischer, W. W., Maurice, S., and Wiens, R. C.
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MARTIAN craters ,BEDROCK ,MICROBIAL metabolism ,CLAY minerals ,CALCIUM salts - Abstract
The Mars 2020 Perseverance Rover imaged diagenetic textural features in four separate sedimentary units in its exploration of the 25‐m‐thick Shenandoah formation at Jezero Crater, Mars, that we interpreted as probable concretions. These concretions were most abundant in the Hogwallow Flats member of the Shenandoah formation and were restricted to the light‐toned, platy, sulfur‐cemented bedrock at outcrop surfaces, whereas the finely laminated, darker toned, mottled and deformed strata lack concretions. The concretions also had a wide range of morphologies including concentric, oblate, urn, and spheroidal shaped forms that were not clustered, and ranged in size from ∼1 to 16 mm with a median of 2.65 mm. The elemental composition of the concretions compared to the bedrock had greater abundance of magnesium and calcium salts, silicates, and possibly hematite. We compared these Jezero Crater concretions to the geochemistry of concretions from previously published studies and from two new terrestrial analog sites (Gallup Formation, New Mexico and Torrey Pines, California). In addition, we measured organic carbon content of three terrestrial sedimentary analogs of increasing age that contain concretions (Torrey Pines (Pleistocene), Gallup Formation (∼89 Ma), and Moodies Group (∼3.2 Ga)). All measured concretions contained significant concentrations of organic carbon with the maximum organic carbon content (∼2 wt. % Total organic carbon) found in the Moodies Group concretions. Organic carbon abundances in terrestrial concretions was controlled more by the formation mechanism and relative timing of concretion development rather than deposit age. These findings suggested that concretions at Jezero Crater reflect local sites of enhanced biosignature preservation potential. Plain Language Summary: The Perseverance Rover discovered concretions in its exploration of the rock packages at Jezero Crater, Mars and one of the sample return cores was collected from concretion‐rich bedrock. Concretions are resistant cement in the rock that are found in many shapes (usually spherical or oblate) and range from millimeter to meter size scales on Earth; they can be formed through inorganic water‐rock reactions or facilitated by microbial metabolisms. We documented the abundance, size, composition, and shape of the concretions to understand how these features were formed. We found that the concretions are mixtures of salts, clay minerals, and iron oxides. We compared these results to terrestrial concretions with similar mineral compositions and measured the organic carbon in four terrestrial analogs. Comparisons with terrestrial concretions in this study and the literature suggested that the concretion composition in Jezero Crater could have high organic preservation potential. Thus, the concretions in Jezero Crater may retain organic carbon and other biosignatures and might therefore be considered as high priority samples of astrobiological interest out of the current sample suite for return to Earth. Key Points: Jezero Crater concretions are variably enriched in Si, Ca, and Mg salts, and Fe oxidesTerrestrial concretions of similar mineralogy analyzed in this study contain significant organic carbon phasesBased on terrestrial analogs, Jezero Crater concretions may represent sites of enhanced biosignature preservation potential [ABSTRACT FROM AUTHOR]
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- 2024
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22. Regional lake sediment geochemical data from east-central Labrador (NTS 013-I, 013-J, 013-K 013-N, and 013-O): reanalysis data and QA/QC evaluation
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McCurdy, M W, primary, Rice, J M, additional, Campbell, HE, additional, and Paulen, R C, additional
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- 2023
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23. Indicator mineral studies at the Brazil Lake LCT Pegmatites, southwest Nova Scotia
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McClenaghan, M B, primary, Brushett, D M, additional, Beckett-Brown, C E, additional, Paulen, R C, additional, Rice, J M, additional, Haji Egeh, A, additional, and Nissen, A, additional
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- 2023
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24. Quaternary geology of the southern Core Zone area, Quebec and Newfoundland and Labrador
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Rice, J, primary, Paulen, R C, additional, Ross, M, additional, McClenaghan, M B, additional, and Campbell, H E, additional
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- 2023
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25. Introduction and Summary
