检索结果-南通市图书馆

Journal of Systems Science & Complexity 2012年第2期25卷 410-416页

作者： jinghong liu Yijun DENG Qiding ZHU Ningbo Institute of Technology Zhejiang University Department of Mathematics Hunan International Economics College College of Mathematics and Computer Science Hunan Normal University

For a general second-order variable coefficient elliptic boundary value problem in three dimensions, the authors derive the weak estimate of the first type for tensor-product linear pentahedral finite elements. In addition, the estimate for the W1,1-seminorm of the discrete derivative Green＇s function is given. Finally, the authors show that the derivatives of the finite element solution uh and the corresponding interpolant Hu are superclose in the pointwise sense of the L∞-norm.

关键词： Discrete derivative Green's function superconvergence tensor-product linear pentahedralfinite elements variable coefficient elliptic problem.

Multi-exposure fusion for high dynamic range scene

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2017年第4期23卷 343-349页

作者： Shen Xiaohe liu jinghong Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of SciencesChangchun 130033P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Beijing Institute of Aerospace Control Devices Beijing 100039P.R.China

Due to the existing limited dynamic range a camera cannot reveal all the details in a high-dynamic range scene. In order to solve this problem,this paper presents a multi-exposure fusion method for getting high quality images in high dynamic range scene. First,a set of multi-exposure images is obtained by multiple exposures in a same scene and their brightness condition is analyzed. Then,multi-exposure images under the same scene are decomposed using dual-tree complex wavelet transform( DT-CWT),and their low and high frequency components are obtained. Weight maps according to the brightness condition are assigned to the low components for fusion. Maximizing the region Sum Modified-Laplacian( SML) is adopted for high-frequency components fusing. Finally,the fused image is acquired by subjecting the low and high frequency coefficients to inverse *** results show that the proposed approach generates high quality results with uniform distributed brightness and rich details. The proposed method is efficient and robust in varies scenes.

关键词： multi-exposure fusion high dynamic range scene dual-tree complex wavelet transform(DT-CWT) brightness analysis

Simulation of annealing process effect on texture evolution of deep-drawing sheet Stl5

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2005年第6期12卷 512-516页

作者： jinghong Sun Yazheng liu Leyu Zhou Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

A two-dimensional cellular automaton method was used to simulate grain growth during the recrystallization annealing of deep-drawing sheet St 15, taking the simulated result of recrystallization and the experimental result of the annealing texture of deepdrawing sheet St15 as the initial condition and reference. By means of computer simulation, the microstructures and textures of different periods of grain growth were predicted. It is achieved that the grain size, shape and texture become stable after the grain growth at a constant temperature of 700℃ for 10 h, and the advantaged texture components { 111 } 〈 110 〉 and { 111 } 〈 112〉 are dominant.

关键词： cellular automaton deep-drawing sheet texture simulation

Superconvergence of tricubic block finite elements

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2009年第5期52卷 959-972页

作者： liu jinghong SUN HaiNa ZHU QiDing Department of Fundamental Courses Ningbo Institute of TechnologyZhejiang UniversityNingbo 315100China School of Mathematics and Computer Science Hunan Normal UniversityChangsha 410081China

In this paper, we first introduce interpolation operator of projection type in three dimen- sions, from which we derive weak estimates for tricubic block finite elements. Then using the estimate for the W 2, 1-seminorm of the discrete derivative Green's function and the weak estimates, we show that the tricubic block finite element solution uh and the tricubic interpolant of projection type Πh3u have superclose gradient in the pointwise sense of the L∞-norm. Finally, this supercloseness is applied to superconvergence analysis, and the global superconvergence of the finite element approximation is derived.

关键词： block finite element interpolation operator of projection type superconvergence supercloseness weak estimate discrete derivative Green’s function 65N30

TLE orbit determination using simplex method

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2023年第5期14卷 438-455页

作者： jinghong liu Wanting Long Yunchen Wu Jin Xu Jizhang Sang Xiangxu Lei School of Smart City Chongqing Jiaotong UniversityChongqing 400074China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China School of Civil and Architecture Engineering Shandong University of TechnologyZibo 255000China

Two-Line Element(TLE)datasets are the only orbital data source of Earth-orbiting space objects for many civil users for their research and *** datasets have uneven qualities that may affect the reliability of the propagated positions of space objects using a single *** least squares approach to use multiple TLEs also suffers from the poor quality of some TLEs,and reliable error information cannot be *** paper proposes a simplex algorithm to estimate an optimal TLE from multiple TLEs and obtain the uncertainty of each *** is a derivative-free technique that can deal with various orbit *** have demonstrated that using the TLE estimated from the simplex method is more reliable,stable,and effective than those from the batch least squares *** an application example,the optimal TLE and its uncertainty are used for predicting the fallen area,keeping the actual fallen site in the prediction areas.

关键词： Two-line element Reentry prediction Orbit determination Simplex method Least squares

Enterprise Information System Architecture Based on Web 2.0

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2006年第5期11卷 1398-1402页

作者： YI Xiushuang WANG Yu liu jinghong WEN Zhankao Network Center Northeastern University Shenyang110004 Liaoning China Software College Northeastern University Shenyang110004 Liaoning China

Enterprise information systems with a great use of Web 2.0 technologies will be more open, free, and more efficient. With the contrast between classic Web technologies and Web 2.0 technologies, we represent a sample of enterprise information system based on Web 2.0, and show how the use of Web 2. 0 technologies changes the system data exchange model of the enterprise information systems and how it improves the efficiency and effectiveness of information systems.

