分置式牛津型斯特林制冷机的数值分析与实验验证

对分置式牛津型斯特林制冷机进行了数值计算 ,介绍了计算模型考虑到的众多不可逆因素。通过对计算结果与实验结果的对比 ,验证了本文数值计算的准确性 ,说明本文计算模型与数值处理方法是切实可行的     

Object-extending class transformations

Reorganisation and evolution of class hierarchies is important for object-oriented system development and has received considerable attention in the literature. The contributions of this paper are: (1) a formal study of a set of extension relations and transformations on class hierarchies; (2) a presentation of a small set of primitive transformations which form a minimal and complete basis for the extension relations; and (3) an analysis of the impact of these transformations at the object level.The study leads to a better understanding of evolution and reuse of object-oriented software and class hierarchies. It also provides a terminology and a means of classification for design reuse. The theory presented in this paper is based on the Demeter data model, which gives a concise mathematical foundation for classes and their inheritance and part-of relationships. Parts of the theory have been implemented in the Demeter System ^TM C++, a CASE tool for object-oriented design and programming.     

真空技术在污水处理中的若干典型应用

介绍了真空技术在污水处理中的几种典型应用，真空结晶法在以分离污水中具有结晶性能的固体溶剂；真空过滤脱水用于初沉池和消化池污泥脱水，真空浮选法通过制造负压条件加速浮选过程；还有真空搅拌、真空脱气等等。这些足以说明真空技术在污水处理乃至环境保护中占有重要的一席之地。     

基于CORBA和WEB的产品数据管理体系结构研究

 产品数据管理(product data management,PDM)作为产品信息管理集成框架,已成为当前研究开发型企业提高其核心竞争力的一种重要竞争策略.介绍了PDM技术的起源与发展,阐述了PDM的应用功能框架.结合当今软件技术的发展,分析了基于CORBA和WEB技术的PDM/CPC代表性产品Windchill平台的体系结构,指出了传统PDM过渡到CPC的必然发展趋势.     

水稻花后衰退珠心和胚乳发育初期Ca2+的超微细胞化学定位

应用焦锑酸盐沉淀技术对水稻花后衰退珠心和胚乳发育初期进行了Ca^2 的超微细胞化学定位。结果显示在初始衰退的珠心细胞中Ca^2 主要分布于液泡膜上和核内；在衰退中期的珠心细胞中，Ca^ 主要分布在核膜、液泡膜及质膜上；在严重衰退的珠心细胞，Ca^2 仅存在于液泡中。珠心降解的Ca^2 跨过胚囊壁，通过质外体向胚乳内运输；发育初期的胚乳细胞，Ca^2 主要位于胞间隙，线粒体和液泡中也有少量分布。讨论了Ca^2 与珠心PCD的关系。     

Reading handwritten digits: a ZIP code recognition system

A neural network algorithm-based system that reads handwritten ZIP codes appearing on real US mail is described. The system uses a recognition-based segmenter, that is a hybrid of connected-components analysis (CCA), vertical cuts, and a neural network recognizer. Connected components that are single digits are handled by CCA. CCs that are combined or dissected digits are handled by the vertical-cut segmenter. The four main stages of processing are preprocessing, in which noise is removed and the digits are deslanted, CCA segmentation and recognition, vertical-cut-point estimation and segmentation, and directly lookup. The system was trained and tested on approximately 10000 images, five- and nine-digit ZIP code fields taken from real mail     

液压卡紧的原因及其消除措施

针对液压系统中经常出现的液压卡紧现象，初步分析了其原因及消除措施。     

流体势与油气运聚规律研究——以孤东地区为例

流体势是地下流体所有能的综合表现,不同的流体(如油、气、水)在各自的势场作用下,有各自的势场分布规律运动.通过研究地下流体势空间分布模式,可确定盆地流体系统构成,提高对油气运移规律的认识,明确预测有利油气聚集区,提高钻探成功率.研究表明,孤东地区地下流体势类型分为高势区、低势区,高势区分布与活跃生油洼陷分布一致,是孤东地区油气成藏的主要烃源区和动力源区.低势区与目前的油气田吻合较好.由此可依据流体低势区来预测新的油气聚集部位.      

延长高效蓄热推钢式加热炉内衬寿命的措施

对天铁集团带钢高效蓄热推钢式加热炉炉衬的损毁和存在的问题作了探讨，提出了延长内衬寿命的措施。     

二甲基硅油及其表面活性剂在化纤生产中的应用

综述了二甲基硅油及其表面活性剂在化纤油剂中的应用 ,化纤油剂应具有的高平滑性、高耐热等特性 ;介绍了改善油剂的综合性能及硅油表面活性剂用来提高纤维的可纺性等性能的方法。建议我国应尽快开发研制含硅油的化纤油剂