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McMartin, I, primary, Kerr, D E, additional, McClenaghan, M B, additional, Duk-Rodkin, A, additional, Tremblay, T, additional, Parent, M, additional, and Rice, J M, additional
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- 2023
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26. Introduction et Sommaire
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McMartin, I, primary, Kerr, D E, additional, McClenaghan, M B, additional, Duk-Rodkin, A, additional, Tremblay, T, additional, Parent, M, additional, and Rice, J M, additional
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- 2023
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27. P821 Multi-site analysis of upadacitinib effectiveness in Crohn's Disease patients: A UK perspective
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Radia, C, primary, Danso, Y, additional, Kok, K, additional, Samaan, M, additional, Kent, A J, additional, Pavlidis, P, additional, Patel, K, additional, Harrow, P, additional, Yeung, K, additional, Hussain, M A, additional, Dong, C, additional, Morris, T, additional, Patel, C, additional, Cummings, J F, additional, Hale, M, additional, Pillay, L, additional, Walsh, A, additional, Sebastian, S, additional, Trodden-Mittnacht, H, additional, Davis, E, additional, Yeo, J H, additional, Campbell, R, additional, Mehta, S, additional, Sethi-Arora, K, additional, Fraser, A, additional, George, B, additional, Harvey, P, additional, Sawan, N J, additional, Hicks, L, additional, Allah-Ditta, M, additional, Johnston, E, additional, Dhar, A, additional, Al-zarrad, D, additional, Kumar, R, additional, Young, D, additional, Butler, K, additional, Raine, T, additional, Rice, J, additional, Hewitt, A, additional, and Selinger, C, additional
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- 2024
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28. P309 Impact of EBV Status on decision making for advanced therapies in IBD Patients
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Robertson, H, primary, Thut, J, additional, Turnbull, J, additional, Whitehead, E, additional, Fitzgerald, A L, additional, McBride, J, additional, Savage, R, additional, Wilkinson, J, additional, Harper, P, additional, Rice, J, additional, Pattinson, A, additional, Bautista, N, additional, and Sebastian, S, additional
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- 2024
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29. Identification of introduced and stably inherited DNA methylation variants in soybean associated with soybean cyst nematode parasitism
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Rambani, Aditi, Pantalone, Vince, Yang, Songnan, Rice, J. Hollis, Song, Qijian, Mazarei, Mitra, Arelli, Prakash R., Meksem, Khalid, Stewart, C. Neal, and Hewezi, Tarek
- Published
- 2020
30. How structural differences influence cross-model consistency: An electric sector case study
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Cohen, S.M., Iyer, G.C., Brown, M., Macknick, J., Wise, M., Binsted, M., Voisin, N., Rice, J., and Hejazi, M.
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- 2021
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31. Consequences of Insurance Denials Among U.S. Patients Prescribed Repository Corticotropin Injection for Acute Exacerbations of Multiple Sclerosis
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Rice, J. Bradford, Panaccio, Mary P., White, Alan, Simes, Mark, Billmyer, Emma, Downes, Nathaniel, Niewoehner, John, and Wan, George J.
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- 2021
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32. Radio Afterglow Rebrightening: Evidence for Multiple Active Phases in Gamma-Ray Burst Central Engines
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Li, L. B., Zhang, Z. B., and Rice, J.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
The rebrightening phenomenon is an interesting feature in some X-ray, optical, and radio afterglows of gamma-ray bursts (GRBs). Here, we propose a possible energy-supply assumption to explain the rebrightenings of radio afterglows, in which the central engine with multiple active phases can supply at least two GRB pulses in a typical GRB duration time. Considering the case of double pulses supplied by the central engine, the double pulses have separate physical parameters, except for the number density of the surrounding interstellar medium (ISM). Their independent radio afterglows are integrated by the ground detectors to form the rebrightening phenomenon. In this work, we firstly simulate diverse rebrightening light curves under consideration of different and independent physical parameters. Using this assumption, we also give our best fit to the radio afterglow of GRB 970508 at three frequencies of 1.43, 4.86, and 8.46 GHz. We suggest that the central engine may be active continuously at a timescale longer than that of a typical GRB duration time as many authors have suggested, and that it may supply enough energy to cause the long-lasting rebrightenings observed in some GRB afterglows., Comment: 6 pages, 2 figures and 1 table; Comments are welcome
