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Axial enantiomers with donor-regulated TADF feature for multicolor circularly polarized electroluminescence

Science China Chemistry 2024年第6期67卷 2039-2045页

作者： Chen-Hao Guo wen-Long zhao ke-ke Tan Wei-Chen Guo Liheng Feng Chuan-Feng Chen Meng Li School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan030006China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Recognition and FunctionInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

This study optimized the TADF feature of axial chiral enantiomers through precise donor engineering,and multicolor CP-TADFwas achieved in the axial chiral *** pairs of axial enantiomers with donor-regulated TADF feature,namely(R/S)-TPCBD,(R/S)-DPCBD,and(R/S)-DPACBD,were synthesized by introducing carbazole donors with different substituents onto biphenyl cyanide *** the electron-donating ability of donors increases,the emission of these axial enantiomers ranges from 455,476 to 552 nm,their singlet-triplet energy gaps(ΔE_(ST))gradually decrease from 0.30,0.22 to 0.02 e V,accompanied by an increasement in the transition rate(k_(RISC))of RISC process,and the k_(RISC)of DPACBD could reach up to 7.16×10^(5)s^(-1).These axial enantiomers also exhibit mirror-image CD and circularly polarized luminescence(CPL)***,OLEDs based on TPCBD,DPCBD,and DPACBD as emitter were then fabricated,which displayed blue,green,and orange electroluminescence with EQE_(max)of 13.0%,16.4%,and 25.0%,*** results also exhibited a phenomenon of device efficiency increasing with the enhancement of donor ***,the CP-OLEDs using(R/S)-TPCBD,(R/S)-DPCBD and(R/S)-DPACBD as emitters displayed intense CPEL signals with g_(EL)values of 3.4×10^(-3)/-4.1×10^(-3),3.2×10^(-3)/-3.1×10^(-3)and2.3×10^(-3)/-2.1×10^(-3),*** convenient molecular engineering of donor regulation in the same molecular skeleton,CP-TADF materials with multicolor CPEL and improved device performance could be conveniently achieved.

关键词： axial chirality thermally activated delayed fluorescence circularly polarized luminescence electroluminescence organic light-emitting diodes

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Microstructural control and hardening response of Mg–6Zn–0.5Er–0.5Ca alloy

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Rare Metals 2016年第7期35卷 526-531页

作者： Xiao-Bing Zheng ke Liu zhao-Hui Wang Shu-Bo Li wen-Bo Du School of Material Science and Engineering Beijing University of Technology

The effects of heat treatment on microstructures and hardening response of Mg-6Zn4）.5Er4）.5Ca （wt%） alloy were investigated by optical microscope （OM）, scanning elec- tron microscope （SEM）, and transmission electron microscope （TEM） in this paper. The results show that the Mg（Zn4）.5Er- 0.5Ca alloy contains Mg3Zn6Erx quasicrystalline phase （I- phase） and Ca2Mg6Zn3 phase under as-cast condition. Most of the Ca2Mg6Zn3 phases and I-phases dissolve into matrix during heat treatment at 475 ℃ for 5 h. After the as-solution alloy was aged at 175 ℃ for 36 h, a large amount of MgZn2 precipitate with several nanometers precipitate. It is suggested that the trace addition of Ca results in refining the size of the precipitate, and the presence of the nanoscale MgZn2 phase is the main factor to improve the peak-aged hardness greatly to 87 HV, which in- creases about 40 % compared with that of as-cast alloy.

关键词： Mg-6Zn-0.5Er-0.5Ca alloy Heat treatment Aging hardening

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Microstructure and mechanical properties of AZ31 magnesium alloy reinforced by I-phase

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Rare Metals 2019年第8期38卷 733-738页

作者： Hai-Rong Wu wen-Bo Du Shu-Bo Li ke Liu zhao-Hui Wang School of Materials Science and Engineering Beijing University of Technology

The particles of Mg-Zn-Gd icosahedral quasicrystal master alloy were added into the AZ31 alloy by the repeated plastic working(RPW)process in order to improve the mechanical properties of the AZ31 alloy at room *** microstructure and tensile properties of composites were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and tensile testing machine at room *** results suggest that the RPW process can effectively refine the matrix and make the I-phase particles distribute *** ultimate tensile strength and the yield strength of the composites reach their maximum values of 362.3 and 330.5 MPa,respectively,when the amount of I-phase particles added is10 %.Meanwhile,the elongation of the composites decreases sharply.

