oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 226 )

2018 ( 3840 )

2017 ( 3949 )

2016 ( 4618 )

Custom range...

Search Results: 1 - 10 of 340110 matches for " 王永卫 "
All listed articles are free for downloading (OA Articles)
Page 1 /340110
Display every page Item
和谐社会:马克思主义文化哲学视域中的宏观解读及现实思考
,亮?
天府新论 , 2008,
Abstract: "和谐社会"虽然具有某些阶段性特征,但其实质乃是人的全面发展,终极理想即为马克思所说的"自由人的联合体"。而在达成"自由人联合体"的过程中,必须经历"人的依赖关系"和"以物的依赖性为基础的人的独立性"两个必不可少的环节。从文化哲学的视角看,即体现为文化模式由"群体本位"向"个体本位"再到"类本位"的历史转换。由此,和谐社会的文化建设也应认清方向,找准坐标,努力向着"自由人联合体"的目标迈进。
The Metods of VIRN Membership Information Dissemination and their Comparison
VPRN成员信息传播方法及比较

,周明天
计算机科学 , 2000,
Abstract: VPRN is the most complicated type of VPN. The first step to construct a VPRN is to disseminate the membership mformation.This paper introduces some methods of dissemination with the emphasis on analyzing and comparing them.
轴向约束高强度Q460钢柱抗火性能试验研究
,葛勇
建筑结构学报 , 2015,
Abstract: 为了获得高强度Q460钢柱的抗火性能,对4根轴向约束高强度Q460钢焊接H形截面柱进行了抗火性能试验。试验采用恒载升温模式,升温曲线为ISO834标准升温曲线,考虑了两种轴向约束刚度和两个级别的荷载比。试验测量了轴向约束高强度Q460钢柱受火过程中的温度、轴向位移和跨中挠曲变形。根据试验结果得到了轴向约束高强度Q460钢柱的屈曲和破坏时的温度。采用轴向约束钢柱的轴力放大系数方法计算了试验构件的破坏温度,并和试验结果进行了对比,同时还对轴向约束高强度Q460钢柱和普通Q235钢柱的抗火性能的差异进行了比较。研究表明:轴向约束刚度和荷载比对高强度Q460钢柱的抗火性能影响较大;相同荷载比下,轴向约束刚度大的高强度Q460钢柱破坏温度低;相同约束刚度下,荷载比大的轴向约束高强度Q460钢柱破坏温度低。采用轴力放大系数方法可以较准确地确定轴向约束高强度Q460钢柱的破坏温度。相同荷载比下,相同约束刚度和几何尺寸的高强Q460钢柱比普通Q235钢柱具有更好的抗火性能。
约束高强度Q460钢柱抗火性能试验
,葛勇
哈尔滨工业大学学报 , 2015, DOI: 10.11918/j.issn.0367-6234.2015.12.016
Abstract: 为获得高强度Q460钢柱的抗火性能,采用火灾试验炉对4个约束Q460钢柱进行抗火性能试验,试验采用恒载升温模式和ISO-834标准升温曲线,考虑了两个约束刚度和两个荷载比,测量了钢柱受火过程中的温度、轴向位移和跨中挠度,并得到了约束Q460钢柱的屈曲温度和破坏温度,采用约束钢柱的轴力放大系数方法计算了试件的破坏温度并和试验结果进行对比.研究表明:轴向约束刚度和荷载比对Q460钢柱的抗火性能影响较大,相同荷载比下轴向约束刚度大的钢柱破坏温度低,相同约束刚度下荷载比大的钢柱破坏温度低;轴力放大系数方法可以确定约束高强度Q460钢柱的临界温度.
横向荷载作用下钢柱厚型防火涂料破损试验
,李国强
哈尔滨工业大学学报 , 2010, DOI: 10.11918/j.issn.0367-6234.2010.12.024
Abstract: 为研究钢柱上厚型防火涂料在外力作用下的破坏规律,进行了3个钢柱在外力作用下的防火涂料破损试验,研究H型钢柱上的厚型防火涂料分别在单向加载和往复加载作用下的破坏现象和破坏模式,并对试验结果进行分析.结果表明:防火涂料和界面剂之间以及界面剂和钢板之间的粘结性能差,钢柱受外力作用后粘结很容易破坏.单向加载的钢柱,在受拉翼缘上,初始裂缝间距逐渐加大并会产生新的横向裂缝,柱底部防火涂料脱落;在受压翼缘上,初始干缩裂缝逐渐闭合,柱底的防火涂料被压碎.往复加载的钢柱,粘结更容易破坏.外力作用下,钢柱上防火涂料容易破损,下端翼缘上破损严重,破损模式为大片剥离和脱落,破损程度和柱顶水平荷载有关,腹板上的防火涂料基本完好.
vprn成员信息传播方法及比较
周明天?
计算机科学 , 2000,
Abstract:
粗糙集模型的拓广
The Extension of the Rough Set Model
 [PDF]