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- 2015
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33. Opioid-Sparing Anesthetic Technique for Pediatric Patients Undergoing Adenoidectomy: A Pilot Study
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Alghamdi F, Roth C, Jatana KR, Elmaraghy CA, Rice J, Tobias JD, and Thung AK
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opioid ,sparing ,analgesia ,pediatric ,adenoidectomy ,Medicine (General) ,R5-920 - Abstract
Faris Alghamdi,1 Catherine Roth,1 Kris R Jatana,2 Charles A Elmaraghy,2 Julie Rice,1 Joseph D Tobias,1 Arlyne K Thung1 1Department of Anesthesiology & Pain Medicine, Nationwide Children’s Hospital and the Ohio State University College of Medicine, Columbus, OH, USA; 2Department of Otolaryngology and Head & Neck Surgery, Nationwide Children’s Hospital and the Ohio State University, Columbus, OH, USACorrespondence: Arlyne K ThungDepartment of Anesthesiology & Pain Medicine, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH 43205, USATel +1 614 722-4200Fax +1 614 722-4203Email Arlyne.Thung@Nationwidechildrens.orgIntroduction: An opioid-sparing anesthetic involves a multi-modal technique with non-opioid medications targeting different analgesic pathways. Such techniques may decrease adverse effects related to opioids. These techniques may be considered in patients at higher risk for opioid-related adverse effects including obstructive sleep apnea or sleep disordered breathing.Methods: A prospective, pilot study was performed in 10 patients (3– 8 years of age), presenting for adenoidectomy. The perioperative regimen included oral dextromethorphan (1 mg/kg) and acetaminophen (15 mg/kg) plus single boluses of intraoperative dexmedetomidine (0.5 μg/kg) and ketamine (0.5 mg/kg). Pain scores were assessed in the post anesthesia care unit (PACU) using the FLACC (Face, Legs, Activity, Cry, Consolability) scale. Patients with a pain score > 4 received fentanyl as needed. PACU time, pain scores, and parent satisfaction were recorded. Postoperatively, patients were instructed to use oral acetaminophen or ibuprofen every 6 hours as needed for pain.Results: The study cohort included 10 patients, 3– 8 years of age. All patients had opioid-free anesthetic care. PACU time ranged from 24 to 102 minutes (median: 56 minutes). FLACC pain scores were 0 for all PACU assessments. Nine patients were discharged home and 1 patient had a planned overnight admission. Following hospital discharge, the pain scores were satisfactory during the 72-hour study period and 90% of the patients’ guardians were satisfied or highly satisfied with their child’s pain control.Conclusion: This opioid-sparing approach provided safe and effective pain control as well as parental satisfaction following adenoidectomy in children. Additional prospective studies are needed to determine whether this regimen is effective in a larger cohort of patients with and for other otolaryngology procedures.Keywords: opioid, sparing, analgesia, pediatric, adenoidectomy
- Published
- 2020
34. P2.06-08 Phase I/II Study of Rucaparib and Pembrolizumab Maintenance in Stage IV NSCLC after Carboplatin, Pemetrexed, Pembrolizumab
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Qin, A., primary, Morgensztern, D., additional, Waqar, S., additional, Owen, D., additional, Gadgeel, S., additional, Schneider, B., additional, Kalemkerian, G., additional, Rice, J., additional, and Ramnath, N., additional
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- 2023
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35. A Survey to Define and Predict Difficult Vascular Access in the Pediatric Perioperative Population
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Hakim M, Shafy SZ, Uffman JC, Rice J, Raman VT, Tobias JD, and Beltran RJ
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peripheral intravenous cannulation ,pediatric anesthesiology ,difficult peripheral intravenous cannulation ,Pediatrics ,RJ1-570 - Abstract
Mohammed Hakim,1 Shabana Zainab Shafy,1 Joshua C Uffman,1,2 Julie Rice,1 Vidya T Raman,1,2 Joseph D Tobias,1,2 Ralph J Beltran1,2 1Department of Anesthesiology and Pain Medicine, Nationwide Children’s Hospital, Columbus, OH, USA; 2Department of Anesthesiology and Pain Medicine, The Ohio State University College of Medicine, Columbus, OH, USACorrespondence: Mohammed HakimDepartment of Anesthesiology and Pain Medicine, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH 43205, USATel +1 614 680-2552Fax +1 614 722-4203Email mushtaqahmedhakim.2@osu.eduBackground: Various criteria exist for defining difficult peripheral intravenous (DPIV) cannulation in infants and children. With the help of a survey tool, the characteristics perceived to increase the likelihood of DPIV cannulation amongst