检索结果-南通市图书馆

Interfacial microstructure and mechanical properties of Ti-6Al-4V/Al7050 joints fabricated using the insert molding method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1412-1423页

作者： Hong-xiang Li Xin-yu Nie Zan-bing He Kang-ning Zhao Qiang Du Ji-shan Zhang Lin-zhong zhuang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China SINTEF Materials and Chemistry Pb.124 BlindernNO-0314 OsloNorway IJmuiden Technology Centre Tata Steel Research&Development1970 CA IJmuidenThe Netherlands

Ti-6Al-4V/Al7050 joints were fabricated by a method of insert molding and corresponding interfacial microstructure and mechanical properties were investigated. The interfacial thickness was sensitive to holding temperature during the first stage, and a good metallurgical bonding interface with a thickness of about 90 μm can be obtained at 750°C. X-ray diffraction, transmission electron microscopy, and thermodynamic analyses showed that the interface mainly contained intermetallic compound TiAl_3 and Al matrix. The joints featured good mechanical properties, i.e., shear strength of 154 MPa, tensile strength of 215 MPa, and compressive strength of 283 MPa, which are superior to those of joints fabricated by other methods. Coherent boundaries between Al/TiAl_3 and TiAl_3/Ti were confirmed to contribute to outstanding interfacial mechanical properties and also explained constant fracture occurrence in the Al matrix. Follow-up studies should focus on improving mechanical properties of the Al matrix by deformation and heat treatment.

关键词： interfacial microstructure interfacial bonding mechanism mechanical properties insert molding method coherent boundaries Ti/Al joints

Source-specific risk assessment for cadmium in wheat and maize:Towards an enrichment model for China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第3期125卷 723-734页

作者： zhong zhuang Qiqi Wang Siyu Huang Andrea Giovanna NinoSavala Yanan Wan Huafen Li Andreas H.Schweiger Andreas Fangmeier Jürgen Franzaring Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation Key Laboratory of Plant-Soil Interactions of the Ministry of EducationCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China State Key Laboratory of North China Crop Improvement and Regulation Hebei Agricultural UniversityBaoding 071001China Institute of Landscape and Plant Ecology University of Hohenheim70599 StuttgartGermany

Cadmium (Cd) pollution of agricultural soil is of public concern due to its high potential toxicity and *** study aimed to reveal the risk of Cd accumulation in soil and wheat/maize systems,with a specific focus on the source-specific ecological risk,human health risk and Cd enrichment *** this we investigated more than 6100 paired soil and grain samples with 216 datasets including soil Cd contents,soil pH and grain Cd contents of 85 sites from *** results showed that mining activities,sewage irrigation,industrial activities and agricultural practices were the critical factors causing Cd accumulation in wheat and maize cultivated ***,mining activities contributed to a higher Cd accumulation risk in the southwest China and Middle Yellow River regions;sewage irrigation influenced the Cd accumulation in the North China *** addition,the investigated sites were classified into different categories by comparing their soil and grain Cd contents with the Chinese soil screening values and food safety values,*** enrichment models were developed to predict the Cd levels in wheat and maize *** results showed that the models exhibited a good performance for predicting the grain Cd contents among safe and warning sites of wheat (R2=0.61 and 0.72,respectively);while the well-fitted model for maize was prone to the overestimated sites (R2=0.77).This study will provide national viewpoints for the risk assessments and prediction of Cd accumulation in soil and wheat/maize systems.

关键词： Ecological risk Enrichment models Cadmium Health risk assessment Pollution sources

Children Establish Television Station

在线全文

学校读者我要写书评

暂无评论

Women of China 1995年第4期 38-39页

作者： zhuang zhong

The Beijing Donglu Primary School in Nanjing. Jiangsu

关键词： Jiangsu Nanjing

Dynamic Behaviors of Hydrogen in Martensitic T91 Steel Evaluated by Using the Internal Friction Method

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

Chinese Physics Letters 2013年第4期30卷 141-144页

作者： HU Jing WANG Xian-Ping zhuang zhong ZHANG Tao FANG Qian-Feng LIU Chang-Song Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031

Hydrogen atoms are electrochemically introduced into commercial martensitic T91 steel,and the hydrogen dynamic behaviors are investigated by internal friction(IF)technology.A complex spectrum with multicomponent peaks is detected in the hydrogen-charged T91 steel in the temperature range of 135–290 *** of peak configuration reveals that the multicomponent peaks consist of one relaxational peak and two non-relaxational *** mechanism of the wide relaxational component is ascribed to the combination of a hydrogen Snoek-like diffusion process and the interaction of hydrogen with movable dislocations,while the two non-relaxational peaks are preliminarily suggested to be caused by some kinds of transient processes related with hydrogen redistribution and *** binding energy of hydrogen to dislocation is determined to be about 0.19 eV.

