相干处理光学系统的象质评价和计算程序

论述了相干处理光学系统的象质评价及波差判则,并给出设计相干光学系统的波象差计算程序。     

基体改进剂石墨炉原子吸收光谱直接测定饮料中的砷、铅、铜的研究

饮料是食品卫生监督检验的常测样品,饮料中的砷、铅、铜的含量是必测的指标。长期以来样品均采用酸式湿消化或碱式干灰化处理,分别用化学法测定,分析速度慢,方法的灵敏度也较低。近年来出现的基体改进剂石墨炉原子吸收光谱直接测定食品中铅和铜的方法,使分析速度和灵敏度都有了很大提高。但在食品中直接测砷却遇到很大的困难,砷是允许灰化温度最低的元素,在食品样品中,由于有大量有机物的作用,使它更容易损     

全合成海南粗榧新碱类似物的研究

海南粗榧新碱具有一定的抗肿瘤活性，为了提高该类化合物抗肿瘤活性，研究其结构与活性的关系，以３，４－二甲氧基苯乙酸和脯氨醇为起始原料，经７步反应得到消旋的海南粗榧新碱类似物，并经酒石酸拆分得到ｅ．ｅ．值分别为９３％和９５％的一对对映体，经各种光谱及Ｘ－衍射证实其结构。     

Characteristics of lubrication at nanoscale in two-phase fluid system

Thin film lubrication (TFL) is a condition in which the lubricating features between two surfaces in relative motion are determined by the combination of the properties of the surfaces and the lubricant and viscosity of the lubricant. The effects imposed by couple stress on lubrication characteristics cannot be disregarded in this regime where the ordered molecules dominate the fluid field. There are different tensor measures and constitutive equations in this case other than Newtonian case. The lubrication of two-phase (solid phase and liquid phase) fluid is investigated in this paper. The existence of couple stress will enhance the lubricant viscosity and hence increase the film thickness and improve the load-carrying capability. Size-dependent effects can be seen in the lubrication with couple stress, and the thinner the lubricating film is, the more obvious the effect will be.     

石墨炉AAS中气体直接进样技术的研究——氢化物法测定As、Sb、Bi、Sn、Ge和Pb

本文提出将气体样品经石墨炉的载气入口由载气直接引入石墨炉的技术,实现了石墨炉原子吸收光谱中气体样品的直接进样测定,并成功地应用于氢化物气体的分析,测定了砷、锑、铋、锡、锗和铅,其灵敏度为2.0×10~(-9)g～8.1×10~(-10)g;检出限为2.1×10~(-9)g～6.0×10~(-11)g;线性范围上限为30μg/1～400μg/1;精密度(R.S.D)为0.76%～2.4%。     

二（1N-苄基-苯并咪唑）二氯合钴配合物的晶体结构、电化学和热稳定性能研究(英)

0IntroductionBenzimidazoleisaninterestingheterocyclicringbecauseitispresentinvariousnaturallyoccurringdrugs,suchasomeprazole,astemizoleandemedastinedifumarate[1].Theefficacyofsubstitutedbenzimida鄄zolesinthetreatmentofparasiticinfectionsiswellknown[2,3].B…     

石墨炉AAS法直接测定食品中铅、镉、锰、铜和铬

食品中铅、镉、锰、钢和铬的测定是食品卫生监测的常作项目。目前主要采用酸消化或高温灰化样品,化学法测定,比较耗时。本文介绍以磷酸为基体改进剂,用石墨炉原子吸收(AAS)直接进样测定食品样品中上述五个元素,对于能与水互溶的液体样品,易溶于水的固体样品以及用水制成悬