anesthesia providers were assessed.Methods: An individualized survey regarding DPIV which included pediatric anesthesiology faculty and certified registered nurse anesthetists at Nationwide Children’s Hospital and anesthesiology faculty members of Wake-up Safe was conducted. Anesthesia provider, patient, and procedural characteristics were expressed as a count and percentage, and compared according to group (faculty, certified registered nurse anesthetists, Wake-up Safe faculty) using analysis of variance.Results: Of the 48 local respondents, 33 (69%) reported age as a contributing factor to DPIV, and 32 (67%) reported weight as a factor. Of the 22 Wake-up Safe respondents, 14 (63%) reported age, and 16 (73%) reported weight as a factor. Patient and procedural characteristics perceived to increased likelihood of DPIV cannulation did not differ by respondent role. The factors most commonly mentioned by local respondents as contributing to DPIV included trisomy 21, neuromuscular disorders, and history of many prior IV cannulations. Among the Wake-up Safe faculty respondents, the most commonly mentioned factors were neuromuscular disorders, trisomy 21, and skin injuries or conditions.Conclusion: Age and weight were the two most commonly reported factors from both groups of respondents. Other factors contributing to DPIV included prior history of DPIV, neuromuscular disorders, trisomy 21 and American Society of Anesthesiology status ≥ 4. Patient and procedural characteristics were perceived to increase the likelihood of DPIV cannulation with no difference among respondents.Keywords: peripheral intravenous cannulation, pediatric anesthesiology, difficult peripheral intravenous cannulation
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- 2020
36. Perioperative Provider and Staff Competency in Providing Culturally Competent LGBTQ Healthcare in Pediatric Setting
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Walia H, Banoub R, Cambier GS, Rice J, Tumin D, Tobias JD, and Raman VT
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lgbtq ,health ,concerns ,competency ,training ,attitude ,Special aspects of education ,LC8-6691 ,Medicine (General) ,R5-920 - Abstract
Hina Walia,1 Rita Banoub,1,2 Gregory S Cambier,1,2 Julie Rice,1 Dmitry Tumin,1 Joseph D Tobias,1,2 Vidya T Raman1,2 1Department of Anesthesiology & Pain Medicine, Nationwide Children’s Hospital, Columbus, OH, USA; 2Department of Anesthesiology & Pain Medicine, The Ohio State University College of Medicine, Columbus, OH, USACorrespondence: Hina WaliaDepartment of Anesthesiology & Pain Medicine, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH 43205, USATel +1614 722-3846Fax +1614 722-4203Email hina.walia9@gmail.comIntroduction: Children and adolescents identifying as lesbian, gay, bisexual, transgender, or queer/questioning (LGBTQ) may feel reluctant to seek medical care due to stigma and the possibility of negative interactions with health care providers. Due to the short duration of the perioperative period, the interaction in this setting is limited and providers may not have the time to develop a rapport with the patient. It is imperative that staff are trained to address the patient and family in a culturally competent manner.Methods: We undertook surveys before and after a 2 part educational series among the pediatric perioperative staff to understand the impact of providing education and cultural competency training regarding caring for patients who identify as LGBTQ. Providers self-reported their knowledge and comfort on a 1–5 point scale (5 being most knowledgeable or comfortable) in 6 domains of caring for LGBTQ patients. Objective knowledge of LGBTQ issues was assessed using 7 questions based on lecture material. On objective assessment, knowledge of LGBTQ issues improved after cultural competency training.Results: The analysis included 90 responses. Before training, median ratings of knowledge and comfort were 3 or 4 out of a maximum of 5 for each domain. The pre-training median score on the 7-item test of LGBTQ cultural competency was 5 (IQR: 4, 6). After training, knowledge and comfort self-ratings did not improve, but the score on the objective knowledge test increased to a median of 6 (IQR: 4, 7; p=0.011) of 7 possible points.Discussion: Anesthesia providers participating in LGBTQ cultural competency training self-reported high levels of knowledge and comfort with providing care to LGBTQ patients even before formal training was provided. On objective assessment, knowledge of LGBTQ issues improved after cultural competency training.Keywords: LGBTQ, health, concerns, competency, training, attitude
- Published
- 2019
37. Predictors of High-cost Patients With Noninfectious Inflammatory Eye Diseases
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Nelson, Winnie W., Rice, J. Bradford, White, Alan G., Johnson, Michaela, Reiff, Julie, Lima, Antonio Flavio, Bartels-Peculis, Laura, Ciepielewska, Gosia, and Albini, Thomas A.
