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Effects of Transverse Field on internal energy and Specific Heat of a Molecular-Based Materials

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Communications in Theoretical Physics 2009年第11期52卷 965-968页

作者： JIANG Wei YU Gui-Hong ZHANG Fan WANG Wei JIANG Yuan School of Science Shenyang University of Technology Shenyang 110870 China

The molecular-based magnetic materials AFe11 Fe111（C2O4）3 have a honeycomb structure in which FeII （S = 2） and FeIH （S= 5/2） occupy sites alternately. They can be described as mixed spin-2 and spin-5/2 Ising model with ferrimagnetic interlayer coupling. The influences of the transverse field on the internal energy and the specific heat of the molecalar-based magnetic system have been studied numerically by using the effective-field theory with self-spin correlations and the differential operator technique.

关键词： transverse field molecular-based magnet internal energy specific heat

Deriving internal energy by Virtue of Generalized Feynman-Hellmann Theorem for Mixed States

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Communications in Theoretical Physics 2005年第6X期44卷 1041-1044页

作者： FAN Hong-Yi JIANG Zhong-Hua Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Special Class for Gifted Young University of Science and Technology of China Hefei 230026 China

We show how to directly use the generalized Feynman-Hellmann theorem, which is suitable for mixed state ensemble average, to derive the internal energy of Hamiltonian systems. A concrete example, which is a two couple... 详细信息

关键词： generalized Feynman-Hellmann theorem internal energy mixed state

internal energy and specific antiferromagnetic heat in a ferromagnetic- double layers

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Chinese Physics B 2007年第12期16卷 3832-3836页

作者：姜伟国安邦 College of Sciences Shenyang University of Technology Shenyang 110023 China

The internal energy and specific heat of a Heisenberg ferro- antiferromagnetic double-layer system are studied by using spin-wave theory and the retarded Green function method at low temperatures. Numerical results show that the antiferromagnetic intralayer coupling J2 has an important influence on internal energy and specific heat for a four-sublattice system with antiferromagnetic （or ferrimagnetic） interlayer couplings.

关键词： spin-wave theory ferromagnetic-antiferromagnetic double layers internal energy specific heat

The duality of internal energy of ideal gas

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Science Bulletin 2015年第15期60卷 1355-1358页

作者： Tian Zhao Zengyuan Guo Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua University

This contribution starts with the discussion on the classification of energy, and then the behaviors of various thermodynamic processes are analyzed, accompanying with the comparison of the adiabatic compression process of an ideal gas and an elastic rod. All these analyses show that the internal energy of ideal gases exhibits the duality of thermal energy–mechanical energy, that is,the internal energy acts as the thermal energy during the isochoric process, while the internal energy acts as the mechanical energy during the isentropic process. Such behavior of the internal energy is quite different from other types of energy during the energy conversion process because the internal energy of ideal gases exhibits the duality of thermal energy–mechanical energy. Because of this duality, the internal energy of ideal gas is proposed to be refered to as thermodynamic energy rather than thermal energy as indicated in some literature, although it consists of kinetics of the microscopic random motion of particles and can be expressed as the function of temperature only.

关键词： internal energy Mechanical energy Ideal gas Duality

Influence of Mass and Radius of Ice Crystals on Hydrometeors,internal energy,and Kinetic energy:A Numeric Model Study

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Atmospheric and Oceanic Science Letters 2014年第1期7卷 49-55页

作者： RAN Ling-Kun QI Yan-Bin LI Na Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences Jilin Weather Modification Office University of Chinese Academy of Sciences

Two cloud-scale experiments with two different ice-phase schemes were carried out for a precipitation event that occurred in eastern China in *** results were analyzed to examine the influences of the change of ice-particle mass and radius on hydrometeors,internal energy,and kinetic energy,as well as the primary factors *** was found that the ice content increases notably and the snow content decreases due to the *** is the consequence of the modulation of cloud microphysical *** particular,the Bergeron process and the accretion of snow and cloud ice are markedly *** differences of internal energy and kinetic energy between the two experiments are caused by adjustments to pressure-flux divergence,the coupling of temperature and divergence,and gravitational work,and the reason is that these three factors result in differences of local changes of internal and kinetic energy.

