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World Journal of Cardiology 2024年第7期16卷 402-411页

作者： Taha Teaima Gianfranco Bittar Carlini Rohan A gajjar Imran Aziz Sami J Shoura Abdul-Rahim Shilbayeh Naim Battikh Tareq Alyousef Division of Cardiology Department of MedicineJohn H.StrogerJr.Hospital of Cook CountyChicagoIL 60612United States

BACKGROUND Transcatheter aortic valve replacement(TAVR)is a revolutionary procedure for severe aortic *** coexistence of chronic kidney disease(CKD)and TAVR introduces a challenge that significantly impacts patient *** To define readmission rates,predictors,and causes after TAVR procedure in CKD stage 1-4 *** We used the national readmission database 2018 and 2020 to look into readmission rates,causes and predictors after TAVR procedure in patients with CKD stage *** Out of 24758 who underwent TAVR and had CKD,7892(32.4%)patients were readmitted within 90 days,and had higher adjusted odds of being females(adjusted odds ratio:1.17,95%CI:1.02-1.31,P=0.02)with longer length of hospital stay>6 days,and more comorbidities including but not limited to diabetes mellitus,anemia,and congestive heart failure(CHF).CONCLUSION Most common causes of readmission included CHF(18.0%),sepsis,and complete atrioventricular *** readmission predictors with very close followup is warranted to prevent such high rate of readmission.

关键词： Chronic kidney disease Transcatheter aortic valve replacement Readmission Predictors Rates

The Bright Single Pulse Emission from PSR B1133+16

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Research in Astronomy and Astrophysics 2024年第4期24卷 253-261页

作者： Jun Tan Zhi-Gang Wen Zhen Wang Xue-Feng Duan Hong-Guang Wang Na Wang Vishal gajjar Jian-Ping Yuan Rai Yuen Wen-Ming Yan Jian-Ling Chen Wei Han Hui Wang Cheng-Bing Lyu Ai-Jun Dong Maths and Information Technology School Yuncheng UniversityYuncheng 044000China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Space Science Laboratory University of CaliforniaBerkeley 94710USA Department of Physics and Electronic Engineering Yuncheng UniversityYuncheng 044000China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China

We have conducted a comprehensive investigation into the bright single pulse emission from PSR B1133+16using the Giant Metrewave Radio *** time resolution data(61μs)were obtained at a center frequency of 322 MHz with a bandwidth of 32 MHz over a continuous observation period of 7.45 hr.A total of 1082 bright pulses were sporadically detected with peak flux densities ranging from 10 to 23 times stronger than the average pulse ***,no giant pulse-like emission with a relative pulse energy larger than 10 and extremely short duration was detected,indicating that these bright pulses cannot be categorized as giant pulse *** majority of these bright pulses are concentrated in pulse phases at both the leading and trailing windows of the average pulse profile,with an occurrence ratio of approximately *** pulse energy distribution for all individual pulses can be described by a combination of two Gaussian components and a cutoff power-law with an index of α=-*** updated nulling fraction of 15.35%±0.45% was determined from the energy *** emission of individual pulses follows a log-normal distribution in peak flux density *** is imperative that regular phase drifting in bright pulse sequence is identified in both the leading and trailing components for the first *** physical mechanisms are discussed in detail to provide insights into these observations.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(PSR B1133+16) methods:observational methods:data analysis

Computer Simulation Study of Thermal Conduction in 1D Chains of Anharmonic Oscillators

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Communications in Theoretical Physics 2013年第3期59卷 361-364页

作者： Tejal N.Shah P.N.gajjar Bhavan's Sheth R.A.College of Science KhanpurAhmedabad 380 001GujaratIndia Department of Physics University School of SciencesGujarat UniversityAhmedabad 380 009GujaratIndia

In this work thermal conduction in one-dimensional(1D) chains of anharmonic oscillators are studied using computer *** temperature profile,heat flux and thermal conductivity are investigated for chain length N = 100,200,400,800 and *** the computer simulation anharmonicity is introduced due to Fermi-Pasta-Ulam-β(FPU-β) *** substrate interaction,an onsite potential due to Frenkel-Kontorova(FK) model has been *** simulations demonstrate that temperature gradient scales behave as N-1 linearly with the relation J = 0.1765/*** the thermal conductivity K,KN to N obey the linear relation of the type KN = *** is shown that thermal transport is dependent on phonon-phonon interaction as well as phonon-lattice *** thermal conductivity increases linearly with increase inanharmonicity and predicts relation κ = 0.133 + 0.804β.It is also concluded that for higher value of the strength of the onsite potential system tends to a thermal insulator.