- Published
- 2019
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38. Intrinsic torque reversals induced by magnetic shear effects on the turbulence spectrum in tokamak plasmasa)
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Lu, ZX, Wang, WX, Diamond, PH, Tynan, G, Ethier, S, Gao, C, and Rice, J
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Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Classical Physics ,Fluids & Plasmas - Abstract
Intrinsic torque, which can be generated by turbulent stresses, can induce toroidal rotation in a tokamak plasma at rest without direct momentum injection. Reversals in intrinsic torque have been inferred from the observation of toroidal velocity changes in recent lower hybrid current drive (LHCD) experiments. This work focuses on understanding the cause of LHCD-induced intrinsic torque reversal using gyrokinetic simulations and theoretical analyses. A new mechanism for the intrinsic torque reversal linked to magnetic shear (͉) effects on the turbulence spectrum is identified. This reversal is a consequence of the ballooning structure at weak ͉. Based on realistic profiles from the Alcator C-Mod LHCD experiments, simulations demonstrate that the intrinsic torque reverses for weak ͉ discharges and that the value of ͉ crit is consistent with the experimental results ͉critexp ≈ 0.2 ∼ 0.3 [Rice et al., Phys. Rev. Lett. 111, 125003 (2013)]. The consideration of this intrinsic torque feature in our work is important for the understanding of rotation profile generation at weak ͉ and its consequent impact on macro-instability stabilization and micro-turbulence reduction, which is crucial for ITER. It is also relevant to internal transport barrier formation at negative or weakly positive ͉.
- Published
- 2015
39. The TAOS Project: Results From Seven Years of Survey Data
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Zhang, Z. -W., Lehner, M. J., Wang, J. -H., Wen, C. -Y., Wang, S. -Y., King, S. -K., Granados, Á. P., Alcock, C., Axelrod, T., Bianco, F. B., Byun, Y. -I., Chen, W. P., Coehlo, N. K., Cook, K. H., de Pater, I., Kim, D. -W., Lee, T., Lissauer, J. J., Marshall, S. L., Protopapas, P., Rice, J. A., and Schwamb, M. E.
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Astrophysics - Earth and Planetary Astrophysics - Abstract
The Taiwanese-American Occultation Survey (TAOS) aims to detect serendipitous occultations of stars by small (about 1 km diameter) objects in the Kuiper Belt and beyond. Such events are very rare (<0.001 events per star per year) and short in duration (about 200 ms), so many stars must be monitored at a high readout cadence. TAOS monitors typically around 500 stars simultaneously at a 5 Hz readout cadence with four telescopes located at Lulin Observatory in central Taiwan. In this paper, we report the results of the search for small Kuiper Belt Objects (KBOs) in seven years of data. No occultation events were found, resulting in a 95% c.l. upper limit on the slope of the faint end of the KBO size distribution of q = 3.34 to 3.82, depending on the surface density at the break in the size distribution at a diameter of about 90 km., Comment: 11 pages, 9 figures. Submitted to Astronomical Journal 2013 January 16
- Published
- 2013
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40. Politicizing Critical Pedagogies for the Logic of Late Capitalism
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Rice, J. A.
- Abstract
In current critical pedagogy theory, the term "globalization" frequently signifies the rapid homogenization and structural equivalency of material and intellectual differences into a unified, transnational, capitalist rationality. For many composition scholars, this homogeneity signals an interpellation of not just subjects, but any and all differing rhetorical logics. Different nations' peoples, goods, and cultures can interact, but only insofar as the "flowing" aspects of information are determined by the hegemonic and political functions of "the" global language. Though the loss of national and cultural autonomy is almost a prerequisite for globalizing processes, the much more pressing aspect here is the structural dependence on the frictionless exchange between so-called identical contexts. Because information can be exchanged according to the same material and rhetorical presuppositions worldwide, qualitative contextual differences are traded for a paradigm of material and epistemological equivalency. Several critical theories and pedagogies show that globalization complicates current classroom situations far beyond traditional humanist concerns of interpretive emancipation, rhetorical freedom, and civic agency, they likewise demonstrate that acceptance of communicative homogeneity does not make room for systemic differences in either rhetoric or knowledge. If globalization homogenizes discursive possibilities and reduces knowledge to practical utility, can liberatory strategies authorize, either pedagogically or theoretically, spaces for effective social and communicative resistance? To what extent are critical pedagogies' methods and goals commensurate with the restrictive logic of globalization? Since knowledge production, market applicability, and differential rhetorics produce a new pedagogical horizon, how might teachers develop strategies that intervene, and perhaps alter, hegemonic communicative processes? In an effort to complicate and extend these questions, this article suggests that not only the goals and methodologies for liberatory teaching, but also its practical potential for bringing about viable pedagogical and communicative alternatives in a globalized world are fundamentally rethought. Specifically, this article rejects critical pedagogy's humanist and liberal-democratic methodologies on the grounds that they work with, not against, the globalizing processes of capitalism. In their place, the author argues for a return to the speculative dimension historically associated with critical theory and pedagogy.
