基于ASP+SQLServe的桂林12369环保投诉受理系统开发

文章通过对桂林市环境污染投诉管理现状的具体分析,开发建设桂林市12369环保投诉受理系统.系统通过对污染投诉进行分类逐个跟踪及处理的过程和处理的结果过程中产生的信息进行统一管理,为环境管理部门提供一个功能完备的网络化污染投诉数据管理与综合分析应用平台.解决环境投诉管理过程中手工操作繁杂、业务量大、信息查询不便、统计困难等问题,以便及时掌握桂林市各种污染投诉的状况,为各有关部门和领导决策及时提供有力的支持和服务.系统基于B/S模式,采用ASP和MS SQLServer2000数据库结构化开发的应用系统.     

基于PIC＋FPGA飞机直流供电系统设备故障预测研究

针对飞机直流供电系统中直流设备工作情况，本文利用FPGA双进程有限状态机方法控制A／D转换器，快速准确采样多路信号。用模糊理论的建议语言规则，结合PIC单片机的控制优势，从而解决飞机直流供电系统设备故障预测报警。     

钯改性镍基高温合金铝化物涂层的组织和热腐蚀性能

以M38合金作基材，先电镀Pd-20wt%Ni合金，再采用传统低温高活性(LTHA)固渗铝工艺，用NaCl作活性剂渗铝制得Pd-Ni-Al涂层。XRD和EPMA分析结果表明，涂层为固溶Ni的β-PdAl单相结构；在900℃Na     

Ion engine grids: Function,main parameters,issues, configurations,geometries, materials and fabrication methods

Ion optics are crucial components of ion thrusters and the study of the different ion extraction solutions used since the beginning of the electric propulsion era is essential to understand the evolution of ion engines. This work describes ion engine grids' main functions, parameters and issues related to thermal expansion and sputter erosion, and then introduces a review of ion optics used for significant launched and tested ion thrusters since 1970. Configurations, geometries, materials and fabrication methods are analyzed to understand when typical ion thrusters use two or three grids, what are the thicknesses and aperture sizes of the screen, accelerator and decelerator grids, why molybdenum and carbon-based materials such as pyrolytic graphite and carbon–carbon are the best available options for ion optics and what is the manufacturing method for each material.     

高精度温度控制方式述评

对高精度温度控制系统中常用的模拟控制方式、数字控制方式和模拟/数字控制方式作了比较,目的在于找到既能满足计量检定恒温装置所需的技术指标、又方便实用的控制方式.     

新存货计价法对宏观经济的影响

新的《企业会计准则第1号——存货》废除了存货结算的后进先出法，反映了我国会计准则与国际准则的趋同。在我国目前的经济环境下，先进先出法对我国宏观经济具有利好作用，具体表现在以下方面：（1）在物价持续上升时期有助于企业提高价值，增强投资者对我国总体经济走势的信心；（2）在保持企业稳定发展的同时，税收的增加可以充裕财政，加强政府对我国经济的宏观调控；（3）可以真实反映国有企业资产价值，避免国有资产流失。     

A novel approach for predicting inlet pressure of aircraft hydraulic pumps under transient conditions

Cavitation caused by insufficient suction is a major factor that influences the life of aircraft pumps. Currently, pressurizing the tank can solve the cavitation problem under steady large-flow conditions. However, this method is not always effective under transient conditions (from zero flow to full flow in a very short time). Moreover, to apply and design other measures, such as a boost impeller, the suction dynamics during the transient period must be investigated. In this paper, a novel approach based on the pressure wave propagation theory is proposed for predicting the inlet pressure of an aircraft pump under transient conditions. First, a dynamic model of a typical aircraft pump is established in the form of differential equations. Then, the transient flow model of the inlet line is described using momentum and continuity equations, and the governing equations are discretized by the method of characteristics and the finite difference method. The simulated results are in good agreement with the results from verification tests. Further simulation analysis indicates that the wave velocity and transient time may influence the inlet and reservoir pressure as well as the size of the inlet line. Finally, solutions for upgrading the inlet pressure are discussed. These solutions provide guidelines for designing inlet installations.     

新型环氧树脂潜伏性促进剂的合成、表征及性能研究

合成了新型环氧树脂潜伏性促进剂三(乙酰乙酸十八酯)铝,采用DSC,FT-IR,H-NMR、元素分析分别对其热分解机理、化学结构、物质纯度进行了表征.研究了以环氧ZH92-21∶双酚S∶三(乙酰乙酸十八酯)铝=l00∶3∶0.5为配比的树脂体系的固化制度、潜伏性和力学性能,树脂体系的表观粘度在室温储藏7个月后基本没有变化,相分离是其具有优异潜伏性的主要原因.     

弹道跟踪数据野值剔除方法性能分析

弹道跟踪数据中的野值会影响导弹目标定位精度。对用于弹道跟踪数据的野值剔除方法进行了综述。结合事后和实时两大类处理模式,分析了各野值剔除方法在理论和工程应用上的优缺点,给出了实际应用时的限制因素,建立了野值判决准则和相应的野值剔除实现步骤。仿真结果表明:野值剔除方法可以有效提高弹道跟踪数据的精度。事后处理模式中,基于格拉布斯准则的野值剔除效果最佳;实时处理模式中,基于自适应门限的五点线性预报法野值剔除效果相对较好,且时间复杂度相对较低,适合实时处理。     

美国空间快响小卫星载荷技术现状与分析

为保障未来战争中能及时补充和维护失效军用卫星,美国正在全面推进空间快速响应(ORS)小卫星计划。该计划主要围绕低成本、灵活性、快速响应能力发展。简述美军的ORS计划发展现状,指出其在2025年前的ORS技术预测,分析ORS侦察小卫星有效载荷技术。