检索结果-南通市图书馆

Simulation study of the performance of quadruple-GEM detectors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2023年第1期7卷 107-116页

作者： Yue Wang Licheng Zhang Aera Jung Dayong Wang yong ban State Key Laboratory of Nuclear Physics and Technology Physics SchoolPeking UniversityBeijing100871China

Background Gas Electron Multiplier(GEM)detectors are widely used for high-energy physics experiments,such as the triple-GEM detector installed in CMS,due to their excellent performance.A quadruple-GEM detector is regarded as the candidate for the upgrade projects of the High Luminosity LHC(HL-LHC).Method In this paper,key performance characteristics of quadruple-GEM detectors are studied in detail based on Monte Carlo simulation using the Garfield++and ANSYS software *** parameterization method is *** The spatial and time resolution,effective gain,efficiency,and electron transparency are obtained via simulation for different detector geometries and operating *** create a quadruple-GEM structure that meets the geometric requirements of the CMS endcap muon *** These studies help to understand the physical mechanisms of GEM detectors and provide references for the detector design,operating condition optimization and technical scheme selection in future applications.

关键词： Quadruple-GEM Monte Carlo simulation Resolution Gain Electron transparency Efficiency

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

基于InSAR的城市建筑安全监测技术研究

工业建筑 2024年第2期54卷 51-57页

作者：朱茂葛春青班勇周宁远徐康李吉平北京东方至远科技股份有限公司北京100081

城市建筑安全涉及人民的生命财产,近年已有多起建筑局部坍塌造成严重损害。为实现“灾前预防”的现代化城市建筑设施安全监管,基于PS-InSAR技术,提出一种针对于城市建筑及基础设施的大范围安全风险评估方法。通过结合InSAR原理,提取建... 详细信息

城市建筑安全涉及人民的生命财产,近年已有多起建筑局部坍塌造成严重损害。为实现“灾前预防”的现代化城市建筑设施安全监管,基于PS-InSAR技术,提出一种针对于城市建筑及基础设施的大范围安全风险评估方法。通过结合InSAR原理,提取建筑PS点聚类,分析聚类点形变信息,根据建筑物风险相关指标提取有效形变,参考建筑类型及区域情况划分风险等级标准,进而评价区域内建筑设施的安全风险情况。以长春市为例,利用COSMO-SkyMed卫星时序数据,对主城区建筑物进行大范围安全风险监测试验,并对评价为D级需重点关注的建筑进行实地踏勘,发现均存在较为明显的隐患情况。证实了方法的可行性以及准确性,能够为大范围城市建筑设施定期“体检”提供技术支持,保障城市建筑安全。

关键词：城市建筑安全 PS-InSAR技术安全风险监测长春市

Simulation study of the performance of new micropattern gaseous detectors

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2018年第1期2卷 144-150页

作者： Shaokun He Qianming Huang Hao Qiao Dayong Wang yong ban State Key Laboratory of Nuclear Physics and Technology Physics SchoolPeking UniversityBeijing 100871China

Background The micropattern gaseous detectors(MPGDs)are widely used in high-energy physics experiment,such as detector upgrade projects in LHC,due to its excellent performance on rate capability,spatial and time *** In this paper,we studied the performances of GEM,FTM andμ-RWELL detectors on time and spatial resolutions using Monte Carlo simulation methods and compared their performances and characteristics at various working *** Result shows that time resolution of MPGDs improves with the increase of electric field intensity in drift region,while spatial resolution shows the reverse *** addition,detectors operating with an electronegative gas mixture show better performances on both time and spatial *** We studied the performance of triple-GEM,FTM andμ-RWELL detectors with Monte Carlo *** this paper,ANSYS and GARFIELD are used to build full electric field model of the *** time resolution and spatial resolution are derived,which are very important for triggering performance and track reconstruction *** results will provide references on detector design and the technology chosen in LHC detector upgrade projects.

关键词： Monte Carlo simulation Micropattern gaseous detectors Time resolution Spatial resolution

A new species of the genus Ethmolaimus de Man,1880(Nematoda,Ethmolaimidae)from intertidal zone of the Yellow Sea,China

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

Zoological Systematics 2024年第2期49卷 175-180页

作者： Shuyan ban Ting Li yong Huang College of Life Sciences Liaocheng UniversityLiaocheng 252059ShandongChina

In order to investigate the biodiversity of free-living nematodes along the coast of the Yellow Sea,sediment samples were collected in a number of intertidal sites in recent *** this area,the mean abundance of free-living nematodes is 1663±502 ind 10 cm^(-2),and more than 200 species have been found(Zhai et al.,2020;Hao et al.,2021,2022;Chu et al.,2023).Among them,species from the genera,Daptonema,Thalassomonhystera,Parodontophora and Bathylaimus,are the most common,while the species,Daptonema parabreviseta Huang&Sun,Parodontophora deltensis Zhang,Bathylaimus huanghaiensis Huang&Zhang and Thalassomonhystera siamensis Kito&Aryuthaka are in ***,a species belongs to the genus Ethmolaimus is identified as new to science,namely *** *** is also the first time for the genus reported in the Chinese sea area.

