检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

伽马射线探测器冲击减振设计及验证

航天器环境工程 2024年第2期41卷 167-175页

作者：张志港孟春玲王瑞杰董永伟孙建超北京工商大学人工智能学院北京100048 中国科学院高能物理研究所北京100049

针对某伽马射线探测器受到振动冲击后敏感器件损坏严重的问题进行减振设计,研究减振器阻尼层尺寸参数对整体固有频率和抗冲击性能的影响,以及薄壁结构基座对抑制振动和冲击传递的影响;进而采取设计减振器、合理选取阻尼层尺寸参数、增... 详细信息

针对某伽马射线探测器受到振动冲击后敏感器件损坏严重的问题进行减振设计,研究减振器阻尼层尺寸参数对整体固有频率和抗冲击性能的影响,以及薄壁结构基座对抑制振动和冲击传递的影响;进而采取设计减振器、合理选取阻尼层尺寸参数、增加二级阻尼缓冲减振和改进薄壁结构的措施完成减振设计;最后通过仿真和试验验证减振设计的合理性。研究表明:减振器能够降低结构刚度,对冲击产生大幅度衰减作用;阻尼层直径是提高抗冲击性能的主要因素,探测器整体固有频率和冲击响应均随阻尼层直径的增加而减小;薄壁结构基座对激励有放大作用,可以通过调整局部结构降低冲击响应;二级阻尼缓冲减振设计对关键器件有较好的减振功效,尤其是在低频段。该研究可为有结构限制要求的航天器的冲击减振设计提供参考。

关键词：减振设计有限元法阻尼层冲击减振二级阻尼缓冲减振

维普期刊数据库博看期刊

Study on temperature response of the HERD calorimeter cell

在线全文

学校读者我要写书评

暂无评论

辐射探测技术与方法(英文) 2023年第2期7卷 227-233页

作者： Yingying Dai Xingzhu Cui Xin Liu yongwei dong Hongwei Liang Zhenzhong Zhang Xiaochuan Xia Zhipeng Wei State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and TechnologyChangchun130022China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing100049China School of Microelectronics Dalian University of TechnologyDalian116024China

Purpose To derive the temperature response of the basic unit of the electromagnetic calorimeter of the high energy cosmic-radiation detection(HERD)*** Tested a method to measure HERD calorimeter cell(HCC)light yield using an ultraviolet Light-Emitting Diode with a wavelength of 300 nm,and established an experimental setup and tested the light yield of the HCC at different temperatures in a thermal *** and conclusions The result showed that the signal amplitudes variation of the HCC reached up to 10.2% with temperature ranging from 0 to 60℃,if we narrow the temperature range to 0-35℃,the variation was about 3.7% and it showed much better *** result provides a good instruction on the thermal control of the HERD calorimeter(CALO)to improve its performance.

关键词： HERD LYSO WLSF Optical output Temperature response

Light collection of the POLAR detector

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

Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 43-46页

作者： dong yongwei,LI YanGuo,WU BoBing,ZHANG YongJie & ZHANG ShuangNan Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 1. Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

POLAR is a compact polarimeter dedicated to measuring the polarization of GRBs between 50-350 *** light collection of 200 mm×6 mm×6 mm plastic bars has been simulated and optimized in order to get uniform response to X-rays at different points along one single *** to the Monte Carlo results,the amplitude uniformity strongly depends on the level of polishing of the scintillator surface and the covering.A uniformity of 89% is achieved with a prototype constructed by a non position-sensitive PMT and an array of 4×4 bars.

关键词： plastic scintillator light collection gamma-ray burst polarimeter

SVOM gamma ray monitor

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 40-42页

作者： dong yongwei,WU BoBing,LI YanGuo,ZHANG YongJie & ZHANG ShuangNan Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 1. Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

The space-based multi-band astronomical Variable Object Monitor(SVOM) mission is dedicated to the detection,localization and broad-band study of gamma-ray bursts(GRBs) and other high-energy transient *** gamma ray monitor(GRM) onboard is designed to observe GRBs up to 5 *** this instrument,one of the key GRB parameters,Epeak,can be easily measured in the hard X-ray *** can achieve a detection rate of 100 GRBs per year which ensures the scientific output of SVOM.

关键词： gamma-ray burst Epeak triple phoswich

Study of linearity of LYSO crystal for the high energy cosmic radiation detection(HERD)facility

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2017年第1期1卷 21-28页

作者： Zheng Quan Zhigang Wang Ming Xu yongwei dong Junjing Wang Guangpeng An Xin Liu Tianwei Bao Li Zhang RuijieWang Junguang Lv Bobing Wu Shuangnan Zhang Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsCASBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsCASBeijing 100049China

The high energy cosmic-radiation detection(HERD)facility is a space mission designed for detecting cosmic ray(CR)electrons,γ-rays up to tens of TeV and CR nuclei from proton to iron up to several *** main instrument of HERD is a 3-D imaging calorimeter(CALO)composed of nearly ten thousand lutetium yttrium orthosilicate(LYSO,with cerium doping)crystal cubes.A large dynamic range of single HERD CALO Cell(HCC)is necessary to achieve HERD’s PeV observation objectives,which means that the response of HCC should maintain a good linearity from minimum ionizing particle(MIP)calibration to PeV shower *** order to study the linearity ofHCC over such a large energy range,a beam test has been implemented at the E2 and E3 beam lines of *** intensity pulsed electron beam provided by E2 line is used for producing high energy density within HCC;π^(+)/proton provided by E3 line are used *** results showthat no saturation effect occurs and the linearity ofHCCis better than 10%from 30 MeV(1MIP)to 1.1×10^(3) TeV(energy density is 93 TeV/cm^(3)),which can meet the requirement mentioned above.

