大籽獐牙菜的化学成分研究(Ⅰ)

对采自云南新平县的大籽獐牙菜脂溶性部分进行了化学成分研究,采用各种柱色谱法进行分离纯化得到11个化合物,通过波谱数据分析鉴定它们的结构为:1,7-二羟基-3-甲氧基(口山)酮(1),1,2,6 -三甲氧基-8-羟基(口山)酮(2),1,7-二羟基-3,8 -二甲氧基(口山)酮(3)、齐墩果酸(4),马钱苷酸(5),獐牙菜苷(6),7 -甲氧基獐牙菜苷(7),2'-0-(3-羟基苯甲酰基)-獐牙菜苷(8),3 -0-葡萄糖基-1,7,8-三甲氧基(咄)酮(9),2-对羟基苯基乙醇(10),3,7,4',4"-四羟基-3',3"-二甲氧基-2,5-环氧木脂素(11),其中化合物11为首次从该属植物中分离得到.     

獐牙菜的化学成分研究

研究了獐牙菜茎叶的化学成分,采用现代分离分析技术从该植物乙醇提取物的乙酸乙酯萃取部分中分离得到10个化合物,它们是:6-甲氧基色满酮(1)、1,2,3,4-四氢-1,4,6,8-四羟基口山酮(2)、4,5-二氢-6,7-二羟基-3-丁烯基苯酞(3)、4,7′-氧杂-3′,5,-二甲氧基-4′,9,9′-三羟基-7-烯-3,8′-二丙苯(4)、1,2,6,8-四羟基口山酮(5)、1,6-二甲氧基-2,8-二羟基口山酮(6)、1,2,6-三甲氧基-8-羟基口山酮(7)、1,2,8-三甲氧基-6-羟基口山酮(8)、齐墩果酸(9)和豆甾醇(10).其中,化合物6-甲氧基色满酮是首次从该植物中分到,化合物2、3和4为首次从该属植物中分到.     

云南香格里拉高獐牙菜的化学成分研究

对采自云南省香格里拉县海拔4 000 m的龙胆科(Gentianaceae)獐牙菜属植物高獐牙菜(Swertia elata)的化学成分进行研究.方法采用正相硅胶柱色谱,Sephadex LH-20凝胶柱色谱,HPLC,Zorbax PrepHT GF反相柱色谱及MCI等现代分离分析技术进行分离和纯化,并用95%的乙醇对该植物全株进行超声提取,在其正丁醇萃取部分分离出10个已知的化合物.并根据理化性质和波谱数据鉴定化合物结构分别为:1-羟基-3,5,8-三甲氧基酮(1),1-羟基-3,5-二甲氧基酮(2),1,7-二羟基-3,8-二甲氧基酮(3),1-羟基-3,7,8-三甲氧基酮(4),1,5-二羟基-3,8-二甲氧基酮(5),1,8-二羟基-3,7-二甲氧基酮(6),1,3-二羟基-7,8-二甲氧基酮(7),獐牙菜苷(8),(E)-aldosecologanin(9),葡萄糖香草醛苷(10),其中化合物9为首次从獐牙菜属植物中提取分离得到.     

川西獐牙菜的化学成分研究

目的研究川西獐牙菜的化学成分．方法采用硅胶和聚酰胺柱色谱进行分离纯化,根据化合物的理化性质和波谱数据鉴定其化学结构．结果从川四獐牙菜的脂溶性部分分离得到5个化合物,分别鉴定为1-羟基-3,7,8-三甲氧基[口山]酮;1-羟基-2,3,4,5-四甲氧基[口山]酮;1,7,8-三羟基-3-甲氧基[口山]酮;1,8-二羟基-3,7-二甲氧基[口山]酮;1,8-二羟基-3,5-二甲氧基[口山]酮．     

西南獐牙菜的化学成分研究(I)

西南獐芽菜(Swertia cincta Burk)为一种龙胆科獐牙菜属的民间植物药.对采自云南省新平县的西南獐牙菜进行了化学成分研究.采用现代分离分析技术,从该植物80%甲醇提取物的正丁醇萃取部分分离出了7个环烯醚萜类化合物,运用现代波谱技术鉴定它们的结构为:獐芽菜苦苷(1)、龙胆苦苷(2)、獐芽菜苷(3)、6'-O-葡萄糖基-獐牙菜苷(4)、septemfidoside(5)、马钱苷酸(6)、6'-O-葡萄糖基-獐牙菜苦苷(7),其中化合物4～7是首次从该属植物中分离得到.     

