回热损失对磁斯特林制冷循环制冷率的影响

从铁磁质的磁化强度一般表示式出发，探讨热阻和回热损失对磁斯特林制冷循环性能的影响，导出最大制冷率及其它性能参数。得到了结果适用于以顺磁质为工质的磁斯特林制冷循环。并指出在理想回热条件下的结论也适用于磁卡诺制冷循环。     

用混合铁磁工质改善磁埃里克森制冷循环的回热性能

根据磁性材料的比热和熵的特性，讨论了采用混合铁巴工质可使磁埃里克森制冷循环实现理想回热或趋近于理想回热，而用混合顺磁工质则难达此目的．实验上也得到了相同的结论．     

二热源制冷循环理想回热的判据

提供了一个判断二热源循环是否具备理想回热条件的普遍判据，并用它讨论两类重要二热源循环的理想回热问题。强调了研究回热时应深入分析热量的质，同时还指出一些文献中有关理想回热断的错误。     

磁埃里克森制冷机的Yong经济优化性能

研究存在热阻和非理想回热的磁埃里克森制冷机的Yong经济优化性能，得到一些新的性能参数，并揭示了它与生态学优化性能间的联系，所得结论可为磁埃里克森制冷机研制和优化设计提供新的理论指导。     

顺磁质Ericsson制冷循环的优化分析

应用有限时间热力学理论研究了顺磁质Ｅｒｉｃｓｓｏｎ制冷循环的优化，得出了最佳制冷率和制冷系数之间的基本优化关系，取得了一些有意义的结果。对这类实际制冷机优化设计具有指导意义。     

多种不可逆性对磁埃里克森制冷循环性能的影响

建立以顺磁盐为工质的不可逆埃里克森制冷循环新模型,探讨热阻、热漏、回热损失及工质内部不可逆性等对循环性能的影响,分析和讨论制冷循环的重要性能参数及优化工作区域,所得结论比现有文献的相关结论更普遍,可为磁制冷机的优化设计和性能评价提供新理论参考.     

吸附式制冷循环的yong分析

以吸附式制冷循环的热力过程为依据，使用yong分析的方法对连续回热循环做了分析，对循环中各部分yong损进行了比较，指出了连续回热循环中yong损的主要部位，并探讨了回热率及吸附床的传热性能对循环yong效率的影响。     

磁制冷发展现状及趋势：Ⅱ磁制冷技术

简要介绍了磁制冷实现的原理,概括了磁制冷与气体压缩制冷的差异,比较了4种磁制冷循环的优缺点及适用场合,重点评述了室温温区磁制冷样机的研究进展,分析了磁制冷的关键技术,最后给出了磁制冷的潜在市场并展望了发展趋势。     

可逆脉管制冷循环与斯特林制冷循环的比较

建立了可逆脉管制冷机的等温－绝热模型，着重考虑脉管中过程对制冷机性能的影响，并与斯特林制冷机等温模型的计算机结果进行比较。结果表明，在理想工况下，可逆脉管制冷机的效率约为斯特林制冷机的８５％，制冷量约为７２％。可逆脉管制冷机配气活塞的最佳运动相位与斯特林制冷机基本相同。     

斯特林制冷机的制冷率与制冷系数的关系

在文献〔１〕的基础上，考虑了回热过程中的不可逆因素。并由此导出了既考虑等温换热过程中的不可逆因素，又考虑等容回热过程中的不可逆因素，同时还考虑循环运动情况下的斯特林制冷机的制冷率与制冷系数间的关系。     

平坦快衰落条件下天线数较多时空时格码的设计

空时格码技术是近年来无线通信领域的一个研究热点，空时格码的设计准则问题一直是该技术的一个难点。在平坦快衰落条件下且天线数目较多时，基于最小平方欧式距离最大化的空时格码设计准则虽然优于经典的距离－积准则，但仍不完善。从平方距离分布与平方距离和方－方和比分布的角度对此进行了改进，得到改进的准则以及性能为目前最优的新码。还对快慢2种衰落条件下码性能差异的原因给出了新的解释，并将改进的码设计准则应用于智贪码的设计。     

