房山区西太平村草场资源与畜牧业发展

在实地调研的基础上,对北京房山区西太平村的草场类型及其特点进行了分析,并对该村畜牧业发展应遵循的指导思想,以及具体发展途径作了比较全面的探讨。     

声波团聚微粒技术的进展与分析

传统的旋风分离器很难捕集５～１０ｕｍ以下的微粒，目前正在研究微粒声波团聚强化旋风分离技术，以期解决此问题，文中综合论述了国内外声波团聚方面经典的和现代的理论分析及实验方法，通过对冷态下声波团聚微粒的实验，得出了一些有益的结果。     

Low Sulfur Low Olefin Gasoline Production by RIDOS Technology

1Worldwidetrendsingasolinespecifica tions　Anincreasingdemandexistsinthelasttwodecadesforau tomotivefuels .Fuelquality (fuelreformulation)andengineefficiencyhaveconstantlybeenimproved .Themostsignifi cantchangewastheeliminationofleadingasolineinanum berofcountries ,includingChina .Progressivelystrongerregulationshavebeenenactedbymanycountriestoreducetheemissionsfromtransportationengines .Experimentaldatashowthatreducingsulfurandolefincontentingasolinemaybeoneofthebestwaystoimproveautomobileem…     

Non-gyroscope DR and adaptive information fusion algorithm used in GPS/DR device

1 .INTRODUCTIONWith the development of intelligent transport sys-tem(ITS) ,the real-ti me navigation is being givenmore and more attention. One of the key technolo-gies in vehicle navigationis to get the vehicles’po-sition continuously and accurately . Nowadays ,most of the vehicle position devices in use employGPS. However , the satellite signal is frequentlyscreened or disturbed when vehicles running amonghigh buildings , in tunnels or under viaducts ,which makes GPS receiver unable…     

关于工程造价咨询职业责任的思考

文章对工程造价咨询业的职业性质、造价工程师和工程造价咨询单位的职业责任进行了探讨，提出了只有对其加以明确的法律界定，才能进一步规范行业并开展职业保险制度。     

A DYNAMIC APPROACH TO CALCULATE SHADOW PRICES OF WATER RESOURCES FOR NINE MAJOR RIVERS IN CHINA

China is experienciug from serious water issues. There are many differences among the Nine Major Rivers basins of China in the construction of dikes, reservoirs, floodgates, flood discharge projects, flood diversion projects, water ecological constructions, water conservancy management, etc. The shadow prices of water resources for Nine Major Rivers can provide suggestions to the Chinese goverument. This article develops a dynamic shadow prices approach based on a multipeziod input-output optimizing model. Unlike previous approaches, the new model is based on the dynamic computable general equilibrium （DCGE） model to solve the problem of marginal long-term prices of water resources. First, definitions and algorithms of DCGE are elaborated. Second, the results of shadow prices of water resources for Nine Major Rivers in 1949-2050 in China using the National Water Conservancy input-holdiug-out in table for Nine Major Rivers in 1999 are listed. A conclusion of this article is that the shadow prices of water resources for Nine Major Rivers are largely based on the extent of scarcity. Selling prices of water resources should be revised via the usage of parameters representing shadow prices.     

外文图书采购及利用的思考

本文对外文图书从采购到最终利用的整个流程进行了分析和探讨,并指出外文图书利用率的提高需要图书馆加强对其利用的策略研究。     

高速公路建设管理系统应用

本文介绍了高速公路建设过程中采用的管理系统软件,说明了这种软件的优点和可靠性。     

Language Competence and Performance in ELT

The Definition of Language Competence and PerformanceA distinction introduced by Chomsky into linguistic theorybut of wider application,competence refers to a speaker'sknowledge of his language as manifest in his ability to produceand to understand a theo…     

第八届国际环境岩土工程大会一号通知会议主题：基础工程建设与环境

第八届国际环境岩土工程大会是由国际环境岩土工程协会（ISEG）每二年举行一次的系列会议。本次会议将于2006年9月11～15日在尼日利亚首都阿布佳的喜来顿大酒店会议中心举行。会议面向广大来自基础工程建没、土木工程、岩土工程、地质工程、环境工程、能源工程、环境政策等方面的专家学者，也欢迎所有来自政府部门、经济界、石油化工、农业、交通运输等各个领域的感兴趣人士参加。