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Regulation of photophysical and electronic properties of I-III-VI quantum dots for light-emitting diodes

Science China Materials 2024年第9期67卷 2737-2748页

作者： Xiaofei Dong Xianggao li Shougen Yin Zheng li longwu li Jingling li School of Science Langfang Normal UniversityLangfang 065000China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Institute of Material Physics Key Laboratory for Optoelectronic Materials and Devices of TianjinKey Laboratory of Display Materials and Photoelectric Devices of Ministry of EducationTianjin University of TechnologyTianjin 300384China College of Chemistry and Materials Science Langfang Normal UniversityLangfang 065000China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China

Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color gamut,and low *** in the luminous efficiency and operating life of QLEDs have been achieved by enhancing the photoluminescence efficiency of the quantum dots(QDs)and optimizing the device ***,the current mainstream QDs contain heavy metal elements such as lead and cadmium,which restrict the development and application of QD *** new types of environmentally friendly QDs is crucial.I-III-VI semiconductor QDs have been developed as luminescent materials for constructing high color rendering index QLEDs,owing to the outstanding photophysical properties of these QDs,such as composition-dependent tunable bandgap,large Stokes shift,and highefficiency ***,the microstructures of heterojunctions,especially the surface states and interface states,affect the recombination and transport of carriers in electroluminescent(EL)devices with multilayer thin film structures,which in turn influence the luminous efficiency and stability of the *** review focuses on the synthesis strategies of I-III-VI multi-component QDs and provides an in-depth understanding of the luminescence mechanism and the regulation of photophysical and electronic ***,the application of I-III-VI QDs in multi-color and white EL QLEDs is discussed and the challenges and outlook are addressed.

关键词： Ⅰ-Ⅲ-Ⅵquantum dots synthesis method defect states luminescence mechanism light-emitting diodes

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海昏侯刘贺墓的财富之谜

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地方文化研究 2016年第3期4卷 1-7页

作者：黎隆武中共江西省委宣传部江西南昌330036

海昏侯墓出土了万余件精美文物,其中的金器、玉器、青铜器、漆器之多,反映了海昏侯刘贺拥有巨量的财富。文章针对海昏侯刘贺墓财富数量、财富的来源及这些财富在经历了两千余年之后所能保存下来的原因作了细致考察,认为其财富主要来源... 详细信息

海昏侯墓出土了万余件精美文物,其中的金器、玉器、青铜器、漆器之多,反映了海昏侯刘贺拥有巨量的财富。文章针对海昏侯刘贺墓财富数量、财富的来源及这些财富在经历了两千余年之后所能保存下来的原因作了细致考察,认为其财富主要来源于自身的积累、其父之遗产、上两辈的馈赠、朝廷及亲友的赙赠和海昏侯任上铸造等几个方面,而刘贺墓及其财富之所以能够完好保存,则在于特定的时空环境和考古发掘的及时跟进。

关键词：海昏侯刘贺墓财富来源保存

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主备发射机与天线切换系统设计

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电声技术 2022年第6期46卷 135-137页

作者：李龙武江西七〇六电视调频台江西吉安343000

广播电视发射台一般都具有多种频率的广播,为了保证安全播出,都会配备主、备天线。在有条件的情况下,一个频率的广播会配备主、备发射机。为保障主、备发射机与主、备天线能够顺利切换,本文设计了一款成本较低的主备发射机与天线切换系... 详细信息

广播电视发射台一般都具有多种频率的广播,为了保证安全播出,都会配备主、备天线。在有条件的情况下,一个频率的广播会配备主、备发射机。为保障主、备发射机与主、备天线能够顺利切换,本文设计了一款成本较低的主备发射机与天线切换系统,可有效地保障安全播出工作。对于成本受限的发射站台而言,具有非常重要的意义。

关键词：切换系统发射机天线广播电视

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Identifying the scope of the Lhasa Metropolitan Area based on a spatial field energy model

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Journal of Geographical Sciences 2021年第2期31卷 245-264页

作者： WANG Zhenbo li Jiaxin liANG longwu Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

The cultivation and development of modern metropolitan areas with the aim of establishing new regional centers with competitive edge is a key objective for the new-type urbanization directions in *** construction of the Lhasa Metropolitan Area is of great significance for the promotion of the South Asia Channel,the‘Belt and Road’initiative,the Bangladesh-China-India-Myanmar Economic Corridor,the Himalaya Economic Cooperation Zone,and for rapid development and long-term stability of the Qinghai-Tibet *** paper examines the scope of the Lhasa Metropolitan Area including Chengguanqu(Chengguan District),Doilungdeqen,Dagze,Lhunzhub,Damxung,Nyemo,Quxu,Maizhokunggar,Samzhubze Qu(Samzhubze District),Gyangze,Rinbung,Bainang,Nedong,Gonggar,and Zhanang using a spatial field energy model that combines nodality and accessibility indices and considers multiple indicators including traffic flow between *** combining factors such as the natural background,population agglomeration,the social economy,infrastructure construction,and the urban spatial structure of the Lhasa Metropolitan Area,it is proposed to build a bow-and-arrow-shaped urban system with‘one core,two centers,one axis,and two wings’along the valleys and the transportation trunk lines of the *** study advocates the construction of a pure land industrial system comprising a green cultural and tourism-oriented plateau.

