包含两类变量的离散变量框架结构拓扑优化设计

将包含两类变量的桁架结构拓扑优化设计的概念及求解离散优化的相对差商法进一步推广到由梁单元组成的框架结构的拓扑优化，建立了包含两类变量的框架结构拓扑优化设计模型，构造了包含应力约束和位移约束的统一约束函数，发展了统一处理两类变量，求解包含两类变量的框架结构拓扑优化设计问题的算法，并给出了两个算例．     

利用空间大地测量技术研究地球动力学最新进展

空间大地测量以高精度，高时空分辨率测定地球整体（地球自转）和各圈层（特别是大气，海洋与地壳）的运动，使地球动态变化的监测，研究及应用呈现了崭新的面貌，本文介绍了近年来国际地球动力学最新发展概况，内容包括地壳运动，地球自转，重力场时间变化等。     

铝电解槽焙烧用矩形高速燃烧器的研制

铝电解槽的焙烧对槽的正常生产和以后的槽寿命有着直接影响，燃料焙烧法具有加热均匀、升温速度容易控制、对扎缝和边部扎固糊的焙烧充分等优点，是一种非常有前途的新焙烧方法。而燃烧器的设计是燃料焙烧法的关键技术之一，在实验的基础上开发出一种矩形高速燃烧器，并对该燃烧器的结构进行了优化，研制的矩形顺具有点火容易、燃烧稳定、负荷调节比大燃烧完全度高、噪音低等特点，能完全满足铝电解槽燃料焙烧方法的要求，它的研制成功为铝电解槽焙烧新技术的应用提供了技术保证。     

Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

Preparation of (R)-and (S)-2-Allyl-1,3,2-Dinaphtho(α,β)[d.f]dioxaborepin and Their Reactions with Aldehydes

0　IntroductionEnantiopure 1,1′ bi 2 naphtholspossessingC2 chiralityhaveprovedtobeversatilechiralauxiliariesinanumberofasym metricreactions[1 \|6] .Althoughsomeboroncompoundsofthemhavebeenprepared[7 1 6] ,chemistryoftheirallylboranederivativeshasneverbeenreported .Toexplorepossibilityofapplyingseven memberedcyclicchrialallylboronateesterstoasymmetricsynthesisofchiralβ alkenylalcohols,whichareimportantintermediateinthepreparationofopticallyactivenaturalproducts,werecentlyat temptedtosynthesi…     

基于极大似然的智能地雷被动声阵列测向

被动声定位是智能地雷的关键技术之一，其中声传感器阵列测向确定了目标的方位角信息。通过Cramer—Rao下界分析了影响测向精度的因素，并将极大似然估计应用于智能地雷均匀圆阵的测向技术中，通过外场测试对坦克目标进行了相关的测向分析，结果表明精度满足智能地雷的系统要求。     

Ordinary Toxicity of Chlorine Dioxide and By-products Chlorite and Chlorate in Water

Acute toxicity and accumulated toxicity of chlorine dioxide (ClO2) and by-products chlorite (ClO2-) and chlorate (ClO3-) in water acted on mice are studied by the method of Horn and accumulation coefficient. Subchronic toxicity of the mixture of ClO2 and ClO2-and ClO3- in water acted on rat is studied though feeding test for 90 days, including statistical analysis of variance on weight gaining, food utilization efficiency,index of blood and serum,liver (or kidney) to body weight ratio, and histopathological examination on liver and kidney. The results show that aqueous solution of ClO2, NaClO2 and NaClO3 ( with the concentration of 276.5 mg/L, 200 mg/L and 200 mg/L respectively) and the mixed aqueous solution of ClO2 with the concentration of 553 mg/L are actually non-poisonous , and non-cumulative aqueous solution as well.     

废弃钻井液减量化方法探讨

论述了废弃钻井液减量化的主要方法。通过这这些方法的具体运用,可有效减少废弃钻井液的产生量和排放量,减少对周围环境和地下水的污染,保护生态环境,使钻井作业达到法律法规和标准的要求,树立钻井企业形象,提高国内外钻井市场占有率和经济效益。     

振动悬浮铸造对ZA27合金组织及性能的影响

研究了振动悬浮铸造对ZA27合金显微组织、致密度和机械性能的影响。结果表明，单纯振动及单纯悬浮铸造都能明显细化晶粒，提高合金的致密度，改善合金的性能，而将两种方法相结合，效果更好。与普通铸造相比，抗拉强度巩提高了2．63％，延伸率艿提高了2．67％，密度提高了3．46％．