贯叶连翘中金丝桃素分离工艺的研究

利用大孔吸附树脂吸附法研究了金丝桃素的提取分离方法，结果表明，贯叶连翘醇提物用D101大孔吸附树脂吸附后，40％乙醇洗脱可以除去大量杂质，80％乙醇可以解吸吸附树脂柱上的金丝桃素，该方法操作简单，消耗低，产品中总金丝桃素含量可达2．13％，提取率为81．3％。     

5A分子筛气相吸附分离正庚烷

研究并开发了一种适合小规模间歇式生产含量不低于９９％的试剂级正庚烷的工艺，对其核心装置吸附分离的操作条件作了必要的考察。实验结果表明，在气相吸附和升温脱附之间增加中间产物的循环，可使产品中正构烷烃含量进一步提高，达到模拟移动床的高效分离。     

黄芪皂甙提取分离方法的研究

利用索氏醇提、回流醇提、萃取纯化、树脂吸附纯化法对黄芪皂甙进行了提取分离．经红外光谱分析表明．树脂吸附法优于饱和正丁醇萃取法．用分光光度法测定了皂甙含量．由结果可知，索氏提取与回流提取无明显差别．从节约成本的角度出发建议用索氏提取进行粗提后，再用树脂吸附法进行纯化．     

痕量硒的吸附伏安法测定

研究了硒一次甲基兰─草酸体系在悬汞电极上的吸附伏安特性．硒络合物在－０．６Ｖ（ＶＳ．ＳＣＥ）产生一灵敏吸附还原峰．峰高与硒浓度在６．２５×１０－９～７．０×１０－７ｍｏｌ／Ｌ范围内成线性关系．用此法，可不经分离，直接测定饮水及镍粉中痕量硒的含量．     

磁性膨润土净水剂制备及其应用

针对粉末状膨润土在水处理应用中存在固液难以分离的问题，进行了磁性膨润土新型吸附剂开发的研究．通过膨润土提纯、在二价和三价铁离子混合溶液中用氨水调节负载铁的氧化物及真空干燥等步骤，制备了一系列不同磁化率的磁性膨润土产品．对产品进行X衍射（XRD）、扫描电镜（SEM）及磁化率表征分析可知，膨润土表面负载的是四氧化三铁，其磁化率的大小随所负载铁含量的增加而增大．对水中微量氯乙酸和铅离子的吸附考察得知，磁性膨润土产品的吸附性能与原粉末状膨润土相当，但是对铅离子的吸附性能要比活性炭高得多．本文制得的磁性膨润土产品可以用磁分离技术非常容易地从溶液中分离出来，而且制备工艺简单，反应条件温和，在实际生产中具有广阔的应用前景．     

大孔吸附树脂对高梁泡鲜果红色素的吸附与洗脱性能

探讨了高粱泡果实红色素的提取条件及大孔吸附树脂对其吸附和洗脱特性．结果表明，高粱泡果实红色素的最适提取剂为酸性EtOH．3种大孔树脂中，X-5型树脂对高粱泡果实红色素的吸附和洗脱性能较好，吸附率达96．17％，解吸率为94．40％，适宜用作高梁泡果实红色素的分离、纯化；适当的色素液浓度、流速、NaCl质量分数及温度均可增大X-5型树脂对色素的吸附率，而用80％～95％EtOH作为洗脱剂，洗脱效果最好．     

表阿霉素在硅胶柱上不可逆吸附行为的研究

亲水作用色谱分离表阿霉素时，在中性及弱酸性条件下，样品在硅胶柱上呈现不可逆吸附平衡过程．对影响不可逆吸附的因素如缓冲液的pH值、离子强度、有机溶剂的类型及流动相中水的含量进行了探讨，推断这种现象是由于溶质离子与固定相表面极少数的强活性硅羟基作用所致．不可逆吸附是在一定条件下产生的，可通过改变洗脱条件减小。     

银杏黄酮苷的不同提取精制方法比较

探讨了溶剂萃取和树脂吸附精制银杏黄酮苷的机理，比较了溶剂萃取法和树脂吸附法提取精制银杏叶中黄酮苷的方法，结果表明，树脂吸附精制银杏黄酮苷优于溶剂萃取精制。溶剂萃取和树脂吸附精制的提取物，其总黄酮苷含量分别为２８．１４％和３５．１１％，产率分别为１．９０％和１．６７％。     

CoMgAlO催化剂对烟道气中SO2和NO的吸附性能

采用共沉淀法和浸溃法制备CoMgAlO催化剂，并于常压下氧化吸附烟道气中的SO2和NO．结果表明，两种方法制备的催化剂对烟道气中的SO2和NO均具有良好的氧化吸附效果，且共沉淀法制备的催化剂优于浸渍法．文中同时探讨了焙烧温度、活性组分添加量和吸附温度等对吸附效果的影响．当焙烧温度为550℃、Co含量为10％（质量分数）、吸附温度为120℃时，由共沉淀法制备的催化剂对SO2和NO的吸附量最大，1g催化剂能同时吸附1．36mmolSO2和0．223mmolNO．     

藏药材红毛五加总皂苷纯化工艺研究

目的：筛选红毛五加总皂苷纯化工艺条件．方法：采用大孔吸附树脂纯化,紫外．可见分光光度法测定红毛五加总皂苷含量．结果：D140型大孔吸附树脂对红毛五加总皂苷的吸附量最大,所以选择D140型大孔吸附树脂分离纯化红毛五加总皂苷．结论：通过大孔吸附树脂富集与纯化,红毛五加总皂苷洗脱率为94．02％．该法可较好地纯化红毛五加总皂苷．     

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