检索结果-南通市图书馆

Interdisciplinary Materials 2024年第3期3卷 437-447页

作者： Hanwen Zhu Guoqing Tong Junchun Li Xuyong Tao Yang Shen Yuanyuan Sheng Lin Shi fengming xie Jianxin Tang Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefeiPeople's Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhouPeople's Republic of China

Low efficiency and spectral instability caused by the surface defects have been considerable issues for the mixed-halogen blue emitting perovskite quantum dots light-emitting diodes(PeQLEDs).Here,an in situ surface passivation to perovskite quantum dots(PeQDs)is realized by introducing the metal cations competitive lattice occupancy assisted with acid-etching,in which the longchain,insulating and weakly bond surface ligands are removed by addition of octanoic acid(OTAC).Meanwhile,the dissolved A-site cations(Na^(+))compete with the protonated oleyl amine and are subsequently anchored to the surface *** preadded lead bromide,acting as inorganic ligands,demonstrates strong bonding to the uncoordinated surface *** as-synthesized PeQDs show the boosted photoluminescence quantum yield(PLQY)and superior stability with longer *** a result,the PeQLEDs(470 nm)based on the OTAC-Na PeQDs exhibit an external quantum efficiency of 8.42%in the mixed halogen PeQDs(CsPb(Br_(x)Cl_(1−x))_(3)).Moreover,the device exhibits superior spectra stability with negligible *** competition mechanism in combination with in situ passivation strategy paves a new way for improving the performance of blue PeQLEDs.

关键词： acid etching blue PeQLEDs high-efficiency in situ passivation spectral stability

二苯并吡啶并喹喔啉类延迟荧光材料的合成及其电致发光性质

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光学学报 2024年第8期44卷 160-168页

作者：杨耀祖黄飞翔谢凤鸣张强袁国胡英元赵鑫苏州科技大学化学与生命科学学院江苏苏州215009 苏州大学功能纳米与软物质研究院江苏省碳基功能材料与器件重点实验室江苏苏州215123

为获得新颖高效的热激活延迟荧光(TADF)材料,以二苯并吡啶并喹喔啉(BPQ)为受体(A),三苯胺(TPA)、吩噁嗪(PXZ)为供体(D),合成两种TADF材料:BPQPXZ和BPQTPA。研究表明,两种材料都具有典型的延迟荧光特性、较小的单重态与三重态的能级差(Δ... 详细信息

为获得新颖高效的热激活延迟荧光(TADF)材料,以二苯并吡啶并喹喔啉(BPQ)为受体(A),三苯胺(TPA)、吩噁嗪(PXZ)为供体(D),合成两种TADF材料:BPQPXZ和BPQTPA。研究表明,两种材料都具有典型的延迟荧光特性、较小的单重态与三重态的能级差(ΔEST)和较大的振子强度(f)。基于强受体强供体组合的BPQPXZ的器件实现了深红光发射,发射波长达到660 nm,但受能隙的影响,外量子效率(EQE)仅有1.0%。基于强受体弱供体组合的BPQTPA,因其TPA刚性小于PXZ,BPQTPA的供受体扭曲程度小,轨道交盖程度大,f更大,故BPQTPA具有更大的荧光量子产率(82.7%)。同时因TPA的给电子能力比PXZ弱,BPQTPA内电荷转移效应减小,导致发射峰蓝移,因此基于BPQTPA的器件发射555 nm的黄光,与BPQPXZ相比,BPQTPA器件的启亮电压降低至2.8 V,电流效率、功率效率分别提高了32倍和36倍,EQE提升了6倍,达到7.0%。

关键词：材料延迟荧光有机发光二极管二苯并吡啶并喹喔啉电致发光

在线全文

学校读者我要写书评

暂无评论

MMA用量对ABS树脂耐候性能的影响研究

山西化工 2024年第6期44卷 34-35,38页

作者：刘永峰谢丰鸣山东万达化工有限公司山东东营257500

针对耐候丙烯腈-丁二烯-苯乙烯(ABS)树脂制备过程中的甲基丙烯酸甲酯(MMA)用量问题,在不同质量分数下探究了MMA用量对ABS树脂耐候性能的影响差异,从红外光谱分析、色差分析、力学性能与耐热性能等角度进行考察。结果发现,在ABS树脂制备... 详细信息

