检索结果-南通市图书馆

Journal of Materials Science & Technology 2022年第35期130卷 136-156页

作者： long xia Yuming Feng Biao Zhao School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209China School of Microelectronics Fudan UniversityShanghai 200433China

Electromagnetic absorbers(EMA) have driven the development of Electromagnetic(EM) technology and advanced EM devices. Utilizing the EM energy conversion of EM absorbers to design various devices is attractive and promising, especially in personal protection and healthcare. In this review article, the simulation and numerical analysis of EM materials are reviewed, from numerical analysis of dielectric parameters, simulation of wave absorbing performance, electromagnetic performance improvement, and structural construction optimization. For the EM response mechanism, radiation-dependent relaxation and charge transport energy transitions are dissected. For the EM calculation section, two leading roles are highlighted, including the purposeful design of EM and the provision of theoretical guidance for optimizing electromagnetic absorption performance. In addition, this work points out the current problems and potential opportunities in the numerical simulation of absorbing materials, points out the new development direction, and proposes prospects.

关键词： Microwave absorption Multiphysics simulation Dielectric parameters EMA Properties optimization

Influence of the Electrical Vehicle Charging on the Grid Harmonic

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2017年第1期15卷 99-105页

作者： Cheng-long xia Yong-Duan Song Yang Luo School of Energy Science and Engineering University of Electronic Science and TechnologyChengdu 611731China

This paper described the impact of the electrical vehicle（EV） charging on the grid harmonic. In view of the randomness of the EV charging process, the harmonic admittance matrix method and superposition method were used to build the single and multiple EVs charging simulation model. By using Matlab as a simulation tool, we analyzed harmonic currents of single and multiple EVs chargers. The results show that the harmonic ratio is beyond the scope of the national harmonic standard. Finally a parallel hybrid active filter（PHAPF） was introduced for governance of *** experimental results show that net side harmonic currents are significantly reduced by using the PHAPF and meet the national standard GB/Z17625.6-2003 regulations limit.

关键词： harmonic superposition charging currents governance regulations battery impedance rectifier beyond

Geologic-seismic models,prediction of shallow-water lacustrine delta sandbody and hydrocarbon potential in the Late Miocene,Huanghekou Sag,Bohai Bay Basin,northern China

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2018年第1期7卷 66-87页

作者： Hao Liu Qing-long xia Xin-Huai Zhou School of Ocean Sciences China University of Geosciences Exploration & Exploitation Research Institute Tianjin Branch of China National Offshore Oil Corporation Exploration & Exploitation Research Institute Shanghai Branch of China National Offshore Oil Corporation

The Huanghekou Sag is located at the southeast part of the Bohai Bay Basin, northern China. Large-scale shallow lake delta developed in the Neogene provided suitable geological conditions for the formation of a subtle oil-gas reservoir in this area. The key for analyzing sandstone reservoir and sedimentary facies is by using seismic attributes(amplitude) to establish the relationship between lithology combination and seismic attributes. The lower unit of Late Miocene Minghuazhen Formation at the BZ34 block in the Huanghekou Sag was subdivided into 10 parasequence sets(PSS). Thicker sandstones mainly occurred in PSS1 and PSS10, whereas thin sandstones are mostly observed within other parasequence sets. This study presents statistics and analyses of lithology, i.e., statistics of root-meansquare(RMS) amplitude and lithology of well locations in different parasequence sets of the study area,as well as 1-D forward seismic models of 7 types of lithology combinations, the establishment of a spatial distribution of 2-D sandbody, forward seismic models etc. Our study indicates that high amplitude peaks correspond to thicker sandbodies, while low amplitude indicates non-development of sandbodies(generally less than 2 m), and medium amplitude agrees well with large sets of mudstones interbedded with medium and thinner sandstones. Different sand-mudstone combinations genetically reflect a combination of multiple micro-facies, therefore, amplitude features can predict sandbodies as well as facies characteristics.

关键词： Shallow-water lacustrine delta High-frequency sequence Root-mean-square(RMS)amplitude Geological-geophysical model Sandstone depiction Huanghekou Sag Late Miocene

Vertical dynamic response of the ballastless track on long-span plate-truss cable-stayed bridges

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第2期58卷 236-247页

作者： LI Yong Le SU Yang xia Fei long ZHANG Nan Department of Bridge Engineering Southwest Jiaotong University MOE Key Laboratory of High Speed Railway Engineering Southwest Jiaotong University Department of Bridge Engineering Northern Jiaotong University

An analytical model is presented to study vertical dynamic response of the ballastless track on long-span plate-truss cable-stayed bridges based on an explicit dynamic analysis *** the model,the train,ballastless track and bridge are treated as a coupled vibration system with *** simulating the dynamic process of the system,this paper discusses the distribution law of dynamic responses of the bridge deck and the bed *** shows the necessity of a base plate for the ballastless track on the long-span plate-truss cable-stayed *** of the influence of different train speeds and stiffness of the elastic vibration-damping pad on the dynamic responses of the bridge deck and the bed slab is also *** reasonable stiffness value of elastic vibration-damping pad is proposed.

