Preparation and Structural Defects of Al2-xZrx＋yTi1-yO5 and Al4.54Si1.46O9.73 Multiphase Material

In the study, sludge from the aluminum profile factory and kaolin were used as the raw materials. Through adding ZrO2 mineralizer in different contents, Al2-xZrx+yTi1-yO5 and Al4.54Si1.46O9.73 solid solution multiphase material was prepared to effectively inhibit the decomposition of aluminum titanate solid solution and optimize high temperature property of the multiphase material. With XRD and SEM means, crystalline structure and microstructure of each sample were characterized, and properties of each sample were tested. According to experimental results, the optimal addition amount of ZrO2 mineralizer was determined to be 1.5%. Correspondingly, contents for aluminum titanate solid solution, mullite solid solution and α-Al2O3 were 70.3%, 26.8% and 2.9% respectively, bulk density was 3.20 g/cm3, degree of porosity was 5.57%, water absorption rate was 1.74%, and the once thermal shock rupture strength retention rate was 90.52%.     

复方维生素B片中主要成分的高效毛细管电泳电化学法检测

采用高效毛细管电泳－电化学检测法同时测定复方维生素B片中的主要成分维生素B1，B12，B6和C的含量；研究了电极电位，运行缓冲溶液的浓度和酸度，电泳电压和进样时间等对电泳的影响，以微铂电极为工作电极，检测电位＋0．5V（vs SCE)，在pH9.0的15mmol/L Tris-1mmol/L H3BO3缓冲溶液中，上述4组分在5min内获得基线分离；维生素B1，B12，B6和C的线性范围分别为2．1mg/L-1.0g/L,6.0mg/L-0.80g/L,1.4mg/L-0.72g/L和0．97mg/L-0.44g/L检出限分别为0．50mg/L,1.0mg/L,,0.65mg/L和0．40mg/L；5次测定峰高的相对标准偏差分别为2．4％，3．0％，3．1％，和2．5％，5次测定的平均回收率分别为99％，102％，98％和100％。     

90年代的广义度量空间理论

广义度量空间理论是一般拓扑学研究的重要课题。本文综述了90年代广义度量空间理论的成就，分析了它的主要研究课题，所取得的重要结果是国内学者在该方向的贡献。     

A new-style phased array transducer for HIFU

Considering the complexity of common phased array, and relatively slow mechanical scanning of the single transducer, a new-style transducer that has a changeable focus and a simple control system is needed. The sector phased array transducer, which has many advantages including easy fabrication, movable focus, and a simple control system, can reach the desired requirements. This paper has demonstrated its feasibility by the computation of acoustic field in (y, z) plane. The 24-element phased array, of which the length of the focal region is about 10 mm, and the maximum lateral diameter is about 1.5 mm, can accomplish the adjustment of the focus position. The maximum lateral displacement is 1.5 mm, and the treatment area is about 9 multiples of the single transducer, and only six power amplifiers are needed.     

局部可数集族、局部有限集族与Alexandroff问题

本文引进分层强ｓ－映射和分层强紧映射建立具有σ－局部可数网、具有σ－局部可数ｋ－网、具有σ－局部可数基的正则空间以及σ－空间、－空间、ｇ－可度量空间和确定的度量空间之间的联系．这些都是对Ａｌｅｘａｎｄｒｏｆｆ问题的回答．     

N-乙基-1,10-菲罗啉-2-甲胺镍(Ⅱ)配合物的合成、晶体结构及性质研究

0IntroductionPhenanthrolinederivativescontainingaminegroupshavebothsoftandhardsitesandaregooddonorsformetalions.1,10鄄phenanthrolineanditsderivativeshavebeenextensivelyusedasligandsinbothanalyticalandpreparativecoordinationchemis鄄try[1].Mostoftheseworksh…     

消费者连续统集合下一种投入产出经济的均衡和一般均衡价格

本给出了一个经济模型把跨期间的一般均衡理论和neo-Ricardian的生产价格理论联系起来，并改进了Roce-Anne Oana模型[1][2]。即把消费有限改变消费连续统，并在Rose-Anne Dana模型的基础上，加了条件C.4和C.7，得出了两个重要的结果：（1）在标准条件下，此模型有一均衡使得每一个生产的每期最大利润是相等的；（2）如考虑生产价格是稳定价格；且等于最大利润；则在适当的条件下，这样的价格系统是存在且唯一的，而所定义的均衡的非折扣的价格序列收敛于生产价格。因此均衡价格依赖于技术和消费特征，但在取极限时，有关价格仅依赖于技术。     

氧化锌荧光粉合成的热力学计算

六面体的ZnO:Zn,因其具有较高的导电率和光电导特性,故在低能的电子激发下就能发光,目前已广泛地被用为低压显示器件的发光层涂料.ZnO:Zn的发光机理,早就有学者提出了一些假设,有的认为它的绿色发光是由过量锌引起的,也有认为是过量的锌和氧的空位存在所致.总之,ZnO:Zn之所以会发光.     

On the Action of a Groupoid on a Manifold

In this paper,some properties of reduction for symplectic F-spaces are discussed.The properties of stable subgroups are discussed.We find that the symplectic action of a symplectic groupoid on a symplectic manifold can induce a symplectic map between reduced symplectic manifolds.This symplectic action can be characterized by the action of its induced symplectic groupoid on a symplectic manifold.Lastly,we shall discuss Poisson reduction and give a Poisson reduction theorem.