冶金机械齿轮传动装置的制造技术与发展趋势

介绍当今冶金机械齿轮传动装置制造技术水平,以及大型齿轮传动装置齿轮制造工艺参数选择,从中探索研究冶金机械齿轮传动装置发展趋势.     

STUDY ON GIS BASED PREDICTION SYSTEM FOR RADIO WAVE PROPAGATION IN UBAN REGION

In this letter, an integrated application of the prediction for radio wave propagation with the Geographic Information System (GIS) is presented and a real prediction system based on GIS is implemented.     

未来十年综合航电系统的发展趋向

本文主要阐述未来十年国外综合航电系统的总的发展趋向，重点介绍了在开放式系统结构的研究与应用、采用COTS技术、模块化、多传感器综合技术等方面的发展趋向。     

集成压裂机组研制

针对我国油田特定区决施工特点，通过对油田现用设备使用情况的分析和具体区决施工参数的统计，提出了集成压裂机组研制内容和配置，研制开发了集成压裂机组。产品结合了2000型压裂泵输出功率大、压力和排量覆盖范围合理的条件，集成了压裂车、混砂车、管汇车和仪表车的功能，实现了单台设备完成试压、压裂、酸化、防砂等多种施工流程，改变了常规施工作业设备种类和人员多、操作指挥复杂的施工模式，为油田提供了适合工艺要求的设备。     

一种新型针刺延期药的研制及其应用

本文介绍了一种新型的针刺延期药的配方设计和制备工艺，这种低猛度高热量的针刺延期药具有较高的发火感度，可满足一定的延期时间和相容性要求。文中还介绍了它在几种小型针刺延期雷管中的应用。     

自蔓延高温合成表面涂层技术进展

介绍了自蔓延高温合成技术用于表面涂层的SHS熔铸涂层、SHS气相传输涂层、SHS铸渗涂层、SHS烧结涂层、SHS喷射沉积涂层和自反应涂层技术的原理、应用和发展 ,并指出了存在的问题     

王怀臣谈四川水电开发

四川水电取得了长足的发展,要坚定不移地发展水电产业,不断完善水电产业发展的机制,抓好移民安置,正确处理好四个关系。     

灰色预测法在西安市农村电话预测中的应用

在对西安市农村电话发展现状分析的基础上 ,运用灰色预测法对西安市农村电话未来发展趋势进行预测 ,为制定西安市农村电话发展策略提供参考     

Investigation of Boundary Shear Stress and Pollutant Detachment from Impervious Surface during Simulated Urban Storm Runoff

Pollutant detachment rates have been determined for four chloride salts during simulated urban storm runoff. Under rainfall and/or overland flow conditions, chloride mass flux was measured and related to boundary shear stress of the test surface. Washoff coefficients, presumed to depend only on pollutant characteristics, were computed based on the slopes of dimensionless mass flux versus dimensionless time plots. Washoff coefficients were found to vary among and between the chloride compounds studied. In general, higher overland flow rates produced lower boundary shear and lower washoff coefficients. The combination of simulated rainfall and overland flow resulted in an increased boundary shear and an increased washoff coefficient. An empirical washoff coefficient based on a load characteristic curve derived from an exponential washoff relationship was also computed from the runoff data and compared with the previous washoff coefficient. A linear correlation between these two washoff coefficients was observed. The magnitude of the latter coefficient under simulated rainfall was consistent with reported values obtained from field data.     

Sicherer und wirtschaftlicher Betrieb von Kraftwerken – Ergebnis der Forschung im Bereich Werkstoffe,Auslegung und Instandhaltung

Safe and Economic Operation of Power Plants – Research Results in the Field of Materials, Design and Maintenance Components of power plants which undergo high temperatures are subjected to complex loading situations. The requirements on the used materials result from the special operation conditions of the plants and have to be adjusted to the steadily growing requirements on higher efficiency of the complete power plant as well as to those of safe and economic operation. The expenses for control and downtimes are directly connected with economic efficiency and availability. However, in case of new procedures or components it is not possible to revert to the existing know‐how. Different failure mechanisms than known before can occur. The same goes for the load situation. Therefore the knowledge base has to be extended to in‐advance or even parallely running scientific examinations that life assessment and maintenance strategies can be applied which guarantee the operational reliability and the efficiency of the plant. The main emphasis of these F&E works has to be put on condition monitoring based on actual operational data, the standard materials’ and component’s behaviour (deformation, damage and failure behaviour) in connection with design of components and the related material laws. In the framework of applied AVIF projects, following problems are handled:. – qualification of materials by determinating parameters related to practise. – optimal design of components by making available material laws and numerical tools. – economic manufacturing of components by qualifying processing methods such as welding. – The results can be transferred to concepts for safe and economic operation of power plants, especially for newly introduced materials for which there is no operational experience available.