检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 651-661页

作者： qi-Ming wang Yan-Jie Zhang dong Han xiao-Wu Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Uniaxial tensile tests were carried out at room temperature(RT)and 250℃,respectively,to investigate the effect of shortrange ordering(SRO)on the mechanical properties and deformation micromechanism of fine-grained(FG)Cu–Mn alloys with high stacking fault *** results show that at RT,with the increase in SRO degree,the strength of FG Cu–Mn alloys is improved without a loss of ductility,and corresponding deformation micromechanism is mainly manifested by a decrease in the size of dislocation *** contrast,at a high temperature of 250℃,the SRO degree becomes violently enhanced with increasing Mn content,and the deformation microstructures thus transform from dislocation cells to planar slip bands and even to deformation twins,significantly enhancing the work hardening capacity of the alloys and thus achieving a better strength-ductility synergy of FG Cu–Mn alloys.

关键词： Fine-grained Cu–Mn alloy Short-range ordering Stacking fault energy Temperature Strength-ductility synergy Deformation micromechanism

Alloying Design for High Wear-Resistant Cast Hot-Forging Die Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2008年第4期15卷 67-72页

作者： CUI xiang-hong SHAN Jun YANG Zi-run WEI Min-xian wang Shu-qi dong Chuang School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 Jiangsu China Harbin Zhuoyue Information Technology Advance Limited Company Harbin 150001 Heilongjiang China State Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian 116024 Liaoning China

The alloying design of cast hot-forging die steels was analyzed. The relationship of the life of cast hot-forging dies with the failure patterns was studied. The thermal wear resistance was believed to be the key property for the alloying design of cast hot-forging die steels. The alloying design parameters were selected and optimized for the cast hot-forging die steel with high wear resistance. The wear resistance of the optimized cast die steel was evaluated in comparison with commercial H13 steels and 3Cr2WSV steel. In the new cast hot-forging die steel, VC is predominant carbide with Cr and Mo as the main solution elements in α-Fe. It is found that the cast die steel has significantly lower wear rate than normal H13 steel and 3Cr2W8V steel, almost the same as that of high purity H13 steel. The high wear resistance of the new cast hot-forging die steel can be attributed to its reasonable alloying design and nonsensibility to the detrimental function of S and P.

关键词： hot-forging die cast steel wear resistance alloying design

Freeze-thaw process induced by increased precipitation affects root growth of alpine steppe on the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2023年第10期20卷 3010-3017页

作者： qiN xiao-jing NIE xiao-jun wang xiao-dan hong Jiang-tao School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuo 454003China Key Laboratory of Mountain Environment Evolution and Regulation Institute and Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 640016China

The response of vegetation productivity to precipitation is becoming a worldwide *** reports on responses of vegetation to precipitation trends are based on the growth *** the soil freeze/thaw process,the soil water phase and heat transport change can affect root growth,especially during the thawing process in early spring.A field experiment with increased precipitation(control,increased 25%and increased 50%)was conducted to measure the effects of soil water in early spring on above-and below-ground productivity in an alpine steppe over two growing seasons from June 2017 to September *** increased 50%treatment significantly increased the soil moisture at the 10 cm depth,there was no difference in soil moisture between the increased 25%treatment and the control in the growing season,which was not consistent in the freeze/thaw *** soil moisture during the non-growing season retarded root *** precipitation in the freezing-thawing period can partially offset the difference between the control and increased precipitation plots in both above-and below-ground biomass.

关键词： Freeze-thaw process Precipitation Root length Plant coverage Alpine grassland

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO_(2) fillers for high-performance all solid-state lithium metal batteries

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1636-1646页

作者： tao Wei Zao-hong Zhang qi Zhang Jia-hao Lu qi-ming Xiong Feng-yue wang Xin-ping Zhou Wen-jia Zhao xiang-yun qiu School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Mechanics and Energy National Research Ogarev Mordovia State UniversitySaransk 430000Russia Jiangsu University Jingjiang College Zhenjiang 212003China Department of Chemistry College of ScienceNanjing Agricultural UniversityNanjing 210095China Power&Energy Storage System Research Center College of Mechanical and Electrical EngineeringQingdao UniversityQingdao 266071China

