基于安全因素考虑的交通枢纽标识系统设计研究

交通枢纽空间复杂,其标识系统设计首先要考虑安全因素.本文论述了影响交通枢纽空间安全的因素,提出了交通枢纽空间对标识系统的要求,分析了当前标识系统存在的问题,论述了基于安全因素的交通枢纽标识系统的组成及设计原则.最后强调标识设计要以安全性为第一考虑要素.     

Mn对Mg-Zn-Ca-Mn合金显微组织和力学性能的影响

为了研究不同Mn含量对Mg-2Zn-0.5Ca-xMn新型医用镁合金显微组织和力学性能的影响,利用光学显微镜、X射线衍射仪、扫描电镜和电子万能试验机分析Mg-2Zn-0.5Ca-xMn镁合金析出相、热挤压显微组织及力学性能.结果表明:铸态Mg-2Zn-0.5Ca-xMn合金组织主要由α-Mg基体组成,热处理前后第二相成分均为Mg0.97Zn0.03、MgZn2、Mg2Ca及Mn颗粒;Mn以单质形式弥散分布于基体内,细化铸态Mg-2Zn-0.5Ca-xMn合金晶粒,并且阻碍热挤压过程中动态再结晶晶粒长大,使晶粒尺寸随着Mn含量的增加而减小;随着Mn含量的增加,挤压态Mg-2Zn-0.5Ca-xMn合金强度逐渐增加,塑性有所降低.Mn质量分数为1.5%的合金抗拉强度最大,达245MPa;Mn质量分数为0.5%的合金断面收缩率和断后伸长率较大,分别为31%和12.5%.     

Reduction of nonreciprocal errors in a differential interferometric fiber optical gyroscope using optically differential processing

The bias stability of differential interferometric fiber optical gyroscope is analyzed.Thermal error causing long-term bias drift are reduced by putting the 90°splice in the middle of the fiber coil and applying a wide spectrum light source.Also,a kind of novel optical differential processing,which is much more precise than the electronic differential processing,is proposed for reducing the residual nonreciprocal error in the final differential output.An experimental setup based on optical differential processing was built.An~100 fold reduction in the long-term bias drift is demonstrated experimentally compared with the primary differential interferometric fiber optical gyroscope.     

我国研究生培养中"严出"的障碍及对策分析

从我国研究生培养质量控制体系的现状出发,分析了我国研究生培养中"严出"的各种障碍,提出全面贯彻研究生培养"严出"原则的对策,即将培养单位培育成质量控制的有效主体,尽快完成高等教育领域的人事制度、分配制度改革,为研究生培养"严出"奠定制度基础.     

HDPE/iPP/CB吸波复合材料的导电性能和力学性能研究

利用碳黑（CB）在多相聚合物体系各相中的选择性富集现象，制备出了HDPE／iPP／CB二元聚合物基单层吸波复合材料，使导电相（CB富集相HDPE）为吸波相，有效吸收电磁波能量；非导电相iPP为透波相，作为电磁波进入复合材料的通道．导电性能测试表明，所制备的复合材料中具有明显的渗流现象和二次渗流现象，材料中吸波相和非吸波相并存；力学性能测试表明，适量的CB将增强树脂基体的力学性能，而过量的CB使材料的力学性能下降．分析认为，利用CB在多元聚合物中的选择性富集来制备单层吸波复合材料是一种可行的方法．     

Symbol error rate of selection amplify-and-forward relay systems

Cooperative diversity schemes significantly improve the performance of wireless networks by transmitting the same information through several nodes. The amplify-and-forward (AF) relaying method is one of the most attractive cooperative diversity schemes due to its low complexity. Selection AF relaying has recently been proven to achieve the same diversity order as and lower outage probability than all-participate relays. In this letter, we present an asymptotic analysis of the symbol error rates of a selection AF network, and compare it with the conventional all-participate scheme     

中文字库组织与管理技术的研究

介绍了中文大字符集字库管理技术中有关字库的组织、管理及应用相关的内容,讨论了大字符集中字库的组织、数据复用高效管理、点阵绘制快速还原、及在RIP解释器中的应用等若干重要技术问题.     

基于嵌入式技术的信息显示原理演示仪

针对目前国内在信息显示原理教学方面相关实验仪器的空白,本文设计了一种信息显示原理的演示仪。该演示仪以发光二极管为显示屏,以嵌入式微处理器SamsungS3C44BOX为控制核心,采用通用计算机和嵌入式微处理器组成的上位机和下位机架构,其人机交互界面友好,使用方便。经测试证明,该仪器运行可靠。     

武钢2号高炉操作技术优化

武钢2号高炉中修以后，通过采取精料、提高顶压和压差、富氧喷煤等多种强化措施，取得了十分明显的冶炼效果，高炉各项技术经济指标不断进步。     

Transient Rainfall-Runoff Loadings to a Partial Exfiltration System: Implications for Urban Water Quantity and Quality

Modification of rainfall-runoff processes by urban infrastructure and anthropogenic activities impacts receiving waters and the surrounding terrestrial environment. Infiltration–exfiltration systems such as a partial exfiltration reactor (PER) when loaded by transient sheet flow have the potential to attenuate the impact of both the quantity and quality of urban runoff. These in situ systems are subject to highly variable water quality and quantity while functioning under variably saturated flow conditions. To improve the understanding of field-scale PER performance as a rainfall-runoff unit operation and process, a two-dimensional (2D) numerical model was used to simulate the effluent hydrograph and water content profiles under transient hydraulic loadings. Richard’s equation was applied in the 2D model using parameters estimated from laboratory experiments and hydrographs measured for an in situ PER. The temporal dynamics of the water content illustrated the ability of the PER to lower peak flow, redistribute volume, and attenuate temporal aspects of the inflow hydrograph. Results demonstrated the role of the PER to attenuate runoff water quantity, while also providing water quality improvements, as illustrated for suspended solids and dissolved Cu. Simulation of historical events for different surrounding soils illustrated the critical role of surrounding soil conditions on PER performance. While the PER demonstrated water quantity attenuation benefits for design storms (1, 2, 5?year return periods), results also illustrate how a given PER design for clayey soils conditions can be limiting for intense events. Evaporation was a dominant mechanism for the drying process in the PER upper layer; with a residual moisture content in the porous pavement layer achieved in less than 2?days in summer for Cincinnati, Ohio.