关键词： long-span cable-stayed bridge plate-truss girder ballastless track train-induced vibration vehicle-bridge system

Joints of continuous carbon fiber reinforced lithium aluminosilicate glass ceramics matrix composites to Ti60 alloy brazed using Ti-Zr-Ni-Cu active alloy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2019年第3期32卷 715-722页

作者： Shengpeng HU Dongdong FENG long xia Ke WANG Renwei LIU Zhentao xia Hongwei NIU xiaoguo SONG School of Materials Science and Engineering Harbin Institute of Technology Shanghai Institute of Spacecraft Equipment

Continuous carbon fiber reinforced lithium aluminosilicate glass ceramics matrix composites(C_f/LAS composites) are joined to Ti60 alloy vacuum brazed using Ti-Zr-Ni-Cu brazing alloy. The effects of the brazing temperature on the interfacial microstructure and mechanical properties of brazed joints are investigated in details. The interfacial microstructure varies apparently with an increase of the brazing temperature. The thicknesses of the banded Ti solid solution(Ti(s, s)) and the reactive layer between Cf/LAS composites and the interlayer grow gradually. The mechanical properties of brazed joints increase firstly and then decrease with an increasing temperature. In addition, a joint that is brazed at 980 °C for 10 min shows the highest shear strength of$38.13 MPa. At the same time, the fracture paths of brazed joints also change as the temperature increases. When the brazing temperature is 950 °C, the fracture position is in the TiC + ZrC +Ti_2O + ZrSi_2+ Ti_5Si_3 layer on the composite side. When the brazing temperature is 980 °C, the fracture position is on the side of the braze seam(Ti, Zr)2(Ni, Cu), Ti_2O + ZrSi_2+ Ti_5Si_3 layer,and carbon fiber in the composite material. When the brazing temperature is 990 °C, the fracture position is in the Ti_2O + ZrSi_2+ Ti_5Si_3 layer on the composite side and the carbon fiber in the composite material.

关键词： Brazing Composites Mechanical properties Microstructure Titanium alloys

Synthesis and photocatalytic properties of core–shell TiO^2@ZnIn_2S_4 photocatalyst

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第11期24卷 984-986页

作者： Wen-Hui Yuan Zi-long xia Li Li School of Chemistry and Chemical Engineering South China University of Technology School of Environmental Science and Engineering South China University of Technology

A novel core–shell TiO2@ZnIn2S4composite has been synthesized successfully by a simple and flexible hydrothermal route using TiO2as *** as-synthesized samples were characterized by X-ray diffraction,UV–vis diffuse reflectance spectra and transmission electron *** photocatalytic properties of samples were tested by degradation of aqueous methylene blue（MB）under visible light *** was found that the as-synthesized TiO2@ZnIn2S4photocatalyst was more effcient than TiO2and ZnIn2S4in the photocatalytic degradation of ***,TEM images confrmed the TiO2@ZnIn2S4nanoparticles possessed a well-proportioned core–shell morphology.

关键词： Core–shell TiO_2 ZnIn_2S_4 Photocatalytic

A porous Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) light color adjustable phosphor:Luminescent property and application of warm white LED

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第8期42卷 1421-1428,I0001页

作者： Yunxiao Ma Chao Linghu Ming Yang Hui Yu xiangting Dong long xia School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun130022China School of Materials Science and Engineering Harbin Institute of Technology(Weihai)Weihai264209China

Light emitting diode(LED) is the fourth generation lighting source,but it has some shortcomings such as complex chip packaging process and the unbalanced light color of phosphor in long-time *** this study,a kind of Eu-terephthalic acid/Tb-sulfosalicylate/ZrO_(2)/ZnZrO_(3)(Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3))phosphor with warm white light emission properties was prepared,and the warm white light LED(wWLEDs) was successfully prepared by encapsulating Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) phosphors together with 270 nm *** ZrO_(2)/ZnZrO_(3),Tb-SSA/ZrO_(2)/ZnZrO_(3) and Eu-PTA/ZrO_(2)/ZnZrO_(3) samples show blue emission,green emission and red emission under deep ultraviolet(UV,270 nm) excitation,*** Tb-SSA and Eu-PTA are co-doped into ZrO_(2)/ZnZrO_(3) matrix with blue emission to achieve the warm white light emission,and the light color can be adjusted by controlling the doping amount of Eu^(3+)-and Tb^(3+).Through the excitation method of single-component phosphor by the single chip,the complex chip packaging process of w-LED can be *** doping rare earth organic complexes into porous ZrO_(2)/ZnZrO_(3) matrix,the problems of the light color unbalanced of phosphor and the low luminescence intensity of rare earth doped metal oxides composites can be solved.

