N. R. Mitra

Tilka Manjhi Bhagalpur University

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P. L. Srivastava

Banaras Hindu University

R. N. Singh

Sultan Qaboos University

Jitendra K. Thakur

National Institute of Plant Genome Research

B. B. Sahay

Tilka Manjhi Bhagalpur University

Narendra Kumar Mishra

SLAC National Accelerator Laboratory

Sangram Sinha

Tripura University

Doyel Pandey

Technical University of Darmstadt

I.S. Jha

Tribhuvan University

Abhijit Mitra

University of Calcutta

S. M. Rafique

National School of Political Science and Public Administration

Cooperative Institutions

Tilka Manjhi Bhagalpur University

Sultan Qaboos University

University of Delhi

Banaras Hindu University

Indian Institute of Technology Kanpur

National Institute of Plant Genome Research

International Centre for Genetic Engineering and Biotechnology

Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya

Rajiv Gandhi University of Health Sciences

TerraMetrics (United States)

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Thermodynamic properties of molten LiMg alloy

Physica B+C (1987)

R. N. Singh Doyel Pandey Sangram Sinha N. R. Mitra P. L. Srivastava

Short range order

10.1016/0378-4363(87)90105-7

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Citations (24)

Resistivity and thermoelectric power of liquid lithium and sodium from Harrison's first principle

physica status solidi (b) (1977)

N. R. Mitra Jitendra K. Thakur P. L. Srivastava

The nonlocal pseudopotential formalism of Harrison is applied to the problem of resistivity and thermoelectric power of liquid metals, lithium and sodium. Slater's recent value of α in the Xα-exchange is used. Exchange and correlation between the conduction electrons are taken into account using the modified dielectric function proposed by Vashishta and Singwi. The results agree well with the experimental values. Der nichtlokale Pseudopotentialformalismus von Harrison wird auf das Problem der Leitfähigkeit und Thermospannung in flüssigen Metallen, Lithirm und Natrium, angewendet. Der von Slater kürzlich angegebene Wert von α im Xα-Austausch wird benutzt. Austausch- und Korrelationseffekte zwischen den Leitungselektronen werden durch die modifizierte, von Vashishta und Singwi vorgeschlagene dielektrische Funktion berücksichtigt. Die Ergebnisse stimmen gut mit den experimentellen Werten überein.

Pseudopotential

Conduction electron

Formalism (music)

10.1002/pssb.2220840246

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Phonon frequency, electrical resistivity, and inter‐ionic pair potential of Li

physica status solidi (b) (1977)

R. N. Singh P. L. Srivastava N. R. Mitra

Abstract The effect of the form of model potential and different forms of exchange and correlation on the phonon frequency, liquid electrical resistivity, and inter‐ionic pair potential is investigated. The metallic properties are found to be sensibly affected with the choice of the form of the model potential. It is concluded that an r ‐dependent form of the model potential in the inner region of the ion may be important for a good reproduction of the metallic properties.

10.1002/pssb.2220830234

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Citations (12)

Ion Kinetics in the Lower Ionosphere

IETE Journal of Research (1966)

Abhijit Mitra N. R. Mitra

A comprehensive re-examination is made of the ion kinetics of the lower ionosphere in the light of recent space measurements of solar XUV radiation, ion composition and electron density profiles, and laboratory measurements of rate constants. The ionic chemistries of the ions NO+, O+2, N+2 and O+ are discussed. An approach in terms of the individual ionic chemistries and the recognition of NO+ abundance below 80 km., introduce some fundamental changes in the equations governing lower ionospheric ionization. Laboratory coefficients are found to be generally consistent with the data excepting for the process N+2 + O2 → O+2 + N2. For the process O+2 + N2 → NO+ + NO, for which laboratory observations give only an upper limit, a value of 1 × 10−18 cm.3/s. is inferred. A value of 3×10−8 cm.3/s. is obtained for the dissociative recombination coefficient of NO+.

Dissociative recombination

10.1080/03772063.1966.11485299

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Temperature Dependence of Electrical Resistivity of Zn, Cd, Hg, Al, In, Tl, and pb by Nonlocal Harmonic Model Potential

physica status solidi (b) (1981)

B. B. Sahay P. L. Srivastava N. R. Mitra

Abstract The harmonic model potential is used in its nonlocal form to study the temperature variation of the electrical resistivity of liquid Zn, Cd, Hg, Al, In, Tl, and Pb. The variation of the electrical resistivity with temperature is well demonstrated by the model and the numerical values are consistent with the experimental measurements in all the cases, except Hg.

Harmonic

10.1002/pssb.2221050109

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Citations (2)

Phonon spectrum of lithium

Journal of Physics F Metal Physics (1973)

P. L. Srivastava N. R. Mitra Narendra Kumar Mishra

The phonon spectrum of lithium has been computed by Shaw's optimized model potential method in the local and nonlocal approximations using the Shaw, Singwi et al and q-independent exchange and correlation factors. It has been found that the nonlocal form of the potential gives better results than the local form.

10.1088/0305-4608/3/7/014

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On choosing a set of eigenvalues and wave functions in harrison's first principle method

physica status solidi (b) (1983)

S. M. Rafique N. R. Mitra P. L. Srivastava

10.1002/pssb.2221190243

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Citations (4)

Phonon frequencies of caesium and metallic hydrogen

Physics Letters A (1976)

P. L. Srivastava N. R. Mitra R. N. Singh Narendra Kumar Mishra

Caesium

Wave vector

10.1016/0375-9601(76)90303-0

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Citations (6)

Electrical Resistivity of Polyvalent Liquid Metals by Harmonic Model Potential

physica status solidi (b) (1980)

B. B. Sahay P. L. Srivastava N. R. Mitra

Abstract A parabolic form of potential in place of a constant potential (Heine‐Abarenkov type) inside the ion core region is considered. The form has the advantage of reducing the difference between the potential gradients at the model radius. Its effect on electrical resistivity of liquid Zn, Cd, Hg, In, Tl, and Pb is investigated. The results show positive influence in all cases except Hg.

Potential difference

Constant (computer programming)

Harmonic

10.1002/pssb.2220970232

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Citations (6)

Stability of HgNa and HgK liquid alloys

Philosophical Magazine B (1990)

I.S. Jha R. N. Singh P. L. Srivastava N. R. Mitra

Abstract The alloying behaviour of HgNa and HgK liquid alloys has been investigated by assuming that the chemical complexes Hg2Na and Hg2K exist near the melting point on the molten amalgams. This has been used to obtain the concentration dependence of the free energy of mixing, activity, long-wavelength fluctuations and the volume of mixing. The results reveal that HgNa liquid alloys are more stable than HgK at all concentrations. There is every likelihood of the existence of Hg2Na and Hg2K complexes in the liquid alloys.

10.1080/13642819008208649

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Citations (38)