Anion-immobilized solid composite electrolytes(SCEs)are important to restrain the propagation of lithium dendrites for all solid-state lithium metal batteries(ASSLMBs).Herein,a novel SCEs based on metal-organic frameworks(MOFs,UiO-66-NH_(2))and superacid ZrO_(2)(S-ZrO_(2))fillers are proposed,and the samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),thermo-gravimetric analyzer(TGA)and some other electrochemical ***-NH_(2) groups of UiO-66-NH_(2) combines with F atoms of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)chains by hydrogen bonds,leading to a high electrochemical stability window of 5 *** to the incorporation of UiO-66-NH_(2) and S-ZrO_(2) in PVDF-HFP polymer,the open metal sites of MOFs and acid surfaces of S-ZrO_(2) can immobilize anions by strong Lewis acid-base interaction,which enhances the effect of immobilization anions,achieving a high Li-ion transference number(t_(+))of 0.72,and acquiring a high ionic conductivity of 1.05×10^(-4) S·cm^(-1) at 60℃.The symmetrical Li/Li cells with the anion-immobilized SCEs may steadily operate for over 600 h at 0.05 mA·cm^(-2) without the shortcircuit ***,the solid composite Li/LiFePO_(4)(LFP)cell with the anion-immobilized SCEs shows a superior discharge specific capacity of 158 mAh·g^(-1) at 0.2 *** results illustrate that the anion-immobilized SCEs are one of the most promising choices to optimize the performances of ASSLMBs.

关键词： solid composite electrolytes poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) all solid-state lithium metal batteries metal-organic frameworks anion-immobilized

A Unified Theoretical Treatment on Statistical Properties of the Semi-batch Self-condensing Vinyl Polymerization System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第11期39卷 1510-1520页

作者： Fang Gu Jiang-tao Li xiao-Zhong hong Hai-Jun wang College of Chemistry and Environment Science Hebei UniversityBaoding 071002China College of Physical Science and Technology Hebei UniversityBaoding 071002China Chemical Biology Key Laboratory of Hebei Province Hebei UniversityBaoding 071002China Key Laboratory of Medicinal Chemistry and Molecular Diagnosis Ministry of EducationHebei UniversityBaoding 071002China

We present a novel generating function(GF)method for the self-condensing vinyl polymerization(SCVP)system with any initial distribution of preexisted *** a method was proven to be especially useful to investigate the semi-batch SCVP system allowing a sequence of feeding operations during the ***,the number-,weight-,and z-average molecular weights as well as dispersity index of hyperbranched polymers can be explicitly given,which are determined by predetermined feeding details and conversions in each polymerization *** analytical results are further confirmed by the corresponding Monte Carlo ***,the present GF method has provided a unified treatment to the semi-batch SCVP ***,hyperbranched polymers with desired properties can be prepared by designing feeding details and presetting conversions at each step based on the present GF method.

关键词： Self-condensing vinyl polymerization Semi-batch Generating function Statistical properties

Mn、Zn、Sn掺杂CsPbI_(3)的稳定性和光电性质研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第2期42卷 182-188页

作者：张仁杰陶红帅郝启圣内蒙古工业大学理学院呼和浩特010051

采用基于密度泛函理论的第一性原理,计算了本征CsPbI_(3)和Mn、Zn、Sn掺杂体系的形成能、电子结构和光学性质.研究结果表明:Mn、Zn、Sn的掺入减小了材料晶格常数,Mn原子掺入CsPbI_(3)晶体结构使得体系的磁矩由0变为5.00μ_(B),丰富了材... 详细信息

采用基于密度泛函理论的第一性原理,计算了本征CsPbI_(3)和Mn、Zn、Sn掺杂体系的形成能、电子结构和光学性质.研究结果表明:Mn、Zn、Sn的掺入减小了材料晶格常数,Mn原子掺入CsPbI_(3)晶体结构使得体系的磁矩由0变为5.00μ_(B),丰富了材料磁性.与Zn掺杂体系相比,Mn、Sn掺杂体系更为稳定.Mn掺杂体系增大了材料带隙,Zn、Sn的掺入使材料带隙分别减小了30.2%和16.2%,有利于电子极化跃迁,但Zn掺入使CsPbI_(3)材料转变为间接带隙半导体.在可见光区域中Mn、Zn、Sn掺杂体均表现出优异的光学性能,Sn掺杂体系效果最佳.这些研究结果为实验方面CsPbI_(3)材料的掺杂改性提供了数据支持,有利于CsPbI_(3)钙钛矿在光电领域的应用.

关键词： CsPbI_(3) 第一性原理电子结构光学性质

Edible agro-products quality and safety in China

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第11期14卷 2166-2175页

作者： LI Zhe-min SU Nian-si dong xiao-xia YANG Yan-tao wang Yu-ting xiao hong-li Agricultural Information Institute Chinese Academy of Agricultural Sciences Key Laboratory of Digital Agricultural Early-Warning Technology Ministry of Agriculture Institute of Agricultural Economics and Development Chinese Academy of Agricultural Sciences Beijing Senior Expert Technology Center Chinese Academy of Sciences

Ensuring an acceptable level of edible agro-products quality and safety is necessary to provide adequate protection for con- sumers. It is the first time that we analyzed the edible agro-products quality and safety issues in the supply chain, including production, processing, circulation, and consumption. The results indicate that the agro-products quality and safety levels improves steadily, and the supervision system and standardization system are both enhanced significantly, however, certain challenges still remain in each stage of the supply chain and the entire supervision process. Finally, five recommendations regarding four aspects （production, processing, circulation, and consumption） are concluded.

