Effects of a new cholecystokinin antagonist (GE 410) on the smooth muscle of the guinea pig ileum

Summary Suc-Tyr-(SE)-Met-Gly-Trp-Met-Asp--phenethylamide (GE 410) competitively antagonized the contractions of smooth muscle strips from guinea pig ileum (pA₂=7.6, n=0.95) induced by cholecystokinin-octapeptide (CCK8). GE 410 inhibited the electrically-induced cholinergically mediated contractile responses and the [³H]ACh release in the ileum, as well as the CCK-stimulated electrical contractile responses and the [³H]ACh release in the cholinergic nerve terminals. The results suggest the existence of CCK-receptors not only in the smooth muscles but also on the neurons.     

ParalelComputationofViscousFluidFlow

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Optimized LDPC differential-encoded 16QAM scheme for high-speed transmission systems

The 16-ary quadrature amplitude modulation （16QAM） is a high spectral efficient scheme for high-speed transmission systems. To remove the phase ambiguity in the coherent detection system, differential-encoded 16QAM （DE-16QAM） is usually used, however, it will cause performance degradation about 3 dB as compared to the conventional 16QAM. To overcome the performance loss, a serial concatenated system with outer low density parity check （LDPC） codes and inner DE-16QAM is proposed. At the receiver, joint iterative differential demodulation and decoding （ID） is carried out to approach the maximum likelihood performance. Moreover, a genetic evolution algorithm based on the extrinsic information transfer chart is proposed to optimize the degree distribution of the outer LDPC codes. Both theoretical analyses and simulation results indicate that this algorithm not only compensates the performance loss, but also obtains a significant performance gain, which is up to 1 dB as compared to the conventional non-DE-16QAM.     

区间删失数据情形下GE分布参数的最大似然估计(英文)

讨论了样本数据为区间型数据时参数的最大似然估计问题.当数据为区间删失情形时,参数最大似然估计的精确表达式不存在,甚至近似解都很难得到.由于区间型数据是一种不完全数据,所以利用EM算法来求参数的近似最大似然估计.为了演示,提供了一个真实寿命数据分析的实例.     

在GE90-30控制系统上集成E3 Plus的实践

简述了Rockwell的E3 Plus电机过载继电器低压智能产品功能及其调试,探讨了在GE90-30PLC控制系统上如何通过Devicenet网络集成Rockwell低压智能产品,介绍了系统的集成配置过程以及如何实现对配电设备的远程监控。     

Google Earth-based dynamic visualization system for storm surge flood routing

To describe the dynamic process of flood routing intuitively and realistically when storm surge disaster occurs, a method for ArcGIS data and Google Earth （GE） data integration is proposed, which realizes the impor- ting and integrating of basic geographic information into GE. Based on SketchUp and AutoCAD software, three- dimension （3D） visualization of seawall and other tidal defense structures is achieved. By employing Microsoft Foundation Class Library （MFC）, the related system modules and storm surge flood routing dynamic visualization system are developed. Therefore, dynamic visualization of flood routing process and interactive query of sub- merged area and inundated depth are implemented. A practical application case study of Tianjin Binhai New Area provides decision-making support for coastal seawall planning and storm surge disaster prevention and reduction.     

科技英语之我见

从词汇、语法和语体的角度看,科技英语(EST)和普通英语(GE)既有不少共同之点,又有许多不同之处。无疑,加强EST的教学和研究,将有助于促进我国广大的科技人员和理工科大学生掌握好科技英语。本文探讨科技英语对世界现代科学技术的发展以及我国社会主义建设所起的巨大作用,介绍上海机械学院于1979年在全国首创科技英语专业的时代背景以及其课程设置和培养目标。最后,作者就其所见,论述了普通英语专业和科技英语专业的区别和任务,并预测科技英语今后的发展前景。     

华盾公司农用塑料制品发展战略的模型分析

结合塑料工业的发展现状与实际问题，利用通用电气公司的理论模型对华盾公司当前的产品结构进行分析，建立了５种产品发展战略方案模型，通过对模型的评价，确立了一个具有行业特色并适合企业发展状况的产品发展战略方案。     

加州大学洛杉矶分校“新”通识教育的改革与发展

加州大学洛杉矶分校（ UCLA）将20世纪90年代以来学校的通识教育称之为“新”通识教育,并对通识教育课程进行了变革和创新。该过程经历了四个阶段：构想期（1993-1996）、实施与评估期（1996-1998）、新生聚合（ cluster）项目（1998-2002）、辐射期（2002至今）,并确立了新的课程方案。UCLA 为本科生开设了通识教育研讨课（ Fiat Lux）、新生聚合课程,以及单学季课程。UCLA“新”通识教育的改革和发展既把握了其核心价值和理念,又体现了通识课程研究的校本特色。这可为我国大学的通识教育改革提供借鉴。