关键词： I-phase Reinforced composite Repeated plastic working Mechanical property

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Dual-labeled visual tracer system for topical drug delivery by nanoparticle-triggered P-glycoprotein silencing

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Chinese Chemical Letters 2021年第12期32卷 3954-3961页

作者： Jushan Gao Shanbo Ma Xinxin zhao Jinpeng wen Datao Hu Xiaoye zhao Xiaopeng Shi ke Wang School of Pharmacy Health Science CenterXi'an Jiaotong UniversityXi'an 710061China Department of Pharmacy Xijing HospitalFourth Military Medical UniversityXi'an 710032China

Using nanoparticle-based drug delivery systems as enhancers is a robust strategy for transdermal delivery;however, the mechanisms by which these systems promote transdermal penetration are still ***, we fabricated a dual-labeled nano drug delivery system that allows discrete visualization of both the drug and the nanoparticle carrier. To comprehensively examine its potential mechanism, we investigated its effects on human epidermal keratinocyte Ha Ca T cells, including changes in cell membrane potential, intracellular Ca;concentration, and Ca;-ATPase activity. P-glycoprotein(P-gp) expression in nanoparticle-treated human dermal microvascular endothelial cells was detected by western blotting and immunofluorescence. Furthermore, the transdermal absorption and biodistribution of the dual-labeled nanoparticles were deeply investigated by skin permeability study in vitro and in vivo using fluorescence microscopy and in vivo imaging, respectively. In addition to reducing membrane potential, increasing the intracellular Ca;concentration, and decreasing Ca;-ATPase activity, our results indicate that the duallabeled nanoparticles can downregulate P-gp to promote transdermal absorption. Fluorescence and in vivo imaging visually demonstrated that the nanoparticle delivery system penetrated into the dermis through the stratum corneum. All these results indicate that this dual-labeled nano delivery system provides a new method for future in-depth visual explorations of transdermal drug delivery mechanisms.

关键词： Transdermal delivery Nanoparticle Stratum corneum Dermis Transdermal enhancer

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面向微型植物工厂的太阳能自动追光系统设计

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科技创新与生产力 2018年第3期 56-60页

作者：赵晴贾鹤鸣刘丹丹罗孟德蒋宗祥赵文科东北林业大学机电工程学院黑龙江哈尔滨150040 东北林业大学交通学院黑龙江哈尔滨150040

为了高效地采集并利用太阳能,笔者设计了一种可用于微型植物工厂的太阳能追光实物装置及其系统,从机械设计、硬件电路设计和太阳能自动追光算法设计3个方面,介绍了太阳能自动追光系统的硬件与软件构成,阐述了太阳能自动追光系统的工作... 详细信息

为了高效地采集并利用太阳能,笔者设计了一种可用于微型植物工厂的太阳能追光实物装置及其系统,从机械设计、硬件电路设计和太阳能自动追光算法设计3个方面,介绍了太阳能自动追光系统的硬件与软件构成,阐述了太阳能自动追光系统的工作流程和软件流程,确定了太阳能自动追光算法设计方案,设计了光照强度测量电路、电源管理系统稳压电路、双轴直流电机驱动系统电路等太阳能自动追光系统的硬件电路,指出该系统实现了双轴直流电机的闭环控制,大大提高了自动追光精度和效率,充分开发和利用太阳能对解决能源问题有着十分重要的战略意义。

关键词：自动控制植物工厂自动追光太阳能存储双轴跟踪控制

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Diffuse Interstellar Bandsλ6379,λ6614,andλ6660 in the LAMOST-MRS Spectra

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Research in Astronomy and Astrophysics 2022年第8期22卷 85-102页

作者： ke-Fei Wu A-Li Luo Jian-Jun Chen wen Hou Yong-Heng zhao CAS key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China School of Information Management&Institute for Astronomical Science Dezhou UniversityDezhou 253023China

