检索结果-南通市图书馆

Deformation Behaviors of an Additive-Manufactured Ni_(32)Co_(30)Cr_(10)Fe_(10)Al_(18)Eutectic High Entropy Alloy at Ambient and Elevated Temperatures

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1607-1616页

作者： Zishu Chai Kexuan Zhou Qingfeng Wu Zhijun Wang Quan Xu Junjie Li Jincheng Wang State key laboratory of Solidification processing School of MaterialsNorthwestern Polytechnical UniversityXi’an710072China Shanghai Electro Mechanical Engineering Institute Shanghai201600China

Eutectic high-entropy alloys(EHEAs)that have superior formability are attractive for direct laser deposition *** this study,a regular-shaped bulk Ni_(32)Co_(30)Cr_(10)Fe_(10)Al_(18)EHEA without apparent pores and micro-cracks was successfully fabricated by direct laser *** as-deposited alloy showed a high tensile strength of 1.3 GPa with a ductility of 35%at ambient temperature and a tensile strength of 320 MPa at 760℃.The deformation mechanisms of the as-deposited alloy at ambient and elevated temperatures were investigated by coupling the in-situ tensile test with a scanning electron *** is revealed that the excellent combination of strength and ductility originated from the synergic effects of the FCC and B2 phases in eutectic *** the generation of cracks along phase boundaries restricted its high-temperature strength above 760℃.

关键词： Direct laser deposition Eutectic high-entropy alloys Elevated-temperature properties Deformation behaviors

MLXR: multi-layer obstacle-avoiding X-architecture Steiner tree construction for VLSI routing

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第1期60卷 211-213页

作者： Xing HUANG Wenzhong GUO Genggeng LIU Guolong CHEN College of Mathematics and Computer Sciences Fuzhou University key laboratory of Network Computing and Intelligent Information processing (Fujian Province) Fuzhou University

Dear editor,Rectilinear Steiner minimal tree(RSMT)has been widely used in several modern very large scale integration(VLSI)circuit design *** of its importance,it has been fully studied in the past *** addition,the density of modern VLSI chips has increased *** today’s VLSI designs,there are increasingly more obstacles,such as IP blocks and pre-routed nets,these

关键词： VLSI MLXR multi-layer obstacle-avoiding X-architecture Steiner tree construction for VLSI routing tree

Reconstruction algorithm of super-resolution infrared image based on human vision processing mechanism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2015年第2期8卷 195-202页

作者： Shaosheng DAI Zhihui DU Haiyan XIANG Jinsong LIU Chongqing key laboratory of Signal and Information processing Chongqing University of Posts and Telecommunications Chongqing 400065 China

Aiming at solving the problem of low resolu- tion and visual blur in infrared imaging, a super-resolution infrared image reconstruction method using human vision processing mechanism （HVPM） was proposed. This method combined a mechanism of vision lateral inhibition with an algorithm projection onto convex sets （POCS） reconstruction, the improved vision lateral inhibition network was utilized to enhance the contrast between object and background of low-resolution image sequences, then POCS algorithm was adopted to reconstruct super- resolution image. Experimental results showed that the proposed method can significantly improve the visual effect of image, whose contrast and information entropy of reconstructed infrared images were improved by approxi- mately 5 times and 1.6 times compared with traditional POCS reconstruction algorithm, respectively.

关键词： human vision processing mechanism(HVPM) projection onto convex sets (POCS) super-resolution infrared image reconstruction algorithm

Interpolation Fitting Algorithm in Time-Space Domain of Differential Barometric Altimetry

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2019年第1期28卷 119-128页

作者： Zhengqun Hu Lirong Zhang Guanyi Ma Yuanfa Ji National Astronomical Observatories Chinese Academy of Sciences key laboratory of Cognitive Radio and Information processing Ministry of EducationGuilin University of Electronic Technology Guangxi key laboratory of Precision Navigation Technology and Application

