反相高效液相色谱法测定治咳枇杷露中乌索酸的含量

建立了反相高效液相色谱法测定枇杷露中乌索酸的含量,同时采用光电二极管阵列检测器检测乌索酸色谱峰的纯度。色谱柱为Nova-Pak C18(3.9×150 mm,4μm),流动相为甲醇-水(88∶12),流速1.0 mL/m in,检测波长210 nm,柱温25℃。乌索酸在0.039 5~0.237μg范围内线性关系良好(r=0.999 1),检出限为0.2 mg/L(3σ),平均回收率为98.7%。该法适于对含有乌索酸的药物进行质量评价。     

高效液相色谱-质谱法测定亚贡叶中亚贡二萜酸A和C的含量

建立了同时测定亚贡(Smallanthus sonchifolius)叶中亚贡二萜酸A和C含量的方法.采用高效液相色谱-质谱法,多反应监测(MRM)模式,大黄素为内标,色谱柱:UltimateTM XB-C18(150mm×4.6mm,5μm);流动相:V(甲醇)∶V(0.5%醋酸水溶液)=90∶10;流速:1.0mL/min;柱温:25℃.亚贡二萜酸A和C的线性范围均为0.2～10.0μg/mL(r≥0.999),平均加样回收率(n=6)分别为96.6%和92.4%,相对标准偏差(RSD)分别为1.9%和3.2%.实验数据表明,该方法操作简单、准确,且重复性好,可用于亚贡叶的质量控制.     

Quantitative Determination of Smaditerpenic Acids A and C in Leaves of Smallanthus sonchifolius by HPLC-MS

建立了同时测定亚贡(Smallanthus sonchi olius)叶中亚贡二萜酸A和C含量的方法.采用高效液相色谱-质谱法,多反应监测(MRM)模式,大黄素为内标,色谱柱:UltimateTM XB-C18(150 mm×4.6 mm,5μm);流动相:V(甲醇)∶V(0.5％醋酸水溶液)=90∶10;流速:1.0 mL/min;柱温:25℃.亚贡二萜酸A和C的线性范围均为0.2～10.0 μg/mL(r≥0.999),平均加样回收率(n=6)分别为96.6％和92.4％,相对标准偏差(RSD)分别为1.9％和3.2％.实验数据表明,该方法操作简单、准确,且重复性好,可用于亚贡叶的质量控制.     

反相高效液相色谱法测定太太美容口服液中阿魏酸的含量

建立了太太美容口服液中阿魏酸含量的HPLC测定方法.色谱柱为Shim-PackVP-ODS柱(150mm×4·6mm,5μm);流动相为甲醇水冰醋酸(32∶66∶2);流速1mL/min;323nm处进行检测.阿魏酸的线性范围为0·252~5·04μg/mL,r=0·9993,平均回收率为99·9%(n=5),相对标准偏差为1·2%.实验证明该方法简便、快速、准确,适合于太太美容口服液中阿魏酸含量的测定.     

苗药五香血藤的质量测定

目的:建立五香血藤药材的质量测定,为五香血藤的质量标准研究和修订提供借鉴基础。方法:测定药材水分、总灰分和酸不溶性灰分;采用高效液相色谱法测定药材中五味子乙素的含量:色谱柱为Eclipse XDB-C18,流动相为乙腈-水(80∶20,V/V),流速为1.0 m L/min,检测波长为235 nm,柱温为30℃,进样量为20μL。结果:药材水分为10.74~14.49%,总灰分为2.12~4.30%,酸不溶性灰分为0.18~3.16%。五味子乙素检测进样量线性范围为2.10~12.62μg(r=0.9999);精密度、稳定性、重复性试验的RSD≤3%;五香血藤素加样回收率为102.27%(RSD=2.6%)。结论:该研究所建标准可用于五香血藤药材的质量控制。     

