光学系统杂光测量与计算程序间的联系

根据光学衍射成像理论,建立了黑斑法测量光学系统杂光的杂光系数解析式.该解析式包括了被测系统的结构参数和测试条件两部分.并编制了计算程序,将计算值和测量结果进行了比较,两者较为一致.     

丙烷为碳源制备碳化钼催化剂及其噻吩HDS性能研究

金属碳化物因其具有类似贵金属的催化性能引起国内外研究者的广泛关注.钼基金属碳化物在烃类加氢、脱氢、异构化、氨合成和分解及加氢脱氮等方面表现出优良的性能,被认为是很有前景的催化活性物种.由金属前体和气相渗碳剂在程序升温条件下反应,是制备金属碳化物最为常用的方法.为获得结构可控、表面可精确调变的催化剂,渗碳剂的选择至关重要.     

Synthesis,Crystal Structure and Antitumor Activities of 1,2,3,4-Tetrahydroquinoline-2,4-diyl(bisdiphenylphosphine oxide) Derivatives

A novel and efficient Ir-catalyzed 1,4-and 1,2-addition of diphenylphosphine oxide to quinolines was developed to obtain various 1,2,3,4-tetrahydroquinoline-2,4-diyl(bisdiphenylphosphine oxide) derivatives. The structures of these derivatives were characterized by H-RMS and NMR analysis. X-ray crystallography showed that 3 a is in a monoclinic system, space group of P2_1/c with a = 13.0464(16), b = 12.6244(16), c = 20.210(3) ?, β = 105.215(2)o, V =3211.9(7) ?~3, Z = 4, F(000) = 1352, μ = 0.42 mm~(–1), S = 1.07, the final R = 0.059 and wR = 0.195.The in vitro antitumor activities of target compounds were evaluated by MTT assay against human cancer K562, HL-60, HeLa and BGC-823. The target compounds demonstrated weak or moderate antitumor activity against these cell lines.     

原子吸收法间接测定生物样品及食品中的还原糖

对于糖的测定,目前国内外均采用斐林法、碘量法、分光光度法及离子选择电极法等。本文研究了用原子吸收法测定被糖还原的 Cu_2O 的量间接测定还原糖含量的实验条件,并用于葡萄糖中间体、成品、桔子汁、蔬菜、酱、醋、蜂蜜及人体血液等样品中还原糖含量的测定。其线性范围0.05—3mg,回收率98—101%,变动系数1%。本工作是在 pH约为11的碱性介质中,以还原糖将柠檬酸铜络合物     

真空热抽取气相色谱法快速测定氢

本文报导色谱法测定金属中氢的新型真空系统。它采用两台立式四级油扩散泵及分取取样器,简化了真空系统,避免使用汞扩散泵,麦氏真空计,托氏泵,液氮等,使工作人员摆脱了汞蒸气的毒害,同时提高了分析速度。气体提取后,以氩气作载气,流速20毫升/分,分离柱用5埃分子筛,柱温,60℃,热丝电流80毫安,色谱测定。本法对钛、锆合金中氢的测定进行了试验,并和其他方法对照,证明本法快速、准确,也可同时测定其他金属中     

抗坏血酸分析方法的探讨—间接原子吸收法

抗坏血酸(以下称VC)是人类生存不可缺少的一种重要维生素。对VC的测定,多采用氧化还原滴定法、比色法、分光光度法。Kidani、Al-Zamil曾提出溶剂萃取-原子吸收法、沉淀-原子吸收法测定VC。但其操作烦琐,反应条件苛刻或线性范围窄,干扰多。本文提出了在弱酸性强电解质溶液中,还原性的VC与二价铜反应,生成CuSCN沉淀,离心分离后,测定沉淀中铜量来间接测定VC含量的原子吸收法。本法具有线性范围宽(30—     

火焰原子吸收分光光度法测定洗发液、护发液中的铅

建立了一种准确测定洗发、护发用品中铅含量的火焰原子吸收分光光度检测方法,样品用硝酸-高氯酸-硫酸于高温下消解后,在优化的仪器操作条件下进行含量测定,在0~10.00μg/mL内,线性方程为A=0.017 9c 0.001 4,相关系数为0.999 5。4种样品3个不同添加水平试验铅的回收率为86.4%~100.7%,测量结果的相对标准偏差为1.3%~2.2%,铅的检出限为0.017μg/g。     

电位滴定法测定硼硅玻璃中的硼和计算机在数据处理中的应用

本文研究了硼的电位滴定条件,提出了测定硼硅玻璃中较高含量的硼的新方法。所用滴定剂为十六烷基三甲基溴化铵,指示电极为氟硼酸根离子选择电极。数据由计算机处理,自动求算二阶微商以确定终点,避免了作图的麻烦与误差,使方法简便、快速、准确。方法的检测限为8×10~(-5)M,相对标准偏差为0.43％,相对误差为-0.23％.     

电沉积ZrO2—Ni功能梯度材料的组织结构分析

电沉积ＺｒＯ２┐Ｎｉ功能梯度材料的组织结构分析①全成军＊向兴华朱景川尹钟大（哈尔滨工业大学材料科学与工程学院哈尔滨１５０００１）航空航天技术的高速发展对材料的耐热性能提出了更苛刻的要求，传统的单一材料（如陶瓷、金属）和金属陶瓷复合材料已难以在超高温和...     

A COMPARISON OF DENATURATION AND INACTIVATION RATES OF CREATINE KINASE IN GUANIDINE SOLUTIONS

Both the denaturation, as followed by UV absorbance and fluorescence changes, and inac-tivation of creatine kinase in guanidine solutions have been found to be first order reactions.In 3 M guanidine, at 30℃, the inactivation rate constant was found to be 5.9 sec~(-1) and thedenaturation rate constant 1.9 sec~(-1). At lower guanidine concentrations, the inactivation rateconstants were only little affected whereas the denaturation rate constants decreased markedly,being of the order of 0.04 in 1 M and 0.004 in 0.5 M guanidine. The kinetics of the inactiva-tion reaction in 0.5 M guanidine was found to be in agreement with a combination of two firstorder reactions. The enzyme lost activity first by a fast reaction with a rate constant onlyslightly lower than the rate constant in 3 M guanidine followed by a slower reaction with a rateconstant of 0.003 sec~(-1). In 0.3 M guanidine, very little change in either UV absorbance or influorescence was observed, but, in sharp contrast, the enzyme lost considerable activity by a fastreaction and this was followed by a slower reaction of inactivation. Even after prolongeddenaturation in 0.5 and 0.3 M guanidine, residual activities of 3.4% and 30% remained res-pectively. The above results suggest a very fragile active site although dissociation of thedimer and reversible guanidine inhibition may also contribute to the initial rapid inactiva-tion. It is also to be noted that the multiphasic courses of inactivation at lower guanidineconcentrations seem to suggest the presence of partly active intermediates during denaturation.