塑壳式断路器的应用

介绍了塑壳式断路器的常用电气参数,说明了在使用塑壳式断路器时要经过计算,并结合电网频率、环境温度等,选用适合的塑壳式断路器;介绍了漏电断路器的使用注意事项,以及用于电动机保护与用于线路保护的塑壳式断路器参数的不同。     

基于Vega的飞机防滑刹车系统视景仿真

在机载机电设备综合控制管理仿真平台的设计中,为了改变过去仿真时只是单一的数字或曲线显示仿真结果的状况,直观形象地显示仿真过程,加入了视景仿真模块。飞机防滑刹车系统作为该平台的一个子系统,建立了一个对该系统进行实时视景仿真的分布式的体系结构,其中视景驱动程序的设计采用基于MFC的Vega。     

混流式水轮机蜗壳改造的型线优化及数值模拟

针对长期运行于含泥沙水流的混流式水轮机蜗壳,提出基于蜗壳改造的型线优化方案.利用数值模拟的方法对改型前与改型后的蜗壳进行数值模拟,给出了改造后的蜗壳和原蜗壳的水动力学特性的差异.得到一种工程中可行的抗泥沙磨损,提高水力性能的蜗壳改造方法.经3 a运行后检查证明蜗壳磨蚀情况得到明显改善.     

从格理论角度对英语双宾语的分析和思考

双宾语结构是生成语法一直在讨论的焦点之一。根据格理论的基本观点,指出了双宾语现象对格理论带来的挑战,分析了在GB框架下通过内在格和结构格的划分对双宾语现象提供的解释。尽管存在一些不足,内在格和结构格的划分法仍不失为一个较为可行的方法。     

基于梯度的结构相似度的图像质量评价方法

虽然基于结构信息的图像质量评价方法——结构相似度（SSIM）模型结构简单、评价性能优于峰值信噪比（PSNR）或均方误差（MSE）模型，但SSIM模型不能较好地评价严重模糊的降质图像．文中提出了一种基于梯度的结构相似度（GSSIM）图像质量评价方法，该方法将梯度作为图像的主要结构信息．实验结果表明，GSSIM模型比SSIM和PSNR（MSE）模型更符合人眼视觉系统特性，能较好地评价模糊图像的质量．     

Analyzing and Designing Business Processes Management System Based on Transformation of Instantiated Ontology’s State

0 IntroductionIn the last ten years ,there were many attempts to analyzeand model the information systems to support businessprocesses . Academics and business practitioners have been de-veloping various methodologies .Froma technological point ofview, much progress has been made. Unfortunately,despiteof all thejubilant stories of suppliers ,the application of busi-ness process management(BPM) is still li mited. Most meth-odologies generally lack of actual guidance on deriving aprocess desig…     

Multi secret image color visual cryptography schemes for general access structures

In the proposed visual cryptography schemes for general access structures, the single secret image black-and-white visual cryptography schemes with meaningful shares have been constructed, in which the shares are innocent looking images. The meaningful shares have not been realized in single secret image color schemes; neither have the multi secret images color schemes. In this paper, the multi secret images color visual cryptography schemes for general access structures with meaningful shares are constructed by the method of matrix concatenation, the pixel expansion is obtained, and the validity of the scheme is proven. In our scheme, the different combination of meaningful color shares can be used to recover distinct color secret images. The multi secret images black-and-white visual cryptography scheme is a special case of our color scheme.     

The role of different cues in the brain mechanism on visual spatial attention

The visual spatial attention mechanism in the brain was studied in 16 young subjects through the visual search paradigm of precue-target by the event-related potential (ERP) technique, with the attentive ranges cued by different scales of Chinese character and region cues. The results showed that the response time for Chinese character cues was much longer than that for region cues especially for small region cues. With the exterior interferences, the target stimuli recognition under region cues was much quicker than that under Chinese character cues. Compared with that under region cues, targets under Chinese character cues could lead to increase of the posterior P1, decrease of the N1 and increase of the P2. It should also be noted that the differences between region cues and Chinese character cues were affected by the interference types. Under exterior interferences, no significant difference was found between region cues and Chinese character cues; however, it was not the case under the interior interferences. Considering the difference between the exterior interferences and the interior interferences, we could conclude that with the increase of difficulty in target recognition there was obvious difference in the consumption of anterior frontal resources by target stimuli under the two kinds of cues.     

EWB在电子技术基础课程教学中的应用

计算机在电子设计自动化方面的不断发展,也为教学改革提供了客观条件,为激发学生的学习兴趣及提高教学中的直观性、可视性,我们将EWB软件应用于电子技术基础教学中,做了新的教学尝试。     

用VC++实现有限元数据文件输入的可视化

在用Fortran语言编写有限元程序中往往涉及数据文件的建立 ,其过程十分不直观。本文应用VC + +编写一应用程序 ,实现了在有限元程序分析中数据文件生成的可视化 ,并给出了全部源代码。文后举例说明了该程序的应用