关键词： edible agro-products quality and safety food safety supply chain supervision

Anα/βhydrolase family member negatively regulates salt tolerance but promotes flowering through three distinct functions in rice

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2022年第12期15卷 1908-1930页

作者： You-Huang xiang Jia-Jun Yu Ben Liao Jun-xiang Shan wang-Wei Ye Nai-qian dong tao Guo Yi Kan Hai Zhang Yi-Bing Yang Ya-Chao Li Huai-Yu Zhao hong-xiao Yu Zi-qi Lu hong-Xuan Lin National Key Laboratory of Plant Molecular Genetics CAS Centre for Excellence in Molecular Plant Sciences and Collaborative Innovation Center of Genetics&DevelopmentShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China University of the Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China

Ongoing soil salinization drastically threatens crop growth,development,and yield *** is therefore crucial that we improve salt tolerance in rice by exploiting natural genetic ***,many salt-responsive genes confer undesirable phenotypes and therefore cannot be effectively applied to practical agricultural *** this study,we identified a quantitative trait locus for salt tolerance from the African rice species Oryza glaberrima and named it as Salt Tolerance and Heading Date 1(STH1).We found that STH1 regulates fatty acid metabolic homeostasis,probably by catalyzing the hydrolytic degradation of fatty acids,which contributes to salt ***,we demonstrated that STH1 forms a protein complex with D3 and a vital regulatory factor in salt tolerance,OsHAL3,to regulate the protein abundance of OsHAL3 via the 26S proteasome ***,we revealed that STH1 also serves as a co-activator with the floral integrator gene Heading date 1 to balance the expression of the florigen gene Heading date 3a under different circumstances,thus coordinating the regulation of salt tolerance and heading ***,the allele of STH1 associated with enhanced salt tolerance and high yield is found in some African rice accessions but barely in Asian *** of the STH1HP46 allele from African rice into modern rice cultivars is a desirable approach for boosting grain yield under salt ***,our discoveries not only provide conceptual advances on the mechanisms of salt tolerance and synergetic regulation between salt tolerance and flowering time but also offer potential strategies to overcome the challenges resulted from increasingly serious soil salinization that many crops are facing.

关键词： rice salt tolerance flowering time grain yield fatty acid

Microstructural evolution and restoration of creep property for a damaged K403 alloy after rejuvenation heat treatments

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

Rare Metals 2021年第7期40卷 1865-1871页

作者： Liang wang xiao-Guang Yang hong-Yu qi Duo-qi Shi Shao-Lin Li School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191China

Rejuvenation heat treatments can restore the microstructures and mechanical properties of the degraded turbine blades in gas turbine *** we analyze the effects of rejuvenation heat treatments on the microstructural characteristics and mechanical properties of damaged and undamaged specimens of a Ni-based superalloy,*** damaged specimens were found to have degraded microstructures and shorter creep lifetime than the undamaged *** rejuvenation heat treatment proved beneficial,especially for specimens exposed to damage for 50 *** addition,the microstructure recovery and creep life were found to depend on the predamage durations of the specimens.A y’-precipitate-based creep lifetime model was established to predict the residual lifetime based on the microstructural information.

关键词： Microstructural evolution Creep property Restoration Rejuvenation heat treatments

Bimodal microstructure – A feasible strategy for high-strength and ductile metallic materials

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第2期34卷 257-264页

作者： Min Zha hong-Min Zhang Zhi-Yuan Yu Xuan-He Zhang xiang-tao Meng Hui-Yuan wang qi-Chuan Jiang State Key Laboratory of Automotive Simulation and Control Jilin University Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering Nanling Campus Jilin University

Introducing a bimodal grain-size distribution has been demonstrated an efficient strategy for fabricating high-strength and ductile metallic materials, where fine grains provide strength, while coarse grains enable strain hardening and hence decent ductility. Over the last decades, research activities in this area have grown enormously, including interesting results onfcc Cu, Ni and Al-Mg alloys as well as steel and Fe alloys via various thermo-mechanical processing approaches. However, investigations on bimodal Mg and other hcp metals are relatively few. A brief overview of the available approaches based on thermo- mechanical processing technology in producing bimodal microstructure for various metallic materials is given, along with a summary of unusual mechanical properties achievable by bimodality, where focus is placed on the microstructure-mechanical properties and relevant mechanisms. In addition, key factors that influencing bimodal strategies, such as compositions of starting materials and processing parameters, together with the challenges this research area facing, are identified and discussed briefly.

关键词： Nanocrystalline and ultrafine-grained metals Mechanical milling Severe plastic deformation Bimodal microstructure Strength and ductility