梦洁, 许爱琴,,
Computer Science and Application (CSA) , 2013, DOI: 10.12677/CSA.2013.34039
Abstract:
由于信息的不完备以及论域上的二元关系常常是不等价的,需要将经典粗糙集模型进行扩充。一方面,将粗糙集模型中等价关系泛化为容差关系或包含关系,可将粗糙集模型的适用范围扩大,在此基础上研究其上、下近似算子,并通过案例对比两种关系的差别;另一方面,从基本知识粒度的构造和知识的表示方法上,研究基于邻域系统和粒度两个方面的上、下近似算子。
Because of the incomplete information and inequivalent binary relation on the domain, the classic rough set model will need to be expanded. On the one hand, the equivalence relations of the rough set model is extended to tolerance relations or inclusion relations, which can extend the application range. This paper studies high and low approximation operators on the basis of this method and compares with the two kinds of relations through case analysis. On the other hand, on the basic of granularity of knowledge structure and knowledge representation method, it studies the approximation operators from two aspects of neighborhood system and granularity.
绞股蓝总皂苷提取和纯化工艺的优化
Process Optimization of Extraction and Purification on Gypenosides
 [PDF]

,, 段金婷, 汤胜楠, 高大威
Hans Journal of Chemical Engineering and Technology (HJCET) , 2013, DOI: 10.12677/HJCET.2013.31004
Abstract: 以五叶绞股蓝的梗和叶、七叶绞股蓝的叶为材料,用水提法和微波干辅助醇提法从中提取了绞股蓝总皂苷,比较了其提取物中总皂苷含量的差异,并分别用HP20大孔吸附树脂柱层析法和石油醚萃取法对提取的绞股蓝总皂苷进行了纯化,比较了两种纯化方法的效果。结果表明七叶绞股蓝叶提取物中的总皂苷含量最高,五叶绞股蓝叶次之,五叶绞股蓝梗最低;微波干辅助醇提的效率高于水提法;本实验中微波醇提–石油醚萃取纯化七叶绞股蓝叶提取物得到的样品中总皂苷的含量最高为89.76%;水提-HP20柱层析法纯化七叶绞股蓝叶提取物得到的样品中总皂苷的含量为76.40%。
Gypenosides were extracted from the leaf and stems of five-leave gynostemma and the leaf of seven-leave gynostemma using water extraction and microwave-assisted alcohol extraction. Meanwhile, gypenosides content’s dif- ferences were compared among them, and then the extracted gypenosides were purified by HP20 macroporous resin column chromatography and petroleum ether extraction, the effects of two purification methods were compared. The results show that the gypenosides’ content of the leaf of seven-leave gynostemma was the most, the leaf of five-leave gynostemma followed and the stems of five-leave gynostemma pentaphyllum was the least. Microwave-assisted alcohol extraction is more efficient than the water extraction method. Water extracted gypenosides and purified by HP20 col- umn chromatography is higher than the efficiency of petroleum ether extraction. In this study, the gypenosides’ content from the leaf of seven-leave gynostemma by microwave-assisted ethanol extraction-petroleum ether extraction purified is the most, up to 89.76%; the gypenosides’ content from the leaf of seven-leave gynostemma by water extraction-HP20 column chromatography is 76.40%.
吞吐型湖泊湖滩的地形遥感反演方法—以中国江西省鄱阳湖为例
Bathymetry Mapping of Alternately Filled Lake Using Multi-Temporal Satellite Images
 [PDF]

张思宇, 金元, 蒙亚平, 刘传,
Geographical Science Research (GSER) , 2013, DOI: 10.12677/GSER.2013.22007
Abstract:
吞吐型湖泊局部地貌变化快速,水动力环境复杂,较为准确、快速地获取吞吐型湖泊湖滩地形信息对于相关湖滩研究、湖滩管理保护与发展具有重大意义。研究基于多时相遥感影像,反演鄱阳湖(典型吞吐型湖泊) 2010年湖滩地形。研究从2010年33幅具有相对连续水位信息的遥感影像中获取水边线;将水边线离散成点后与相应时刻的水位信息内插,进而构建湖滩DEM。通过相对比较与绝对比较的方法进行验证,结果表明:采用该方法构建的鄱阳湖湖滩DEM垂直误差为25.1 cm,精度满足要求。因此,该方法对于构建吞吐型湖泊湖滩地形具有一定适用性。
Alternately filled lake is known for its rapid change terrain and complex hydrodynamic environ-ment. More accurate and rapid access to its topographic map is of great significance to relative research, management, protection and development of its lake beach. This paper tries to derive the bottom topography of Poyang Lake (a typical alternately filled lake) in 2010 based on multi-temporal satellite images. To build the lake beach DEM, waterlines were detected using 33 satellite images acquired at continuous elevations in 2010, and then discretized to point to interpolate with water levels at corresponding moment. Both relative and absolute validation results show that the average height error of DEM derived using this method is 25.1 cm, which is within the precision requirement. All of these findings proved the feasibility of this method to construct the topographic map for alternately filled lake.
加强中药资源管理的建议
,
中国中药杂志 , 2006,
Abstract: 中国是一个资源大国,也是一个人口大国。从资源总量上看,我国是资源富国,但从人均占有量上看,我国是资源不足的国家。随着中国人口不断增长和经济的不断发展,我国将有可能全面进入资源匮乏时代。《吕氏春秋·义赏》说:“竭泽而渔,岂不得鱼,而明年无鱼;焚薮而田,岂不获得,而明年无兽。”明确地指出了资源的有限性及保护与合理利用开发资源的重要性。20世纪90年代初期,西方国家为了治疗癌症从我国大量进口紫杉醇原料,导致在我国西....
Page 1 /340110
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.