实时数据库在用电信息采集系统中的应用研究

针对我国电力用户数据采集点规模大、采集密集的特点,分析了智能电网建设中用电信息采集系统对数据库的需求,从系统组成、系统技术架构、数据库部署方案以及建设模式等方面研究了实时/历史数据库在用电信息采集系统中的建设方案。该方案能够保证数据采集的可靠性,提升数据应用的敏捷性,具有即插即用的数据接口通用性、创新性的数据流应用展现以及独特的数据保姆功能。该建设方案的应用可为实施分时电价进行预研,为指导社会科学合理用电提供参考。     

有限元法在贴边岔管结构分析中的应用

以南水北调工程为背景,使用通用有限元软件ADINA对贴边岔管进行结构计算,分析了补强板的宽度和厚度对岔管结构应力的影响,在此基础上,确定合理的补强板宽度和厚度。通过实例工程的计算,说明使用有限元法进行计算可以了解结构的受力全貌,利于选择合理的工程措施。     

Polychlorinated naphthalenes and other chlorinated tricyclic aromatic hydrocarbons emitted from combustion of polyvinylchloride

Chloronaphthalenes (CNs) and phenanthrenes or/and anthracenes (CP/CAs) were detected in the emissions of polyvinylchloride (PVC) combustion at 900 degrees C. The presence of metallic iron, copper, or aluminum increased the formation of highly chlorinated CNs (tri- to octachloro-homologues) in the PVC combustion process. Total levels of CNs and CP/CAs were 40-48 and 76-116 mg/kg PVC, respectively, in the emissions from combustion of PVC with metals. Monochloronaphthalenes, dichloronaphtahlenes, monochlorophenanthrenes, and monochloroanthracenes were the predominant homologues. The other CN homologues were minor combustion byproducts. Detection of CNs in the PVC combustion emissions suggests that CN formation from solid waste incineration is a source of CNs in the environment.     

Study on the dynamic characteristics of a new type externally pressurized spherical gas bearing with slot-orifice double restrictors

This study proposes a new type externally pressurized spherical gas bearing with slot-orifice double restricted restrictors, used in a new type gas gyroscope. Based on the spherical Reynolds equation and cylindrical Reynolds equation, small perturbation theory is employed to analyze the dynamic characteristics of the new type externally pressurized spherical gas bearing. The slot gas film and the spherical film are united by means of compatibility condition and a weak solution formula, based on Galerkin residual method, is erected. The nonlinear coupled weak solution equations are solved with FEM and the dynamic coefficients are obtained. Numerical simulation is operated and the change laws that the dynamic coefficients change with dimensionless perturbation frequency f, eccentricity ratio E_h and other structure parameters are analyzed. This paper provides a reference and preparation for analysis on the dynamic characteristics of the similar gas bearings.     

基于曲流技术的超宽带单极子局部放电检测天线设计

电气设备局部放电是衡量电气设备绝缘性能的重要指标,电气设备发生局部放电过程中会产生超高频(UHF)电磁波信号(频率范围0.3 ～3 GHz),而该UHF信号能量集中于0.5 ～ 1.5 GHz频段.为检测该信号,受到通信上UWB天线广泛使用的单极子贴片天线启发,研发了超宽带单极子贴片天线.该天线主要使用了曲流技术,从而...     

歼击机雷达综合瞄准系统超视距空战中的效能

探讨了在超视距空战中歼击机雷达综合瞄准系统(RLPK)的效能评估方法问题。通过分析雷达综合瞄准系统在超视距空战中的典型工作状态,采用概率分析法提出了效能指标。运用概率论相关知识,分别建立了雷达综合瞄准系统在远距导引阶段、搜索与发现/识别阶段、威胁评估/火力分配阶段、小区搜索/截获/跟踪阶段以及空空导弹制导阶段的效能模型。算例表明:系统的工作周期越短,抗干扰能力越强,系统在超视距空战中的效能越大;目标与火力分配环节对单机单目标空战影响不大,但对单机多目标与多机多目标空战影响较大。     

AIS在军事上的应用研究

AIS在民用导航领域已经获得了广泛的应用,在军事领域的应用前景有待研究.为此,在详细分析AIS中可用信息的基础上,探讨了将AIS信息应用于目标识别、雷达精度标定和地渡雷达使用规律分析的实现方法.实际应用结果表明,将AIS应用于军事完全可行,并可发挥显著的军事经济效益.     

变流量水系统中水力平衡问题的探讨

分别从静态水力平衡、动态水力平衡角度分析了静态水力平衡阀、自力式流量控制阀、自力式压差控制阀与电动调节阀组合使用的特性,认为自力式流量控制阀与电动调节阀组合不适合应用在变流量水系统中.     

Evaluation of the surface physical properties of β-tricalcium phosphate/silicone rubber, a prospective soft-tissue implant material

Silicone rubber (SR) is one of the most commonly used and effective implant materials for soft-tissue augmentation, but it has been implicated in many adverse reactions. To overcome this drawback, a novel composite β-tricalcium phosphate/silicone rubber (β-TCP/SR) was prepared by compounding a SR matrix with β-TCP. The surface physical properties of β-TCP/SR were evaluated. AFM images showed that β-TCP/SR exhibited greater surface roughness than SR. The XRD and XPS analyses revealed that the addition of β-TCP changed the surface microstructure and charge distribution. FTIR analysis showed that the interaction between β-TCP and SR was weak, which may be due to the tetrahedral structure of PO₄³⁻. These results suggest that the addition of β-TCP in a SR matrix can change the surface microstructure and may improve cytocompatibility, consistent with results from a previous study.     

纳米氧化铝浆料制备及在水性木器漆中的应用

以钛酸酯为表面改性剂,聚羧酸钠盐为分散剂,采用超声分散法制备了一种平均粒径84 nm、贮存稳定性达60天以上的纳米氧化铝浆料.通过对悬浮体系Zata电位和吸光度的测定,讨论了不同pH值、分散剂、偶联剂及用量对悬浮液稳定性的影响.激光散射粒度分析仪测试及透射电镜(TEM)观察都表明:纳米氧化铝在体系中分散效果良好.将制备的浆料加入水性木器漆中,可以明显提高漆膜的硬度.