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Reactive ion etching of Si2Sb2Te5 in CF4/Ar plasma for a nonvolatile phase-change memory device
用于非易失性相变存储器中Si2Sb2Te5在CF4/Ar等离子体下的反应离子刻蚀

Li Juntao,Liu Bo,Song Zhitang,Yao Dongning,Feng Gaoming,He Aodong,Peng Cheng,Feng Songlin,<br>,刘波,宋志棠,姚栋宁,冯高明,何敖东,彭程,封松林
半导体学报 , 2013,
Abstract: Phase change random access memory (PCRAM) is one of the best candidates for next generation non-volatile memory, and phase change Si2Sb2Te5 material is expected to be a promising material for PCRAM. In the fabrication of phase change random access memories, the etching process is a critical step. In this paper, the etching characteristics of Si2Sb2Te5 films were studied with a CF4/Ar gas mixture using a reactive ion etching system. We observed a monotonic decrease in etch rate with decreasing CF4 concentration, meanwhile, Ar concentration went up and smoother etched surfaces were obtained. It proves that CF4 determines the etch rate while Ar plays an important role in defining the smoothness of the etched surface and sidewall edge acuity. Compared with Ge2Sb2Te5, it is found that Si2Sb2Te5 has a greater etch rate. Etching characteristics of Si2Sb2Te5 as a function of power and pressure were also studied. The smoothest surfaces and most vertical sidewalls were achieved using a CF4/Ar gas mixture ratio of 10/40, a background pressure of 40 mTorr, and power of 200 W.
Current Progress of Fabricating Tissue Engineering Scaffold using Rapid Prototyping Techniques
快速成形技术制造组织工程支架研究进展

Xiang Li,Chengtao Wang,<br>,王成
生物工程学报 , 2008,
Abstract: As one of the key factors for tissue engineering, scaffolds affect the spread and proliferation of seeded cells and the formation of new tissue. Although conventional methods can produce porous scaffolds with different porosities, they are lack controls the porous structures of the scaffolds. In recent years, rapid prototyping (RP) techniques have been developed and have successfully applied to fabricate TE scaffolds. RP techniques can provide accurate control over internal pore architectures and complex-shapes. As a result of these techniques, ideal tissue-engineered constructs could be prepared. This paper reviewed the advantages, potential and future directions of RP techniques in the design and fabrication of TE scaffolds.
A Preliminary Investigation of Semantic Presentation of Web-based Insurance Information
基于Web保险信息的语义分析初探

Jia Junzhi Liu Tao Li Jingfeng,<br>贾君枝 刘,景峰
现代图书情报技术 , 2006,
Abstract: 针对Web保险信息用户需求的准确性、连续性特点,原有基于关键词匹配的检索方式已不能适应用户的需求,因此试图应用框架语义学理论,从语义层次上对保险信息相关的词语及概念之间的关系进行分析,并从已建立好的保险理赔语料库中抽出一篇文本进行研究,描述其所需的部分框架及其关系,并提取文本框架相关语义信息,对文本进行语义标注。
SYNTHESIS AND SALT SOLUTION PROPERTIES OF ZWITTERIONIC COPOLYMER P(AM-co-VPPS) CONTAINING SULFOBETAINE GROUPS
含磺酸甜菜碱两性离子共聚物P(AM-co-VPPS)的合成及盐溶液性质

GUI Zhangliang,AN Quanfu,ZENG Juntao,XU Hong,QIAN Jinwen,<br>桂张良,安全福,,徐红,钱锦文
高分子学报 , 2009,
Abstract: 4-乙烯基吡啶(4-VP)与1,3-丙烷磺内酯在80℃下反应20 h,合成了4-乙烯基-1-(3-磺丙基)吡啶内嗡盐(4-VPPS);并在水溶液中与丙烯酰胺(AM)单体进行自由基共聚合,获得了同时含正负离子基团的磺酸甜菜碱两性离子共聚物P((AM-co-VPPS)); 采用红外光谱和1H-NMR对共聚物结构和组成进行了表征;进而考察了单体组成、引发剂用量、单体总浓度及反应温度对两性离子共聚物特性黏数的影响.通过考察单体投料比与共聚物组成的关系,利用Finemann-Ross和Kelen-Tudos方法,获得AM和4-VPPS单体对的竞聚率分别为2 01、8 71和1 99、8 44.共聚物溶液性质研究结果表明,P(AM-co-VPPS)在含NaCl和CaCl2的水溶液中的特性黏数都比纯水中的大,表现出明显的反聚电解质行为.特性黏数增加的程度随共聚物中4-VPPS单元的含量和水中盐浓度增加而增大; 当共聚物中4-VPPS摩尔含量为10 2%时,其在1 mol/L NaCl、2 mol/L NaCl 和2 mol/L CaCl2水溶液中特性黏数与在纯水中相比,分别增加47 3%、56 7%和56 8%.
快速成形技术制造组织工程支架研究进展
祥?,王成
生物工程学报 , 2008,
Abstract: 支架作为组织工程的关键要素之一,影响着所接种细胞的分布和增值以及新组织的形成。传统的方法虽然可以制造出各种孔隙率的支架,但缺乏对支架多孔结构的控制。近年来,快速成形技术发展迅速,并成功应用于组织工程支架的制造,实现了组织工程支架内部多孔结构与复杂外形的精确控制,从而使得构建理想的组织工程化结构体成为可能。以下回顾了应用快速成形技术制造组织工程支架的优势与潜力,展望了未来组织工程支架的设计制造发展方向。
Tribological Behavior of Articular Cartilage under Simulated Motion
关节软骨模拟运动摩擦磨损行为研究