关键词： Lhasa Metropolitan Area spatial scope spatial field energy model development path

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Do swallows(Hirundo daurica)use the visual cue of hatchling down-feathers to discriminate parasite alien nestlings?

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Integrative Zoology 2020年第5期15卷 441-446页

作者： Jiaojiao WANG Qihong li longwu WANG Canchao YANG Wei liANG Ministry of Education Key Laboratory for Ecology of Tropical Islands College of Life SciencesHainan Normal UniversityHaikouChina State Forestry Administration of China Key Laboratory for Biodiversity Conservation in Mountainous Areas of Southwest Karst School of Life SciencesGuizhou Normal UniversityGuiyangChina

Egg recognition is a variable but common anti-parasitism defense among different species of birds with brood *** contrast,nestling recognition is *** few studies have found nestling recognition in brood parasite hosts and determined the rejection mechanism behind this *** may use the number of hatchling downfeathers to reject parasite *** tested whether hatchling down-feathers is a visual cue for the red-rumped swallow,a host that can recognize and reject parasite *** results indicated that red-rumped swallows do not recognize foreign nestlings based on hatchling *** closed nest structure and hatchling morph may explain the absence of such a *** of the rejection mechanisms found in previous studies could explain the nestling recognition in *** cues,tactile cues,or other visual cues,except for single nestling or hatchling down-feathers,may provide nestling recognition in red-rumped *** study is needed to evaluate these possibilities.

关键词： avian brood parasitism egg recognition recognition cue rejection mechani

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Spatiotemporal Differentiation and the Factors Influencing Eco-efficiency in China

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Journal of Resources and Ecology 2021年第2期12卷 155-164页

作者： li Qiuying liANG longwu WANG Zhenbo Institute of Shandong Academy of Social Sciences Jinan 250002China Institute of Geographic Sciences and National Resources Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Economic development,resource utilization,and environmental protection have always presented clear dilemmas for many countries at the national *** is clear that the related concepts of eco-efficiency and the evaluation index can help in evaluating these associated ***,based on the use of undesirable output super Slacks-Based Measure models,this study evaluated the eco-efficiency of 30 Chinese provinces during the period between 2005 and *** evaluation was conducted by analyzing the spatiotemporal dynamics and key factors influencing these changes using a panel regression *** results of this analysis reveal that eco-efficiency gradually increased over the course of the study period,peaking at different levels among the *** used the conventional CV evolutionary method to show that inequalities in eco-efficiency gradually decreased at the national ***,our estimations of the factors affecting this variable suggest that industrial structure,degree of openness,urbanization,technical innovation,and environmental governance all exert significant positive influences,while energy consumption and traffic exert negative *** extent of the impacts of these factors on eco-efficiency varied between the different regions.

关键词： eco-efficiency super-SBM model influencing factors panel regression model

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Cu-catalyzed three-component C–S–P coupling for the synthesis of trisubstituted allenyl phosphorothioates

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Chinese Chemical Letters 2024年第12期35卷 490-493页

作者： Bowen Wang longwu Sun Qianqian Cao Xinzhi li Jianai Chen Shizhao Wang Miaolin Ke Fener Chen Institute of Pharmaceutical Science and Technology Collaborative Innovation Center of Yangtze River Delta Region Green PharmaceuticalsZhejiang University of Technology Engineering Center of Catalysis and Synthesis for Chiral Molecules Department of ChemistryFudan University Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs

A copper-catalyzed three-component reaction involving cyclic carbonates,elemental sulfur,and H-phosphonates is *** proceeds with excellent yields and provides an attractive approach for the construction of valuable trisubstituted allenyl phosphorothioates using a one-step ***,this method can be easily adapted to large-scale preparation.

