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Fast bowtie effect elimination for MODIS L1B data

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The Journal of China Universities of Posts and Telecommunications 2010年第1期17卷 120-126页

作者： REN Rui-zhi,guo Shu-xu,GU Ling-jia College of electronic science and engineering,Jilin University,Changchun 130012,China College of electronic science and engineering Jilin University Changchun 130012 China

The bowtie effect refers to geometry distortions for the moderate resolution imaging spectrum-radiometer （MODIS） level 1B （L1 B） data. Till now, to eliminate the bowtie effect, numerous methods are proposed. However, most of them have limitations in computation efficiency. Through a comparative study of existing methods, this article puts forward a fast method to eliminate the bowtie effect using the ephemeris data. In this method, the rough positions of overlapping data are first detected. Because of the influence caused by the instrarnent characters and the earth＇s curvature, the positions of overlapping data need to be rectified to obtain more precise results. The optimal rectification method used in this article is selected by comparing three methods. By using the optimal method, the rectified MODIS data can be obtained. The experiments demonstrate that the bowtie effect can be eliminated in less than 1 s. In contrast, other traditional methods spend at least 3 s, thus the proposed method is faster and more effective.

关键词： bowtie effect MODIS bilinear interpolation overlapping data rectification

Transverse emittance measurement for the heavy ion medical machine cyclotron

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Nuclear Science and Techniques 2019年第12期30卷 103-110页

作者： Yong-Chun Feng Min Li Rui-Shi Mao Bing Wang Sheng-Peng Li Wei-Long Li Wei-Nian Ma Xin-Cai Kang Jin-Quan Zhang Peng Li Tie-Cheng Zhao zhi-guo xu You-Jin Yuan Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Lanzhou Ke jin tai ji Corporation LTDLanzhou 730000China Lanzhou University of Technology Lanzhou 730050China

The transverse emittance of the extracted beam from the heavy ion medical machine cyclotron is measured and then optimized for injection into the *** the purposes of cross-validation,three methods,i.e.,slit-grid,Q-scan,and 3-grid,are used to measure the *** the slit-grid technique,an automatic selection of the region of interest is adopted to isolate the major noise from the beam phase space,which is an improvement over the traditional *** iterating over the contour level,an unbiased measurement of the emittance can be *** improvement in the thin lens technique is implemented in the Q-scan *** results of these measurements are presented.

关键词： Heavy ion medical machine Transverse emittance Slit-grid

Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi Ding Zhe Sui Hong Su xu guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

Reducing the measurement errors in nonadiabatic holonomic quantum computers

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 64-70页

作者： guo-Fu xu Department of Physics Shandong University

Nonadiabatic holonomic quantum computers serve as the physical platform for nonadiabatic holonomic quantum *** quantum computation has entered the noisy intermediate-scale era, building accurate intermediate-scale nonadiabatic holonomic quantum computers is clearly necessary. Given that measurements are the sole means of extracting information, they play an indispensable role in nonadiabatic holonomic quantum computers. Accordingly, developing methods to reduce measurement errors in nonadiabatic holonomic quantum computers is of great importance. However, while much attention has been given to the research on nonadiabatic holonomic gates, the research on reducing measurement errors in nonadiabatic holonomic quantum computers is severely lacking. In this study, we propose a measurement error reduction method tailored for intermediate-scale nonadiabatic holonomic quantum computers. The reason we say this is because our method can not only reduce the measurement errors in the computer but also be useful in mitigating errors originating from nonadiabatic holonomic gates. Given these features,our method significantly advances the construction of accurate intermediate-scale nonadiabatic holonomic quantum computers.

关键词： quantum holonomy quantum computation measurement errors

用探针粒子示踪微流变法测量明胶的动态不均匀性

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高分子学报 2017年第9期27卷 1488-1496页

作者：洪伟许国智孙尉翔童真华南理工大学材料科学研究所广州510640

利用探针粒子示踪微流变法对明胶溶液等温凝胶化过程的动态不均匀性进行了观测.通过向体系中引入探针粒子,利用广义的Stokes-Einstein关系由探针粒子的位移建立了体系结构的空间分布.进而利用van Hove函数和非高斯因子描述了凝胶化转变... 详细信息

利用探针粒子示踪微流变法对明胶溶液等温凝胶化过程的动态不均匀性进行了观测.通过向体系中引入探针粒子,利用广义的Stokes-Einstein关系由探针粒子的位移建立了体系结构的空间分布.进而利用van Hove函数和非高斯因子描述了凝胶化转变前后动态不均匀性的变化,结果表明在凝胶化后体系动态在空间和时间尺度上都是不均匀的,与凝胶化前相比,凝胶化后的快动态有更高的贡献.为了进一步探究这种动态不均匀性在空间和时间上相关的变化,本工作在粒子示踪技术的基础上,实现了四点相关函数和极化率的测量.实验结果表明,凝胶化前体系的快松弛可以原位独立完成,而慢松弛则需要周围的结构单元协同完成;凝胶化后体系的快松弛和慢松弛均需要协同完成.

