AN ITERATIVE METHOD FOR THE MINIMAX PROBLEM

In this paper a class of iterative methods for the minimax problem i; proposed.We present a sequence of the extented linear-quadratic programming (ELQP) problems as subproblems of the original minimal problem and solve the ELQP problem iteratively.The locally linear and su-perlinear convergence results of the algorithm are established.     

大孔吸附树脂分离纯化杜仲中活性成分

比较了AB-8．NKA-9．NKA-11．D-140．D-101．HPD-600、S-8及聚酰胺等8种吸附树脂对杜仲中的活性成分京尼平甙和松脂醇二葡萄糖甙的吸附及脱附性能．在静态吸附研究的基础上，筛选出效果较好的树脂进行动态实验研究．实验表明：最佳的同时分离纯化松脂醇二葡萄糖甙和京尼平甙的树脂为S-8．并进行了该树脂对杜仲中两种活性成分的吸附和脱附研究，确定了最佳的工艺参数。     

Beitrag zur Polymorphic organischer Substanzen

Zusammenfassung Es wurden 15 organische Verbindungen angegeben, bei denen Polymorphie gefunden wurde. 10 davon wurden näher beschrieben, wobei für die Untersuchungen thermomikroskopische, differential- scanning-calorimetrische und IR-spektroskopische Methoden verwendet wurden. Ausführlicher beschrieben wurden 1-Adamantyl-essigsäure, Äthylendiamintetraacetonitril, N-Äthylthioharnstoff, Benzilsäuremethylester, Benzylmalonsäure, Biphenyl-2-carbonsäure, Bis-(cyklohexanon)-oxaldihydrazon, l,4-Bis-[2-(4-methyl-5-phenyl)-oxa-zolyl]benzol, Butyloxycarbonyl-L-alanin-4-nitrophenylester und 3,3-Dimethylglutarsäure.

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Contribution to the polymorphismn of organic substances

Summary Fifteen organic substances in which polymorphism was found are specified. Ten of these were described in detail. Thermomicroscopic, differential scanning calorimetric and IR spectroscopic methods were used for the investigations. 1-Adamantylacetic acid, ethylene diamine tetracetonitrile, N-ethylthiourea, benzyl acid methyl ester, benzyl malonic acid, biphenyl-2-carbonic acid, bis-(cyclohexanone)-oxaldihydrazone, l,4-bis-2-(4-methyl-5-phenyl)-oxazolyl benzene, butyloxycarbonyl-L-alanine-4-nitrophenylester and 3,3-dimethylglutaric acid are described in more detail.

     

Mineral?lprodukte

Ohne Zusammenfassung     

Neue Chlorsilyl- und Alkoxysilyl-alkyl-peroxide

The alkyl-chlorosilyl-peroxides1 and2, the alkoxysilylalkyl-peroxides3 to7 (Table 1) as well as the hitherto unknown chlorosilanes (n-PrO)Me ₂SiCl and (t-BuO)Me ₂SiCl were prepared, isolated and characterized by analytical and¹H-NMR data. Attempts to isolate the unstable peroxides (i-PrO)₃SiOOCMe ₃ and (Me ₃CO)Me ₂SiOOCMe ₂ Ph failed.     

纤维素硝酸酯接枝物的FTIR光谱

作者对纤维素硝酸酯与聚甲基丙烯酸甲酯接枝共聚物的FTIR光谱进行了比较全面的定性与定量分析,并探索其在接枝共聚研究中的某些应用。     

用扫描电镜研究工程塑料的断裂行为

本文研究了工程塑料——聚碳酸酯及聚对苯二甲酸丁二醇酯的微观断裂行为。研究中采用了静载和动载破断实验,用扫描电镜观察断裂形态特征,并结合宏观力学试验过程分析其断裂行为。实验结果表明,热塑性工程塑料,在加载速率及环境温度固定条件下,其微观断裂行为受材料损伤体积空间分布的影响,材料损伤体积宏观空间分布范围宽,则大分子相互协同动作强,应变均匀,微观塑性形变差别小,断口表面趋于平坦;反之,大分子相互协同动作差,应变易于集中,微观塑性形变差异大,断口表面高低起伏大。     

Electrochemical Studies on the Interactions of Dipyridophenazine Complex of Ruthenium and Herring Sperm DNA

Cyclic voltammetry (CV) and single-step chronocoulometry were used to study the interaction of [Ru(phen)2dppz]2 (phen=l,10-phenanthroline; dppz=dipyrido[3,2-a:2‘,3‘-c]phen-azine) with herring sperm DNA. The addition of DNA caused a diminution in the peak current and a positive shift in the peak potential of the complex of [Ru(phen)2dppz]2 . The 12 mV positive shift in the peak potential of [Ru(phen)2dppz]^2 indicates that [Ru(phen)2dppz]^2 binds 2.6 times more strongly to DNA than its reductive form. In addition, by using fluorimetric and UV-spectrophotometric methods and studies of denatured DNA and the effect of NaC1 solution, it was also found that the binding mode was intercalation. The decrease of peak current is proportional to the concentration of DNA, which can be applied to estimate DNA concentration.     

盐酸煮沸提取和ICP-AES测定植株中矿质元素

本文研究了用4N盐酸煮沸提取植株中的K、Na、Ca、Mg、P、Cu、Zn、Fe、Mn、Sr、Ba和B的实验条件。浸提液用ICP-AES测定,获得了满意的结果。方法简单、操作简便、安全。与硝酸-高氯酸湿消化法进行了对照,结果非常一致,除硼外十一种元素都不存在显著差异。并测定了国家级标准甘兰物质GBW 08504,其结果与标准值相符。