西北电网水电参与市场化运营若干问题的研究

随着我国市场化的推进，水电正酝酿逐步参与到电力市场化运营中去。水电参与电力市场竞争，有利于市场的有效性，可以在更大范围内利用市场机制优化资源配置，健全电价机制，优化水能源的利用，更好地为经济社会的协调发展服务。在详细分析西北电网水电参与市场化运营问题的基础上，针对水电的特有规律，提出了相应的建议。     

Dielectric Resonators for the Measurement of Superconductor Thin Films Surface Impedance in Magnetic Fields at High Microwave Frequencies

We present the design and realization of cylindrical dielectric resonators operating in the 40–60 GHz frequency range, designed for the measurement of the surface resistance and of the surface reactance shift in High-T _c Superconductors (HTS) thin films in a dc magnetic field. The resonators are single tone, based on the TE ₀₁₁ mode, and multiple tone, the latter allowing in principle to exploit the simultaneous determination of the surface impedance at different frequencies. As an application example, we report the temperature and field dependencies of the effective surface impedance of some cuprate superconductors thin films. The results are compared with those obtained through the use of a standard metal cavity with a similar Q-factor and operating in the same frequency range. The comparison highlights a superior stability and a higher sensitivity, resulting in an increase of about two orders of magnitude in the resolution of the surface impedance measurement. By contrast, the dissipative part of the superconducting transition (above T/T _c = 0.97) is better studied with the metal cavity. We also present measurements in the vortex state in YBaCa₂Cu₃O_7−δ and Tl₂Ba₂CaCu₂O_8+x that show significantly different physics. PACS: 74.25 Nf.     

基于Client/Server模式的火电厂能损在线监测系统

为了对机组主要设备和系统的运行状态实施在线监测，使机组运行在最佳状态，提高机组的经济性，并加强对能耗指标的管理，而开发了能损在线监测、诊断和能耗指标管理系统，文章对此系统进行了简单的介绍。     

基于B/S的网上教学系统

利用ASP技术与ADO技术,采用Browser/Server模式设计了一个网上教学系统,它包括网上报名、网络课堂、在线答疑和师生信箱.用户可通过交互式动态形式来学习课程内容、进行随机抽取试题、即时打分、查看以往成绩、修改个人信息记录等功能.     

Unconventional Charge Density Wave Arising from Electron–Phonon Interaction

We report of a theoretical study on quasi-one dimensional unconventional charge density wave (UCDW) driven by electron–phonon interaction. Within mean field theory, we find that the wavevector dependence of the coupling leads to a momentum dependent single particle gap on the Fermi surface. The presence of small energy single particle excitations around the gap nodes significantly changes the optical conductivity compared to the conventional CDW result. In addition to that, the collective phase excitation arising from fluctuation of the order parameter leads to further qualitative changes of the conductivity and results in an effective mass that is nonmonotonic in temperature.      

电厂热力系统耗差分析系统实现的研究与发展

总结了电厂热力系统耗差分析几种实现方式，回顾了国内在该领域的发展过程。电厂热力系统耗差分析实现方式分别经历了独立的耗差分析系统、基于DCS的耗差分析系统、基于MIS的耗差分析系统。并在不同的分析方式上进行了评价，指出了耗差分析系统的发展方向。     

自由口通信模式下计算机读写PLC存储区的程序设计

本文介绍了在自由口通信模式下，用计算机读写S7—200PLC存储区内相邻的多个字节数据的通信程序设计方法，程序设计中采用了多种可靠性措施。     

数字多媒体广播技术现状及前景

数字多媒体广播（DMB）是从数字音频广播（DAB）基础上发展起来的一种新型广播技术。数字音频广播是在调幅AM和调频FM之后的第三代广播技术。通过对数字多媒体技术的介绍较全面地阐述了其技术系统、功能、现状及发展前景。     

乙烯装置失效模式分析及基于风险的检验

简述了乙烯装置的工艺流程,分析了装置中常见的几种失效模式及其分布;以乙烯裂解装置为例,简述了RBI的执行过程和结果,从基于风险的检验理念,对制订设备检验策略提出了几点建议。     

沙牌RCC拱坝坝肩稳定三维地质模型试验研究

通过三维地质力学模型试验，研究了沙牌RCC拱坝坝体和坝肩的变形规律、破坏机理，综合评价了坝肩的超载安全度，为工程设计提供依据。