检索结果-南通市图书馆

Theoretical Prediction of Diamond Betavoltaic Batteries Performance Using ^(63)Ni

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2018年第7期35卷 24-28页

作者：刘玉敏陆景彬李潇祎许旭何瑞郑人洲尉国栋 college of physics Jilin University

A diamond p-n junction is used to convert the decay energy of 63Ni source into electrical energy. The selfabsorption effect of the 63Ni source, the backscatter process and the transport process of beta particles in diamond materials are studied. Then the theoretical maximum of electrical properties and the energy conversion efficiencies of diamond-63Ni p-n junction batteries are achieved. Finally, a feasible design of p＋p-n＋junction battery, which has the maximum output power density of 0.42 μW/cm2 and the optimal device conversion efficiency of 26.8%,is proposed.

关键词： Diamonds

Spontaneous emission of two interacting atoms near an interface

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第10期7卷 926-930页

作者：王德华 college of physics Ludong University

The spontaneous emission rate of two interacting excited atoms near a dielectric interface is studied using the photon closed-orbit theory and the dipole image method. The total emission rate of one atom during the emission process is calculated as a function of the distance between the atom and the interface. The results suggest that the spontaneous emission rate depends not only on the atomic-interface distances, but also on the orientation of the two atomic dipoles and the initial distance between the two atoms. The oscillation in the spontaneous emission rate is caused by the interference between the outgoing electromagnetic wave emitted from one atom and other waves arriving at this atom after traveling along various classical orbits. Each peak in the Fourier transformed spontaneous emission rate corresponds with one action of photon classical orbit.

关键词： Electromagnetic waves Orbits Photons Spontaneous emission

Teleportation of three-dimensional single particle state in noninertial frames

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第2期23卷 74-79页

作者：吴奇成文晶姬计新 Yeon Kyu-Hwang Department of physics College of ScienceYanbian University Department of physics College of Natural ScienceChungbuk National University

Considering the spin degree of freedom of the Dirac field, we study the entanglement behavior of a different class of communication channel and teleportation of three-dimensional single particle state in noninertial frames. Numerical analysis shows that the communication channel in our scheme can offer enough distillable entanglement for the teleportation protocol. Moreover, the teleportation protocol could work well if Rob＇s acceleration is not very big, but the fidelity of the teleportation is still reduced due to the Unruh effect.

关键词： three-dimensional entangled states noninertial frames teleportation Unruh effect

First-principles calculations of elasticity and thermodynamic properties of LaNi_5 crystal under pressure

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2009年第2期18卷 738-743页

作者：陈东陈敬东赵丽华王春雷余本海施德恒 college of physics and Electronic Engineering Xinyang Normal University college of physics and Information Engineering Henan Normal University

This paper investigates the equilibrium lattice parameters, heat capacity, thermal expansion coefficient, bulk modulus and its pressure derivative of LaNi5 crystal by using the first-principles plane-wave pseudopotential method in the GGA-PBE generalized gradient approximation as well as the quasi-harmonic Debye model. The dependences of bulk modulus on temperature and on pressure are investigated. For the first time it analyses the relationships between bulk modulus B and temperature T up to 1000 K, the relationship between bulk modulus B and pressure at different temperatures are worked out. The pressure dependences of heat capacity Cv and thermal expansion α at various temperatures are also analysed. Finally, the Debye temperatures of LaNi5 at different pressures are successfully obtained. The calculated results are in excellent agreement with the experimental data.

关键词： hydrogen storage Debye temperature thermodynamic properties LaNi5

Lattice Boltzmann simulation for the energy and entropy of excitable systems

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2011年第2期20卷 158-163页

作者：邓敏艺唐国宁孔令江刘慕仁 college of physics and Technology Guangxi Normal University college of physics and Electronic Engineering Guangxi Teachers Education University

The internal energy and the spatiotemporal entropy of excitable systems are investigated with the lattice Boltzmann method. The numerical results show that the breakup of spiral wave is attributed to the inadequate supply of energy, i.e., the internal energy of system is smaller than the energy of self-sustained spiral wave. It is observed that the average internal energy of a regular wave state reduces with its spatiotemporal entropy decreasing. Interestingly, although the energy difference between two regular wave states is very small, the different states can be distinguished obviously due to the large difference between their spatiotemporal entropies. In addition, when the unstable spiral wave converts into the spatiotemporal chaos, the internal energy of system decreases, while the spatiotemporal entropy increases, which behaves as the thermodynamic entropy in an isolated system.

关键词： lattice Boltzmann method energy entropy spiral wave

Phase control of spontaneous emission from a double-band photonic crystals

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2010年第5期19卷 306-312页

作者：张珂祝艳萍姜丽张汉壮 college of physics Jilin University Laboratory of Optical physics Institute of PhysicsChinese Academy of Sciences

Through the picture of dressed states, this paper investigates the spontaneous emission spectrum from a microwavedriven three-level atom embedded in double-band photonic crystals. The physical dynamics of the phase dependent phenomenon are analysed by comparing two models ＇upper level coupling＇ and ＇lower level coupling＇. When the phase is changed from 0 to π, the variety of spontaneous emission spectra from either of the two models are inverse to each other, in which the relative height and width of the peaks are determined by the density of states in photonic crystals.