Diffuse interstellar bands(DIBs)have always been a mysterious existence in astronomical *** this work,we provide more DIB samples to slightly uncover this *** the LAMOST medium-resolution survey(MRS)spectra,we detected three DIBsλ6379,λ6614,andλ6660,obviously superimposed on the spectra of11,003 *** spectra cover spectral types from O to K,which can provide a large number of candidates for further research on *** sample shows a clear positive correlation between the strength of DIBs and extinction,which agrees with the result in the *** addition,there exist two peaks in each of the velocity distribution of these three DIBs,and the velocity differences between two peaks of each pair are *** reason for the two velocity components is due to the Galactic rotation.

关键词： ISM:molecules methods:data analysis (ISM:)dust extinction

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二划分推广的子集系上界的简单证明

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河南大学学报（自然科学版） 2000年第2期30卷 56-56页

作者：赵克文琼州大学数学系海南省通什市572200

1 引言和定理S表示n元集合.如果S1∪S2∪S3=S且有Si∩Sj=ф(1≤i≠j≤3),则称S1、S2、S3为S的一个三划分.Kleitman和katona分别在文[1]和[2]中得到:引理:S是n元集合,让S1、S2是S的二划分,又设是S的一子集系,使无A、B∈满足下述条件之一:... 详细信息

1 引言和定理S表示n元集合.如果S1∪S2∪S3=S且有Si∩Sj=ф(1≤i≠j≤3),则称S1、S2、S3为S的一个三划分.Kleitman和katona分别在文[1]和[2]中得到:引理:S是n元集合,让S1、S2是S的二划分,又设是S的一子集系,使无A、B∈满足下述条件之一:(1)A∩S1=B∩S1,且A∩S2B∩S2,;(2)A∩S1B∩S1,且A∩S2=B∩S2.

关键词：二划分子集系上界集合

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视觉语法视角下南京旅游英文官网多模态话语分析

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佳木斯大学社会科学学报 2025年第1期43卷 142-146页

作者：赵文彩铜陵学院安徽铜陵244000

以Gunther Kress和Theo van Leeuwen的视觉语法理论为分析框架,通过对南京旅游英文官网的案例研究,分析旅游网站多模态话语的再现意义、互动意义和构图意义。研究发现,南京旅游英文网站使用大量图片视觉符号资源构建意义,图片符号与文... 详细信息

以Gunther Kress和Theo van Leeuwen的视觉语法理论为分析框架,通过对南京旅游英文官网的案例研究,分析旅游网站多模态话语的再现意义、互动意义和构图意义。研究发现,南京旅游英文网站使用大量图片视觉符号资源构建意义,图片符号与文字符号协同作用,对观看者产生视觉上的冲击,达到良好的宣传效果。不足之处在于,叙事再现图片占比较低,人物参与者缺乏与观看者的正面接触,图片设计者多采用中、远镜头,虽客观呈现景物特点,但与观看者保持较为疏远的关系。建议网站丰富再现意义的类型,增加叙事再现的使用,增加参与者与观看者的正面接触;适当采取前景化、分割线等手段,借用近距离镜头将观看者代入到图片情境中。

关键词：视觉语法南京旅游英文官网多模态话语分析

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西欧交通印象

引用

城市公共交通 2005年第10期 39-39页

作者：赵文科内蒙古高等级公路建设开发有限责任公司

西欧的交通,四通八达、文明有序,凸现"以人为本"的理念,让我们考察团一行领悟了高度物质发达中孕育的管理文明.

关键词：交通西欧印象以人为本考察团文明

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Hot Dust Acoustic Solitary Waves in Dust Plasma with Variable Dust Charge

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Chinese Physics Letters 2001年第8期18卷 1088-1089页

作者： DUAN wen-Shan LÜ ke-Pu zhao Jin-Bao Department of Physics Northwest Normal UniversityLanzhou 730070

Considering the variation of dust charges,We have analytically studied the governing equation for the system with the same model as that for cold dust acoustic waves in a demagnetized plasma but the contribution of hot *** result indicates that the governing equation is also a Korteweg-de Vries equaiton,although its amplitude and width will be smaller compared with the cold dust case.

关键词： equation governing charges

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