气相色谱指纹法鉴别白酒真伪的研究

通过气相色谱法建立白酒的指纹色谱图,利用指纹色谱图鉴别白酒的真伪。用ZB-624毛细管柱分离样品中的微量组分,用FID检测器进行测试,直接取1μl白酒进样分析。白酒样品1含量在0.001%以上的微量组分总计40个,占总有机成分含量5.55%。该法能分析白酒中有机微量成分及其量比关系规律特征,可为鉴别白酒真伪提供参考依据。     

白酒中微量芳香成分的气相色谱-质谱检测

分别采用DB-WAX、HP-5MS石英毛细管柱,选用直接进样方式,利用气相色谱-质谱联用仪对重庆某白酒厂4种白酒中的微量成分进行定性分析,通过图谱库检索,鉴定出4种白酒中微量芳香物质的成分,并研究了其在不同白酒中的差异.本方法为白酒的勾兑和质量控制提供了一种高效、准确的分析方法.     

指纹图谱技术结合指标成分测定法监控颗粒剂制备

通过指纹图谱技术结合指标成分定量分析,建立肾康颗粒制备过程质量控制的监测方法。根据制备工艺,对肾康颗粒药材、中间体(水煎液、醇沉液、水沉液)及颗粒的指纹图谱进行多波长融合、相似度评价,并对指标成分群进行定量分析。大黄和丹参药材、中间体和颗粒的融合指纹图谱匹配得到21个共有峰,红花和黄芪药材、中间体和颗粒的融合指纹图谱匹配得到27个共有峰,多指标成分在各级样品中均可检测到;中间体和颗粒的融合指纹图谱相似度大于0.89,表明物质组成在制备工艺过程中保留良好;指标成分群含量测定结果可表征物质组成在工艺过程中定量转移的情况。采用指纹图谱技术与多指标成分定量相结合的综合评价方法可以有效控制从药材到制剂的生产过程,为肾康颗粒生产的质量控制提供保障。     

“指纹图谱应用示范研究”通过国家验收

2004年3月19日,“十五”国家科学技术攻关项目———“指纹图谱应用示范研究”在杭州正式通过国家科学技术部和国家中医药管理局的验收。这项由浙江大学药学院、中国药品生物制品检定所和天津天士力集团有限公司等单位联合承担的课题,在课题负责人林瑞超教授、程翼宇教授的带领和课题组全体同仁的努力下,利用现代分析技术和手段,系统地建立了中药指纹图谱分析方法,创建了多元指纹图谱等技术,有效地解决了中药多组分中主要成分的质量控制。这种先进实用的中药质量指纹图谱分析技术得到了与会权威专家的高度评价,并顺利通过国家验收。“指纹图…     

影响白酒气相色谱分析效率的因素及改进措施

气相色谱具有高效能、高选择性、高灵敏度,且易实现自动化,是现代质量管理中一个重要的工具.白酒的风格由所含的微量香味成份所决定,其质量控制的关键是应用气相色谱仪准确测定这些香味组份的含量,气相色谱在白酒的内在质量监控上起着"眼睛"的作后.在激烈的市场竞争中要不断地提高白酒的质量,气相色谱仪在检测中的性能也与之相适应.现就当前影响气相色谱分析性能的一些因素及改进措施作如下探讨.     

色谱指纹图谱在精油质量分析中的应用研究进展

精油是天然活性成分,是由一类化学成分组成的复杂体,通过多组分、多指标的分析检测,对其整体信息予以控制,才能科学有效地评价其质量、品质。指纹图谱技术作为复杂化学体系分析的重要方法,可综合反映出精油组分的色谱特征信息,达到全面质量控制的目的。本文综述了指纹图谱技术及其在精油质量分析中的现状与应用,旨在建立规范的精油色谱指纹图谱并推广应用,这对精油的质量控制和标准完善,以及我国精油植物资源的开发具有十分重要的意义。     

影响白酒气相色谱分析效率的因素及改进措施

气相色谱具有高效能、高选择性,高灵敏度,易实现自动化,是现代科学质量管理中一个重要的工具。白酒的风格由其所含的微量成分所决定,其质量控制的关键是应用气相色谱仪准确测定这些组份的含量。气相色谱在白酒的内在质量监控上起着”眼睛”的作用。现就当前影响气相色谱分析性能的一些因素及改进措施作如下探讨。     

几种豆科中草药的电化学指纹图谱鉴别

目的:应用电化学振荡技术测定几种豆科中草药电化学指纹图谱,研究同科不同属的中草药指纹图谱的群集特征.方法:在锰离子催化的振荡反应体系中,以中草药为反应耗散底物,应用电化学工作站测定不同中药的电化学指纹图谱.结果:几种豆科中草药电化学指纹图谱各具特色.结论:利用电化学指纹图谱技术鉴别豆科几种中草药是可行的.     

鱼腥草超微粉黄酮类成分HPLC指纹图谱的研究

利用高效液相色谱法建立了鱼腥草超微粉黄酮类成分的色谱指纹图谱。色谱条件:色谱柱为SHIM-PACKVP-C18柱(250mm×4.6mm,10!m),乙腈-1%甲酸梯度洗脱,流速为1.0ml/min,检测波长254nm。建立了鱼腥草超微粉HPLC指纹图谱,标定了7个共有峰。结论为利用HPLC指纹图谱可以较全面地控制鱼腥草超微粉的内在质量。     

咸味香精的气相指纹图谱及质量评价研究

采用固相微萃取法提取香精的挥发性成分,应用气相色谱技术进行分析,研究了咸味香精挥发性组分的气相指纹图谱的分析方法,并同时分析了气相指纹图谱用于咸味香精质量控制的可行性.结果表明:咸味香精挥发性组分指纹图谱稳定性好,相似度高,具有较强的特征性和唯一性.该图谱能综合、准确地反映咸味香精的风味情况,是一种有效的咸味香精质量控制模式.     

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