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Universal,predominant exciton transfer in perovskite nanocrystal solids

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Science China Materials 2024年第9期67卷 2818-2827页

作者： Yuqing Luo Zhiya Dang Lingchen Meng zelong chen Zihao Li Tongtong Lu Xiaobin Rao Shuyuan Zhao Qi Sun Pingqi Gao School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen518107China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou510006China State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Perovskite nanocrystal(PNC)solids are promising materials for optoelectronic *** studies have shown that exciton diffusion in PNC solids occurs via alternate exciton hopping(EH)and photon recycling(PR).The energy disorder induced by the size distribution is a common factor in PNC solids,and the impact of this energy disorder on the exciton diffusion remains ***,we investigated the exciton diffusion in CsPbBr3 NC solids with a Gaussian size distribution of 11.2±6.8 nm via steady and time-resolved photoluminescence(PL)spectroscopy with multiple detection bands in transmission *** results indicated that exciton diffusion was controlled by a downhill transfer among the different energy sites through the disordered energy landscape,as confirmed by the accompanying low-temperature PL analysis.A detailed examination revealed that the acceptor distribution in tandem with the reabsorption coefficient determined the contribution of EH and PR to exciton transfer between different energy ***,the exciton diffusion mechanism varied in PNC solids of different thicknesses:in a thin solid with a thickness of several hundred nanometers,the exciton transfer was dominated by efficient EH and PR from the high-energy sites to the lower-energy sites;in a few-micrometer-thick solid,transfer from the medium-energy sites toward the lower-energy sites also became prominent and occurred mainly through *** findings enhance the understanding of the vital role that the acceptor distribution plays in the exciton diffusion process in PNC solids,providing important insights for optoelectronic applications based on PNC *** work also exploits the use of commonly available tools for in-depth exciton diffusion studies,which reveals the interior diffusion information that is usually hidden in surface sensitive PL imaging methods.

关键词： photoluminescence spectroscopy exciton diffusion exciton transfer perovskite nanocrystals photon recycling exciton hopping reabsorption

A statistical study on the correlation between sporadic Ca+ layer and Es in Beijing（40.5°N, 116°E）

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Earth and Planetary Physics 2024年第5期8卷 753-761页

作者： YuChang Xun ZhiShan chen LiFang Du HaoRan Zheng Jing Jiao zelong Wang ShaoHua Gong GuoTao Yang College of Physics College of Electronic Information and Optical Engineering Taiyuan University of Technology State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences School of Science Jiangsu University of Science and Technology School of Physics and Electronics Engineering Hainan Normal University

From April 2020 to June 2022, a Ca+lidar with dual-wavelength and narrow-band emitting lasers utilizing all-solid-state technology was employed to conduct observations in Beijing（40.41°N, 116.01°E） for a total duration of 1797.79 hours over 280 nights. A total of 286 sporadic Ca+layers were observed, with heights ranging from 88 to 120 km and densities varying from 5.33 to 2200 cm-3. We simultaneously observed the ionosonde, located 28 km from the lidar, and found a correlation of 61.89% between the sporadic Ca+ layer and the sporadic E layer. When the sporadic Ca+layer has a downward phase trend, there is a correlation of 76.84%. By excluding the influence of ionosonde sensitivity, we focus only on calcium ions that have a density exceeding 140 cm-3, which exhibit a correlation of82.25%. Above 100 km, the correlation significantly increases, reaching approximately 90%. Furthermore, the correlation between the sporadic Ca+ layer and the sporadic E layer is particularly noticeable during the summer season, reaching around 90%. This phenomenon can be attributed to the variations in metal ions that occur during different seasons.

关键词： the Meridian Project lidar sporadic Ca+ layer sporadic E layer

Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 438-452页

作者： Chong Wang Fuyuan Liu Xuejian Wang Enyu Guo zelong Du Kunkun Deng Zongning chen Huijun Kang Guohao Du Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Mechanical Engineering Guizhou UniversityGuiyang 550025China Ningbo Institute of Dalian University of Technology Ningbo 315000China Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute CASShanghai 201204China

The semi-solid stir casting method is adopted to prepare 10 wt%SiC_(p)/Mg-6Zn-0.5Ca-xAl(x=0,1,3 and 5 wt%)composites,and the microstructure evolution and mechanical property of composites with various Al content are *** results show that the addition of 3 wt%Al improves the distribution of SiC_(p),whereas the SiC_(p) cluster occurs again with Al content greater than 3%.An abnormal phenomenon of twinning is observed in the cast composites in this *** SiC_(p)/Mg-6Zn-0.5Ca composite possesses the highest twin content of~23%,for which tension twins(TTW)and compression twins(CTW)account for~19%and~3%,*** CTW is only observed in ZXA600 *** addition of Al has an inhibiting effect for the generation and growth of *** content of twin decreases firstly and then increases with increase of Al *** lowest twin content is obtained as Al increases to 3 wt%.It is found the existence of twin is detrimental to the mechanical property of ***-cast SiC_(p)/Mg-6Zn-0.5Ca-3Al composite with the lowest twin content exhibits the optimal mechanical property of yield strength,ultimate tensile strength and elongation for 100 MPa,188 MPa and 4.4%,*** outstanding mechanical property is attributed to the uniform distribution of SiC_(p),the low twin content and the well-distributed fine second phases.

