超细WC／Co粉末及其烧结体的制备与表征

以水合肼为还原剂,于液相中制得超细we／co硬质合金包覆粉,后处理并进行低压烧结,制得力学性能良好的WC／Co硬质合金烧结体。考察了反应体系温度对反应时间的影响,搅拌速度对包覆率的影响,采用SEM、TEM、EDS等手段对包覆粉进行了表征;对比了不同规格、不同烧结方法对WC／Co烧结体力学性能的影响,采用金相、被散等照片对烧结体进行表征,并最终确定了制备WC／CO包覆粉及其烧结体的优化工艺条件。结果表明：此方法制得的WC／Co包覆粉纯度高,粒径均匀,低压烧结后所得烧结体力学性能良好。     

丙烯酸酯乳液聚合稳定性的研究

本文对丙烯酸酯乳液的聚合稳定性进行了研究,讨论了乳化剂用量、配比、引发剂用量及功能单体对聚合稳定性的影响。     

一个全特性软件通信架构核心框架的实现

介绍了一个全特性的软件通信架构(Software Communication Architecture,SCA)核心框架（Core Framework,CF)C 语言实现。还对在实现过程中发现的一些SCA架构相关的问题进行了简单的讨论。     

无线自组网路由协议研究

分析了当前无线自组网路由协议所面临的问题与挑战,对主动路由和按需路由中的几种代表性路由协议进行了介绍。给出了无线自组网路由协议应满足的7点需求,并在此基础上,对所介绍的路由协议进行了比较。对无线自组网路由协议的具体实现技术进行了探讨,分析了在OSI参考模型的第二层和第三层实现无线自纰网路由协议的优点和缺点。     

IPFIX网络流量分析技术研究与系统设计

流量分析技术是网络管理的重要组成部分,为网络管理提供数据支撑.描述了基于流的IP流导出标准IPFIX(IP Flow Information eXport)的工作原理,分析了IPFIX流形成与处理的整个过程,并对流量分析系统结构进行研究设计.针对分析器可能产生的性能瓶颈问题,提出两点解决方案,并描述了收集器负载均衡的实现方法.     

复合型软岩中大断面硐室联合支护技术应用

平煤六矿是一个年产350万t的大型现代化矿井,共分四个采区,各采区均有两条运输上(下)山及相应的皮带硐室和绞车硐室,属于永久硐室。各硐室均采用传统的锚喷支护,在使     

Tuberculous abscess of the brachialis and biceps brachii muscles without osseous involvement. A case report

In July 1997 Professor Harry Rilbe passed away at the age of 84. Harry Rilbe was an outstanding personality skilled in chemistry, optics and mathematics, and he will be remembered for his important contributions to the development of separation methods, notably moving boundary electrophoresis and isoelectric focusing. The latter method is used for analytical and preparative purposes in thousands of laboratories worldwide. Isoelectric focusing is indispensable for characterization of proteins from humans, animals, plants and microorganisms. Isoelectric focusing is thus useful for the understanding of the function of genes and, accordingly, for progress in the life sciences. A biographical retrospect, "A scientific life with chemistry, optics and mathematics", was published by Harry Rilbe in Electrophoresis 1984, 5, 1-17.     

Uniaxial tensile properties of TiO2 coated single wool fibers by sol‐gel method: The effect of heat treatment

Single wool fibers were coated with TiO₂ by using the sol‐gel method. The uniaxial tensile properties of TiO₂ coated single wool fibers heated at different temperatures from 25 to 200°C were investigated and compared with those of uncoated single wool fibers. It was observed that the shape of the stress–strain curve of TiO₂ coated wool fibers became the same as uncoated wool fibers and showed a similar tendency of change to uncoated wool fibers with increasing temperature. But, the TiO₂ coated wool fibers obtained higher rigidity than uncoated wool fibers and up to their rupture points; they obtained higher stress levels in three deformation regions in the stress–strain curves, which indicates stronger wool fibers. Although the breaking extension of TiO₂ coated wool fibers decreased little by about 8%, the Young's modulus of TiO₂ coated wool fibers increased significantly by 19%, which was caused mostly by an increment in the stiffness of the cuticle layer of the wool fiber, and remained relatively higher than that of uncoated wool fibers after heat treatments. Structural changes in both uncoated and TiO₂ coated single wool fibers due to thermal effect, which caused the changes in the uniaxial tensile properties and the thermal behaviors of these fibers were discussed by using spectroscopic and thermal analysis methods in detail. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 898‐907, 2013     

基于Ad hoc网络的联合有效用户识别与信道安全编译码方法

Ad hoc网络是一种无中心的自组织网络,由于用户能量受限当信噪比较低时有效用户识别的可靠性和信道安全性下降。该文针对这个问题提出一种联合有效用户识别与信道安全编译码方法。将发送用户的正交地址码与接收用户的伪随机地址码异或产生基于发送用户与接收用户的有效用户识别码。为提高信道安全性以信道安全码作为密钥加密有效用户识别码得到正交随机安全序列。为实现扩频并提高传输效率将发送数据以6 bit信息作为一个符号进行分组,将每个符号与一个正交随机安全序列对应。接收用户采用基于子空间的方法处理接收信号,通过建立判决模型识别有效用户。实验结果表明该方法与已有方法相比,当有效用户识别的漏警概率为10^–3时信噪比增益改善1.6 dB。