检索结果-内蒙古大学图书馆

Performance assessment of Cs I(T1) screens on various substrates for X-ray imaging

Chinese Physics C 2015年第7期39卷 102-106页

作者：冯召东蒋鹏张红凯赵博震秦秀波魏存峰刘宇魏龙 Key Laboratory of Nuclear Radiation and Nuclear Energy Technology Institute of High Energy PhysicsChinese Academy of Sciences Beijing Engineering Research Center of Radiographic Techniques and Equipment University of Chinese Academy of Sciences The College of Nuclear Technology and Automation Engineering Chengdu University of Technology

Thallium-doped cesium iodide（Cs I（Tl）） screens are widely used in X-ray imaging devices because of the columnar structure of the Cs I（Tl） layer, but few reports focus on the optical role of the substrate in the screen *** this paper, four substrates including fused silica（Si O2）, silver-film coated Si O2, graphite（C） and fiber optic plate（FOP） are used to fabricate Cs I（Tl） screens by thermal evaporation. Their imaging performance is evaluated by relative light output（RLO）, modulation transfer function（MTF）, normalized noise power spectrum（NNPS） and noise equivalent quanta（NEQ）. The results reveal that although Cs I（Tl） film on graphite plate yields images with the lowest light output, it presents relatively higher spatial resolution and better signal-to-noise ***, films on Si O2 plate obtain low MTF but high NNPS curves, whether they are coated with silver film or ***, scintillation screens on FOP have bright images with low NNPS and high NEQ, but have the lowest MTF. By controlling the substrate optical features, Cs I（Tl） films can be tailored to suit a given application.

关键词： Cs I（T1） scintillation screen substrate imaging performance evaluation

来源：评论

学校读者我要写书评

暂无评论

The new structure design and simulation of anti-electric shock multijacks socket

引用

Open Electrical and Electronic engineering Journal 2015年第1期9卷 427-431页

作者： Hu, Chuanmei College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology ChengduSichuan610059 China

The design to meet consumer demand for safe, durable, attractive appearance and easy to use of socket, is an improvement and innovation in appearance and structure of the multi-jacks socket from anti-electric shock, multifunctional, intelligent, environmental protection and others. The new multi-jacks socket has the properties of anti-electric shock, automatically incorporating wires, jacks different direction, beautiful appearance, and it can be the decoration of home space. © Hu Chuanmei.

关键词： Consumer protection

来源：评论

学校读者我要写书评

暂无评论

A novel plan for crime scene reconstruction 5

A novel plan for crime scene reconstruction

引用

5th International Conference on Computer engineering and Networks, CENet 2015

作者： Liao, Guangjun Zheng, Yali Zhao, Lixuan Wu, Xuedong Faculty of Forensic Science and Technology Guangdong Police College Guangzhou510320 China School of Automation Engineering University of Electronic Science and Technology of China Chengdu611731 China

The traditional methods of registering crime scene, such as photographs, sketches, videos and oral descriptions, etc., are lowly efficient and couldn't meet the requirement. In this paper, a new method for crime scene reconstruction which combines the virtual reality techniques with efficient interaction is hereby proposed. The new techniques, such as close-range photogrammetry, panorama photography and crime scene virtual tour, are used for recoding and showing the complex crime scene. The case study shows it's a good way for analyzing crime scene. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Photography

来源：评论

学校读者我要写书评

暂无评论

Chain-type wireless sensor network node scheduling strategy

引用

Journal of Systems engineering and Electronics 2014年第2期25卷 203-210页

作者： Guangzhu Chen Qingchun Meng Lei Zhang College of Nuclear Technology and Automation Engineering Chengdu University of Technology School of Mechanical and Electrical Engineering China University of Mining and Technology

In order to reduce power consumption of sensor nodes and extend network survival time in the wireless sensor network （WSN）, sensor nodes are scheduled in an active or dormant mode. A chain-type WSN is fundamental y different from other types of WSNs, in which the sensor nodes are deployed along elongated geographic areas and form a chain-type network topo-logy structure. This paper investigates the node scheduling prob-lem in the chain-type WSN. Firstly, a node dormant scheduling mode is analyzed theoretical y from geographic coverage, and then three neighboring nodes scheduling criteria are proposed. Sec-ondly, a hybrid coverage scheduling algorithm and dead areas are presented. Final y, node scheduling in mine tunnel WSN with uniform deployment （UD）, non-uniform deployment （NUD） and op-timal distribution point spacing （ODS） is simulated. The results show that the node scheduling with UD and NUD, especial y NUD, can effectively extend the network survival time. Therefore, a strat-egy of adding a few mobile nodes which activate the network in dead areas is proposed, which can further extend the network survival time by balancing the energy consumption of nodes.

