|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Efficient InGaN-based yellow-light-emitting diodes显示文摘Realization of efficient yellow-light-emitting diodes(LEDs) has always been a challenge in solid-state lighting.Great effort has been made, but only slight advancements have occurred in the past few decades. After comprehensive work on InGaN-based yellow LEDs on Si substrate, we successfully made a breakthrough and pushed the wall-plug efficiency of 565-nm-yellow LEDs to 24.3% at 20 A∕cm^2 and 33.7% at 3 A∕cm^2. The success of yellow LEDs can be credited to the improved material quality and reduced compressive strain of InGaN quantum wells by a prestrained layer and substrate, as well as enhanced hole injection by a 3 D pn junction with V-pits. | FENGYI JIANG JIANLI ZHANG LONGQUAN XU JIE DING GUANGXU WANG XIAOMING WU XIAOLAN WANG CHUNLAN MO ZHIJUE QUAN XING GUO CHANGDA ZHENG SHUAN PAN JUNLIN LIU | 2019 | Photonics Research2019，7，2： | 13 |
| 2 | Efficient emission of InGaN-based light-emitting diodes:toward orange and red显示文摘Indium gallium nitride(InGaN)-based light-emitting diodes(LEDs)are considered a promising candidate for red-green-blue(RGB)micro displays.Currently,the blue and green LEDs are efficient,while the red ones are inefficient for such applications.This paper reports our work of creating efficient InGaN-based orange and red LEDs on silicon(111)substrates at low current density.Based on the structure of InGaN yellow LEDs,by simply reducing the growth temperature of all the yellow quantum wells(QWs),we obtained 599 nm orange LEDs with peak wall-plug efficiency(WPE)of 18.1%at 2 A/cm^2.An optimized QW structure was proposed that changed two of the nine yellow QWs to orange ones.Compared with the sample containing nine orange QWs,the sample with two orange QWs and seven yellow QWs showed similar emission spectra but a much higher peak WPE up to 24.0%at 0.8 A/cm^2 with a wavelength of 608 nm.The improvement of peak WPE can be attributed to the improved QW quality and the reduced active recombination volume.Subsequently,a series of efficient InGaN-based orange and red LEDs was demonstrated.With further development,the InGaN-based red LEDs are believed to be attainable and can be used in micro LED displays. | Shengnan Zhang Jianli Zhang Jiangdong Gao Xiaolan Wang Changda Zheng Meng Zhang Xiaoming Wu Longquan Xu Jie Ding Zhijue Quan Fengyi Jiang | 2020 | Photonics Research2020，8，11： | 10 |
| 3 | Jurassic Hornblende Gabbros in Dongga,Eastern Gangdese,Tibet:Partial Melting of Mantle Wedge and Implications for Crustal Growth显示文摘The Gangdese batholith, more than 2500 km in length, is composed mainly of JurassicMiocene igneous rocks. This batholith is one of the most important constituents of the Tibetan orogenesis and provides an ideal place for study of Neo-Tethyan ocean geodynamic evolution and plateau uplift. Recent studies on the Gangdese Jurassic felsic magmatism highlight its juvenile source. However, important aspects concerning the genesis of the juvenile magmatism and related deep geodynamic evolution are still unclear. Here, we report detailed petrological, geochronological, geochemical, whole-rock Sr-Nd isotopic, and in situ Sr-Hf isotopic data for a recently identified hornblende gabbro in the Dongga area, southern Lhasa sub-block. This hornblende gabbro is dominated by hornblende and plagioclase, dated at Early Jurassic(ca. 180–190 Ma), and characterized by a narrow compositional range in SiO_2(49.38wt%–52.27wt%), MgO(4.08wt%–7.00wt%), FeO(10.43wt%–11.77wt%), Na_2O(2.58wt%–3.51wt%), and K_2O(0.48wt%–1.53wt%). It has depleted isotopic signatures, with whole-rock(^(87)Sr/^(86)Sr)i ratios of 0.7033–0.7043, ε_(Nd)(t) values of +4.90 to +6.99, in situ plagioclase(^(87)Sr/^(86)Sr)i ratios of 0.7034–0.7042, and zircon ε_(Hf)(t) of +12.2 to +16.8. Our results integrated with published data suggest a model of Gangdese juvenile crustal growth by a subduction-related water-enriched mantle wedge. The hydrous partial melting of the lithosphere mantle was triggered by the dehydration of a Neo-Tethyan oceanic slab. This mafic magmatism emplaced in the middle-lower crust of intraoceanic arcs or active continental margins, leading to Jurassic juvenile crustal growth in southern Tibet. | XU Bo HOU Zengqian ZHENG Yuanchuan ZHOU Ye ZHOU Limin YANG Yu HAN Yanwei ZHEN Guo WU Changda | 2017 | Acta Geologica Sinica(English Edition)2017，91，2： | 7 |
