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31.
A.N. Behkami M. Gholami M. Kildir M. Soltani 《理论物理通讯》2006,46(3):514-520
The statistical properties of interacting fermions have been studied for various angular momentum with the inclusion of pairing interaction. The dependence of the critical temperature on angular momentum for several nuclei, have been studied. The yrast energy as a function of angular momentum for 28Si and 24 Mg nuclei have been calculated up to 60.0 MeV of excitation energy. The computed limiting angular momenta are compared with the experimental results for ^26Al produced by ^12C+ 14N reaction. The relevant nuclear level densities for non-zero angular momentum have been computed for ^44Ti and ^136 Ba nuclei. The results are compared with their corresponding values obtained from the approximate formulas. 相似文献
32.
Influence of Solvent-Solvent and Solute-Solvent Interaction Properties on Solvent-Mediated Potential
ZHOU Shi-Qi 《理论物理通讯》2005,44(2):365-370
A recently proposed universal calculational recipe for solvent-mediated potential is applied to calculate excess potential of mean force between two large Lennard-Jones (LJ) or hard core attractive Yukawa particles immersed in small LJ solvent bath at supercritical state. Comparison between the present prediction with a hypernetted chain approximation adopted for solute-solute correlation at infinitely dilute limit and existing simulation data shows high accuracy for the region with large separation, and qualitative reliability for the solute particle contact region. The calculational simplicity of the present recipe allows for a detailed investigation on the effect of the solute-solvent and solvent-solvent interaction details on the excess potential of mean force. The resultant conclusion is that gathering of solvent particles near a solute particle leads to repulsive excess PMF, while depletion of solvent particles away from the solute particle leads to attractive excess PMF, and minor change of the solvent-solvent interaction range has large influence on the excess PMF. 相似文献
33.
利用有限尺寸标度分析方法,研究了考虑次近邻相互作用的正方点阵完全阻挫XY模型的Ising型相变现象.结果表明对于次近邻耦合系数x=0.5的情况,系统存在Ising型相变,临界温度Tc=0.4043±0.0005,临界指数ν=0.80±0.05. 相似文献
34.
A Method for Determining the Phase Transition Point of the Bose-Einstein Condensation by Judging the Fitting Errors 下载免费PDF全文
In this paper, We demonstrate an approach to determine the phase transition point and critical temperature of Bose-Einstein condensation. During the fitting sequence of time-of-flight images, for just one picture we take four kinds of different calculations instead of only one. By calculating the quantitative least-square errors, which have always been neglected before, we find out that this value can act as a criterion to judge the status of atom clouds. Using this criterion, we can not only discriminate the status around the phase transition point, but can also find the critical point precisely. Also with this method, we can achieve the totally automatical running of calculating programs without human's judgments. 相似文献
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36.
Alireza Bahadori Saeid Mokhatab Brian F. Towlera 《天然气化学杂志》2007,16(4):349-353
Natural gases containing sour components exhibit different gas compressibility factor(Z) behavior than do sweet gases.Therefore,a new accurate method should be developed to account for these differences.Several methods are available today for calculating the Z-factor from an cquation of state. However,these equations are more complex than the foregoing correlations,involving a large number of parameters,which require more complicated and longer computations.The aim of this study is to develop a simplified calculation method for a rapid estimating Z-factor for sour natural gases containing as much as 90% total acid gas.In this article,two new correlations are first presented for calculating the pseudo- critical pressure and temperature of the gas mixture as a function of the gas specific gravity.Then,a simple correlation on the basis of the standard gas compressibility factor chart is introduced for a quick estimation of sweet gases' compressibility factor as a function of reduced pressure and temperature.Finally,a new corrective term related to the mole fractions of carbon dioxide and hydrogen sulfide is developed. 相似文献
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38.
普遍色散关系下的热波长 总被引:1,自引:0,他引:1
指出目前教科书和文献所用的热波长概念仅适用于非相对论性系统,而本文引进了普遍热波长的概念。由此可使理想量子气体的热力学函数表示成统一的简洁形式,并进一步揭示了热波长的物理内涵。另外还导出玻色-爱因斯坦凝聚温度和费米温度间的普遍关系。 相似文献
39.
A new combination Monte Carlo (MC) technique of the classical Metropolis algorithm and the Swendsen Wang cluster algorithm is proposed. Upon application of the MC technique, the thermodynamic properties of a generalized two-dimensional XY model with chiral Dzyaloshinski-Moriya (DM) interactions are simulated for various DM interactions. The specific heat, order parameter and the integrated correlation time are simulated, We find that there exists a high-temperature Kosterlitz-Thouless-type phase transition related to strong DM spin ehiralities. As the DM strength increases the critical temperature of the Kosterlitz-Thouless phase transition increases, It is shown that the combination algorithm is faster than the Metropolis algorithms. 相似文献
40.
1,3,3-三硝基氮杂环丁烷的热安全性 总被引:3,自引:0,他引:3
借助不同加热速率(β)的非等温DSC曲线离开基线的初始温度(T0)、onset温度(Te)和峰顶温度(Tp), Kissinger法和Ozawa法求得的热分解反应的表观活化能(Ek和EO)和指前因子(Ak), Hu-Zhao-Gao方程ln βi=ln[A0/(be0 or p0G(α))]+ be0 or p0Tei or pi求得的be0 or p0, Zhao-Hu-Gao方程ln βi=ln[A0/((ae0 or p0+1)G(α))]+(ae0 or p0+1) ln Tei or pi求得的ae0 or p0, 微热量法确定的比热容(Cp), 以及密度(ρ)、热导率(λ)和分解热(Qd, 取爆热之半)数据, Zhang-Hu-Xie-Li公式、Hu-Yang-Liang-Xie公式、Hu-Zhao-Gao公式、Zhao-Hu-Gao公式、Smith方程、Friedman公式和Bruckman-Guillet公式, 计算了TNAZ在β→0时的T0, Te和Tp值(T00, Teo和Tp0)、热爆炸临界温度(Tbe和Tbp)、绝热至爆时间(tTlad)、撞击感度50%落高(H50)和热点起爆临界温度(Tcr), 得到了评价TNAZ热安全性的结果: TSADT=Te0=485.81 K, Tp0=497.38 K, Tbeo=499.50 K, Tbp0=513.45 K, tTlad=8.90 s (n=0), tTlad=8.96 s (n=1), tTlad=9.01 s (n=2), H50=28.88 cm, Tcr=641.46 K (Troom=293.15 K), Tcr=658.89 K (Troom=300 K), 表明: (1) TNAZ对热是稳定的; (2)撞击感度好于环三亚甲基三硝胺(RDX); (3)热点起爆临界温度高于RDX, 而界于1,3,5-三氨基-2,4,6-三硝基苯(TATB)和六硝基茋(HNS)之间. 相似文献