- Published
- 2008
41. The Magnetic Topology of the Weak-Lined T Tauri Star V410 - A Simultaneous Temperature and Magnetic Field Inversion
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Carroll, T. A., Strassmeier, K. G., Rice, J. B., and Kuenstler, A.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
We present a detailed temperature and magnetic investigation of the T Tauri star V410 Tau by means of a simultaneous Doppler- and Zeeman-Doppler Imaging. Moreover we introduce a new line profile reconstruction method based on a singular value decomposition (SVD) to extract the weak polarized line profiles. One of the key features of the line profile reconstruction is that the SVD line profiles are amenable to radiative transfer modeling within our Zeeman-Doppler Imaging code iMap. The code also utilizes a new iterative regularization scheme which is independent of any additional surface constraints. To provide more stability a vital part of our inversion strategy is the inversion of both Stokes I and Stokes V profiles to simultaneously reconstruct the temperature and magnetic field surface distribution of V410 Tau. A new image-shear analysis is also implemented to allow the search for image and line profile distortions induced by a differential rotation of the star. The magnetic field structure we obtain for V410 Tau shows a good spatial correlation with the surface temperature and is dominated by a strong field within the cool polar spot. The Zeeman-Doppler maps exhibit a large-scale organization of both polarities around the polar cap in the form of a twisted bipolar structure. The magnetic field reaches a value of almost 2 kG within the polar region but smaller fields are also present down to lower latitudes. The pronounced non-axisymmetric field structure and the non-detection of a differential rotation for V410 Tau supports the idea of an underlying $\alpha^2$-type dynamo, which is predicted for weak-lined T Tauri stars., Comment: Accepted for A&A, 18 pages, 10 figures
- Published
- 2012
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42. Deliberating performance targets workshop: Potential paths for emerging PM2.5 and O3 air sensor progress
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Williams, R., Duvall, R., Kilaru, V., Hagler, G., Hassinger, L., Benedict, K., Rice, J., Kaufman, A., Judge, R., Pierce, G., Allen, G., Bergin, M., Cohen, R.C., Fransioli, P., Gerboles, M., Habre, R., Hannigan, M., Jack, D., Louie, P., Martin, N.A., Penza, M., Polidori, A., Subramanian, R., Ray, K., Schauer, J., Seto, E., Thurston, G., Turner, J., Wexler, A.S., and Ning, Z.
- Published
- 2019
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43. Surficial geology, Lac aux Goélands, Quebec, NTS 23-P southeast
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Paulen, R C, primary, Rice, J M, additional, and Ross, M, additional
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- 2022
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44. Quaternary geology of the south Core Zone area, Quebec and Labrador
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Rice, J M, primary, Paulen, R C, additional, Ross, M, additional, McClenaghan, M B, additional, and Campbell, HE, additional
- Published
- 2022
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45. Binary-induced magnetic activity? Time-series echelle spectroscopy and photometry of HD123351 = CZ CVn
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Strassmeier, K. G., Carroll, T. A., Weber, M., Granzer, T., Bartus, J., Olah, K., and Rice, J. B.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
We present a first and detailed study of the bright and active K0IV-III star HD 123351. The star is found to be a single-lined spectroscopic binary with a period of 147.8919+-0.0003 days and a large eccentricity of e=0.8086+-0.0001. The rms of the orbital solution is just 47 m/s, making it the most precise orbit ever obtained for an active binary system. The rotation period is constrained from long-term photometry to be 58.32+-0.01 days. It shows that HD 123351 is a very asynchronous rotator, rotating five times slower than the expected pseudo-synchronous value. Two spotted regions persisted throughout the 12 years of our observations. Four years of Halpha, CaII H&K and HeI D3 monitoring identifies the same main periodicity as the photometry but dynamic spectra also indicate that there is an intermittent dependence on the orbital period, in particular for Ca ii H&K in 2008. Line-profile inversions of a pair of Zeeman sensitive/insensitive iron lines yield an average surface magnetic-flux density of 542+-72 G. The time series for 2008 is modulated by the stellar rotation as well as the orbital motion, such that the magnetic flux is generally weaker during times of periastron and that the chromospheric emissions vary in anti-phase with the magnetic flux. We also identify a broad and asymmetric lithium line profile and measure an abundance of log n(Li) = 1.70+-0.05. The star's position in the H-R diagram indicates a mass of 1.2+-0.1 Msun and an age of 6-7 Gyr. We interpret the anti-phase relation of the magnetic flux with the chromospheric emissions as evidence that there are two magnetic fields present at the same time, a localized surface magnetic field associated with spots and a global field that is oriented towards the (low-mass) secondary component.
