检索结果-南通市图书馆

Scientific objectives and payload configuration of the Chang'E-7 mission

National Science Review 2024年第2期11卷 285-300页

作者： Chi Wang Yingzhuo Jia changbin xue Yangting Lin Jianzhong Liu Xiaohui Fu Lin Xu Yun Huang Yufen Zhao Yigang Xu Rui Gao Yong Wei Yuhua Tang Dengyun Yu Yongliao Zou State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences National Space Science Center Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geochemistry Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space SciencesShandong University Institute of Drug Discovery Technology Ningbo University State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Engineering Sun Yat-sen University Lunar Exploration and Space Engineering Center China Aerospace Science and Technology Corporation

As the cornerstone mission of the fourth phase of the Chinese Lunar Exploration Program, Chang'E-7(CE-7) was officially approved, and implementation started in 2022, including a main probe and a communication relay satellite. The main probe, consisting of an orbiter, a lander, a rover and a mini-flying probe, is scheduled to be launched in 2026. The lander will land on Shackleton crater's illuminated rim near the lunar south pole, along with the rover and mini-flying probe. The relay satellite(named Queqiao-2) will be launched in February 2024 as an independent mission to support relay communication during scientific exploration undertaken by Chang'E-4, the upcoming Chang'E-6 in 2024 and subsequent lunar *** CE-7 mission is mainly aimed at scientific and resource exploration of the lunar south pole. We present CE-7's scientific objectives, the scientific payloads configuration and the main functions for each scientific payload with its key technical specifications.

关键词： Chang’ E-7 scientific objectives scientific payloads

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于嵌入式CPU+GPU异构平台的遥感图像滤波加速

引用

空间科学学报 2024年第1期44卷 95-102页

作者：谭鹏源薛长斌周莉中国科学院国家空间科学中心北京100190 中国科学院大学北京100049

针对遥感图像在轨实时处理提出一种基于嵌入式CPU+GPU异构平台的遥感图像滤波加速设计方法.以加速拉普拉斯滤波为例,利用GPU的并行计算特点,通过数据划分及数据映射的方法对算法进行并行设计;利用GPU的向量单元和缓存等硬件资源,通过采... 详细信息

针对遥感图像在轨实时处理提出一种基于嵌入式CPU+GPU异构平台的遥感图像滤波加速设计方法.以加速拉普拉斯滤波为例,利用GPU的并行计算特点,通过数据划分及数据映射的方法对算法进行并行设计;利用GPU的向量单元和缓存等硬件资源,通过采取向量化和向量重组以及工作组调优方法进一步提高了算法的运行速度.在嵌入式开发板上验证了加速设计的可行性和高效性.实验结果表明,相比于单CPU的串行实现,在增加GPU并行处理后的拉普拉斯滤波获得了4.08~16.92倍的加速比.进一步利用GPU硬件资源优化性能后,加速比可达15.38~56.41倍.

关键词：嵌入式GPU 遥感图像滤波 OpenCL 向量化向量重组

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

小行星防御试验任务科学目标设计与有效载荷配置

引用

深空探测学报（中英文） 2024年第2期11卷 169-176页

作者：邹永廖薛长斌贾瑛卓李明涛徐海涛吕博瀚顾征唐玉华陈琦王赤中国科学院国家空间科学中心北京100190 中国科学院空间天气学国家重点实验室北京100190 北京空间飞行器总体设计部北京100094 国家航天局探月与航天工程中心北京100190 深空探测实验室合肥230026

针对中国首次近地小行星防御在轨验证任务,将对近地小行星撞击地球潜在风险进行防御性处置演示验证,设计并提出小行星防御在轨验证的科学目标及其具体的科学探测任务,开展科学有效载荷需求分析,提出有效载荷配置方案及探测任务要求,为... 详细信息

针对中国首次近地小行星防御在轨验证任务,将对近地小行星撞击地球潜在风险进行防御性处置演示验证,设计并提出小行星防御在轨验证的科学目标及其具体的科学探测任务,开展科学有效载荷需求分析,提出有效载荷配置方案及探测任务要求,为未来实施小行星防御任务提供决策依据。

关键词：小行星防御科学目标有效载荷

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Character Sheaves for Classical Graded Lie Algebras

引用

Acta Mathematica Sinica,English Series 2024年第3期40卷 870-884页

作者： Ting xue School of Mathematics and Statistics University of MelbourneVIC 3010Australia Department of Mathematics and Statistics University of HelsinkiHelsinki 00014Finland

In this note we study character sheaves for graded Lie algebras arising from inner automorphisms of special linear groups and Vinberg’s type Ⅱ classical graded Lie algebras.

