低压低渗气藏钻探过程中的保护方案

针对鄂尔多斯塔巴庙区块低压低渗气藏物理特性复杂的情况，推荐一套切实可行的气层保护方案。即实行全面钻井液监控；采用欠平衡钻井技术；储层保护前期研究；采用与地层流体配伍性好的阳离子钻井液体系；降低钻井完井液的滤失量，API滤失量小于5mL、高温高压滤失量小于15mL、固相含量小于8％、含砂量小于0．3％；根据储层裂缝的宽度和走向使用保护剂；对裸眼完钻的气层利用洗井清除井壁附近的污染带，恢复储层原始渗透率；固井作业防止气窜；采用具有抑制地层水敏、速敏保护气层的优质射孔液；水力压裂优化压裂设计，严格压裂施工。总之，气层保护技术是一个系统工程，任何一个环节的问题，都将对气层产生伤害．因此需加强气层保护研究，做到在钻开气层到投产的每道工序都采取积极有效的气层保护措施。     

Application of a Compaction Simulator to the Design of a High-Dose Tablet Formulation. Part I

The compaction properties of an investigational drug are studied by the use of a compaction simulator. The effects of punch velocity over the range of 30-640 mm^-1 on the compaction properties of the pure drug and a variety of formulas incorporating a high dose of the active compound have been investigated. The data were analyzed by applying the Heckel equation. The pure drug was found to have a high yield pressure at a relatively low punch velocity of 31 mm^-1. As the punch velocity was increased there was a decrease in crushing strength, primarily as a result of increasing yield pressure. These findings indicate that the pure drug predominantly consolidated by fragmentation and elastic deformation, with a slow plastically deforming component. The information obtained on the consolidation mechanism of the pure drug and, subsequently, on model formulas were instrumental in the design and selection of a robust formula and granulation process. The advantages of conducting dosage form design and characterization studies during the early phase of tablet formulation using means such as a compaction simulator are emphasized in this investigation.     

Processing and properties of zirconia-toughened alumina ceramics

Al₂O₃:ZrO₂ ceramics have been prepared from physically mixed pure oxide powders. The results indicate that careful processing of the starting powders and a two-stage sintering process can avoid expensive processing methods like hot pressing/hot isostatic pressing used for achieving high densification. The mechanical properties were measured and the resultant microstructure studied to explain the toughening behaviour of this material.     

超高增压柴油机与斯特林发动机复合运行的分析

本文对超高增压柴油机与斯特林发动机的复合运行进行了初步的探讨,陈述了这种复合运行作为未来发动机技术发展方向之一的可能性。     

压力对Fe－29wt％Ni合金超细微粒特性的影响

利用蒸发冷凝法，制备了不同平均粒径的Ｆｅ－２９ｗｔ％Ｎｉ合金超细微粒。在不同压强下，将超细微粒压制成片。随压强增大，马氏体体积分数和比饱和磁化强度σｓ明显增大，而矫顽力Ｈｃ呈线性下降。压力效应与平均粒径ｄ大小密切相关     

可重复高压灌浆土层锚杆

论述了可重复高压灌浆锚杆的结构构造以及其独特的灌浆工艺，探讨了该类锚杆的承载能力特性。文中还给出了该类锚杆在不同地层中应用的几个实例。     

Effect of pretreatments and freezing rate on the firmness of potato tissue after a freeze–thaw cycle

The texture of potato tissue after a freeze–thaw process using different freezing rates and different pretreatments was analysed, in order to select the best strategy for optimum preservation of the textural characteristics of pre‐frozen potato. Ten blanching conditions were tested and a two‐step blanching process with calcium chloride (0.07 g mL^?1) proved the most effective in protecting the tissue after a freeze–thaw process (maximum load force around 10–55% of the raw tissue, depending on potato batch, for air‐blast freezing and 20–60% for immersion freezing). Vacuum impregnation at 100 and 400 mbar, even when followed by different pre‐drying treatments to remove excess water, was very detrimental to resistance to a freeze–thaw process (maximum load force below 10% of the raw tissue for air‐blast freezing and below 20% for immersion freezing). Microstructure analysis confirmed better tissue integrity retention with ethyleneglycol immersion freezing instead of air‐freezing. Differences were found between batches with a 6‐month difference in storage time, indicating that the fresher batch was more suitable for freezing.     

刮板输送机接链用千斤拉的研究

针对刮板输送机的掐链、接链问题,研制出新型掐、接链用千斤拉,介绍了该装置的结构特点和工作原理,并对使用效果进行了分析。     

中压甲铵冷凝器防结垢方法探讨

分析中压甲铵冷凝器的工艺流程和操作条件，指出设计中的不足，找出其结垢的非药剂因素——温度和流速，对一些相关改造的成败提出观点，并提出增设加压泵回流控温和增大上、回水压差的新思路。     

Equal Strain Consolidation by Vertical Drains

This paper shows the development of a series of closed-form solutions of equal strain consolidation in the presence of a vertical drain with smear and well resistance. Using an approach that considers the effects of both the radial and vertical drainage in a fully coupled fashion, solutions are obtained for the excess pore pressure and the degree of consolidation in the compressible soil subjected to a step- or ramp-loading situation. The closed-form solutions in the present paper may be evaluated in an electronic spreadsheet on a standard personal computer.