针对耐候丙烯腈-丁二烯-苯乙烯(ABS)树脂制备过程中的甲基丙烯酸甲酯(MMA)用量问题,在不同质量分数下探究了MMA用量对ABS树脂耐候性能的影响差异,从红外光谱分析、色差分析、力学性能与耐热性能等角度进行考察。结果发现,在ABS树脂制备中加入MMA可以有效提升其耐候性能,且当质量分数为30%时,ABS树脂耐候性能达到最佳状态。

关键词： ABS树脂耐候性能 MMA用量

A Novel Method for Fast Arbitrary-oriented Scene Text Detection

在线全文

学校读者我要写书评

暂无评论

A Novel Method for Fast Arbitrary-oriented Scene Text Detect...

Mass extinctions, their causes and consequences: an interview with Douglas *** and Shuzhong Shen

第30届中国控制与决策会议

作者： Shaohui Ruan Junguo Lu fengming xie Zhongxiao Jin Department of Automation Shanghai Jiao Tong University Shanghai Automotive Industry Corporation

In this paper, we propose a novel method for fast arbitrary-oriented text detection in scene images. Our proposed method is simple and effective which can predict word-level bounding boxes via a single fully convolutional network. Our method extracts features from the input images by residual network and apply multi-level fusion over the extracted features. It has two outputs, pixel-wise classification between text and non-text and word-level bounding boxes. Our method achieves an F-measure of 83.46% and 56.39% on ICDAR2015 Incidental Scene Text benchmark and COCO-Text dataset respectively, outperforming the previous methods by a large margin. Also, it can run at over 11 FPS on 704 × 1280 images, which is much faster than the previous works.

关键词： Scene Text Detection Fully Convolutional Network Residual Network Multi-task Learning

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

National Science Review 2024年第1期11卷 66-70页

作者： Shucheng xie State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences at Wuhan

‘Mass extinctions’ have been a hot topic for several decades. What triggers a mass extinction? How does a mass extinction impact the evolution of life? How does our ecosystem recover after a mass extinction? These questions attracted the interest of both scientists and the public *** spoke to two renowned researchers in the field of mass extinctions: Prof. Douglas H. Erwin from the National Museum of Natural History of the USA, and Prof. Shuzhong Shen from Nanjing University, China.

关键词： Stratigraphy

双苯磺酰基苯类延迟荧光材料的合成及电致发光性质

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

材料导报 2023年第4期37卷 211-215页

作者：王达浩谢凤鸣魏怀鑫胡英元赵鑫苏州科技大学化学与生命科学学院江苏苏州215009 苏州大学功能纳米与软物质研究院江苏省碳基功能材料与器件重点实验室江苏苏州215123

以1,3-双(苯磺酰基)苯为受体基团(A)、二苯胺和吩噁嗪分别为供体基团(D),设计合成了两种具有扭曲D-A-D结构的热激活延迟荧光(TADF)材料:1,3-双(3-二苯氨基苯磺酰基)苯(PSPA)和1,3-双(3-吩噁嗪-10-基苯磺酰基)苯(PSPP)。在1,3-双(苯磺酰... 详细信息

以1,3-双(苯磺酰基)苯为受体基团(A)、二苯胺和吩噁嗪分别为供体基团(D),设计合成了两种具有扭曲D-A-D结构的热激活延迟荧光(TADF)材料:1,3-双(3-二苯氨基苯磺酰基)苯(PSPA)和1,3-双(3-吩噁嗪-10-基苯磺酰基)苯(PSPP)。在1,3-双(苯磺酰基)苯的3,3′-位连接供体基团,使供体和受体之间有较大的扭曲角,实现了最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)的有限重叠,获得了较小的ΔE ST(分别为0.21 eV和0.016 eV)和较好的光致发光量子产率(PLQYs,分别为4.36%和37.36%)。瞬态荧光谱表明,PSPA和PSPP都具有典型的延迟荧光特性。基于PSPA的器件呈现蓝光发射(450 nm);基于PSPP的器件因吩噁嗪的强给电子能力,在520 nm处发射绿光,发射峰红移,且其最大外量子效率大于PSPA,达到4.48%。