关键词： wireless sensor network （WSN） chain-type nodescheduling network survival time mobile nodes.

来源：评论

学校读者我要写书评

暂无评论

Model order estimation for sparse wideband signal compressive sensing 12

Model order estimation for sparse wideband signal compressiv...

引用

12th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2015

作者： Xiaoyan, Zhuang Yijiu, Zhao Ling, Long School of Electrical Engineering and Electronic Information Xihua University Chengdu610039 China School of Automation Engineering University of Electronic Science and Technology of China Chengdu611731 China College of Electrical and Information Engineering Southwest University for Nationalities Chengdu610041 China

ISBN: (纸本)9781479976195

Compressive sampling (CS) has been wildly investigated in wideband signal spectrum sensing. A variety of signal reconstruction algorithms are reported for CS. Usually, the eigenvalues of covariance matrix of compressive measurements are used to estimate signal model order. However, due to the noise introduced in the sampling stage and the finite length of sampling data, the performance of signal model order estimation would be degraded. In this paper, we present a model order estimation approach for CS signal reconstruction. The proposed approach is based on minimum description length (MDL) criterion, which is used to distinguish between signal subspace and noise subspace. We evaluate the performance of the proposed algorithm in the framework of modulated wideband converter (MWC), which is designed based on CS. It is shown that the signal model order can be reliably estimated using the proposed algorithm. © 2015 IEEE.

关键词： Compressed sensing

来源：评论

学校读者我要写书评

暂无评论

Random Au-Ag composite nanoparticles as broadband antireflection coating for Si surface

引用

Journal of Computational and Theoretical Nanoscience 2015年第10期12卷 3781-3786页

作者： Yang, Lanying Fu, Junxue Liu, Mingzhe Tang, Huiqiang College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong

Gold (Au) and silver (Ag) monometallic nanoparticles (MNPs) and Au-Ag composite nanoparticles (CNPs) were fabricated on silicon wafers by anneal de-wetting the corresponding thin films. The measured reflection spectra show that the Au-Ag CNPs demonstrate a 28% decrease in average reflection (Rav) over the 300-1200 nm range, compared to the bare silicon (Si) surfaces. CNPs also exhibit a better broadband antireflection than both Au and Ag MNPs, which is consistent with simulation results. This study opens a low-cost and easily fabricated pathway to achieve broadband antireflection coating on Si surface. Copyright © 2015 American Scientific Publishers.

关键词： Nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Minimum detectable activity for NaI(Tl) airborne γ-ray spectrometry based on Monte Carlo simulation

引用

Science China(Technological Sciences) 2014年第9期57卷 1840-1845页

作者： GONG ChunHui ZENG GuoQiang GE LiangQuan TANG Xiaobin TAN ChengJun Department of Nuclear Science and Engineering Nanjing University of Aeronautics and Astronautics College of Nuclear Technology and Automation Engineering Chengdu University of Technology

The determination of the effective minimum detectable activity （MDA） of radionuclides by a detection system plays an im- portant role in environmental radiation monitoring. In this study, the responses of an NaI（TI） airborne γ ray spectrometry （AGRS） system to different radionuclides （137Cs and 131I） were investigated using the Monte Carlo technique. The MDA values were determined under different conditions according to the counting spectra obtained from the Monte Carlo simulation. The equivalent mass thickness method was applied to the Monte Carlo modeling for monitoring ground radiation to reduce sta- tistical uncertainty. The secondary source method was used to monitor both air and ground radiation. A quadratic relationship was found between the MDA and activity concentration. An exponential relationship was found between the MDA and altitude The MDA of a specific radionuclide from external detectors was found to be superior to that obtained from internal detectors under the same conditions. The MDA values in an NaI（Tl） AGRS system under different conditions can be estimated based on the results of this study.