关键词： steel friction martensitic

Comparisons of interface microstructure and mechanical behavior between Ti/Al and Ti-6Al-4V/Al bimetallic composites

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

China Foundry 2015年第1期12卷 1-8页

作者： Xin-yu Nie Kang-ning Zhao Hong-xiang Li Qiang Du Ji-shan Zhang Lin-zhong zhuang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing SINTEF Materials and Chemistry

The microstructure, interface thickness, element distribution and interfacial mechanical behavior of Ti-6Al-4V/Al couples prepared by an insert moulding method were investigated in depth in this paper. Moreover, Ti/Al bonding was also given as a comparison for understanding the interface bonding mechanism. It is shown that there is much thinner compact sub-layer for the interface of the Ti-6Al-4V/Al joint, whose morphology is obviously different from that of the Ti/Al joint. The Ti-6Al-4V/Al interface has been proven to contain a slight content of vanadium. Moreover, both the shear strength and the interface reaction rate of Ti-6Al-4V/Al compound materials are lower than those of the Ti/Al ones.

关键词： interface bonding insert moulding aluminum titanium intermetallic compounds mechanical behavior

Proteomic and phosphoproteomic analysis reveal threonine deficiency increases hepatic lipid deposition in Pekin ducks via reducing STAT phosphorylation

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第2期13卷 249-260页

作者： Yong Jiang zhong zhuang Wenqia Jia Zhiguo Wen Ming Xie Hao Bai Yulin Bi Zhixiu Wang Guobin Chang Shuisheng Hou Guohong Chen College of Animal Science and Technology Yangzhou UniversityYangzhou 225009China State Key Laboratory of Animal Nutrition Key Laboratory of Animal(Poultry)Genetics Breeding and ReproductionMinistry of Agriculture and Rural AffairsInstitute of Animal SciencesChinese Academy of Agricultural SciencesBeijing 100193China Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of ChinaInstitutes of Agricultural Science and Technology DevelopmentYangzhou UniversityYangzhou 225009China Key Laboratory of Feed Biotechnology of Ministry of Agriculture and Rural Affairs Institute of Feed ResearchChinese Academy of Agricultural SciencesBeijing 100081China

Dietary threonine(Thr)deficiency enhances triglyceride(TG)deposition in the liver of Pekin ducks,which injures hepatic function and impairs growth ***,the underlying molecular mechanisms remain *** the present study,we investigated the effects of dietary Thr deficiency on the expressions of proteins and phosphoproteins in liver of Pekin ducks,to identify the underlying molecular changes.A total of 300 one-day-old ducklings were divided into 3 groups with 10 replicates of 10 *** ducks were fed corn-wheat-peanut meal diets containing 0.46%,0.71%,and 0.96%Thr,respectively,from 1 to 21 days of *** performance,serum parameters,hepatic TG content,and expression of genes involved in lipid metabolism of Pekin ducks were determined.A Thr deficiency group(Thr-D,0.46%Thr)and a Thr sufficiency group(Thr-S,0.71%Thr)were selected for subsequent proteomic and phosphoproteomic *** results showed that Thr-D reduced the growth performance(P<0.001),and increased the plasma concentrations of cholesterol,high-density lipoprotein cholesterol,low-density lipoprotein cholesterol,and hepatic TG(P<0.05).Thr-D increased gene expression related to fatty acid and TG synthesis(P<0.05).A total of 176 proteins and 259 phosphosites(containing 198 phosphoproteins)were observed to be differentially expressed as a result of *** upregulated proteins were enriched in the pathway related to amino acid metabolism,*** down-regulated proteins were enriched in linolenic and arachidonic acid metabolism,and the Janus kinase-signal transducer and activator of transcription(JAK-STAT)signaling *** upregulated phos-phoproteins were enriched in the pathways related to fatty acid biosynthesis,fructose and mannose metabolism,and glycolysis/***-D reduced the phosphorylation of STAT1 at S729 and STAT3 at S728,and expression of *** contrast,Thr-D increased non-receptor tyrosine-protein kinase(TYK2)expression and STAT1 phosphoryla

关键词： Threonine deficiency Triglyceride accumulation Proteomic Phosphoproteomic Pekin duck

circ_1764的鉴定及其在鸡脂肪细胞分化中的功能预测

在线全文

学校读者我要写书评

暂无评论

中国家禽 2024年第8期46卷 14-21页

作者：庄重娄姬英杨婷王来娣江勇王志秀陈世豪毕瑜林陈国宏常国斌白皓扬州大学动物科学与技术学院江苏扬州225009 扬州大学农业科技发展研究院教育部农业与农产品安全国际合作联合实验室江苏扬州225009