| 4 | Unsaturated-sulfur-rich MoS2 nanosheets decorated on free-standing SWNT film: Synthesis, characterization and electrocatalytic application显示文摘此处,我们报导一条自底向上的 solvothermal 线路综合为氢进化反应的灵活、高度有效的瞬间 2@SWNT electrocatalyst (她的) 。描述表明包含 sulfurrich 地点的像分支的瞬间 2 nanosheets 在一致地在自立的围单人赛的碳 nanotube (SWNT ) 上驱散的 situ 电影,能暴露更不饱和的硫原子,与活跃地点允许优秀电的接触。展出的灵活催化剂优秀她有低过电位的表演(~ 在 10 妈 / 厘米 2) 和小 Tafel 斜坡(41 mV/dec ) 的 150 mV。为了推进,解释改进表演,本地电子结构被 X 光检查吸收调查近边的结构(XANES ) 分析,证明不饱和的硫原子并且在瞬间 2 和 SWNT 之间的强壮的电子联合的存在。这研究提供一条在原处合成的线路在催化剂微观结构,电子结构,和性质之中创造新多功能的灵活 hybridized 催化剂和有用卓见进关系。 | Daobin Liu Weiyu Xu Qin Liu Qun He Yasir A. Haleem Changda Wang Ting Xiang Chongwen Zou Wangsheng Chu Jun Zhong Zhiqiang Niu Li Song | 2016 | Nano Research2016，9，7： | 7 |
| 5 | Dark matter direct search sensitivity of the PandaX-4T experiment显示文摘The Panda X-4T experiment, a 4-ton scale dark matter direct detection experiment, is being planned at the China Jinping Underground Laboratory. In this paper we present a simulation study of the expected background in this experiment. In a 2.8-ton fiducial mass and the signal region between 1-10 keV electron equivalent energy, the total electron recoil background is found to be 4.9 × 10^(-5) kg^(-1) d^(-1) keV^(-1). The nuclear recoil background in the same region is 2.8 × 10^(-7) kg^(-1) d^(-1) keV^(-1). With an exposure of 5.6 ton-years, the sensitivity of Panda X-4 T could reach a minimum spin-independent dark matter-nucleon cross section of 6 × 10^(-48) cm^2 at a dark matter mass of 40 Ge V/c^2. | HongGuang Zhang Abdusalam Abdukerim Wei Chen Xun Chen YunHua Chen XiangYi Cui BinBin Dong DeQing Fang ChangBo Fu Karl Giboni Franco Giuliani LinHui Gu XuYuan Guo ZhiFan Guo Ke Han ChangDa He ShengMing He Di Huang XingTao Huang Zhou Huang Peng Ji XiangDong Ji YongLin Ju ShaoLi Li Yao Li Heng Lin HuaXuan Liu JiangLai Liu YuGang Ma YaJun Mao KaiXiang Ni JinHua Ning XiangXiang Ren Fang Shi AnDi Tan AnQing Wang Cheng Wang HongWei Wang Meng Wang QiuHong Wang SiGuang Wang XiuLi Wang XuMing Wang Zhou Wang MengMeng Wu ShiYong Wu JingKai Xia MengJiao Xiao PengWei Xie BinBin Yan JiJun Yang Yong Yang ChunXu Yu JuMin Yuan JianFeng Yue Dan Zhang Tao Zhang Li Zhao QiBin Zheng JiFang Zhou Ning Zhou XiaoPeng Zhou | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，3： | 6 |
| 6 | In situ trapped high-density single metal atoms within graphene: Iron-containing hybrids as representatives for efficient oxygen reduction显示文摘因为他们为特殊催化作用的效率和 chemoselectivity 比传统的催化剂的那些优异,原子地驱散的催化剂在精力变换应用吸引了注意。然而,他们在支持上由于极其低的装载金属的内容有限制,在在高温度的金属地点和数量以及低稳定性的精确控制的困难。我们经由葡萄糖, dicyandiamide,和无机的金属盐的单个步的热热分解准备了一个高度做的单个金属原子混血儿。高角度的环形的黑暗扫描地的传播电子显微镜学(HAADF 茎) 和 X 光检查吸收罚款结构光谱学(XAFS ) 表明做进 graphene 矩阵的氮原子为由产生 metal-Nx 协作结构的金属原子稳定是枢轴的。由于 graphene 矩阵的强壮的抛锚效果,装载内容的金属是在孤立的原子混血儿的超过 4 wt.%( 磅内容象在做磅的混血儿的 9.26 wt.% 一样高) 。而且,单个做铁的混血儿(做 Fe@N 的 graphene ) 为氧减小反应显示出显著 electrocatalytic 表演。山峰力量密度是 199 | Daobin Liu Chuanqiang Wu Shuangming Chen Shiqing Ding Yaofeng Xie Changda Wang Tao Wang Yasir A. Haleem Zia ur Rehman Yuan Sang Qin Liu Xusheng Zheng Yu Wang Binghui Ge Hangxun Xu Li Song | 2018 | Nano Research2018，11，4： | 6 |
| 7 | Glycyrrhiza uralensis flavonoids inhibit brain microglial cell TNF-α secretion,p-IκB expression,and increase brain-derived neurotropic factor(BDNF)secretion显示文摘Objective:Asthma sufferers exhibit high prevalence of anxiety/depression.Elevated tumor-necrosis factor-alpha(TNF-α)levels in peripheral system and central nervous system(CNS)are associated with anxiety/depression,whereas brain-derived neurotropic factor(BDNF)has anti-depressant effects.An anti-asthma herbal medicine intervention ASHMI inhibits peripheral TNF-αsecretion in an animal model of asthma.We hypothesize that ASHMI and its compounds may have modulatory effects on CNS TNF-αand BDNF production.We sought to determine the effect of ASHMI and individual herb constituents on brain microglial cell TNF-αproduction,and identify the active compounds that suppress TNF-αand increase BDNF.Methods:BV-2 mouse microglial cells were pre-treated with ASHMI or extracts of Ganoderma lucidum(G.lucidum),Sophora flavescens Ait(S.flavescens),and Glycyrrhiza uralensis Fischer(G.uralensis),the herbal constituents in