遗传算法在碳纤维复合材料高速转子优化设计中的应用

对多层结构碳纤维复合材料转子进行了高转速下的静力学分析 ,建立了多层嵌套结构碳纤维复合材料转子的强度与转子的材料密度、转速、纤维铺设角、各层径向壁厚以及各层间过盈配合量间的数学关系式。应用遗传算法进行了转子结构的优化设计 ,解决了多层结构碳纤维复合材料高速转子设计中如何寻求转子最优外形和工艺参数的难题。通过对转子各层的纤维铺设角、各层径向壁厚以及各层间过盈配合量进行优化 ,获得了转子的最佳几何外形和工艺参数 ,使转子的储能密度较优化设计前提高了 1 36 % ,最大限度地提高了转子的储能能力。此优化设计方法为多层嵌套结构碳纤维复合材料转子的储能密度优化设计提供了有效手段     

The Questions On Jun Zhu′s Paper: A Model of the Age Patterns of Births by Parity in Natural Fertility Populations

１　ＴｈｅＭｏｄｅｌｓｉｎｔｈｅＰａｐｅｒ（ＪｕｎＺｈｕ，１９９４）Ａｗｏｍｅｎｃｈｉｌｄｂｅａｒｉｎｇｐｒｏｃｅｓｓｗａｓｄｅｓｃｒｉｂｅｄａｓａｓｅｑｕｅｎｔｉａｌｐｒｏｃｅｓｓｃｏｎｓｉｓｔｉｎｇｏｆａｓｅｒｉｅｓｏｆｉｎｄｅｐｅｎｄｅｎｔｓｔａｇｅｓｗｈｅｒｅｗｏｍｅｎｍｏｖｅｆｒｏｍｍａｒｒｉａｇｅｔｏｆｉｒｓｔｂｉｒｔｈ，ｆｒｏｍｆｉｒｓｔｂｉｒｔｈｔｏｓｅｃｏｎｄｂｉｒｔｈ，ａｎｄｓｏｏｎ．Ｔｗｏｋｉｎｄｓｏｆｍｏｄｅｌｓｗｅｒｅａｄｏｐｔｅｄ，ｔｈｅＣｏａｌｅＭｃＮｅｉｌ′ｓｍ…     

Production and detection of cold antihydrogen atoms

A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be invariant under the combined discrete operations of charge conjugation, parity and time reversal. Antimatter, the existence of which was predicted by Dirac, can be used to test the CPT theorem-experimental investigations involving comparisons of particles with antiparticles are numerous. Cold atoms and anti-atoms, such as hydrogen and antihydrogen, could form the basis of a new precise test, as CPT invariance implies that they must have the same spectrum. Observations of antihydrogen in small quantities and at high energies have been reported at the European Organization for Nuclear Research (CERN) and at Fermilab, but these experiments were not suited to precision comparison measurements. Here we demonstrate the production of antihydrogen atoms at very low energy by mixing trapped antiprotons and positrons in a cryogenic environment. The neutral anti-atoms have been detected directly when they escape the trap and annihilate, producing a characteristic signature in an imaging particle detector.     

Electrophorèse sur gel d'amidon des lipoprotéines sériques humaines

Summary The electrophoretic pattern of human serum lipoproteins after migration in starch gel is different from that obtained by other zone electrophoresis techniques. The most important component which migrates between the slot and slow alpha — 2 globulins may be identified as the component being precipitated by dextrane Sulfate and calcium chloride. The other components have the same mobility as either beta or alpha globulins.     

人口线性系统模型探讨

本文提出人口系统发展方程的一种改进形式。它使人口系统模型与一般线性系统模型具有等价的公式表达,并使人口控制理论与现代系统控制理论联系起来。本文提出的方法在应用上具有更简单、直观的形式,它可以作为人口预测与人口最优控制的一种计算方法。     

基于紧致编码的高阶神经网络光计算

提出一种能压缩三阶神经网络的互连张量规模近一半的紧致编码方法。设计两种光电混和系统-非相干多重成象系统和非相干相关系统,并用它实现了三阶互连的二维神经网络,构成图象平方关联存贮器。在光学实现中,借助于一种多重矩阵排列方式,作者用一块二维掩模板表示六维的互连张量,用二维的发光二极管(LED)阵列表示四维的输入张量,实验结果与数值模拟的结果吻合。