关键词：热激活延迟荧光有机发光二极管双(苯磺酰基)苯电致发光性质

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN Feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

基于三苯基-1,3,5-均三嗪的星形双极性蓝色磷光主体材料的合成及性质

在线全文

学校读者我要写书评

暂无评论

材料导报 2019年第24期33卷 4170-4173,4192页

作者：谢凤鸣魏怀鑫张强周家宏赵鑫苏州科技大学化学生物与材料工程学院苏州215009 江苏省环境功能材料重点实验室苏州215009

本工作设计、合成了两种基于三苯基-1,3,5-均三嗪的星形双极性蓝色磷光主体材料:((6-(3-(9-乙基-9H-咔唑-3-基)苯基)-1,3,5-三嗪-2,4-二基)双(3-苯基))双(二苯基氧化膦)(CzPTBPO)和(3-(4,6-二(3-(9-乙基-9H-咔唑-3-基)苯基)-1,3,5-三嗪-2-基)苯基)二苯基氧化膦(BCzPTPO)。CzPTBPO和BCzPTPO的荧光发射峰分别位于410nm和424nm处,属于深蓝色荧光;由低温磷光的第一发射峰计算得到它们的三线态能级(ET)分别为2.75eV和2.68eV,与蓝色磷光客体材料FIrpic(2.65eV)的能级相匹配;由循环伏安测试计算得到它们的HOMO能级分别为-5.68eV和-5.62eV,与阳极ITO的功函(-4.5^-5.0eV)相匹配,其LUMO能级分别为-2.42eV和-2.44eV,可与多数的电子传输材料匹配(如:TPBi为-2.70eV),且HOMO与LUMO轨道几乎没有重叠,表明其具有良好的空穴注入和电子传输的双极性质;TG显示两种材料的分解温度(5%质量损失)分别为398℃和387℃,表明其热稳定性非常好;DSC显示其玻璃化温度分别为148℃和134℃,表明其具有无定形态结构及良好的成膜性。因此,CzPTBPO和BCzPTPO有望作为双极性蓝色磷光主体材料应用于磷光有机发光二极管(PhOLEDs)。

关键词：磷光主体材料双极性三苯基-1,3,5-均三嗪蓝色磷光磷光有机发光二极管

Output feedback stabilization of stochastic high-order planar nonlinear systems with stochastic inverse dynamics and output-constraint

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第3期67卷 182-196页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this paper, we solve the output feedback control problem of stochastic high-order planar nonlinear systems with output constraint and stochastic integral input-to-state stability(SiISS) inverse dynamics. By employing a key coordinate transformation, a stochastic nonlinear system with output constraint and SiISS inverse dynamics is converted into an unconstrained system. By skillfully constructing an observer and adopting SiISS small-gain conditions, we develop a new output feedback control design and analysis method, and prove that all the closed-system signals are bounded almost surely, the output constraint is not violated almost surely, and the equilibrium point of the closed-loop system is stochastically asymptotically stable.

关键词： stochastic high-order planar nonlinear system outputconstraint stochastic inverse dynamics output feedbackstabilization stochastic integral input-to-state stability(SiISS)

Fixed-time stabilization of output-constrained stochastic high-order nonlinear systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第4期67卷 5-20页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this study, the fixed-time stabilization problem of stochastic high-order nonlinear systems with output constraint and high-order and low-order nonlinearities is addressed. A new coordinate transformation is employed to directly convert output-constrained stochastic systems into an equivalent unconstrained *** fully extracting the characteristics of system nonlinearities and using the stochastic fixed-time stability theorem, a new design and analysis method is constructed to guarantee that the trivial solution of the closed-loop system is stochastically fixed-time stable while fulfilling the output constraint.

关键词： stochastic high-order nonlinear system outputconstraint high-order and low-order nonlinearity fixed-timestabilization finite-time stabilization