油田单井平均日产油量经济极限确定方法

从f(n,t)曲线的研究出发,得到了求解油田单井平均日产油量经济极限值的数学方程式,介绍了用曲线交汇法求解的过程,分析了油田月递减余率和原油销售价是影响油田单井平均日产油量经济极限的主要因素。该方法在油田开发调整方案的编制和油田开发规划部署工作中将起到一定的作用。     

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。     

Efficient Management of Persistent Knowledge

Although computer speed has steadily increased and memory is getting cheaper, the need for storage managers to deal efficiently with applications that cannot be held into main memory is vital. Dealing with large quantities of clauses implies the use of persistent knowledge and thus, indexing methods are essential to access efficiently the subset of clauses relevant to answering a query. We introduce PerKMan, a storage manager that uses G-trees, and aims at efficient manipulation of large amounts of persistent knowledge. PerKMan may be connected to Prolog systems that offer an external C language interface. As well as the fact that the storage manager allows different arguments of a predicate to share a common index dimension in a novel manner, it indexes rules and facts in the same manner. PerKMan handles compound terms efficiently and its data structures adapt their shape to large dynamic volumes of clauses, no matter what the distribution. The storage manager achieves fast clause retrieval and reasonable use of disk space.     

表达式句法分析及求值算法在优化设计中的应用

针对优化设计技术在机械工程领域的使用特点提出了一种应用表达式分析与求值原理以避免对每个优化模型或实例均需编程求解的解决方法,论述了该方法的要求、原理、实现过程及应用程序框架。     

宜昌站泄流能力变化对葛洲坝设计洪水影响

宜昌水文站是葛洲坝、三峡水利枢纽的设计依据站。葛洲坝水利枢纽动工修建和运行 ,对该站水位流量关系中低水部分产生了影响。探讨了该河段泄流能力的变化对葛洲坝水利枢纽设计洪水有无影响的问题。用1 967～ 1 999年实测资料对宜昌站以汛期平均水位为参数的水位流量关系曲线簇进行了检验 ,大部分年份最大日平均流量、3、7、1 5、30d洪量的偏差在± 4 %之间 ,说明曲线簇推流具有相当的精度。证明了宜昌河段中低水泄流能力的变化对葛洲坝水利枢纽设计流量和校核流量基本没有影响     

Acidity in upland and hill soils: Cation exchange capacity,pH and lime requirement

For 30 acid upland and hill soils, with initial pH from 3.5 to 5.8, and loss on ignition from 14% to 94%, cation exchange capacity varied with pH according to the relationship CEC = m pH+C, where m and C are characteristic of each soil. The slope m depended on loss on ignition (LOI), and is given by: m=Δ CEC/Δ=0.22 LOI+1.92. Because of these relationships, CEC measured at the natural pH of the soil (in 0.025 M MgSO₄ solution) is more relevant to field conditions than a conventional measurement at pH7. An improved method for estimating lime requirement (LR) of these soils was developed, based on the relationship found between LR and the difference in CEC (ΔCEC) between that at the natural pH of the soil and that at the target pH of 5.5: LR=1.12 ΔCEC+1.48. Lime requirement can therefore also be estimated from loss on ignition using the earlier relationships, and is given by: LR=(0.25 LOI+2.15) Δ+1.48, where Δ is the difference between the natural pH (in 0.025 M MgSO₄) and the target pH. Predictions based on this agreed well with results for a further 10 soils.     

高分辨率电阻率测井仪在薄层评价中的应用

传统的测井仪器无法克服纵向分辨率和径向探测深度这一矛盾，高分辨率电阻率测井仪（HDRT）测量精度好、探测深度大且垂向分辨率高，能够准确识别薄互层、评价薄油气层，准确记录油层厚度，可为精细描述油气田地下地质状态提供更多依据。     

多级泵站老化的模糊评价模式

多级泵站是一个包括各级泵站及泵站内各种设施的复杂系统，系统内各个泵站的老化直接影响整个泵站系统的正常运行，采用单元化方法将多级泵站系统单元伦，引和泵站老化评价指标，建立了多级泵站老化的模糊评价模式，并对甘肃省景泰高扬程提水灌区多级泵站系统进行分析，提出了评价多级泵站老化程度的排序方法。     

振冲法在砂场地地基处理中的应用

通过对典型振冲挤密法施工方法的研究，分析了该方法的加固机理，指出它可提高地基承载力、减少沉降和不均匀沉降，且能达到地基抗地震、抗液化能力的效果。     

钻孔灌注桩后压浆技术的应用与效果

介绍了后压浆技术提高灌注桩承载力的作用机理，并列举了四栋高层住宅楼工程中的应用情况，经试验结果分析，指出后压浆技术能大大提高灌注桩的承载力。