浅议铵梯炸药质量检验中的三个问题

文章探讨了GB 12437-2000标准规定的产品检验项目中,中包浸水试验的科学性问题和对批产品进行抽样时的样本代表性问题以及使用多段爆速仪测试爆速时应注意的样本量问题.     

提高小样试织质量的措施

介绍了纺织品小样试织时，为了提高试织质量在经纬纱准备及织造工序时所采取的一些措施。     

Terminal velocity of non-spherical particles falling through a Carreau model liquid

A procedure has been proposed for the estimation of the terminal falling velocity of non-spherical particles moving in a Carreau model fluid in the transition flow region. The procedure is based on a modification of the relationship formerly developed for the fall of spherical particles including the particle dynamic shape factor. The suitability of the proposed procedure has been confirmed by good agreement between experimental and calculated terminal falling velocity data. In the experiments, the terminal falling velocity of short cylinders and rectangular prisms in polymer solutions of different measure of shear thinning and elasticity has been measured.     

数字电视的标准符合性检测

介绍了我国数字电视标准化总体情况，重点介绍接收端的标准化工作现状及数字电视的标准符合性检测情况。     

The stress intensity factors for a short crack partially penetrating an inclusion of arbitrary shape

Some approximate solutions for predicting the stress intensity factor of a short crack penetrating an inclusion of arbitrary shape have been developed under mode I and mode II loading conditions. The derivation of the fundamental formula is based on the transformation toughening theory. The transformation strains in the inclusion are induced by the crack-tip field and remotely applied stresses, and approximately evaluated by the Eshelby equivalent inclusion theory. As validated by detailed finite element (FE) analyses, the developed solutions have good accuracy for different inclusion shape and for a wide range of modulus ratio between inclusion and matrix material.     

新疆油田微生物开采稠油技术研究及矿场试验

通过室内筛选复壮,选育出对克拉玛依稠油具有显著降粘作用的微生物菌种.室内降粘实验结果表明,菌种对稠油的降粘率可达70%,同时菌种可以改善稠油的流体性质.原油族组分分析结果表明,菌种能够降解稠油中的非烃和长链饱和烃.首次在克拉玛依油田进行了6口井的微生物吞吐开采稠油矿场试验,累计增油865t.     

棉织物手感值的模糊综合评判研究

利用模糊综合评判数学模型对棉织物的手感值进行了计算与分析，这种方法简单、可靠，与主观评估结果有很好的一致性，为纺织生产的质量判断提供了便利。     

Identification of the minimum effective dose for right-censored survival data

In this paper, we consider identifying the minimum effective dose (MED) in a dose-response study when survival data are subject to random right-censorship, where the MED is defined to be the smallest dose level under study that has survival advantage over the zero-dose control. To this end, we suggest single-step-down testing procedures based on three different types of weighted logrank statistics, respectively. The comparative results of a Monte Carlo error rate and power/bias study for a variety of survival and censoring distributions are then presented and discussed. The application of the testing procedures for identifying the MED is finally illustrated by using a numerical example of prostate cancer data.     

多测井曲线的综合处理合成

测井曲线是地质分层的基础，但在利用单一测井曲线解决复杂地质问题时也存在多解性和局限性。为克服多解性，人们采用多种测井曲线进行地质分层，提高了分层的精度。本文在此基础上提出把多条曲线分别赋予不同的加权因子，然后进行归一化处理，形成一条标准综合参数测井曲线。此综合参数曲线突出了所选的多条测井曲线的公共信息，减少或削弱了单一测井曲线中的偶然误差，提高了综合后测井资料的可信度。该方法可应用于地质分层、岩性分析、含油气预测等诸多领域。应用时要注意，并非所选择的测井曲线种类越多越好，而是要选择那些最能反映地层单元特征信息的测井曲线。     

俄罗斯减速器涡轮钻具驱动PDC钻头在西西伯利亚油田的成功应用

涡轮钻具由前苏联研制出来以后，得到了迅速发展，目前已发展到减速器涡轮钻具阶段。现在，俄罗斯西西伯利亚地区普遍使用减速器涡轮钻具钻井，而减速器涡轮钻具驱动PDC钻头的使用还是空白。采用俄罗斯生产的几种不同型号的减速器涡轮钻具，在西西伯利亚进行了驱动PDC钻头钻井的阶段性试验。试验结果表明，在优选PDC钻头结构的情况下，用减速器涡轮钻具驱动PDC钻头，钻头进尺和机械钻速都较牙轮钻头有显著的提高，经济和社会效益显著。介绍了试验中使用的3种俄罗斯减速器涡轮钻具(TPM-195，TPⅢ-195和TPO3—195)的结构特点和主要技术参数。