色谱技术在中药指纹图谱研究中的应用

本文介绍了气相色谱、高效液相色谱、超临界流体色谱和高速逆流色谱等几种色谱技术在中药指纹图谱研究中的应用现状，以及使用模糊聚类分析和人工神经网络分析指纹图谱，对中药进行模式识别和质量签定的方法。     

现代分离技术在中草药有效成分分离中的研究进展

介绍了中草药有效成分提取分离的原理和途径,着重讨论了高速逆流色谱、高效液相色谱、现代薄层色谱、双水相等现代分离技术在中草药有效成分研究领域中的进展,并对中草药有效成分分离技术的发展前景进行了展望。     

分子电距矢量对醇类气相色谱保留指数的预测

用MEDV描述子对55个醇的分子结构进行表征,对MEDV矢量和其气相色谱保留指数之间建立了定量结构-色谱保留值关系.借助多元线性回归、逐步回归和交互检验建立了分子电距矢量和55个化合物的气相色谱保留值之间的定量结构-色谱保留值相关模型(QSRR),线性回归十参数模型的复相关系数达到了0.995 0,逐步回归七参数模型复相关系数为0.989 6,交互检验的RCV值为0.970 0,表明模型对样本具有一定的稳定性和预测能力.     

气相色谱法分离苯系物的实验内容改进和教学模式探索

充分利用仪器资源和有限的实验教学课时,对传统教学模式进行了改进。将原来气相色谱实验中使用的较少组分混合样品改为较多组分的混合样品,增大了分离分析的难度,启发学生根据不同的设计方案对不同色谱条件下的实验数据进行比较和讨论,使学生对气相色谱相关理论有了更加深入的理解。     

反相色谱保留值参数与分子结构参数的相关性研究

本文采用实验方法和通过分子结构参数计算方法对色谱保留值参数与分子结构参数进行了相关分析.以此预测不同流动相比例下各化合物的色谱保留值,进而确定最佳色谱分离条件.     

色谱分析在充油电气设备内部潜伏性故障诊断中的应用

本文作者结合自身工作实际,对色谱分析法发现和判断充油电气设备内部潜伏性故障的方法进行了总结,对色谱分析法如何在生产实际中应用进行了阐述。     

枸杞的高效液相色谱指纹图谱

采用高效液相色谱-二极管阵列检测器联用仪(HPLC-DAD)对中药枸杞的甜菜碱、类胡萝卜素提取液进行了指纹图谱研究.研究结果表明:用于枸杞质量控制的液相色谱指纹图谱对提取方法具有很强的依赖性,用枸杞甜菜碱提取液的液相色谱指纹图谱对品种进行识别效果较好,而采用类胡萝卜素提取液的液相色谱指纹图谱有利于枸杞真伪的识别和共有模式的建立;此外,还提供了甜菜碱和类胡萝卜素的紫外光谱,这为定性分析以及不同样本中峰的识别提供了一定的依据.     

采用气相色谱-质谱法分析药对麻黄-羌活的挥发油

采用气相色谱-质谱(GC-MS)法分离测定了药对麻黄-羌活、单味药麻黄和羌活的挥发油,并对其重叠色谱峰采用化学计量学解析法进行了分辨,得到药对和各单味药的纯色谱曲线和质谱。药对麻黄-羌活、单味药麻黄和羌活分辨出的色谱峰,通过质谱库对其进行定性,分别得到58,51和52个定性结果,占总含量的83.75%,88.70%和80.79%。实验结果表明:药对麻黄-羌活中挥发油化学成分有40种来自羌活,13种来自麻黄,新产生了10种化合物。     

非平衡双柱循环色谱研究

从理论和实验丙方面对双柱循环色谱分离过程进行了研究,建立了相应的非平衡模型,以蔗糖和还原糖的双柱循环色谱分离过程进行了实验分析,并采用计算机对该分离过程进行了模拟,实验结果表明,非平衡数学模型计算出的理论流出曲线与实验流出曲线比较吻合,计算机模拟分析结果表明,双柱循环色谱分离产率随着循环次数的增加而增大,采用双柱循环色谱分离获得的分离产率比传统的色谱分离可提高50％以上,当体系中表观选择性系数较小,轴向扩散较严重以及液固两相间的传质阻力较大时,使用双柱循环色谱分离可比使用单柱色谱分离获得更高的分离产率。     

固-液制备色谱分离氢化可的松立体异构体

研究了氢化可的松立体异构体的新型制备色谱分离技术.介绍了氢化可的松立体异构体分离问题的由来, 研究了固液制备色谱中作为固定相的大孔吸附硅胶对氢化可的松立体异构体的静态和动态吸附特性, 以异丙醇为流动相,对氢化可的松立体异构体进行了制备色谱分离,并在实验中采用了色谱循环技术.实验表明, 大孔吸附硅胶对氢化可的松立体异构体的动态饱和吸附量为4.8mg/mL;同时,用异丙醇为流动相的固液制备色谱可以分离氢化可的松立体异构体,在采用循环法后能有效地提高分离度.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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。     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.