关键词： HERD Calorimeter LYSO Linearity Beam test

Side-On transition radiation detector(TRD)based on THGEM

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

Radiation Detection Technology and Methods 2020年第3期4卷 257-262页

作者： Xiwen Liu Bo Huang Huanbo Feng Hongbang Liu Wenjin Xie Xuefeng Huang Shuai Chen Jianyu Gu Xiaochuan Xie Jin Zhang Qian Liu Yongbo Huang yongwei dong Ming Xu Enwei Liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanningChina University of Chinese Academy of Sciences BeijingChina The Institute of High Energy Physics of the Chinese Academy of Sciences BeijingChina

Purpose The characteristic that TR energy is proportional to the Lorentz factor provides a way for energy *** High Energy cosmic-Radiation Detection calorimeter can be calibrated in space by the TRD in the *** In order to make the TR signal stand out from the energy loss signal,a new prototype of TRD called Side-On TRD with THGEM has been ***-on TRD uses side window incidence and strip readout to reduce the ionization energy registered in the channel where the TR photons are located,which is supposed to improve the detection efficiency of *** and conclusion The Side-On TRD has been tested at CERN SPS and found the experimental results are significant.

关键词： Transition radiation detector THGEM Test beam experiment Radiator

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

混合碳政策下供应链减排决策优化

系统管理学报 2017年第5期26卷 947-956页

作者：程永伟穆东马婷婷北京交通大学经济管理学院北京100044 北京物资学院现代物流产业研究院北京101149

建立了碳交易-碳税(环境税)并行政策下的两阶段供应链减排决策模型,研究了混合碳政策对供应链定价、产能、利润、减排率及最优的有偿配额比例、竞价底价、混合策略等的影响,并引入"优先采购协议"和"碳排放约束-收益共享契约"对供应链实... 详细信息

建立了碳交易-碳税(环境税)并行政策下的两阶段供应链减排决策模型,研究了混合碳政策对供应链定价、产能、利润、减排率及最优的有偿配额比例、竞价底价、混合策略等的影响,并引入"优先采购协议"和"碳排放约束-收益共享契约"对供应链实施协调,得到既能降低供应链碳排放水平,又能增进供应链社会福利的Nash均衡减排模式。研究结果表明:(1)高强度的碳政策并不一定能有效激励企业减排,提高消费者对低碳产品认可度和碳市场活跃度才能推动供应链"良性"减排;(2)我国当前最优的有偿配额比例为3.4%,"有偿配额-减排补贴"的配套机制不仅能激发碳市场活跃度,而且其竞价成本效应和转移支付效应可对高污染落后产能发挥"逆淘汰"作用;(3)限价策略下的集中式决策能够实现减排效率的Pareto改进。最后,采用数值算例验证了模型的有效性。

关键词：碳政策低碳供应链碳减排碳交易碳税

一种基于概率图模型的多时相SAR相干变化检测方法

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2017年第12期39卷 2912-2920页

作者：冀广宇董勇伟李焱磊梁兴东中国科学院电子学研究所微波成像技术重点实验室北京100190 中国科学院大学北京100049

相干变化检测(CCD)利用重轨SAR数据对场景中表现为低相干特性的变化区域具有良好的检测性能,然而场景中诸如植被、阴影、强散射旁瓣、低散射等区域也呈现低相干特性,对检测结果造成干扰,尤其在高波段SAR CCD中,对检测效果影响更加明显... 详细信息

相干变化检测(CCD)利用重轨SAR数据对场景中表现为低相干特性的变化区域具有良好的检测性能,然而场景中诸如植被、阴影、强散射旁瓣、低散射等区域也呈现低相干特性,对检测结果造成干扰,尤其在高波段SAR CCD中,对检测效果影响更加明显。该文利用多时相SAR数据形成的相干变化差异图像(CCD图像)建立概率图模型,提出一种多时相CCD处理方法。该方法以多时相CCD图像作为观测量,通过选取合适的参与处理图像数量及优化场景中变化区域的分类,计算目标变化区域的后验概率,可有效减小低相干干扰区域造成的影响。仿真和实测数据结果验证了该方法的正确性和有效性。

关键词：重轨合成孔径雷达相干变化检测多时相概率图模型后验概率

在线全文

学校读者我要写书评

暂无评论

语文作文教学弊端与解决路径探微

成才之路 2020年第20期 142-143页

作者：董永威甘肃省武威第十三中学甘肃武威733000

文章探讨初中语文作文教学存在的弊端以及对应问题的解决策略。作文体现的是个体的语言表达以及逻辑思维。在初中阶段开展作文教学时,教师要不断更新教学理念,创新教学方法,合理运用作文教材,有效激发学生的写作兴趣,重点培养学生的作... 详细信息

文章探讨初中语文作文教学存在的弊端以及对应问题的解决策略。作文体现的是个体的语言表达以及逻辑思维。在初中阶段开展作文教学时,教师要不断更新教学理念,创新教学方法,合理运用作文教材,有效激发学生的写作兴趣,重点培养学生的作文语言运用能力,提升学生的语文学科综合素养。

关键词：初中语文作文教学教学弊端问题解决