关键词： NaI（TI） airborne γ-ray spectrometry minimum detectable activity Monte Carlo simulation

来源：评论

学校读者我要写书评

暂无评论

The 5th International Conference on Biomedical engineering and Biotechnology (ICBEB 2016) Abstracts

引用

BMC MEDICAL IMAGING 2016年第SUPPL 1期16卷 65-65页

作者： [Anonymous] Department of MRI Shandong Medical Imaging Research Institute Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China Department of Interventional Radiology Shandong Provincial Hospital Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China College of Information Science and Technology Engr. Research Center of Digitized Textile & Fashion Tech. for Ministry of Education Donghua University Shanghai 201620 China Intelligent multimedia information processing Lab College of Software Northeastern University Shenyang Liaoning Province 110004 China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Computer Science and Technology Nanjing Normal University Nanjing China Department of Electrical Engineering The City College of New York CUNY New York USA Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China School of Electronic Science and Engineering Nanjing University Nanjing Jiangsu 210046 China College of Engineering Nanyang Technological University Singapore 639798 Singapore School of Electronic Information Shanghai Dianji University Shanghai China School of Natural Sciences and Mathematics Shepherd University Shepherdstown WV 25443 USA Davis College of Agriculture Natural Resources and Design West Virginia University Morgantown WV 26505 USA State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Center of Medical Physics and Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China College of Agricultural and Life Sciences University of Florida Gainesville FL 32611 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA Translational Imaging Division & MRI Unit Columbia University and New York State Psychiatric Institute New York NY 10032 USA Guangxi Key Laboratory of Manufacturing System & Adv

来源：评论

学校读者我要写书评

暂无评论

Molecular Dynamics Simulation of Xe Behavior in U-Mo Alloys Fuel

引用

Chinese Physics Letters 2014年第4期31卷 130-133页

作者： XIAO Hong-Xing TANG Rui TIAN Xiao-Feng LONG Chong-Sheng Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610041 The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059

Classical molecular dynamics simulations are used to investigate the fission gas Xe behavior in a U-Mo alloy fuel matrix. The embedded atom method potential proposed by Smirnova et al. is used to describe the U-Mo-Xe system. The results show that the initial configuration of interstitial Xe atoms in U-Mo alloys is very instable and has a strong tendency to get together and to form a Xe bubble by ejecting the adjacent U atoms and Mo atoms from their former normal lattice sites. The pressure in Xe bubbles is initially quite high and then drops with increasing Xe concentration obviously. The matrix swelling of U-Mo alloys associated with the Xe bubble growth follows approximately a linear relationship with the ratio of Xe to U at low Xe concentration while the rate of swelling increases rapidly at high Xe concentration. The simulation results are in good agreement with the experimental data. The recovery of the damaged structure in the U-Mo alloys matrix is also investigated. It is shown that a damaged structure cannot be recovered completely after a system is relaxed for a long time while still having lots of defects.

关键词： MOLECULAR dynamics -- Simulation methods XENON THERMAL properties FISSION gases SWELLING of materials NUCLEATION

来源：评论

学校读者我要写书评

暂无评论

Design and modeling of a micro piezoelectric electric generating device with adjustable resonance frequency

引用

Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2015年第5期36卷 403-411页

作者： Chen, Guang-Zhu Fu, Hai-Ling Meng, Qing-Chun Bao, Jiu-Sheng College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 China School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 China

Aiming at the inconvenience of energy supplying for microelectronic devices, a micro piezoelectric electric generating device working based on surrounding vibrations was designed in this paper. As the device may harvest a biggest energy when it is resonating with the surrounding vibrations, its resonance frequency was designed adjustable with the span of piezoelectric vibrators. What is more, the harvesting performance of the micro generating device was investigated by theoretical modeling and finite element analyzing methods. It is found that the resonance frequency rises with the span increasing and the variation can be 500Hz or more. The output voltage depends on the structure parameters of the piezoelectric vibrators. By contrast, it rises with the increasing of vibrator's length while decreases with the increasing of metal substrate's thickness and the linearity between them are all well. However, it rises first then falls with the increasing of both the vibrator's width and the piezoelectric ceramic piece's thickness. The optimal interval values of the width and the thickness are 4~5mm and 0.4~0.5mm, respectively. The theoretical calculations have similar variation trends with the finite element simulations. However, there are some differences between them as the joint points are not included when calculating the equivalent mass which should be noticed in actual applications. It is believed that this work may provide an effective technological way for energy supplying of low energy microelectronic products such as wireless sensor network nodes and so on. © 2015, Chinese Mechanical engineering Society. All right reserved.

关键词： Vibrators

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：