设备选型指南

~~设备选型指南     

设备选型指南

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Efficient measurement of microstructural surface area using trisector

It is shown that just three appropriately chosen metallographic sections can yield an efficient and reliable estimate of the total area of the internal microstructural boundaries per unit volume S_v in a microstructure having an arbitrary and unknown anisotropy and geometry. The following sampling scheme is required. (1) Choose a reference direction (called “vertical axis”) such that most of the surface elements of interest are not parallel to the selected reference direction (vertical axis). (2) Observe the microstructure on three metallographic sections that are mutually at an angle of 120 deg and contain the vertical axis. (3) Superimpose a set ofcycloid shape test lines on these metallographic sections (called vertical sections) such that the cycloid minor axis is parallel to the vertical axis, and estimate the average number of intersections between these test lines and the microstructural boundaries per unit test line length, [P_L ^c]₃. The surface area per unit volume S_v is given by S_v = [P_L ^c]₃ To emphasize the preceding sampling requirements, the composite test probe is called “trisector. ” It is also shown that independent random sections are not useful for estimation of S_v of anisotropic microstructural surfaces, in general. Further, two perpendicular vertical sections are also not generally useful for a reliable estimation of S_v in anisotropic microstructures. William J. Drury, Formerly Graduate Student, School of Materials Science and Engineering, Georgia Institute of Technology     

Guide to conducting a psychological autopsy.

Much of the writing on the psychological autopsy is reviewed. Several writers' opinions about what should be included in a comprehensive behavioral analysis conducted after an individual's death are compiled in an Appendix. Several additional and new areas to be covered in a psychological autopsy are included. The primary emphasis is on the provision of a practical guide for the working professional. Twenty-four separate factors, ranging from reconstruction of events that occurred before the death to the deceased's family death history, are presented. Some legal considerations are examined briefly in order to acquaint the professional with the significant impact that the results can have on family benefits and criminal prosecution. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Virtual Teams: Guide to Successful Implementation

The successful initiation and execution of a virtual team is gaining increasing attention in the design and construction community. From opportunities to integrate international and multidisciplinary teams to the opportunity to leverage the best resources in an organization on a given project, virtual teams can transform the concept of project planning and execution. However, potential barriers exist in several areas to the successful implementation of virtual teams. The needs of increased management emphasis, social and cultural understanding, and emphasis on common goals are only a few of the nontechnical factors that can turn successful virtual teaming into virtual frustration. When combined with traditional technical challenges including compatibility of systems, security, and the selection of appropriate technologies, the line between leveraging virtual technologies for enhanced solutions and introducing additional complications into the project process is one that can be easily crossed. This paper presents the findings of research that addresses the opportunities and potential barriers to successful virtual teams in the engineering, procurement, and construction industry. Combining results from current research, industry practices, and early results from nonconstruction industries, the research findings provide an initial path to successful virtual team implementation.     

连铸热坯表面温度可见光谱CCD辐射测温方法

针对连铸坯表面测温现状和存在的问题,建立了双色法(R、G)与单色法(B)相结合的实时测温模型.采用可见光面阵CCD图像传感器进行铸坯表面图像采集,实验研究了不同光圈(F)与积分时间下的R(红)、G(绿)、B(蓝)三基色值随温度的变化规律和动态响应区间.利用计算机图像处理技术建立了连铸热坯表面二维温度场与RGB的关联关系,实现了连铸热坯表面温度场的在线测量.通过控制CCD传感器光积分时间以提高CCD传感器的动态响应范围,为实现连铸坯表面温度场在线测量提供了理论基础和技术支撑.