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improved performance of GaN-based light-emitting diodes by using short-period superlattice structures

Progress in Natural Science:Materials international 2010年第1期20卷 70-75页

作者： Yi-jung LiU~1,Chien-chang HUANG~1,Tai-you CHEN~1,Chi-shiang HSU~1,Shiou-ying CHENG~2, Kun-wei LiN~3,Jian-kai LiOU~1,Wen-chau LiU~1 1.institute of Microelectronics,department of Electrical engineering,national Cheng-Kung university, Tainan 70101,taiwan,china 2.department of electronic engineering,nation ilan university,i-lan 26041,taiwan,china 3.department and Graduate institute of Computer Science and information engineering, Chaoyang university of Technology,Taichung 41349,taiwan,china [a] institute of Microelectronics Department of Electrical Engineering National Cheng-Kung University Tainan 70101 Taiwan China [b] department of electronic engineering Nation Ilan University I-Lan 26041 Taiwan China [c] department and Graduate institute of Computer Science and information engineering Chaoyang University of Technology Taichung 41349 Taiwan China

An inGaN/GaN multiple-quantum-well（MQW）light-emitting diode（LED）with a ten-period i（undoped）-inGaN/p（Mg doped）-GaN（2.5 nm/5.0 nm）superlattice（SL）structure,was *** SL structure that can be regarded as a confinement layer of holes to enhance the hole injection efficiency is inserted between MQW and p-GaN *** studied LED device exhibits better current spreading performance and an improved quality,compared with a conventional one without SL *** to the reduced contact resistance as well as more uniformity of carriers injection,the operation voltage at 20 mA is decreased from 3.32 to 3.14 V.A remarkably reduced reverse-biased leakage current(10-7-10-9A)and higher endurance of the reverse current pulse are *** measured output power and external quantum efficiency（EQE）of the studied LED are 13.6 mW and 24.8%,respectively. in addition,significant enhancement of 25.4%in output power as well as increment of 5%in EQE for the studied devices is observed, as the studied devices show superior current spreading ability and reduction in dislocations offered by the SL structure.

关键词： GaN superlattice(SL) current spreading hole confinement electrostatic discharge(ESD)

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Properties of Concrete incorporating Bed Ash from Circulating Fluidized Bed Combustion and Ground Granulates Blast-furnace Slag

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Journal of Wuhan university of Technology(Materials Science) 2011年第2期26卷 348-354页

作者：鄭安 department of Civil engineering National Ilan UniversityIlan 26046TaiwanChina

The properties of concrete incorporating circulating fluidized bed combustion （CFBC） bed ash and ground granulates blast-furnace slag （GGBS） were *** strength,drying shrinkage,mercury intrusion porosimetry （MiP）,scanning electronic microscopy （SEM）,and X-ray diffraction （XRD） of concrete samples containing CFBC bed ash and GGBS were *** work used initial surface absorption test （iSAT） and rapid chloride penetration test （RCPT） on concrete to measure the absorption and the ability of concrete to resist chloride ion characteristics for different concrete samples containing CFBC bed ash and *** circuit potential （OCP）,direct current polarization resistance were obtained to evaluate rebar *** CFBC bed ash was X-ray amorphous and consist of SiO2,Al2O3 and CaO *** the replacement of CFBC for sand increases,the rate of initial surface absorption （iSA） increases but compressive strength *** the content of CFBC bed ash replacement for sand maintains constant,the replacement of GGBS for cement increases,compressive strength increases but the rate of iSA *** and corrosion resistance of rebar significantly improve by utilizing a proper amount of CFBC bed ash and GGBS in concrete.

关键词： corrosion absorption chloride circulating fluidized bed combustion GGBS

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A direct electrochemical biosensor for rapid glucose detection based on nitrogen-doped carbon nanocages

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Rare Metals 2024年第5期43卷 2184-2192页

作者： lan-lan Li Yu Zhao Li-Jia Pan Jian-Bin Xu Yi Shi College of Mechanical and Electrical engineering Henan Agricultural UniversityZhengzhou 450002China School of electronic Science and engineering Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China department of electronic engineering The Chinese University of HongKongHongkong 999077China

Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is *** study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron *** surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.

