检索结果-南通市图书馆

application of improved vacuum degassing technique to refinement of heat resistant steel P91

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2005年第S3期15卷 291-294页

作者：刘江南介万奇 State key laboratory of Solidification Process Northwestern Polytechnical University Xi'an 710072ChinaDepartment of Materials Science and Technology Xi'an Institute of Technology Xi'an 710032 China State key laboratory of Solidification Process Northwestern Polytechnical University Xi'an

An effective vacuum melting technique based on the improved vacuum degassing technique was used to produce thick-walled seamless pipes of 9Cr-1Mo-V-Nb-N martensitic heat resistant steels in order to reduce the contents of harmful impurity such as oxygen, phosphorus. Then the pipe was heat treated by using optimized process technique. Both static and dynamic mechanical properties at room temperature and 566℃ were measured respectively and evaluated by means of comprehensive analysis of standard deviation and statistic test. The results show that the comprehensive mechanical properties of this pipe are much better than those of pipes untreated with the improved vacuum degassing technique and heat-treated by using original heat-treatment process and almost the same as those of imported P91 thick-walled seamless steel pipe.

关键词： vacuum degassing heat treatment mechanical properties standard deviation

Enhanced near-infrared light-induced photoresponse via transition of monocrystalline phase and surface reconstruction

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

Chinese Optics Letters 2023年第5期21卷 75-81页

作者：贾红蒋洪明张瑜萍华淑旭刘青袁玉全胡燕飞彭枫刘小峰 College of Physics and Electronic Information&key laboratory of Electromagnetic Transformation and Detection of henan Province Luoyang Normal UniversityLuoyang 471934China School of Physics and Electronic Engineering Sichuan University of Science&EngineeringZigong 643000China Department of Applied Physics Chengdu University of TechnologyChengdu 610059China School of materials Science and Engineering Zhejiang UniversityHangzhou 310027China

Rare-earth-doped upconversion(UC)materials are ideal candidates for solar photovoltaic conversion and NIR response devices due to their unique spectral conversion properties.However,their low efficiency remains a tremendous challenge for practical applications.Here,we constructed an efficient NIR light-responsive device by coating a Si-photoresistor with a transparent gel consisting of UC powders and an organic polymer matrix.We show that reasonable introduction of alkali metal ions(Na~+,K~+,and Cs~+)into the lattice of UC crystals results in the improvement of photoelectricity conversion efficiency,due to the high crystallinity and surface reconstruction caused by alkali metal ion doping.

关键词： rare-earth-doped upconversion materials solar photoelectric conversion NIR response devices doping with alkali metals

Preparation and investigation of Pd doped Cu catalysts for selective hydrogenation of acetylene

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

Frontiers of Chemical Science and Engineering 2020年第4期14卷 522-533页

作者： Xinxiang Cao Tengteng Lyu Wentao Xie Arash Mirjalili Adelaide Bradicich Ricky Huitema Ben W.-L.Jang Jong K.Keum Karren More Changjun Liu Xiaoliang Yan Department of Chemistry Texas A&M University-CommerceCommerceTX 75429-3011.USA laboratory for Development&application of Cold Plasma technology College of Chemistry and Chemical EngineeringLuoyang Normnal UniversityLuoyang 471022China Collaborative Innovation Center of Chemical Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Center for Nanophase materials Sciences and Chemical Science Division Oak Ridge National LaboratoryOak RidgeTN 37831USA College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024China

A series of PdCu bimetallic catalysts with low Cu and Pd loadings and different Cu:Pd atomic ratios were prepared by conventionally sequential impregnation(CSD)and modified sequential impregnation(MSI)of Cu and Pd for selective hydrogenation of acetylene.Characterization indicates that the supported copper(I)nitrate in the PdCu bimetallic catalysts prepared by MSI can be directly reduced to Cu metal particles due to the hydrogen spillover from Pd to Cu(NO3)2 crystals.In addition,for the catalysts prepared by MSI,Pd atoms can form PdCu alloy on the surface of metal particles,however,for the catalysts prepared by CSI,Pd tends to migrate and exist below the surface layer of Cu.Reaction results indicate that compared with CSI,the MSI method enables samples to possess preferable stability as well as comparable reaction activity.This should be due to the MSI method in favor of the formation of PdCu alloy on the surface of metal particles.Moreover,even Pd loading is super low,<0.045 wt-%in this study,by through adjusting Cu loading to an appropriate value,attractive reactivity and selectivity still can be achieved.

