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Thermophysical properties of iridium at finite temperature

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Chinese Physics B 2016年第11期25卷 404-411页

作者： Priyank kumar n k bhatt P R Vyas V B Gohel Department of Science Government PolytechnicGandhinagar Department of Physics Sardar Patel University Department of Physics School of Science Gujarat University

The bulk properties of materials in an extreme environment such as high temperature and high pressure can be understood by studying anharmonic effects due to the vibration of lattice ions and thermally excited *** this spirit,in the present paper,anharmonic effects are studied by using the recently proposed mean-field potential（MFP） approach and Mermin functional which arise due to the vibration of lattice ions and thermally excited electrons,*** MFP experienced by a wanderer atom in the presence of surrounding atoms is constructed in terms of cold energy using the local form of the *** have calculated the temperature variation of several thermophysical properties in an extreme environment up to melting *** results of our calculations are in excellent agreement with the experimental findings as well as the theoretical results obtained by using first principle *** conclude that presently used conjunction scheme（MFP＋pseudo potential） is simple computationally,transparent physically,and accurate in the sense that the results generated are comparable and sometimes better than the results obtained by first principle *** pseudopotential used is transferable to extreme environment without adjusting its parameters.

关键词： extreme experienced melting presently excited thermally sometimes understood comparable conclude

High-temperature thermodynamics of silver:Semi-empirical approach

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Chinese Physics B 2017年第11期26卷 400-407页

作者： R H Joshi B Y Thakore P R Vyas A R Jani n k bhatt Department of Physics Sardar Patel University Department of Physics School of Sciences Gujarat University Sardar Patel Center for Science and Technology Department of Physics M.K.Bhavnagar University

We report high-temperature thermodynamics for fcc silver by combining ab initio phonon dynamics to empirical quadratic temperature-dependent term for anharmonic part of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects ambient condition free electron gas model to Thomas-Fermi *** present study shows good agreement with experimental and reported findings for several thermal properties, and the discrepancy observed in some caloric properties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal bulk modulus and in the constant volume anharmonic lattice specific heat at high temperature are the clear evidences of proper account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen parameter. We observe that the intrinsic phonon anharmonicity starts dominating above characteristic temperature, which is attributed to higher order anharmonicity and can be related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vibrations at high temperature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen parameter silver

Thermodynamic properties of 3C-SiC

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Chinese Physics B 2013年第10期22卷 429-435页

作者： B.Y.Thakore S.G.khambholja A.Y.Vahora n.k.bhatt A.R.Jani Department of Physics Sardar Patel UniversityVallabh Vidyanagar388120GujaratIndia Indus University Ahmedabad 380001GujaratIndia

In the present paper, we report on the results of various thermodynamic properties of 3C-SiC at high pressure and temperature using first principles calculations. We use the plane-wave pseudopotential density functional theory as im- plemented in Quantum ESPRESSO code for calculating various cohesive properties in ambient condition. Further, ionic motion at a finite temperature is taken into account using the quasiharmonic Debye model. The calculated thermody- namic properties, phonon dispersion curves, and phonon densities of states at different temperatures and structural phase transitions at high pressures are found to be in good agreement with experimental and other theoretical results.

关键词： phase transition phonon dispersion curve Debye model thermodynamic property

Pr(Ⅲ) and nd(Ⅲ) Absorption Spectroscopic Probe to Investigate Interaction with Lysozyme (HEW)

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Journal of Rare Earths 2006年第6期24卷 648-652页

作者： Jignasu P.Mehta Prashant n.bhatt Sudhindra n. Misra Department of Chemistry Bhavnagar UniversityBhavnagar-364002India

Pr（ Ⅲ ） and nd（ Ⅲ ） can be utilized as absorption spectroscopic probes to investigate the interaction of biomolecules like Lysozyme （HEW） with Ca（ Ⅱ ） in-vitro ; the most abundant metal ion in the human body system. The spectroscopic techniques involving comparative absorption, absorption difference, and quantitative intensity analysis using 4f-4f transitions are utilized for changes in the inner sphere coordination pattern of Pr（ Ⅲ ） and nd（Ⅲ ） in solution as well as in solid state. The present study deals with an important biomolecule in human metabolism, that is, Lysozyme （HEW）. The absorption er-Condon the probab spectral parameters such as the oscillator strength （P）, the Judd-Ofelt （Tλ） intensity parameters, and the Slatinter electronic parameters are calculated using chi square methods. The obtained results are used to determine le geometry of the complex in the solution, the nature of the bond between Pr（Ⅲ）/nd（Ⅲ） with lysozyme, and the inner sphere coordination environment of f-f transitions. The results obtained from various experimental conditions are utilized to investigate the coordination changes in the Pr（Ⅲ）/nd（Ⅲ） complexes caused by different coordinating sites of lysozyme, normalized bite, denticity, the solvent nature, the coordination number, the nature of bond and other parameters to mimic the interaction of the Ca（ Ⅱ ） ion with such biomolecule.