关键词： Direct electron transfer(DET) Nitrogen-doped carbon nanocages(NCNCs) Glucose oxidase Biosensor

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Simulations on Various Lubrication Boundaries between Diamond-like Carbon Films

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Journal of Wuhan university of Technology(Materials Science) 2011年第4期26卷 658-660页

作者：兰惠清 School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

Molecular dynamics （MD） simulations were used to study a sliding friction process between DLC films on various boundary conditions. The experimental results revealed that, in the absence of a lubricant, a transfer film between the DLC films was formed. in contrast, when the oil or water lubricants were added to lubricate between the DLC films, a boundary lubrication layer was found. The friction forces on the water and oil lubrication were almost the same, but the friction force in the absence of a lubricant was larger than those on the water and oil lubrication. The conclusions were in good agreement with the experiments.

关键词： lubrication carbon molecular dynamics

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Chaotic Synchronization with Filter Based onWavelet Transformation

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Communications in Nonlinear Science and Numerical Simulation 1999年第4期4卷 3-5页

作者： Xiaoan ZHOU Junfeng lan Shuisheng QiU(Deplartmeat of electronic engineering, South china university of Technology, Guangzhou510640, china) department of electronic engineering South China University of Technology Guangzhou 510640 China

introductioninreceatyears,synchronizationofchaoticsystemsanditspotelltialapplicationtocommunicationshavebecomeareaofactiveresearch[1--5],becauseofthebroadbandpropediesofchaoticsignal,itsshazprelativityandsensitiveness... 详细信息

关键词： colpitts oscillator chaotic synchronization wavelet transformation

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High-entropy design boosts dielectric energy storage

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Rare Metals 2024年第8期43卷 4013-4015页

作者： Qiu-Ying Xia He Zhu Si lan Yang Ren Herbert Gleiter institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China department of Physics City University of Hong KongHong Kong999077China

Dielectric capacitors are vital for advanced electronic and electrical power systems due to their impressive power density and ***,a persistent challenge has been enhancing their energy densities while maintaining high *** in Science,a novel high-entropy design for relaxor ferroelectric materials has been proposed,promising significant improvements in both energy density and efficiency for multilayer dielectric ceramic *** the crucial role of high-entropy design in energy storage materials and devices,this highlight focuses on interpreting the progress and significance of this innovative work.

关键词： ceramic dielectric energy

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Wigner function of optical cumulant operator and its dissipation in thermo-entangled state representation

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Chinese Physics B 2024年第6期33卷 205-210页

作者：张科李兰兰范洪义 School of electronic engineering Huainan Normal UniversityHuainan 232038China department of Material Science and engineering University of Science and Technology of ChinaHefei 230026China

To conveniently calculate the Wigner function of the optical cumulant operator and its dissipation evolution in a thermal environment, in this paper, the thermo-entangled state representation is introduced to derive the general evolution formula of the Wigner function, and its relation to Weyl correspondence is also discussed. The method of integration within the ordered product of operators is essential to our discussion.

关键词： Wigner function optical cumulant operator dissipation evolution thermo-entangled state representation integration within ordered product of operators

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Electromagnetic wave absorption performance and rheological behavior of rubber composites with low mass filling rate carbon nanofiber aerogel

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Journal of Materiomics 2024年第4期10卷 928-936页

作者： Zhiyi Zhang Bicheng Zhou lan Jia Wenwen Yu Qiang Zheng College of Materials Science and engineering Taiyuan University of TechnologyTaiyuan030024China Shanxi-Zheda institute of Advanced Materials and Chemical engineering Taiyuan030000China rd Research institute of china electronics Technology Group Corporation Taiyuan030032China department of Polymer Science&engineering Zhejiang UniversityHangzhou310027China

