GSM网络优化分析

简单叙述了GSM网络优化基本流程,从网络硬件问题的排查与整改、整体或部分网络的DT测试、网络统计单元的统计与分析、用户投诉的收集与分析处理4个方面介绍了GSM网络优化的基本方法。重点介绍了网络DT测试和话统分析的相关操作方法和注意事项,并且针对与之相关的指标异常问题,有针对性地给出了相应的解决措施。     

血管活性肠肽的固相合成及其体外抗菌活性研究

采用Na-芴甲氧羰基（FMOC）作为α-氨基的保护基,以逐个延伸的固相合成法合成了血管活性肠肽,以最小抑菌浓度（MIC）评价其体外抗菌活性。高效液相色谱和质谱分析表明,所合成的血管活性肠肽的纯度为95.2%,相对分子质量为3326.5。血管活性肠肽对几种革兰氏阳性菌和革兰氏阴性菌有不同程度的抑制活性,其中对E.coli和P.aeruginosa的抑制效果最好。     

新型VIP低能耗建筑的特色

介绍德国新型的VIP低能耗建筑;讨论其经济性方面的优势;分析此类低能耗建筑的外部造型、内部情趣空间质量与其经济性、能耗之间的关系;希望VIP建筑能为我国北方采暖区低能耗建筑的发展提供借鉴。     

基于正则式的维普网全自动包装器的实现

当数据源的查询和访问受到限制时,网页包装器的设计与实现有一些新的特点。分析了维普网页的结构,描述了网页元素的标记与内容特征,给出了一组匹配维普网页内容的正则式,并用VisualC#实现了一个包装器,同时指出了实现技术中的要点与难点。实际应用表明,该文实现的全自动包装器可以精确抽取维普网页的全部检索内容。     

对箱壁式冰箱使用真空隔热板的分析

介绍了一种真空隔热板(VIP)导热系数的测试方法;利用有限元方法对使用VIP的箱壁式电冰箱冷凝器的换热进行了计算和分析。在模拟分析中,考虑了冷凝管的材料和铝箔对传热的影响。实验测试结果证明了该测试方法在工程上是有效的。计算结果显示,相对于完全用硬质聚氨酯泡沫作为保温材料的冰箱,VIP冰箱有明显的隔热保温效果:采用导热系数为2.5mW.m-2K-1的VIP,渗入热可以减少57.8%,同时冷凝器向箱体外壁的传热量可以增大1.4%。通过铝箔传出的冷凝热在8%左右;冷凝器的管材对换热效果影响不大,采用铜管比钢管的换热效果增大不到1%。     

Vacuum insulated panels for sustainable buildings: a review of research and applications

New research has identified vacuum insulation panels (VIPs) as highly efficient insulators for use in building construction. They are reported to be several times more effective than conventional materials of a similar thickness in terms of thermal conductivity. Because of their smaller space requirement, VIPs maximize the internal usage area of buildings and so reduce the cost of construction. There are however some obstacles that have hindered the application of VIPs, notably their high cost, susceptibility to perforation and the long‐term water and gas effects that worsen their performance. This paper reviews the contemporary research on VIP as a state‐of‐the‐art material for building insulation. The main components and physical principles of VIP performance are discussed. Finally, the review of VIPs available on the market and their performance is provided. © 2013 The Authors. International Journal of Energy Research published by John Wiley & Sons, Ltd.     

Vacuum insulation panels—From research to market

Vacuum insulation panels (VIPs) have a thermal resistance about a factor of 10 higher than that of equally thick conventional polystyrene boards. Similar to thermos flasks these systems make use of ‘vacuum’ to suppress the heat transfer via gaseous conduction. While thermos flasks are to be pumped down to a high vacuum, filling material integrated in the flat VIP elements, which bears the atmospheric pressure load, reduces the requirements on the vacuum and thus on the tightness of the vacuum casing. Optimal in this respect is a kernel of fumed silica. This kernel is evacuated to below 1 mbar and sealed in a high-barrier laminate, which consists of several layers of Al-coated polyethylene (PE) and polyethylene terephthalate (PET). The laminate is optimized for low air and moisture leakage rates and thus for a long service life. The evacuated silica kernel has a thermal conductivity of about 0.004 W m⁻¹ K⁻¹ at room temperature, mainly resulting from solid thermal conduction along the tenuous silica backbone. As the kernel is nanoporous, the gaseous thermal conductivity becomes noticeable only for pressures above 10 mbar. At about 200 mbar the thermal conductivity measures about 0.008 W m⁻¹ K⁻¹. Such a gas pressure could occur after several decades of usage in a middle European climate. With VIP, slim yet highly insulating façade constructions can be realized. A centre U-value of 0.2 W m⁻² K⁻¹ can be achieved for a VIP thickness of only 2 cm, if optimized kernels and barrier laminates as well as stringent quality control are employed. A successful “self-trial” using VIPs within a façade of the ZAE-building in Würzburg in 1999 was the starting point for new applications of evacuated insulations in the building sector.     

完善怀化电信大客户营销服务体系绩效考核制度刍议

完善大客户的绩效考核制度,是目前电信公司大客户营销服务体系建设的一项重要内容。文章在分析完善电信大客户营销绩效考核制度的现实意义的基础上,剖析了当前电信大客户营销绩效考核制度存在的主要问题,即绩效考核指标复杂、收入全额挂钩考核引起的收入分配差距过大、业务发展分值占比过小、大客户经理职业发展通道不明确等。对此,有针对性地提出了完善电信大客户营销绩效考核制度的思路及对策。     

基于LVS的行情服务器集群的研究与实现

论文讨论如何利用现有的资源,在Linux环境下,使用LVS技术,建立起一套可伸缩性、高可靠性的行情服务器系统,保证网上行情服务的正常运行。目前论文所介绍的行情服务器系统,已经在日常的网上行情服务中得到了应用。     

基于VMT的DDR-SDRAM控制器功能验证

介绍了一种基于验证模型技术(VMT)的DDR-SDRAM控制器的功能验证方案。该方案完成了DDR-SDRAM控制器对DDR-SDRAM模型的读写以及AHB 2.0协议的兼容性验证。VMT的使用加快了验证平台的搭建和验证用例的编写。通过分析自动校对结果、仿真波形和覆盖率报告,实现控制器功能验证的快速收敛。FPGA原型验证进一步证明了该方案的可行性。