ASHMI,or individual compounds isolated from G.uralensis at different concentrations and then stimulated with LPS.TNF-αlevels in culture supernatants were measured by ELISA.The effect of active compounds on NFkB signaling pathway and on BDNF production were determined by western blotting and ELISA,respectively.Results:ASHMI produced dose-dependent inhibition of TNF-αsecretion by cultured-mousemicroglia BV2 cells.Of the three herb extracts in ASHMI,only G.uralensis significantly and dosedependently inhibited TNF-αproduction.Among the 5 flavonoids isolated from G.uralensis,isoliquiritigeninwas themost effective.Isoliquiritigenin suppression of TNF-αproduction was associated with attenuation of p-NF-kB expression,andwas accompanied by increased BDNF secretion.Conclusion:ASHMI and its effective flavonoid,isoliquiritigenin,inhibited TNF-αproduction by LPS stimulatedmicroglial cells and elevated BDNF levels,which may prove to have anti-CNS inflammatory and anti-anxiety effects. | Sangita P.Patil Changda Liu Joseph Alban Nan Yang Xiu-Min Li | 2014 | Journal of Traditional Chinese Medical Sciences2014，1，1： | 3 |
| 8 | Vacancy manipulating of molybdenum carbide MXenes to enhance Faraday reaction for high performance lithium-ion batteries显示文摘“Intrinsic”strategies for manipulating the local electronic structure and coordination environment of defect-regulated materials can optimize electrochemical storage performance.Nevertheless,the structure–activity relationship between defects and charge storage is ambiguous,which may be revealed by constructing highly ordered vacancy structures.Herein,we demonstrate molybdenum carbide MXene nanosheets with customized in-plane chemical ordered vacancies(Mo_(1.33)CT_(x)),by utilizing selective etching strategies.Synchrotron-based X-ray characterizations reveal that Mo atoms in Mo1.33CTx show increased average valence of+4.44 compared with the control Mo_(2)CT_(x).Benefited from the introduced atomic active sites and high valence of Mo,Mo_(1.33)CT_(x)achieves an outstanding capacity of 603 mAh·g^(−1)at 0.2 A·g^(−1),superior to most original MXenes.Li+storage kinetics analysis and density functional theory(DFT)simulations show that this optimized performance ensues from the more charge compensation during charge–discharge process,which enhances Faraday reaction compared with pure Mo_(2)CT_(x).This vacancy manipulation provides an efficient way to realize MXene’s potential as promising electrodes. | Xin Guo Changda Wang Wenjie Wang Quan Zhou Wenjie Xu Pengjun Zhang Shiqiang Wei Yuyang Cao Kefu Zhu Zhanfeng Liu Xiya Yang Yixiu Wang Xiaojun Wu Li Song Shuangming Chen Xiaosong Liu | 2022 | Nano Research Energy2022，1，3： | 2 |
| 9 | Biomass-derived hard carbon microtubes with tunable apertures for high-performance sodium-ion batteries显示文摘Sodium-ion batteries(SIBs)are considered the most up-and-coming complements for large-scale energy storage devices due to the abundance and cheap sodium.However,due to the bigger radius,it is still a great challenge to develop anode materials with suitable space for the intercalation of sodium ions.Herein,we present hard carbon microtubes(HCTs)with tunable apertures derived from low-cost natural kapok fibers via a carbonization process for SIBs.The resulted HCTs feature with smaller surface area and shorter Na+diffusion path benefitting from their unique micro-nano structure.Most importantly,the wall thickness of HCTs could be regulated and controlled by the carbonization temperature.At a high temperature of 1,600℃,the carbonized HCTs possess the smallest wall thickness,which reduces the diffusion barrier of Na+and enhances the reversibility Na+storage.As a result,the 1600HCTs deliver a high initial Coulombic efficiency of 90%,good cycling stability(89.4%of capacity retention over 100 cycles at 100 mA·g^(−1)),and excellent rate capacity.This work not only charts a new path for preparing hard carbon materials with adequate ion channels and novel tubular micro-nano structures but also unravels the mechanism of hard carbon materials for sodium storage. | Pin Song Shiqiang Wei Jun Di Jun Du Wenjie Xu Daobin Liu Changda Wang Sicong Qiao Yuyang Cao Qilong Cui Pengjun Zhang Liaobo Ma Jiewu Cui Yan Wang Yujie Xiong | 2023 | Nano Research2023，16，4： | 1 |
