检索结果-南通市图书馆

Simultaneous refinement of α-Mg grains and β-Mg_(17)Al_(12) in Mg-Al based alloys via heterogeneous nucleation on Al_(8)Mn_(4)Sm

引用

Journal of Magnesium and Alloys 2023年第1期11卷 348-360页

作者： Jun-Chen Chen Mei-Xuan Li zhi-yang yu Zhao-yuan Meng Cheng Wang zhi-Zheng yang Hui-yuan Wang State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012PR China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Jilin UniversityNanling CampusNo.5988 Renmin StreetChangchun 130025PR China International Center of Future Science Jilin UniversityChangchun 130012PR China

Due to the significant differences in the formation temperature and crystal structure between the primaryα-Mg and eutecticβ-Mg_(17)Al_(12),it is a great challenge to achieve simultaneous refinement of the primary and eutectic phases in Mg-Al based alloys via heterogeneous ***,we found that theα-Mg andβ-Mg_(17)Al_(12) in the AZ80 alloy can be simultaneously refined after 0.2 wt.%Sm addition,with the grain size decreasing from∼217±15μm to∼170±10μm and theβ-Mg_(17)Al_(12) morphology changing from a typical continuous network to a nod-like or spherical *** simultaneous refinement mechanism is investigated through solidification simulation,transmission electron microscopy(TEM),and differential thermal analysis(DTA).In the AZ80-0.2Sm alloy,many Al8Mn4Sm particles can be observed near the center of theα-Mg grains or inside theβ-Mg_(17)Al_(12).Crystallographic calculations further reveal that the Al8Mn4Sm has good crystallographic matching with both theα-Mg andβ-Mg_(17)Al_(12),so it possesses the potency to serve as heterogeneous nucleation sites for both *** promoted heterogeneous nucleation on the Al8Mn4Sm decreases the undercooling required by the nucleation of the primary and eutectic phases,which enhances the heterogeneous nucleation rate,thus causing the simultaneous refinement of theα-Mg andβ-Mg_(17)Al_(12).The orientation relationships between the Al8Mn4Sm and Mg/Mg_(17)Al_(12) are identified,which are[1210]_(Mg)//[010]_(Al8Mn4Sm),(1010)_(Mg)//(301)_(Al8Mn4Sm) and[112]_(Mg_(17)Al_(12))//[010]_(Al8Mn4Sm),(110)_(Mg_(17)Al_(12))//(301)_(Al8Mn4Sm),***,the refinement of theβ-Mg_(17)Al_(12) accelerates its dissolution during the solution treatment,which is beneficial for cost saving in industrial *** Al8Mn4RE compounds such as Al8Mn4Y might have the same positive effect on the simultaneous refinement due to the similar physicochemical properties of rare earth *** work not only proves the po

关键词： Magnesium alloys Microstructure refinement Primaryα-Mg Eutecticβ-Mg_(17)Al_(12) Rare earth Heterogeneous nucleation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A New Interface Anisotropic Potential of Zinc-Blende Semiconductor Interface Induced by Lattice Mismatch

引用

Chinese Physics Letters 1999年第1期16卷 56-58页

作者： CHEN Yong-hai WANG Zhan-guo yang zhi-yu Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 Department of Physics the Hong Kong University of Science and TechnologyKowloonHong Kong

A new interface anisotropic potential,which is proportional to the lattice mismatch of interfaces and has no fitting parameter,has been deduced for(001)zinc-blende semiconductor *** comparison with other interface models is given for GaAs/AlAs and GaAs/InAs *** strong influence of the interface anisotropic potential on the inplane optical anisotropy of GaAs/AlGaAs low dimensional structures is demonstrated theoretically within the envelope function approximation.

关键词： interface Lattice Zinc

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modulating the Oxidation Degree of Linear Polyethyleneimine for Preparation of Highly Efficient and Low-cytotoxicity Degradable Gene Delivery Carriers

引用

Chinese Journal of Polymer Science 2024年第11期42卷 1699-1709,I0008页

作者： Xiao-Ya Guo zhi-yu yang Hua-Pan Fang Dan-Hua Zhou Xuan Pang Hua-yu Tian Xue-Si Chen Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361005China

Polyethyleneimine(PEI),as a widely used polymer material in the field of gene delivery,has been extensively studied for modification and shielding to reduce its ***,research aimed at preparing degradable PEI is *** this work,the hydrogen peroxide(H_(2)O_(2))oxidation method was used to introduce degradable amide groups in the PEI and a series of oxidized PEI22k(oxPEI22k)with different degrees of oxidation were synthesized by regulating the dosage of H_(2)O_(2).The relationship between the oxidation degree of oxPEI22k and the gene transfection efficiency of oxPEI22k was studied in detail,confirming that the oxPEI22k with oxidation degrees of 16.7%and 28.6%achieved improved transfection efficiency compared to unmodified *** oxPEI22k also proved reduced cytotoxicity and improved ***,this strategy was extended to the synthesis of low-molecular-weight *** oxPEI1.8k with suitable oxidation degree also achieved improved transfection efficiency and reduced *** brief,this work provided high-efficiency and low-cytotoxicity degradable gene delivery carriers by regulating the oxidation degree of PEI,which was of great significance for promoting clinical applications of PEI.

