液体静力称量法液体密度测量及其不确定度评定

介绍了液体静力称量法测量液体密度的原理并给出液体密度的计算公式,对影响测量结果的各种因素作了详细的分析,并对各个分量所引入的不确定度进行了数值计算,得出液体密度最终测量结果的合成标准不确定度.     

靖边薄层云岩气藏对储层改造技术的地质需求

靖边气田古生界奥陶系马家沟组马五21和马五31气藏、已探明天然气地质储量530×108m3.气藏具有低压、低渗和低产的特征,非均质薄层云岩储集层产出能力受局部鼻状构造部位和岩性双重制约.天然裂缝发育程度差别大、且又分布不均匀.主要储层结构为缝洞-孔隙型和裂缝-孔隙型,因而压裂施工作业中,破压梯度高、延伸裂缝压力高、人工造缝缝宽窄.依据产能差别,将现有生产井分为Ⅲ种类型.文中提出采用王水酸化施工作业、层内爆裂--稠化酸酸化联作、层内爆裂--稠化酸携砂压裂联作的技术新方案,来提高气田采收率.     

基于IPC的直流电机控制实验装置设计

介绍了工业控制计算机（IPC）在工业自动化领域中对直流机控制的应用，以工控机作为实验平台。设计了IPC测控系统之一的直流机测控子系统的实验装置，叙述了如何用IPC进行直流机转速的脉冲调宽式（PWM）控制，并通过软件实现在多任务实时操作系统（MROS）申直流机的速度测控和速度曲线绘制。     

CMOS电路中抗Latch-up的保护环结构研究

闩锁是CMOS集成电路中的一种寄生效应,这种PNPN结构一旦被触发,从电源到地会产生大电流,导致整个芯片的失效。针对芯片在实际测试中发现的闩锁问题,介绍了闩锁的测试方法,并且利用软件Tsuprem4和Medici模拟整个失效过程,在对2类保护环(多子环/少子环)作用的分析,以及各种保护结构的模拟基础之上,通过对比触发电压和电流,得到一种最优的抗Latch up版图设计方法,通过进一步的流片、测试,解决了芯片中的闩锁失效问题,验证了这种结构的有效性。     

吹填粉细砂筑堤实践与研究

岳阳长江干堤是我国第一大河重要堤防,具有重要的战略地位。江南垸堤段每到汛期,堤身散浸,堤后管涌、海底浸不断,根据各方面比选决定采用吹填粉细砂筑堤进行治理。文章对大堤设计断面及排水方案进行拟定并对渗流稳定、堤坡稳定及地震反应进行分析,认为所拟定的加固断面可行,投资省。     

Testing multi-characteristic product capability indices

Recently, studies associated with testing the quality and performance of each process for a product with multi-characteristics are proposed more often. However, most studies are limited to discussing one single type of quality characteristic. Practically, a multi-characteristic product is potentially composed of three types: smaller-the-better, larger-the-better, and nominal-the-best. In this paper, we propose an integrated product capability index which considers these three different types of quality characteristics. According to the theory of testing hypothesis, we develop a testing procedure for the product capability index to judge whether the process capabilities of total quality characteristics meet the customers’ demands. In addition, the relationship between the product capability index and the yield of the entire product will be introduced. Finally, an example is provided as a practical application.     

浅析作业成本法在企业中的有效实施

本文通过对作业成本法及其应用情况的总结和归纳,就企业如何有效实施作业成本法进行了粗浅的探讨。     

Tunnel stability and arching effects during tunneling in soft clayey soil

A series of centrifuge model tests and numerical simulations of these tests were carried out to investigate the surface settlement troughs, excess pore water pressure generation, tunnel stability and arching effects that develop during tunneling in soft clayey soil. The two methods were found to provide consistent results of the surface settlement troughs, excess pore water generation, and the overload factors at collapse for both single and parallel tunneling. The arching ratio describes the evolution of the arching effects on the soil mass surrounding tunnels and can be derived from the numerical analysis. The boundaries of the arching zones for both single tunneling and parallel tunneling were determined. In addition, the boundaries of the positive and negative arching zones were also proposed.     

钻井过程中水合物层化学稳定实验研究

油田试验显示,钻井液中加入Lecithin可稳定北极Cascade地区水合物层。针对这一现象开展了一系列实验研究。通过特制的实验装置,对加入不同含量Lecithin后钻井液Ⅰ、Ⅱ、Ⅲ(或加入部分水)体系中甲烷水合物形成的热力学条件和甲烷水合物的生成速度与数量进行了测定。实验结果表明:Lecithin的加入基本上不影响钻井液中甲烷水合物形成的热力学条件;对于钻井液Ⅰ和钻井液Ⅲ的实验流体体系,Lecithin是很好的甲烷水合物生成促进剂。     

Coordinating Agents in Shop Floor Environments From a Dynamic Systems Perspective

In this paper, we address agent coordination from a dynamic systems perspective and propose a dynamic coordination model, which is inspired by biological metabolic systems. A new coordination mechanism through dynamic local adjustment (CDLA) is presented, and coordination is achieved when every agent utilizes explicitly the global system dynamics and performs iteratively a dynamic local adjustment procedure. The CDLA mechanism is investigated in an example multiagent shop floor system. The results show that the example manufacturing process is well-coordinated and the coordination approach is practically applicable and effective