关键词：计算机模拟一维链振荡器热传导线性关系相互作用热导率温度分布

Structure of Some 4f Rare Earth Liquid Metals --A Charged Hard Sphere Approach

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Communications in Theoretical Physics 2006年第2X期46卷 337-342页

作者： P.B. Thakor P.N. gajjar A.R. Jani Department of Physics Veer Nazmad South Gujarat University Udhana Magdalla Road Surat 395 007 Gujarat India Department of Physics Oujarat University Ahmedabd Oujarat India Department of Physics Sardar Patel University Vallabh Vidyanagar 388 120 Gujarat India

A well-established pseodopotential is used to study the structure of some 4f rare earth liquid metals (Ce, Pr, Eu, Gd, Tb, and Yb). The structure factor S(q), pair distribution function g(r), interatomic distance r1, and coordination number n1 are calculated using Charged Hard Sphere (CHS) reference system. To introduce the exchange and correlation effects, the local field correction due to Sarkar et al. (S) is applied. The present investigation is successful in generating the structural information of Ce, Pr, Eu, Gd, Tb, and Yb 4f rare earth liquid metals.

关键词：虚位势结构因子偶分布函数原子间距

A New Method for Characterizing Single Parametric Model Potential

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Communications in Theoretical Physics 2008年第9期50卷 763-766页

作者： P.S.Vyas P.N.gajjar B.Y.Thakore A.R.Jani Department of Physics Sardar Patel UniversityVallabh Vidyanagar 388 120GujaratIndia Department of Physics University School of SciencesGujarat UniversityAhmedabad 380 009GujaratIndia

描绘单身的参量的模型潜力的一条新奇途径被等同全部的对建议明智的力量到零。我们的生长得很好的单身的参量的模型潜力用建议想法被描绘并且把获得的参数与参数由以前使用的途径计算了作比较。因此描绘的 pseudopotential 然后被测试... 详细信息

描绘单身的参量的模型潜力的一条新奇途径被等同全部的对建议明智的力量到零。我们的生长得很好的单身的参量的模型潜力用建议想法被描绘并且把获得的参数与参数由以前使用的途径计算了作比较。因此描绘的 pseudopotential 然后被测试计算碱金属的全部的精力。结果建立在决定 pseudopotential 的参数使全部的对成为明智的力量到零的建议想法的可靠性。

关键词：碱金属原子间力容积系数参数模型

Some Properties of Si,Ge,and α-Sn Using Pseudopotential Theory

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Communications in Theoretical Physics 2010年第9期54卷 573-577页

作者： P.S.Vyas B.Y.Thakore P.N.gajjar A.R.Jani Department of Physics Sardar Patel University Department of Physics University School of SciencesGujarat University

在有我们的很好确定的单身的参量的模型潜力的第二份订单以外的 pseudopotential 理论被采用计算全部的水晶精力，静态的体积模量，在Jones地区脸和 Si 的压力卷关系(在压力下面的状态的方程)上的点 X 的精力乐队差距，用 Nagy 的静态... 详细信息

在有我们的很好确定的单身的参量的模型潜力的第二份订单以外的 pseudopotential 理论被采用计算全部的水晶精力，静态的体积模量，在Jones地区脸和 Si 的压力卷关系(在压力下面的状态的方程)上的点 X 的精力乐队差距，用 Nagy 的静态的本地域修正的 Ge 和 -Sn 工作。结果与那些相比使用很少获得另外的本地地修正功能。全部的精力的现在的结果在对试验性的数据的好同意。屏蔽功能完美地与 Ge 和 -Sn 的试验性的结果正在匹配的由 Nagy 的家计算的体积模量。一些偏差在精力乐队差距的价值被发现。

关键词：势理论属性锡体积弹性模量硅锗校正功能实验数据

Frequency independent quenching of pulsed emission

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Frequency independent quenching of pulsed emission

Modelling of Solar Thermal Power Plant Using Parabolic Trough Collector

中国天文学会2014年学术年会

作者： Vishal gajjar 中国科学院新疆天文台

＜正＞In this talk,the simultaneous occurrence of the nulling phenomena in three pulsars,PSRs B0031-07,B0809+74 and B2319+60,will be *** observations were conducted simultaneously at four different frequencies,313,607,1380 and 4850 MHz,from three different telescopes *** GMRT,the WSRT and the Effelsberg radio *** obtained the NF at

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Journal of Power and Energy Engineering 2016年第8期4卷 9-25页

作者： Jignasha Bhutka Jaymin gajjar T. Harinarayana Gujarat Energy Research & Management Institute (GERMI) Gandhinagar India

