大口径毛细管柱拟柱上进样衬管的研制

进样口衬管是气相色谱仪进样口的重要部件，样品的分离效果、定量的可靠性与重现性都与进样方法及进样口衬管息息相关。岛津GC—17A所配的大口径毛细管柱的直接进样衬管死体积较大，为克服衬管死体积引起进样谱带展宽的缺点，厂商建议使用的线速度远高于大口径平均最佳线速度，由于国内大多数色谱用户使用N2作载气，这就必然是在牺牲更多柱效的情况下进行色谱分析。柱上进样方式是弥补上述缺点的有效方法。但无论是柱上（on column）进样或改进的柱上（at column）进样装置均较复杂。我们研制了一种简易的（热）拟柱上进样衬管，可以直接安装在色谱仪器的填充柱进样口，在最佳线速度下分析样品，充分发挥大口径柱的柱效，分离效果基本与分流进样一样。     

Synthesis,Crystal Structure,Vibrational Spectroscopy and Thermal Behavior of the First Alkali Metal Hydrated Hexaborate： K2[B6O9（OH）2]

New hydrated potassium hexaborate K2[B6O9（OH）2] has been synthesized under mild solvothermal conditions. The structure was determined by single-crystal X-ray diffraction and further characterized by FT-IR, Rarnan spectra and DTA-TG. It crystallizes in the monoclinic system with space group P21/n, a=0.9036（2） nm, b=0.66052（18） nm, c=1.5997（4） nm, β=91.862（4）°, V=0.9543（4） nm^3 and Z=4. Its crystal structure consists of K-O polyhedra and 1-D stepped polyborate chains constructed by new [B6O9（OH）2]2- fundamental building blocks. 1-D polyborate chains contain 3,8-membered boron rings. Adjacent chains are further linked via H-bonding interactions into 2-D layers. The K^＋ cations reside not only between the layers but also in the 8-membered boron rings of the chains, compensating the negative charges of the borate chains and holding the layers together into the 3-D structure through bonding with oxygen atoms of the chains.     

间甲基苯甲酸稀土配合物的合成及晶体结构

本文合成了间甲基苯甲酸与十五种稀土元素的配合物REL3(RE=Y, Ln～Lu;HL=m～CH3C6H4CO2H), 研究了它们的红外光谱并测定了钕和铽两种稀土配合物的晶体结构, 两者均属单斜晶系, 空间群P2~1/n, 钕离子配位数为9, 铽离子配位数为8, 配合物均具有无限链状聚合结构。     

Clean Synthesis in Water：Darzens Condensation Reaction of Aromatic Aldehydes with Phenacyl Chloride

The Darzens condensation reaction of aromatic aldehydes with phenacyl chloride proceeded very efficiently in a water suspension medium in the presence of triethylbenzylammonium chloride and only trans-2,3-epoxy-1,3-diaryl-1-propanones were formed which can be isolated simply by filtration.The structures of these compounds were confirmed by elemental analysis,IR and ^1H NMR spectra.Therir configurations are in agreement with that of the same compounds reported in the literature.Compared to the classical Darzens condensation,this new method has the advantages of good yields,high stereoselectivity,low running cost inexpensive and environmentally benign procedure.     

基于切比雪夫小波基与年龄相关种群模型的数值解

基于切比雪夫小波基给出与年龄相关种群模型的数值解.利用切比雪夫小波基的性质使得所求偏微分方程转化为矩阵方程,从而简化了数值解的求解过程.最后通过数值例子验证其理论结果.     

11-丁烯在MCM-2222分子筛中的吸附与扩散: Monte Carlo与动力学模拟研究

采用巨正则Monte Carlo方法和分子动力学方法研究了11-丁烯在MCM-2222分子筛中的吸附现象和扩散行为, 得到了11-丁烯吸附在该分子筛孔道中的相互作用能和在不同孔道中的扩散轨迹和扩散系数. 结果表明11-丁烯在MCM-2222分子筛中主要存在两个相互作用能区间, 11-丁烯优先吸附在十元环孔道中; 11-丁烯的扩散和移动主要发生在十二元环超笼的中部, 十元环孔道中的11-丁烯扩散速度明显小于十二元环超笼系统中的扩散速度.     

关于电压教学问题的讨论我们是怎样讲授初中“电压”概念的

关于“电压”这一概念的教学,我们也曾参考汪世清同志“关于在初中怎样讲解‘电压'的问题”一文中的意见作了研究.一致认为这样可以比较正确地给学员树立“电压”的概念;比用液体静压强的对比讲解有着无比的优越性.可是,我们觉得:(1)所用的实验仪器不够直观,不适合课堂示范作业的要求,而且也难作得精确;(2)虽然对概念的树立逻辑性很强,     

独立自主发展石油地震数字处理

<正> 前言在毛主席革命路线指引下,我国石油工业以每年增长百分之二十以上的速度持续向前发展.今年以来,在学习无产阶级专政理论的群众运动推动下,广大石油工人继承和发扬大庆工人阶级“两论”起家的革命传统,刻苦攻读马列和毛主席著作,进一步调动了建设社会主义的积极性,石油工业又取得了令人鼓舞的成就.由于石油勘探工作的迅速发展,新油田不断发现,上半年全国原油产量比去年同期增长了百分之二十四.     

The Crystal and Molecular Structure of Trichosanthin at 2.6 Resolution

The crystallographic refinement of trichosanthin has been performed at 2.6 resolution. The crystal and molecular structure of trichosanthin is described in detail in this paper. On summarizing the regularity of the amino acid sequences of eight kinds of ribosome inactivating proteins and combining with the crystal and molecular structure of trichosanthin, fifteen most conservative amino acid residues are analyzed. It is found that four most conservative polar amino acid residues Gln156, Glu160, Arg163 and Glu189 gather on the molecular surface on the boundary of the large and small domains, thus forming the active center of the protein molecule.     

以四硫富瓦烯为电子媒介体的电流式葡萄糖传感器

用四硫富瓦烯作为酶与电极之间的电子传递体，通过Ｎａｆｉｏｎ水溶液把葡萄糖氧化酶固定在Ｎａｆｉｏｎ－ＴＴＦ修饰玻碳电极上，最后在电极上装饰一层Ｎａｆｉｏｎ膜，制备成葡萄糖传感器。Ｎａｆｉｏｎ膜不仅能防止四硫富瓦烯流失，而且能把抗坏血酸、尿酸等电活性物质阻挡在电极外，防止其干扰，同时具有防污性能。通过实验表明ＴＴＦ＾＋１、ＴＴＴ＾＋２都能够氧化葡萄糖氧化酶中的辅酶。该传感器的线性范围为３．０×１０＾－