检索结果-南通市图书馆

Excitation of Slow Electromagnetic Waves in a Dielectric-Lined Waveguide Having a Thin Annular Plasma Sheet

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第5期15卷 354-356页

作者： WU Jian-qiang LIU Sheng-gang institute of high energy electronics University of Electronic Science and Technology of ChinaChengdu 610054

Excitation of slow electromagnetic waves for a configuration,in which a thin annular relativistic electron beam(TAREB)propagates through a cylindrical,dielectric-lined waveguide having a thin,annular plasma sheet at the same radial position as the TAREB,is studied in the presence of an infinite longitudinal guide magnetic *** dispersion equation is derived and directly numerically *** operation frequency and the growth rate of the waves are obtained and discussed.

关键词： waveguide Waveguide annular

Laboratory measurement of radioactivity purification for ^(212)Pb in liquid scintillator

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

Chinese Physics C 2016年第9期40卷 120-124页

作者：胡维方建俞伯祥张烜周莉蔡啸孙丽君刘万金王岚吕军光 State Key Laboratory of Particle Detection and electronics (institute of high energy Physics CAS) institute of high energy Physics University of Chinese Academy of Sciences

Liquid scintillator（LS） has been widely used in past and running neutrino experiments, and is expected also to be used in future experiments. Requirements on LS radio-purity have become higher and higher. Water extraction is a powerful method to remove soluble radioactive nuclei, and a mini-extraction station has been constructed. To evaluate the extraction efficiency and optimize the operation parameters, a setup to load radioactivity to LS and a laboratory scale setup to measure radioactivity using the ^212Bi-^212Po-^208Pb cascade decay have been developed. Experience from this laboratory study will be useful for the design of large scale water extraction plants and the optimization of working conditions in the future.

关键词： liquid scintillator radioactive load radioactive measurement cascade decay water extraction

Effect of annealing atmosphere on ferromagnetism in Mn doped ZnO films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第2期19卷 476-479页

作者：刘兴翀陆智海张凤鸣 institute of high energy electronics School of Physical ElectronicsUniversity of Electronic Science and Technology of China Department of Physics Nanjing University

This paper reports that Zn0.97Mn0.03O thin films have been prepared by radio-frequency sputtering technology followed by rapid thermal processing in nitrogen and oxygen ambient respectively. Magnetic property investigation indicates that the films are ferromagnetic and that the Curie temperature （Tc） is over room temperature. It is observed that the saturation magnetization of the films increases after annealing in nitrogen ambience but decreases after annealing in oxygen. Room temperature photoluminescence spectra indicate that the amount of defects in the films differs after annealing in the different ambiences. This suggests that the ferromagnetism in Zn0.97Mn0.03O films is strongly related to the defects in the films.

关键词： magnetic semiconductor ZnO photoluminescence

Cavity design and linear analysis of 225 GHz frequency-quadrupling gyroklystron

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第7期18卷 3049-3053页

作者：刘頔威袁学松鄢扬刘盛纲 THz Research Center Research Institute of High Energy ElectronicsUniversity of Electronic Science and Technology of China

This paper considers the frequency-quadrupling three-cavity gyroklystrons with successive frequency-doubling in each *** cavities of 225 GHz frequency-quadrupling gyroklystron are designed with the scattering matrices method and the possible operating mode are *** the point-gap theory,the starting currents of the possible operating modes and the potential parasitic modes in the output cavity are calculated. The optimal operating mode is proposed under consideration of the mode competition and the power capacity of the cavity.

关键词： frequency-quadrupling gyroklystron THz scattering matrices point-gap theory

Design and implementation of the detector control system for the BESⅢ drift chamber cosmic ray test

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2008年第8期32卷 649-652页

作者：陈锡辉谢小希李小男高翠山张银鸿聂振东闵建谢一冈 institute of high energy Physics CAS

After the construction of the BESⅢ drift chamber, a long period of cosmic rays test is necessary to verify its performance. This also provides a good opportunity to integrate the detector readout electronics and Detector Control System （DCS） into a unified working system. The goal of the DCS is to guarantee reliable physics data quality and the safe operation of the detector. It monitors and controls the HV, gas, VME crates and the environmental variables. The upper-level system is mainly developed from LabVIEW and the lower-level system mainly uses MCU and PLC technology. The system is designed to be highly flexible and scalable so that it can be applied to other detectors with little or no change. In the immediate future, it will be integrated into the entire BESⅢ Slow Control System.

