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FAST NEUTRON RADIATIVE CAPTURE CROSS SECTIONS OF NATURAL NIOBIUM AND MOLYBDENUM

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中国核科技报告 1990年第S2期 14-15页

作者： MuYunshan XuHaishan XiangZhengyu Li Yexiang Wang Shiming(INSTITUTE OF NUCLEAR SCIENCE AND TECHNOLOGY, SICHUAN UNIVERSITY)liu Jianfeng (physics {2., zhengzhou UNIVERSITY)

The neutron radiative capture cross sections of natural niobium andmolybdenum were measured relatively to that of gold at four neutron energypoints between 0.7 and 1.4 MeV,using a large liquid scintillation detector andthe time-of-flight *** proton beam,with a repetition frequencyof 2.MHz,width of 10 ns and average intensity of 2.to 4 μA,was provided from2.5 MeV Van de Graaff accelerator,and pulsed monoenergetic neutron wasgenerated by T(p,n)*** resulting total error for measurements isabout from 10～12..

关键词： FAST NEUTRON RADIATIVE CAPTURE CROSS SECTIONS OF NATURAL NIOBIUM AND MOLYBDENUM work

Oxygen vacancy promoting artificial atom(RuPd)by d-orbital coupling for efficient water dissociation

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Nano Research 2024年第8期17卷 7045-7052页

作者： Ruofan Shen Yanyan liu Shuling liu Shuyan Guan Huanhuan Zhang Sehrish Mehdi Saima Ashraf Ting-Hui Xiao Erjun Liang Jianchun Jiang Yongfeng Wang Baojun Li Laboratory of Zhongyuan Light School of PhysicsZhengzhou UniversityZhengzhou 450001China Key Laboratory of Materials physics Ministry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450001China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of Science Henan Agricultural UniversityZhengzhou 450002China department of Chemistry Tsinghua UniversityBeijing 100084China National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsCAFNanjing 210042China Center for Carbon-based Electronics and Key Laboratory for the physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

Rational design of highly active catalysts for breaking hydrogen-oxygen bonds is of great significance in energy chemical reactions involving ***,an efficient strategy for the artificial atom(RuPd)established by d-orbital coupling and adjusted by oxygen vacancy(V_(O))is verified for water *** an experimental verification,the turnover frequency of RuPd-TiO_(2.-VO(RuPdTVO)catalyst in ammonia borane hydrolysis reaches up to 2.50 min^(−1)(2.,190 min−1 based on metal dispersion)in the absence of alkali,exceeding the highest active catalysts(Rh-based catalysts).The d-orbital coupling effect between Ru and Pd simulates the outer electronic structure of *** transfer from V_(O) to(RuPd)constructs an electron-rich state of active sites that further enhances the ability of the artificial atom to dissociate *** work provides an effective electronic regulation strategy from V_(O) and artificial atom constructed by d-orbital coupling effect for efficient water dissociation.

关键词： ammonia borane hydrolysis d-orbital coupling oxygen vacancy artificial atom water dissociation

A Stable Red Emission in Polymer Light-Emitting Diodes based on Phenothiazine Derivative

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A Stable Red Emission in Polymer Light-Emitting Diodes based...

Bio-inspired barnacle cement coating of biodegradable magnesium alloy for cerebrovascular application

2.07亚洲光电子会议LED材料与器件分会场

作者： Huayu Cao a Zhijian Chen a Yingliang liu a Jianghui Li b Shaokui Cao b Lixin Xiao a Shengang Xu b Qihuang Gong a a State Key Laboratory for Artificial Microstructures & Mesoscopic physics {2. of physics Peking University Beijing 100871 PR china b School of Materials Science & Engineering zhengzhou University zhengzhou 450052.PR china

A novel soluble phenothiazine-based derivative, poly（3, 7-divinylene-N-octyl-phenothiazine 2. 3-diethylquinoxaline-5,8-diyl）（PQDN）, is synthesized for application in red light-emitting diodes. PQDN was characterized by the measurements of cyclic voltammetry （CV）, absorption and photoluminescence （PL） spectra. The band gap （Eg） was determined to be 1.89 eV. The smaller band gap suggested that the polymer is a good candidate for red electroluminescent materials. Polymer light-emitting diodes （PLEDs） with double-layer configuration of indium tin oxide （ITO） / （poly-ethylenedioxythiophene）:poly（styrene sulfonate）（PEDOT:PSS） / PQDN: poly（N-vinylcarbazole）（PVK）（100:0, 80:2., 60:40, and 2.:80 wt.%） / Mg:Ag were fabricated. The electroluminescent （EL） property was studied in details. In order to improve the EL performance further, the devices were thermally annealed at 100oC for one hour under the protection of nitrogen. Luminance is increased obviously. EL peak wavelength and the Commision International de L’Eclairage （CIE） coordinates are unaltered and located in red region with the increase of the operating voltages,.

