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34 results on '"Joseph, J.S."'

13. Two RuII linkage isomers with distinctly different charge transfer photophysics

Author

24th international symposium on the photochemistry and photophysics of coordination compounds ISPPCC (24: 24 au 29/07/2022: Vancouver), Tisaun, Jérôme, Laramée-Milette, Baptiste, Beckwith, Joseph J.S., Bierwagen, Jakob, Hanan, Garry S., Reber, Christian, Hauser, Andreas, Moucheron, Cécile, 24th international symposium on the photochemistry and photophysics of coordination compounds ISPPCC (24: 24 au 29/07/2022: Vancouver), Tisaun, Jérôme, Laramée-Milette, Baptiste, Beckwith, Joseph J.S., Bierwagen, Jakob, Hanan, Garry S., Reber, Christian, Hauser, Andreas, and Moucheron, Cécile

Abstract

info:eu-repo/semantics/nonPublished

Published
2022

14. Two RuIILinkage Isomers with Distinctly Different Charge Transfer Photophysics

Author

Tisaun, Jérôme, Laramée-Milette, Baptiste, Beckwith, Joseph J.S., Bierwagen, Jakob, Hanan, Garry G.S., Reber, Christian, Hauser, Andreas, Moucheron, Cécile, Tisaun, Jérôme, Laramée-Milette, Baptiste, Beckwith, Joseph J.S., Bierwagen, Jakob, Hanan, Garry G.S., Reber, Christian, Hauser, Andreas, and Moucheron, Cécile

Abstract

The ligand PHEHAT (PHEHAT = 1,10-phenanthrolino[5,6-b]1,4,5,8,9,12-hexaazatriphenylene) presents a structural asymmetry that has a dramatic influence on the photophysical properties depending on the chelation site of the metal ion in the linkage isomers. While [RuII(phen)2HATPHE]2+ behaves classically, like [RuII(bpy)3]2+, [RuII(phen)2PHEHAT]2+ exhibits an unusual behavior. It appears that this complex has two 3MLCT bright states, the lower one being weakly emissive or nonemissive depending on the solvent and temperature. Different photophysical techniques involving a wide range of various temperatures and timescales are essential to analyze this difference. A full photophysical scheme is proposed based on experimental data and density functional theory calculations. While previous studies focused on high temperatures and longer timescale emission, we explore the complexes at very low temperatures and very short times in order to obtain a more complete picture of the intriguing photophysical behavior of these complexes., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2021

15. Classic and High-Enthalpy Hypersonic Flows

Author

Joseph J.S. Shang and Joseph J.S. Shang

Subjects
Aerodynamics, Hypersonic, Enthalpy
Abstract

Classic and High-Enthalpy Hypersonic Flows presents a complete look at high-enthalpy hypersonic flow from a review of classic theories to a discussion of future advances centering around the Born-Oppenheim approximation, potential energy surface, and critical point for transition. The state-of-the-art hypersonic flows are defined by a seamless integration of the classic gas dynamic kinetics with nonequilibrium chemical kinetics, quantum transitions, and radiative heat transfer. The book is intended for graduate students studying advanced aerodynamics and taking courses in hypersonic flow. It can also serve as a professional reference for practicing aerospace and mechanical engineers of high-speed aerospace vehicles and propulsion system research, design, and evaluation.Features Presents a comprehensive review of classic hypersonic flow from the Newtonian theory to blast wave analogue. Introduces nonequilibrium chemical kinetics to gas dynamics for hypersonic flows in the high-enthalpy state. Integrates quantum mechanics to high-enthalpy hypersonic flows including dissociation and ionization. Covers the complete heat transfer process with radiative energy transfer for thermal protection of earth reentry vehicle. Develops and verifies the interdisciplinary governing equations for understanding and analyzing realistic hypersonic flows.

Published
2023

16. Toward the construction of a fourth-order difference scheme for transient EM wave simulation: staggered grid approach

Author

Young, Jeffrey L., Gaitonde, Datta, and Shang, Joseph J.S.

Subjects
Antennas (Electronics) -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A compact central-difference approximation in conjunction with the Yee grid is used to compute the spatial derivatives in Maxwell's equations. To advance the semi-discrete equations, the four-stage Runge-Kutta (RK) integrator is invoked. This combination of spatial and temporal differencing leads to a scheme that is fourth-order accurate, conditionally stable, and highly efficient. Moreover, the use of compact differencing allows one to apply the compact operator in the vicinity of a perfect conductor - an attribute not found in other higher order methods. Results are provided that quantify the spectral properties of the method. Simulations are conducted on problem spaces that span one and three dimensions and whose domains are of the open and closed type. Results from these simulations are compared with exact closed-form solutions; the agreement between these results is consistent with numerical analysis. Index Terms - FDTD methods.