关键词： copper palladium catalysts acetylene selec-tive hydrogenation

Low-temperature sintered(Na_(1/2)Bi_(1/2))TiO_(3)-based incipient piezoceramics for co-fired multilayer actuator application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2019年第3期5卷 480-488页

作者： Pengyuan Fan Yangyang Zhang Shan-Tao Zhang Bing Xie Yiwei Zhu Mohsin Ali Marwat Weigang Ma Kai Liu Liang Shu Haibo Zhang School of materials Science andEngineering State Key Laboratory of Material ProcessingDie&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074China Information Engineering Institute Huanghe Science and Technology CollegeZhengzhou450000China National laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied ScienceCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Research Centre for Functional Ceramics Ministry of EducationHuazhong University of Science and TechnologyWuhan430074China

Low-temperature sintered(Na_(1/2)Bi_(1/2))_(0.935)Ba_(0.065)Ti_(0.975)(Fe_(1/2)Nb_(1/2))_(0.025)O_(3)(NBT-BT-0.025FN)lead-free incipient piezoceramics were investigated using high-purity Li_(2)CO_(3) as sintering aids.With the ≤0.5 wt%Li_(2)CO_(3) addition,the introduced Li^(+) cations precede to enter the A-sites of the perovskite lattice to compensate for the A-site deficiencies.Once the addition exceeds 0.5 wt%,the excess Lit cations will occupy B-sites and give rise to the generation of oxygen vacancies,which accelerate the mass transport and thus lower the sintering temperature effectively from 1100℃ down to 925℃.It was also found that a small amount of Lit addition has little effect on the phase structure and electromechanical properties of the system,but overweight seriously disturbs these characteristics because of the large lattice distortion.The sintered NBT-BT-0.025FN incipient piezoceramics with 1.25 wt%Li_(2)CO_(3) addition at 925℃ provides a large strain of 0.33% and a corresponding large signal piezoelectric coefficient d_(33)^(*) of 550 pm/V at 60 kV/cm,indicating this system is a very promising candidate for lead-free co-fired multilayer actuator application.

关键词： Lead-free piezoceramics (Na_(1/2)Bi_(1/2))TiO_(3) Low-temperature sintering Electric-field-induced strain

Slow-Light planar metamaterial due to bright-bright mode coupling at optical frequencies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Slow-Light planar metamaterial due to bright-bright mode cou...

Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

第十七届全国光散射学术会议

作者： Junqiao Wang Chunzhen Fan Pei Ding Jinna He Xiaomin Liu Erjun Liang School of Physical Science and Engineering and key laboratory of materials Physics of Ministry of Education of China Zhengzhou University Department of Mathematics and Physics Zhengzhou Institute of aeronautical Industry Management

＜正＞Metamaterials with the sharp plasmon resonances have broad practical applications by controlling the line shape of the resonances such as active plasmonic switching,slow-light optical devices,SERS,and sensing.The EIT window usually has sharp spectral profile,which is very powerful for achieving strong dispersion and highly-confined slow light devices with high group index.The controllable slow-light

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

npj Flexible Electronics 2021年第1期5卷 141-149页

作者： Xin He Zhihao Liu Gengzhe Shen Xiang He Jionghong Liang Yu Zhong Tianlong Liang Jie He Yue Xin Chi Zhang Dongdong Ye Guofa Cai School of Applied Physics and materials Wuyi UniversityJiangmenPeople’s Republic of China key laboratory for Special Functional materials of Ministry of Education National&Local Joint Engineering Research Center for High-efficiency Display and Lighting TechnologySchool of Materials and Engineeringand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifengPeople’s Republic of China School of materials and Energy Guangdong University of TechnologyGuangzhouPeople’s Republic of China School of Textile materials and Engineering Wuyi UniversityJiangmenPeople’s Republic of China

