检索结果-南通市图书馆

同方期刊数据库

The energy response of LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals for GECAM

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第2期35卷 110-122页

作者： Pei-Yi Feng Xi-Lei Sun Zheng-Hua An Yong Deng Cheng-Er Wang Huang Jiang Jun-Jie Li Da-Li Zhang Xin-Qiao Li shao-lin xiong Chao Zheng Ke Gong Sheng Yang Xiao-Jing Liu Min Gao Xiang-Yang Wen Ya-Qing liu Yan-Bing Xu Xiao-Yun Zhao Jia-Cong Liu Fan Zhang Hong Lu Particle and Astrophysics Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Experimental Physics Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of South ChinaHengyang 421001China National Engineering Research Center for Rare Earth Grirem Advanced Materials Co.Ltd.and General Research Institute for Nonferrous MetalsBeijing 100088China

The GECAM series of satellites utilizes LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals as sensitive materials for gamma-ray detectors(GRDs).To investigate the nonlinearity in the detection of low-energy gamma rays and address the errors in the calibration of the E-C relationship,comprehensive tests and comparative studies of the three aforementioned crystals were conducted using Compton electrons,radioactive sources,and mono-energetic *** nonlinearity test results of the Compton electrons and X-rays demonstrated substantial differences,with all three crystals presenting a higher nonlinearity for X/-rays than for Compton *** the LaBr_(3)(Ce)and LaBr_(3)(Ce,Sr)crystals having higher absolute light yields,they exhibited a noticeable nonlinear decrease in the light yield,especially at energies below 400 *** NaI(Tl)crystal demonstrated an"excess"light output in the 6-200 keV range,reaching a maximum"excess"of 9.2%at 30 keV in the X-ray testing and up to 15.5%at 14 keV during Compton electron testing,indicating a significant advantage in the detection of low-energy gamma ***,we explored the underlying causes of the observed nonlinearity in these *** study not only elucidates the detector responses of GECAM,but also initiates a comprehensive investigation of the nonlinearity of domestically produced lanthanum bromide and sodium iodide crystals.

关键词： LaBr_(3)(Ce)detector LaBr_(3)(Ce,Sr)detector NaI(Tl)detector GECAM Energy response Light yield nonlinearity

Observation of spectral lines in the exceptional GRB 221009A

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 187-206页

作者： Yan-Qiu Zhang shao-lin xiong Ji-Rong Mao Shuang-Nan Zhang Wang-Chen Xue Chao Zheng Jia-Cong Liu Zhen Zhang Xi-Lu Wang Ming-Yu Ge Shu-Xu Yi Li-Ming Song Zheng-Hua An Ce Cai Xin-Qiao Li Wen-Xi Peng Wen-Jun Tan Chen-Wei Wang Xiang-Yang Wen Yue Wang Shuo Xiao Fan Zhang Peng Zhang Shi-Jie Zheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Yunnan Observatories Chinese Academy of SciencesKunming 650011China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100012China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang 550001China College of Electronic and Information Engineering Tongji UniversityShanghai 201804China

As the brightest gamma-ray burst ever observed,GRB 221009A provided a precious opportunity to explore spectral line *** this article,we performed a comprehensive spectroscopy analysis of GRB 221009A jointly with GECAM-C and Fermi/GBM data to search for emission and absorption *** the first time we investigated the line feature throughout this GRB including the most bright part where many instruments suffered problems,and identified prominent emission lines in multiple time *** central energy of the Gaussian emission line evolves from about 37 to 6 MeV,with a nearly constant ratio(about 10%)between the line width and central ***,we find that both the central energy and the energy flux of the emission line evolve with time as a power law decay with power law index of–1 and–2,*** suggest that the observed emission lines most likely origin from the blue-shifted electron positron pair annihilation 511 ke V *** find that a standard high latitude emission scenario cannot fully interpret the observation,thus we propose that the emission line comes from some dense clumps with electron positron pairs traveling together with the *** this scenario,we can use the emission line to directly,for the first time,measure the bulk Lorentz factor of the jet(Γ)and reveal its time evolution(i.e.,Γ~t^(-1))during the prompt ***,we find that the flux of the annihilation line in the co-moving frame keeps *** discoveries of the spectral line features shed new and important lights on the physics of GRB and relativistic jet.

关键词： GRB GRB 221009A emission line

Thromboembolic event rate in patients with persistent or paroxysmal atrial fibrillation post circumferential pulmonary vein isolation:a single center experience in China

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2007年第11期120卷 956-959页

作者： ZHOU Jing-min LIU shao-wen lin Jia-xiong NIE Zhen-ning WU Hong-yi ZHOU Jun HAO Ying CAI Nai-sheng GE Jun-bo Department of Cardiology Zhongshan Hospital Fudan University Shanghai Institute of Cardiovascular Diseases Shanghai 200032 China

