杭-宁输气管道工程定向钻穿越设计浅析

杭州-宁波天然气输气管道工程（简称杭-宁输气管道工程）是浙江省天然气长输管网主干线之一，根据工程河流穿越众多、渠塘穿越频繁的特点，对杭-宁输气管道工程水域穿越的特点和穿越方式作了总结；重点分析了水域定向钻穿越设计及需要注意的问题，为今后浙江省天然气管网建设的水域穿越设计作了探讨。     

山西省水文数据库的建设与结构分析

文中通过对山西省水文数据库建设的回顾，分析了数据库的库表结构及相关内容，并对今后数据库的建设工作提出了建议和展望。     

WiMAX系统中载波与采样钟同步的研究

IEEE802．16协议采用的OFDMA技术提供了两种子信道使用方式，分别为FUSC和PUSC，结合FUSC的固有结构特点，对导频配置方法和采样钟同步算法进行更深入的忱化。提出了一种更精确的载波和采样钟同步方案。仿真结果表明，此方案所得到的载波同步估计值比普通算法更加准确，同步性能也随之有了很大的改善。     

Intermittent Phenomena in Switched Systems With High Coupling Strengths

In this paper, one kind of intermittency generated by a discontinuous system is studied. Although this system, which is composed of two switched subsystems coupled with a high strength, is nonsmooth, the mechanism of this kind of intermittency can be analyzed with several explicit relations between the intermittency characteristics and the system control parameters. In particular, estimates of "steady-state" values of the system (in the laminar phases) and a critical value for this intermittency can be derived, which are helpful in relevant control systems design. Moreover, some power laws for the observed intermittency are obtained and discussed     

陶瓷行业推行ISO14000探析

大力推行ISO14000系列标准已成为我国陶瓷企业适应加入WTO后新的竞争形式，参与国际绿色贸易的有力武器。本文根据我国陶瓷企业的现状，分析了在陶瓷行业推行ISO14000系列标准工作中所存在的问题，提出了在我国陶瓷行业广泛推行ISO14000系列标准的对策和建议。     

陶瓷企业管理信息系统的应用

通过分析陶瓷企业现状和需求，提出实施管理信息系统的框架结构和必要条件。     

液化气铜片腐蚀原因及解决措施

本文就引起液化石油气（LPG）铜片腐蚀不合格的原因进行了分析，对JX－1A精脱硫剂工业应用效果进行了探讨，结果表明JX－1A精脱硫剂在解决了LPG铜片腐蚀不合格方面有很好的效果。     

25mm厚钢板产生层间撕裂的原因和防治

层间撕裂并非是厚板独有的质量问题 ,结合工程实例 ,分析 2 5mm厚低合金钢板产生层间撕裂的原因。通过对钢材的超声波探伤检测、化学成分分析和Z向性能检测 ,指出层间撕裂主要与节点设计不当和钢材内非金属夹杂物偏析、分层有关 ,并提出了预防措施。对产生裂纹的构件视严重情况提出了不同的修补处理方法     

膜-粉末炭反应器净化微污染源水

采用膜-粉末炭反应器处理微污染源水的试验结果表明,该工艺对水中的有机物具有较好的净化效果,在水温《10℃的条件下,处理可生化性很低的三家店水库水时对CODMn的去除率仍保持在65%左右;工艺对CODMn、UV254、UV410的去除效果依次增强.     

Vibration control of a flexible structure using a hybrid mount

This paper presents vibration control of a flexible beam structure using a hybrid mount which consists of elastic rubber and piezoelectric stack actuator. After identifying stiffness and damping properties of the rubber and piezoelectric elements, a mechanical model of the hybrid mount is established. The mount model is then incorporated with the beam structure, and the governing equation of motion is obtained in a state space. A sliding mode controller is designed in order to actively attenuate the vibration of the beam structure subjected to high-frequency and small magnitude excitations. The controller is experimentally realized and measured control responses such as acceleration of the beam structure and force transmission through the hybrid mount are evaluated and presented in both frequency and time domains.