FREE DEFORMATION RETRACTION IN INJECTIVE METRIC SPACES

In this paper the authors establish the concept of generalized ball-intersection (GBI) and prove that an injective metric space is freely contractible to its each GBI, which generalizes a result of Isbell from a point to a GBI.     

Synthesis of Trihydrocarbyltin Chloride Containing Silicon and Crystal Structure of (p-Cl-C6H4Me2SiCH2)3SnCl

IntroductionThe drug- molecules are called as silyl- drug ifasilicon atom replaced one carbon atom of theorganic- drugs.Generally,they have low toxicityand pro- long efficiency.Many methods have beendesigned in order to decrease the toxicity oforganotin compounds and organosilicon which hasbeen proved to be effective.Torque[1] is a newacaricide made by America Shell Company,itsmolecular formula is [( Ph Me2 Si CH2 ) 3 Sn]2 O.Tacker[2 ] synthesized the compounds( Ph Me2 Si CH2 ) 3 Sn X[…     

催化动力学光度法测定锅炉给水中异抗坏血酸钠

基于催化动力学过程，研究了新型锅炉给水除氧剂异抗坏血酸钠的分光光度法测定。试验表明，这一方法操作简便，快速、准确提高，可测至5μg.L^-1异抗坏血酸钠。     

Studies on Lead(Ⅱ) Complexes of Ferrocenylaldehyde Aroylhydrazones

ＩｎｔｒｏｄｕｃｔｉｏｎＯｗｉｎｇｔｏｔｈｅｆｏｒｍａｔｉｏｎｏｆｓｔａｂｌｅａｎｄｄｅｅｐｌｙｃｏｌｏｒｅｄｃｏｍｐｌｅｘｅｓｗｉｔｈｈｅａｖｙｍｅｔａｌｉｏｎｓ（ｓｕｃｈａｓｌｅａｄ（Ⅱ）ｅｔｃ）,ｔｈｅｆｅｒｒｏｃｅｎｙｌａｒｏｙｌｈｙｄｒａｚｏｎｅｓａｒｅｎｏｔｏｎｌｙｐｏｔｅｎｔｉａｌｌｙｕｓｅｆｕｌａｓｓｐｅ－ｃｉｆｉｃｒｅａｇｅｎｔｓｉｎａｎａｌｙｔｉｃａｌａｎｄｅｘｔｒａｃｔｉｖｅｃｈｅｍｉｓｔｒｙ［１］ｂｕｔａｌｓｏｓｔｒｏｎｇｌｙａｃｔｉｖｅｂｉｏｌｏｇｉｃａｌｌｙ,ａｎｄｃ…     

Study of Static Adsorption Capacity of ACF for Xenon at 201 K

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒａｄｉｏｘｅｎｏｎｓａｒｅｎｕｃｌｅａｒｆｉｓｓｉｏｎｐｒｏｄｕｃｔｓ .ＡｃｃｏｒｄｉｎｇｔｏｔｈｅＣｏｍｐｒｅｈｅｎｓｉｖｅＮｕｃｌｅａｒ Ｔｅｓｔ ＢａｎＴｒｅａｔｙ (ＣＴＢＴ) ,ｔｈｅｎｕｃｌｅａｒｅｖｅｎｔｓｗｈｉｃｈｖｉｏｌａｔｅｔｈｅｔｒｅａｔｙｍａｙｂｅｆｏｕｎｄｂｙｍｏｎｉｔｏｒｉｎｇｒａｄｉｏｘｅｎｏｎｓｉｎｇｌｏｂａｌａｔｍｏｓｐｈｅｒｅｗｉｔｈＩｎｔｅｒｎａｔｉｏｎａｌＭｏｎｉｔｏｒｉｎｇＳｙｓ ｔｅｍ(ＩＭＳ) .Ｈｏｗｅｖｅｒ ,ａｌｌｘｅｎｏｎｓ…     

断裂面及表面裂纹的分形研究

本文介绍了表面裂纹的分形特性和近年来有关裂纹成型机理的一些进展．     

7-芳基-10-芳基(甲基)-8, 9, 10, 11-四氢苯并[c]吖啶酮-8的 合成

本工作合成了一系列尚末见报道的四环系苯基并吖啶酮类化合物。     

3－芳基－1（2H，4H）－吖啶酮衍生物的合成及其镇痛作用

３－芳基－１（２Ｈ，４Ｈ）－吖啶酮衍生物的合成及其镇痛作用韩光范，魏永慧，尹荣王进军姜贵吉（吉林医学院检验系吉林１３２００１）（吉林化工学院精细化工系吉林）（延边大学化学系延吉）关键词吖啶酮衍生物，合成，镇痛作用吖啶及吖啶酮类化合物具有抗疟、抗菌、抗...     

Directed Evolution of Human Cu,Zn-SOD Under Artificial Oxidant Pressures

IntroductionSuperoxide dismutases play an important rolein organisms′ defense against highly reactiveoxygen species by removing the superoxideanions[1— 3 ] . According to their metal cofactor,three differentclasses of superoxide dismutases canbe distinguished:Cu,Zn- SOD,Fe- SOD and Mn-SOD. These three SODs are different in thephylogenetic distribution pattern,prokaryotescontain Mn- SOD,Fe- SOD or both,and Cu,Zn-SODs in the cytosol and peroxisomes of eukaryotesand homologous prote…     

一种水中可溶性导电聚苯胺的制备与表征

分别以聚乙二醇(PEG)的水、乙醇溶液为反应媒介, 制备了Keggin结构杂多酸(H₄SiW₁₂O₄₀)掺杂的导电聚苯胺材料. 此聚苯胺经IR, XRD, UV-Vis光谱进行了表征, 并采用标准的四探针法对其电导率进行了测定. 同时系统地研究了杂多酸、氧化剂和单体的比例、反应混合体系温度的改变等对所合成聚苯胺的产率、导电率、水中溶解性等方面的影响. 结果表明, 在PEG乙醇溶液中制备的聚苯胺比在水溶液中制备的有较高的产率、电导率和溶解率. 其最高电导率可达到1.87 S/cm, 溶解率可达53%.