关键词： Mg matrix composite Synchrotron tomography Twinning Liquid melt processing Mechanical property

Construction of Dynamic Alloy Interfaces for Uniform Li Deposition in Li-Metal Batteries

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Energy & Environmental Materials 2024年第3期7卷 64-71页

作者： Qingwen Li Yulu Liu Ziheng Zhang Jinjie chen zelong Yang Qibo Deng Alexander V.Mumyatov Pavel A.Troshin Guang He Ning Hu Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Tianneng Co.Ltd Huzhou 313100China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehiclesand School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry Academician Semenov ave.1Chernogolovka Moscow Region 142432Russia Zhengzhou Research Institute of HIT 26 Longyuan East 7thJinshui DistrictZhengzhou 450000Henan Province China Harbin Institute of Technology 92 West Dazhi StreetNan Gang DistrictHarbin 150001China

It is well accepted that a lithiophilic interface can effectively regulate Li deposition behaviors,but the influence of the lithiophilic interface is gradually diminished upon continuous Li deposition that completely isolates Li from the lithiophilic ***,we perform in-depth studies on the creation of dynamic alloy interfaces upon Li deposition,arising from the exceptionally high diffusion coefficient of Hg in the amalgam solid *** a comparison,other metals such as Au,Ag,and Zn have typical diffusion coefficients of 10-20 orders of magnitude lower than that of Hg in the similar solid solution *** difference induces compact Li deposition pattern with an amalgam substrate even with a high areal capacity of 55 mAh cm^(-2).This finding provides new insight into the rational design of Li anode substrate for the stable cycling of Li metal batteries.

关键词： diffusion coefficient dynamic alloy interfaces Li dendrites Li solid solution uniform Li deposition

Effects of different energy levels in low-protein diet on liver lipid metabolism in the late-phase laying hens through the gut-liver axis

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Journal of Animal Science and Biotechnology 2024年第5期15卷 2122-2136页

作者： Hong Hu Ying Huang Anjian Li Qianhui Mi Kunping Wang Liang chen zelong Zhao Qiang Zhang Xi Bai Hongbin Pan Yunnan Provincial Key Laboratory of Animal Nutrition and Feed Science Faculty of Animal Science and TechnologyYunnan Agricultural UniversityKunming 650201China College of Animal Science Anhui Science and Technology UniversityBengbu 233000China State Key Laboratory of Animal Nutrition Institute of Animal SciencesChinese Academy of Agriculture SciencesBeijing 100193China Shanghai BIOZERON Biotechnology Co. LtdShanghai 201800China WOD Poultry Research Institute Beijing 100193China

Background The energy/protein imbalance in a low-protein diet induces lipid metabolism disorders in late-phase laying *** energy levels in the low-protein diet to adjust the energy-to-protein ratio may improve fat deposition,but this also decreases the laying performance of *** study investigated the mechanism by which different energy levels in the low-protein diet influences liver lipid metabolism in late-phase laying hens through the enterohepatic axis to guide feed optimization and nutrition strategies.A total of 288 laying hens were randomly allocated to the normal-energy and normal-protein diet group(positive control:CK)or 1 of 3 groups:lowenergy and low-protein diet(LL),normal-energy and low-protein diet(NL),and high-energy and low-protein diet(HL)*** energy-to-protein ratios of the CK,LL,NL,and HL diets were 0.67,0.74,0.77,and 0.80,*** Compared with the CK group,egg quality deteriorated with increasing energy intake in late-phase laying hens fed low-protein *** fed LL,NL,and HL diets had significantly higher triglyceride,total cholesterol,acetylCo A carboxylase,and fatty acid synthase levels,but significantly lower hepatic lipase levels compared with the CK *** transcriptome sequencing revealed that genes involved in fatty acid beta-oxidation(ACOX1,HADHA,EHHADH,and ACAA1)were downregulated,whereas genes related to fatty acid synthesis(SCD,FASN,and ACACA)were upregulated in LL group compared with the CK *** of the cecal microbiome showed that in hens fed an LL diet,Lactobacillus and Desulfovibrio were enriched,whereas riboflavin metabolism was *** metabolites that were most significantly affected by the LL diet included several vitamins,such as riboflavin(vitamin B2),pantethine(vitamin B5 derivative),pyridoxine(vitamin B6),and 4-pyridoxic *** A lipid metabolism disorder due to deficiencies of vitamin B2 and pantethine originating from the metabolism of the cecal microb

关键词： Cecal microbiome Energy/protein imbalance Late-phase laying hens laying hens Liver lipid metabolism Low-protein diet Multi-omics

Predictive value of T cell receptor repertoire profiling for immunosuppressive therapy in severe aplastic anemia

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Genes & Diseases 2024年第1期11卷 95-98页

