小功率单片CMOS不间断电源

介绍了一种无工频变压器的小功率单片ＣＭＯＳ不间断电源（ＵＰＳ）。它由一片ＭＡＸ６１０构成,电路结构简单,外围元件少,体积小,稳压性能良好,而且具有欠压,过压保护和电流过流保护,适用于小型智能仪器和便携式数字仪表。     

Mo-La2O3阴极丝的AES深度剖析

激活后发射良好的Mo La2 O3 阴极表层含有大量镧 ,原子浓度比约为 (稍大于 )10 % ;发射衰减的阴极表层中镧含量减少 ,未激活的原始阴极丝表层中镧更少。对不同状态阴极中氧含量及其变化的比较 ,以及碳、钼峰分析认为 :发射良好阴极中镧的活性程度较大 ,即超额镧的存在是影响阴极工作性能的主要因素 ;衰减后阴极中镧的总量虽不小 ,但镧的活性显著降低是阴极发射不好的主要原因     

挖掘补偿潜力 提高功率因数

本文分析了实行双休日后,工厂电网功率因数降低的原因及潜力,提出了提高功率因数的技术和管理措施,实践证明效果良好。     

用VC6.0开发OLE DB Provider的技术

随着信息化时代的不断深入,信息处理和信息共享变得越来越重要,数据访问技术对于信息系统也就显得尤为重要。现今处理日常业务必需的大量的非常重要的信息,是在传统的数据库之外。ＵＤＡ（ＵｎｉｖｅｒｓａｌｄａｔａＡｃｃｅｓｓ）提供了应用程序对各种信息源的数据存储的统一访问。通过ＵＤＡ对某种数据源进行访问时,必须提供相应的ＯＬＥＤＢＰｒｏｖｉｄｅｒ本文论述了ＯＬＥ ＤＢ的基本概念,并结合实例说明如何用ＶＣ６．０ 开发ＯＬＥＤＢＰｒｏｖｉｄｅｒ。     

克拉玛依油田530井区下乌尔禾组地应力研究

利用岩心分析测定、测井解释、压裂过程分析和微地震波法等多种监测手段,研究了地应力及裂缝特征。结合地应力场的数值模拟工作,描述了地应力与裂缝的分布以及二者之间的关系。结合油井动态和分析还发现,地应力的大小与油气富集程度,尤其是单井初期产量,有较好的线性关系。克拉玛依油田八区530井区下乌尔禾组,水平主应力及主裂缝方向为东西向,中都低应力区为初期产量较高的部位。     

Overview of Human HtrA Family Proteases and Their Distinctive Physiological Roles and Unique Involvement in Diseases,Especially Cancer and Pregnancy Complications

The mammalian high temperature requirement A (HtrA) proteins are a family of evolutionarily conserved serine proteases, consisting of four homologs (HtrA1-4) that are involved in many cellular processes such as growth, unfolded protein stress response and programmed cell death. In humans, while HtrA1, 2 and 3 are widely expressed in multiple tissues with variable levels, HtrA4 expression is largely restricted to the placenta with the protein released into maternal circulation during pregnancy. This limited expression sets HtrA4 apart from the rest of the family. All four HtrAs are active proteases, and their specific cellular and physiological roles depend on tissue type. The dysregulation of HtrAs has been implicated in many human diseases such as cancer, arthritis, neurogenerative ailments and reproductive disorders. This review first discusses HtrAs broadly and then focuses on the current knowledge of key molecular characteristics of individual human HtrAs, their similarities and differences and their reported physiological functions. HtrAs in other species are also briefly mentioned in the context of understanding the human HtrAs. It then reviews the distinctive involvement of each HtrA in various human diseases, especially cancer and pregnancy complications. It is noteworthy that HtrA4 expression has not yet been reported in any primary tumour samples, suggesting an unlikely involvement of this HtrA in cancer. Collectively, we accentuate that a better understanding of tissue-specific regulation and distinctive physiological and pathological roles of each HtrA will improve our knowledge of many processes that are critical for human health.     

煤炭系统技术进步的测定及分析

以国务院下达的考核企业技术进步指标体系为基础,结合煤炭系统的特点,调整了部分指标．并采用层次分析法确定了各指标的仅数,利用指标体系法分析了南屯煤矿技术进步的状况。     

离心式循环压缩机的故障修复

介绍了离心式循环压缩机中间接简轴承座损坏镶套环修复的方法及检修关键技术参数。     

铝合金表面激光熔覆Fe-Al青铜合金层的组织结构

研究了铝合金表面激光熔覆Fe-Al青铜层的组织结构,结果表明,熔覆层的组织结构为孪晶结构的α-Cu+颗粒状(Cu, Fe, Si)     

Surface Carbonization of Mo-La2O3 Cathode

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