为探究环状RNA circ_1764在鸡脂肪细胞分化中的重要作用,试验通过PCR扩增和RNase酶消化鉴定鸡circ_1764的存在特性,采用qRT-PCR技术检测circ_1764在鸡组织中的表达情况,利用Miranda、miRDB和Target Scan Human等网站预测鸡circ_1764的... 详细信息

为探究环状RNA circ_1764在鸡脂肪细胞分化中的重要作用,试验通过PCR扩增和RNase酶消化鉴定鸡circ_1764的存在特性,采用qRT-PCR技术检测circ_1764在鸡组织中的表达情况,利用Miranda、miRDB和Target Scan Human等网站预测鸡circ_1764的调控网络,使用DAVID软件可视化预测靶基因的GO和KEGG富集通路,最后通过转染过表达circ_1764载体,验证生物信息学筛选出的调控网络的准确性。结果显示:鸡体内存在circ_1764,并主要在细胞质中表达,在鸡心脏、肝脏、胸腺和脂肪组织中高表达;circ_1764的预测靶miRNA主要为miR-7441-3p、miR-1656、miR-6578-3p、miR-7452-5p、miR-6645-5p、miR-6563-3p、miR-6607-5p和miR-6581-5p,并且circ_1764在DF-1细胞中过表达可以显著降低上述miRNA的表达;circ_1764靶基因主要集中在代谢、泛素介导的蛋白水解以及MAPK通路中。本研究验证了鸡circ_1764的存在,通过生物信息学预测了鸡circ_1764的调控网络,初步探究circ_1764通过吸附miR-1656、miR-6645-5p等miRNA调控靶基因进而影响鸡脂肪细胞分化的分子机制,为进一步阐明circ_1764调控鸡脂肪细胞分化的机理奠定了基础。

关键词：鸡脂肪细胞 circ_1764 鉴定功能预测

基于自编码多层感知器的电力负荷管理终端运行故障诊断方法

在线全文

学校读者我要写书评

暂无评论

电力需求侧管理 2024年第2期26卷 113-118页

作者：朱亮亮滕姗姗徐辰冠庄重段梅梅苏慧玲国网电力科学研究院武汉能效测评有限公司武汉430074 国网电力科学研究院有限公司南京211106 国网江苏省电力有限公司营销服务中心南京210000

针对现有电力负荷管理终端运行故障辨识率低问题,提出一种基于自编码多层感知器的电力负荷管理终端运行故障诊断方法。首先,分析负荷管理终端运行状态指标与故障;其次,阐述自编码多层感知器电力负荷管理终端运行的故障诊断模型及其实现... 详细信息

针对现有电力负荷管理终端运行故障辨识率低问题,提出一种基于自编码多层感知器的电力负荷管理终端运行故障诊断方法。首先,分析负荷管理终端运行状态指标与故障;其次,阐述自编码多层感知器电力负荷管理终端运行的故障诊断模型及其实现方法,通过终端运行技术指标时序数据的等间隔式滑动窗口,操作获取表征终端运行状态特征候选集合,采用自编码器AE特征选择子模型,提取最优特征子集,借助多层感知器MLP故障诊断辨识子模型,实现终端运行故障分类诊断;最后,通过实验验证所提方法有效性。结果表明所提方法能提升电力负荷管理终端运行故障辨识精确率、召回率和辨识效率,实现电力负荷管理终端运行故障的精细化诊断。

关键词：故障诊断特征选择自动编码器多层感知机电力负荷管理终端

基于改进AUGMECON的配网虚拟电厂多目标优化运行

在线全文

学校读者我要写书评

暂无评论

电力需求侧管理 2024年第1期26卷 42-47页

作者：庄重孔月萍杨世海段梅梅周雨奇丁泽诚张汀荃国网江苏省电力有限公司营销服务中心南京210019

虚拟电厂可聚合配网末端的可调节负荷资源参与电力系统的调用以缓解面临的供需平衡等问题。同时末端资源功率的调节影响着配网的运行质量,负荷侧资源的调用可降低配网区域峰谷差,减少系统网损。为此,以配网运营商为主体构建虚拟电厂,提... 详细信息

虚拟电厂可聚合配网末端的可调节负荷资源参与电力系统的调用以缓解面临的供需平衡等问题。同时末端资源功率的调节影响着配网的运行质量,负荷侧资源的调用可降低配网区域峰谷差,减少系统网损。为此,以配网运营商为主体构建虚拟电厂,提出一种基于改进AUGMECON的配网虚拟电厂多目标优化模型,以运行效益、配网峰谷差和配网网损为目标函数,调用配网末端负荷资源参与需求响应,在提高运行收益的同时改善配网运行质量。通过改进AUGMECON获取所提多目标优问题的Pareto前沿,并采用考虑公平性的方法获取折中解。最后基于修改后的IEEE 33节点配电网系统进行了仿真分析,验证了所提模型的有效性。

关键词： AUGMECON2 虚拟电厂配电网多目标优化网损峰谷差