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Development of RF windows for 650 MHz multibeam klystron

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Nuclear Science and Techniques 2023年第9期34卷 58-68页

作者： sheng-chang Wang Zu-sheng Zhou Zhi-Jun Lu Zhi-Qing Liu Shigeki Fukuda Yu Liu Jing-Yi Li Wei-Ming Li National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Kunshan Guo Li Electronic Technology Co. Ltd.Kunshan 215300China High Energy Accelerator Research Organization KEK 1-1 OhoTsukubaIbaraki 305-0801Japan

Radio frequency windows are developed and evaluated for a 650 MHz continuous-wave multibeam ***-pillbox windows with alumina and beryllia disks are designed with an average RF power of CW 400 *** of a cold test and tuning procedures are *** final measured S11 curves under the required bandwidth are less than-32.0 and-26.9 dB for alumina and beryllia windows,*** windows are tested up to CW 143 kW for traveling waves and CW 110 kW for standing waves using a solid-state amplifier as an RF power *** simulations for windows and benchmark studies for the thermal analysis of ceramic disks are introduced.

关键词： RF window High-power test MBK

An efficient route for synthesis of 2-alkylamino benzo[b]thieno[3,2-d]pyrimidin-4(3H)-one

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Chinese Chemical Letters 2011年第4期22卷 443-446页

作者： Min Hui Cao sheng Zhen Xu chang Shui Chen College of Basic Science Huazhong Agricultural UniversityWuhan 430070China

The carbodiimide 2,obtained from the aza-Wittig reactions of iminophosphorane 1 with alkyl isocyanates,reacted with primary amino to give 2-alkylamino benzo[b]thieno[3,2-d]pyrimidin-4（3H）-ones 4 and *** formation me... 详细信息

关键词： Carbodiimides Aza-Wittig reaction Iminophosphorane Isocyanates Synthesis

Resonance Light Scattering Spectra of Silver Thiocyanate System and its Application in Analysis

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Chinese Chemical Letters 2005年第8期16卷 1063-1066页

作者： chang Yin LU Zhi Hui HAN sheng Yuan YANG School of Chemistry and Chemical Engineering Nanhua University School of Public Health Nanhua UniversityHengyang 421001 Institute of Labour Hygiene and Occupational Diseases of Human Province Changsha 410007

A novel determination method of Ag^＋ was established. In acetic acid-sodium acetate buffer （pH 5.0） medium, Ag^＋ reacts with SCN^- to form AgSCN in the presence of TritonX-100,which results in an increase of resonance light scattering （RLS）and giving a new RLS *** maximum RLS peak was at 585 nm,The enhancement of resonance light scattering at 585 nm was proportional to the concentration of Ag^＋ ranging from 0.0045-4.00μg mL^-1 （r=9991）,and the detection limit was 1.37 ng mL^-1 with the recovery of 97.70%- 104.80%。

关键词： Resonance light scattering silver silver thiocyanate.

Photocatalytic degradation of Acid Blue 62 over CuO-SnO_2 nanocomposite photocatalyst under simulated sunlight

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Journal of Environmental Sciences 2007年第9期19卷 1141-1145页

作者： XIA Hui-li ZHUANG Hui-sheng ZHANG Tao XIAO Dong-chang College of Environmental Science and Engineering Donghua University Shanghai 201620 China.

The novel CuO-SnO2 nanocomposite oxide photocatalysts were prepared by simple co-precipitation method, and characterized by X- ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of CuO-SnO2, evaluated using the photodegradation of Acid Blue 62 as a probe reaction under the irradiation of Xenon light, were also found to be related to the calcination temperature and the molar ratio of Cu to Sn. The maximum photocatalytic activity of the CuO-SnO2 photocatalyst was observed to be calcined at 500~C for 3 h （the molar ratio of Cu to Sn was 1：1） due to the sample with good crystallization and high surface area. It also showed much higher photocatalytic activity in treatment dye wastewater under simulated sunlight irradiation compared to Degussa P25 TiO2.

关键词： photocatalysis copper oxide tin dioxide Acid Blue 62 (AB62) simulated sunlight

A novel multiscale simulation framework for low-dimensional memristors

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Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 79-87页

作者： Shurong Pan Li Liu Qijun Huang Jin He Hao Wang sheng chang Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China School of Microelectronics Wuhan UniversityWuhan 430072China

In recent years,the memristor has been widely considered an emerging device,but it has rarely been *** obstacle is the change in the intrinsic atomic level when it *** the density functional theory(DFT),this atomic level change in structure cannot be *** molecular dynamics(MD),memristor electronic transport properties cannot be *** this study,we propose a novel multiscale simulation framework merging MD,DFT,and the nonequilibrium Green’s function method,which can reveal not only a memristor’s basic working mechanism but also its transport *** verify our framework’s availability in guiding innovative memristor design,a new type of memristor,a planar monolayer MoS_(2)-based memristor,is simulated for the first *** popped S atoms’effect on its carrier transport is revealed,which clarifies the working mechanism of the planar monolayer MoS_(2)-based memory *** hope that this framework can shed light on the analysis and design of low-dimensional memristors.

