解读蓝牙技术

蓝牙是短距离无线通信技术标准。主要介绍了蓝牙技术的基本概念、网络结构、组成、关键技术以及未来的发展趋势。     

Formal Specifications and Verification of a Secure Communication Protocol Model

1 .INTRODUCTIONAlongwiththerapiddevelopmentofthecomputernetwork,theinformationtransferredthroughthenetworkhasbeenontheincrease ,accordingly ,thesecurityofcommunicationhasbecomeapopulartop ic .Communicationprotocol,theessenceofcomputernetworkanddatacommunication ,referstoapropercommunicatingbehaviorcarriedoutbyasetofproto colentitiesundercertaincommunicationrules.Itistheimperfectcommunicationprotocolthatcausestheinsecurityofnetworkcommunication .Inthispaper,asecurecommunicationprotocolmode…     

Study on the Class-Based Admission Control Scheme for DiffServ in MPLS Networks

Differentiated services (DiffServ) and MPLS are two major building blocks for providing multi-class services over IP networks. In order to respond to the need for relatively simple, coarse methods of providing different levels of service for Internet traffic, to support various types of applications and specific business requirements, the MPLS network infrastructure and the DiffServ traffic model will work together. Meanwhile, in today's environment of multiple service networks, it is necessary for the node in the networks to perform the control mechanism to guarantee various QoS. In     

复合材料多层板壳强迫振动的振型叠加解

在文献1(王震鸣．复合材料力学和复合材料结构力学．机械工业出版社，1991)的基础上，介绍了用振型叠加法分析解复合材料多层扁壳的强迫振动的方法，推导出了相应的公式。文中列举了算例，与直接积分法计算结果进行了对比。     

钢板强适应横向冷却曲线

根据能量守恒定律，建立了温度场模型，利用边界条件，求解钢板表面流水冷却的换热系数和冲击射流换热系数，从而获得强适应横向冷却曲线的正确形状，采用同直径集管以及不同密度分布的设计方法，使钢板得到均匀的温度分布，获得平直的板形。     

求解颗粒吸收系数和散射系数的一种新算法

提出一种基于蒙特卡罗方法的求解介质辐射参数中吸收系数和散射系数的新算法，克服了以往的基于Mie理论方法中要求对颗粒进行球形假设这一限制，可直接在实际情况下对介质进行计算，并可以同时比较精确求解出介质的吸收系数和散射系数，这一算法对于煤粉燃烧过程中辐射计算具有一定的实际意义。     

SoC功率管理及其在TD-SCDMA终端基带芯片设计中的应用

介绍了在SoC设计中应用到的功率管理技术。探讨了在电压岛设计中涉及到的几个难点重点问题。结合TD-SCDMA终端基带芯片设计,分析了在电压岛设计各个步骤与普通设计相比需要的改进。在EDA工具的帮助下,该芯片有效地降低了功耗,同时附带减小面积,这为SoC低功耗提供有益的参考。     

强化生化氧化法提纯含酚污水

在用生化氧化法提纯多组分工业污水时，发现尿素能选择性地加速酚的氧化分解。尿素所起的作用，不仅是因为尿素是一种含氮生物活性物，而且还可能因为尿素与酚形成了一各易于氧化的包体化合物。     

Grinding Characteristics Of Directionally Aligned SiC Whisker Wheel - Comparison With A12O3 Fiber Wheel

A unique SiC whisker wheel was invented, in which the whiskers were aligned normally to the grinding wheel surface. In this paper, grindabilities of the SiC whisker wheel are investigated and compared with those of other wheels of SiC grains, Al2O3 grains, as well as Al2O3 long and short fibres which were also aligned normally to the grinding wheel surface, respectively. The main research contents concern grinding characteristics of a directionally aligned SiC whisker wheel such as material-removal volume, wheel-wear rates, integrity of the ground surfaces, grinding ratios and grinding efficiency. Furthermore, grinding wheels of whiskers and fibres have a common disadvantage: they tend to load easily. The authors have proposed a simple method of loading-free grinding to overcome this propensity and investigate some related grinding characteristics under loading-free grinding conditions.     

比较判定法极限形式的简化

比较法判定级数的敛散性,是一种常用的方法。重点阐述了无穷小的比较在级数判定中的应用。