- Published
- 2011
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46. Doppler imaging of the helium-variable star a Cen
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Bohlender, David A., Rice, J. B., and Hechler, P.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
The helium-peculiar star a Cen exhibits line profile variations of elements such as iron, nitrogen and oxygen in addition to its well-known extreme helium variability. New high S/N, high-resolution spectra are used to perform a quantitative measurement of the abundances of the star and determine the relation of the concentrations of the heavier elements on the surface of the star to the helium concentration and the magnetic field orientation. Doppler images have been created using programs described in earlier papers by Rice and others. An alternative surface abundance mapping code has been used to model the helium line variations after our Doppler imaging of certain individual helium lines produced mediocre results. We confirm the long-known existence of helium-rich and helium-poor hemispheres on a Cen and we measure a difference of more than two orders of magnitude in helium abundance from one side of the star to the other. Helium is overabundant by a factor of about 5 over much of the helium-rich hemisphere. Of particular note is our discovery that the helium-poor hemisphere has a very high abundance of helium-3, approximately equal to the helium-4 abundance. a Cen is therefore a new member of the small group of helium-3 stars and the first well-established magnetic member of the class. For the three metals investigated here, there are two strong concentrations of abundance near the equator consistent with the positive magnetic maximum and two somewhat weaker concentrations of abundance where the helium concentration is centered and roughly where the negative peak of the magnetic field would be found. Another strong concentration is found near the equator and this is not explainable in terms of any simple symmetry with the helium abundance or the apparent magnetic field main polar locations., Comment: 9 pages, 9 figures
- Published
- 2010
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47. The TAOS Project Stellar Variability II. Detection of 15 Variable Stars
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Mondal, S., Lin, C. C., Chen, W. P., Zhang, Z. -W., Alcock, C., Axelrod, T., Bianco, F. B., Byun, Y. -I., Coehlo, N. K., Cook, K. H., Dave, R., Kim, D. -W., King, S. -K., Lee, T., Lehner, M. J., Lin, H. -C., Marshal, S. L., Protopapas, P., Rice, J. A., Schwamb, M. E., Wang, J. -H., Wang, S. -Y., and Wen, C. -Y.
- Subjects
Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
The Taiwanese-American Occultation Survey (TAOS) project has collected more than a billion photometric measurements since 2005 January. These sky survey data-covering timescales from a fraction of a second to a few hundred days-are a useful source to study stellar variability. A total of 167 star fields, mostly along the ecliptic plane, have been selected for photometric monitoring with the TAOS telescopes. This paper presents our initial analysis of a search for periodic variable stars from the time-series TAOS data on one particular TAOS field, No. 151 (RA = 17$^{\rm h}30^{\rm m}6\fs$67, Dec = 27\degr17\arcmin 30\arcsec, J2000), which had been observed over 47 epochs in 2005. A total of 81 candidate variables are identified in the 3 square degree field, with magnitudes in the range 8 < R < 16. On the basis of the periodicity and shape of the lightcurves, 29 variables, 15 of which were previously unknown, are classified as RR Lyrae, Cepheid, delta Scuti, SX Phonencis, semi-regular and eclipsing binaries., Comment: 20 pages, 6 figures, accepted in The Astronomical Journal
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- 2010
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48. The TAOS Project: Statistical Analysis of Multi-Telescope Time Series Data
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Lehner, M. J., Coehlo, N. K., Zhang, Z. -W., Bianco, F. B., Wang, J. -H., Rice, J. A., Protopapas, P., Alcock, C., Axelrod, T., Byun, Y. -I., Chen, W. P., Cook, K. H., de Pater, I., Kim, D. -W., King, S. -K., Lee, T., Marshall, S. L., Schwamb, M. E., Wang, S. -Y., and Wen, C. -Y.