作者： Cunte chen Yuling Zhang Dongpei Lu zelong Zhang Jun Yang Xiaowei chen Ming Zhou Wenjian Mo Caixia Wang Qinghua Cai Yumiao Li Ruiqing Zhou Shilin Xu Wei Zhou Tingfen Deng Shiyi Pan Yanli Xu Shunqing Wang Yuping Zhang Department of Hematology Guangzhou First People's HospitalSouth China University of TechnologyGuangzhouGuangdong 510180China Guangzhou Junruikang Biotechnology Co. LtdGuangzhouGuangdong 510700China

Increasing evidence supports the hypothesis of autologous immune attack in severe aplastic anemia(SAA):the predominant role of activated cytotoxic T cells(CTL)expressing-interferon in inhibiting the growth of bone marrow(BM)cells,putative autoantigens,and oligoclonal expansion of CD8+T cells.1 For SAA patients,the definitive therapies are immunosuppressive therapy(IST)or hematopoietic stem transplantation(HSCT).

关键词： anemia aplastic interferon

考虑短距离电缆中行波特性的振荡波局部放电定位方法

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电网技术 2017年第6期41卷 2047-2054页

作者：周凯赵世林何珉陈泽龙李佳涵四川大学电气信息学院四川省成都市610065

由于短电缆中局部放电信号的入射波和反射波信号容易重叠,振荡波测试系统(oscillation wave test system,OWTS)一直以来对短距离电缆(小于500 m)的局部放电定位的精度较低。为实现短电缆中缺陷的精确定位,提出了新的振荡波局部放电定位... 详细信息

由于短电缆中局部放电信号的入射波和反射波信号容易重叠,振荡波测试系统(oscillation wave test system,OWTS)一直以来对短距离电缆(小于500 m)的局部放电定位的精度较低。为实现短电缆中缺陷的精确定位,提出了新的振荡波局部放电定位方法:采用高带通Rogowski线圈与宽带通示波器实现局部放电信号的捕捉,并对单个局部放电信号特征频率连续小波分解与能量峰值识别算法相结合的方式,优化对局放单脉冲波形的识别,同时根据多组样本的分布情况进行聚类分析,提高短电缆缺陷的定位精度。根据所提出的方法,对64 m交联聚乙烯短电缆中制造2处缺陷,并搭建实验对缺陷进行定位。结果表明,该方式能够准确地探测出距离电缆首端32 m处及61 m处的缺陷,误差范围控制在2%,较大程度提高OWTS对短电缆的定位精度。

关键词：振荡波测试系统短电缆局部放电连续小波分解能量峰值识别定位

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低压减载广域配置及站域整定优化方案

电网技术 2015年第8期39卷 2333-2339页

作者：和敬涵陈泽龙 TONY Yip 刘琳徐云鹍北京交通大学电气工程学院北京市海淀区100044

为使低压减载方案更具可行性,将低压减载整体方案分为广域配置和站域整定2个层面分别进行优化。在广域层面,提出基于风险分析的低压减载地点优化选择方法,同时兼顾减载后的系统稳定性和经济性。在站域层面,利用站域信息提出基于PV曲线(... 详细信息

为使低压减载方案更具可行性,将低压减载整体方案分为广域配置和站域整定2个层面分别进行优化。在广域层面,提出基于风险分析的低压减载地点优化选择方法,同时兼顾减载后的系统稳定性和经济性。在站域层面,利用站域信息提出基于PV曲线(传输界面潮流与节点电压关系曲线)自适应确定各轮次整定值和减载量,基于模糊综合评价算法优化减载顺序。仿真算例结果验证了所提方案的可行性。

关键词：低压减载风险分析 PV曲线模糊综合评价

基于电流转移比例系数的复杂网络输电断面识别方法

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电网技术 2017年第3期41卷 915-921页

作者：王紫琪和敬涵张大海陈泽龙电力系统保护与控制实验室(北京交通大学) 北京市海淀区100044 国网长春供电公司吉林省长春市130000

输电断面的可靠识别对预防连锁过载跳闸具有重要意义。根据潮流转移的路径特征及电流特性,提出一种基于电流转移比例系数的复杂网络输电断面识别方法。构建电网拓扑模型及图论矩阵,并在此基础上简化系统网络;通过关联矩阵不定向搜索方... 详细信息

输电断面的可靠识别对预防连锁过载跳闸具有重要意义。根据潮流转移的路径特征及电流特性,提出一种基于电流转移比例系数的复杂网络输电断面识别方法。构建电网拓扑模型及图论矩阵,并在此基础上简化系统网络;通过关联矩阵不定向搜索方法建立旁侧路径库,限定输电断面的识别范围;采用回路电流法快速求解复杂耦合网络中各线路电流转移比例系数;考虑潮流正向叠加及反向对消作用进行比例系数修正,并据此确定输电断面集合,有效避免了反向过载路径的遗漏。最后,将耦合系统、新英格兰10机39节点系统和IEEE 118节点系统的断面识别结果与仿真数据进行对比,验证了所提输电断面识别方法的准确性和有效性。

关键词：输电断面耦合网络旁侧通路电流转移比例系数潮流转移