摘要：Structural analysis of steel frames is typically performed using beam elements. Since these elements are unable to explicitly capture the local buckling behavior of steel cross-sections, traditional steel design specifications use the concept of cross-section classification to determine the extent to which the strength and deformation capacity of a cross-section are affected by local buckling. The use of plastic design methods are restricted to Class 1 cross-sections, which possess sufficient rotation capacity for plastic hinges to develop and a collapse mechanism to form. Local buckling prevents the development of plastic hinges with such rotation capacity for cross-sections of higher classes and, unless computationally demanding shell elements are used, elastic analysis is required. However, this article demonstrates that local buckling can be mimicked effectively in beam elements by incorporating the continuous strength method (CSM) strain limits into the analysis. Furthermore, by performing an advanced analysis that accounts for both geometric and material nonlinearities, no additional design checks are required. The positive influence of the strain hardening observed in stocky cross-sections can also be harnessed, provided a suitably accurate stress–strain relationship is adopted;a quad-linear material model for hot-rolled steels is described for this purpose. The CSM strain limits allow cross-sections of all slenderness to be analyzed in a consistent advanced analysis framework and to benefit from the appropriate level of load redistribution. The proposed approach is applied herein to individual members, continuous beams, and frames, and is shown to bring significant benefits in terms of accuracy and consistency over current steel design specifications.

摘要：This paper presents the Taguchi Method, a statistical design modelling for experiments applied in environmental engineering. This method was applied to optimize the treatment conditions of polyester-resin effluent by means of advanced Oxidative Processes (AOPs) using chemical oxygen demand (COD) as response parameter. The influence of each independent parameter including respective interactions was evaluated by Taguchi Method, which allowed determining the most statistically significant variables and conditions to best fit the process. Results showed that Taguchi Method is a very useful tool for environmental engineering field and possible simplifications of analysis and calculations through commercially available software.

摘要：针对标准advanced TCA架构管理系统在某些特殊领域存在成本高,功能冗余等缺点,提出了一种基于ARM的实用advanced TCA智能管理系统设计方案;以32位ARM嵌入式微处理器为核心,采用实时操作系统μC/OS-II,在符合PICMG3.0规范基本要求的前提下,通过简化advanced TCA构架的管理协议以及合理的硬件电路设计,实现高效、低成本的advanced TCA智能管理系统;为了有效地管理advanced TCA构架,给出了一个智能管理软件的设计方案;通过实际应用,系统能有效地对advanced TCA构架的运行情况进行管理监控,验证了系统的可行性;另外,该系统的研发风险与难度较低,具有较强的实用性。

摘要：针对高级加密标准(AES)S-盒优化,提出了一种新的多因子公共项消除(CSE)优化算法.多因子CSE算法通过对组合逻辑表达式中所含因子最多的公共项优先消除,以简化逻辑表达式,从而有效地减少S-盒电路结构中的GF(2^4)域乘法逆电路和映射矩阵电路的面积和时延.结果表明,多因子CSE算法具有计算速度快,优化效率高的特点.优化后的S-盒组合逻辑电路采用0.18μm CMOS工艺,设计出的S-盒面积-延时积比目前最小面积和最短延时的S-盒组合逻辑电路分别减少了10.32%和19.64%.

摘要：全超导托卡马克系统不同于常规托卡马克系统,有独特的运行特性和更高的运行风险。安全巡检与联锁保护系统是托卡马克系统中必不可少的一个重要组成部分。EAST(Experimental advanced Superconducting Tokamak)是我国自主研发的世界上第一个全超导托卡马克系统。本文详细分析了EAST的主要运行风险,针对运行风险制定的各子系统的安全监测和保护机制,及分布式EAST安全巡检与联锁保护系统的系统体系结构和系统的实现。EAST已在中国科学院等离子体物理研究所建成并于2006年9月运行成功,获得等离子体,本系统已在EAST装置的2006～2007年度的几轮实验中成功应用。

摘要：以一大型烧烤炉上盖的拉伸模设计为例,首先用Pro/E建模并分析落料尺寸和压力中心,然后用先进的CAE软件FASTFORM advanced作为辅助工具,确定模具设计的其它参数,再结合生产实际进行验证。为这类拉伸件的模具提出了一种独特的、先进的基于数字化成形技术的设计方法。

摘要：基于计算流体力学(Computational Fluid Dynamics,CFD)通用计算程序Fluent,研究了模块化熔盐冷却球床堆(Pebble Bed advanced High Temperature Reactor,PB-AHTR)中心热通道稳态热工水力行为。利用已开发的多孔介质流固两相局域非热平衡模型计算了球床堆中的压降、冷却剂的温场分布以及固相球床的温场分布,计算并比较了不同的多孔介质阻力因子(Ergun与KTA)对通道内的冷却剂流动以及温场分布的影响,并对丧失部分冷却剂情况下通道内的冷却剂及燃料温度进行了计算分析。结果表明使用不同的阻力因子对堆芯压降计算结果和流场的分布影响较大;而冷却剂温场及固相球床温场和球心的温度分布在不同的阻力因子下的差别较小,在PB-AHTR的设计参数下堆芯产生的热量能够被有效的输出,设计具有较大的安全裕度。计算结果对于球床堆的优化设计提供了一定的参考价值。

摘要：研究采用小区偏置和时域干扰协调技术的异构网络的频谱效率.首先通过使用泊松点过程来描述基站和用户的空间位置分布,分析异构网络下行性能,如用户连接概率、用户与服务基站的距离分布以及用户和网络频谱效率;然后研究小区偏置值和空白子帧比例对异构网络频谱效率的影响.仿真实验中,通过蒙特卡洛仿真验证理论推导结果的正确性,并给出最大化网络区域频谱效率目标下的最优参数配置,该工作对于实际系统的参数设计具有参考意义.

摘要：为了构建双网传真机,实现传统传真和网络传真功能的集成,介绍了在传统传真模块之上,利用嵌入式ARM硬件平台和网络传真软件构建了一个双网数字传真机设计原型,重点介绍了以邮件服务为中心的网络传真软件系统的架构和实现过程。设计结果符合《IP传真数据非实时传送技术要求》的规定。

摘要：针对两跳OFDMA中继蜂窝网络,提出一种节能比例公平调度方案.根据不同业务类型的时延需求和单位比特能耗等QoS参数来设计业务调度优先级因子,并给出一种高效的资源分配方案.数值仿真结果表明,本文给出的调度方案在保证不同类型业务QoS需求的同时,能有效降低系统能耗,提高系统吞吐量.