谈谈重庆天然气干管隧道穿越长江工程 ――介绍一种大型管道穿越大江(河)的新工艺

在江底建隧道安装大型天然气管道工艺具有工程质量优、建设投资低、管理维护方便、用途可予扩充等诸多优点.文章以重庆市新建成投运的天然气主干管(Φ426×10mm)穿越长江的江底隧道工程与以往的各类天然气干管穿、跨越大江(河)工程相比进行介绍.诚望能在国家和各地城市建设中推广应用,必将获得巨大的经济和社会效益.     

化学结构的计算机处理（V

根据歧义结构的不同特点，结合计算机结构处理的实际要求，可将歧义结构分为互变异构、环交替键化合物、带离域电荷离子、配价键化合物、金属盐、有机氮盐及类似物、多肽、碳水化合物等不同类型，分别采用转换录入、选择录入、多重录入等方式解决结构歧义性问题。本文介绍实际处理中的一些基本算法，并举例说明。     

Involving domain experts in assistive technology research

Teams engaging in assistive technology research should include expertise in the domain of disability itself, in addition to other areas of expertise that are more typical in human–computer interaction (HCI) research, such as computer science and psychology. However, unexpected problems can arise when HCI researchers do not adequately plan the involvement of domain experts in a research project. Although many research teams have included domain experts when designing assistive technologies, there has been little work published on how to best involve these experts in the research process. This paper is a first step towards filling that void. Based on the authors’ own experiences involving domain experts in research, as well as those documented in the literature, five types of domain experts and three broad roles that domain experts can play are identified, and five guidelines for their involvement are presented. This analysis will be useful to anyone in the assistive technology and universal accessibility communities, especially those who are in the early stages of conducting research in this area. It is intended to lay the foundation of best practices for involving domain experts in assistive technology research.     

High voltage floating gate array transistors

A new high voltage field-effect transistor is described. It features an array of uncontacted gate elements between the main gate and the drain which float so as to inhibit avalanche breakdown. Good agreement is obtained between model predictions and the performance of experimental devices fabricated in Si-TaSi/sub 2/ semiconductor-metal eutectic material. Transistors are demonstrated which hold off up to 1000 V, compared with the avalanche breakdown potential of 300 V or less expected for conventional devices made with similarly doped silicon.<>     

MMP and TIMP expression pattern in pleural effusions of different origins

The matrix metalloproteinases (MMP) are proteolytic enzymes that are essentially involved in the turnover of the extracellular matrix (ECM). Their activity is counterbalanced by specific antagonists, the tissue inhibitors of metalloproteinases (TIMP). In this study, we sought to analyze the expression of MMP and TIMP isoforms in pleural effusions from 88 patients. We compared MMP and TIMP isoform expression in transudates (n = 21) and exudates (n = 67), the latter divided into exudates of paraneoplastic (n = 46) or parainfectious (n = 21) origin. Zymographic and Western blot analyses revealed constant expression of interstitial collagenase (MMP-1), gelatinase-A (MMP-2), and TIMP-1 in all 88 samples. In contrast, analyses of gelatinase-B (MMP-9) demonstrated a specific expression pattern, with high expression in exudates and lack of expression in transudates. Neutrophil collagenase (MMP-8) was detected in trace amounts, and correlated with the number of neutrophils in the effusion. Low levels of TIMP-2 were detected only in exudates and not in transudates. Quantitative analysis of the expression ratio of gelatinase-B to gelatinase-A revealed statistically significant differences between effusions of different origin. The ratio was highest in exudates of paraneoplastic origin and lowest in transudates. Our data thus suggest that interstitial collagenase, gelatinase-A, and TIMP-1 play a role in homeostasis of the pleural space in vivo as constitutively expressed proteins, whereas gelatinase-B and TIMP-2 expression are induced in specific disease states. These observations contribute to the understanding of the pathophysiology of pleural effusions, and may help to characterize and possibly distinguish effusions of different origin.     

熟料窑运行状态检测应用研究

阐述了对回转窑运行轴线进行监测的重要性 ;介绍了一种回转窑运行轴线监测的研究成果 ,该方法采用 15°方向键相法测量窑体截面的回转中心 ,通过对窑各挡支承轮带两侧的截面测量而获得运行轴线 ;研制的监测系统结构简单 ,运行可靠 ,监测精度高 ,操作、使用、维护方便 ,并成功地应用于实际生产中     

国内外生物降解性润滑剂现状及发展趋势

介绍了国外生物降解性润滑剂的种类、性能及应用情况,提出了我国生物降解性润滑剂将来的研究方向及对策意见。     

圆锥孔双列圆柱滚子轴承径向游隙的合理选择

论述了圆锥孔双列圆柱滚子轴承的安装，温度，载荷对轴承工作游隙的影响以及工作游隙对轴承使用寿命的影响，并分析了相互关系，介绍了一种合理选择径向游隙的方法。     

Eye movement as a cue to figure motion in anorthoscopic perception.

When a figure moves behind a narrow aperture in an opaque surface, if it is perceived as a figure, its shape will often appear distorted. Under such anorthoscopic conditions, the speed or direction of the object's motion is ambiguous. However, when the observer simultaneously tracks a moving target, a figure is always perceived, and its precise shape is a function of the speed or direction of tracking. The figure is seen as moving with the speed or in the direction of the target. Thus, it is argued that eye movement serves as a cue to the figure's motion, which, in turn, determines its perceived length or orientation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

离退休人员门诊规范化服务

该文对微机械气流式水平姿态传感器敏感机理进行了三维的有限元分析.利用ANSYS-FLOTRAN CFD软件,通过建模、划分网格、加载和求解等途径,计算了微机械气流式水平姿态传感器敏感元件密闭腔体中气流速度在不同倾斜状态下的分布.阐明微机械气流式水平姿态传感器的敏感机理,为气流式水平姿态传感器的优化设计开辟了更精确的研究途径.