Results 21 to 30 of about 5,288 (159)

Creating constellations of coexistence through connections between people in human–wildlife conflict areas

open access: yesConservation Biology, Volume 38, Issue 6, December 2024.
Abstract Human–wildlife conflict (HWC) is a critical challenge to human development and well‐being and threatens biodiversity conservation. Ideally, HWC mitigation should benefit both wildlife and communities and limit the costs associated with living alongside wildlife.
Aalayna R. Green   +8 more
wiley   +1 more source

The Study of Band Engineering and Polarization-induced Doping in AlGaN-based Deep Ultraviolet Light-Emitting Diode [PDF]

open access: yes, 2016
Ⅲ族氮化物作为新一代半导体材料,具有宽直接带隙、高电子漂移率、高热导率、耐高温、抗腐蚀、抗辐射等优点,适合制作高频、高功率、耐高温和抗辐射的电子器件,比如AlGaN基紫外发光二极管。但是紫外发光二极管依然存在低量子效率、低光输出功率等问题,提高晶体质量和载流子注入效率是解决问题的两个主要思路。影响载流子注入效率的一个重要因素是内部极化场引起的能带弯曲,本文基于APSYS软件,主要围绕紫外LED的能带调控和极化诱导掺杂展开研究。 首先,本文回顾了紫外LED的发展历程,介绍了AlGaN半导体材料的结构和性质,
刘松青
core  

A N–CoSe/CoSe2–C@Cu hierarchical architecture as a current collector‐integrated anode for potassium‐ion batteries

open access: yesRare Metals, Volume 43, Issue 8, Page 3702-3712, August 2024.
Graphical abstract AbstractThe highly reversible insertion/extraction of large‐radius K+ into electrode materials remains a tough goal, especially for conversion‐type materials. Herein, we design a current collector‐integrated electrode (N–CoSe/CoSe2–C@Cu) as an advanced anode for potassium‐ion battery (PIBs).
Zi‐Jie Mu   +9 more
wiley   +1 more source

中空夹层玻璃及其支承系统的爆炸冲击响应研究

open access: yesJianzhu Gangjiegou Jinzhan, 2023
玻璃幕墙已被广泛应用于建筑结构中,但目前的设计主要针对静力荷载,对可能发生的爆炸等意外事件所产生的冲击荷载作用尚缺乏可靠研究。对爆炸冲击下的玻璃进行数值分析时,多数研究模型将边界条件过度简化,使玻璃面板直接承受爆炸冲击,忽略了支承体系中诸如框架、垫片、结构胶、滑移块等元件的缓冲作用。这种差异在中空夹层玻璃系统上更为明显,导致数值分析难以精确地模拟结构系统在冲击荷载作用下的响应。为此,对一玻璃幕墙系统进行足尺爆炸冲击试验研究,并采用LS-DYNA软件进行了精细化建模 ...
郭校宏   +4 more
doaj  

The preparation and growth technology of MgZnO quasi-ternary alloys [PDF]

open access: yes, 2017
近几年来,随着半导体工业的不断发展,作为第三代半导体材料,宽禁带GaN和ZnO越来越受到研究人员的重视。GaN材料已经广泛应用于新型光电器件领域。相比于GaN材料,ZnO材料有着更高的激子束缚能(室温下60meV)和更加便宜的价格。这使得ZnO材料在紫外、深紫外发光与探测领域有着非常广阔的应用前景。作为ZnO基材料家族中的一员,MgZnO材料有着独特的优势,可以通过调剂Mg/Zn组分来调节MgZnO材料的带隙,推动ZnO基材料在紫外与深紫外应用的进一步发展。想要制备出高质量的ZnO基半导体器件 ...
贺钟冶
core  

Spray pyrolysis‐derived W‐doped MoSe2/rGO paper‐like microspheres: optimization of microstructure and mesostructure for enhanced lithium storage

open access: yesRare Metals, Volume 43, Issue 7, Page 3019-3031, July 2024.
Graphical abstract AbstractTwo‐dimensional MoSe2 is a promising candidate for lithium‐ion battery anodes. However, its conductivity and lithium storage volumetric effect still need to be optimized. In this work, W‐doped MoSe2/rGO paper‐like microspheres are successfully prepared through ultrasonic spray pyrolysis, achieving optimization at both the ...
Wei Wang   +9 more
wiley   +1 more source

The improvement and investigation of high efficiency white lighting-emitting diodes based on GaN materials [PDF]

open access: yes, 2017
氮化镓基发光二极管具有较高的发光效率,蓝光LED芯片配合黄光荧光粉是当前半导体照明的最核心技术。随着技术的发展,白光LED发光效率在逐年提升。本文从GaN基LED的需求为出发点,利用金属氧化物化学气相沉积(MOCVD)系统为研究工具,采用磁控溅射生长的氮化铝(AlN)作为新型缓冲层,生长了高质量的InGaN/GaN多量子阱(MQW)外延片。主要研究内容是AlN缓冲层的生长条件,高温GaNbuffer的探索及位错对LED光电特性的影响。本论文所取得的主要的研究成果如下: 1 ...
朱学亮
core  

The game of energy transition: A game theoretical perspective on public participation procedures in infrastructure planning

open access: yesEuropean Policy Analysis, Volume 10, Issue 1, Page 39-60, Winter 2024.
Abstract For energy transition, infrastructure construction is often indispensable but also contested and potentially problematic for social cohesion. Through a game theoretical lens, we examine the basic configuration of infrastructure conflicts. Informed by the empirical example of German electricity grid planning, we discuss three approaches to ...
Eva Ruffing, Viktoria Brendler
wiley   +1 more source

Device Quality GaN on Sapphire Grown by Three-step MOCVD [PDF]

open access: yes, 2001
在传统的二步MOCVD外延生长的基础上 ,报道了一种在低压MOCVD中用三步外延生长GaN材料的新方法 ,它在生长低温缓冲层前 ,用原子层的方法生长一层高质量的AlN层来减少Al2 O3与GaN缓冲层之间的应力以提高缓冲层的质量 ,从而提高外延层GaN的质量 ,达到器件制作的要求福建省自然科学基金重点资助项目 (E982 0 0 0 ...
刘宝林
core  

Investigation of inverted metamorphic multi-junction solar cell epitaxy and device [PDF]

open access: yes, 2017
倒装多结太阳能电池相对于传统的Si基多结太阳能电池或传统的化合物三结太阳能电池具有更高的光电转换效率和更广泛的应用方式。本论文对外延关键技术及结构,如宽禁带隧穿结技术,PIN结构,应力缓冲层技术等在聚光倒装多结太阳能电池上的应用进行了研究。进一步对空间三结太阳能电池,空间四结太阳能电池,GaInP/GaInAs//Si键合三结太阳能电池及柔性倒装三结太阳能电池等进行了探索。取得主要成果如下: 1.采用AlGaAs/GaInP宽禁带隧穿结的电池短路电流为14.27A,相对于AlGaAs ...
李森林
core  

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