CIMS信息集成平台中实例代OO视图的维护方法

为满足CIMS信息集成平台中全局集成级物理集成策略的需求，本文研究了实例化面向对象视图的有效维护问题，提出了一个实例化面向对象视图的有效维护方法．该方法是代数的和基于等价推理的，它使用对象代数作为基本描述语言．本文给出了一个传播基类的更新到实例化OO视图的更新传播算法，证明了该算法是正确的并保持了一定程度的最小性，即它可以确保没有不必要的实例被计算．分析和实验结果表明，大多数情况下改变传递算法都比重新计算视图有效．     

CIMS信息集成平台中实例化OO视图的维护方法

为满足ＣＩＭＳ信息集成平台中全局集成级物理集成策略的需求，本文研究了实例化面向对象视图的有效维护问题，提出了一个实例化面向对象视图的有效维护方法，该方法是代数和基于等价推理的，它使用对象代数夜为基本描述语言，本文给出了一个传播基类的更新到实例化ＯＯ视图的更新传播算法，证明了该算法是正确的并保持了一定程度的最小性，即宁可以确保没有不必要的实例被计算，分析和实验结果表明，大多数情况下改变传递算法都比重     

三元复合驱采出液中硅离子的定量分析

将硅钼黄分光光度法用于三元复合驱采出液中硅离子的定量分析,考察了碱(NaOH)、聚合物(HPAM)、表面活性剂十二烷基苯磺酸钠(LAS)对硅离子定量分析的影响。结果表明,水样中含有的LAS(0~2400 mg/L)和NaOH(0~7200 mg/L)对硅离子的定量分析几乎无影响。高浓度NaOH(>7200 mg/L)对测定的影响可以用盐酸消除。在pH值为1.2、高分子量HPAM(M=3500万)加量为0~80 mg/L时,随着HPAM浓度增加,溶液吸光度增大。这一影响不能通过加入1 mL丙酮消除,但可用蒸馏水稀释消除。低分子量(M=300万)、低浓度(0~40mg/L)聚合物几乎不影响硅离子测定。该法可准确、快速地分析三元复合驱采出液中的硅离子含量,标准曲线的线性回归方程为:A=0.0145c,相关系数R~2为0.9996,线性范围0~20 mg/L,测定的准确度大于98%,相对标准偏差1.39%,重现性较好。图1表5参4     

EDTA interfacial chelation Ca2+incorporates superhydrophobic coating for scaling inhibition of CaCO3 in petroleum industry

In this paper,the superhydrophobic poly(vinylidene fluoride)/fluorinated ethylene propylene/SiO2/CNTs-EDTA(PFSC-EDTA)composite coating was successfully fabricat...     

The SOI DAWN process for three-dimensional silicon micromachining and its applications

A DRIE assisted wet anisotropic bulk micromachining (DAWN) process is demonstrated to fabricate various three-dimensional MEMS devices on a silicon-on-insulator (SOI) wafer. This SOI DAWN process can realize thin film structures, reinforced (thin film) structures, and thick structures with totally different mechanical characteristics. Various passive and active mechanical components, including flexible springs, rigid structures, and actuators, have been fabricated using the SOI DAWN process and have been further integrated to create MEMS devices which are flexible as well as movable in both in-plane and out-of-plane directions. This SOI DAWN process has been successfully applied to produce various multi-DOF devices made of single crystal silicon (SCS).     

Bulk micromachining fabrication platform using the integration of DRIE and wet anisotropic etching

This study presents a bulk micromachining fabrication platform on the (100) single crystal silicon substrate. The fabrication platform has employed the concept of vertical corner compensation structure and protecting structure to integrate the wet anisotropic etching and DRIE processes. Based on the characteristics of wet anisotropic etching and DRIE, various MEMS components are demonstrated using the bulk micromachining platform. For instance, the free suspended thin film structures and inclined structures formed by the {111} crystal planes are fabricated by the wet etching. On the other hand, the mesas and cavities with arbitrary shapes and the structures with different leve l heights (or depths) are realized by the characteristics of DRIE. Since the aforementioned structures can be fabricated and integrated using the presented fabrication platform, the applications of the bulk micromachining processes will significantly increase.This research is based on the work supported by WALSIN LIHWA Corporation and the National Science Council of Taiwan under grant of NSC-91–2218-E-007–034. The authors would like to thank the Central Regional MEMS Research Center of National Science Council, Semiconductor Research Center of National Chiao Tung University and National Nano Device Laboratory for providing the fabrication facilities.     

基于DSVM的并行Hash连接算法及其性能评价

提出了一个基于分布式共享虚拟存储器技术的并行Ｈａｓｈ连接算法,然后设计了一个并行连接算法的测试评价基准,并评价和分析了该算法在均匀情况下３个不同负载的性能比较和Ｚｉｐｆ顺斜数据分布情况下两种度策略的算法性能。同时与其它并行连接算法进行性能比较与分析。     

面向对象数据库系统中的谓词选择率估算

在数据库系统的查询优化中选择率的估算是一个非常重要的问题.这篇文章采用参数化均匀分布法,提出了一套基于数据库统计信息的完整的面向对象数据库系统查询优化中的选择率的估算方法,主要包括复杂嵌套谓词(WHERE子句中的路径表达式)的选择率估算.