花生苗膳食纤维提取工艺研究

以花生苗为原料,通过正交实验法,确定花生苗中水溶性膳食纤维的最佳提取工艺条件为：pH=6、温度60℃、提取液用量15mL／g、时间20min．此条件下水溶性膳食纤维提取率为4．97％．同时用化学法、酶法、酶法-9化学法结合法分别提取花生苗水不溶性膳食纤维,通过对3种方法得到的水不溶性膳食纤维进行分析比较,酶法-9化学法结合法得到的水不溶性膳食纤维的持水力和膨胀力分别2．624g·g^-1和1．425mL·g^-1.     

蔗渣中不溶性膳食纤维提取工艺

以蔗渣为原料提取不溶性膳食纤维,探讨了料液比、pH值、提取时间、提取温度对提取率的影响。在单因素试验的基础上,通过L9(34)正交试验确定了影响膳食纤维提取率的最主要因素是料液比,得出蔗渣不溶性膳食纤维的最佳提取工艺参数为:料液比1∶20,pH值5.5,40℃提取45min,在此条件下提取率达53.75%。所制备的不溶性膳食纤维为淡黄色,膨胀力为4.5 mL/g、持水力为813.6%。     

可溶性番茄膳食纤维的提取工艺

优化番茄番茄中可溶性膳食纤维(SDC)的提取工艺,采用水提醇沉的方法,以正交实验优化番茄中SDC的提取工艺。得到最佳工艺条件为:提取溶剂水用量40mL/g,乙醇与提取液体积比为4∶1,提取时间30min,浸取温度60℃时产率最高。在此条件下提取产率达到20.3%。结果表明,番茄膳食纤维按照此工艺提取的SDC含量较高。     

酸法提取红雪茶渣水不溶性膳食纤维的工艺优化

利用红雪茶渣作为提取工艺的原料,运用简便的酸液提取法制备红雪茶渣水不溶性膳食纤维,为红雪茶渣水不溶性膳食纤维副产物的综合开发利用开辟新途径,为生产水不溶性膳食纤维提供新料源思路.在酸液浓度、料液比、处理温度、处理时间4个单因素试验的基础上设计四因素三水平的正交试验,研究红雪茶渣水不溶性膳食纤维的最佳工艺条件.结果表明,影响红雪茶渣水不溶性膳食纤维产率的因素由大到小次序为:料液比处理温度酸液浓度处理时间.通过正交试验结果获得的最佳工艺条件为:酸液浓度0.10 mol/L,酸处理时间3.0 h,酸处理料液比1∶50 g/m L,酸处理温度50℃.该提取条件下,红雪茶渣水不溶性膳食纤维的得率为(34.61±0.19)%.     

综合加权评分法优化麦糟不溶性膳食纤维分离工艺

优化化学法制备麦糟不溶性膳食纤维的碱溶工艺条件.通过单因素和正交试验,考察NaOH浓度、碱溶温度和碱溶时间对不溶性膳食纤维得率和不溶性膳食纤维中杂质含量的影响,分析因素的主次顺序和显著性,优化工艺条件.结果表明,在NaOH浓度0.375 moL/L,碱溶温度60℃,碱溶时间70 min条件下,制备得到麦糟不溶性膳食纤维的质量较高,验证试验不溶性膳食纤维得率为35.36%,不溶性膳食纤维中蛋白质质量分数为4.96%,综合评分为75.48,与正交试验结果75.57相差0.12%,结果可行.     

超微粉碎辅助提取玉米皮水溶性膳食纤维的研究

以玉米皮为原料,利用超微粉碎与酶解技术提取玉米皮水溶性膳食纤维,并通过单因素实验和正交试验确最佳制备工艺条件。结果表明,玉米皮超微粉粒径为38～45μm,酶解温度55℃,酶解时间为2.5 h,酶添加量为0.8%,料液比为1∶23(g/mL)时,玉米皮水溶性膳食纤维得率最高,为13.69%。     

柑橘囊衣膳食纤维的改性研究

采用双螺杆挤压活化技术,研究了柑橘囊衣膳食纤维挤压改性工艺条件。通过单因素和正交试验,最终确定了最佳挤压加工工艺条件为:挤压温度170℃、物料含水量10%、挤压压力4.5MPa。在最佳挤压工艺条件下,经挤压改性后膳食纤维持水力由1.18g/g增加到了1.99g/g;膨胀力从1.99mL/g增加到4.88mL/g。     

方竹笋残渣不溶性膳食纤维制备工艺研究

为开发利用方竹笋残渣,采用酸碱法制备膳食纤维;以不溶性膳食纤维得率为指标,分别考察各因素对制备工艺的影响。结果表明,在碱液pH为12.5、温度60℃、料液比1∶10、浸泡时间2 h和酸液pH为2、浸泡温度60℃、料液比1∶8,浸泡时间1.5 h的条件下,方竹笋残渣不溶性膳食纤维得率为52%,持水力为5.19 g/g,膨胀力为5.72 mL/g,持油力为7.16 g/g。     

三七茎叶中γ-氨基丁酸提取工艺研究

探索三七茎叶中γ-氨基丁酸提取工艺.考察提取的溶剂、时间、次数、温度及物料比5个单因素影响,采用正交实验分析方法确定最佳工艺条件.其结果表明三七茎叶中γ-氨基丁酸的最佳提取工艺为:提取溶剂为水,提取时间3 h,提取次数3次,提取温度60 ℃,提取物料比1 g∶10 mL,在此条件下γ-氨基丁酸的提取率为0.46%.     

花椰菜茎叶渣提取水不溶性膳食纤维及其脱色工艺的研究

本研究以提取叶蛋白后的花椰菜茎叶渣为原料,采取化学法提取水不溶性膳食纤维(IDF),研究不同p H、碱浸温度、碱浸时间、酸浸温度、酸浸时间对花椰菜茎叶IDF提取率的影响,并利用H2O2对提取出的IDF进行了脱色研究,探讨不同H2O2质量分数、料液比、反应温度、反应时间对脱色效果的影响,以及不同细度的花椰菜茎叶IDF的性质变化。结果表明,最佳提取工艺为碱浸p H10、碱浸温度50℃、碱浸时间50min、酸浸温度40℃、酸浸时间60min,该工艺条件下IDF提取率达91.31%;最佳脱色工艺为:H2O2体积分数7%,料液比(g/m L)1/80、脱色温度40℃、脱色时间为4 h,在此条件下漂白得到的IDF的白度达81.79;IDF粉碎过80目筛后,持水力和膨胀力达到最大,分别为8.37g/g和8.23 m L/g。     

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