关键词： multiscale framework memristor planar monolayer transport properties MoS_(2)

Machine learning method for tight-binding Hamiltonian parameterization from ab-initio band structure

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npj Computational Materials 2021年第1期7卷 79-88页

作者： Zifeng Wang Shizhuo Ye Hao Wang Jin He Qijun Huang sheng chang Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and School of Physics and Technology Wuhan University430072 WuhanHubeiPeople’s Republic of China

The tight-binding(TB)method is an ideal candidate for determining electronic and transport properties for a large-scale *** describes the system as real-space Hamiltonian matrices expressed on a manageable number of parameters,leading to substantially lower computational costs than the ab-initio *** the whole system is defined by the parameterization scheme,the choice of the TB parameters decides the reliability of the TB *** typical empirical TB method uses the TB parameters directly from the existing parameter sets,which hardly reproduces the desired electronic structures quantitatively without specific *** is thus not suitable for quantitative studies like the transport property *** ab-initio TB method derives the TB parameters from the ab-initio results through the transformation of basis functions,which achieves much higher numerical ***,it assumes prior knowledge of the basis and may encompass truncation ***,a machine learning method for TB Hamiltonian parameterization is proposed,within which a neural network(NN)is introduced with its neurons acting as the TB matrix *** method can construct the empirical TB model that reproduces the given ab-initio energy bands with predefined accuracy,which provides a fast and convenient way for TB model construction and gives insights into machine learning applications in physical problems.

关键词： Hamiltonian system assume

Effect of Ball Scribing on Magnetic Shielding Efficiency of Grain-oriented Silicon Steel

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Journal of Iron and Steel Research International 2014年第7期21卷 679-684页

作者： Hao WANG chang-sheng LI Rui-bin MEI Gang HUO State Key Laboratory of Rolling and Automation Northeastern University Northeastern University at Qinhuangdao Branch Northeastern University Benxi Steel Posco Cold Strip Rolling Co. Ltd.

Magnetic shielding of grain-oriented silicon steel was investigated. Ball scribing with spacing of 2 to 16 mm was performed at peak flux densities of 8.0 mT to 1.3 T. Magnetic shielding efficiency was calculated, including absorption, reflection and inner multi-reflection shielding efficiencies. Magnetic shielding efficiency （MSE） increase ratios after different scribing spacing were compared, and thickness requirement to achieve absorption shielding of 50 dB was also calculated. The results show that magnetic shielding efficiencies of C711 and H668 silicon steels increase by 4.79 and 3.15 dB respectively after scribing of 16 mm. Before scribing, shielding efficiency of H668 steel was higher than that of C711 steel, while after scribing, both absorption and shielding efficiency gaps were largely abridged between C711 and H668 steels. Plate thickness of C711 steel could be reduced from 3.18 mm without scribing to 2. 20 mm after scribing of 16 mm. There is no apparent thickness reduction at lower flux densities; while the peak flux density is above 0.3 T, the shielding effect becomes apparent, and the thickness could be reduced from 2.28 mm without scribing to 1.70 mm with scribing spacing of 16 ram. Magnetizing process and its effect on variation of magnetic shielding were also analyzed.

关键词： magnetic shielding efficiency grain-oriented silicon steel absorption shielding reflection shielding inner multi-reflection shielding thickness reduction

Relativistic Scattering States of Coulomb Potential Plus a New Ring-Shaped Potential

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Communications in Theoretical Physics 2006年第5期45卷 889-893页

作者： CHEN chang-Yuan LU Fa-Lin SUN Dong-sheng Department of Physics Yancheng Teachers College Yancheng 224002 China

In this paper, exact solutions of scattering states of the Klein-Gordon equation with Coulomb potential plus a new ring-shaped potential are studied under the condition that the scalar potential is equal to the vector potential. The normalized wave functions of scattering states on the “k/27π scale” and the calculation formula of phase shifts are presented. Analytical properties of the scattering amplitude are discussed.

关键词： Coulomb potential plus a new ring-shaped potential scattering states phase shifts Klein-Gordon equation

BSA Hybrid Synthesized Polymer

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Chinese Chemical Letters 2006年第11期17卷 1519-1522页

作者： Zong Bin LIU Xiao Pei DEN chang sheng ZHAO College of Polymer Science and Engineering Sichuan University Chengdu 610065

Bovine serum albumin （BSA）, a naturally occurring biopolymer, was regarded as a polymeric material to graft to an acrylic acid （AA）-N-vinyl pyrrolidone （NVP） copolymer to form a biomacromolecular hybrid polymer. The hybrid polymer can be blended with polyethersulfone （PES） to increase the hydrophilicity of the PES membrane, which suggested that the hybrid polymer might have a wide application in the modification of biomaterials.

关键词： Bovine serum albumin acrylic acid N-vinyl-pyrrolidone polyethersulfone blending.