关键词： Cu-catalyzed Construction of CSP bond Three-component reaction Elemental sulfur Allenyl phosphorothioates

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金催化分子间氧化炔酰胺合成α-氨基酰胺

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有机化学 2015年第3期35卷 655-661页

作者：李龙周波叶龙武固体表面物理化学国家重点实验室福建省化学生物学重点实验室厦门大学化学化工学院厦门361005 固体表面物理化学国家重点实验室福建省化学生物学重点实验室厦门大学化学化工学院厦门361005

α-氨基酰胺作为一类重要的羰基化合物广泛存在于众多天然的和非天然的生物活性分子之中.本工作实现了芳胺NH对在水相体系中通过金催化的分子间氧化炔烃途径产生的α-羰基金卡宾的插入反应.这种通过非重氮方式产生α-羰基金属卡宾的策... 详细信息

α-氨基酰胺作为一类重要的羰基化合物广泛存在于众多天然的和非天然的生物活性分子之中.本工作实现了芳胺NH对在水相体系中通过金催化的分子间氧化炔烃途径产生的α-羰基金卡宾的插入反应.这种通过非重氮方式产生α-羰基金属卡宾的策略为有效合成多种官能团化的α-氨基酰胺化合物提供了一种通用且实用的方法.

关键词：金催化 α-氨基酰胺金卡宾氧化反应

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降水对青藏高原风火山地区多年冻土的影响

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铁道学报 2018年第9期40卷 104-110页

作者：蔡汉成金兰李勇李奋韩龙武中铁西北科学研究院有限公司甘肃兰州730000 青海省冻土与环境工程重点实验室青海格尔木816000

收集了青藏高原多年冻土腹部地区风火山冻土定位观测站观测的1976—2014年的年平均气温、年平均地表温度、年降水量及天然冻土测温孔地温资料,对比分析了年平均气温、年平均地表温度、年降水量及多年冻土地温的变化规律及其之间的相互... 详细信息

收集了青藏高原多年冻土腹部地区风火山冻土定位观测站观测的1976—2014年的年平均气温、年平均地表温度、年降水量及天然冻土测温孔地温资料,对比分析了年平均气温、年平均地表温度、年降水量及多年冻土地温的变化规律及其之间的相互影响关系。结果表明:(1)对于青藏高原风火山地区,寒季降水对多年冻土的保温作用相对较弱,而暖季降水对多年冻土的降温作用相对较强,总体上降水对多年冻土起到了保护作用。(2)在气温和地表温度总体处于升高状态的影响下,青藏高原风火山地区多年冻土地温也在升高,处于退化状态,但降水量的增大降低地表温度,使得传入下部多年冻土的热量减小,从而降低多年冻土地温的升温速率,起到了减缓多年冻土退化的效果。

关键词：降水量年平均气温地表温度多年冻土地温热量传递

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Isolation of T-DNA flanking plant DNA from T-DNAinsertional embryo-lethal mutants of Arabidopsis thaliana by plasmid rescue technique

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Cell Research 1996年第2期6卷 125-136页

作者： YAO XIAO li JIAN GE SUN, ZHI PING ZHU (Chinese National Laboratory of Plant Molecular Genetics,Shanghai Institute of Plant Physiology, Chinese Academy of Sinica, Shanghai 200032, China) (Present address: 1100 longwu Road, Shanghai Botanical Garden, Shang Chinese National Laboratory of Plant Molecular Genetics Shanghai Institute of Plant Physiology Chinese Academy of Sinica Shanghai 200032 China

Three T-DNA insertional embryonic lethal mutants from NASC (The Nottingham Arabidopsis Stock Center)were first checked with their segregation ratio of abortive and normal seeds and the copy number of T-DNA insertion. The N4081 mutant has a segregation ratio of 1:3.04in average and one T-DNA insertion site according to our assay It was therefore chosen for further analysis. To isolate the joint fragment of T-DNA and plan DNA, the plasmid rescue technique waJs used. pEL-7, one of plasmids from left border of T-DNA, which contained pBR322 was selected from ampicillin plate. The T-DNA fragment of pEL-7 was checked by restriction enzyme analysis and Southern Blot. Restriction analysis confirmed the presence of known sites of EcoRI, PstI and PvuII on *** confirming the presence of flanking plant DNA in this plasmid, pEL-7 DNA was labeled and hybridized with wild type and mutant plant DNA. The Southern Blot indicated the hybridization band in both of them. Furthermore, the junction of T-DNA/plant DNA was subcloned into bluescript SK+ and sequenced by Applied Biosystem 373A Sequencer. The results showed the 822 bp fragment contained a 274 bp sequence, which is 99.6%homolog (273bp/274 bp) to Ti plasmid pTi 15955 *** bp of left 25 bp border repeat were also found in the juction of T-DNA and Plant *** together, pEL-7 should contain a joint fragment of T-DNA and flanking plant DNA. This plasmid DNA could be used for the isolation of plant gene, which will be helpful to elucidate the relationship between gene function and plant embryo development.

关键词： Arabidopsis thaliana embryo-lethal mutant plasmid rescue T-DNA insertion flanking plant DNA

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