钢纤维混凝土受拉性能实验方法研究

在分析国内外钢纤维混凝土受拉性能实验研究存在困难的基础上,提出了新的实验方法——钢纤维混凝土环状试件,在内油压作用下的受拉性能实验研究。通过实验装置的合理设计及正确的实验步骤,成功地测出了钢纤维混凝土环状受拉应力－ 应变全过程曲线,为深入研究钢纤维混凝土受拉性能提供参考依据。     

An ab initio study on the vibrational and electronic spectra of the molybdenum–sulfur clusters with Mo2OnS4−n(n=0–4) core

Using the ab initio method, the vibrational and electronic spectra of binuclear molybdenum clusters which contain Mo₂O_nS_4−n(n=0–4) core were investigated. The main absorption bands in the IR spectra of these clusters are assigned and compared with each other, especially for the case of the trans isomers. The electronic spectra were studied by performing the CIS calculations. The ground state and the first excited state of the clusters were discussed by using the natural bond orbital method. It is shown that the band corresponding to the longest wavelength can be assigned to three kinds of transition types. Two transitions, σ(Mo–Mo)→π*(Mo–X_t)(X=S,O) and σ(Mo–Mo)→σ*(Mo–Mo), can be seen in most cases.     

硫酸镁的临床新用途

镁是人体必需元素之一。镁参与生命活动的所有重要方面,是细胞新陈代谢中各种酶系统的重要活化剂。硫酸镁为泻药和利胆药,近年来发现其具有治疗肺炎、肺心病、冠心病、高血压、胃十二指肠溃疡、急性腹泻、急性肾炎、偏头痛、破伤风和婴儿手足搐搦症等新用途。常用２５％硫酸镁１０～４０ｍＬ,用５％葡萄糖注射液稀释成１％浓度缓慢静滴。     

鸦片的气相色谱快速分析

采用大口径毛细管柱,建立了一种气相色谱测定鸦片中生物碱的快速分析方法。样品经超声提取,ＨＰ－１（５ｍ×０．５３ｍｍ×２．６５μｍ）毛细管色谱柱,ＦＩＤ测定。回收率为９６．８％￣１０１．１％,相对标准偏差均小于３％。方法简便,快速,准确,灵敏。     

氟、氯和甲基取代丁二酰亚胺的结构、红外光谱和热力学性质的密度泛函理论研究

用密度泛函理论(DFT)的B3LYP方法(6-31G^*基组),计算研究了丁二酰亚胺(SIM)的氟、氯和甲基取代物(SIMF,SIMCl和SIMMe)的几何构型、电子结构、红外光谱和热力学性质,讨论了取代基效应.结果表明,SIMF和SIMCl均为平面构型,SIMMe接近平面构型.羰基伸缩振动频率(νC=O)均分裂为两个谱带,低频带出现在1734～1771cm^-1,高频带出现在1792～1822cm^-1,且前者强于后者.与SIM相比,吸电子基(F和Cl)使νC=O和偶极矩增大,推电子基(CH₃)的影响正相反.由校正频率计算了298～800K温度范围的热力学性质熵(S°)和热容(C_p°).     

Analysis of Components of Fatty Acids and Determination of Methyl Hexade Canate in Honeycomb

Honeycombs are nests of polistes olistes olivaceous, polistes japonicus saussure or parapolybia varia Fabricius. They can drive out wind, attack toxicity, kill microbe,restrain ache, accelerate blood coagulation, strengthen heart beats and reduce blood pressure.They have been used as the important ingredient in the treatment of cancer in recent years. Honeycomb contains a number of chemical ingredient, mainly of beewax, resin and volatile oil.Though honeycomb have been widely used in the medicine,the components of fatty acids in honeycomb oil and the controlling method of quality of honeycomb have not been reported. GC/MS method for the qualitative and quantitative analysis of fatty acids in honeycomb oil have been adopted in this report and the method with analyzing methyl hexade canate in honeycomb are set up in order to exploit and use better honeycombs.     

G蛋白偶联受体34同源建模及其与lysoPS类似物对接研究

G蛋白偶联受体34(GPR34)在肥大细胞、肿瘤组织和人体免疫器官中高度选择性表达,但因属于膜蛋白,其三维结构难以测定,不能从分子水平上分析其与药物作用情况.本文选用PDB数据库中与GPR34一级序列同源性最高的4NTJ为模版蛋白进行同源建模,运用拉氏图和Profile-3D进行评估,通过加膜限制和loop区能量优化等...     

Comparison of Atmospheric Pressure Chemical Ionization and Electrospray:Determination of Monogalactosyl Diacylglycerols from Cyanobacteria by Liquid Chromatography/Mass Spectrometry

Atmospheric pressure chemical ionization (APCI) and electrospray (ES) mass spectrometry (MS) in both positive and negative ionization modes coupled to high-performance liquid chromatography (HPLC) have been used for the characterization of monogalactosyl diacylglycerols (MGDG) from cyanobacteria Anabaena cylindrica and Aphanizomenon flos-aquae.     

GC/MS of Trimethylsilylated Derivatives of Dialkylglycerol Ethers from Archaebacteria Halobacterium salinarium

Although LC-MS in off-line (FAB) or on-line (ESMS) was widely used to investigate lipid structures, the classical GC/MS has great advantage in determination of the structures of long alkyl chain lipids in Archaebacteria. It supplies extensive fragmentation for each separated component.     

A Study of Polarographic Adsorption Catalytic Wave of Trace Amounts of Yttrium

Determination of single rare earth element is relatively difficult since the properties of rare earth elements are so similar. Determination of trace amounts of yttrium in rare earth ores by adsorption catalytic polarographic has not been reported. In this paper, after several experiments, it is found that in NH₃-NH₄CL buffer solution which pH 9.2,yttrium, pyrocatechol violet(PV), 1.lO-phenanthroline(phen) and cetyltrimethylammniu bromide-(ClMAB) may form stable tetrabasic complex, which can produce penetrating and sensitive adsorption catalytic polarographic wave on multiple functional polarograph of PAR 384B-4.