CdZnTe核辐射探测器的制备

本文简要介绍了采用国产碲锌镉(CdZnTe)单晶材料制备的CdznTe核辐射探测器工艺及测试结果.对α带电粒子Thc-c/(6.04MeV、8.78MeV)FWHM=2.O%、241 Am(5.486MeV)FWHM=2.3%,137Cs低能7(662keV)FWHM=9.7%和207Bi(1048.1keV、975.6keV)内转换电子所测定的能谱.     

Do problematic and non-problematic video game players differ in extraversion,trait empathy,social capital and prosocial tendencies?

The increasing popularity of online and multiplayer games has meant that for many, social interaction and cooperation are vital components of the gaming experience. Previous research has suggested that not only has this made gaming more attractive to socially oriented people but also that it may be socially beneficial in terms of social capital and prosocial behaviors. However, for problematic video game players (those showing signs of compulsive or detrimental video game use), this may not be the case, and a number of theories hold deficiencies in socializing in real life as central to the development of this issue. In the present study, an online questionnaire completed by 416 participants assessed problematic video game use, extraversion, trait empathy, online and offline social capital and prosocial tendencies. Contrary to hypotheses, non-problematic, problematic and non-gamers did not differ in empathy, extraversion or prosocial tendencies. Problematic video game play was, however, associated with significantly higher online social capital and lower offline social capital whereas non-problematic players demonstrated only higher online capital than non-players. This highlights the importance of social support but suggests personality is not an influential factor.     

一种用于GPS信号快速捕获的自适应算法

采用聂孟-皮尔逊准则,以发现概率为性能指标,对基于FFT非相干累加的GPS信号捕获算法的性能进行了详细的理论推导,给出了该种方法的理论性能上界, 提出了一种用于快速捕获的高效自适应算法,并通过系统仿真对理论结果进行了验证.对实际情况中概率分布的合理近似使理论分析过程得以简化,并使判决门限可根据噪声方差及累加次数进行自适应调整的算法可以直接应用于实时GPS接收机的设计.     

涂刷有机硅的道路混凝土抗盐冻性能研究

为了配制高抗盐冻的高性能道路混凝土,自行配制有机硅涂料,并参照CDF混凝土抗盐冻试验方法,研究涂刷有机硅涂料的高性能道路混凝土的抗盐冻性能.结果表明,涂刷该有机硅涂料后,3种水灰比(0.40、0.36和0.32)的高性能混凝土经56次盐冻后剥蚀量均降低了99%以上,相对动弹性模量损失率降低了32%～42%,混凝土表面无明显剥蚀痕迹,显著地提高了高性能道路混凝土的抗盐冻性能,配制出了高抗盐冻的高性能道路混凝土.     

磁悬浮转子真空计的研究历程

磁悬浮转子真空计被广泛应用于各个领域,在10^-4-1 Pa下具有相当高的精确度,以其优越的性能在其中占有重要地位,被广泛用于传递标准。然而,残余阻尼的存在严重影响了磁悬浮转子真空计的下限扩展,其中以涡流效应的影响最为显著,相对于涡流效应,测量产生的弛豫效应和科里奥利效应可以忽略不计。本文简要介绍了磁悬浮转子真空计的结构和原理,概述了其研究历程,重点阐述了残余阻尼和切向动量传递系数的相关研究,并分析并总结了一些重要因素对它们的影响。残余阻尼的相关研究主要从涡流效应、温度效应、弛豫效应、科里奥利效应和振动这几个方面进行了介绍;在切向动量传递系数方面上,主要说明了气体种类和压力对它的影响。最后提出了一些改进猜想及后续工作的研究方向。     

The JERS Amazon Multi-season Mapping Study (JAMMS): Observation strategies and data characteristics

The Japanese Earth Resources Satellite (JERS-1) Amazon Multiseason Mapping Study (JAMMS), part of the Global Rain Forest Mapping (GRFM) project led by the National Space Development Agency of Japan (NASDA), had an ambitious agenda to map the entire Amazon river floodplain (and surrounding areas) twice at high resolution. The observation strategy carried out by NASDA for the JAMMS project and the other elements of the GRFM project (1995-1997) constituted the first time that a spaceborne Synthetic Aperture Radar (SAR) successfully implemented a continental scale, coordinated seasonal mapping campaign. This observation strategy, chosen around the flooding cycle of the major river systems, was designed to provide the first high-resolution measurement of inundation extent by the Amazon river and its tributaries. In order for the scientific community at large to be able to exploit this dataset, the characteristics of the data (resolution, radiometric and geometric calibration, coverage, and ability to be mosaicked) must be well understood. We find that the quantization of the Alaska SAR Facility (ASF) imagery impacts the range of backscatter values that may be observed, in contrast to the NASDA processed imagery. The noise equivalent σ 0 is -15 dB at worst, but improves to about -20 dB at the centre of the swath. The resolution of the ASF imagery is slightly worse than that processed by NASDA. The initial geolocation accuracy of the ASF processed imagery is quite poor, but may be improved during the mosaicking process. The relative radiometric calibration of the data may be improved to about 0.2 dB by comparing the calibration of overlapping imagery, and through a careful analysis of cross-track trends in the data.     

配给能源采集供电:无线传感器节点的功率约束

让周遭的系统能够自动感测环境变化并做出反应,势必将对于人类的生活造成重大改变。无线传感器网络是多个分布式传感器实作（节点）组成的系统,能够共同透过相互无线通信的方式响应实体变化。本文将重点介绍节点的最新进展,并推广对于系统层级设计方法的需求。     

XYZ-125稀油站系统管径优化可行性分析

采油厂为C5101A/B往复式压缩机提供润滑的XYZ-125型稀油站,按照传统设计方法计算与设计,管道通径选择过大,造成设备体积庞大,生产制造成本过高.针对此情况,对XYZ-125稀油站管道系统进行分析与计算,在传统设计的基础上,采用现代计算机模拟优化的方法,通过建立XYZ-125稀油站管道中压力峰值区域三维模型,导入ANSYS软件进行模拟分析后,得出稀油站工作时液流的流动状态参数,为系统优化可行性分析提供直接数据支持和理论依据.优化后的系统体积减小,降低了整个设备的生产制造成本.     

微波加热法合成CaS:Ce,Sm及其发光特性

用微波加热法合成CaS:Ce,Sm材料,由光谱可知,其光激励光谱和发射光谱分别位于红外和可见光区域,因而只要选择适当的光探测方法即可记录发射光.与高温固相法比较,微波加热法合成能够减少S的升华,提高反应速率,同时能够有效回避保护气氛并最大限度地去除对环境的污染;在生成CaS的同时完成稀土金属的掺杂,从而比较容易的得到了纯度较高的CaS:Ce,Sm.     

稀薄气体流动的粒子图像测速实验研究

建立了一套可对真空度进行调节的实验装置,从大气压开始逐渐降低系统压力,进行系列稀薄气体流动的PIV流场实验.系统压力从101kPa、90kPa逐次降至10kPa,使用所选粒子在不同系统压力下分别进行PIV实验获得测量区域流场分布情况.运用计算流体力学的方法模拟大气压条件下实验区域的内部流动,对比结果发现该种条件下数值模...