关键词：凝胶化动态不均匀性 van Hove函数四点极化率

Towards the full realization of the RIBLL2 beam line at the HIRFL-CSR complex

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Science Bulletin 2018年第2期63卷 78-80页

作者： Bao-Hua Sun Jian-Wei Zhao xue-Heng Zhang Li-Na Sheng zhi-Yu Sun Isao Tanihata Satoru Terashima Yong Zheng Li-Hua Zhu Li-Min Duan Liu-Chun He Rong-Jiang Hu Guang-Shuai Li Wen-Jian Lin Wei-Ping Lin Chuan-Ye Liu Zhong Liu Chen-Gui Lu Xin-Wen Ma Li-Jun Mao Yi Tian Feng Wang Meng Wang Shi-Tao Wang Jia-Wen Xia Xiao-Dong xu Hu-Shan xu zhi-guo xu Jian-Cheng Yang Da-Yu Yin You-Jin Yuan Wen-Long Zhan Yu-Hu Zhang Xiao-Hong Zhou School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China International Research Center for Nuclei and Particles in the Cosmos Beijing 100191 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

More than 99%of the mass in the visible universe—the material that makes up ourselves,our planet,stars—is in the atomic *** the matter has existed for billions of years,only over the past few decades have we had the tools and the knowledge necessary to get a basic understanding of the structure and dynamic of *** physicists around the world have made tremendous strides by initiating a broad range of key

关键词： HIRFL-CSR 横梁建筑群排队原子核物理学家试验性世界

Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng xu Sheng Pang Liangwei Cong guoyu Qian Dong Wang Laishi Li Yusheng Wu zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

聚乙烯醇／半纤维素／纤维素纳米晶复合膜的制备和性能

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高分子学报 2016年第11期26卷 1615-1620页

作者：胡宇孙辉杨彪黄斌徐国志北京工商大学材料与机械工程学院国家塑料制品质量监督检验中心北京100048

通过碱解醇沉法从玉米芯中提取半纤维素,进而采用溶液共混流延法制备出不同比例的聚乙烯醇(PVA)/半纤维素共混膜,在此基础上加入通过硫酸水解脱脂棉制备的纤维素纳米晶(NCC),制备了NCC增强的复合膜.DSC、TGA、FTIR、SEM和薄膜拉伸等研... 详细信息

通过碱解醇沉法从玉米芯中提取半纤维素,进而采用溶液共混流延法制备出不同比例的聚乙烯醇(PVA)/半纤维素共混膜,在此基础上加入通过硫酸水解脱脂棉制备的纤维素纳米晶(NCC),制备了NCC增强的复合膜.DSC、TGA、FTIR、SEM和薄膜拉伸等研究表明,复合膜的各组分间形成了氢键作用,相容性良好.在PVA/半纤维素共混膜中,半纤维素的加入大幅度提高了复合膜的断裂伸长率:当PVA与半纤维素质量比为3∶1时,复合膜的断裂伸长率高达380%,比纯PVA的140%增加了1.7倍,而拉伸强度仍能保持在较高的水平;纤维素纳米晶的加入,还可改善复合膜的韧性;半纤维素对PVA组分的结晶性能产生了影响,而刚性结构的NCC则对PVA的结晶起抑制作用.此外半纤维素和NCC的引入也提高了复合膜的热性能,使第二阶段分解速率峰的温度提高了约50℃.

关键词：纳米纤维素晶须半纤维素复合膜热稳定性结晶度裂伸长率

无缝线透明角膜切口白内障超声乳化术后抗生素眼药膏进入前房1例(英文)

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国际眼科杂志 2011年第8期11卷 1318-1320页

作者：郝胜利刘志恒高志国徐国志中国天津市大港医院眼科天津医科大学临床医学院附属医院 300270

目的:报告无缝线透明角膜切口白内障超声乳化术后抗生素眼药膏进入前房的病例1例。方法:患者,男,62岁,行透明角膜切口白内障超声乳化联合人工晶状体植入术,术中顺利。术毕使用抗生素类固醇眼药膏,术眼给予加压包扎。术后第1d,观察到一... 详细信息

目的:报告无缝线透明角膜切口白内障超声乳化术后抗生素眼药膏进入前房的病例1例。方法:患者,男,62岁,行透明角膜切口白内障超声乳化联合人工晶状体植入术,术中顺利。术毕使用抗生素类固醇眼药膏,术眼给予加压包扎。术后第1d,观察到一油滴状物漂浮于前房,紧急行手术清除前房内进入的眼药膏,未置换人工晶状体。结果:前房灌洗及清除油滴状物后,随访6mo,视力及眼压均保持稳定,前房结构稳定,无炎症反应。结论:眼药膏可通过不稳定的透明角膜切口进入前房。通过本病例应该认识到,白内障切口及其完整性非常重要,使用眼药膏后术眼给予加压包扎有一定的风险。

关键词：抗生素眼药膏前房白内障超声乳化术