The target of the National Solar Mission is to build up India as a worldwide pioneer in solar energy generation. Solar power can be transmitted through grid either from solar photovoltaic or solar thermal technology. As compared to solar photovoltaic, solar thermal installations are less studied, especially regarding energy estimation and performance analysis. For estimating the potential of CSP plants, it is planned to simulate a power plant. We have marginally modified the design of 1 MW operational power plant installed at Gurgaon using Parabolic Trough Collector (PTC) technology. The results are compared with the expected output of Gurgaon power plant and also 50 MW power plant at Rajasthan. Our results have closely matched with a small deviation of 3.1% and 3.6% for Gurgaon and Rajasthan plants, respectively. Our developed model is also validated with 18 different solar power plants in different parts of the world by slightly modifying the parameters according to the plant capacity without changing major changes to the plant design. Difference between our results and the expected energy generation varied from 0.4% to 13.7% with an average deviation of 6.8%. As our results show less than 10% deviation as compared to the actual generation, an attempt has been made here to estimate the potential for the entire nation. For this modelling has been carried out for every grid station of 0.25° × 0.25° interval in India. Our results show that annual solar thermal power plant of 1 MWe capacity potential varies from 900 to 2700 MWh. We have also compared our results with previous studies and discussed.

关键词： Parabolic Trough Solar Thermal Power TRNSYS Simulation India

Solar PV Energy Generation Map of Karnataka, India

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Smart Grid and Renewable Energy 2015年第12期6卷 333-343页

作者： Jaymin gajjar Sagar Agravat T. Harinarayana Gujarat Energy Research & Management Institute (GERMI) Gandhinagar Gujarat India

A massive plan has been drawn by the Karnataka state of India to initiate several solar power plants at different locations. In view of this, it is of great help to have reliable estimation on solar PV energy generation. Four solar PV power plants in Karnataka state are fully operational installed by Karnataka Power Corporation Limited (KPCL). They are located at Kolar, Belgaum and Raichur with 3 MW capacity each and at Mandya with 5 MW capacity. In the present study, using ground mounted weather station data solar power generation has been estimated and compared with actual generation for two consecutive years of 2012 and 2013 for one location initially, namely 3 MW Kolar Solar PV Plant. The procedure is repeated for rest of the plants. The simulated results have been corrected with ground mounted weather data. After such corrections, the simulated results have been compared with the actual energy generation of the four plants. Results showed a close match with a small deviation of about 5%. The model then applied throughout the state for every 0.25 degree station intervals in a grid manner. The annual energy generation obtained for the state varies from 1.53 to 1.73 MUs/MW. Central and south eastern part of the state are found to yield significantly higher solar power generation as compared to the northern part and south western part of Karnataka. Interestingly, north western part of Kodagu district has shown the least potential of 1.53 MUs/MW as compared to other parts. This can be attributed mainly due to low irradiation and high temperature condition at this location. The energy generated map from our study will be useful and helpful for both solar developers and decision makers of Karnataka state.

关键词： Solar Energy Generation Map Solar Photovoltaic (PV) Plant Karnataka PVSyst Meteonorm KPCL Kolar Belgaum Raichur Mandya

Investigation of Mode Changing,Pulse Nulling and Subpulse Drifting Properties in the Asymmetric Conal Triple Radio Pulsar B2319+60

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Research in Astronomy and Astrophysics 2022年第11期22卷 147-160页

作者： Jian-Ling Chen Zhi-Gang Wen Hong-Guang Wang Na Wang Rai Yuen Vishal gajjar Jian-Ping Yuan Zhen Wang Wen-Ming Yan Jin-Peng Wang Cheng-Bing Lyu Hui Wang Xue-Feng Duan Department of Physics and Electronic Engineering Yuncheng UniversityYuncheng 044000China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Key Laboratory of Microwave Technology Urumqi 830011China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guiyang 550001China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Space Science Laboratory University of CaliforniaBerkeley 94710United States of America School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China

We report on a detailed analysis of the mode changing,nulling and subpulse drifting behavior of the conal triple pulsar B2319+60 at 1.5 GHz observed with the Nanshan 25 m radio *** pulsar’s profile can be interpreted as resulting from a sightline traverse which cuts across an outer cone and tangentially grazes an inner *** 30 per cent of nulls are found to create alternating bunches of nulls and emission in a quasi-periodic manner with an averaged fluctuation rate of about four rotation periods(P_(1)).The presence of two distinct drift modes(A and ABN)plus a phase-stationary non-drift emission mode(B)is confirmed,and each corresponds to a different pulse *** mode A is dominated by a phase modulation in the trailing component with a circulation time of around 7P_(1).In addition to a 3P_(1)phase modulation in the leading component,mode ABN presents an amplitude modulation in the leading and trailing components with a period of around 40P_(1).The emission region and geometry remain constant during mode *** diversity seen in the individual pulse behavior of the pulsar B2319+60 provides a unique window into the emission physics.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(PSR B2319+60) stars:neutron