- Subjects
Astrophysics - Earth and Planetary Astrophysics - Abstract
The Taiwanese-American Occultation Survey (TAOS) monitors fields of up to ~1000 stars at 5 Hz simultaneously with four small telescopes to detect occultation events from small (~1 km) Kuiper Belt Objects (KBOs). The survey presents a number of challenges, in particular the fact that the occultation events we are searching for are extremely rare and are typically manifested as slight flux drops for only one or two consecutive time series measurements. We have developed a statistical analysis technique to search the multi-telescope data set for simultaneous flux drops which provides a robust false positive rejection and calculation of event significance. In this paper, we describe in detail this statistical technique and its application to the TAOS data set., Comment: 15 pages, 14 figures. Submitted to PASP
- Published
- 2010
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49. The TAOS Project: Upper Bounds on the Population of Small KBOs and Tests of Models of Formation and Evolution of the Outer Solar System
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Bianco, F. B., Zhang, Z. -W., Lehner, M. J., Mondal, S., King, S. -K., Giammarco, J., Holman, M. J., Coehlo, N. K., Wang, J. -H., Alcock, C., Axelrod, T., Byun, Y. -I., Chen, W. P., Cook, K. H., Dave, R., de Pater, I., Kim, D. -W., Lee, T., Lin, H. -C., Lissauer, J. J., Marshall, S. L., Protopapas, P., Rice, J. A., Schwamb, M. E., Wang, S. -Y., and Wen, C. -Y.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We have analyzed the first 3.75 years of data from TAOS, the Taiwanese American Occultation Survey. TAOS monitors bright stars to search for occultations by Kuiper Belt Objects (KBOs). This dataset comprises 5e5 star-hours of multi-telescope photometric data taken at 4 or 5 Hz. No events consistent with KBO occultations were found in this dataset. We compute the number of events expected for the Kuiper Belt formation and evolution models of Pan & Sari (2005), Kenyon & Bromley (2004), Benavidez & Campo Bagatin (2009), and Fraser (2009). A comparison with the upper limits we derive from our data constrains the parameter space of these models. This is the first detailed comparison of models of the KBO size distribution with data from an occultation survey. Our results suggest that the KBO population is comprised of objects with low internal strength and that planetary migration played a role in the shaping of the size distribution., Comment: 18 pages, 16 figures, Aj submitted
- Published
- 2010
- Full Text
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50. The TAOS Project Stellar Variability I. Detection of Low-Amplitude delta Scuti Stars
- Author
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Kim, D. -W., Protopapas, P., Alcock, C., Byun, Y. -I., Kyeong, J., Lee, B. -C., Wright, N. J., Axelrod, T., Bianco, F. B., Chen, W. -P., Coehlo, N. K., Cook, K. H., Dave, R., King, S. -K., Lee, T., Lehner, M. J., Lin, H. -C., Marshall, S. L., Porrata, R., Rice, J. A., Schwamb, M. E., Wang, J. -H., Wang, S. -Y., Wen, C. -Y., and Zhang, Z. -W.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
We analyzed data accumulated during 2005 and 2006 by the Taiwan-American Occultation Survey (TAOS) in order to detect short-period variable stars (periods of <~ 1 hour) such as delta Scuti. TAOS is designed for the detection of stellar occultation by small-size Kuiper Belt Objects (KBOs) and is operating four 50cm telescopes at an effective cadence of 5Hz. The four telescopes simultaneously monitor the same patch of the sky in order to reduce false positives. To detect short-period variables, we used the Fast Fourier Transform algorithm (FFT) inasmuch as the data points in TAOS light-curves are evenly spaced. Using FFT, we found 41 short-period variables with amplitudes smaller than a few hundredths of a magnitude and periods of about an hour, which suggest that they are low-amplitude delta Scuti stars (LADS). The light-curves of TAOS delta Scuti stars are accessible online at the Time Series Center website (http://timemachine.iic.harvard.edu), Comment: Accepted for publication in AJ
- Published
- 2009
- Full Text
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