GSM/WCDMA双模手机测试系统PC部分的软件设计

着重介绍了GSM/WCDMA双模手机测试软件(DOLLY)PC部分的设计,详细描述了该软件PC端的相关线程,并对各线程之间的数据交换方式作了说明.该软件用于手机待机状态(idle mode)的信号测试,项目已进入系统调试阶段,与以往的测试方法和手段相比,其测试性能得到了较大的提高.     

An addendum to “Numerical modeling of an enhanced very earlytime electromagnetic (VETEM) prototype system”

For original paper see Cui et al. (IEEE Antennas and Propagation Magazine, vol.42, no.2, p.17-27, 2000 April). Cui et al. proposed two numerical models to simulate an enhanced very early time electromagnetic (VETEM) prototype system, used for buried-object detection and environmental problems. In the first model, the transmitting and receiving loop antennas were accurately analyzed using the method of moments (MoM), and then conjugate gradient (CG) methods with the fast Fourier transform (FFT) were utilized to investigate the scattering from buried conducting plates. In the second model, two magnetic dipoles were used to replace the transmitter and receiver, because the working frequency for the VETEM system is usually low. Both the theory and formulation were correct, and the simulation results for the primary magnetic field and the reflected magnetic field were accurate. We have compared the simulation results for the magnetic field reflected by a wire-conductor mesh on the ground with measured data. They fit very well. However, the scattered magnetic fields in the simulation results were inaccurate, because we did not use a sufficient number of iterations in the CG-FFT algorithm when the frequency was very low     

工程造价文件编制的几点心得

1 加强专业知识学习,提高自身业务素质 工程造价文件的编制工作是一项政策性、经济性、技术性和专业性很强的工作,造价文件编制质量的优劣直接反映了设计单位的整体水平.因此,无论是工程设计人员,还是工程造价人员,都应重视工程造价方面知识的学习和积累,及时了解国家及省市的各项有关法律法规、相关知识,学习掌握各专业知识,熟悉施工工艺,定期参加各种专业的培训学习,掌握学习我国就WTO达成双边协议工程咨询技术、法规、管理体系及发展方向.     

演艺灯光设计中应防三大危险

指出了演艺灯光设计中在电气系统、防火和建筑防塌方面存在的隐患,对供电可靠性、变压器的连接组别、谐波、静电、防雷、配电设备的选择、线路敷设、主舞台及观众厅火灾探测器的选择和安装等问题进行论述.     

A preliminary evaluation of a continuous‐flow reactor for liquid–liquid–solid phase‐transfer catalyzed synthesis of n‐butyl phenyl ether

This study evaluates the feasibility of using a continuous‐flow stirred vessel reactor (CFSVR) to synthesize n‐butyl phenyl ether (ROPh) from n‐butyl bromide (RBr) and sodium phenolate (NaOPh) by liquid–liquid–solid phase‐transfer catalysis (triphase catalysis). The factors affecting the preparation of triphase catalysts, the etherification reaction in a batch reactor, and the performance in a CFSVR were investigated. The kinetic study with a batch reactor indicated that when the initial concentration of NaOPh or RBr was high, the conversion of RBr would depend on the initial concentration of both RBr and NaOPh. The reaction can be represented by a pseudo‐first‐order kinetic model when the concentration of NaOPh is in proper excess to that of RBr, and the apparent activation energy is 87.8 kJ mol^?1. When the etherification reaction was carried out in the CFSVR, the catalyst particles did not flow out of the reactor, even at a high agitation speed. The conversion of RBr in the CFSVR was, as predicted, lower than that in the batch reactor, but was higher than the theoretical value because the dispersed phase is not completely mixed. Copyright © 2004 Society of Chemical Industry     

锅炉烟道气注采工艺装置安全控制系统

锅炉烟道气注入地层采油地面工艺装置既能有效地提高对粘稠原油的采收率，又使原来作为废气的烟道气再利用，为确保该装置整个工艺流程运行时的可靠性及操作人员、设备的安全。采用PLC控制系统发出指令自动完成。     

Effect of synthesis method on the physical and catalytic property of nanosized NiO

Nanosized NiO material was prepared by four different methods. Their physicochemical properties were investigated through SEM, BET, XRD and O₂-TPD characterization. The results indicated that NiO nanoparticles synthesized by different methods have variant diameters, shape and distribution. And the particles size and surface area influence the adsorptive and catalytic property. Therein nanosized NiO prepared by sol-gel method exhibits strong adsorptive property and good low temperature catalytic behavior.