固相微萃取—衍生化法与气相色谱—质谱联用分析葡萄酒中多酚类化合物

建立固相微萃取（SPME）和甲硅烷化结合新的样品预处理方法,应用气相色谱－质谱联用技术对葡萄酒中有机物进行了分析,鉴定了其中19种多酚化合物和极性有机物,并对其中的白藜芦醇进行了定量分析,方法简单,快速,灵敏度高。     

钛硅催化剂的酸碱改性处理

在甲醇－水体系中进行丙烯环氧化反应时，丙烯与双氧水在骨架钛上生成环氧丙烷，TS－1中含有的微量酸中心能够导致环氧丙烷与溶剂反应生成丙二醇，1－甲氧基－2－丙醇和2－甲氧基－1－丙醇，还能促进双氧水的分解，降低双氧水的有效利用率，这种酸中心主要来自于TS－1中硅羟基，配位不饱和的Ti^4 产生的L酸中心与微量铝产生的B酸中心，考察了TS－1催化的丙烯与双氧水环氧化过程中的酸碱效应，以及微量添加物的作用，结果表明：添加微量钠盐（Na2CO3或NaSO4)或NH4OH可以明显提高环氧丙烷选择性，采用氨水作为微量添加物能够明显提高催化剂的稳定性，酸处理无法脱除催化剂中微量铝，反而引入了部分酸中心，结果导致环氧丙烷选择性下降。     

辣根过氧化物酶／聚邻苯二胺膜电极上苯二酚生物催化氧…

用酶的电化学固定化方法制备辣根过氧化物酶／聚邻苯二胺膜（ＨＲＰ／ＰＰＤ）电极－以对苯二酚和邻苯二胺在该酶电极上的氧化为模型体系，讨论了有机物生物催化氧化的一般动力学模式以及影响酶电极检测的因素，邻苯二胺可在辣根过氧化物酶的存在下发生聚合，因而它在ＨＲＰ／ＰＰＤ电极上的氧化过程比对苯二酚的复杂，测定了不同电位对苯二酚在ＨＲＰ／ＰＰＤ电极上的反应动力学参数，并根据实验结果确定该有机物检测的合适工作电位     

微量Ag对Al-Mg-Li-Zr合金时效特性和微观组织的影响

研究了添加微量银对Ａｌ－Ｍｇ－Ｌｉ－Ｚｒ合金的机械性能和时效组织的影响，通过对时效硬度、拉伸强度、延伸率的测试以及Ｘ射线衍射与ＴＥＭ观察表明，微量银的加入可使Ａｌ－Ｍｇ－Ｌｉ－Ｚｒ合金得到显著硬化和强化，同时推迟了时效峰值的显现；银的含量越大，合金的过时效越缓慢；在Ａｌ－Ｍｇ－Ｌｉ合金中加入质量分数为０．５２％的银可生成Ｔ相；同时微量银的加入，抑制了δ＇相的长大．     

石家庄市地表水源微量有机物色谱—质谱联机分析

采用色谱—质谱联机分析技术，对石家庄市地表水源中微量有机物进行探查分析，共检出各类有机物２０５种，对不同水源水中有机物的构成特点进行了探讨     

紫外线在家用饮水净化器中的应用

紫外线在家用饮水净化器中的应用陈若燕杨清廉（中国船舶工业总公司第六三五四研究所九江３３２０００）据多方实验表明，饮用水质的污染物大多可以通过物理－化学方法去除，高分子量的有机物用活性碳吸附法、膜法等也能去除，但要去除低分子量有机物能力最佳的方法应属光...     

室内空气中酞酸酯类物质分析的研究

以固相微萃取（SPME）方法为前处理和分离手段采集室内空气中的酞酸酯类物质,进而在GC／MS上对其进行分析测定。通过对SPME中使用的极性与非极性纤维萃取头的萃取效果进行对比．确立了该类室内空气中酞酸酯类物质的分离和分析方法．并且比较了不同环境中室内各种邻苯二甲酸酯类的相对浓度大小。实验发现．与用传统的有机溶剂吸收空气中的化合物的方法相比．该方法可以检测出低浓度邻苯二甲酸二（2-乙基己基）酯（DEHP）．并且简化了实验过程．减少了干扰及有机溶液的使用量．并可以测定出浓度较低的酞酸酯类物质。     

色质联用研究饮用水氧化后残余有机污染物

采用气相色谱质谱联用方法(Gas Chromatorgraphy／Mass，GC／MS)以及及固相微萃取技术(Solid Phase Micro Extraction，SPME)对饮用水氧化除有机污染物后的残余有机物进行分析，并以此为依据对两种氧化剂效能进行综合比较。     

用三孔环炉法测定饮水中的微量砷

众所周知,砷是对人体有害的痕量元素之一。砷及其化合物被饮用后,可由肠胃道、汗腺、唾液腺、乳腺排出体外。砷在体内能损坏肝脏,致使发生肝硬变。特别能通过胎盘循环而影响胎儿等。因此控制和监测饮水中的微量砷,显得十分重要。砷的测定,通常是用比色法、极谱法、原子吸收来完成。用环炉技术测定饮水中的痕量砷,在文献中还未见到报导。本文用动力催化反应于环炉技术,由砷钼酸铵中释放出的钼对双氧水和碘化钾定量的催化作用,用淀粉为显色剂。并采用微量萃取分离和浓集的方法,以测定饮水中0.02PPm砷。     

废水处理中TiO2光催化剂活性的影响因素

采用光催化技术降解废水中污染物是一种极具前景的废水净化技术,近年来已成为环境治理工作中的一个研究热点,在废水的深度处理与回用、去除难降解有机物、饮用水中微量有机物及空气中挥发性有机物的处理等方面显示出巨大潜力。光催化剂是光催化氧化过程的关键影响因素,一般采用半导体氧化物材料,常用的光催化剂有     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the