With the development of electronic information science and technology,electromagnetic information security and electromagnetic pollution become more and more *** wave absorption(EMWA)rubber based on the absorbent of carbon with low density and good corrosion resistance is a kind of good EMWA materials for solving electromagnetic information security and electromagnetic *** this article,three-dimensional network structure carbon nanofiber aerogels(3DNSCAs)are prepared by vacuum annealing of three-dimensional network structure agarose/zinc acetate obtained by freeze-drying of agarose/zinc acetate *** EMWA rubber composites with 2.2%(in mass)3DNSCAs have almost the same density as silicone rubber(PDMS),and the dispersity of 3DNSCAs in PDMS is studied by rheological *** effective absorption bandwidth(EAB,frequency for reflection loss2 mm thick PDMS/C-800 is 4 GHz,and the minimum value of reflection loss(RL_(min))is−52 dB with the thickness of 3.5 *** PDMS/C-1000 with the thickness of 3.5 mm has an EAB up to 4.8 *** cross section(RCS)reduction of PDMS/C-800 can achieve 20 dB⋅m2 at the frequency of 6 GHz.

关键词： Electromagnetic wave absorption Rubber composite Carbon aerogel Rheological behavior Power loss density

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insight into structural degradation of NCMs under extreme fast charging process

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Rare Metals 2024年第1期43卷 41-50页

作者： Yu Tang Xing-Yu Wang Jin-Can Ren Bo-Wen Chen Zhi-Yong Huang Wei Wang Ya-lan Huang Bing-Hao Zhang Si lan Zhang-Long He Qi Liu Hao He department of Physics City University of Hong KongHong Kong 999077China Shenzhen Research institute City University of Hong KongShenzhen 518057China College of Materials Science and engineering Changsha University of Science&TechnologyChangsha 410114China

Lithium-ion batteries(LiBs)with extreme fast charging(XFC)capability are considered an effective way to alleviate range anxiety for electric vehicle(EV)*** to the high ionic and electronic conductivity of LiNi_(x)Co_(y)Mn_zO_(2)(x+y+z=1,NCM)cathodes,the inevitable Li plating of graphite in NCM|graphite cell is usually identified as a key bottleneck for XFC ***,the capacity decay mechanism of cathode materials under XFC has not been fully *** this work,three typical NCM cathode materials with different Ni fractions were chosen and their electrochemical performances under XFC associated with structural evolution were investigated.A faster capacity decay of NCMs under XFC conditions is observed,especially for Ni-rich ***-situ X-ray diffraction(XRD)reveals that the multiple caxis parameters appear at the high-voltage regions in Nirich NCMs,which is probably triggered by the larger obstruction of Li(de)***,NCMs with moderate Ni fraction also present a similar trend under XFC *** phenomenon is more detrimental to the structural and morphological stability,resulting in a faster capacity decay than that under low current *** work provides new insight into the degradation mechanism of NCMs under XFC conditions,which can promote the development of NCM cathode materials with XFC capability.

关键词： Lithium-ion batteries Ni fraction Extreme fast charging Structural evolution

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Effect of Dy on Structure and Magnetic Properties of Dy_xFe_(60.5-x)Pt_(39.5) Alloys

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Journal of Wuhan university of Technology(Materials Science) 2010年第1期25卷 135-137页

作者：左卫群 department of information of Materials Science and engineering Guilin University of Electronic Technology

Effects of the content of Dy on structure and magnetic properties of DyxFe60.5-xPt39.5 alloys（x = 0, 0.5, 1.0, 1.5） were investigated. The results of XRD analysis proved that the phase-transitional temperature of DyxFe60.5-xPt39.5 alloys from disordered face-centered-cubic structure to ordered face-centered-tetragonal cubic structure decreases with the increase of the content of Dy（x）. Suitable content of Dy can improve the exchange coupling between soft magnetic phase and hard magnetic phase by refining grain size, while the remanence ratio and coercivity of the Fe60.5Pt39.5 alloy can be significantly improved by a small replacement of Fe by Dy, good magnetic properties were obtained in Dy0.5Fe60.0Pt39.5 alloys.

关键词： phase transformation degree of order grain size exchange coupling

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