关键词： Graded Lie algebras character sheaves Fourier transform nilpotent orbits

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

一种基于轻量化CNN的天文暂现源智能识别方法

引用

空间科学学报 2023年第1期43卷 112-118页

作者：李晓斌薛长斌戴育岐周莉中国科学院国家空间科学中心北京100190 中国科学院大学北京100049

天文暂现源携带了关于天体本质及演化过程的丰富信息,对暂现源进行探测与研究具有极为重要的科学价值。天文暂现源的辐射峰值大多在X射线或伽马射线,天基望远镜对这些高能波段的观测优势是地基望远镜无法比拟的,更适合于暂现源观测。但... 详细信息

天文暂现源携带了关于天体本质及演化过程的丰富信息,对暂现源进行探测与研究具有极为重要的科学价值。天文暂现源的辐射峰值大多在X射线或伽马射线,天基望远镜对这些高能波段的观测优势是地基望远镜无法比拟的,更适合于暂现源观测。但由于星载计算机的性能约束,很难实现依托于地面强大算力的复杂检测算法。针对以上问题,提出了基于轻量化卷积神经网络(CNN)模型的天基暂现源检测算法,并在嵌入式ARM平台上实现了模型部署。实验结果表明,本文提出的轻量化CNN暂现源检测算法的模型复杂度和计算量不及Deep Hits算法的1/4,准确率达到96.52%,可应用于星载有限算力平台,实现未来的天基暂现源实时检测。

关键词：暂现源检测轻量化CNN模型星载有限算力平台模型部署

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高效低功耗低并行度LDPC编码方法

引用

电子与信息学报 2016年第9期38卷 2268-2273页

作者：燕威薛长斌中国科学院国家空间科学中心北京100190 中国科学院复杂航天系统综合电子与信息技术重点实验室北京100190

低密度奇偶校验码(LDPC)是最接近香农极限的纠错码之一,具有优良的性能且被国际通信标准组织广泛采纳为信道编码。CCSDS推荐使用LDPC码作为近地空间和深空探测的信道编码方案。该文提出高效,低功耗,低并行度的LDPC编码方法。该方法通过... 详细信息

低密度奇偶校验码(LDPC)是最接近香农极限的纠错码之一,具有优良的性能且被国际通信标准组织广泛采纳为信道编码。CCSDS推荐使用LDPC码作为近地空间和深空探测的信道编码方案。该文提出高效,低功耗,低并行度的LDPC编码方法。该方法通过采用插"0"和改变循环矩阵的结构实现了对CCSDS标准中推荐的校验矩阵子矩阵大小为奇数的LDPC码的低并行度编码。通过分析编码过程,提出了只对输入信息中的"1"有效信息位进行编码的方案,减少了编码中移位寄存器的移位次数,大幅度地降低了编码器功耗。文中采用FPGA实现了(8176,7154)78LDPC码的编码器,结果显示在硬件开销略有增加的情况下,编码功耗大幅度下降,编码速率接近低并行度编码方案。

关键词：差错控制编码低并行度低功耗 QC—LDPC VLSI设计

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh

引用

Defence Technology（防务技术） 2024年第1期31卷 510-522页

作者： Xin xue Chao Zheng Fu-qiang Lai xue-qian Wu Institute of Metal-rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116China Fujian Metallurgical Industry Design Institute Fuzhou350116China

To explore the wide-frequency damping and vibration-attenuation performances in the application of aerospace components,the cylindrical sandwich shell structure with a gradient core of entangled wire mesh was proposed in this ***,the gradient cores of entangled wire mesh in the axial and radial directions were prepared by using an in-house Numerical Control weaving machine,and the metallurgical connection between skin sheets and the gradient core was performed using vacuum ***,to investigate the mechanical properties of cylindrical sandwich shells with axial or radial gradient cores,quasi-static and dynamic mechanical experiments were carried *** primary evaluations of mechanical properties include secant stiffness,natural frequency,Specific Energy Absorption(SEA),vibration acceleration level,and so *** results suggest that the vibration-attenuation performance of the sandwich shell is remarkable when the high-density core layer is at the end of the shell or abuts the inner *** axial gradient material has almost no influence on the vibration frequencies of the shell,whereas the vibration frequencies increase dramatically when the high-density core layer approaches the ***,compared to the conventional sandwich shells,the proposed functional grading cylindrical sandwich shell exhibits more potential in mass reduction,stiffness designing,and energy dissipation.

