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%.     

优化红花桑寄生多糖提取工艺的研究

采用水提醇沉法从红花桑寄生叶中提取多糖.在单因素实验的基础上,分别对影响红花桑寄生多糖水提的4个主要因素——料液比、提取时间、提取温度、提取次数和影响乙醇沉淀多糖的3个主要因素——乙醇体积分数、静置时间、浓缩倍数,设计了L9(34)4因素3水平正交实验,以多糖得率为指标,采用方差分析对结果进行统计分析,结果表明提取次数和乙醇体积分数对得率影响最大.确立了水提红花桑寄生多糖的最佳工艺条件为:提取次数3次,提取温度95℃,料液比为1∶25,提取时间2h;最佳醇沉条件为:浓缩倍数1倍,乙醇体积分数80%,静置时间24h.     

普洱茶中茶多酚和茶多糖的提取工艺研究

以普洱茶为材料、水为提取溶剂,通过正交设计考察了浸提温度、浸提时间、溶剂用量、浸提次数4个因素对其所含茶多酚和茶多糖提取得率的影响,优化茶多酚和茶多糖综合提取工艺.结果表明,最佳提取工艺条件为浸提温度80℃,浸提时间1 h,溶剂用量(固液比)1∶10,浸提次数1次.在优化的提取工艺条件下,提取物干物质得率为20.65%,其中茶多酚含量为30.47%,茶多糖含量为57.26%,且该提取物作用于高脂饮食小鼠降脂效果显著.     

穿山龙多糖分离纯化工艺的研究

以粗多糖得率为指标，比较水醇法、水提ZTC吸附澄清剂法和超声波法三种提取方法，并以穿山龙多糖含量为指标，考察采用水醇法提取穿山龙多糖时，回流时间、固液体积比，提取次数对多糖含量的影响；同时，用硫酸-苯酚法对穿山龙粗多糖中的多糖含量进行了测定．实验结果表明，水醇法提取的多糖得率高于水提ZTC吸附澄清剂法和超声波法，分别提高6．0倍和6．6倍．水醇法的最佳提取工艺条件：回流提取时间90min，液料比1：10，提取次数3次．     

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%。     

桑叶多糖提取及抑菌实验研究

以超声波辅助水提醇沉法提取桑叶多糖,采用正交实验法优化桑叶多糖的提取工艺;采用滤纸片法进行抑菌试验评价桑叶多糖体外抑菌作用。实验考察提取时间、液固比、提取温度等因素对桑叶多糖提取率的影响,观察桑叶醇提物和桑叶多糖对枯草芽孢杆菌、大肠杆菌抑制作用。实验结果证明:超声波提取时间50 min,液固比40:1(m L.g~(-1)),提取温度为70℃,其桑叶浸提液中的多糖得率达到5.50%,体外抑菌实验结果显示桑叶醇提物对枯草芽孢杆菌、大肠杆菌有明显的抑制作用,桑叶多糖对这两种菌则没有抑制作用。     

浒苔多糖的碱法提取工艺研究

对浒苔多糖的碱法提取工艺进行研究,为评价提取条件对浒苔多糖提取率的影响,首先选用固液比、浸提温度、浸提时间和碱溶液浓度4个因素进行单因素多水平实验,在此基础上进行正交试验,筛选出最佳提取工艺条件.实验结果表明,影响浒苔多糖提取率的各因素的主次关系依次为:浸提温度、浸提时间、固液比,碱溶液浓度;浒苔多糖碱法提取的最佳工艺条件为:提取温度90℃,提取时间2.5h,固液比1:40(g:mL),氢氧化钠溶液浓度0.3mol/L;最佳工艺条件下,浒苔多糖的提取率为3.1%.     

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%。     

迎春花多糖提取工艺研究

采用正交试验法研究迎春花多糖的提取工艺,考察了浸提温度、浸提时间、浸提次数、液料比4个因素对迎春花多糖提取率的影响．确立了迎春花多糖最佳提取条件为：液料比40：1,浸提温度为70℃,回流提取3次,提取时间为每次40min．     

葵花籽水溶性多糖的提取工艺研究

试验通过单因素与二次回归正交旋转组合相结合的方法研究了固液比(g/mL)、浸提温度、浸提时间对葵花籽水溶性多糖提取率的影响,确定多糖提取较优的工艺范围。结果表明:各个因素对多糖提取率影响大小的顺序是:固液比提取时间提取温度。频率分析法得到葵花籽多糖最优提取工艺为温度64.2℃,时间34.9 min,固液比1∶17.6,在此工艺条件下葵花籽水溶性多糖提取率为7.1%。     

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…     

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

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.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.