紫红獐牙菜极性部位化学成分研究

目的:对紫红獐牙菜化学成分进行研究。方法:采用硅胶,ODS,MCI,Sephadex LH-20等柱层析方法进行分离纯化,根据TLC,UV1,H-NMR1,3C-NMR数据进行分析鉴定。结果:从紫红獐牙菜正丁醇萃取部分分离到6个化合物,经波谱分析鉴定为:1,5,8-三羟基-3-甲氧基酮(I)、1,3,8-三羟基-5-甲氧基酮(II)、1,8-二羟基-35,-二甲氧基酮(III)、1,3,5,8-四羟基酮(IV)、齐墩果酸(V)、獐牙菜苦苷(VI)。结论:化合物II为首次从该植物中分离得到。     

丽江产西南獐牙菜的化学成分研究

西南獐芽菜(Swertia cincta Burk.)为一种龙胆科獐牙菜属的民间植物药.对采自云南省丽江石鼓镇的西南獐牙菜进行化学成分研究.采用现代分离分析技术,从全株该植物95%的乙醇提取物的乙酸乙酯萃取部分,分离出9个已知的酮类化合物,并用现代波谱分析技术鉴定了它们的结构分别为:(1)2,8-二羟基-1,6-二甲氧基酮,(2)1-羟基-3,7,8-三甲氧基酮,(3)1,5-二羟基-3,8-二甲氧基酮,(4)1-羟基-3,5,8-三甲氧基酮,(5)1,3,5,8-四羟基酮,(6)1,2,6,8-四羟基酮,(7)1,3,6,7-四羟基酮,(8)1,3,7-三羟基酮,(9)1,2,3,4-四氢-1,4,6,8-四羟基酮.     

狭叶獐牙菜化学成分研究Ⅱ

目的:研究龙胆科(Gentianaceae)獐牙菜属狭叶獐牙菜(Swertia angustifolia Buch.)的化学成分。方法:采用硅胶柱层析和Sephadex LH-20柱层析分离纯化化合物,依据理化性质和现代波谱技术进行结构鉴定。结果:从乙酸乙酯部分分离鉴定了7个单体化合物,分别为香草酸(vanillic acid,1)、1,3,8-三羟基-5-甲氧基口山酮(1,3,8-trihydroxy-5-methoxy xanthone,2)、5,7,4′-三羟基二氢黄酮(5,7,4′-trihydroxy flavanone,3)、1-羟基-3,5,6-三甲氧基口山酮(1-Hydroxy-3,5,6-trimethoxy xanthone,4)、3,4-二羟基苯甲酸甲酯(methy-3,4-dihydroxy-benzoate,5)、邻苯二甲酸二异丁酯(diisobutyl phthalate,6)、1,8-二羟基-3,5-二甲氧基口山酮(methyl-bellidifolin,7)。结论:化合物1~7均为首次从狭叶獐牙菜中分离得到。     

肺形草的化学成分研究

为研究肺形草的化学成分,采用硅胶柱色谱、葡聚糖凝胶Sephadex LH-20、反相高效液相制备色谱对该植物的乙酸乙酯层进行分离纯化,通过1H NMR和13C NMR波谱技术进行结构鉴定.结果表明:从乙酸乙酯层中分离得到了8个化合物,分别鉴定为2'-acetamido-3'-phenylpropyl 2-benzamido-3-phenyl propionate(1)、1,3,5-三羟基口山酮(2)、3-羟基-4-甲氧基苯甲酸甲酯(3)、咖啡酸乙酯(4)、邻苯二甲酸二丁酯(5)、1,7-二羟基-3,8-二甲氧基口山酮(6)、morroniside(7)、1,3,7-三羟基-4-C-β-D-葡萄糖基呫吨酮(8).其中化合物1～5为首次从该植物中分离得到.     

丽江獐牙菜(Swertia delavayi)化学成分研究

目的：研究民族药丽江獐牙菜（Swenia如如州）的化学成分，寻找活性物质。方法：用系统溶剂提取，常规的硅胶柱层析和薄层色谱进行分离纯化，根据化合物的物理、化学性质和波谱特征鉴定其结构。结果：从丽江獐牙菜的脂溶性部分分离得到6个化合物，其中3个分别鉴定为齐墩果酸、1，8-二羟基－3，7-二甲氧基（口山）酮和1，7，8-三羟基－3－甲氧基讪酮，另3个结构正在鉴定中。结论：所有化合物均为首次从该植物中得到。     

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