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Study of Thermodynamics of Liquid Noble-metals Alloys Through a Pseudopotential Theory

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Communications in Theoretical Physics 2010年第9期54卷 551-558页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S.College of Diploma Engineering

The Gibbs-Bogoliubov (GB) inequality is applied to investigate the thermodynamic properties of someequiatomic noble metal alloys in liquid phase such as Au-Cu,Ag-Cu,and Ag-Au using well recognized *** description of the structure,well known Percus-Yevick (PY) hard sphere model is used as a *** applying a variation method the best hard core diameters have been found which correspond to minimumfree *** this procedure the thermodynamic properties such as entropy and heat of mixing have been *** influence of local held correction function viz;Hartree (H),Taylor (T),Ichimaru-Utsumi (IU),Farid et al.(F),and Sarkar et al.(S) is also *** computed results of the excess entropy compares favourably in the caseof liquid alloys while the agreement with experiment is poor in the case of heats of *** may be due to thesensitivity of the heats of mixing with the potential parameters and the dielectric function.

关键词： Gibbs-Bogoliubov (GB) inequality liquid noble metals binary alloys pseudopotential method Percus-Yevick (PY) hard sphere model local field correction functions thermodynamic properties

Electron Dispersion in Liquid Alkali and Their Alloys

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Communications in Theoretical Physics 2010年第7期54卷 159-166页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S.College of Diploma Engineering

Ashcroft 在秒顺序不安理论的本地空核心(EmC ) 模型 pseudopotential 被用来第一次为液体碱金属和他们的 equiatomic 二进制代码合金从免费电子价值在费密精力学习电子分散关系，费密精力，和偏差。在现在的计算， pseudo-alloy-atom ... 详细信息

Ashcroft 在秒顺序不安理论的本地空核心(EmC ) 模型 pseudopotential 被用来第一次为液体碱金属和他们的 equiatomic 二进制代码合金从免费电子价值在费密精力学习电子分散关系，费密精力，和偏差。在现在的计算， pseudo-alloy-atom 模型(泛美航空公司) 的使用被建议并且成立成功。本地地修正功能的六张不同表格的影响由 Hartree (H) 求婚了， VashishtaSingwi (对) ，泰勒(T) ， IchimaruUtsumi (IU ) ， Farid 等。(F) ，和 Sarkar 等。上述的电子性质上的(S) 明确地被检验，它反映屏蔽的变化效果。在液体碱的电子分散的否定驼峰的深度在顺序李 K 减少，除了 Rb 和 C，它增加。合金的结果在预兆的自然。

关键词：自由电子二元合金液体碱分散色散关系原子模型摄动理论费米能量

Stacking fault energy in some single crystals

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Journal of Semiconductors 2012年第6期33卷 1-5页

作者： aditya m.vora Humanities and Social Science Department

The stacking fault energy of single crystals has been reported using the peak shift *** studied all single crystals are grown by using a direct vapor transport（DVT） technique in the *** structural characterizations of these crystals are made by *** variations are shown in deformation （α） and growth（β） probabilities in single crystals due to off-stoichiometry,which possesses the stacking fault in the single crystal.

关键词： single crystals X-ray diffrectograms deformation probability growth probability stacking fault

Transport Properties of Si and Ge Liquid Semiconductor metals

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Communications in Theoretical Physics 2009年第3期51卷 550-554页

作者： aditya m.vora Humanities and Social Science Department S.T.B.S. College of Diploma Engineering

在现在的文章，我们第一次用众所周知的模型潜力学习电的抵抗力 ρ ，热电的力量(TEP )α ，热传导性 σ ，骑士移动和液体 Si 和 Ge 的骑士移动的温度系数。在现在的工作使用的结构因素从 Percus Yevick (PY ) 理论被导出。各种各样的... 详细信息

在现在的文章，我们第一次用众所周知的模型潜力学习电的抵抗力 ρ ，热电的力量(TEP )α ，热传导性 σ ，骑士移动和液体 Si 和 Ge 的骑士移动的温度系数。在现在的工作使用的结构因素从 Percus Yevick (PY ) 理论被导出。各种各样的本地领域修正功能被用来学习屏蔽影响。抵抗力的现在的结果在对的质的同意被发现可得到试验性、理论每当时存在。

关键词：金属液体输运性质体硅半导体锗温度系数结构因子校正功能

Effect of rhenium doping on various physical properties of single crystals of moSe_2

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Journal of Semiconductors 2012年第1期33卷 20-24页

作者： mihir m.vora aditya m.vora Parmeshwari 165 Vijaynagar Area Hospital RoadBhuj-Kutch370001GujaratIndia Humanities and Social Science Department S.T.B.S.College of Diploma EngineeringShri Swami Atmanand Sarswati Vidya SankulOpp.Kapodra Police StationVarachha RoadSurat 395006GujaratIndia

Effect of rhenium doping is examined in single crystals of moSe2 viz. moRe0.005Sel.995, moReo.o01 Sel.999 and moo.995Re0.005Se2, which is grown by using the direct vapor transport （DVT） technique. The grown crystals are structurally characterized by X-ray diffraction, by determining their lattice parameters a and c, and X-ray density. Also, the Hall effect and thermoelectric power （TEP） measurements show that the single crystals exhibit a p-type semiconducting nature. The direct and indirect band gap measurements are also undertaken on these semiconducting materials.

