新疆产黄花蒿挥发油成分研究

采用水蒸汽蒸馏法提取，运用毛细管气相色谱．质谱联用法对新疆产黄花蒿(Artemisia annua L.)挥发性化学成分进行了分析，用气相色谱面积归一化法测定了各成分的相对百分含量，经毛细管色谱分离出48个峰，并鉴定出峰所对应的化合物，其主要化学成分为2，5-二氢-3-甲基呋喃(68．48％)；β—月桂烯(10．13％)；1R，3Z，9S-4，11，11-三甲基-8-亚甲基二环[7，2，0]-3-十一碳烯(7．74％)；7，11-二甲基-3-亚甲基-1，6，10-十二碳三烯(2．42％)；桉油醇(1．68％)；圣亚麻三烯(1．52％)等，为进一步开发利用提供了科学依据。     

百里香挥发性成分的研究

采用水蒸气蒸馏法提取，同时采用毛细管气相色谱．质谱联用法对百里香的挥发性化学成分进行了分析研究，经毛细管色谱分离出81多个峰，并且确认了所含的68种化合物．用气相色谱面积归一法测定了各成分的相对百分含量，其主要化学成分为：百里酚(36．08％)、1．甲基-3-(1．甲基乙基)苯(12．11％)、7，11-二甲基．1，6，10-十二三烯(6．88％)、2-甲基-5-(1-甲基乙基)-苯酚(4．86％)、桉油醇(4．21％)、1．甲氧基-4-甲基-2-(1-甲基)苯(3．78％)等，为进一步开发利用提供了科学依据．     

灰绿黄堇挥发性成分的分析研究

采用水蒸气蒸馏法提取，同时采用毛细管气相色谱质谱联用法对灰绿黄堇挥发性化学成分进行了分析研究．经毛细管色谱分离出13个峰，并且确认了所含的全部化合物．用气相色谱面积归一化法测定了各成分的相对百分含量．其主要化学成分为：3．7—二甲基—1．6—辛二烯—3—醇(46．80％)；2—氨基苯甲酸—3．7—二甲基—1，6—辛二烯—3—酯(11．90％)；4—甲基—1—(1—甲基乙基)—3—环己烯—1—醇(10．66％)；α—松油醇(8．31％)等，上述4种化合物的含量占全油的77．67％．为进—步开发利用提供了科学依据。     

顶空-固相微萃取-气相色谱-质谱联用分析黄山野菊花的挥发性成分

采用顶空-固相微萃取提取黄山野菊花中的挥发性成分,并用气相色谱-质谱联用技术分析其化学成分.结果表明:从黄山野菊花中共鉴定出55种挥发性成分,占挥发性成分总量的79.03％,主要成分为萜类及其含氧衍生物.黄山野菊花中含量较高的挥发性成分有樟脑(23.49％)、桉叶油醇(14.04％)、氧化石竹烯(5.80％)、2-莰醇(4.49％)、莰烯(3.21％)、乙酸冰片酯(2.96％)和1-石竹烯(2.72％).     

浙江产石胡荽的挥发性成分研究

采用气相色谱-质谱联用技术(GC-MS)分析浙江产石胡荽的挥发性成分,鉴定出41种成分,并测定了其相对含量.结果表明:其主要成分为反武-乙酸菊花烯酯(42.18%)、4,4-三甲基-二环[3.2.0]-6-庚烯-2-醇(6.85%)、石竹烯氧化物(4.42%)、2-(2-甲基呋喃基)-5-甲基-呋喃(3.76%)、棕榈...     