In recent years,flexible stress sensors capable of monitoring diverse body movements and physiological signals have been attracting great attention in the fields of healthcare systems,human–machine interfaces,and wearable electronics.Inspired by the structure of natural eggshell inner membrane(ESIM),we developed a pressure sensor based on MXene(Ti_(3)C_(2)T_(x))/Ag NWs(silver nanowires)composite electrodes and the micro-structured dielectric layer to meet the application requirements of wide detection range and long-term stability for the sensors.In the light of the nanoscale-microarray of the dielectric layer and the rough surface of electrode materials,this pressure sensor is expected to allow great and persistent deformation during the loading process.As a result,the device is characterized by an improved sensitivity,fast response(in the millisecond range),wide detection range(0–600 kPa),and long-term stability.The outstanding performance of the proposed sensor makes it possible to detect various human activities,such as speaking,air blowing,clenching,walking,finger/knee/elbow bending,and striking,demonstrating its good application prospects in wearable and flexible electronic devices.

关键词： stability wear Microstructure

Enhanced room-temperature Na^(+) ionic conductivity in Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

eScience 2023年第6期3卷 935-945页

作者： Aikai Yang Kai Yao Mareen Schaller Enkhtsetseg Dashjav Hang Li Shuo Zhao Qiu Zhang Martin Etter Xingchen Shen Huimin Song Qiongqiong Lu Ruijie Ye Igor Moudrakovski Quanquan Pang Sylvio Indris Xingchao Wang Qianli Ma Frank Tietz Jun Chen Olivier Guillon Forschungszentrum Jülich GmbH Institute of Energy and Climate ResearchMaterials Synthesis and Processing(IEK-1)52425 JülichGermany Institute of Mineral Engineering(GHI) RWTH Aachen UniversityForckenbeckstraße 3352074 AachenGermany Institute for Applied materials-Energy Storage Systems(IAM-ESS) Karlsruhe Institute of Technology(KIT)76344 Eggenstein-LeopoldshafenGermany Renewable Energy Conversion and Storage Center(RECAST) Haihe Laboratory of Sustainable Chemical TransformationsKey Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China Deutsches Elektronen-Synchrotron(DESY) Notkestrasse 8522607 HamburgGermany Laboratoire de Cristallographie et Sciences des Materiaux(CRISMAT) CNRSENSICAEN14000 CaenFrance Beijing key laboratory of Theory and technology for Advanced Batteries materials School of Materials Science and EngineeringPeking UniversityBeijing 100871China Institute of materials Henan Academy of SciencesHenan Key Laboratory of Advanced Conductor MaterialsZhengzhou 450046China Max Planck Institute for Solid State Research Heisenbergstraße 170569 StuttgartGermany State key laboratory of Chemistry and Utilization of Carbon Based Energy Resources Key Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryCollege of ChemistryXinjiang UniversityUrumqiXinjiang 830046China Forschungszentrum Jülich GmbH Helmholtz Institute Münster(IEK-12)52425 JülichGermany Jülich Aachen Research Alliance JARA-Energy52425 JülichGermany

Developing cost-effective and reliable solid-state sodium batteries with superior performance is crucial for stationary energy storage.A key component in facilitating their application is a solid-state electrolyte with high conductivity and stability.Herein,we employed aliovalent cation substitution to enhance ionic conductivity while preserving the crystal structure.Optimized substitution of Y^(3+)with Zr^(4+)in Na_(5)YSi_(4)O_(12) introduced Naþion vacancies,resulting in high bulk and total conductivities of up to 6.5 and 3.3 mS cm^(-1),respectively,at room temperature with the composition Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)(NYZS).NYZS shows exceptional electrochemical stability(up to 10 V vs.Naþ/Na),favorable interfacial compatibility with Na,and an excellent critical current density of 2.4 mA cm^(-2).The enhanced conductivity of Naþions in NYZS was elucidated using solid-state nuclear magnetic resonance techniques and theoretical simulations,revealing two migration routes facilitated by the synergistic effect of increased Naþion vacancies and improved chemical environment due to Zr^(4+)substitution.NYZS extends the list of suitable solid-state electrolytes and enables the facile synthesis of stable,low-cost Naþion silicate electrolytes.