关键词： Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) Luminescence material Light color adjustable phosphor Warm white emission W-WLEDs Rare earths

Cl-terminated decoration to modulate the permittivity of MXene for enhanced electromagnetic-absorbing performance

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第12期179卷 187-197页

作者： Yunfei He Dongdong Liu Qiang Su Bo Zhong long xia xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264009China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China

The explosive growth of communication technology has given rise to a large number of high-quality electromagnetic wave(EMW)absorbing materials,and single-component materials are often difficult to satisfy the *** this study,we propose an etching method of molten chlorine salts under vac-uum to prepare Cl-terminated MXene(MX-Cl)which can meet the requirements of"thin,light,wide and strong"and realize the application of single-component absorbing *** the X and Ku bands,MX-Cl achieves a strong reflection loss of-42.99 dB and an effective absorption bandwidth of 3.44 GHz with the 1.2 mm matching *** presence of Cl groups restricts the free electron movement of surface-Ti,which controls the conductivity of the MX-Cl and optimizes its *** polarization induced by Ti-Cl,interfacial polarization between MXene layers and multiple scattering effects inside the layers all significantly increase the dielectric loss of the MX-Cl *** study provides a new approach to investigating the effect of single atoms on the dielectric properties of *** work also offers a simple and low-cost process for the preparation of single-component MXene EMW-absorbing materials.

关键词： Cl-terminated MXene Conductivity mechanism Multi-polarization effect Electromagnetic wave absorption

Power Optimization Strategy Considering Electric Vehicle in Home Energy Management System

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

Journal of Electronic Science and Technology 2016年第3期14卷 234-241页

作者： Yu-xiao Huang Feng Yang Yang Luo Cheng-long xia the School of Energy Science and Engineering University of Electronic Science and TechnologyChengdu 611731China the School of Automation Engineering University of Electronic Science and TechnologyChengdu 611731China

With the development of smart grid, residents have the opportunity to schedule their household appliances （HA） for the purpose of reducing electricity expenses and alleviating the pressure of the smart grid. In this paper, we introduce the structure of home energy management system （EMS） and then propose a power optimization strategy based on household load model and electric vehicle （EV） model for home power usage. In this strategy, the electric vehicles are charged when the price is low, and otherwise, are discharged. By adopting this combined system model under the time-of-use electricity price （TOUP）, the proposed scheduling strategy would effectively minimize the electricity cost and reduce the pressure of the smart grid at the same time. Finally, simulation experiments are carried out to show the feasibility of the proposed strategy. The results show that crossover genetic particle swarm optimization algorithm has better convergence properties than traditional particle swarm algorithm and better adaptability than genetic algorithm.

关键词： EMS smart grid scheduling space state of charge time-of-use electricity price vehicle-to-grid technology (V2G) technology.

Carbonized wood with ordered channels decorated by NiCo_(2)O_(4) for lightweight and high-performance microwave absorber

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第1期11卷 105-119页

作者： Guangyu QIN xiaoxiao HUANG Xu YAN Yunfei HE Yuhao LIU long xia Bo ZHONG School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Radio Measurement Beijing 100854China School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264009China

Wood-derived carbon has a 3D porous framework composed of through channels along the growth direction,which is a suitable matrix for preparing electromagnetic wave(EMW)absorbing materials with low cost,light weight,and environmental ***,the carbonized wood decorated by short cone-like NiCo_(2)O_(4)(NiCo_(2)O_(4)@CW)with highly ordered straight-channel architecture was successfully manufactured through a facile calcination *** horizontal arrangement of the through channels of NiCo_(2)O_(4)@CW(H-NiCo_(2)O_(4)@CW)exhibits a strong reflection loss value of-64.0 dB at 10.72 GHz with a thickness of 3.62 mm and a low filling ratio of 26 wt%(with the density of 0.98 g-cnf3),and the effective absorption bandwidth(EAB)is 8.08 GHz(9.92-18.0 GHz)at the thickness of 3.2 *** excellent microwave absorption(MA)property was ascribed to the ordered-channel structure with abundant interfaces and defects from NiCo_(2)O_(4)@CW,which could promote the interfacial polarization and dipole *** is more,this advantageous structure increased the multiple reflections and *** element analysis(FEA)simulation is carried out to detect the interaction between the prepared material and EMW when the ordered channels are arranged in different *** research provides a low-cost,sustainable,and environmentally friendly strategy for using carbonized wood to fabricate microwave absorbers with strong attenuation capabilities and light weight.

关键词： microwave absorption(MA) wood-derived carbon ordered-channel architecture light weight finite element analysis(FEA)