面向运动估计器硬件实现的加权块匹配检测算法

在各种视频处理算法中，运动补偿型算法大大提高了各种视频处理效果。运动估计器的硬件实现是各种运动补偿视频处理算法在实际系统中运用的关键。由于块匹配运动估计算法较低的运算复杂度和硬件实现难度以及块匹配检测标准函数很高的调用频率，已经广泛应用到各种实际系统中。文中提出了加权最小最大误差的匹配检测标准，能够降低运动估计器的运算复杂度，减少估计器的硬件面积，提高硬件速度，而且能够降低递归搜索块匹配运动估计算法固有误差传递带来的负面影响。     

Effect of plastic anisotropy of weld on limit load of undermatched middle cracked tension specimens

Plastic anisotropy may have a significant effect on the limit load of structures. The present paper shows its effect on the limit load of well‐undermatched middle cracked tension specimens assuming that the base material is elastic and the weld material obeys Hill's quadratic orthotropic yield criterion in rigid‐perfect plasticity. The solution is based on a kinematically admissible velocity field, which is compatible with a stress field satisfying the equilibrium equations and the yield criterion in the plastic zone. The velocity field is singular in the vicinity of the bi‐material interface, which is typical for isotropic materials.     

On reliability of molecular statics simulations of plasticity in crystals

A perfect 3D BCC crystal is subjected to tensile deformation, using a molecular statics approach, in order to investigate the reliability of the plastic part of the stress–strain data. The uniqueness of the stress–strain data serves as a criterion for the assessment of simulation reliability. Three magnitudes of displacement increments are considered for this purpose. For each magnitude the convergence criterion of relaxation to a minimum energy state is set the same. It is shown that the magnitude of the displacement increment does affect the stress–strain data and, for a given convergence criterion, there is a minimum magnitude below which the plastic part of the stress–strain data does not change. The related issue of dislocation formation at different displacement increments is also addressed.     

结构冲击屈曲准则讨论

结构冲击屈曲准则是进行结构冲击屈曲分析的基础。然而正是这个基础存在着许多问题，使得完善的结构冲击屈曲理论未能建立起来。本文全面地介绍了诸多学者提出的冲击屈曲准则，讨论了主要存在的问题和适用范围。针对完善结构线弹性冲击屈曲问题的分析，本文提出了瞬时线性分叉准则     

Self-referenced spectral interferometry cross-checked with SPIDER on sub-15 fs pulses

We characterized 11.7 fs nearly perfect Fourier Transform pulses with self-referenced spectral interferometry (SRSI), a new recently demonstrated technique. These pulses were first precisely optimized with three feedback loops between the SRSI setup and an AOPDF. An inherent control criterion to confirm that the measurement quality is theoretically derived and experimentally demonstrated. Each experimental result was cross-checked with SPIDER.     

Effect of nonuniform discharge on the efficiency of heat exchangers

A criterion of nonuniformity is proposed for the analysis of heat exchangers in which one of the heat carriers is nonuniformly distributed. Generalized quantitative relations are derived which make it possible to estimate the decrease of the regeneration factor. The basic results are verified by an experimental study.Translated from Inzhenerno Fizicheskii Zhurnal, Vol. 18, No. 4, pp. 678–687, April, 1970.     

爆破地震动研究现状

分析总结了爆破地震效应的地震动研究成果,给出了岩土中爆破地震动波传播的规律和分析模型,同时指出了在爆破地震动研究中存在的问题。     

On the temperature distribution in the counter flow heat exchanger with multicomponent non-azeotropic mixtures

The influence of mixture composition on the temperature distribution in the counter flow heat exchanger used in mixture Joule–Thomson refrigerators is investigated in this paper. A perfect heat capacity matching between the supply and the return streams can be achieved by optimizing the mixture composition. The deeper reason is that in two-phase state the latent heat makes a very important contribution in the overall heat capacity for multicomponent non-azeotropic mixtures. The theoretical results are compared with experimental data; both theoretical and experimental results agree well with each other. The results show that the temperature profile as well as the locations of the pinch points is determined by the mixture compositions. Therefore, it is possible to get a perfect temperature distribution using optimal mixture. This becomes another criterion of the optimization of mixture composition.