HPLC法测定三种蒙成药中盐酸小檗碱的含量

目的:采用高效液相色谱法测定以黄柏为主要成分的三种蒙成药(协日毛道-8、特木仁-5、协日嘎-4)中盐酸小檗碱的含量.方法:色谱柱为Xterra(5μm×150 mm×3.9 mm)柱;流动相为甲醇-0.02 mol/L磷酸-水-乙腈(10∶30∶30∶30,V/V);检测波长为345 nm.结果:回归方程y=3.408×106x-1.04×105,r=0.9997,CV(%)=1.03(n=5).线性范围0.005 mg/g~5.450 mg/g.协日毛道-8,特木仁-5,协日嘎-4中盐酸小檗碱的含量分别为0.93 mg/g、0.65 mg/g、2.96 mg/g,平均回收率为98.88%.结论:本方法简便、可靠,适合蒙药中盐酸小檗碱的含量测定.     

HPLC法测定克糖片剂中的槲皮素

测定克糖片剂中槲皮素的质量比.采用高效液相色谱法,Hypersil C18柱,流动相为甲醇-0.3%磷酸(60∶40,V∶V),流速为1.0 mL/min,柱温为室温,柱长为250 mm,检测波长为360 nm.槲皮素的线性范围为0.2~1.0μg(r=0.999 9),槲皮素的平均加样回收率为99.57%(RSD为0.51%).最终计算得出平均含槲皮素0.052 7 mg/片,RSD为0.48%.本方法可简便快捷的测得克糖片剂中槲皮素的质量比.     

高效液相色谱法检测5α-还原酶活性

建立一种简便快速的5α-还原酶活性检测方法.采用高效液相色谱法(HPLC)测定酶促反应中底物睾酮(T)量的变化,以此反映酶活性的高低.该方法可用于5α-还原酶抑制剂的高通量体外筛选(HTS).方法的色谱条件为色谱柱:BondapakC18(4.6mm(i.d)×300mm,Waters);流动相中甲醇∶水=70∶30(V V);流速为0.5mL·min-1;紫外检测波长为242nm;柱温32℃;T的线性范围在6-300ng·mL-1,相关系数为0 9992;最小检测限为3ng.     

高效液相色谱法测定苯并三嗪-1,4-二氧化物衍生物SR-H22及其有关物质

建立了测定苯并三嗪-1,4-二氧化物衍生物SR-H22的含量及有关物质的高效液相色谱方法。采用Dikma Diamonsil C_(18)(250 mm×4.6 mm,5.0μm)色谱柱;流动相A为乙腈,流动相B为水;流速:1.0 m L·min~(-1);等度洗脱,A-B(25∶75,V/V),检测波长为243 nm;进样体积:10μL。在上述色谱条件下,各杂质及各降解产物均可与SR-H22主峰良好分离,HPLC测定的线性范围为0.1~1.5μg(r=0.999 8),方法中仪器精密度、日内精密度、日间精密度及重复性的RSD均小于2%。采用HPLC测定SR-H22含量及有关物质,方法简便,结果准确可靠。     

高效液相色谱同时测定何首乌中大黄酸、大黄素和大黄酚的含量

采用高效液相色谱法建立了同时测定何首乌中大黄酸、大黄素、大黄酚三种蒽醌类化合物的方法,样品采用超声波法提取,色谱柱为Phenomenex C18(250mm×4.6mm,5μm);流动相为甲醇-0.4%醋酸水溶液(80∶20);流速0.80mL/min;紫外检测波长254nm;柱温为35℃.结果:该方法对大黄酸、大黄素和大黄酚分别在0.0001~12.50μg/mL、0.0002~25.00μg/mL、0.00018~22.50μg/mL范围内线性关系良好,相关系数(r)均大于0.9999,定性检测限(S/N=3)依次是:0.0703ng/mL、0.0282ng/mL、0.0871ng/mL;样品回收率为88.39%~107.2%.结论:本法操作简单快速、定量准确、灵敏度高、成本低,为何首乌中蒽醌类化合物的检测分离及含量测定提供了一个有效的科学方法.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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.     

A computer generator for randomly layered structures

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

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to