水生态保护与建设的理论问题探讨——以武汉城市圈为视角

自武汉城市圈被评为两型社会综合配套改革实验区以来,面对水环境呈现多样性和复杂性的现状,将武汉城市圈建设成为富有滨水特色的现代化生态城市圈是两型社会建设主题中应有之义,也是推动城市圈生态化发展的必由之路。针对武汉城市圈水生态保护与建设的问题,在阐述了其必然性的基础上,对理论支撑及基本原则作了细致具体的分析,希望能对武汉城市圈水生态保护与建设的实践问题等相关研究有所帮助。     

语言工具书法律术语释义辨析

汉语言文字既是语言学的研究对象,又是法律的规范领域(我国于2000年制定了《通用 语言文字法》)。语言工具书的质量应当引起语言学和法学的双重关注。以发行量极大、流行 范围极广的《现代汉语词典》为例,现行语言工具书对法律术语的释义存在着诸多常识性错误, 这些错误对读者构成法学知识和法律观念传递的障碍。本文以三组作为法律基本要素和法学 核心范畴的法律术语为例,对语言工具书的释义进行辨析,并提出修改建议。     

Low-latency and low-overhead encoder ASIC in the ATLAS LAr calorimeter trigger upgrade

In this article, an encoder Application Specific Integrated Circuit (ASIC) for high-speed serial data transmission is presented. The ASIC implements a low-latency and low-overhead line code and is fabricated with a commercial 0.25-µm Silicon-on-Sapphire CMOS technology. The ASIC operates at 640 MHz with a latency of no greater than 6.25 ns and the overhead of 14.3%. The encoder will be integrated with a serialiser and will be used in the A Toroidal LHC ApparatuS Liquid Argon (LAr) calorimeter Phase-I trigger upgrade.     

家庭装修装饰的误区

本文根据当前家居设计、装修的现状,从六个方面分析了家居设计、装修装饰中存在的问题,阐述了家庭装修装饰存在的误区以及家庭装修装饰误区的解决办法。     

应用型地方高校化工原理实验教学初探

化工原理实验是化工类专业重要的基础实践课程,具有较强的实践性和工程性,对于应用型本科院校培养应用型化工专业人才具有重要的作用。结合化工原理实验课程教学实际,针对实验课程中出现的问题,从课程的教学模式、学生工程概念与实践能力的培养以及分析与解决问题的能力等方面进行初探,以求提高实验课程的教学质量。     

APPROXIMATE DISCRETE VARIABLE OPTIMIZATION OF FRAME STRUCTURES WITH DUAL METHODS

The purpose of this work is to present an efficient method for optimum design of frame structures, using approximation concepts. A dual strategy in which the design variables can be considered as discrete variables is used. A two-level approximation concept is used. In the first level, all the structural response quantities such as forces and displacements are approximated as functions of some intermediate variables. Then the second level approximation is employed to convert the first-level approximation problem into a series of problems of separable forms, which can be solved easily by dual methods with discrete variables. In the second-level approximation, the objective function and the approximate constraints are linearized. The objective of the first-level approximation is to reduce the number of structural analyses required in the optimization problem and the second level approximation reduces the computational cost of the optimization technique. A portal frame and a single layer grid are used as design examples to demonstrate the efficiency of the proposed method.     

Specific Interactions and Contact Angle Measurements on Polymer Solids

The present work examined the susceptibility of contact angle data to specific interactions taking place between solids and contacting liquids. The polymers involved were polystyrene, polyvinyl chloride and polyethylene, representing respectively basic, acidic and neutral substrates. Contacting fluids also were chosen to represent acid and base interaction categories.

Significant time-dependent changes in contact angles were observed when acid/base pairs were involved in the experimental sequence. In specific cases it was possible to identify initial (zero contact time) contact angles, as well as equilibrium values, attained after prolongued contact times. Local solvation, or plasticization, of the polymer by the wetting fluid was postulated as the operative mechanism. The differences between initial and final values of the contact angles were correlated with parameters of specific interaction, calculated from the acceptor/donor numbers for the pertinent materials as measured by inverse gas chromatography. In contrast, when acid/acid or base/base combinations of polymer and wetting fluid were studied, equilibrium values of the contact angle were established rapidly. Since accurate information on acid/base properties of polymers and wetting fluids is not always available, it seems prudent to record contact angles as a function of contact time, and by extrapolation to determine the initial (true) value for further use in surface characterizations of polymers.     

IVS201SH 视野检查系统控制软件实现

VS201SH视野检查系统的软件控制基于Windows平台和VC6．0开发环境,使用了对象建模方法和消息、多线程机制。系统通过人性化的操作界面,实NT高可靠性,强扩展性的医疗视野控制检查功能。该系统实NT盲点、青光眼、黄斑、低视力、区域、阈值等视野检查功能。