关键词： Detector Control System drift chamber LabVIEW

Study of a rectangular coupled cavity extended interaction oscillator in sub-terahertz waves

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2008年第9期17卷 3402-3406页

作者：张开春吴振华刘盛纲 THz Research Center Research Institute of High Energy ElectronicsUniversity of Electronic Science and Technology of China

An extended interaction oscillator （EIO） generating 120 GHz wave in sub-terahertz waves is studied by using the three-dimensional electromagnetic simulation software CST and PIC codes. A rectangular reentrant coupled-cavity is proposed as the slow-wave structure of EIO. By CST, the circuit parameters including frequency-phase dispersion, interaction impedance and characteristic impedance are simulated and calculated. The operation mode of EIO is chosen very close to the point where βL = 2π with corresponding frequency 120 GHz, the beam voltage 12 kV and the dimensions of the cavity with the period 0.5mm, the height 3mm and the width 1.4mm. Simulation results of beam-wave interaction by PIC show that the exciting frequency is 120.85 GHz and output peak power 465 W with 12-period coupled-cavity with the perveance 0.17 μP. Simulation results indicate that the EIO has very wide range of the operation voltage.

关键词： extended interaction oscillator (EIO) rectangular coupled-cavity sub-terahertz (Sub- THz) waves dispersion relation

Self-consistent nonlinear analysis of a frequency-quadrupling terahertz gyroklystron

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第12期18卷 5507-5510页

作者：刘頔威袁学松鄢扬刘盛纲 THz Research Center Research Institute of High Energy ElectronicsUniversity of Electronic Science and Technology of China

This paper analyses a three-cavity frequency-quadrupling terahertz gyroklystron with successive frequency-doubling in each cavity with self-consistent nonlinear theory. The beam-wave interaction efficiency and the electron bunching process are studied. The variation of output efficiency with the length of drift tubes and output power and the variation of Ohmic loss with the length of output cavity are considered. Numerical simulations predict an optimal output efficiency of 1.8%, a power output of more than 2 kW and a gain of 33 dB after taking into account Ohmic losses when the frequency-quadrupling gyroklystron, driven by a 40-kV, 3-A electron beam and 1 Watt input power, operates at 225 CHz.

关键词： frequency-quadrupling gyroklystron terahertz self-consistent nonlinear analysis

MoS2 synaptic transistor with one-step manufacture

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年第1期68卷 357-365页

作者： Yihao GUO Yang WANG Wenjie DENG Yi WU Jingtao LI Kexin LI Yuehui ZHAO Songlin YU Xiaoting WANG Yongzhe ZHANG Hui YAN Key Laboratory of Optoelectronics Technology of Education Ministry of China Faculty of Information TechnologyBeijing University of Technology Key Laboratory of Advanced Functional Materials Ministry of Education Faculty of Materials and ManufacturingBeijing University of Technology The 11th Research institute of electronics Technology Group Corporation

The synaptic transistor,which is a neuromorphic device with brain-like functions,has garnered significant attention due to characteristics such as low energy consumption,high integration,multiple functions,and high computational ***,the current synaptic transistor possesses a complicated structure and involves complex manufacturing steps,which is not conducive to low-cost,large-scale bionic ***,we introduce a simple MoS2synaptic transistor exhibiting robust synaptic *** transistor utilizes magnetron sputtering manufacture to combine the process of device metal electrode deposition and the introduction of defect states,which helps streamline the manufacturing process into a single *** long-term potentiation and long-term depression in photoelectric coordination are initially ***,biological functions,such as double pulse facilitation and the transformation behavior of short-term memory to long-term memory,are thoroughly evaluated,along with learning-forgetting-relearning ***,the device exhibits robust synaptic plasticity until incident light angles down to 30° to imitate the multi-to-one axon-cellular ***,a classical simulation of Pavlov's dog conditioned reflex is demonstrated along with the multiview extraction *** experimental results demonstrate a promising synaptic transistor with a simple structure,manufacturing technique,and excellent *** further indicates the potential for large-scale integration of bionic neuromorphic systems.

关键词： process optimization artificial synaptic device one-stepmanufacture synaptic plasticity bionic simulation

同方期刊数据库

Computational mechanistic investigation of radiation damage of adenine induced by hydroxyl radicals

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第2期27卷 64-70页

作者：谈荣日刘慧宣寻大毛宗文军 College of Communication and electronics Jiangxi Science & Technology Normal University institute of high energy Physics Chinese Academy of Sciences

The radiation damage of adenine base was studied by B3LYP and MP2 methods in the presence of hydroxyl radicals to probe the reactivities of five possible sites of an isolated adenine molecule. Both methods predict that the C8 site is the more vulnerable than the other sites. For its bonding covalently with the hydroxyl radicals, B3LYP predicts a barrierless pathway, while MP2 finds a transition state with an energy of 106.1 kJ/mol. For the hydroxylation at the C2 site, the barrier was calculated to be 165.3 kJ/mol using MP2 method. For the dehydrogenation reactions at five sites of adenine, B3LYP method predicts that the free energy barrier decreases in the order of H8 〉 H2 〉 HN62 〉 HN61 〉 HN9.

关键词： DNA damage radicals adenine dehydrogenation