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理想气体任意过程最高和最低温度的计算方法 总被引:6,自引:2,他引:4
给出理想气体任意过程最高和最低温度的三种计算方法,用p-V图中的直线过程、圆过程、椭圆过程为例,计算该过程最高、最低温度的状态。 相似文献
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利用飞秒时间分辨荧光亏蚀光谱技术,研究了噁嗪750激光染料分子在典型的醇类溶剂中超快动力学过程.实验发现两个超快动力学过程:飞秒量级的快速弛豫过程和皮秒量级的慢速弛豫过程.快速弛豫过程来源于分子内振动能量再分配(IVR)和溶剂分子超快惯性弛豫动力学过程,而慢速弛豫过程对应于溶剂化的扩散分子弛豫动力学过程.实验结果表明慢速弛豫过程的时间常数随醇溶剂分子间氢键键能的增强而增大. 相似文献
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一、前言 在热力学过程的分析中,如果已知系统的过程图线或过程方程,如何判别任一元过程中吸热还是放热?这是一个有意义的问题.尤其是在循环过程效率η的计算问题中,由于决定η值的Q1和Q2分别是过程中单纯吸热部分和单纯放热部分的算术和而非一段过程中吸热放热的代数和,因而如何正确地判别各段过程中吸热、放热的问题就成为计算热机效率问题的关键. 最近几年来,本刊收到论述理想气体在任意准静态过程(本文论及的过程均属准静态过程)中吸热、放热问题的文章或来信共21篇(已发表两篇).来稿中有的是从不同角度采用不同方法提出判别法则,有的… 相似文献
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多光子过程和自发辐射对激光诱导自电离的影响 总被引:1,自引:1,他引:0
利用反作用算符的方法,研究了一个单模激光场将原子从束缚能级激发到自电离能级的过程中,双光子过程和自发辐射过程的影响。研究结果表明:自发辐射对这种光电离过程的影响一般情况下是很小的,但光子能谱特性十分明确地表明,辐射主要来源于由态共振加强的喇曼过程;并显示了激光诱导自电离过程中的缀饰(Dressed)原子图像;双光子过程将使光电子能谱和光诱导自电离过程变得非常复杂,单光子和双光子过程所产生的光电子能谱,都具有多极大值结构。 相似文献
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A direct approach has been developed for soliton perturbations based on the Green's function. We first linearized the soliton equation, and then derived the Green's function corresponding to approximation equations of different orders. Finally, we obtained the effects of perturbation on a soliton, namely both the slow time dependence of the soliton parameters and the corrections up to the second-order approximation. The higher-order effects can also be obtained in the same way. 相似文献
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A theory is presented to investigate the existence and propagation stability of gap solitons in a parity-time (PT) com- plex superlattice with dual periods. In this superlattice, the real and imaginary parts are both in the form of superlattices with dual periods. In the self-focusing nonlinearity, PT solitons can exist in the semi-infinite gap. However, only those gap solitons with low powers can propagate stably, whereas the high-power solitons present periodic oscillation and simultane- ously suffer energy decay. In the self-defocusing nonlinearity, PT solitons only exist in the first gap and all these solitons are stable. 相似文献
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Interaction of in-band and in-gap lattice soliton trains in optically induced two-dimensional photonic lattices
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We demonstrate the coherent interactions of lattice
soliton trains, including in-band solitons (IBSs) and gap soliton
trains (GSTs), in optically induced two-dimensional photonic
lattices with self-defocusing nonlinearity. It is revealed that the
$\pi$-staggered phase structures of the lattice soliton trains will
lead to anomalous interactions. Solely by changing their initial
separations, the transition between attractive and repulsive
interaction forces or reversion of the energy transfer can be
obtained. The `negative refraction' effect of the soliton trains
on the interaction is also discussed. Moreover, two interacting IBSs
can merge into one GST when attraction or energy transfer
happens. 相似文献
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Soliton Transmission Research on using Dispersion Step Fiber Chain Instead of Soliton Fiber 总被引:1,自引:0,他引:1
YU Jianjun YANG Bojun GUAN KejianYANG Qimin ZHANG Xiaoguan 《Chinese Journal of Lasers》1997,6(3):262-268
SolitonTransmisionResearchonusingDispersionStepFiberChainInsteadofSolitonFiberYUJianjunYANGBojun+GUANKejianYANGQiminZHANGXia... 相似文献
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以变系数的非自治非线性薛定谔方程为模型,考虑了一种色散、非线性和自发拉曼散射效应管理下的非自治系统,通过简单变换显式给出了该系统的精确非自治拉曼多色孤子解。基于精确孤子解,解析研究了该拉曼多色孤子在非自治管理系统中的演化特性,发现孤子的中心位置、波数与色散和非线性以及拉曼效应有关,而孤子频移仅与拉曼效应的参数决定,拉曼效应主导了非自治孤子的自频移,引起了孤子的频移在传输过程中不断的发生变化,导致了孤子的多色性。另外,我们数值讨论了该非自治孤子的传输稳定性,结果表明:该非自治拉曼多色孤子在有限的扰动下具有较好的稳定性。 相似文献