兰香草精油化学成分的研究

采用常压水蒸气蒸馏法提取了兰香草挥发油，得油率为0．35％～0．52％．其相对密度为(20℃)0．9980～0．9900，折射率为(20℃)1．4608，比旋光度为 0．51^*，酸值为1．5，并用毛细管气相色谱、红外光谱、核磁共振谱和色-质联机等对该挥发油进行了系统的成分分析．在分出的112个色谱峰中，共鉴定出71个化合物，占挥发油总量的94．6％．其主要成分为芳樟醇、紫苏醇、香芹酮、荠芋烯、4-甲基-6-庚烯-3-酮、菉草烯、马鞭草烯酮、左旋松香芹酮、2-壬烯-4-炔等。     

南天竹叶挥发性成分研究

采用顶空固相微萃取和气质联用技术(HS-SPME-GC-MS),分析了南天竹叶挥发性成分.从南天竹叶子中鉴定出17个化合物,占挥发油成分总峰面积的85.84%.在南天竹叶子鉴定的挥发性成分中,顺3,3,5-三甲基乙酸环己酯(14.21%)含量最高,其次为6-甲基-5-庚稀-2-酮(13.66%)、2-己醛(6.53%)、己醛(5.94%)和(E)-6,10-二甲基-5,9-十一碳二烯-2-酮(5.94%).     

高原鼢鼠肌肉脂肪酸分析

采用气相色谱和质谱联用分析高原鼢鼠肌肉脂溶性物质，共确定31种脂肪酸。其主要成分有异十六碳酸(23．4％)，十六碳酸(21．69％)，十八碳二烯(9，12)酸(14．97％)，十八碳烯(9)酸(12．58％)，十八碳烯(11)酸(8．7％)，十八碳酸(8．83％)等。另外，高原鼢鼠肌肉脂溶性物质含有一些特殊脂肪酸成分，其特殊性在于奇数碳原子脂肪酸和异构脂肪酸种类较多，反式油酸比例很高(21．28％)，并含有十八碳二烯(8，11)酸(0．18％)和十八碳二烯(9，11)酸(0．07％)等。     

微波-同时蒸馏萃取花椒挥发油化学成分的GC-MS分析

采用微波-同时蒸馏萃取刺异叶花椒，GC—MS鉴定其挥发性组分，共分离出95种成分，鉴定57种化学成分，其峰面积相对百分含量占挥发油总量的百分数为91．39％，主要为挥发性萜烯化合物及其衍生物等。除含有δ-3-蒈烯(18.54％)、柠檬烯(11．99％)、α-侧柏烯(5．98％)等外，抗癌活性组分β-榄香烯也较高，达2．65％，具有深入开发利用前景。     

3种牡丹花器官不同部位挥发性成分分析

【目的】对3种野生牡丹花器官的挥发性成分进行研究与分析,明确关键挥发性成分及释香部位,为指导牡丹花香育种、探索花香遗传规律等后续研究和开发相关产品提供参考。【方法】采用顶空-气相色谱质谱联用(HS-GC-MS)技术对大花黄牡丹(Paeonia ludlowii)、黄牡丹(P.lutea)、杨山牡丹(P.ostii)花器官不同部位(整花、花瓣、雄蕊)的挥发性成分进行测定,并对3种牡丹检测出的挥发性成分进行主成分分析(PCA)和偏最小二乘法判别分析(PLS-DA)。【结果】在3种牡丹花器官中共检测出147种挥发性物质。大花黄牡丹花器官中的化合物主要为酮类、醇类、烯烃类和醛类,整花中的挥发性成分以苯乙酮、6,6-二甲基双环[3.1.1]庚烷-2-甲醛和芳樟醇为主;花瓣中的挥发性成分以β-古巴烯、苯乙酮和芳樟醇为主;雄蕊中的挥发性成分以苯乙酮和芳樟醇为主。黄牡丹花器官中的化合物主要为烯烃、烷烃和醇类,整花和花瓣部位的挥发性物质主要是α-蒎烯、β-古巴烯、芳樟醇;雄蕊部位以辛烷、β-古巴烯和α-蒎烯为主。杨山牡丹花器官中的挥发性物质以烯烃和烷烃类为主,整花部位中的挥发性成分主要为α-蒎烯、罗勒烯...     

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