关键词： Entangled wire mesh Gradient cylindrical sandwich shell Vacuum brazing Secant stiffness Damping

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Farnesyltransferase inhibitor lonafarnib suppresses respiratory syncytial virus infection by blocking conformational change of fusion glycoprotein

引用

Signal Transduction and Targeted Therapy 2024年第7期9卷 2970-2983页

作者： Qi Yang Bao xue Fengjiang Liu Yongzhi Lu Jielin Tang Mengrong Yan Qiong Wu Ruyi Chen Anqi Zhou Lijie Liu Junjun Liu changbin Qu Qingxin Wu Muqing Fu Jiayi Zhong Jianwei Dong Sijie Chen Fan Wang Yuan Zhou Jie Zheng Wei Peng Jinsai Shang Xinwen Chen Guangzhou National Laboratory Guangzhou 510005China State Key Laboratory of Respiratory Disease Guangzhou Medical UniversityGuangzhou 511436China Wuhan Institute of Virology Chinese Academy of SciencesWuhan 430071China School of Basic Medical Sciences Guangzhou Medical UniversityGuangzhou 511436China GMUGIBH Joint School of Life Sciences Guangzhou Medical UniversityGuangzhou 511436China Guangzhou Institutes of Biomedicine and Health Chinese Academy of SciencesGuangzhou 510530China Shanghai Institute of Materia Medica Chinese Academy of SciencesShanghai 201203China School of Pharmaceutical Science and Technology Hangzhou lnstitute for Advanced StudyUCASHangzhou 310024China

Respiratory syncytial virus(RSV)is the major cause of bronchiolitis and pneumonia in young children and the *** are currently no approved RSV-specific therapeutic small molecules *** high-throughput antiviral screening,we identified an oral drug,the prenylation inhibitor lonafarnib,which showed potent inhibition of the RSV fusion *** exhibited antiviral activity against both the RSV A and B genotypes and showed low cytotoxicity in HEp-2 and human primary bronchial epithelial cells(HBEC).Time-of-addition and pseudovirus assays demonstrated that lonafarnib inhibits RSV entry,but has farnesyltransferase-independent antiviral ***-electron microscopy revealed that lonafarnib binds to a triple-symmetric pocket within the central cavity of the RSV F metastable pre-fusion *** at the RSV F sites interacting with lonafarnib showed resistance to lonafarnib but remained fully sensitive to the neutralizing monoclonal antibody ***,lonafarnib dose-dependently reduced the replication of RSV in BALB/c ***,lonafarnib could be a potential fusion inhibitor for RSV infection.

关键词： neutral metastable approved

来源：

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

Linear Quadratic Optimal Control for Systems Governed by First-Order Hyperbolic Partial Differential Equations

引用

Journal of Systems Science & Complexity 2024年第1期37卷 230-252页

作者： xue Xiaomin XU Juanjuan ZHANG Huanshui School of Control Science and Engineering Shandong UniversityJinan 250061China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266000China

This paper focuses on linear-quadratic(LQ)optimal control for a class of systems governed by first-order hyperbolic partial differential equations(PDEs).Different from most of the previous works,an approach of discretization-then-continuousization is proposed in this paper to cope with the infinite-dimensional nature of PDE *** contributions of this paper consist of the following aspects:(1)The differential Riccati equations and the solvability condition of the LQ optimal control problems are obtained via the discretization-then-continuousization method.(2)A numerical calculation way of the differential Riccati equations and a practical design way of the optimal controller are ***,the relationship between the optimal costate and the optimal state is established by solving a set of forward and backward partial difference equations(FBPDEs).(3)The correctness of the method used in this paper is verified by a complementary continuous method and the comparative analysis with the existing operator results is *** is shown that the proposed results not only contain the classic results of the standard LQ control problem of systems governed by ordinary differential equations as a special case,but also support the existing operator results and give a more convenient form of computation.

关键词： Discretization-then-continuousization method first-order hyperbolic partial differential equations forward and backward partial difference equations linear quadratic optimal control.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermodynamic property of sandwich cylindrical shell structure with metallic wire mesh:Numerical modeling and experimental analysis

引用

Chinese Journal of Aeronautics 2024年第1期37卷 138-152页

作者： Xin xue Guojian SHEN Juan LIAO Institute of Metal Rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350116China Fujian Shuikou Power Generation Group Co. LTDFuzhou 350000China

As a new addition to lightweight composite structures,the sandwich cylindrical shell with a metallic wire mesh core has emerged as a promising solution for thermodynamic performance analysis at elevated *** intricate interwoven cellular formations within the metallic wire mesh pose difficulties for thermo-mechanical modeling and property ***,the constitutive models employed to characterize hysteresis phenomena were presented,comprising isotropic elasticity,Bergstrom-Boyce model,Ogden hyper-elasticity,and parameter identification through mechanical examinations at varying ***,the finite element modeling of cylindrical shell structures was determined for modal and steady-state dynamic ***,the experimental procedures were carried out,including the preparation of the sandwich cylindrical shell and the dynamic testing *** first-order natural frequency of the cylindrical shell structure is close to the resonance frequency of the dynamic test results,with a maximum error of 6.5%,demonstrating the accuracy of the simulation *** compared to the solid-core cylindrical shell,the average insertion loss of the sandwich cylindrical shell structure within the frequency range of 10–1000 Hz at room temperature is up to 11.09 ***,at elevated temperatures,the average insertion loss of the sandwich cylindrical shell decreases but fluctuates as the temperature changes.

关键词： Energy dissipation Metallic matrix composites Numerical analysis Sandwich structure Thermodynamic properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：