LI Feng,LI Yuan-chao,Jia Xiao-feng,WANG Cheng-tao,<br>,元超,贾晓峰,王成
摩擦学学报 , 2011,
Abstract: The tribological behavior of bovine articular cartilage against stainless steel was evaluated by using an artificial knee joint simulation test bench in knee simulated motion. The influences of load and time on the tribological behavior of friction pair were investigated, and their worn surface was analyzed. The results showed that the width and depth of cracks in cartilage surface increased with the increase of the load from 640 to 1 000N. When time increased from 20 minutes to 1 h, the width and depth of cracks in cartilage surface increased. Iron was observed on the worn surface of articular cartilage ,indicating the material transfer. There were two kinds of wear particles, including metal wear particle in long strip shape and wear particle of cartilage composition in round shape.
Physiological effects of parasitization by Nasonia vitripennis on its host pupae of Boettcherisca peregrina
丽蝇蛹集金小蜂寄生棕尾别麻蝇的生理学效应

ZHANG Tao,ZHANG Zhong,LI Kai,YE Gong-yin,HU Cui,<br>张,张忠,,叶恭银,胡萃
浙江大学学报(农业与生命科学版) , 2005,
Abstract: The parasitization by Nasonia vitripennis (Hymenoptera: Pteromalidae) could result in marked changes in hemocyte population and composition and level of soluble proteins as well as the soluble sugar level in the hemolymph of Boettcherisca peregrina pupae. Total hemocyte counts and the counts of plasmatocyte and granulocyte were significantly larger in parasitized pupae than in unparasitized ones, while both levels of soluble proteins and soluble sugars in the hemolymph of parasitized pupae were found to be clearly lower than that in unparasitized ones. The SDS-PAGE electrophoresis showed some differences in the electrophoresis profile of hemolymph soluble proteins between parasitized and unparasitized pupae. The richness of three protein bands with molecular weight of 28 kD, 32 kD and 100 kD in parasitized pupae was significantly lower than that in unparasitized ones since the 2nd day after parasitism. The reverse was true for another protein band with molecular weight of about (14 kD.)
Methane uptake and oxidation by unsaturated soil
不饱和土壤CH_4的吸收与氧化

LI Jun,<br>
生态学报 , 2005,
Abstract: Unsaturated soils are the only known biogenic sinks of CH_4. In this paper we summarized the CH_4 oxidizing process in unsaturated soil and its influent factors. Methanotrophs can use atmospheric methane as the only source of carbon and energy because of the low critical concentration for methane oxidation. In General, CH_4 absorption rate is inversely proportional to soil moisture. The activity of methanotrophs becomes small if the transfer of CH_4 and O_2 from atmosphere to soils is prevented when soil mo...
An analysis of the factors affecting N2O emission from arable soils
农业土壤排放氧化亚氮的影响因素分析

Li Jun,<br>
中国生态农业学报 , 1995,
Abstract: Nitrous oxide(N2O)is an important greenhouse gas.This paper gives a summary about the effects of agricultural activities such as fertilizer application,irrigation,tillage,crop planting and changes of land use on N2O emission from soil. And measures for reducing N2O emission were also discussed.
THE SPATIAL PATTERN OF ENERGY DEMAND AND SUPPLY AND ITS FACTOR ANALYSIS
中国区域能源供求及其因素分析

Li Jun,<br>
资源科学 , 1994,
Abstract: his paper firstly examines the major changes in the spatial pattern of energy demand and supply in China between 1985 and 1990 and allocation of four severe energy shortage regions.It then indicates,by using a revised method of decomposition of energy consumption(RRS method),that the growth of energy consumption in those severe energy shortage regions could be primarily attributed to the, gross industrial growth and energy utilization efficiency while industrial structural energy saving played a minor role because of orientation of heavy and chemical industries in the process of regional industrialization and of constraints on regional reconstructuring. Some policy-oriented recommendations are finally derived.
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