Published
1997

20. Homogeneous gas-phase reaction of Hg° with H2O2, 03, CH3I, AND (CH3)2S: Implications for atmospheric Hg cycling

Author

Eric Prestbo, Julie A. Calhoun, Björn Hall, and Joseph J.S. Tokos

Subjects
Detection limit, Atmospheric Science, Ozone, Inorganic chemistry, chemistry.chemical_element, Chemical reaction, Mercury (element), chemistry.chemical_compound, Reaction rate constant, chemistry, Dimethyl sulfide, Hydrogen peroxide, General Environmental Science, Methyl iodide
Abstract

In order to better define the cycling of mercury in the global troposphere, we have studied over the past four years the homogeneous gas-phase reaction of elemental mercury (Hg0) with hydrogen peroxide (H2O2), 03, methyl iodide (CH3I), and dimethyl sulfide ((CH3)2S or DMS) in FEP Teflon® reactors. For the first time, we report laboratory measurements of the reaction rate constant of Hg0 with H202. Results which were at or below our detection limit suggest this reaction must have a rate constant of

Published
1998
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21. Higher methadone doses are associated with lower mortality in patients of opioid dependence in Taiwan

Author

Wen-Yi Shih, Joseph J.S. Cheng, Chia-Jung Hsieh, Chia-Hsiang Chen, Pau-Chung Chen, Ding-Lieh Liao, and Yen-Fang Huang

Subjects
Adult, Male, medicine.medical_specialty, media_common.quotation_subject, Taiwan, HIV Infections, Internal medicine, Risk of mortality, Opiate Substitution Treatment, Medicine, Humans, Mortality, Biological Psychiatry, media_common, Proportional Hazards Models, Retrospective Studies, business.industry, Proportional hazards model, Addiction, Mortality rate, Middle Aged, Opioid-Related Disorders, Psychiatry and Mental health, Standardized mortality ratio, Opioid, Relative risk, Anesthesia, Female, business, Methadone, medicine.drug, Follow-Up Studies
Abstract

Optimal methadone dosage and service profile is challenging in treatment of opioid dependence. This study explores the impact of methadone dosage on the mortality of opioid-dependent patients in methadone maintenance therapy by using a large-scale and continual supervised dosing registry information system. Database of nationwide enrolled opioid-dependent patients at methadone clinics in Taiwan during 2006-2008 was assessed. The relative risk of age, sex, marital status, HIV infection and methadone dosage were analyzed by Cox regression analysis. Among all of the 33,549 recruited patients, the crude mortality rate was 134.78/10,000 person-years, and the standardized mortality ratio was 4.68. A dose-response relationship of higher- vs. lower-dosage groups on the risk of mortality risk was observed (adjusted HR = 0.68, P = 0.016). In further sub-grouping analysis, this trend was more significant in HIV positive patients, in subgroup of patients who continuously staying in MMT, and in subgroup of patients who re-enter MMT. This dosage effect is not significantly seen in patients receiving MMT more than 365 days. Further exploration of other treatment-related factors may be important for understanding the long-term treatment outcome of opioid addiction patients.

Published
2012

22. Microscale thermophoresis quantifies biomolecular interactions under previously challenging conditions

Author

Seidel, S.A., Dijkman, P.M., Lea, W.A., Bogaart, G. van den, Jerabek-Willemsen, M., Lazic, A., Joseph, J.S., Srinivasan, P., Baaske, P., Simeonov, A., Katritch, I., Melo, F.A., Ladbury, J.E., Schreiber, G., Watts, A., Braun, D., Duhr, S., Seidel, S.A., Dijkman, P.M., Lea, W.A., Bogaart, G. van den, Jerabek-Willemsen, M., Lazic, A., Joseph, J.S., Srinivasan, P., Baaske, P., Simeonov, A., Katritch, I., Melo, F.A., Ladbury, J.E., Schreiber, G., Watts, A., Braun, D., and Duhr, S.

Abstract

Contains fulltext : 118804.pdf (publisher's version ) (Open Access), Microscale thermophoresis (MST) allows for quantitative analysis of protein interactions in free solution and with low sample consumption. The technique is based on thermophoresis, the directed motion of molecules in temperature gradients. Thermophoresis is highly sensitive to all types of binding-induced changes of molecular properties, be it in size, charge, hydration shell or conformation. In an all-optical approach, an infrared laser is used for local heating, and molecule mobility in the temperature gradient is analyzed via fluorescence. In standard MST one binding partner is fluorescently labeled. However, MST can also be performed label-free by exploiting intrinsic protein UV-fluorescence. Despite the high molecular weight ratio, the interaction of small molecules and peptides with proteins is readily accessible by MST. Furthermore, MST assays are highly adaptable to fit to the diverse requirements of different biomolecules, such as membrane proteins to be stabilized in solution. The type of buffer and additives can be chosen freely. Measuring is even possible in complex bioliquids like cell lysate allowing close to in vivo conditions without sample purification. Binding modes that are quantifiable via MST include dimerization, cooperativity and competition. Thus, its flexibility in assay design qualifies MST for analysis of biomolecular interactions in complex experimental settings, which we herein demonstrate by addressing typically challenging types of binding events from various fields of life science.

Published
2013

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