关于混凝土钻芯取样法有关标准的讨论

本文对国内不同行业有关混凝土钻总取样方法的标准进行了讨论，供月行在使用和修订相应标准时参考。     

Preparation of monodisperse poly(vinyl alcohol) microspheres by heterogeneous surface saponification and iodine complex formation

Monodisperse poly(vinyl acetate) (PVAc) microspheres with high molecular weight obtained by suspension polymerization of vinyl acetate were saponified in alkaline aqueous solution to keep their spherical structure. The saponification was restricted on the surface of the PVAc microspheres and obtained particles had skin/core structure. Various poly(vinyl alcohol) (PVA) microspheres with different diameters and degrees of saponification (DSs) were obtained. The conversion of PVAc to PVA during the heterogeneous surface saponification time were examined by nuclear magnetic resonance spectroscopy and after 72 h hydrogel type PVA microspheres completely saponified were obtained. The crystal melting temperatures of the microspheres obtained by the saponification were measured a constant value of 238°C irrespective of varying DS, and the peaks became enlarged as reaction time. Iodine complexes were formed in saponified microspheres with DS of 41% and 99% by immersing them in I₂/KI aqueous solution and decomposed by the reduction of I₂ in the complexes to 2I^? using sodium sulfite to confirm whether the skin formed through the saponification was composed of PVA with high VA content. Obviously, characteristic blue color developments owing to I₅^?‐PVA complexes were observed in both saponified regions and a red in the PVAc core. Consequently, it was concluded that the PVA skins formed by heterogeneous surface saponification had high DSs. Such complexes endowed polymeric microspheres a good radiopacity which would be useful in clinical treatment of vascular diseases and were examined by X‐ray irradiation image. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Techniques and Apparatus for Measuring Rotational Core Losses of Soft Magnetic Materials

In many situations such as the cores of a rotating electrical machine and the T joints of a multiphase transformer, the local flux density varies with time in terms of both magnitude and direction, i.e. the flux density vector is rotating. Therefore, the magnetic properties of the core materials under the rotating flux density vector excitation should be properly measured, modeled and applied in the design and analysis of these electromagnetic devices. This paper presents an extensive review on the development of techniques and apparatus for measuring the rotational core losses of soft magnetic materials based on the experiences of various researchers in the last hundred years.     

聚酯装置熔体过滤器的国产化改造

熔体过滤器为聚酯装置关键设备,其国产化问题一直未能解决。该文通过对天津分公司200kt/a聚酯装置熔体过滤器改造方案的介绍,探讨了其国产化条件,分析了国产熔体过滤器的结构特点,并与进口过滤器进行了对比,提出了一些看法。     

旋转控制头胶芯失效形式分析

在欠平衡钻井过程中，胶芯是旋转控制头核心密封元件，通过对Williams 7100型旋转控制头胶芯失效形式进行分析，并提出了相应的对策，旨在推动胶芯的国产化进程。     

岩心扫描成像技术及其网络数据库管理系统

伴随着信息技术的发展,传统的岩心管理方法已不适应现代信息共享的需求。为了有效地发挥岩心这一珍贵地质资料在生产、科研和管理中的作用,通过对岩心扫描成像技术的介绍,系统地描述了岩心扫描仪的特点、数据库的建立、岩心资料的永久性保存和管理以及网络化管理。认为随着计算机技术的不断发展与进步,信息技术在提升石油勘探开发水平方面将会起到重要作用,改进传统的岩心图文资料管理方法,推行计算机管理是现代信息管理的必然要求。     

IT for niche companies: is an ERP system the solution?

Abstract.  Niche companies are per definition idiosyncratic. They survive in a competitive world by mastering a small market niche, providing what their customers need. This often requires a flexible organization, and the ability to customize products. To be more efficient, many of these companies rely on extensive use of IT, often by installing general Enterprise Resource Planning (ERP) systems. These systems have grown from isolated systems that handle planning based on incoming orders and the component structure of the various products, to systems with ambitions to embrace the total functioning of the company including vendor and customer relation management. In this paper, we present four case studies. One company is a part of a large enterprise, but performs niche functions within this enterprise. The other three are small- or medium-sized enterprises. Each of these performs in small niche markets. Common to all is the fact that they encounter problems with the utilization of their ERP systems. The major problem seems to be that the ERP system has an inherent business model that may not conform to the needs of the company. Without a good understanding of the underlying models and the constraints under which the fundamental algorithms operate, it is difficult to use these systems correctly. Even excellent systems may give bad results if they are applied to situations where they are not suited. Further, the monolithic structure of an ERP system, with a rather complicated parameter setting, is often insufficient to mould the system to the needs of a niche company. We discuss these problems based on our four case studies, and offer alternative approaches that may be considered.     

激光焊接超细基胎体金刚石薄壁钻

采用激光焊接超细预合金粉胎体，开发了新的薄壁钻产品，通过对与现有的产品工艺、性能测试以及实际使用分析对比，结果表明：激光焊接与普通钎焊相比结合强度提高2－3倍，克服了胎体脱落问题，胎体耐磨性提高了50％－120％，其中轴向磨损速率提高1．2倍；钻削速度提高30．4％，工矿适应性增加，使用寿命提高25％－108％。     

探地雷达在莲花电站二坝坝顶路面裂缝探测中的应用

介绍探地雷达探测方法,探讨使用高频探地雷达探测粘土心墙堆石坝坝顶混凝土路面裂缝,达到快速、无损查明坝顶混凝土裂缝的性质与成因的目的.     

连铸坯的液芯轧制

研究了连铸坯的液芯轧制，并结合日本川崎永岛厂的实例，证实了连铸坯液芯轧制的可行性，指出了钢锭和连铸坯液芯轧制的区别，及如何制造压应力状态，推导了坯壳应力与轧辊直径压下量，坯壳厚度的关系，并提出了用振摆式轧机实施连铸机液芯轧制的方案。