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Neutron star mass-radius relation with gravitational field shielding by a scalar field

research in Astronomy and Astrophysics 2013年第5期13卷 571-578页

作者： Bo-Jun Zhang Tian-Xi Zhang Padmaja guggilla Mostafa Dokhanian Department of Physics and Astronomy Vanderbilt University Department of Physics Alabama A & M University National Astronomical Observatories Chinese Academy of Sciences

The currently well-developed models for equations of state （EoSs） have been severely impacted by recent measurements of neutron stars with a small radius and/or large mass. To explain these measurements, the theory of gravitational field shielding by a scalar field is applied. This theory was recently developed in accor- dance with the five-dimensional （5D） fully covariant Kaluza-Klein （KK） theory that has successfully unified Einstein＇s general relativity and Maxwell＇s electromagnetic theory. It is shown that a massive, compact neutron star can generate a strong scalar field, which can significantly shield or reduce its gravitational field, thus making it more massive and more compact. The mass-radius relation developed under this type of modified gravity can be consistent with these recent measurements of neutron stars. In addition, the effect of gravitational field shielding helps explain why the supernova explosions of some very massive stars （e.g.9 40 MQ as measured recently） actually formed neutron stars rather than black holes as expected. The EoS models, ruled out by measurements of small radius and/or large mass neutron stars according to the the- ory of general relativity, can still work well in terms of the 5D fully covariant KK theory with a scalar field.

关键词： stars: neutron -- gravitation -- black hole physics -- equation of state

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固定低剂量三联抗高血压药物与常规治疗对斯里兰卡轻度至中度高血压患者血压控制的疗效差异:一项随机临床试验

引用

中华高血压杂志 2018年第12期26卷 1130-1130页

作者： Web-ster r Salam A de Silva HA Selak V Stepien S rajapakse S Amarasekara S Amarasena N Billot L de Silva AP Fernando M guggilla r Jan S Jayawardena J Maulik PK Mendis S Munasinghe J Naik N Prabhakaran D ranasinghe G Thom S Tisserra N Senaratne V Wijekoon S Wijeyasingam S rodgers A Patel A 刘莉叶鹏

控制不良的高血压是全球领先的公共卫生问题,需要新的治疗策略。该研究评估低剂量三联抗高血压药物治疗是否能达到比常规治疗更好的血压控制。研究者纳入2016年2月至2017年5月在斯里兰卡11所城市医院诊所就诊的需要开始抗高血压治疗(未... 详细信息

控制不良的高血压是全球领先的公共卫生问题,需要新的治疗策略。该研究评估低剂量三联抗高血压药物治疗是否能达到比常规治疗更好的血压控制。研究者纳入2016年2月至2017年5月在斯里兰卡11所城市医院诊所就诊的需要开始抗高血压治疗(未治疗的患者)或接受单药治疗的患者,进行低剂量三联降压与常规治疗比较的随机、开放性试验,随访至2017年10月。

关键词：高血压患者随机临床试验抗高血压药物常规治疗血压控制斯里兰卡低剂量疗效差异

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revolutionizing Material Boundaries: High-Performance Diamond-Coated Steel via Long-Term MPCVD

引用

Journal of Minerals and Materials Characterization and Engineering 2024年第6期12卷 334-345页

作者： Clyde Varner II Angela Davis Leslie Wilson Padmaja guggilla Department of Physics Chemistry and Mathematics College of Engineering Technology and Physical Sciences Alabama A&M University Normal AL USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN USA

This research explores Microwave Plasma Chemical Vapor Deposition (MPCVD) for depositing diamond films on steel alloys (316L, 4140, and 1018) with a vanadium carbide interlayer to enhance adhesion and compatibility. The study reveals that a soft vanadium carbide interlayer and the FCC lattice match lead to a Ta-C film. The results of the graphite inhibition and diamond deposition varied with the steel alloy underlayer composition. In the 316L steel alloy, we successfully formed a thick, compressive strain-induced, sp3-bonded tetrahedral amorphous carbon layer without graphite. The findings have wide-ranging applications in environments demanding high durability and thermal conductivity.

关键词： MPCVD (Microwave Plasma Chemical Vapor Deposition) raman Spectroscopy Steel Alloys (316L 4140 1018) Coatings Chip-resistance

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Pyroelectric Properties of PVDF:MWCNT Nanocomposite Film for Uncooled Infrared Detectors

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Materials Sciences and Applications 2012年第12期3卷 851-855页

作者： Matthew E. Edwards Ashok K. Batra Ashwith K. Chilvery Padmaja guggilla Michael Curley Mohan D. Aggarwal Department of Physics Chemistry and Mathematics Alabama A&M University Normal AL 35762 USA

Pyroelectric multi-walled carbon nanotubes:polyvinylidene fluoride (PVDF:MWCT) composite films have been fabriccated by the solution casting technique. The pyroelectric and dielectric properties of the composite films were examined for their use in uncooled infrared detectors. The properties measured include: 1) dielectric constants and 2) pyroelec- tric coefficient as a function of temperature. From the foregoing parameters, materials Figures-of-merit, for infrared detection and thermal-vidicons, were calculated. The results indicated Figures-of-merit of composite film were higher than pristine polyvinylidene fluoride films.

关键词： Pyroelectric Ir Detectors Multi-Walled Carbon Nanotubes Pyroelectric Properties

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