In order to overcome the limitations of a unitary reference station in mobile communication positioning network differential barometric altimetry(DBA)and broaden the action scope of the reference station and improve positioning accuracy of elevation,an integrated interpolation algorithm model based on generalized extended approximation(GEA)algorithm and Kriging interpolation in time-space domain of reference station is *** the time domain,barometric measured data is considered the maximum value estimated by bilateral extension to avoid wrong direction of estimation,which is approaching true *** the spatial domain,barometric relevance among multiple reference stations is utilized,the weighted coefficients of multiple reference stations is calculated by the integrated algorithm model based on the GEA algorithm and Kriging *** impact of each reference station to the measured station is quantified,so that a virtual reference station is constructed,which can overcome the limitation of barometric correction by a unitary reference *** addition,the measurement error due to irregular change in atmospheric pressure will be eliminated.

关键词： differential barometric altimetry(DBA) multi reference station generalized extended approximation(GEA) Kriging algorithm

Dynamically adjustable asymmetric transmission and polarization conversion for linearly polarized terahertz wave

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第2期29卷 288-293页

作者： Tong Li Fang-Rong Hu Yi-Xian Qian Jing Xiao Long-Hui Zhang Wen-Tao Zhang Jia-Guang Han Guangxi key laboratory of Optoelectronic Information processing Guilin University of Electronic TechnologyGuilin 541004China key laboratory of Optical Information Detecting and Display Technology Zhejiang Normal UniversityJinhua 321004China Air Force Logistics College Xuzhou 221000China

The asymmetric transmission(AT) and polarization conversion of terahertz(THz) wave play a vital role in future THz communication,spectrum,and information ***,it is very difficult and complicated to actively control the AT of electromagnetic(EM) wave by using traditional ***,we theoretically demonstrate a stereo-metamaterial(stereo-MM) consisting of a layer of metal structure and a layer of phase transition structure with a polyimide spacer in *** performance of the device is simulated by using the finite-integration-technology(FIT).The results show that the AT and polarization conversion of linearly polarized wave can be dynamically controlled in a range of 1.0 THz-1.6 THz when the conductivity c,F of vanadium dioxide(VO2) is changed under the external *** study provides an example of actively controlling of the AT and polarization conversion of the EM wave.

关键词： stereo-metamaterial(stereo-MM) asymmetric transmission(AT) polarization conversion vanadium dioxide(VO2)

Self-Assembled Monolayer of Mixed Gold and Nickel Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2012年第3期4卷 166-171页

作者： Yanni Jie Huiqing Fan Wei You State key laboratory of Solidification processing School of Materials ScienceNorthwestern Polytechnical University Department of Chemistry University of North Carolina at Chapel Hill

Forming a monolayer of mixed nickel and gold nanoparticles through self-assembly via simple solution processing constitutes an important step toward inexpensive nanoparticle-based carbon nanofiber *** this work,mixed gold and nickel nanoparticles were anchored on the silicon wafer using self-assembled monolayers(SAMs)as a *** of 3-mercaptopropyl trimethoxysilane(MPTS-SAMs)were formed on silicon wafer,with the exposed thiol functionality providing ligand exchange sites to form the mixed monolayer of nickel and gold nanoparticles via a two-step sequential soaking *** densities of the nickel and gold nanoparticles on the surface can be varied by adjusting the soaking sequence.

关键词： Nanoparticles Self-assembled monolayer 3-mercaptopropyl trimethoxysilane Solution processing

Hot deformation behavior and constitutive relationship of Q420qE steel

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第1期18卷 36-41页

作者：禹宝军关小军王丽君赵健刘千千曹宇 key laboratory for Liquid-Solid Structural Evolution and processing of Materials(Ministry of Education) Shandong University School of Materials Science and Engineering Shandong University

Isothermal compression tests at temperatures from 1 273 to l 423 K and strain rates from 0.1 to 10 s-q were carried out to investigate the flow behaviors of Q420qE steel. Stress-strain data collected from the tests were employed to establish the constitutive equation, in which the influence of strain was incorporated by considering the effect of strain on material constants Q, n, a, and lnA. The results show that the flow stress curves are dependent on the strain, strain rate and deformation temperature. They display typical dynamic recrystallization behavior and consist of three stages, i.e., hardening stage, softening stage and steady stage. The flow stress decreases with increasing the deformation temperature and decreasing the strain rate. In addition, the flow stress data predicted by the proposed constitutive model agree well with the corresponding experimental results, and the correlation coefficient and the average absolute relative error between them are 0.990 3 and 3.686%, respectively.

