浅谈气泡混合轻质土的特点及应用

结合高速公路的发展,分析了气泡混合轻质土的设计机理,详细地介绍了气泡混合轻质土的工程特性,阐述了气泡混合轻质土在公路建设中的应用,最后对气泡混合轻质土的应用前景进行了展望。     

Polyethylene mixed crystal infra-red spectroscopy: The influence of matrix isotopic species on guest conformation

The chain conformation of solution-crystallized polyethylene has previously been confirmed by infra-red spectroscopy, using the CD₂ bending bandshape for samples with a minority of the deuterated species^1–3. The method of calculating the i.r. band profile from molecular conformational models is now developed to give a more accurate representation of doublet splittings and to include the singlet component. The CH₂ bending profile is calculated for samples with a deuterated matrix, and the good agreement with experimental data indicates that the same molecular model is applicable for samples with the deuterated polymer as either guest or matrix, for identical crystallization conditions. This result implies that isotopic fractionation is unimportant under these conditions.     

云2-平1多台阶变方位水平井钻井液技术

云2-平1井是位于复杂断块油气田上的一口中曲率半径水平井,水平段长820.86 m,水平段多台阶、方位角变化幅度大(29.6°),井下摩阻大,钻井液的携砂、润滑及防卡能力是该井钻井成功的关键。该井选用有机正电胶-聚合物钻井液体系,用高分子量聚合物胶液进行维护,以提高体系的悬浮携岩及防塌能力,通过加入液体磺化沥青、原油及与之相配伍的固体乳化剂来提高润滑性,配合良好的四级固控设备及时清除有害固相,使钻井液性能稳定且易于调整,增强了泥饼的韧度和强度,完全达到了充分悬浮携带岩屑、润滑防卡、稳定井壁的要求。在钻进过程中仔细观察钻井液的动切力、动塑比、静切力初终值、固相含量、含油量、膨润土含量等性能参数的变化,“细化、超前、配套”是该井钻井液性能稳定、效果良好的主要维护处理经验。下套管、钻杆输送测井顺利,井下摩阻始终小于10 kN,全井安全无事故,仅用45d8 h钻完3200 m的进尺。     

An environment for prototyping distributed applications

Designing a distributed application is an extremely complex task. Proper facilities for prototyping distributed applications can be useful in evaluating a design, and also in understanding the effect of different parameters on the performance of an application. We describe a language for prototyping distributed applications, that supports different communication primitives with specified delay, and provides primitives to aid debugging and evaluation. Our environment for executing distributed programs supports heterogeneous computation in which processes can execute on different hardware. Different source languages can be used for coding different modules of the processes. The system has a centralized control and monitoring facility which is based on the Suntools window system.     

非化学计量LaNi5型储氢合金的性能

采用富La混合稀土与Ni、Co、Mg等元素组合，获得了一种非化学计量LaNi5型储氢合金、用金相、XRD和SEM-EDX等方法分析了该合金的组织结构，研究了合金的气相储氢特性以及电化学性能，结果表明：在1.6MPa氢压和温度29℃下，该合金的储氢量达到1.58%（质量分数），该合金的放电容量为380mAh/g。经300次循环后容量保持率为55%，该合金的基体是CaCu5型结构的LaNi5相，但有第二相（LaMg)Ni3析出，这种第二相的形成是导致该合金大容量的关键。     

多任务调度算法在单片机控制系统中的应用

为了满足单片机控制系统的复杂要求 ,提出了多任务调度算法 ,通过与单任务程序结构的对比和分析 ,详细说明了多任务调度算法的实现 ,指出了应用该算法的必要性 ,并且以科研生产的实例说明其具体应用。     

一种新型冰箱测试系统设计与应用

介绍了一种用于冰箱检测的新型测试系统，并在WIN98环境下用VB6．0实现该系统软件。该系统可以同时对四台冰箱的温度参数及其中一台冰箱的耗电量进行检测，该系统具有成本低，性能稳定的优点。     

Optimal Operation of Reservoir Systems using Simulated Annealing

A stochastic search technique, simulated annealing (SA), is used to optimize the operation of multiple reservoirs. Seminal application of annealing technique in general to multi-period, multiple-reservoir systems, along with problem representation and selection of different parameter values used in the annealing algorithm for specific cases is discussed. The search technique is improved with the help of heuristic rules, problem-specific information and concepts from the field of evolutionary algorithms. The technique is tested for application to a benchmark problem of four-reservoir system previously solved using a linear programming formulation and its ability to replicate the global optimum solution is examined. The technique is also applied to a system of four hydropower generating reservoirs in Manitoba, Canada, to derive optimal operating rules. A limited version of this problem is solved using a mixed integer nonlinear programming and results are compared with those obtained using SA. A better objective function value is obtained using simulated annealing than the value from a mixed integer non-linear programming model developed for the same problem. Results obtained from these applications suggest that simulated annealing can be used for obtaining near-optimal solutions for multi-period reservoir operation problems that are computationally intractable.     

合山电厂3个机组主厂房定向爆破拆除

介绍了广西合山电厂 1#～3# 机组主厂房定向爆破设计与施工.该工程不仅规模大、环境十分复杂、工期紧、难度高、风险性极强,最大特点是拆除发电设备与爆破同步进行施工.