钛-5′-硝基-水杨基荧光酮-溴化十六烷基三甲胺显色体系的研究及应用

研究了在阳离子表面活性剂溴化十六烷基三甲胺 (CTMAB)存在下 ,5′-硝基 -水杨基荧光酮 (5′-NSF)分光光度法测定钛的最佳显色反应条件 ,发现在 0 .0 1 2～ 0 .0 2 0 mol/L的盐酸介质中 ,钛与试剂形成 1∶ 4的紫色三元配合物 ,最大吸收峰在 5 99nm,表观摩尔吸光系数 ε=1 .3 6× 1 0 5,钛量在 0～ 8μg/2 5 ml范围内符合 Beer定律 ,配合物在 4h内保持稳定 ,显色反应灵敏 ,选择性较高 ,应用于合金钢中微量钛的直接测定 ,取得了满意结果 .     

4,5-二溴邻硝基苯基荧光酮分光光度法测定微量锌

研究了4,5-二溴邻硝基苯基荧光酮(DB-o-NPF)与锌的反应条件及应用.结果表明,在pH为10.5的硼砂-NaOH缓冲溶液中,阳离子表面活性剂溴代十六烷基吡啶(CPB)存在下,Zn( )与DB-o-NPF生成1∶4蓝色配合物,配合物至少稳定4h,最大吸收在624nm波长处,表观摩尔吸光系数为ε=1.13×105L·mol-1·cm-1,锌浓度在0～0.64μg/mL范围服从比尔定律,方法灵敏,操作简便,用于葡萄糖酸锌片、加锌盐等实物中锌的分析测定,回收率测定值在95%～105%之间.并以原子吸收法相对照,结果较一致.     

9-(3,5-二溴)水杨基荧光酮-溴代十四烷基吡啶分光光度法测定微量钴

详细研究了 9-(3 ,5 -二溴 )水杨基荧光酮 (简称 DBSAF) -溴代十四烷基吡啶 (TPB)与钴形成三元络合物的显色反应条件和光度性质 .结果表明 :在 p H=9.5 0的 Na2 B4O7-Na OH缓冲溶液中 ,钴与试剂形成三元络合物 ,其最大吸收波长在 61 0 nm,表观摩尔吸光系数为 2 .3 0×1 0 5L· mol-1· cm-1,钴 ( )含量 0～ 6μg/2 5 m l范围内符合比耳定律 .用本法测定了维生素B12 中的钴 ,结果较好     

钨(Ⅵ)-二溴羟基苯基荧光酮配合物光谱探针测定蛋白质

研究了W(Ⅵ)- 二溴羟基苯基荧光酮(DBHPF)配合物与蛋白质的相互作用及光谱性质.提出了以W(Ⅵ)-二溴羟基苯基荧光酮配合物作为光谱探针测定微量蛋白质的方法.实验结果表明,在pH为 2.43的 Hac-NaAc缓冲介质中,在表面活性剂溴化十六烷基三甲基胺(CTMAB)存在下,DBHPF - W(Ⅵ)在室温10 min 后与蛋白质形成稳定的复合物,最大吸收波长在573 nm处.蛋白质浓度在0～5 mg·L-1 范围内符合比尔定律,复合物的表观摩尔吸光系数为ε=7.81×105 L·mol-1·cm-1.该方法具有很高的灵敏度和选择性,可直接用于人体尿液、新生牛血清中蛋白质的测定,回收率分别为103%和107%.     

2-(4,5-二苯基-1H-咪唑)-4-噻吩Cu(I)配合物的合成及晶体结构

采用2-(4,5-二苯基-1H-咪唑)-4-噻吩配体,合成了该配体的铜(I)的配合物.采用X-射线单晶衍射仪测定了晶体的结构,结果显示,该配合物属单斜晶系,C2/c空间群,晶胞参数为:a=23·476(5)°A,b=11·393(2)°A,c=23·508(5)°A,β=91·55(°),R1=0·0717,wR2=0·2365.研究了该配合物的吸收光谱、发射光谱和电化学性质.     

N-(5-溴-2-羟基苄基)氨基酸衍生物及其金属配合物的合成、表征及抑菌活性

室温下以N-(5-溴-2-羟基苄基)氨基酸及其希夫碱为配体,水和甲醇为溶剂,采用分步法,将配体与金属离子按1:1的摩尔比在弱碱性条件下络合,合成了24种N-(5-溴-2-羟基苄基)氨基酸类金属配合物,并用核磁、红外光谱对其结构进行了表征.结果表明:在配合物中配体N-(5-溴-2-羟基苄基)氨基酸的羟基、氨基和羧基均参与了配位.抑菌测试表明,N-(5-溴-2-羟基苄基)氨基酸衍生物金属配合物的抑菌活性普遍高于其配体,并且还原型配合物活性要高于希夫碱型,对白色念珠菌的抑菌效果更为明显,均高达100%.     

新显色剂7-[6-溴-(2一苯骈噻唑偶氮)]-8-羟基喹啉-5-磺酸的合成及吸光度法测定微量镍的研究

本文研究了新显色剂7-[6-溴-(2-苯骈噻唑偶氮)]-8-羟基啉喹-5-磺酸的合成及其与镍(Ⅱ)的显色反应条件。在吐温-80的存在下,镍(Ⅱ)与此试剂在 PH=3. 5～4. 6时形成稳定的紫色配合物,ε_(585) =1. 1×10~5l.mol~(-1) .Cm~(-1) ,镍含量在0～10μg/25ml 范围内服从 Beer 定律,Fe~(3 )、Mn~(2 )、Cu~(2 )、Co~(2 ),Zn~(2 )等有干扰。本法可应用于钢铁中微量镍的测定。     

两个含2-(1H-苯并咪唑基)-4-溴苯酚的钴(Π)、锌(Π)配合物的合成、晶体结构及表征

以乙酸钴、2-(1H-苯并咪唑基)-4-溴苯酚为原料通过水热法自组装成新型的配合物[Co(C_(13)H_8BrN_2O)_2]·2(CH_3OH)1;乙酸锌和2-(1H-苯并咪唑基)-4-溴苯酚通过自然挥发法自组装成新型的配合物[Zn(C_(13)H_8BrN_2O)_2]·DMF·3H_2O_2.X射线单晶衍射结果表明配合物1和2都属于三斜晶系,Pī空间群,具有相似的晶胞参数,属于同构体.配合物1通过氢键的作用形成一维链状结构,配合物2通过氢键的作用形成二维层状结构.两者的荧光及热稳定表征结果表明,配合物2比配合物1的荧光强度高.     

试剂5-（溴吡啶偶氮）-5-二乙氨基酚与钌（Ⅲ）的显色反应研究

研究了5-(溴吡啶偶氮)-5-二乙氨基酚与钌(Ⅲ)的显色反应.在pH=6.5的醋酸-醋酸盐缓冲溶液中,形成了配位比为1∶1的深红色二元配合物.λmax=554nm,表观摩尔吸光系数为ε=6.02×104L/mol.     

银-2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚-十二烷基硫酸钠的显色反应

研究了在阴离子表面活性剂存在的条件下,银与2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚的反应条件。阴离子表面活性剂十二烷基硫酸钠能使Ag-2-[3,5-二溴2-吡啶偶氮]-5-二乙氨基苯酚配合物增敏,其最大吸收峰位于565nm处,摩尔吸光系数为6.4×10~4L·mol~(-1)·cm~(-1),在0～0.48μg/ml时符合比尔定律。试剂与Ag~+形成2:1的配合物。此方法用于纯铅及铅锑合金中银的测定,可获得满意的结果。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that