关键词： absorption spectra Pr(Ⅲ), nd(Ⅲ) Lysozyme (HEW) spectral parameters rare earths

Provenance discrimination and Source-to-Sink studies from a dryland fluvial regime:An example from kachchh,western India

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International Journal of Sediment Research 2014年第1期29卷 99-109页

作者： S.P.PRIZOMWALA nilesh bhatt n.BASAVAIAH Institute of Seismological Research Department of Geology The M.S.University of Baroda Indian Institute of Geomagnetism

Tracing the sediment delivery from its source terrain to its ultimate sink envisage multiple factors that play a vital role in understanding present day erosional *** accomplish this,it is significant to distinguish the variable end-members contributing to the *** findings from the study of dryland coastal fluvial regime in kachchh(Western India),which is one of the end members contributing to the Gulf of kachchh coast(partial sink) and finally to the Arabian Sea(ultimate sink) have been presented ***-proxy sediment provenance proxies such as grain-size,clay minerals,geochemistry and magnetic minerals have been employed to evaluate the provenance discriminating characteristics of the kachchh dryland fluvial system and factors influencing *** results of different proxies indicate that the provenance signatures of uplands are quite characteristic with magnetic susceptibility(χ) values of kg-1and smectite(S)/kaolinite(k) ratio between 0.26 and *** middle reaches show marked increase in magnetic mineral concentration with χ values(140×10-7m3kg-1)and S/k ratio(4.92),while the estuarine tract shows χ values(80×10-7m3kg-1),S/k ratio(1.90) and,characteristic heavy minerals(*** minerals),probably reflect the interplay between land and sea *** sources of sediments within catchment scale were identified,viz.,upland sedimentary rocks(Juran and Bhuj Formation sandstone-shale) and middle reaches volcanic(Deccan Trap Formation basalt) *** present study draw cautions in provenance of sediment discrimination in areas influenced by Deccan basalt that has the overwhelming sediment delivery and a comparatively subdued effects of other provenance *** studied proxies of mineralogy of clays,magnetic minerals and geochemistry of heavy and major elements serve as the potential for fingerprint of sediment source regions and hence behold a strong position in source to sink studies globally.

关键词： Provenance Source-to-sink Heavy minerals Clay minerals kachchh

Eu(Ⅲ) Indirect Probe to Investigate Interaction of DOPA (3,4,Di-Hydroxyphenylalanine) and Dopamine (3,4-Dihydroxy Phenyl Ethyl Amine) Using Electrochemical Methods

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Journal of Rare Earths 2006年第6期24卷 653-658页

作者： Prashant n bhatt Trupti V Pathak Jignasu P Mehta G.Ramchandraiha Department of Chemistry Bhavnagar University Bhavnagar-364002 India Central Salt and Marine Chemical Research Institute Waghavadi RoadBhavnagar-364002India

Eu（ Ⅲ ） can be utilized as an indirect electrochemical probe to investigate the interaction of bio-molecules such as DOPA and Dopamine with Ca（ Ⅱ ） in vitro. The interaction of DOPA and Dopamine with Eu（ Ⅲ ）-Eu（ Ⅱ ） redox pair was investigated by electrochemical techniques. Both the neurotransmitters are structurally related and undergo interaction with Eu （Ⅲ ）. Eu （ Ⅲ ） coordinates with DOPA and Dopamine through five-member chelate tings via carboxylic oxygen and amino nitrogen. The electrode kinetic parameters viz, transfer coefficient （αna）, diffusion coefficient （D）, forward heterogeneous rate constant （ k^0 fh） were evaluated for Eu（ Ⅲ ）-DOPA/Eu（ Ⅲ ）-Dopamine. The results obtained were used to investigate the nature of interaction of Eu （Ⅲ） with muhi-donor biomolecules. The possible mechanism was also proposed.