关键词： Polyethyleneimine Gene delivery Gene transfection Degradable gene carriers

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Characterization of Thermoplastic Poly(Ester Amide)s Elastomer (TPEaE) Obtained from Recycled PET

引用

Journal of Renewable Materials 2021年第5期9卷 867-880页

作者： zhi-yu yang Yi-Ling Chou Hao-Chun yang Chin-Wen Chen Syang-Peng Rwei Institute of Organic and Polymeric Materials Research and Development Center of Smart Textile TechnologyNational Taipei University of TechnologyTaipei10608Taiwan

A series of thermoplastic polyester elastomer (TPEE) and thermoplastic poly(ester amide)s elastomer (TPEaE)copolymers were obtained by depolymerizing PET (polyethylene terephthalate) by which the waste PET canbe efficiently recovered and recycled into value-added products from a practical and economical point of *** structure of TPEE and TPEaE was identified using nuclear magnetic resonance (NMR) and Fourier transforminfrared spectroscopy (FT-IR). Differential scanning calorimetry (DSC) data showed that the melting temperature(Tm) decreased with the amide content increased. The glass transition temperature (Tg) was increased as introducingthe amide group, and the formation of amide-ester and amide-amide hydrogen bonds increased the intermolecularchain force. The intrinsic viscosity (η) showed the tendency of increment from TPEE (0.53 dL g^(−1)) to TPEaE-5%(0.72 dL g^(−1)) due to the reinforcement of hydrogen bond and chain entanglement.

关键词： Recycle polyethylene terephthalate(r-PET) depolymerization thermalplastic poly(ester amide)s copolymer(TPEaE)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Characterization of ploidy levels in Chrysanthemum L. by flow cytometry

引用

Journal of Forestry Research 2015年第3期26卷 771-775页

作者： yue-ping Ma Jiang-xue Wei zhi-yang yu Bing Qin Si-lan Dai College of Life and Health Sciences Northeastern University College of Landscape Architecture Beijing Forestry University

Analyzing the ploidy levels of plants is important for identifying species, selecting parental lines, identifying the relationships between species, and determining evolutionary patterns. The genus Chrysanthemum is widely distributed throughout the world and exhibits different ploidy levels. We used flow cytometry to analyze the ploidy levels of nine species of Chrysanthemum L. collected from different regions and geographical locations in China. Three diploids from Henan and Wuhan provinces corresponded to Chrysanthe- mum lavandulifolium and two species of C. nankingense, while three tetraploids from various regions corresponded to C. indicum and two species of C. chanetii. Two hexaploids corresponding to C. vestitum were collected at Funiu moun- tain （Henan province）, and C. zawadskii was collected at Huangshan mountain （Anhui province）. We found that OTTO extraction buffer was suitable for extracting nuclei from most species, apart from C. zawadskii. Flow cytometry proved to bea simple, rapid, and highly accurate method for identifying ploidy levels in Chrysanthemum species.

关键词： Chrysanthemum L. Flow cytometry - OTTOextraction buffer Ploidy identification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lithofacies palaeogeography of the Carboniferous and Permian in the Qinshui Basin, Shanxi Province, China

引用

Journal of Palaeogeography 2015年第4期4卷 387-413页

作者： Long-Yi Shao zhi-yu yang Xiao-Xu Shang Zheng-Hui Xiao Shuai Wang Wen-Long Zhang Ming-Quan Zheng Jing Lu State Key Laboratory of Coal Resources and Safe Mining School of Geosciences and Surveying Engineering China University of Mining and Technology (Beijing) Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and Technology No.105 Geological Brigade of Qinghai Administration of Coal Geology Fujian Institute of Geological Survey

The Qinshui Basin in the southeastern Shanxi Province is an important area for coalbed methane（CBM） exploration and production in China, and recent exploration has revealed the presence of other unconventional types of gas such as shale gas and tight sandstone gas. The reservoirs for these unconventional types of gas in this basin are mainly the coals, mudstones, and sandstones of the Carboniferous and Permian; the reservoir thicknesses are controlled by the depositional environments and palaeogeography. This paper presents the results of sedimentological investigations based on data from outcrop and borehole sections, and basin-wide palaeogeographical maps of each formation were reconstructed on the basis of the contours of a variety of lithological parameters. The palaeogeographic units include the depositional environments of the fluvial channel, flood basin（lake）, upper delta plain, lower delta plain, delta front, lagoon, tidal flat, barrier bar, and carbonate *** Benxi and Taiyuan Formations are composed mainly of limestones, bauxitic mudstones,siltstones, silty mudstones, sandstones, and economically exploitable coal seams, which were formed in delta, tidal flat, lagoon, and carbonate platform environments. The Shanxi Formation consists of sandstones, siltstones, mudstones, and coals; during the deposition of the formation, the northern part of the Qinshui Basin was occupied mainly by an upper delta plain environment, while the central and southern parts were mainly occupied by a lower delta plain environment and the southeastern part by a delta front environment. Thick coal zones occur in the central and southern parts, where the main depositional environment was a lower delta plain. The thick coal zones of the Taiyuan Formation evidently occur in the sandstone-rich belts, located mainly in the lower delta plain environment in the northern part of the basin and the barrier bar environments in the southeastern part of the basin. In contrast, the thick

