Effects of Solid-State Reaction Synthesis Processing Parameters on Thermoelectric Properties of MgaSi

The Mg2 Si-matrix thermoelectric material was stnthesized by low temperature solid-state renc-tion.This paper studies the effects of holding time and reaction temperatare on the particle size and the properties of the material, and also studies effects of doping elemental Sb, Te and their doping seqence on the properties of the materiol. The result shows that excessirely high temperature and elongated holding time of solid-state reaction are harmful, there is a range of partiele size to ensure optimum properties and the doping sequence of Sb or Te without influencing the properties.     

The Attentional Dynamics of Masked Detection.

A dichoptic masking procedure was used to test whether the mask-dependent cuing effects found in luminance detection by P. L. Smith (2000a) were due to integration masking or interruption masking. Attentional cuing enhanced detection sensitivity (d') when stimuli were backwardly masked with either dichoptic or monoptic masks, whereas no cuing effect was found with unmasked stimuli, implying the mask dependencies were due to interruption of stimulus processing in visual cortex by the mask. The effect is predicted by a gated diffusion process model in which masks interrupt stimulus processing and attention controls the flow of information to a sequential-sampling decision mechanism. The model correctly predicts different patterns of performance for detection and discrimination and cuing effects in simple reaction time. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

快速热处理下镍对锗单晶电学性能的影响

采用磁控溅射法在n-Ge表面镀镍薄膜,通过改变快速热处理时间研究镍对锗单晶的导电型号、电阻率和少子寿命的影响,以及镍在锗中的扩散行为。结果表明：镍在锗中具有向内扩散和向外扩散两种行为,并以受主状态存在,改变了锗内部的载流子的分布;775℃热处理后,镍受主完全补偿原有的施主,使锗由n型转变为P型,随着热处理时间的增加,电阻率下降,镍受主浓度增加。即使微量的镍就可以使锗的少子寿命直线下降至零点几微秒,这表明镍在锗中会引入深能级。     

跟踪-微分器在全捷联制导中的应用分析

以仅能获取角度信息的全捷联导引头为研究对象,针对采用直接微分提取惯性视线角速率时存在的噪声放大问题,基于跟踪微分器设计了一种全捷联制导信息提取算法。结合导引头的性能指标要求,对3种不同形式跟踪微分器的提取效果进行了对比分析。仿真结果表明,采用非线性微分器进行惯性视线角速率提取,可以减小延迟时间,避免噪声放大,有效提高制导精度,具有一定的工程应用价值。     

Optimization of abrasive water jet cutting of ductile materials

Full factorial design of experiments was developed in order to investigate the effects of jet pressure, abrasive mixing rate, cutting feed, and plate thickness upon three response variables, surface finish of cutting wear zone, percentage proportion of striation free area, and maximum width of cut. The set of sixteen experiments was performed on each of the following two ductile materials: AISI 4340 (high strength low alloy steel, hardened to 49HRc) and Aluminum 2219. Analysis of Variance (ANOVA) was performed on experimental data in order to determine the significance of effects of different parameters on the performance measures. It was found that cutting feed and thickness were highly influential parameters, while abrasive mixing rate is influential upon surface roughness only. Strong interaction was found between jet pressure and workpiece material. Multi-criteria numerical optimization was performed in order to simultaneously maximize/minimize different combinations of performance measures.     

对我国油脂深加工的化工产品综述

对我国加速开发植物油脂深加工产品及经济重要性、产品用途、生产工艺等方面作了探讨。介绍了较为成熟的生产工艺,提出了开发生产环氧大豆油、脂肪酸、硬脂酸、甘油、亚油酸、磷脂、糠蜡、植酸钙、肌醇等多种油脂化工产品,创造经济效益的建议。     

机载相控阵雷达杂波谱

介绍机载相控阵雷达所面临的复杂地杂波谱，分侧面阵和前／后向阵两种情况对地杂波谱进行说明，并在此基础上介绍空时二维自适应最佳滤波。     

基于改进2DCNN的高光谱遥感图像处理研究

针对传统遥感图像处理中的时间成本和人工成本高、效率低等问题,以提高遥感高光谱图像分类中的处理速度、精度,降低参数量为目标,提出改进的2DCNN模型En-De-2CP-2DCNN.首先,使用1DCNN、2DCNN与3DCNN在Pavia University HSI数据集上分别进行分类实验,对比分析各自优缺点.其次,在保持较快的处理速度和不增加模型参数量的前提下,选择2DCNN为基础模型,参考SegNet的Encoder-Decoder结构,融入双卷积池化思想进行基础模型改进,同时优化学习策略.结果表明:En-De-2CP-2DCNN模型F1为99.96％,达到3DCNN的同等水平(99.36％),较改进前(97.28％)提高2.68个百分点;处理速度(5 s／epoch)和1DCNN位于同一量级,快于3DCNN(96 s／epoch);参数量(2.01 MB)较改进前降低了1.54 MB,虽高于3DCNN(316 KB),但远低于1DCNN(19.21 MB).En-De-2CP-2DCNN模型在处理速度和参数量方面的改进,有利于进一步实现移动端的轻量化部署.     

水产品加工废水深度处理的试验

进行了用"生物接触氧化-微滤膜"组合工艺对水产品加工废水深度处理的试验研究.试验结果表明:在进水COD约900~1 200 ms/L,水力停留时间>16 h的情况下,平均出水COD<50 ms/t,达到再生水杂用水质标准.同时,研究探讨了处理过程中膜组件的污染及清洗问题,为实际工程中膜的运行提供了必要的参考.