关键词： Solid-state electrolytes Sodium superionic conductors Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12) High conductivity Ultra-wide electrochemical window

Precision micro-milling process:state of the art

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2021年第2期9卷 173-205页

作者： Lorcan O’Toole Cheng-Wei Kang Feng-Zhou Fang Center of Micro/Nano Manufacturing technology(MNMT-Dublin) University College DublinDublin 4Ireland State key laboratory of Precision Measuring technology and Instruments Center of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China

Micro-milling is a precision manufacturing process with broad applications across the biomedical,electronics,aerospace,and aeronautical industries owing to its versatility,capability,economy,and efficiency in a wide range of materials.In particular,the micro-milling process is highly suitable for very precise and accurate machining of mold prototypes with high aspect ratios in the microdomain,as well as for rapid micro-texturing and micro-patterning,which will have great importance in the near future in bio-implant manufacturing.This is particularly true for machining of typical difficult-to-machine materials commonly found in both the mold and orthopedic implant industries.However,inherent physical process constraints of machining arise as macromilling is scaled down to the microdomain.This leads to some physical phenomena during micromilling such as chip formation,size effect,and process instabilities.These dynamic physical process phenomena are introduced and discussed in detail.It is important to remember that these phenomena have multifactor effects during micro-milling,which must be taken into consideration to maximize the performance of the process.The most recent research on the micro-milling process inputs is discussed in detail from a process output perspective to determine how the process as a whole can be improved.Additionally,newly developed processes that combine conventional micro-milling with other technologies,which have great prospects in reducing the issues related to the physical process phenomena,are also introduced.Finally,the major applications of this versatile precision machining process are discussed with important insights into how the application range may be further broadened.

关键词： Precision machining Micro-milling Size effect Deflection Runout Tool wear

Experimental and numerical investigation into the non-explosive excavation of tunnels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1885-1900页

作者： Quan Zhang Zhigang Tao Chun Yang Shan Guo Manchao He Chongyuan Zhang Huiya Niu Chao Wang Shen Wang School of Mines China University of Mining and TechnologyXuzhouJiangsu221116China State key laboratory of Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China School of Resources and Safety Engineering Central South UniversityChangsha410083China Department of Mining and materials Engineering McGill UniversityMontrealQCH3A 0E8Canada Institute of Geomechanics Chinese Academy of Geological SciencesBeijing100081China College of Environmental Science and Engineering Ocean University of ChinaQingdao266100China School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo454003China

The use of explosives is restricted on some important holidays,and the handling of unexploded charge is very dangerous.Therefore,an innovative non-explosive technology called instantaneous expansion(IE)was developed for tunneling.IE,whose components are derived from solid wastes such as coal gangue and straw conduces to realizing the reuse of waste.Moreover,its cost is lower than explosives.Blind guns of IE are easy to treat with water.The IE tunneling method is classified into two categories,i.e.IE with a single fracture(IESF)and IE with multiple fractures(IEMF),which are used to form the tunnel crosssection directionally cross-section and to fragment the rocks inside the cross-section,respectively.In this study,the principle of IE tunneling was elaborated first.Then,tunneling experiments and numerical simulations were performed on IE,conventional blasting(CB)and shaped charge blasting(SCB)in comparison.The experimental and numerical results show that IE achieved the best performance of directional rock breaking and corresponded to the most minor excavation-induced damage zone of the surrounding rock.Besides,the tunnel cross-section created by IE was flat and smooth.Comparing IE with CB and SCB,the over/under-excavation area decreased by 64%and 17%,and the excavation-induced damage zone fell by 26%and 11%,respectively.The range of the loose circle is reduced,which is conducive to improving the long-term stability of the roadway.The research provides a safe and economical tunneling method with excellent application prospects.

关键词： Instantaneous expansion(IE) Non-explosive Tunneling Smooth tunnel cross-section Excavation-induced damage zone