关键词： palaeogeography Shanxi Province Qinshui Basin Shanxi Formation Taiyuan Formation coal measure coalbed methane Permian Carboniferous

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

供应链企业间的委托代理问题研究

引用

计算机集成制造系统-CIMS 2001年第1期7卷 19-22页

作者：杨治宇马士华华中科技大学湖北武汉430074

信息不对称引起委托代理问题。供应链企业间由于信息不对称也存在委托代理问题。本文从制造商和供应商的角度出发 ,分析了供应链企业中的委托代理问题的特征 ,研究了有害选择和道德风险两类问题 ,结合供应链实际提出风险分担和激励机制... 详细信息

信息不对称引起委托代理问题。供应链企业间由于信息不对称也存在委托代理问题。本文从制造商和供应商的角度出发 ,分析了供应链企业中的委托代理问题的特征 ,研究了有害选择和道德风险两类问题 ,结合供应链实际提出风险分担和激励机制设计的方案 ,还对供应链企业间委托代理问题的未来研究做了预测和建议。

关键词：供应链委托代理道德风险激励机制企业

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of Y2O3 nanoparticles on reducing the content of tar in cigarettes

引用

Journal of Chemistry and Chemical Engineering 2007年第1期1卷 17-20页

作者： yang zhi-hong yang zhi-yu yu Xiao-bin XU Fei-guang WANG Chang-long NIE Ji-lan School of Material Science and Engineering Nanchang University Nanchang 330031 China Guangfeng Cigarette Factory Guangfeng 334600 China Patent Routine Institute of Jiangxi Nanchang 330047 China

Y2O3 nanoparticles prepared in microemulsion, which were sprayed on cut tobacco, can reduce tar in cigarettes effectively. Reducing the content of tar in many brands of cigarettes was studied. The results show that Y2O3 nanoparticles can reduce tar in cigarettes effectively and have no influence on nicotine when the addition of Y2O3 nanoparticles is 0,5-1.2%. The smaller the grain size of Y2O3 nanoparticles is,the more effective tar reduction is. The principle of reducing tar in cigarettes is studied preliminarily.

关键词： Y2O3 nanoparticles cigarette tar content

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国城市影像的当代演进及书写——论新时期以来西安电影制片厂的城市电影

引用

艺术百家 2019年第1期37卷 130-137页

作者：杨致远陕西师范大学新闻与传播学院陕西西安710119

从20世纪80年代至世纪之交,西安电影制片厂是推动中国当代电影走向世界的重要力量,城市电影是其电影创作中的重要部分。滕文骥、黄建新、周晓文等第五代导演从不同的思考面出发,创作出诸多在题材、主题、形式风格等方面迥异的影片,表现... 详细信息

从20世纪80年代至世纪之交,西安电影制片厂是推动中国当代电影走向世界的重要力量,城市电影是其电影创作中的重要部分。滕文骥、黄建新、周晓文等第五代导演从不同的思考面出发,创作出诸多在题材、主题、形式风格等方面迥异的影片,表现出与张艺谋、陈凯歌等同代导演不同的创作旨趣。进入20世纪90年代,张元、张扬、施润玖等第六代导演的创作更加多元化,对于城市生活及城市人存在境遇更具反思意识。西影厂的这些城市电影既是中国当代城市影像演进过程的书写痕迹,也是表征当代中国社会城市化进程的重要影像文本。

关键词：新时期西安电影制片厂城市空间城市电影

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国成人高校兼职教师队伍的建设及发展

引用

成人教育 2016年第7期36卷 57-63页

作者：杨之瑜上海开放大学上海200082

成人高等教育是社会经济发展的巨大杠杆、是社会发展的推进器、是调节社会人才结构的重要途径、是社会主义精神文明建设的重要基地,也是我国教育体系的重要组成部分。随着时代的发展,成人高校中的兼职教师队伍所肩负的使命及扮演的角色... 详细信息

成人高等教育是社会经济发展的巨大杠杆、是社会发展的推进器、是调节社会人才结构的重要途径、是社会主义精神文明建设的重要基地,也是我国教育体系的重要组成部分。随着时代的发展,成人高校中的兼职教师队伍所肩负的使命及扮演的角色也在不断地变化和转型。

关键词：成人高校兼职教师综述

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：