响应面法优化藏药毛莲蒿总香豆素的超声辅助提取工艺

通过单因素实验法考察乙醇体积分数、浸提时间、浸提温度、料液比及超声时间对毛莲蒿总香豆素得率的影响,并通过Box-Behnken试验设计优化毛莲蒿总香豆素的超声辅助提取工艺.结果表明,毛莲蒿总香豆素的最佳提取工艺为乙醇体积分数72%,浸提时间71min,浸提温度68℃,料液比1∶58(g/mL)及超声时间30min,在该条件下毛莲蒿总香豆素的平均得率为3.45%.优化后的提取工艺方便、可行,可为毛莲蒿中总香豆素类化合物的提取提供参考.     

方格星虫多糖碱法提取工艺研究

【目的】研究碱法提取方格星虫体壁中水溶性方格星虫多糖的条件及优化。【方法】根据料液比、浸提时间、浸提温度、碱液浓度对多糖得率的影响,并通过正交试验得到方格星虫水溶性多糖浸提工艺优选因素组合。【结果】影响方格星虫多糖得率的因素主次顺序为浸提温度料液比浸提时间碱液浓度;最佳浸提条件为温度50℃,料液比1∶6g/mL,时间4h,碱液(NaOH)的质量分数为8%。【结论】最佳浸提工艺条件下多糖浸提提取率最大为1.81%。     

翅果油树多糖提取工艺的优化

本试验采用水提醇沉法提取翅果油树叶片中的多糖,探讨了浸提温度、浸提时间、固液比和浸提次数对多糖得率的影响.在单因素试验的基础上,通过正交试验确定最佳提取工艺条件.结果表明:在试验范围内,最佳提取温度为75 ℃,在此温度下提取次数对多糖提取率影响最大.翅果油树多糖提取的最优条件为提取温度75℃,固液比1∶ 10,浸提2次,每次浸提1.5 h,其水溶性多糖提取率达10.07%.     

食用菌多糖的提取工艺研究

本文以平菇子实体为对象,探讨了食用菌子实体多糖的提取工艺,考察了料水比、浸提时间、浸提温度、醇析浓度等因素对提取结果的影响.实验结果表明,水法提取的最佳工艺条件为1∶40料水比,100℃,提取3.0h,80%乙醇醇析;碱法提取的最佳工艺为0.7 mol/L氢氧化钠,1∶60料液比,100 ℃,提取5h,80%乙醇醇析.     

白骨壤植物多糖的提取工艺优化

报导了白骨壤水溶性多糖的水提醇沉工艺。以多糖提取率为评价指标,采用单因素试验和L(9 34)正交设计正交试验设计,研究了浸提时间、浸提温度、浸提次数和料水比对白骨壤水溶性多糖提取的影响。结果表明,影响多糖得率的主次因素为浸提次数、浸提温度、浸提时间及料水比,白骨壤水溶性多糖最佳提取工艺条件为:浸提时间2 h,浸提温度100℃,浸提次数2次,料水比1:40。在此最佳工艺条件下,多糖的提取率为3.89%。     

正交法优化大黄中大黄酸的提取工艺的研究

采用正交实验法, 从提取时间、温度、液料比3个因素出发对从大黄中提取大黄酸的工艺进行了研究. 以大黄酸得率和含量为指标, 得出大黄酸的最佳提取条件为: 浸提时间为3h, 浸提温度为70℃, 丙三醇: 氯仿浓度为1:3, 液料比为5: 1.     

基于超声波辅助法的杜仲籽蛋白提取工艺优化

采用单因素和正交试验方法对超声波辅助提取杜仲籽蛋白工艺进行了优化.先选取料液比、超声时间、超声温度、浸提pH值等条件对杜仲籽蛋白的提取工艺进行单因素实验,采用L9(34)正交试验确定本工艺最佳条件.实验结果表明,在超声波辅助提取杜仲籽蛋白最佳工艺条件（料液比为1∶25,超声时间为30 min,超声温度为50 ℃,浸提pH值为10.0）下,杜仲籽蛋白提取率为77.03%.     

枸杞总黄酮提取工艺优化及不同年份枸杞总黄酮含量测定

为探究枸杞贮藏过程中总黄酮含量变化规律,以枸杞总黄酮提取率为指标,采用单因素实验研究浸提温度、乙醇体积分数、料液比和提取时间4因素对枸杞总黄酮提取率的影响,设计正交试验优化提取工艺,并在优化条件下研究不同年份枸杞总黄酮含量及理化指标间的差异.结果发现,最佳提取工艺参数即浸提温度70℃、乙醇体积分数80%、料液比1∶15 g/mL、提取时间2.5 h、提取次数为2次.在此条件下,发现枸杞总黄酮含量随贮藏时间延长而呈现下降的变化趋势,这为枸杞总黄酮的开发利用和快速鉴别枸杞新陈提供理论依据.     

正交优化橘皮黄酮的提取工艺研究

以橘皮为原料,探讨橘皮黄酮提取的最佳工艺条件。考察乙醇浓度、料液比、提取时间和提取温度等因素对橘皮黄酮得率的影响,在单因素试验的基础上,进行L9(34)正交试验。结果表明,最佳提取工艺条件为:乙醇浓度为65%,料液比为1:15,提取时间为40 min,提取温度为65℃,在此条件下,橘皮黄酮得率为8.94%。     

正交法优化茶籽饼粕中茶皂素的提取工艺

采用正交实验法,从提取时间、温度、乙醇浓度、液料比4个因素出发对从茶籽饼粕中提取茶皂素的工艺进行了研究．以茶皂素得率和含量为指标,得出茶皂素的最佳提取条件为：浸提时间为5h,浸提温度为70℃,乙醇浓度为80％．料液比为9：1．     

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