关键词： electrochemistry of Eu ( Ⅲ ) chrono techniques electrochemistry of Eu ( Ⅲ )-neurotransmitters solutionstudy rare earths

Carbon Disulphide Induced Sensitivity Changes of Rat Anococcygeus Muscle to noradrenaline(nA)

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Biomedical and Environmental Sciences 1993年第3期6卷 223-230页

作者： D.n.GAnDHI H.VEnkATAkRISHnA-bhatt Department Department of Neurobehavioural Toxicology National Institute of Occupational Health(ICMRMeghani NagarAhmedabad 380016Indiaof Neurobehavioural Toxicology National Institute of Occupational Health(ICMRMeghani NagarAhmedabad 380016India

The sensitivity of rat anococcygeus muscle to noradrenaline (nA) was reduced following carbon disulphide (CS2) pretreatment. Preparations incubated in excess Ca++ (4.2 mrnol-L-1) or Zero Ca++ (***-L-1) media showed decrease in sensitivity to nA. Reserpinization failed to induce supersensitivity to nA in any Mg+ + concentration in the media. Reserpinized tissue in Mg++ free media with EDTA showed increased sensitivity while decreased sensitivity and maximum response to nA in Mg+ + (1.2 mmol-L-1) and excess Mg+ + (3.6mmol-1 ') concentration of the medium. In the presence of EDTA, the inhibition observed with CS2 in excess Mg+ + (3.6m mol-L-1') medium was comparatively much less in both non-reserpinized and reserpinized preparations. In normal Ca++ and its deficient medium decrease in sensitivity to CS2 and the relevant maximum response to nA were observed. In excess Ca + +, the CS2 effect depressed corresponding to its maximal response to nA. Thus CS2 may be inhibiting responses to nA by interfering with Ca+ + utilization.

关键词：工业溶剂二硫化碳 CS2 大鼠肛尾肌肉去甲肾上腺素痉挛反应敏感性变化慢性毒性

Optimization of enzymatic hydrolysis of pigeon pea for cooking quality of dhal

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International Journal of Agricultural and Biological Engineering 2014年第5期7卷 123-132页

作者： V.P.Sangani n.C.Patel V.M.bhatt P.R.Davara D.k.Antala Department of Processing and Food Engineering College of Agricultural Engineering and TechnologyJunagadh Agricultural UniversityJunagadhGujaratIndia Anand Agricultural University AnandGujaratIndia

Cooking quality of dehusked splits is influenced by the dehulling method,in particular,by the pre-milling *** effects of four enzymatic hydrolysis parameters,i.e.,enzyme concentration(20-60 mg/100 g dry matter),incubation time(3-15 h),incubation temperature(40-60℃)and tempering water pH(4.0-6.0)on cooking time of pigeon pea dhal were optimized using response surface *** kinds of enzymes,i.e.,xylanase,pectinase,and cellulas were used in combination for enzymatic pre-treatment.A quadratic model satisfactorily described the dehulling efficiency with high value for the coefficient of determination R^(2)(0.9062).It predicted a minimum cooking time of 21.91 min at enzyme concentration of 37.8 mg/100 g dry matter,incubation time 8.69 min,incubation temperature 48.5℃ and pH 5.49 of tempering *** time at optimum condition was observed to be 21.50 min and the predicted values of cooking time showed 2.19% deviation from the experimental *** of the study revealed that cooking time of enzyme treated dhal could be decreased by 19.77% compared to the oil treated dhal.

关键词： pigeon pea enzymatic hydrolysis cooking quality enzymatic pre-treatment dehulling response surface methodology

Inter-population variabilities in seed mass and germination of Panicum turgidum and Pennisetum divisum in the desert of kuwait

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Journal of Arid Land 2020年第1期12卷 144-153页

作者： Arvind bhatt narayana R BHAT Afaf AL-nASSER María M CARÓn AndreaSAnTO kuwait Institute for Scientific Research Safat 24885Kuwait Laboratory of Botanical Research(LABIBO) Faculty of Natural SciencesNational University of Salta-CONICETSalta 4400Argentina Independent Researcher Selargius 09047Italy

Understanding variability in seed germination among populations is essential for planning an effective germplasm collection for restoration and conservation *** knowledge of germination and dormancy patterns among populations of desert grasses is crucial for determining the potential of the species and populations to be used for restoration and conservation as well as forage *** in seed germination of Panicum turgidum Forssk and Pennisetum divisum(Gmel.)*** the desert of kuwait was evaluated in different populations in May *** of seed germination(25 seeds and 4 replicates)was conducted for each population at night/day temperatures of 15℃/20℃and 20℃/30℃under the following light condition:continuous darkness or 12 h/12 h light/*** showed that seed masses of both species strongly varied according to their seed provenances,and both species produced heavier seeds in population with a higher soil electrical *** germination percentage considerably varied between two species,and the variation in *** was greater(17%–49%)than that of ***(72%–93%).Germination percentage in *** was greater at high temperature(20℃/30℃)than at low temperature(15℃/20℃).However,temperature regimes had no effect on germination percentage of *** *** germination time of both species exhibited significant inter-population *** result is especially relevant to assure the selection of the best population of each species and the regeneration success of the *** this,inter-population variability also provides valuable information for enhancing our understanding of the mechanisms that regulate seed germination and how they might be related to seed provenance.

关键词： desert grass seed germination inter-population variability seed provenance seed dormancy