| 10 | An Improvement of the Minimum Distortion Encoding Algorithm for Vector Quantization显示文摘 | Bei Changda Gray R | 1985 | IEEE Transactions on Communication1985，33，10： | 1 |
| 11 | Study on the effect of dimple position on drag reduction of high-speed maglev train显示文摘Transient numerical simulations were carried out by placing dimples at the top,sides and bottoms of the tail car streamline area of a high-speed maglev train.The results of an improved delayed detached eddy simulation turbulence model using three-dimensional compressible Navier-Stokes and shear-stress transport K-Omega double equations were compared to the results of a wind tunnel test to verify the numerical simulation accuracy,within 5%of the ground truth,which is an acceptable precision range.The results show that dimples arranged on the streamline area atop the train tail car affected the locations at which the airflow at the top and bottom of the train met and weakened the strength of the wake.The aerodynamic drag and lift coefficient decreased by 3.40%and 4.27%,respectively.When the dimples were arranged on the streamline area at the sides or bottoms of the train tail car,they had little effect on the top of the tail car,so they did not destroy the balance of the airflow at the top and bottom.They also had little influence on the development of wake topology.Therefore,the aerodynamic drag and lift of the train changed little. | Dan Zhou Liliang Wu Changda Tan Tian’en Hu | 2021 | Transportation Safety and Environment2021，3，4： | 1 |
| 12 | Relection of elastic waves at the elastically supported boundary of a couple stress elastic half-space显示文摘The relection elastic waves at the elastically supported boundary of a couple stress elastic half-space are studied in this paper. Different from the classical elastic solid, there are three kinds of elastic waves in the couple stress elastic solid, and two of them are dispersive. The boundary conditions of a couple stress elastic half-space include the couple stress vector and the rotation vector which disappear in the classical elastic solids. These boundary conditions are used to obtain a linear algebraic equation set, from which the amplitude ratios of relection waves to the incident wave can be determined. Then, the relection coeficients in terms of energy lux ratios are calculated numerically, and the normal energy lux conservation is used to validate the numerical results. Based on these numerical results,the inluences of the boundary parameters, which relect the mechanical behavior of elastic support, on the relection energy partition are discussed. Both the incident longitudinal wave(the P wave) and incident transverse wave(the SV wave) are considered. | Changda Wang Xuejun Chen Peijun Wei Yueqiu Li | 2017 | Acta Mechanica Solida Sinica2017，30，2： | 1 |
| 13 | Structured vortices generated by metasurface holography显示文摘Highly customized and miniaturized structured light is expected in many application fields.A kind of structured vortex generators is proposed based on a metasurface consisting of rectangular nanoholes etched in a silver film,and the generated vortices with the same or different topological charges are distributed along the radial direction.The geometric metasurface is completed with the help of optical holography technology,and the structured vortex generator possesses high working efficiency and large information capacity.The proposed vortex generators work under circularly polarized light illumination,and the reproduced vortices of multiplexing vortex generator depend on the handedness of the circularly polarized light.This work paves a way to generate new structured light fields.The radially distributed vortices may be utilized to simultaneously screen or separate microparticles.The compact design of the structured vortex generator and the convenient switch of different structured vortices will be a benefit to expand the applications of structured vortex fields. | ZHEN MOU CHANGDA ZHOU PEIYAO LU QINGYANG YUE SHUYUN WANG SHUYUN TENG | 2021 | Photonics Research2021，9，10： | 1 |
| 14 | An Improvement of the Minimum Distortion Encoding Algorithm for Vector Quantization显示文摘 | Bei Changda Gray R M | 1985 | IEEE Transactions on Communications1985，33，10： | 1 |