关键词： Q420qE bridge steel hot compression flow stress strain dependent constitutive equation

Effects of concurrent grain boundary and surface segregation on the final stage of sintering: the case of Lanthanum doped yttriastabilized zirconia

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第3期33卷 251-260页

作者： M.M.Gong S.Dey L.J.Wu C.H.Chang H.Li R.H.R.Castro F.Liu State key laboratory of Solidification processing Northwestern Polytechnical University Xi＇an 710072 China Department of Materials Science ＆ Engineering University of California Davis CA 95616 USA

Dopants play a critical role in tailoring the microstructure during sintering of compacts. These dopants may form solid solution within the bulk, and/or segregate to the grain boundaries（GBs） and the solidvapor interfaces（free surfaces）, each causing a distinct energetic scenario governing mass transports during densification and grain growth. In this work, the forces controlling the dopant distribution, in particular the possibility of concurrent segregation at both surfaces and GBs, are discussed based on the respective enthalpy of segregation. An equation is derived based on the minimum Gibbs energy of the system to determine enthalpy of segregation from experimental interface energy data, and the results applied to depict the role of La as a dopant on the interface energetics of yttria stabilized zirconia during its final stage of sintering. It is shown that La substantially decreases both GB and surface energies（differently）as sintering progresses, dynamically affecting its driving forces, and consequent grain growth and densification in this stage.

关键词： Grain boundary(GB) segregation Surface segregation Enthalpy of segregation GB energy Surface energy

Uniform Metal Sulfide@N-doped Carbon Nanospheres for Sodium storage: Universal Synthesis Strategy and Superior Performance

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2023年第2期6卷 389-396页

作者： Kai Yang Hao Fu Yixue Duan Manxiang Wang Minh Xuan Tran Joong Kee Lee Woochul Yang Guicheng Liu Department of Physics Dongguk UniversitySeoul 04620Korea Shaanxi key laboratory of Chemical Additives for Industry Shaanxi University of Science and TechnologyXi’an 710021China State key laboratory of Advanced Technology for Materials Synthesis and processing Wuhan University of TechnologyWuhan 430070China College of Physics and Electronic Information Yan’an UniversityYan’an 716000China Center for Energy storage Research Clean Energy InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Korea

Nitrogen-doped carbon-coated transition-metal sulfides(TMS@NCs)have been considered as efficient anodes for sodium-ion ***,the uncontrollable morphology and weak core-shell binding forces significantly limit the sodium storage performance and ***,based on the reversible ring-opening reaction of the epoxy group of the tertiary amino group-rich epoxide cationic polyacrylamide(ECP)at the beginning of hydrothermal process(acidic environment)and the irreversible ring-opening(cross-linking reactions)at the late hydrothermal period(alkaline environment),47 nm-sized ZnS@NCs were prepared via a one-pot hydrothermal *** this process,the covalent bonds formed between the ZnS core and elastic carbon shell significantly improved the mechanical and chemical stabilities of ZnS@*** from the nanosize,fast ion/electron transfer,and high stability,ZnS@NC exhibited a high reversible capacity of 421.9 mAh g^(−1) at a current density of 0.1 A g^(−1) after 1000 cycles and a superior rate capability of 273.8 mAh g^(−1) at a current density of 5 A g^(−1).Moreover,via this universal synthesis strategy,a series of TMS@NCs,such as MoS_(2)@NC,NiS@NC,and CuS@NC were developed with excellent capacity and cyclability.

关键词： anode materials core-shell structure nitrogen-doped carbon ring-opening reaction transition-metal sulfide