Synthesis and Structural Characterization of Adduct [La(NO_3)_3·4H_2O]·2(BQEB)

Differentkindsofopenchaincrownethershavebeensynthesizedasthemodelcompoundsofionophoresandtheirinteractionswithsodium,potassiumandrareearthionshavealsobeenstudiedl'z.PanshowedCe(III)yieldedalf1complexwithl,8-bis(8'-quinolyloxy)-3,6-dioxaandtheCe(IIl)ioncoordinatedbothtoetheroxygenandquinolinenitrogenatoms3.TUmInleridentifiedtwolanthanidenitratecomplexeshavingastoichiometryof3:2(3RE:2L)'.InordertostUdythefunctionsofbothquinolineandbenzenering,introducedintothepolyetherchain,a1inearpolyether…     

Sample-path optimization of convex stochastic performance functions

In this paper we propose a method for optimizing convex performance functions in stochastic systems. These functions can include expected performance in static systems and steady-state performance in discrete-event dynamic systems; they may be nonsmooth. The method is closely related to retrospective simulation optimization; it appears to overcome some limitations of stochastic approximation, which is often applied to such problems. We explain the method and give computational results for two classes of problems: tandem production lines with up to 50 machines, and stochastic PERT (Program Evaluation and Review Technique) problems with up to 70 nodes and 110 arcs. Sponsored by the National Science Foundation under grant number CCR-9109345, by the Air Force Systems Command, USAF, under grant numbers F49620-93-1-0068 and F49620-95-1-0222, by the U.S. Army Research Office under grant number DAAL03-92-G-0408, and by the U.S. Army Space and Strategic Defense Command under contract number DASG60-91-C-0144. The U.S. Government has certain rights in this material, and is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. Sponsored by a Wisconsin/Hilldale Research Award, by the U.S. Army Space and Strategic Defense Command under contract number DASG60-91-C-0144, and the Air Force Systems Command, USAF, under grant number F49620-93-1-0068. Sponsored by the National Science Foundation under grant number DDM-9201813.     

产生短间隔高精度纳秒激光双脉冲的实用电路

本文介绍了我们研制的“运动粒子瞬态激光全息测试仪”电子线路.该电路经严格的逻辑设计及计算,采用了10MHz时钟电路,并将1MHz的时钟信号巧妙地引入门控电路中,同时在技术上采用了行之有效的措施,消除了可能产生0.1μs的随机误差,时间间隔达到了(1～9)±0.1μs的精度,所输出的激光双脉冲能量接近,整机抗干抗能力强,一次性试验成功率高,可精确地测量雾化粒子场中的微粒的速度、形状、大小及其分布,收到了良好的使用效果.     

液相色谱法测定地质样品中的芳香化合物

发展了用液相色谱法检测地质样品中芳香化合物的方法。对观察到的色谱峰进行了定性分析，了该法对油气地球化学勘探的意义。     

平衡聚合反应产物分子量分布参数的确定

<正> 四氢呋喃的阳离子型聚合反应和α-甲基苯乙烯的阴离子型聚合反应都是平衡聚合反应。Tobolsky等已经对平衡聚合反应动力学作了很多研究,认为该反应的产物具有Flory分布。但尚未确定上述分子量分布函数的参变数与哪些因素有关,因此该公式的应用受到限制。近年来,平衡聚合反应的研究蓬勃展开,其反应动力学理论显然也须进一步完善,以便可以通过反应条件来预测,调节和控制反应产物的平均分子量和分散     

Chiral Salen Manganese Complex Immobilized on SBA-15： A New Heterogenized Enantioselective Catalyst for the Epoxidation of Alkenes

Jacobsen‘s catalyst was immobilized onto SBA-15 by multi-step grafting, and this heterogenized catalyst exhibited comparable catalytic performance with the corresponding homogeneous counterpart for the epoxidation of alkenes, and the catalyst could be recycled effectively several times.     

Studies on Solid State Reactions of Coordination Compounds（LXXI）──Solid State Reactions of o－Aminobenzoic Acid with Copper（Ⅱ） Acetate and Formate at Room Temperature

ＳｔｕｄｉｅｓｏｎＳｏｌｉｄＳｔａｔｅＲｅａｃｔｉｏｎｓｏｆＣｏｏｒｄｉｎａｔｉｏｎＣｏｍｐｏｕｎｄｓ（ＬＸＸＩ）──ＳｏｌｉｄＳｔａｔｅＲｅａｃｔｉｏｎｓｏｆｏ－ＡｍｉｎｏｂｅｎｚｏｉｃＡｃｉｄｗｉｔｈＣｏｐｐｅｒ（Ⅱ）ＡｃｅｔａｔｅａｎｄＦｏｒｍ...     

大孔吸附树脂负载氢氧化锰作催化剂空气氧化水中硫化物的研究

采用ＮＫＡ２型大孔吸附树脂负载氢氧化锰作催化剂，研究模拟水样中硫化物的空气氧化过程和影响因素，并对煤气和焦化工业含硫废水进行氧化试验．结果表明，在ｐＨ９～１１和不低于３０℃的条件下，浓度６３０～３８００ｍｇ／ｌ的Ｓ２－可在１～３小时内达到９９％的氧化率，树脂负载催化剂可重复使用．