关键词： Web 2. 0 information system architecture

June Festival in Qinghai

在线全文

学校读者我要写书评

暂无评论

China's Tibet 1994年第3期5卷 26-29页

作者： Xiao Zhenwei and liu jinghong

Each June,Tibetans living in some 50 Tibetan villages|on the banks of the Rong-wu River meet for several days in Regong to celebrate the June *** is one of the major cultural areas in the Huang-nan Tibetan Autonomous ... 详细信息

关键词： Qinghai

The chromosome-level Hemerocallis citrina Borani genome provides new insights into the rutin biosynthesis and the lack of colchicine

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

Horticulture Research 2021年第1期8卷 1200-1209页

作者： Zhixing Qing jinghong liu Xinxin Yi Xiubin liu Guoan Hu Jia Lao Wei He Zihui Yang Xiaoyan Zou Mengshan Sun Peng Huang Jianguo Zeng Hunan Key Laboratory of Traditional Chinese Veterinary Medicine Hunan Agricultural UniversityChangshaHunan 410128China College of Veterinary Medicine Hunan Agricultural UniversityChangshaHunan 410128China Wuhan Frasergen Bioinformatics Co. LtdWuhanHubei 430075China College of Animal Science and Technology Hunan Agricultural UniversityChangshaHunan 410125China Green Melody Bio-engineering Group Company Limited ChangshaHunan 410329China National and Local Union Engineering Research Center of Veterinary Herbal Medicine Resource and Initiative Hunan Agricultural UniversityChangsha 410128China

Hemerocallis citrina Borani(huang hua cai in Chinese)is an important horticultural crop whose flower buds are widely consumed as a delicious vegetable in *** we assembled a high-quality reference genome of *** using single-molecule sequencing and Hi-C *** genome assembly was 3.77 Gb and consisted of 3183 contigs with a contig N50 of 2.09 Mb,which were further clustered into 11 pseudochromosomes.A larger portion(3.25 Gb or 86.20%)was annotated as a repetitive content and 54,295 protein-coding genes were annotated in the *** evolution analysis showed that *** experienced a recent whole-genome duplication(WGD)event at~15.73 million years ago(Mya),which was the main factor leading to many multiple copies of orthologous *** used this reference genome to predict 20 genes involved in the rutin biosynthesis ***,our metabolomics data revealed neither colchicine nor its precursors in ***,challenging the long-standing belief that this alkaloid causes poisoning by the *** results of our disruptive research are further substantiated by our genomic finding that *** does not contain any genes involved in colchicine *** high-quality genome lays a solid foundation for genetic research and molecular breeding of ***.

关键词： insight alkaloid neither

危机生成的“关系”范畴:欧洲生育危机叙事演变

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

广东社会科学 2022年第6期 212-225页

作者：柳静虹南开大学周恩来政府管理学院社会工作与社会政策系天津300350

在生育危机被普遍谈及的当下,危机概念为我们认识生育本质及其实践内在复杂性提供一个批判性的反思空间。本文应用关系的本体论范畴初步构建了理解生育危机叙事的一般框架,聚焦危机的意义再造,分析17世纪以来欧洲生育危机的知识生成,并... 详细信息

在生育危机被普遍谈及的当下,危机概念为我们认识生育本质及其实践内在复杂性提供一个批判性的反思空间。本文应用关系的本体论范畴初步构建了理解生育危机叙事的一般框架,聚焦危机的意义再造,分析17世纪以来欧洲生育危机的知识生成,并区分“人口”与“普通人”两条叙事轴线,由此阐明危机化的体系与事件取向。研究揭示,生育危机是主体逻辑的差别效应,即体系化下对因果关联的确定性追溯,以及事件取向下确定性之外的个体自觉应对。这需要政策实践着眼主体逻辑的多样性及其异质性认识,而非危机意涵的同质化,注重公共交流的关系转向。本研究旨在增进决策者、学者与普通大众之间的立场对话,推动对于理解的理解转变。

关键词：欧洲生育危机主体社会属性

社会政策变革:一个认知社会学分析框架的提出

在线全文

学校读者我要写书评

暂无评论

广东社会科学 2024年第3期 224-239页

作者：柳静虹南开大学社会学院社会工作与社会政策系天津300350

变革是政策研究的一个经典议题。本文尝试在认知社会学视域下发展一种解释社会政策变革的认知分析方法,探究变革背后政策的认知过程,明晰政策变革的内在逻辑。长期以来,政策研究大多集中于对变革的外生解释,倾向政策的内稳态假设,对变... 详细信息

变革是政策研究的一个经典议题。本文尝试在认知社会学视域下发展一种解释社会政策变革的认知分析方法,探究变革背后政策的认知过程,明晰政策变革的内在逻辑。长期以来,政策研究大多集中于对变革的外生解释,倾向政策的内稳态假设,对变革的内生性根源的思考相对受限。认知社会学为解释政策的变革提供了一个前沿“解题”思路:政策变革基于众多缘由,但变革必然通过政策的认知调整来实现。基于此,本文发展了聚焦政策认知过程的认知分析框架,从理论立场、基本假设和分析要素三方面进行具体的理论提出。政策认知分析框架为政策变革研究提供了一般意义上的理论解释,其边际贡献在于将政策变革理论拓展为一种聚焦社会制度反身性的社会理论,阐明社会政策作为社会的认知系统及其对现实赋意的多极建构,揭示了政策变革伴随的政策认知过程动态。本文对政策认知过程的关注,也为理解政策变革与其思想、话语转变之间的关联提供了一个衔接的理论观点,为发展政策的强认知分析方法提供了一个讨论的起点。

关键词：变革社会政策认知分析认知社会学