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刘维尔方程是统计物理中基本方程,因而原则上统计物理中许多重要方程都可以由刘维尔方程导出,本文尝试由刘维尔方程推导玻尔兹曼方程. 相似文献
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本文应用线性代数、张量分析的基本概念说明拉氏方程、阿贝尔方程可以看作是牛顿方程在约束所允许的矢量空间中的协变分量形式,从而在不直接引用虚位移原理的前提下,导出这两个分析力学的基本方程. 相似文献
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从Schroedinger方程出发,结合自旋的唯象描述、简单的相对论考虑和适当的猜测,写出了Dirac方程的正确形式 相似文献
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拉普拉斯方程、 泊松方程、 热传导方程( 扩散方程)和波动方程是大学物理教学中常见的几个典型的微
分方程, 分别涉及到了流体力学、 电磁学、 热学和波动等重点教学内容. 探索了如何用直观明确而容易理解的物理
语言解读这些方程. 从拉普拉斯方程的物理本质出发, 通过改变该方程右端的形式, 分别引出泊松方程、 热传导方
程( 扩散方程)和波动方程, 详细阐述了上述方程与相关物理现象之间的内在联系, 提出了一种关于以上方程的纵
向对比讲授法, 为学生深入理解典型的数学物理微分方程的物理含义提供了可行的思路 相似文献
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本文叙述了有关昂氏气态方程(昂内斯气态方程的简称)的几点讨论。一是昂氏气态方程收缩为范式气态方程的讨论;二是昂氏气态方程温度昂T 和理想气态方程温度T理相等的压强(下面简称等温压强)的讨论;三是昂氏气态方程压强昂P 和理想气态方程压强P理相等的温度(下面简称等压温度)的讨论。 相似文献
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讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系,指出引力场强g并不是与r的平方成反比,这是由于银河系的大小和形状不能忽略造成的.强调了万有引力定律的适用条件. 相似文献
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J. Šlechta 《Czechoslovak Journal of Physics》1968,18(10):1299-1308
On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given. 相似文献
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The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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R. A. Vadov 《Acoustical Physics》2005,51(3):265-270
The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized. 相似文献
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We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments. 相似文献
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SJ Rose 《Contemporary Physics》2013,54(2):109-121
In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required. 相似文献
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Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage... 相似文献