大肠杆菌HB101感受态细胞的显微观察与分析

对数生长前期的大肠杆菌在生理盐水中用CaCl2可以直接诱导建立感受态并完成转化过程。利用H－8100透射电子显微镜观察用CaCl2直接在生理盐水中诱导建立感受态的大肠杆菌细胞，发现感受态细胞整体电子密度趋于均匀，但存在有电子密度较高颗粒，表明大肠杆菌感受态建立过程中，细胞整体对电子通透性增强，可能存在涉及细胞膜通透性的复合物重新形成相关的胞内物质代谢及其在细胞内定位的受控改变，暗示大肠杆菌可能具有建立自然感受态的能力。     

入射角和薄片表面特性对激光干涉测温的影响

以激光干涉为理论基础,采用具有不同表面光学特性的单晶硅片和K-8光学玻璃为样品,针对不同的测量条件,研究干涉条纹对比度变化对温度测量的影响.分析了薄片干涉条纹对比度与测量光束直径、入射角、样品表面粗糙度以及表面镀膜之间的相互关系,研究了薄片的横向温度梯度对干涉对比度的影响.实验结果表明,上述各因素对温度测量参量对比度产生的影响具有规律性,并在一定对比度阈值条件下,能够满足精确测温的条件要求.     

农药丁吡吗啉与腐殖酸作用机理探讨

探讨农药丁吡吗啉与腐殖酸的作用机理, 可进一步了解农药在土壤中腐殖酸催化下降解的行为过程。将市售腐殖酸进行逐级分离,获得黄腐酸、棕腐酸和黑腐酸的固态或溶液状态,而后分别与农药丁吡吗啉进行作用,利用红外,荧光两种分析方法对其作用机理进行了解释。结果表明,三组分与丁吡吗啉之间广泛存在范德华力、次级键等弱作用力。黄腐酸与丁吡吗啉之间存在氢键和电荷转移吸附等作用力,棕腐酸与丁吡吗啉存在电荷转移吸附等作用力,黑腐酸与丁吡吗啉之间的作用力最弱,即依照黄腐酸、棕腐酸、黑腐酸三组分平均分子量依次递增的顺序,与农药丁吡吗啉之间的作用力依次降低。     

Steady-state responses of mechanical system attached to non-smooth vibration absorber with piecewise damping and stiffness

Meccanica - The steady-state dynamic characteristics of non-smooth vibration absorbers are investigated. The complexification-averaging method is used to obtain the steady-state response equation...     

亚纯函数的一个正规定则

We proved:Let F be a family of meromorphic functions in a domain D and a≠0,b∈C.If f′(z)-a(f(z))~2≠b,f≠0 and the poles of f(z)are of multiplicity＞=3 for each f(z)∈F,then F is normal in D.     

GPS测姿技术在航天测量船的应用分析

简要介绍了航天测量船测姿系统的特点,概要分析了GPS测姿技术的原理,着重论述了GPS测姿技术在测量船上应用的可行性。     

一种新S曲线的建议

对于一元非线性回归计算,各种著作中均给出不同的线型及其相应的公式和线性化后的方程,供试验研究和工程、非工程计算中使用.S曲线的使用较为广泛,但它是一条不通过坐标原点的曲线,这与实际有出入,且尚欠合理.作者建议一条通过原点的S曲线,使之更符合实际.     

中国煤中铍的分布赋存特征研究

根据对中国不同矿区1018个煤层煤样和生产煤样铍含量数据的统计结果,分析了中国不同成煤时代、不同聚煤区煤中铍的分布特征。同时,根据对10个不同煤田煤样的实验室浮沉试验、煤岩分析等试验研究,运用Solari方法,计算了煤中各组分中铍的理论含量,讨论了中国煤中铍的赋存特征,尤其是铍在各种煤岩组分中的分布。研究表明,铍在煤中富集程度较高,但相对于世界煤中平均水平来说,中国煤中铍含量总体水平较低。煤中铍主要赋存于惰质组及伊利石粘土矿物中,在镜质组及其它矿物中含量较低。同时,中国大多数煤中铍的有机亲和性指数较高,不利于选煤过程中铍的脱除。     

SYNTHESIS AND CHARACTERIZATION OF BIS-[2-[[（2- ALKOXYPHENYL）IMINO]METHYL]-PHENOLATO-O,N,O]NICKEL（Ⅱ） COMPLEXES AND THEIR NORBORNENE POLYMERIZATION

A series of salicylaldimines, synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes. These nickel complexes were carefully characterized, and the solid structure of la was elucidated by X-Ray diffraction. Activated with MAO, the nickel complexes showed good activity for homopolymerization of norbornene. Reaction parameters, such as the ratio of nickel precursor to MAO, monomer concentration, reaction time and the reaction temperature, as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene.     

SYNTHESIS AND CHARACTERIZATION OF BIS-[2-[[(2-ALKOXYPHENYL)IMINO]METHYL]-PHENOLATO-O,N,O]NICKEL(II)COMPLEXES AND THEIR NORBORNENE POLYMERIZATION

A series of salicylaldimines,synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes.These nickel complexes were carefully characterized,and the solid structure of la was elucidated by X-Ray diffraction.Activated with MAO,the nickel complexes showed good activity for homopolymerization of norbornene.Reaction parameters,such as the ratio of nickel precursor to MAO,monomer concentration,reaction time and the reaction temperature,as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene.