响应面分析法优化甘草多糖提取条件

利用响应面分析法对甘草粗多糖提取工艺条件进行优化,在单因素试验基础上选取液料比、时间和温度3个因素,以甘草粗多糖提取率为响应值,对提取工艺条件进行优化,得到甘草粗多糖提取的最佳工艺条件为:液料比31∶1,时间2.1 h,温度63℃,在此条件下提取率可达10.23%。     

马桑相关产业开发中马桑蚕沙制备叶绿素酮钠盐粗品工艺研究

研究了马桑相关产业开发中,以马桑蚕沙为原料提取叶绿素制备叶绿素铜钠盐粗品的工艺条件。通过实验结果表明,采用95%乙醇为提取溶剂,取50 g样品加入300 mL提取溶剂,在75℃水浴中搅拌回流提取3 h,皂化使用5%NaOH-乙醇溶液25 mL,皂化温度60℃,皂化时间90 min,铜代前加水量与皂化液体积比为1∶7,铜代使用10%CuSO_4溶液2 mL,铜代pH值为2,加5%NaOH-乙醇溶液制盐,60℃干燥的条件较为适宜。采用该工艺,叶绿素铜钠盐粗品的平均纯度可达24.3%,平均收率可达到2.10%。     

甘草中甘草酸粗品最佳提取条件研究

研究萃取剂用量、温度、时间、ｐＨ值、酸化剂与甘草中甘草酸粗品提取率之间的关系。得出从甘草中提取甘草酸粗品的最佳提取条件为：蒸馏水为萃取剂,样品／萃取剂为１∶８,在９０℃提取,萃取时间２ｈ／次（共３次）,Ｈ２ＳＯ４（３．５ｍｏｌ·Ｌ－１）作酸化剂,在此最佳提取条件下得到甘草酸粗品中甘草酸含量为６５％以上。     

甘草中甘草酸的提取研究

对甘草中甘草酸的提取进行了研究,考究了助剂对提取率的影响。结果表明,提取的最佳条件为：助剂与甘草的重量之比为０．２５：１,助剂（１）优于助剂（２）,在该实验条件下,粗品的提取率可达９７％左右。     

中药甘草水溶性多糖的提取与测定

对中药甘草水溶性多糖的提取工艺进行了研究，并探讨了脱蛋白的优选方案．正交试验表明，水煎煮法提取水溶性甘草多糖的最佳工艺条件为：料液比为1：8，温度控制在90℃，提取时间为3h；超声法提取水溶性甘草多糖的最佳工艺条件为：料液比为1：8，超声功率为100W，提取时间15min．脱蛋白的最优方法为：三氯乙酸-Sevag法．结果表明，在最佳提取工艺条件下，超声法提取水溶性甘草多糖的量是水煎煮法的2．77倍，说明超声法是从甘草中提取水溶性多糖的一种较好的方法．     

酶法结合膜技术制备高效价肝素钠的工艺研究

以肝素钠的效价为指标,以猪小肠黏膜为原料,从中提取抗凝血药物肝素钠,提出酶法结合膜技术提取肝素钠;并将纯化工程中的传统静态树脂吸附改为动态吸附,与传统工艺相比。在此工艺条件下,酶解后产品的效价提高了33%,最后收率可提高了34.7%。加入膜技术除去杂蛋白和核酸后,以效价衡量产品纯度,对比粗品提高了125%,对比精品提高了20%。     

苝系颜料的制备方法研究

本文以3，4,9，10-苝四甲酸二酐和一甲胺为原料，以脂肪醇催化制备苝系颜料的方法．系统研究了反应时间、温度、介质、物料比、催化剂等因素对颜料收率、色光、色力的影响，确定了最佳的工艺条件，使C．I．颜料红179粗品的收率达到了98．56％．     

盐酸小檗胺的提取及精制

以三颗针提取小檗碱粗品的母液残渣为原料,对提取制备盐酸小檗胺的精品工艺进行了研究.实验证明以苯为提取溶剂,控制减压浓缩温度40～60℃,粗品小檗胺烘干温度39～48℃,pH约2.5时,按粗品量的3%加入活性炭脱色,重结晶处理2次,风干的盐酸小檗胺精品含量＞95%.     

甘草中甘草酸提取方法的比较

为了研究甘草中甘草酸的提取方法及影响提取产率的因素,以新疆乌拉尔甘草的粗粉为原料,采用不同的提取溶剂,用微波法和超声波法从甘草中提取甘草酸,并对二者进行比较,结果表明,用超声波法提取,以质量分数为0.5%的氨性醇为提取溶剂,所得的甘草酸粗品产率最高,达到35.4%.超声波法比微波法用时长,但操作简单、无需高温、耗能少,更适合实验室中使用.     

化学氧化法精制11-氰基十一酸

以11-氰基十一酸(11-CUA)的纯度和收率为目标函数,采用三种不同的氧化剂精制粗品11-氰基十一酸,通过对比实验及对氧化产物的红外光谱解析与熔点测定,确定了双氧水是合适的氧化剂.再利用正交试验对双氧水精制11-氰基十一酸的工艺条件进行研究,得到优化实验条件:在双氧水质量分数为15%、温度为20℃、pH值为2.0、反应时间30 min的条件下精制粗品11-CUA,产品纯度达99.86%,收率93.62%.     

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.