A non-commutative time-frequency tomography

The characterization of non-stationary signal requires joint time and frequency information. However, time and frequency are a pair of non-commuting variables that cannot constitute a joint probability density in the time-frequency plane. The time-frequency distributions have difficult interpretation problems arising from negative and complex values or spurious components. In this paper, we get time-frequency information from the marginal distributions in rotated directions in the time-frequency plane. The rigorous probability interpretation of the marginal distributions is without any ambiguities. This time-frequency transformation is similar to the computerized axial tomography (CT or CAT) and is applied to signal analysis and signal detection and reveals a lot of advantages especially in the signal detection of the low signal/noise (S/N).     

Weight measurement using image-based pose analysis

Image-based gait analysis as a means of biometric identification has attracted much research attention. Most of the existing methods focus on human identification, posture analysis and movement tracking. There have been few investigations on measuring the carried load based on the carrier＇s gait characteristics by automatic image processing. Nevertheless, this measurement is very useful in a number of applications, such as the study of the carried load on the postural development of children and adolescence. In this paper, we investigate how to automatically estimate the carried weight from a sequence of images. We present a method to extract human gait silhouette based on an observation that humans tend to minimize the energy during motion. We compute several angles of body leaning and determine the relationship of the carried weight, the leaning angles and the centroid location according to a human kinetic study. Our weight determination method has been verified successfully by experiments.     

超立方体结构并行处理系统的可靠性的计算机仿真

本文介绍立方体结构并行处理系统的原理及可靠性的计算机仿真并给出结果     

脉冲等离子体气相合成氮化硼的研究

以Ｂ２Ｏ３粉扩ＮＨ３为原料，用脉冲等离子体反应器合成ＢＮ，所得产品经Ｘ射线衍射，红外光谱分析表明，产品中除含六方氮化硼外，还含有少量立方氮化硼，生产工艺简单。     

对无机化学教材中引进锰的自由能——氧化态图的探讨

本文对无机化学教材中引进锰的自由能——氧化态图进行了讨论.这对无机化学的教材改革是十分有意义的.对氧化态图直观性的分析和绘制氧化态图的研究对教学更具影响.     

革胡子鲇触须和口腔粘膜的味觉器官

应用组织学切片和电镜扫描的方法，对革胡子鲇上颌须和口腔味蕾的组织形态特征进行了比较研究．发现分属于两个亚感觉通路（迷走叶和面叶味觉系统）的两类味蕾，其感受器细胞组成和形态结构没有明显的不同，主要区别为味蕾是否通过味孔与外界接触，以及在上皮中的分布状况．革胡子鲇口腔内也有少量面神经叶支配的味蕾位于口腔横瓣上．由迷走神经叶支配的味蕾成簇集中腭部．感觉细胞的微绒毛突出于顶端，有味刺激物能直接到达味感觉细胞膜上．其形态结构表明，鱼类味觉是接触性或近距离化学感受器．     

基于APP平台的TDC-3000 DCS实时数据存取技术

探讨了基于Honeywell APP平台的TDC-3000 DCS实时数据采集方法,阐述了通讯系统的构成和软件的设计思路,并进一步研究了基于B/S结构的DCS实时数据在局域网上的存取和应用问题.此技术已获成功应用并具有通讯系统结构简单、技术可靠、实施成本低等特点.     

数显温控精确测量金属丝的温度系数

在传统金属导体温度系数测量中对于金属丝的加热通常采用了水浴加热法或油浸加热法。这两种方法存在着短路、产生不良气体污染、温度测量不精确等缺点。首次使用了数显温度可控的功率电阻作为金属丝的加热源,在测量中采用了双臂电桥、金属丝的四端电阻接线方式,不仅实现了金属丝的温度可控性和实时测量性,而且将测量精度提高到3%以内。     

称谓语的选用与社会身份关系之表达

称谓语是发话人用来称呼交际对方的用语。但其功能远不止于此，称谓语是社会关系在语言中的表现，它不单纯是语言的称谓系统本身。称谓语的选用能为整个交际活动定下基调，能清楚地反映出交际双方之间的社会关系和他们的社会地位。     

全站仪线路纵、横断面测量

运用全站仪放样及对边测量功能，在已知控制点上设站，方便、快捷、精确的进行线路的纵、横断面测量。