6 citations · 11 across the 29 of their papers we have counts for
29 papers
Comments on "Total and fractional densities of states from caloric relations" by S. F. Chekmarev and S. V. Krivov, Phys. Rev. E 57 2445 (1998)
Ikhtier Holmamatovich Umirzakov
We showed that the equations (3), (4), (5) and (6), used in the paper Total and fractional densities of states from caloric relations by S. F. Chekmarev and S. V. Krivov, Phys. Rev…
Comments on "Mixed Bose-Fermi statistics Kinetic equation and navigation through network" by S.F. Chekmarev, Phys. Rev. E 82, 026106 (2010)
I. H. Umirzakov
The paper shows that the kinetic equations considered in [1], equilibrium distribution obtained in [1], and results and conclusions obtained on the basis of the kinetic equation de…
Classical Linear Harmonic Oscillators to Describe Thermodynamic Properties of Quantum Linear Harmonic Oscillators and Solids
Ikhtier Holmamatovich Umirzakov
As known all physical properties of solids are described well by the system of quantum linear harmonic oscillators. It is shown in the present paper that the system consisting of c…
Prediction of enthalpy for nitrogen gas revised
Ikhtier Umirzakov
It is shown that the energy spectrum of the pure vibrational levels of the molecule consisting of two atoms interacting with each other via the modified Rosen-Morse potential, the…
On Exact analytical calculations of thermodynamic functions of gaseous substances, R. Khordad, A. Avazpour, and A. Ghanbari, Chemical Physics 517 (2019) 30
Ikhtier Umirzakov
It is shown that that the exact solution of the Schrodinger equation for the molecule consisting of two atoms interacting via improved Tietz potential, the analytical expressions f…
Incorrectness of analytical solution of Schrodinger equation for diatomic molecule with shifted Tietz-Wei potential
Ikhtier Umirzakov
It is shown that: the analytical solution of the stationary Schrodinger equation for diatomic molecules with the shifted Tietz-Wei potential, which was reported in the paper Exact…
Comments on Partition function of improved Tietz oscillators, C.S. Jia et all, Chemical Physics Letters 676, 2017, 150
Ikhtier H. Umirzakov
The closed-form expression for the quantum partition function of the improved Tietz oscillator is obtained using the Voronoi summation formula.
Comments On the heat capacity of liquids at high temperatures, S.M. Stishov, Physica A 478 (2017) 205
Ikhtier Umirzakov
It is shown that the isochoric heat capacity of dense gas, fluid and liquid decreases with increasing temperature at arbitrary values of a density for many pair interaction potenti…
Van der Waals equation of state and PVT properties of real fluid
I. H. Umirzakov
It is shown that: in the case when two parameters of the Van der Waals equation of state are defined from the critical temperature and pressure the exact parametrical solution of t…
Comments on Model free temperature scaling for heat capacity (V.A. Drebushchak, Journal of Thermal Analysis and Calorimetry, 2017 130, 5)
I. H. Umirzakov
It is shown that the isobaric heat capacity of chalcogenides , , , and can be described by the Debye and Einstein models for the phonon frequency spectrum within their uncertaintie…
Comments on Van der Waals supercritical fluid: Exact formulas for special lines [J. Chem. Phys. 135, 084503 (2011)]
I. H. Umirzakov
The equations for Widom lines for the supercritical van der Waals fluid were considered in the paper J. Chem. Phys. 135, 084503 (2011). But the equations for the speed of sound and…
Comments on Failures of van der Waals Equation at the Gas Liquid Critical Point, L. V. Woodcock, International Journal of Thermophysics 2018 39 120
I. H. Umirzakov
These comments are a response to the discussion presented in the above paper concerning the New comment on Gibbs Density Surface of Fluid Argon, Revised Critical Parameters by Umir…
Comments on Generalization of thermodynamics in of fractional-order derivatives and calculation of heat transfer properties of noble gases, Journal of Thermal Analysis and Calorimetry 2018 133, 1189 1194
I. H. Umirzakov
It is shown that the equations for pressure, entropy and the isochoric heat capacity obtained by using generalization of the equilibrium thermodynamics in fractional derivatives in…
New Comment on Gibbs Density Surface of Fluid Argon: Revised Critical Parameters, L. V. Woodcock, Int. J. Thermophys. (2014) 35, 1770-1784
Ikhtier H. Umirzakov
It is shown that the existence of single critical point of the fluid described by van der Waals equation of state is not the hypothesis and it is the consequence of the thermodynam…
Comments on Negative Specific Heat in Astronomy, Physics and Chemistry
Ikhtier H. Umirzakov
It is shown that the proof of [1] that the specific heat of the system of classical point particles interacting with each other via uniform gravitational potential energy may be ne…
About paradox of negativity of specific heat of the system in thermostat
Ikhtier H. Umirzakov
It is shown that there is no proof of negativity of specific heat of the system placed in thermostat. It is proved that for the system of particles placed in the thermostat and int…
Critical exponents and amplitudes of analytical equation of state
Ikhtier H. Umirzakov
The paper analyzes a general case of an equation of state, which is an analytical function at the critical point of the liquid-vapor first order phase transition of pure substance.…
About oscillation method to study liquid viscosity
I H Umirzakov
It is shown that the oscillation method to study liquid viscosity of [1-3,7-34] is based on incorrect consideration of one dimensional forced (constrained) )vibrations of plate in…
About oscillation method to study crystallization and melting in multicomponent system
I H Umirzakov
It is shown that the oscillation method to study liquid viscosity of [1-3,7-34], which is the basis of oscillation method to study crystallization and melting in multicomponent sys…
Comments on Second caloric virial coefficients for real gases and combined spherical symmetric potential for simple molecular interactions
I. H. Umirzakov
It is shown that the interaction potentials for argon, krypton, xenon, carbon dioxide, ammonia, water, n-pentane, n-octane, 1-propanol, suggested in [1] cannot describe experimenta…
Comments on the behaviour of some thermodynamic characteristics of single component substance in the region defined by the line of liquid vapor equilibrium
I. H. Umirzakov
It is shown that in general case may be not correct the statements of [1,2,6-8] that 1) the isochoric heat capacity on the entire thermodynamic surface, including the metastable re…
Comments on "Thermic and Caloric Equations of State with Small Number of Parameters"
I. H. Umirzakov
It is shown that the potential of Keesom which depends on temperature cannot be used for calculate the second virial coefficient of polar molecules and the formulae for second viri…
About the Structure of a General Equation of State for Liquids and Gases
I. H. Umirzakov
It is shown that the functional form of the equation of state of [4-8] is not correct in general case.
Correlation of the critical parameters of the gas-liquid phase transition and the density of the crystal at zero absolute temperature
Ikhtier Umirzakov
The empirical formula of Timmermanns connecting the density of the crystal at zero absolute temperature with the parameters of the critical point of the gas-liquid phase transition…