磁场对胆石中胆固醇溶解作用的影响

研究了旋转磁场、静磁场、脉冲磁场对胆石中胆固醇溶解作用的影响。对样品中胆固醇的含量进行了定量分析，测定了溶出百分数。结果表明，上述磁场对胆石中胆固醇的溶解均有不同程序的促进作用。     

胆石溶解药剂蒙克汀的合成研究

蒙克汀（Ｍｏｎｏｏｃｔａｎｏｉｎ，商品名Ｃａｐｍｕｌ－８２１０）又称单辛烧素，是一种国外较为流行的溶解胆石的新药，它是由７０％的单辛烷素（Ｇｌｙｃｅｒｙｌ－ｍｏｎｏｏｃｔａｎｏｉｎ）与３０％的双辛烧素（Ｇｌｙｃｅｒｙｌ－ｄｉｏｃｔａｎｏｉｎ）组成的混合酯类，在国内尚无合成的先例，笔者多次在实验基础上，确定出了合成单、双辛烷素及纯净单辛烷素的方法，后将二种产品按一定比例混合，配制成符合含量及质量要求     

ETBE-ACCA 混合溶剂体外溶石研究

采用乙基叔丁醚（ＥＴＢＥ）、氨羧配位剂（ＡＣＣＡ）及５％氢氧化钠的混合溶剂，对常见类型的胆道结石进行体外溶石研究，各种类型的胆道结石的体外溶石率在９０％～１００％之间，该溶石剂可望成为一种实用的接触性溶剂。     

麦胚油预防高胆固醇血症及抗衰老营养价值研究

本文通过动物实验方法研究了麦胚油的预防高胆固醇血症及抗衰老营养价值。实验结果表明：１）以麦胚油做为饲料的脂肪来源可以满足实验动物的正常生理需要；２）麦胚油较等量的豆油或棕榈油有利于脂肪成分在动物体内的代谢；３）对实验性致高胆固醇血症动物模型，麦胚油对其具有较显著的预防作用；４）麦胚油能够有效延缓机体器官的老化，具有明显的抗衰老作用。实验结果提示，做为一种新型食物资源，麦胚油对于特殊生理状态，具有重要的营养价值及较大的开发价值。     

用钙离子选择电极电位滴定测胆汁中总钙和总镁含量

胆结石是外科常见病,钙和镁在胆石形成中有重要的作用。为探索胆石的成因和溶石的途径,需要测定胆汁中钙和镁的含量。关于胆汁中离子钙的测定,上次我们作了报导。对总钙测定,国内目前常用EDTA络合滴定法,因指示剂变色受胆汁颜色干扰等原因,精确度和准确度均较差。本文介绍用钙离子选择电极作指示电极,在pH 9—10氨性缓冲液中用EGTA作滴定剂测胆汁中总钙和EDTA作滴定剂测胆汁中总钙和总镁的合量,从两者之     

人体胆囊结石超微结构的观察研究

用高真空喷金处理31例不同类型的人体胆囊结石，然后在扫描电子显微镜下观察他们的超微结构，31例人体胆囊结石主要由条状或块状的胆固醇晶体组成。这些胆固醇晶体排列成效放射状、层状、条款状和无规律的交错排列。但固醇晶体之间常见一些不规则的空隙。有的胆石在胆固醇晶体之间夹杂由少量呈类球颗粒组成的絮状团块的胆红素结晶。说明31例胆囊结石均属胆固醇结石。     

高含蜡凝析气井化学清蜡方法研究

油井结蜡影响油田正常生产,化学清防蜡是一种有效的方法。对某油井高含蜡凝析油蜡样全烃气相色谱分析,得到其碳数分布,并分析其结构。在此基础上,选择三种类型清蜡剂进行溶蜡实验。实验发现,清防蜡剂的溶蜡速率都随温度的升高而增大,但增加幅度不同;当温度小于45℃时,分别选择QFL-2和QFL-1来溶解蜡样A和B,而温度大于45℃时,则两者都可以选择QFL-5和QL-2;油基清蜡剂的溶蜡速率最高,乳液型清蜡剂次之,水基清防蜡剂最低;由于蜡样结构不同,相同清防蜡剂对蜡样A的溶蜡速率小于蜡样B的溶蜡速率,说明蜡样A的清防蜡难度更大。     

硫酸钡溶垢效果影响因素实验研究

为了研究溶垢剂DEED 溶垢效果的影响因素,采用失重法对溶垢剂开展了溶垢剂浓度、温度、时间以及pH 值 对溶垢效果影响因素实验研究。首先,采用化学方法对溶垢剂的溶垢机理进行分析,得出溶垢剂DEED 中能够与Ba2+ 发生螯合反应的主要官能团,从而更准确合理地解释各因素对溶垢剂溶垢效果的影响。其次,对影响溶垢剂溶垢效果 的因素进行实验研究。在实验条件下,溶垢剂浓度为9% 时,溶垢率高达82.41%。溶垢时间和温度对溶垢效果影响较 大,随着溶垢时间的增加,溶垢率逐渐增加,在前24 h,溶垢率增加幅度较大,符合油田施工要求。在溶垢时间为24 h 时,当温度从25 ?C升高到85 ?C 的过程中,溶垢率由32.02% 增加到82.88%。pH 值对溶垢剂化学结构中羧基的电离 度及鳌合性能影响很大,从而影响溶垢剂溶垢效果,在溶垢时间为24 h 时,当pH 值从6 增加到12 的过程中,溶垢率 从8.37% 增加到81.26%,在油田施工时,可以考虑注入碱性前置液。     

环己烷溶液中聚丁二烯基双锂引发剂的制备

在环己烷溶液中,由萘锂和丁二烯反应制备了聚丁二烯基双锂引发剂。利用阴离子活性聚合特点和溶度参数相近相溶原则,采取有条件分批加料的方法,解决了萘锂在环己烷溶液中不溶、引发效率低的难题。结果表明,在丁二烯的环己烷溶液由1次加入改为2次加入、溶液摩尔浓度c丁二烯≥0.75c萘锂、丁二烯聚合度达到2之前体系中环己烷溶液加入量V丁油≤1.33V萘锂的条件下,可实现聚丁二烯基双锂引发剂制备反应在均相体系中进行;引发聚合实验证明,所制备引发剂活性没有变化。     

类DLVO理论与胆固醇单水结晶形成过程

就人体胆汁胆固醇单水结晶形成过程提出了类DLVO理论,应用该理论初步阐明了其结晶过程可能的化学物理机制,并分析了该理论在促、抗成核因子及溶石方面的意义.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-