关键词： photonic crystals spontaneous emission phase

Elastic collisions between Si and D atoms at low temperatures and accurate analytic potential energy function and molecular constants of the SiD(X^2Π) radical

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2009年第6期18卷 2250-2257页

作者：施德恒张金平孙金锋朱遵略 college of physics & Information Engineering Henan Normal University college of physics & Electronic Engineering Xinyang Normal University

Interaction potential of the SiD（χ^2П） radical is constructed by using the CCSD（T） theory in combination with the largest correlation-consistent quintuple basis set augmented with the diffuse functions in the wlence range. Using the interaction potential, the spectroscopic parameters are accurately determined. The present Do, De, Re, ωe, αe and Be values are of 3.0956 eV, 3.1863 eV, 0.15223 nm, 1472.894 cm^-1, 0.07799 cm^-1 and 3.8717 cm^-1, respectively, which are in excellent agreement with the measurements. A total of 26 vibrational states is predicted when J = 0 by solving the radial Schroedinger equation of nuclear motion. The complete vibrational levels, classical turning points, initial rotation and centrifugal distortion constants when J = 0 are reported for the first time, which are in good accord with the available experiments. The total and various partial-wave cross sections are calculated for the elastic collisions between Si and D atoms in their ground states at 1.0× 10^-11-1.0×10^-3 a.u. when the two atoms approach each other along the SiD（χ^2П） potential energy curve. Four shape resonances are found in the total elastic cross sections, and their resonant energies are of 1.73×10^-5, 4.0×10^-5, 6.45×10^-5 and 5.5×10^-4 a.u., respectively. Each shape resonance in the total elastic cross sections is carefully investigated. The results show that the shape of the total elastic cross sections is mainly dominated by the s partial wave at very low temperatures. Because of the weakness of the shape resonances coming from the higher partial waves, most of them are passed into oblivion by the strong s partial-wave elastic cross sections.

关键词： elastic collision total cross section shape resonance spectroscopic parameter

Accurate ab initio study of low-lying electronic states of phosphorus nitride radical

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2010年第11期19卷 340-346页

作者：王杰敏孙金锋施德恒 college of physics & Information Engineering Henan Normal University Department of physics & Electronic Information Luoyang Normal College

This paper employs the highly accurate valence internally contracted multireference configuration interaction method to investigate the potential energy curves （PECs） for the ground state （X^1 ∑^＋） and two low-lying excited states （A^1∏ and D^1 △ of phosphorus nitride （PN） radical with the correlation-consistent basis set, aug-cc-pV6Z, in the valence range. Relativistic effects are considered in these calculations. The spectroscopic constants of the X^1 ∑^＋ and A^1∏ states are calculated based on the PECs, and the results are in good accord with the available experimental data. The first 30 vibrational states for the X^1 ∑^＋ state and the first 40 vibrational states for the A^1∏ state are determined when J = 0. For each vibrational state, molecular constants G（v）, B（v） and D（v） are also attained.

关键词： PN radical potential energy curves spectroscopic constant molecular constants

Theoretical investigations of spectroscopic parameters and molecular constants for electronic ground state of Cl_2 and its isotopes

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2010年第10期19卷 236-244页

作者：施德恒张小妞刘慧朱遵略孙金锋 college of physics & Electronic Engineering Xinyang Normal University college of physics & Information Engineering Henan Normal University

The potential energy curve of the C12 （X1∑g＋） is investigated by the highly accurate valence internally contracted multireference configuration interaction （MRCI） approach in combination with the largest correlation-consistent basis set, aug-cc-pV6Z, in the valence range. The theoretical spectroscopic parameters and the molecular constants of three isotopes, 35Cl2, 35Cl37Cl and 37Cl2, are studied. For the 35Cl2（X1∑g＋）, the values of Do, De, Re, We, we）we, ae and Be are obtained to be 2.3921 eV, 2.4264 eV, 0.19939 nm, 555.13 cm-1, 2.6772 cm-1, 0.001481 cm-1 and 0.24225 cm-1, respectively. For the 356137Cl（X1∑g＋）, the values of Do, De, Re, We, WeXe, ae and Be are calculated to be 2.3918 eV, 2.4257 eV, 0.19939 nm, 547.68 cm-1, 2.6234 cm-1, 0.00140 cm^1 and 0.23572 cm-1, respectively. And for the 37Cl2（X1∑g＋）, the values of Do, De, Re, We, WeXe, ae and Be are obtained to be 2.3923 eV, 2.4257 eV, 0.19939 nm, 540.06 cm-1, 2.5556 cm-1, 0.00139 cm-1 and 0.22919 cm-1, respectively. These spectroscopic results are in good agreement with the available experimental data. With the potential of Cl2 molecule determined at the MRCI/aug-cc-pV6Z level of theory, the total of 59 vibrational states is predicted for each isotope when the rotational quantum number J equals zero （J = 0）. The theoretical vibrational levels, classical turning points, inertial rotation and centrifugal distortion constants are determined when J = 0, which are in excellent accordance with the available experimental findings.

关键词： isotope effect spectroscopic parameter molecular constant vibrational level