关键词： mass and radius of ice crystals cloud hydrometeors internal energy kinetic energy

Change in internal energy and Enthalpy of Spinning Black Hole with Half Spin Parameter in XRBs

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International Journal of Astronomy and Astrophysics 2016年第3期6卷 328-333页

作者： Dipo Mahto Amresh Kumar Singh Niharika Kumari Department of Physics Marwari College Bhagalpur T. M. B. University Bhagalpur India Department of Physics T. M. B. University Bhagalpur India

Mahto et al. gave an expression for the change in enthalpy and internal energy with corresponding change in the radius of the event horizon of black holes of spin parameter a* = 1 (2013). On the basis of this research work, we have proposed an expression for the change in the internal energy and enthalpy of the spinning black holes to assume spin parameter a* = 1/2 and calculated their values for different test spinning black holes existing in XRBs.

关键词： Enthalpy Spinning Black Holes internal energy

A Thermodynamic Model for square-well Chain Fluid:Theory and Monte Carlo Simulation

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Chemical Research in Chinese Universities 2001年第4期17卷 432-438页

作者： ZHANG Bing-jian LU Ying-hong HU Wen-xuan JIN Zhi-jun Department of Chemistry Zhejiang UniversityHangzhou 310027P.R.China Department of Earth Sciences Nanjing UniversityNanjing 210093P.R.China Basin and Reservoir Research Center China Petroleum UniversityBeijing 102200P.R.China

A thermodynamic model for the freely jointed square-well chain fluids was developed based on the thermodynamic perturbation theory of Barker-Henderson, Zhang and Wertheim. In this derivation Zhang’s expressions for square-well monomers improved from Barker-Henderson compressibility approximation were adopted as the reference fluid, and Wertheim’s polymerization method was used to obtain the free energy term due to the bond connectivity. An analytic expression for the Helmholtz free energy of the square-well chain fluids was obtained. The expression without adjustable parameters leads to the thermodynamic consistent predictions of the compressibility factors, residual internal energy and constant-volume heat capacity for dimer, 4-mer, 8-mer and 16-mer square-well fluids. The results are in good agreement with the Monte Carlo simulation. To obtain the MC data of residual internal energy and the constant-volume heat capacity needed, NVT MC simulations were performed for these square-well chain fluids.

关键词： Square-well chain Perturbation theory Compressibility factor internal energy

Kinetic Implication from Temperature Effect on Hydrogen Evolution Reaction at Ag Electrode

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Chinese Journal of Chemical Physics 2014年第1期27卷 63-68,I0003,I0004页

作者：康婧林楚红姚瑶陈艳霞中国科学技术大学合肥微尺度物质科学国家实验室(筹) 化学物理系合肥230026

Hydrogen evolution reaction （HER） at polycrystalline silver electrode in 0.1 mol/L HClO4 solution is investigated by cyclic voltammetry in the temperature range of 278-333 K. We found that at electrode potential φa,app decreases with φ, while pre-exponential factor A remains nearly unchanged,which conforms well the prediction from Butler-Volmer equation. In contrast, with φ nega-tive shifts from the onset potential for HER to the potential of zero charge （PZC≈-0.4 V）, both Ea,app and A for HER increase （e.g., Ea,app increases from 24 kJ/mol to 32 kJ/mol）. The increase in Ea,app and A with negative shift in φ from -0.25 V to PZC is explained by the increases of both internal energy change and entropy change from reactants to the transition states, which is correlated with the change in the hydrogen bond network during HER. The positive entropy effects overcompensate the adverse effect from the increase in the activation energy, which leads to a net increase in HER current with the activation energy negative shift from the onset potential of HER to PZC. It is pointed out that entropy change may contribute greatly to the kinetics for electrode reaction which involves the transfer of electron and proton, such as HER.

关键词： Hydrogen evolution reaction Ag electrode Temperature effect Activation energy Pre-exponential factor internal energy Entropy change

Magnetic properties of bilayer nano-stanenelike structure with Ruderman-Kittel-Kasuya-Yoshida coupling

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Communications in Theoretical Physics 2022年第6期74卷 168-178页

作者： Xin Su Nan Si Wei Jiang Wei-Chun Gao Feng-Ge Zhang School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China School of Electric Engineering Shenyang University of TechnologyShenyang 110870China

A bilayer nano-stanene-like structure with Ruderman-Kittel-Kasuya-Yoshida(RKKY)coupling described by the Ising model is proposed. The magnetic and thermodynamic properties are studied using the effective-field theory with correlations. The exchange coupling,longitudinal magnetic field, number of non-magnetic layers, and anisotropies had major influences on the magnetization, specific heat, and internal energy. Different saturation magnetizations are observed on the magnetization curve. The variation in the system blocking temperature is studied. The results provide theoretical guidance for the magnetic investigation of nanomaterials with RKKY coupling.

关键词： bilayer nano-stanene-like structure mixed spin Ising model magnetization internal energy