Background Pulmonary-vein isolation （PVI） is currently used for the treatment of chronic and paroxysmal atrial fibrillation and a major risk of PVI is thromboembolism. The purpose of this study was to observe embolic event rate in patients with persistent or paroxysmal atrial fibrillation （AF） undergone PVI. Methods Circumferential PVI （CPVI） was performed in 64 consecutive patients with persistent AF （42 men, aged （60.0 ±9.1） years） and in 84 consecutive patients with paroxysmal AF （53 men, aged （61.4±9.3） years）. Warfarin was administrated in all patients before ablation for at least 3 weeks （（5.2±2.6） weeks） and continued for at least 3 months post ablation with international normalized ratio （INR） of 2.0-3.0. During CPVI, intravenous heparin was given at a dose of 5000-8000 U or 75-100 U/kg, followed by 1000 U or 12 U/kg per hour. Results In patients with persistent AF, 1 patient developed embolic event during ablation and 3 patients developed embolic events after ablation. In contrast, no thromboembolic event was observed in patients with paroxysmal AF （4/64 vs 0/84, P=-0. 033）. Conclusion Thromboembolic event rate related to CPVl is significantly higher in patients with persistent AF than that in patients with paroxysmal AF.

关键词： atrial fibrillation catheter ablation thrombosis thromboembolism

Probing the interseismic locking state of the Xianshuihe fault based on a viscoelastic deformation model

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第1期67卷 134-145页

作者： Yage ZHU Faqi DIAO Fei CHEN Yuebing WANG Zhigang shao Rongjiang WANG xiong xiong Hubei Subsurface Multi-Scale Imaging Key Laboratory School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China China Earthquake Networks Center Beijing 100045China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

The interseismic locking state of tectonic faults is essential for regional seismic hazard ***,it is challenging to obtain this parameter reliably due to the weak deformation and complex model *** better probe the fault locking state,more reliable physical models and well-covered observations are *** we investigate the locking state of the Xianshuihe fault based on a new-developed viscoelastic deformation ***,we combine GPS velocities from 13 new near-field stations and existing stations in this region to improve the spatial *** to the theoretical predictions,our results indicate that the elastic model will clearly overestimate the fault locking depth and seismic moment accumulation rate,and the fault slip rate inferred from the elastic model is slightly lower than that from the viscoelastic *** on the locking distribution inferred from the viscoelastic model,we identify four potential asperities on the Xianshuihe *** importantly,we find a clear spatial correlation between the fault locking distribution and the rupture extent of historical earthquakes,which indicates that the fault locking state may control the rupture extent and thus the magnitude of *** addition,our results show that the 2022 M6.8 Luding earthquake only ruptured the south part of a potential asperity,and the accumulated energy in the northern unruptured area is equivalent to an Mw6.9 earthquake,where the seismic hazard deserves special attention.

关键词： Fault kinematics Viscoelastic relaxation effect GPS observations Seismic hazard The 2022 M6.8 Luding earthquake

侯孝贤的“反骨”:从《刺客聂隐娘》看其电影的东方美学意蕴

在线全文

学校读者我要写书评

暂无评论

上海大学学报（社会科学版） 2016年第1期33卷 35-46页

作者：林少雄上海大学上海电影学院上海200072

侯孝贤的电影,始终在以"反电影"的方式进行自己独特的生活观察、生命思考与影像呈现。具体表现为反动为静、反言如默、反虚入实、反西归中、反武以文,从而形成了其影片"无导演的导演"、演员"无表演的表演"、关注"前因后果无情节"的特征... 详细信息

侯孝贤的电影,始终在以"反电影"的方式进行自己独特的生活观察、生命思考与影像呈现。具体表现为反动为静、反言如默、反虚入实、反西归中、反武以文,从而形成了其影片"无导演的导演"、演员"无表演的表演"、关注"前因后果无情节"的特征。这一独特风格及影像叙事语法的形成,既与导演的生活阅历、生命体验、审美趣味密切相关,又与导演对电影艺术本质的体认有关,更与导演所处的华夏民族特有的思维方式及东方文化对人生的洞察理解有关。正因如此,侯孝贤电影以其具有强烈个人风格的人文关怀与浓郁东方美学意蕴的影像表述,在世界电影史上占有了自己的一席之地。

关键词：台湾电影作者电影侯孝贤《刺客聂隐娘》东方美学

在线全文

学校读者我要写书评

暂无评论

陶器时代中国文化艺术中的触觉性

南京大学学报:哲学.人文科学.社会科学 2023年第4期60卷 66-75,160页

作者：林少雄上海大学上海电影学院上海市200072

陶器时代为我们保留了大量关于触觉的文化“文本”,它们不仅构成了中国史前艺术研究的对象,同时也促成了中国早期华夏审美意识的发生,由此也引发了人们关于中国史前艺术“触觉”问题的思考。在陶器时代,人的触觉认知方式不断得以凸显,... 详细信息

陶器时代为我们保留了大量关于触觉的文化“文本”,它们不仅构成了中国史前艺术研究的对象,同时也促成了中国早期华夏审美意识的发生,由此也引发了人们关于中国史前艺术“触觉”问题的思考。在陶器时代,人的触觉认知方式不断得以凸显,手成为触觉重要的认知器官;陶器的材质、工艺、器型、纹饰及功能等方面,都具有鲜明的触觉特质;彩陶的绘制工具、纹饰、器型、功能,也都具有触觉特质。触觉与触觉性问题的提出及其探讨,为中国文化的观察与思考,提供了视觉认知之外一种较为独特的视角、路径、观念或方法,因而有可能获得对中国艺术与美学的全新体认。

