Research on Computing Models of CBR Similarity

Several models of measuring case similarity in CBR systems are deeply explored. We also discuss the case matching process, and present three matching functions. Finally, we illustrate the significance of the models in CBR(Case Based Reasoning) systems implementation.     

Endogenously generated amyloid β increases membrane fluidity in neural 2a cells

The effect of endogenously generated amyloid β on membrane fluidity was investigated in Neural 2a cells stably expressing Swedish mutant amyloid precursor protein (APPswe). Membrane fluidity was studied by fluorescence polarizability using 1,6-Diphenyl-1,3,5-Hexatriene (DPH) as the fluorescence probe. It was found that the membrane fluidity in APPswe cells was significantly higher than that in its wild type counterparts. Alleviating the effect of amyloid β either by γ secretase activity inhibition or by amy...     

高效联合变换相关实验研究

本文提出了种实现高联合交换相关的方案，通过把输入面划分为上个大小相等的窗口，并利用楔镜阵列使相应于不同窗口的光学信息在谱面上形成联合功率谱阵列，在输出面上可以获得增强了相关信号，文中分析了系统原理，并给了出实验结果。     

Thermodynamic modeling of the Ge-La binary system

The Ge-La binary system was critically assessed by means of the calculation of phase diagram (CALPHAD) technique. The associate model was used for the liquid phase containing the constituent species Ge, La, Ge₃La₅, and Ge_1.7La. The terminal solid solution diamond-(Ge) with a small solubility of La was described using the substitutional model, in which the excess Gibbs energy was formulated with the Redlich-Kister equation. The compounds with homogeneity ranges, α(Ge_1.7La), β(Ge_1.7La), and (GeLa), were modeled using two sublattices as α(Ge,La)_1.7La, β(Ge,La)_1.7La, and (Ge,La)(Ge,La), respectively. The intermediate phases with no solubility ranges, Ge₄La₅, Ge₃La₄, Ge₃La₅, and GeLa₃, were treated as stoichiometric compounds. The three allotropic modifications of La, dhcp-La, fcc-La, and bcc-La, were kept as pure element phases since no solubility of Ge in La was reported. A set of self-consistent thermodynamic parameters of the Ge-La binary system was obtained. The calculation results agree well with the available experimental data from literatures.     

基于双液晶相位延迟器调制的偏振光源

针对常规偏振发生器中机械转动带来系统误差大的问题,提出了基于双液晶相位延迟器调制的偏振光发生系统,该系统由偏振片结合两片液晶相位可变延迟器(Liquid Crystal Variable Retarder,LCVR)组成.利用液晶相位可变延迟器的电控作用,计算机控制双LCVR延迟量的不同组合,实现对入射光波偏振态的调制.通过对Stokes参数定义中的6种特定偏振态的测定,验证了此方案的可行性,偏振度的精度可达千分之一,可为系统定标和测试提供更加精确的偏振光源,并能大幅提高偏振测量系统的精度、节省实验时间.     

Reverse-transformation austenite structure control with micro/nanometer size

To control the reverse-transformation austenite structure through manipulation of the micro/nanometer grain structure, the influences of cold deformation and annealing parameters on the microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. The samples were first cold-rolled, and then samples deformed to different extents were annealed at different temperatures. The microstructure evolutions were analyzed by optical microscopy, scanning electron microscopy (SEM), magnetic measurements, and X-ray diffraction (XRD); the mechanical properties are also determined by tensile tests. The results showed that the fraction of stain-induced martensite was approximately 72% in the 90% cold-rolled steel. The micro/nanometric microstructure was obtained after reversion annealing at 820-870℃ for 60 s. Nearly 100% reversed austenite was obtained in samples annealed at 850℃, where grains with a diameter ≤ 500 nm accounted for 30% and those with a diameter >0.5 μm accounted for 70%. The micro/nanometer-grain steel exhibited not only a high strength level (approximately 959 MPa) but also a desirable elongation of approximately 45%.     

高温蒸汽热泵的多目标参数设计优化

为了进一步节能减排,并根据用户负荷需求,设计出合适的高温蒸汽热泵系统,提出了一种基于多目标优化的高温蒸汽热泵设计优化方法。首先根据选取的高温蒸汽热泵结构,说明系统各子系统的选型并研究高温蒸汽热泵的系统机理,建立系统的静态模型,提出了高温整齐热泵的■效率计算方法;然后确定了系统结构参数优化问题的优化参数,以■效率和总成本作为优化目标,基于多目标人工蜂群算法(multi-objective artificial bee colony algorithm, MOABC),建立高温蒸汽热泵的多目标优化模型;最后对不同工况下的系统■损失以及循环性能系数(coefficient of performance, COP)分别进行了MOABC的优化。结果表明,使用■效率作为能效指标可以提升高温蒸汽热泵系统的能源品质;而使用COP作为能效指标则降低了系统的能耗。     

学龄前和学龄期儿童希氏束以上心动过速性心肌病高危因素分析

目的探讨学龄前和学龄期儿童希氏束以上的心动过速(室上性心动过速)与心动过速性心肌病的相关性及高危因素.方法选取室上性心动过速患儿179例,根据心动过速时心功能状态分为心肌病组23例,非心肌病组156例.分析患儿性别、年龄、发作类型、发作频率、持续时间、心室率与心功能损伤的关系和相关高危因素.结果 179例患儿中心动过速性心肌病23例,其中房室折返性、房室结折返性、无明确分类的心肌病分别为7例、10例、6例.房速所致心动过速性心肌病发生率为25.00%(8/32),明显高于阵发性室上性心动过速所致的心肌病发生率10.20%(15/147),差异具有统计学意义(P0.05).心肌病组患儿中房速所占比例、发作持续时间明显高于非心肌病组患儿,发作频率明显低于非心肌病组患儿,差异均具有统计学意义(P0.05).二元Logistic回归分析显示:发作持续时间是心动过速性心肌病的独立影响因素.结论学龄前和学龄期儿童室上性心动过速所致心动过速性心肌病的发生率为12.85%,其中房速所致的心肌病发生率明显高于阵发性室上性心动过速,发作持续时间是唯一高危因素.     

调和NA群上的Hardy不确定原理

首先介绍了调和NA群的基本结构和球函数的性质.其次基于调和NA群上的Helgason-Fourier变换及相应于Laplace-Beltrami算子的热核,在NA群上建立了Hardy不确定原理.所得结论推广了Thangavelu（2002年）的部分结果.     

影响磁头超薄气膜飞行稳态特性因素的数值分析

利用有限差分原理对修正后的气体雷诺方程进行离散,并以剪切流为迭代主项求解获得了超薄气膜润滑轴承的压力分布.在此基础上,通过改变磁头初始工作条件,如气膜特征高度、初始俯仰角、磁盘旋转速度,分别计算得到了气膜轴承在稳态下的飞行特性参数,包括气浮力、气浮力转矩、最大气浮力、最小气浮力等.文中还详细分析了这些初始工作条件对稳态下磁头飞行特性参数的影响.计算结果表明:随着气膜特征高度的降低和初始俯仰角的减小,气体轴承刚度增大;气膜特征高度不变时转速变化对特性参数的影响与俯仰角不变时转速对特性参数的影响具有相同的变化趋势.