Conditioned reinstatement of drug-seeking behavior with a discrete compound stimulus classically conditioned with intravenous cocaine.

The present study investigated the ability of a light and tone (LT) compound stimulus paired with cocaine infusions to reinstate cocaine-seeking behavior. Rats were trained to self-administer cocaine in the presence or absence of the LT during daily 3-hr sessions (maintenance). During Maintenance Days 5 and 10, rats underwent classical conditioning, whereby passive cocaine infusions were paired with either short-delayed, random, or no presentations of an LT. After extinction sessions, rats underwent test sessions in which the LT was presented in a noncontingent or response-contingent manner to measure conditioned cocaine-seeking behavior. The results demonstrated that response-contingent LT presentations significantly increased cocaine-seeking behavior and that the LT trained in a classical conditioning format transferred to an operant secondary reinforcer. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A Novel Class of Nitrogen‐rich Explosives Containing High Oxygen Balance to Use as High Performance Oxidizers in Solid Propellants

In this study, density functional theory (DFT) calculations and the best available reliable predictive methods are used to assess performance, thermodynamics, physical and sensitivity of several high nitrogen content energetic tetrazole derivatives. Detonation pressure and velocity of these compounds are greater than 470 GPa and 10.2 km/s, respectively. Furthermore, suitable methods are used to study the condensed phase heat of formation, Gibbs free energy of formation, heat of sublimation, heat of combustion, melting point, enthalpy of fusion, entropy of fusion, specific impulse, Gurney velocity, strength, deflagration temperature, impact sensitivity and shock sensitivity of the novel compounds. The predicted results of the new compounds are compared with the calculated and experimental values of N,N‐bis(1H‐tetrazol‐5‐yl)amine (HTBA), dihydroxylammonium 5,5′‐bistetrazole‐1,1′‐diolate (TKX‐50) and 1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine (HMX) as high performance energetic compounds.     

糖厂废蜜在高炉化学清洗中的应用

介绍了高炉化学清洗的成功经验,并对糖厂废蜜的酸洗缓蚀性能进行初步探讨.     

复合絮凝剂聚合氯化铝铁的制备及其对黄河水的絮凝作用

以摩尔浓度均为1 mol/L的AlCl3和FeCl3溶液为原料,在混合溶液中滴加NaOH溶液,聚合4 h,可制备聚合氯化铝铁(PAFC)。结果表明,经傅里叶变换红外光谱分析,证实PAFC中存在以羟基桥连的铁和铝的聚合物;将PAFC加入到500 mL黄河水中,在Al3 /Fe3 摩尔比为9∶2,碱化度为2.0,PAFC加入量为6 mg/L,黄河水pH值为6的条件下,浊度去除率达到99%以上;在黄河水中分别加入6 mg/L不同的絮凝剂,试样中絮状物沉降速率由快到慢依次为:PAFC,聚合氯化铝,FeCl3,FeSO4,AlCl3;浊度去除率依次为:99.3%,90.5%,79.6%,66.2%,54.7%。     

陶瓷内衬复合铜管的自蔓延高温合成

开发了离心自蔓延高温全成陶瓷内衬复合铜管制造工艺，研究了离心力和添加剂对复合铜管性能的影响。随着离心力增大，陶瓷层的孔隙度降低、压溃强度和压剪强度明显提高，离心力超过200G后，压剪强度反应而降低。铝热剂中加入SiO2也可降低孔隙度，提高压剪强度。提高铝热剂预热温度，可加快铝热反应速度，改善复合铜管质量。     

污水处理剂的综合评选实验研究

通过对江汉油田含油污水所进行的水处理剂综合评选实验,评选出了聚丙烯酰胺等3种絮凝剂、1种助絮凝剂、4种防垢缓蚀剂和2种杀菌剂以及较佳的净水条件,同时还得出了各种处理剂的加入顺序,经用综合评选出来的配方处理含油污水,其除油率达到100%,除铁率达到97.4%,除机械杂质达到97%,且溶解氧(DO),硫酸盐还原菌(SRB)、腐生菌(TGB)和结垢率均达到了部颁《注入水水质标准》,实验研究还为清污混注提供了有用的数据,证明各药剂配伍性很好。     

The location of inhibitory specificities in human mucus proteinase inhibitor (MPI): separate expression of the COOH-terminal domain yields an active inhibitor of three different proteinases

Human mucus proteinase inhibitor (MPI) consists of 107 aminoacids arranged in two domains showing high homology to eachother. This protein is an inhibitor of different serine proteinasesincluding trypsin, chymotrypsin, leukocyte elastase and cathepsinG. On the basis of sequence comparisons it has been suggestedthat the first domain inhibits trypsin, whereas the second onewas thought to be active against chymotrypsin and elastase.To prove the location of the different inhibitory activitiesgene fragments for both domains have been cloned separatelyand expressed in Escherichia coli. Inhibition assays with theisolated recombinant domains showed that the second domain isactive against chymotrypsin, neutrophil elastase and trypsin,whereas for the first domain only a weak activity against trypsincould be detected. These results suggest that the inhibitoryactivities of the native molecule towards these three proteinasesare all located in the second domain.     

铝塑复合板的发展现状与前景

简要的介绍了铝塑板在国外的发展概况；评述了国内铝塑板生产企业、原材料供应、应用和市场价格四方面情况。作者认为铝塑板是一种综合性能良好的新型装饰材料．目前处于快速增长阶段，预测到２０００年消费量将达 １８００万ｍ~２。由于国内现有生产能力已超过市场需求量，所以企业投资铝塑板项目应当慎重。     

Failure analysis of leakage current in plastic encapsulated packages

Plastic encapsulated packages exhibit high leakage currents after a few hundred hours in the steam pressure pot test (SPP). The present study investigates two possible causes of leakage current. These are: (a) mold compound, (b) the polyimide tape used for co-planarity of lead frame fingers. The results of this study indicate that the leakage cur-rent is independent of the frame and is not caused by the mold compound. The data indicates that it is the ionic content and acrylic-based adhesive layer of the polyimide tape which cause the leakage current. To eliminate the leakage current, polyimide tape with low ionic content and non acrylic-based adhesive should be used. *Permanent address: School of Physics, Universiti Sains Ma-laysia, 11800 USM Penang, Malaysia.     

天然橡胶防腐衬里自然硫化胶料的研制

简要介绍天然橡胶防腐衬里自然硫化胶料的基本配方、衬里的施工工艺及胶粘剂的情况。