关键词： Phenothiazine red emission electroluminescence

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Rare Metals 2024年第10期43卷 5164-5185页

作者： Hang Li Fei Wang Xiao-Jing Sun liu-Jie Qi Jing-An Li Mujahid Iqbal Shao-Kang Guan School of Material Science and Engineering Zhengzhou University Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of Materials Processing and Mold (Ministry of Education) Zhengzhou University department of physics University of Agriculture Faisalabad

Ischemic stroke is increasing worldwide, and stent intervention has gradually become one of the effective treatments. Owing to its good mechanical properties and biocompatibility, biodegradable Mg-Zn-Y-Nd alloy(ZE2.B) has good application prospects in vascular ***, too fast degradation and delayed endothelialization are the bottleneck problem to limit its further application. In this study, the bio-inspired coating barnacle cement cp19k is constructed on ZE2.B surface through electrostatic spraying to improve the corrosion resistance and pro-endothelialization ability. The coating was evaluated through electrochemistry, static immersion corrosion,in vitro blood experiments and cell experiments. Cp19k effectively improved the corrosion resistance of the substrate ZE2.B, reduced the degradation rate, improved endothelial cell proliferation and migration capabilities,inhibited smooth muscle cells proliferation and regulated contractile phenotype, inhibited macrophage adhesion,regulated macrophage M2.phenotype, and reduced the expression of inflammatory factor of TNF-a and inhibited fibroplasia in vivo. Our data indicated that the barnacle cement cp19k coating had potential application on the surface modification of Mg alloy cerebrovascular stent.

关键词： Barnacle cement cp19k Biodegradable magnesium alloy Cerebrovascular stent M2.phenotype Pro-endothelialization

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多声子强耦合超导理论

物理学报 1989年第1期38卷 53-59页

作者：范希庆刘砚章王淮生刘福绥郑州大学物理系北京大学物理系

本文提出了多声子过程的强耦合超导理论,给出了能隙方程和T_c公式。结果发现,考虑电子多声子过程,高频声子对提高T_c有重要作用,单胞中对超导贡献的简并度数大,也有利于高T_c的出现。

关键词：声子耦合超导性

Ultra-high current gain tunneling hot-electron transfer amplifier based on vertical van der Waals heterojunctions

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Nano Research 2020年第8期13卷 2085-2090页

作者： Xu Zhao Peng Chen Xingqiang liu guoli Li Xuming Zou Yuan liu Qilong Wu Yufang liu Woo Jong Yu Lei Liao Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural physics and Devices School of Physics and ElectronicsChangsha410082China Henan Normal University School of PhysicsXinxiang453007China department of Electronic and Electrical Engineering Sungkyunkwan UniversitySuwon440-746Republic of Korea

Due to the backscattered parasitic current from the barriers,the current gain of the widely used amplifier is far from *** this work,we demonstrate a vertical Au/Al2.3/BP/MoS2.tunneling hot-electron transfer amplifier with a hot-electron emitter-base junction and a p-n junction as the base-collector *** monoenergetic electrons traverse through the ultrathin Al2.3 dielectric via tunneling,which are accelerated and shifted to the collector *** devices exhibit a high current on-off ratio of>105 and a high current density(JC)of∼1,000 A/cm2.at the same ***,this work demonstrates a common-emitter current gain(β)value of 1,384 with a nanowatt power consumption at room temperature,which is a record high value among the all 2. based hot-electron ***,the temperature dependent performance is investigated,and theβvalue of 1,613 is obtained at 150 ***,this work presents the potential of 2. based transistors for high-performance applications.

关键词： bipolar junction transistor hot electron van der Waals heterostructure current gain

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铂铑-铂温差电偶的精确测温及不确定度评定

物理实验 2002年第8期22卷 3-5页

作者：陈镇平刘海增薛运才郑州轻工业学院应用数理系郑州450002

介绍了利用电势差计对铂铑 -铂温差电偶测温计精确标定的方法 .通过对测量结果的不确定度评定 ,给出利用该方法所测温度的不确定度为 0 .5℃ .

关键词：不确定度评定铂铑-铂温差电偶温度电动势测量精度

Theoretical study of superradiant masing with solid-state spins at room temperature

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Science china(physics,Mechanics & Astronomy) 2024年第6期67卷 38-47页

作者： Qilong Wu Yuan Zhang Hao Wu Shi-Lei Su Kai-Kai liu Mark Oxborrow Chong-Xin Shan Klaus Mølmer Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Institute of Quantum Materials and physics Henan Academy of SciencesZhengzhou 450046China Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academy of Quantum Information Sciences Beijing 100193China department of Materials Imperial College LondonLondon SW72AZUK Niels Bohr Institute University of CopenhagenCopenhagen 2100Denmark

Steady-state superradiance and superradiant lasing attract significant attentions in the field of optical lattice clocks,but have not been achieved yet due to the technical challenges and atom loss *** this article,we propose that their counter-part may be observed in the microwave domain with solid-state spins,i.e.,nitrogen-vacancy center spins and pentacene molecular spins,coupled to microwave resonator at room temperature with realistic technical *** validate our proposal,we investigate systematically the system dynamics and steady-state by solving quantum master equations for the multi-level and multi-process dynamics of trillions of *** calculations show that the superradiant Rabi oscillations occur firstly due to transitions among different Dicke states,and the subsequent continuous-wave superradiant masing can achieve a linewidth well below *** work may guide further exploration of transient and steady-state superradiant masing with the mentioned and other solid-state spins *** ultra-narrow linewidth may find applications in deep-space communications,radio astronomy and high-precision metrology.

关键词： solid-state spins superradiance maser

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电子多声子作用对散射时间的效应

物理学报 1989年第1期38卷 154-158页

作者：刘福绥范希庆刘砚章王淮生阮英超北京大学物理系郑州大学物理系黑龙江大学物理系

本文给出电子多声子作用对电子寿命影响的一般讨论方法,同时给出温度T德拜温度T_D的表达式,指出YBaCuO体系中电子多声子作用对高温超导性可能是重要的。

关键词：电子多声子散射