龙葵果醋发酵工艺的研究

研究了以龙葵为原料,采用酵母菌和醋酸菌连续液态发酵生产龙葵果醋的发酵工艺.选择发酵温度为32℃,装样量为40%,接种量为20%的条件,可得到澄清的发酵果醋,陈酿后品质更佳.     

龙葵多糖提取分离工艺研究

采用水浴法设计三因素三水平正交试验,对龙葵多糖提取工艺进行研究;采用乙醇沉淀法设计三因素三水平正交试验对其分离工艺进行探索.正交试验结果表明:水浴法提取中三因素对龙葵多糖提取的影响顺序为:提取温度>料液比>提取时间,最佳提取工艺为:料液比1∶10,提取时间30 m in,提取温度80℃;乙醇沉淀法分离龙葵多糖中三因素的影响顺序为:乙醇浓度>沉淀时间>乙醇加入量,最佳分离工艺为:乙醇浓度90%,沉淀时间8 h,乙醇加入量3倍体积,这些条件的确定为龙葵的大规模开发和应用奠定了基础.     

一种新的环保型退镀液的研制

通过各种实验研制出一种新的环保型退镀液,退镀速度能达到2μm/min;镀层的溶解量大,1 kg退镀液可以退除镀层562.14 g;氮氧化物的消减率达98%以上.总之,该退镀液的研制为实现"绿色生产"的目标而迈进了一大步.     

用坑道废水加细菌堆浸采场废矿和选厂尾矿中铜的研究

用坑道废水加入5%—10%人工培养细菌液、堆浸某矿采场废矿、再用堆浸液搅拌浸出选厂含铜尾矿.浸出液用铁屑置换,生产海绵铜.废矿堆浸60—120d,铜浸出率达60%—88%;尾矿搅拌浸出15—30min,铜浸出率达73.83%,海绵铜品位为60%—81%.     

用啤酒废酵母生产调味品

利用啤酒生产的废酵母,可以开发生产许多调味品.一、生产营养酱油1.先将啤酒酵母经预处理,即加2倍无菌水稀释啤酒酵母,分别过70目、90目筛子筛分,再用高速离心分离得干燥啤酒酵母,然后加2倍体积5%酒石酸离心分离,再加2倍体积无菌水离心分离得干净废酵母.2.将干净废酵母 加数倍体积5%食盐水后,缓缓通入蒸气搅拌2h时升温到48℃保温6h,再缓升温到52℃左右,加木瓜蛋白酶搅拌30分钟,保温14h,再升温到65℃,保温4h,冷却静置24h,取上清液杀菌,加15%～16%食盐,1%苯甲酸钠、砂糖酱色,升温到80℃杀菌20min,杀菌结束前2min左右调入4%谷氨酸钠及10%食用酒精,杀菌结束后泵入冷却锅中冷却到常温,经过滤、灌装得成品.二、生产鲜厚调味料在啤酒酵母中加等量水,搅拌后离心分离,得洗净的啤酒酵母液(含菌体浓度20%),取2000g,加等量水,于60℃加热处理10min后离心分离,得轻液2300g(干物质浓度2.3%),用该轻液作调味料基质,配入下列鲜味物质即得到鲜味醇味厚的调味料.强度分别达,(?)卅,卌.配方实例:     

龙葵多糖对荷瘤小鼠脾指数和胸腺指数的影响

研究龙葵多糖对荷瘤小鼠脾指数和胸腺指数的影响,从免疫学角度初步探讨龙葵多糖的抗肿瘤药效学作用.实验采用MTT法观察龙葵多糖对Hep G-2和SGC-7901两种人肿瘤细胞的生长抑制作用.测定S180小鼠瘤重,H22荷瘤小鼠生存时间以及胸腺指数、脾指数等.实验结果表明龙葵多糖对Hep G-2细胞和SGC-7901细胞的IC50分别为189.60μg/m L和186.56μg/m L.龙葵多糖能够显著降低S180荷瘤小鼠平均瘤重,与阴性对照组比较具有显著性差异(P0.01),龙葵多糖能明显延长H22荷瘤小鼠的生存时间(P0.05或P0.01),显著提高荷瘤小鼠的胸腺指数和脾指数(P0.05或P0.01).表明龙葵多糖的肿瘤作用是通过改善机体免疫力实现的,而不是通过细胞毒作用发挥的.     

基于正交试验与星点设计—效应面法的桑枝总黄酮提取工艺研究

分别采用正交试验和星点设计—效应面法优选桑枝总黄酮的最佳提取工艺,分析了两种方法的差别并进行统计分析.星点设计优选出的最佳提取工艺为乙醇浓度50%、提取次数3次、提取时间120 min、液料比12 mL/g.正交试验优选出的最佳工艺为乙醇浓度50%、提取次数3次、提取时间60 min、液料比14 mL/g.星点设计—效应面法优选出的桑枝总黄酮提取工艺更符合工业实际生产,且较正交试验优选出桑枝总黄酮提取工艺更合理可行.     

RH真空处理GCr15轴承钢中全氧及显微夹杂物的行为研究

针对RH工艺生产轴承钢,通过现场试验研究了RH真空处理时间对钢中全氧和显微夹杂物的影响.试验结果表明,延长RH真空时间可以进一步降低钢中全氧和显微夹杂物的数量,RH脱氧主要是通过显微夹杂物的去除,全氧与显微夹杂物随时间的变化关系基本一致;真空处理25min可使钢液中全氧和显微夹杂降低约60%,比14min时多降低约13%,并得出邢钢轴承钢生产条件下,RH精炼过程钢液的表观脱氧速度系数为-0.036min-1;工艺优化后147炉轴承钢产品的平均全氧为6.7×10-6.     

龙葵糖蛋白对MCF -7细胞内[Ca2+]i的影响

研究龙葵糖蛋白对乳腺癌MCF -7细胞内[Ca2+]i的影响.通过MTT法测定龙葵糖蛋白对MCF -7细胞的细胞毒作用;Hoechst33258染色荧光显微镜下观察龙葵糖蛋白作用MCF -7细胞的形态学变化;采用Fluo - 3/AM探针标记,激光共聚焦技术观测龙葵糖蛋白对MCF -7细胞内[Ca2+]i的影响.结果表...     

铝酸钡净化拜耳赤泥洗液除硫试验研究

研究了用铝酸钡净化拜耳赤泥洗液的除硫条件和效果。当除硫条件为:B=100%,τ=20 min,T=75℃时,除硫率可高达94.5%.提出了铝酸钡净化高硫铝土矿高压溶出液除硫的生产实施推荐工艺流程。     

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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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.     

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