关键词： structural properties electrical properties optical properties single crystals

Phonon dynamics of glassy copper alloys

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中国化学前沿:英文版 2011年第1期6卷 54-68页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well recognized model potential is used to investigate the phonon properties for five glassy Copper alloys ***_(57)Zr_(43),Cu_(60)W_(40),Cu_(33)Y_(67),Cu_(43)Ti_(57) and Cu_(66)Ti_(34).The thermodynamic and elastic properties are also computed from the elastic limits of the phonon dispersion curves(PDC).Three theoretical approaches given by Hubbard-Beeby(HB),Takeno-Goda(TG)and Bhatia-Singh(BS)are used in the present study to compute the *** local field correction functions proposed by Hartree(H),Taylor(T),Ichimaru-Utsumi(IU),Farid et al.(F)and Sarkar et al.(S)are employed to see the effect of exchange and correlation in the aforesaid properties.

关键词： pseudopotential pair potential phonon dispersion curves(PDC) glassy copper alloys

Vibrational dynamics of Fe-based glassy alloys

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中国化学前沿:英文版 2011年第2期6卷 127-141页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well recognized model potential is used to investigate the vibrational properties of four Fe-based binary glassy alloys ***_(90)Zr_(10),Fe_(80)B_(20),Fe_(83)B_(17) and Fe_(80)P_(20).The thermodynamic and elastic properties are also computed from the elastic limits of the phonon dispersion curves(PDC).Three theoretical approaches given by Hubbard-Beeby(HB),Takeno-Goda(TG)and Bhatia-Singh(BS)are used in the present study to compute the *** local field correction functions proposed by Hartree(H),Taylor(T),Ichimaru-Utsumi(IU),Farid et al.(F)and Sarkar et al.(S)and Sarkar et al.’s local field factor(SLFF)based excgange and correlation function are employed to see the effect of exchange and correlation in the aforesaid properties.

关键词： pseudopotential pair potential phonon dispersion curves(PDC) Fe-based binary glassy alloys static properties vibrational properties

Vibrational dynamics of Ni-glassy alloys

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中国化学前沿:英文版 2011年第3期6卷 227-242页

作者： aditya m.vora Humanities and Social Science Department STBS College of Diploma EngineeringSurat 395006India

The well known model potential is used to investigate the vibrational properties of some Ni-based binary glassy alloys using three theoretical *** local field correction functions are employed to see the effect of exc... 详细信息

关键词： pseudopotential pair potential phonon dispersion curves(PDC) Ni-based amorphous binary alloys local field correction functions

Optimizing sampling frequency of surface and downhole measurements for efficient stick-slip vibration detection

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Petroleum 2024年第1期10卷 30-38页

作者： Saket Srivastava aditya Sharma Catalin Teodoriu mewbourne School of Petroleum and Geological Engineering The University of Oklahoma

Drilling vibrations significantly impact drilling operations with high costs due to early downhole equipment failure and loss of productive time. Stick-slip vibrations, a severe form of torsional vibrations,is known to be present up to 50% of total drilling time, making it a topic of immense concern and research. An ongoing discussion in the industry is regarding the reliability of surface measurements for early detection of severe downhole bit sticking. moreover, most surface measurements are sampled at lower frequency rates closer to 1 Hz. Recently, the implementation of advanced data acquisition modules in downhole subs has greatly improved our understanding of drilling vibrations through high resolution data, sampled up to 10 kHz. However, with a wide range of sampling frequency to choose from different available tools, a critical question remains unanswered. What is an optimal and adequate sampling frequency for early detection of downhole vibrations using both surface and downhole measurements?The paper addresses the question with a focus on stick-slip vibrations through an experimental investigation. Stick slip tests are repeated for different sampling frequencies of surface and downhole measurements and the stick slip index for each case is calculated. The stick-slip index varies for different sampling frequency even though the vibration tests remain completely identical. It was inferred that sampling frequency of measurements greatly impact the detection of downhole vibrations. Even though stick-slip vibrations are characteristically low frequency vibrations(≤2Hz), a minimum of 10Hz sampling frequency is recommended for detection of stick-slip vibrations. moreover, all characteristics of stick-slip vibrations including bit sticking, bit RPm peaks and negative bit RPms are clearly observed at a minimum of 100Hz sampling rate.

关键词： Stick-slip