| 15 | The interpretation of gravity anomaly on lunar Apennines显示文摘The lunar Apennines,located in the southeast of Mare Imbrium,is the largest range on the Moon. The gravity anomalies on profiles across the mountains reveal evidence of a great fault zone characteristic. The deep crustal structures of lunar Apennines are analyzed on the basis of topographic data from Chang'E-1 satellite and gravity data from Lunar Prospector. The inverted crust-mantle models indicate the presence of a lithosphere fault beneath the mountains. Inverted results of gravity and the hypothe-sis of lunar thermal evolution suggest that the lunar lithosphere might be broken ~3.85 Ga ago due to a certain dynamic lateral movement and compression of lunar lithosphere. This event is associated with the history of magma filling and lithosphere deformation in the mountain zone and adjacent area. Moreover,the formation and evolution of Imbrium basin impose this effect on the process. | CHEN Chao CHEN Bo PING JinSong LIANG Qing HUANG Qian ZHAO WenJin ZHANG ChangDa | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，12： | 1 |
| 16 | Correlation analysis of organic matter content and spectral reflection properties of the soil in southern Xinjiang显示文摘 | Xu Binbin Dai Changda | 1980 | Chinese Science Bulletin1980，25，12： | 1 |
| 17 | The Information of Thematic Mapper Data and the Optical Band Combination显示文摘 | Dai Changda Lei Liping | 1989 | Remote Sensing of Environment China1989，4，4： | 1 |
| 18 | The Effect of Concave Size on the Aerodynamics of a Maglev Train显示文摘Inspired by shark’s skin in nature,a non-smooth surface could be an ideal model for changing the flow characteristics of fluids on the object surface.To analyze the effect of a non-smooth surface with concaves on the maglev train aerodynamic performances and to investigate how the concave size affects the aerodynamic forces and flow structure of a maglev train,four 1/10th scaled maglev train models are simulated using an Improved Delayed Detached Eddy Simulation(IDDES)method.The numerical strategy used in this study is verified by comparison with the wind tunnel test results,and the comparison shows that the difference was in a reasonable range.The results demonstrate that the concaves could effectively reduce the tail car pressure drag,thus reducing the total drag,and that the smaller the concave size was,the better the drag reduction effect would be.The change in the lift with the concave size was more significant than that of the drag,and the tail car lift of R1(0.0012H),R2(0.0024H),and R3(0.0036H)train models was 30.1%,43.0%,and 44.5%less than that of the prototype,respectively.In addition,different flow topologies of the wake are analyzed.The width and height of the vortex core of the counter-rotating vortices tended to decrease with the concave size.Thus,from the point of view of ensuring the operating safety of a maglev train,a non-smooth surface with small-size concaves is recommended. | Shuang Meng Dan Zhou Changda Tan | 2022 | Journal of Bionic Engineering2022，19，3： | 1 |
| 19 | Influence of ligands on the photoluminescent properties of Eu3+ in europium β-diketonate/PMMA-doped systems显示文摘 | LIU H G SEONGTAE P KIWAN J FENG X S CHANGDAE K SEO H J LEE Y I | 2004 | Journal of Luminescence2004，106，： | 1 |
| 20 | Multilevel security model for ad hoc networks显示文摘Modern battlefield doctrine is based on mobility, flexibility, and rapid response to changing situations. As is well known, mobile ad hoc network systems are among the best utilities for battlefield activity. Although much research has been done on secure routing, security issues have largely been ignored in applying mobile ad hoc network theory to computer technology. An ad hoc network is usually assumed to be homogeneous, which is an irrational assumption for armies. It is clear that soldiers, commanders, and commanders-in-chief should have different security levels and computation powers as they have access to asymmetric resources. Imitating basic military rank levels in battlefield situations, how multilevel security can be introduced into ad hoc networks is indicated, thereby controlling restricted classified information flows among nodes that have different security levels. | Wang Changda Ju Shiguang | 2008 | Journal of Systems Engineering and Electronics2008，19，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员