关键词： sp.nov biodiversity new

Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH Solutions at Ampere‑Level Current

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第3期16卷 212-226页

作者： Min Zhang Aihui Cao Yucui Xiang Chaogang ban Guang Han Junjie Ding Li‑yong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy Storage Materials and Equipment Chongqing 401135People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/Sn-SnO_(2)nanosheets Electronic structure Porous solid electrolyte Pure

在线全文

学校读者我要写书评

暂无评论

高阶FE-BI方法及一种新型的预条件技术

电波科学学报 2007年第2期22卷 196-203页

作者：班永灵聂在平电子科技大学电子工程学院四川成都610054

将基于六面体网格的高阶矢量基函数(higher order vector basisfunction)引入到矢量有限元-边界积分(FE-BI)混合方法中,用于建模带有深腔和狭长缝隙结构三维目标的电磁散射特性;提出了一种新型的预条件技术,用于加速FE-BI系统的迭代求解... 详细信息

将基于六面体网格的高阶矢量基函数(higher order vector basisfunction)引入到矢量有限元-边界积分(FE-BI)混合方法中,用于建模带有深腔和狭长缝隙结构三维目标的电磁散射特性;提出了一种新型的预条件技术,用于加速FE-BI系统的迭代求解;给出了结合该预条件技术的GMRES方法求解腔体电磁散射的算例;数值结果证明了高阶FE-BI方法相对于低阶FE-BI方法的优势以及新型预条件技术的有效性。

关键词：高阶矢量基函数有限元边界积分预条件散射

在线全文

学校读者我要写书评

暂无评论

一种基于高阶矢量基函数的叠层预条件技术

电子学报 2007年第9期35卷 1739-1744页

作者：班永灵聂在平于哲峰电子科技大学电子工程学院四川成都610054 中国空气动力研究与发展中心四川绵阳621000

基于六面体的高阶叠层基函数,提出了一种新颖的构造预条件矩阵的方法.该方法基于叠层基函数特有的嵌套性质,利用特殊的编号策略,将由有限元方法导致的系数矩阵分成块矩阵的形式,最后由不完全LU分解(ILU)导出近似的预条件矩阵.结合该预... 详细信息

基于六面体的高阶叠层基函数,提出了一种新颖的构造预条件矩阵的方法.该方法基于叠层基函数特有的嵌套性质,利用特殊的编号策略,将由有限元方法导致的系数矩阵分成块矩阵的形式,最后由不完全LU分解(ILU)导出近似的预条件矩阵.结合该预条件技术,发展了一种叠层预条件-GMRES算法,并将该预条件算法用于加速三维腔体散射的矢量有限元/边界积分(FE-BI)矩阵方程的迭代求解,讨论了该预条件算法中块矩阵ILU分解截断门限Tdr对算法的影响.

关键词：预条件技术高阶基函数矢量有限元/边界积分方法散射

在线全文

学校读者我要写书评

暂无评论

应用于气体电子倍增器的电子学板研制

原子能科学技术 2020年第6期54卷 1013-1017页

作者：王珂薛志华王大勇班勇北京大学物理学院核物理与核技术国家重点实验室北京100871

气体电子倍增器(GEM)电子学板(GEB)在大面积GEM探测器系统中起重要作用.为满足大面积GEM探测器系统中高速电子学信号的传输、实现电磁屏蔽及为前端电子学提供电源等需求,本文设计了8层结构的GEB,并对该GEB原型进行了电气性能、机械兼容... 详细信息

气体电子倍增器(GEM)电子学板(GEB)在大面积GEM探测器系统中起重要作用.为满足大面积GEM探测器系统中高速电子学信号的传输、实现电磁屏蔽及为前端电子学提供电源等需求,本文设计了8层结构的GEB,并对该GEB原型进行了电气性能、机械兼容性、信号传输和噪声测试.测试结果显示,本文所设计的GEB在320 Mb/s信号传输速度下的误码率小于10^-13,在保证信号高速性和完整性的基础上能成功传输前端电子学信号;通过采用叠层对称式设计克服了大面积G EB生产时弯曲程度高的困难,生产的GEB原型弯曲高度降低了2/3,平均弯曲高度为1 mm,增强了前端电子学在探测器系统中的运行稳定性.

关键词：气体电子倍增器电子学板高速信号完整性阻抗匹配电磁屏蔽

在线全文

学校读者我要写书评

暂无评论

植物生活史对策的进化

生态学杂志 1995年第3期14卷 33-39页

作者：班勇中国林业科学院林业研究所

植物生活史对策的进化班勇（中国林业科学院林业研究所，北京１０００９１）ＥｖｏｌｕｔｉｏｎｏｆＬｉｆｅＨｉｓｔｏｒｙＳｔｒａｔｅｇｙｉｎＰｌａｎｔｓ￥ＢａｎＹｏｎｇ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＦｏｒｅｓｔｒ... 详细信息

植物生活史对策的进化班勇（中国林业科学院林业研究所，北京１０００９１）ＥｖｏｌｕｔｉｏｎｏｆＬｉｆｅＨｉｓｔｏｒｙＳｔｒａｔｅｇｙｉｎＰｌａｎｔｓ￥ＢａｎＹｏｎｇ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＦｏｒｅｓｔｒｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏ...

关键词：植物生活史对策进化选择压