关键词：陶器时代彩陶触觉性触觉思维中国文化史前艺术中国美学

在线全文

学校读者我要写书评

暂无评论

丝绸之路的文化意蕴

兰州大学学报（社会科学版） 2018年第2期46卷 1-9页

作者：林少雄上海大学上海电影学院上海200436

丝绸之路不仅仅是物质传播之路,更是人类文化呈现的舞台与文明展示的平台。在此视阈下,丝绸之路的文化意蕴得以不断彰显:世界文明观念重新发现,世界各人种民族不断融合,人类社会各种文明形态开放交流,人类物质文明相互流通,人类语言媒... 详细信息

丝绸之路不仅仅是物质传播之路,更是人类文化呈现的舞台与文明展示的平台。在此视阈下,丝绸之路的文化意蕴得以不断彰显:世界文明观念重新发现,世界各人种民族不断融合,人类社会各种文明形态开放交流,人类物质文明相互流通,人类语言媒介交汇传播,人类观念信仰开拓延展,人类艺术创造相互展示、传播、交流,以及人类思想精神融汇沟通等方面。在这条路上,人类文明空间与时间相互融通、物质与精神齐头并进、人种民族相互融合、宗教与世俗相互适应、文化与艺术相互补充、经济与政治良性互动、战争与和平相互交替,真正具象地释示了"人类命运共同体"这一宏大命题下"人类文明共同体"的细微肌理,因之也具有了不同寻常的文化意蕴。

关键词：丝绸之路一带一路河西走廊文明共同体陶器宗教

在线全文

学校读者我要写书评

暂无评论

父亲的面具:《千里走单骑》的文化底蕴

上海大学学报（社会科学版） 2017年第6期34卷 42-54页

作者：林少雄上海大学上海电影学院上海200444

张艺谋的电影基本上在两个向度上进行思考与探索:一是起源于女阴文化崇拜、以土地为意象的女性文化传统向度;一是起源于男根文化崇拜、以"祖(且)"为意象的男性文化传统向度。张艺谋电影依此两个向度形成了其影像母题的前后两个时期:前... 详细信息

张艺谋的电影基本上在两个向度上进行思考与探索:一是起源于女阴文化崇拜、以土地为意象的女性文化传统向度;一是起源于男根文化崇拜、以"祖(且)"为意象的男性文化传统向度。张艺谋电影依此两个向度形成了其影像母题的前后两个时期:前期主要侧重于对女性的关注,具体表现为对女儿性与母性的讴歌、赞美,对妻性的否定与怀疑以及由此带来的妻性的缺席;后期主要表现为对男性的关注,具体表现为男儿性的悬置,对父性的否定、质疑与对夫性的怀疑,在深层文化观念上,表现出以先祖敬仰为特征的男根崇拜。这两个不同的向度或视阈,在张艺谋《千里走单骑》的影像层面不断延续,并通过如下几个维度得以呈现:通过先祖崇拜及父亲的正面形象塑造,发现中国传统文化的价值内核;通过云南地方戏曲傩戏及其面具的展示寻求到了中国社会民俗文化的外在表征;通过独具匠心的画面摄影展现了现代技术文化的特殊语境;通过与日本演员及主创人员的全面合作,将中国文化的个案放入整个东方文化的视野进行观照。这几个方面在《千里走单骑》中又一次交合际会,不仅体现张艺谋艺术理念、审美视阈、技术思考、个人记忆的强势回归,也标志着张艺谋电影由外爆、外放、外散向内缩、内敛、内忍的转型。

关键词：《千里走单骑》中国电影面具父亲生殖崇拜

在线全文

学校读者我要写书评

暂无评论

纪实影片与执政党之关系论

上海大学学报（社会科学版） 2012年第6期29卷 31-40页

作者：林少雄上海大学影视艺术技术学院上海200072

纪实影片作为大众传播媒介的一种重要形式,从其诞生之初就与执政党及其意识形态发生着密切关系,成为各执政党实行其路线、方针、政策的重要工具与推行意识形态化的重要途径之一。因此,在长期发展中,纪实影片与执政党之间形成了紧密而又... 详细信息

纪实影片作为大众传播媒介的一种重要形式,从其诞生之初就与执政党及其意识形态发生着密切关系,成为各执政党实行其路线、方针、政策的重要工具与推行意识形态化的重要途径之一。因此,在长期发展中,纪实影片与执政党之间形成了紧密而又复杂的联系:纪实影片不仅因成为宣传执政党纲领的重要的文化策略,不断受到执政党的操控,同时作为20世纪具有代表性的大众媒体,纪实影片会对执政党政策及策略产生影响,因此执政党总会想方设法对纪实影片实行不同的操控。

关键词：纪实影片纪录片执政党意识形态