检索结果-南通市图书馆

How to Recognize Nonexpansive mappings and Isometric mappings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta mathematica Sinica,English Series 2011年第10期27卷 1959-1966页

作者： Guang Gui DING Yu mei ma School of mathematical Sciences and LPMC Nankai University Tianjin 300071 P. R. China Department of Applied mathematics Dalian Nationality University Liaoning 116600 P. R. China

In two real Banach spaces, we shall present two conditions, under one of which each nonexpansive mapping must be an isometry.

关键词： Nonexpansive mapping smooth point weak*-compact set

A new stabilizing method for linear aperiodic sampled-data systems with time delay inputs and uncertainties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第4期63卷 224-226页

作者： Shuangshuang GAO xiu YOU Xinchun JIA Weiwei ma School of mathematical Sciences Shanxi University

Dear editor,With the rapid development of communication,control, and computer technologies, networked control systems (NCSs) have been widely used in various fields owing to its advantages of sharing information resources, reducing system wiring,and increasing the flexibility and reliability of systems [1–3]. In NCSs, sampling-data systems com-

关键词： A new stabilizing method for linear aperiodic sampled-data systems with time delay inputs and uncertainties

Novel combined shield design for eye and face protection from COVID-19

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in manufacturing 2021年第1期9卷 130-135页

作者： xiu-Ling Huang Jin-Rong Yang Yu-Xiang Sun Yi-Wen Chen xiu-mei Wang Shui-Miao Du Zi-Kai Hua School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People's Republic of China Sino European School of Technology of Shanghai University Shanghai 200444People's Republic of China

The World Health Organization emphasized the importance of goggles and face shields for protection of medical personnel at the outbreak of the COVID-19 ***,almost all countries suffered from a critical supply shortage of goggles and face shields,as well as many other types of personal protective equipment(PPE),for a long period,owing to the lack of key medical material supplies and the inefficiency of existing fabrication methods arising from the need to avoid crowds during the outbreak of *** this paper,we propose a novel combined shield design for eye and face protection that can be rapidly fabricated using three-dimensional printing *** designed prototype eye-face shield is accessible to the general public,offering more possibilities for yield improvement in PPE during emergent infectious disease events such as COVID-19.

关键词： Goggles Face shield Three-dimensional(3D)printing COVID-19

SwinFusion: Cross-domain Long-range Learning for General Image Fusion via Swin Transformer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1200-1217页

作者： Jiayi ma Linfeng Tang Fan Fan Jun Huang Xiaoguang mei Yong ma The authors are with the Electronic Information School Wuhan UniversityWuhan 430072China IEEE

This study proposes a novel general image fusion framework based on cross-domain long-range learning and Swin Transformer,termed as *** the one hand,an attention-guided cross-domain module is devised to achieve sufficient integration of complementary information and global *** specifically,the proposed method involves an intra-domain fusion unit based on self-attention and an interdomain fusion unit based on cross-attention,which mine and integrate long dependencies within the same domain and across *** long-range dependency modeling,the network is able to fully implement domain-specific information extraction and cross-domain complementary information integration as well as maintaining the appropriate apparent intensity from a global *** particular,we introduce the shifted windows mechanism into the self-attention and cross-attention,which allows our model to receive images with arbitrary *** the other hand,the multi-scene image fusion problems are generalized to a unified framework with structure maintenance,detail preservation,and proper intensity ***,an elaborate loss function,consisting of SSIM loss,texture loss,and intensity loss,drives the network to preserve abundant texture details and structural information,as well as presenting optimal apparent *** experiments on both multi-modal image fusion and digital photography image fusion demonstrate the superiority of our SwinFusion compared to the state-of-theart unified image fusion algorithms and task-specific *** code and pre-trained weights can be accessed at https://***/Linfeng-Tang/SwinFusion.

关键词： Cross-domain long-range learning image fusion Swin transformer

Polyoxometalate-based ionic liquids-promoted CO_2 conversion

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第5期59卷 507-516页

作者： mei-Yan Wang Ran ma Liang-Nian He State Key Laboratory and Institute of Elemento-Organic Chemistry Collaborative Innovation Center of Chemical Science and Engineering Nankai University

Polyoxometalates(POMs) are a class of molecular metal oxides, showing numerous applications in various chemical processes due to their unique acid/base and redox features. By adjusting the tunable molecular structures of the anions and counter cations, plenty of POM-based ionic liquids(POM-based ILs) have been fabricated to be used in various fields, such as catalysis, structural chemistry and material science. As a class of excellent catalysts, POM-based ILs have shown advantages in the emerging field of CO_2 utilization such as CO_2 capture, cycloaddition of CO_2 to epoxides, and reduction of CO_2, owing to the efficient activation of CO_2 by POM anions. This review summarizes recent advances in the catalysis of POM-based ILs, and particularly highlights the areas that are related to CO_2 conversion.

关键词： ionic liquid catalysis CO2 conversion polyoxometalate

Linear Integral Analysis of Bar Rough Rolling by Strain Rate Vector

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第3期17卷 28-33页

作者： DENG Wei ZHAO De-wen QIN Xiao-mei GAO xiu-hua DU Lin-xiu LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A new linear integral method for bar hot rolling on roughing train was obtained. First, for plastic deformation energy rate, equivalent strain rate about Kobayashi＇s three-dimensional velocity field was expressed by two-dimensional strain rate vector; then, the two-dimensional strain rate vector was inverted into inner product and was integrated term by term. During those processes, boundary equation and mean value theorem were introduced; for friction and shear energy dissipation rate, definite integral was applied to the solution process. Sequentially, the total upper bound power was minimized, and the analytical expressions of rolling torque, separating force, and stress state factor were obtained. The calculated results by these expressions were compared with those of experimental values. The results show that the new linear integral method is available for bar rough rolling analysis and the calculated results by this method are a little higher than those of experimental ones. However, the maximum error between them is less than 10%.

关键词： bar rough rolling linear integration strain rate vector roll separating force

New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： mei ShengWei ma Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

Effective Virtual Reality Based Building Navigation Using Dynamic Loading and Path Optimization

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2009年第4期6卷 335-343页

作者： Qing-Jin Peng xiu-mei Kang Ting-Ting Zhao Department of Mechanical and manufacturing Engineering University of Manitoba Winnipeg R3T 5V6 Canada

Although computer capabilities have been improved significantly, a large-scale virtual reality （VR） system demands much more in terms of memory and computation than the current computer systems can offer. This paper discusses two important issues related to VR performance and applications in building navigation. These are dynamic loading of models based on cell segmentation for the optimal VR operation, and the route optimization based on path planning for easy navigation. The VR model of engineering and information technology complex （EITC） building at the University of manitoba is built as an example to show the feasibility of the proposed methods. The reality, enhanced by three-dimensional （3D） real-time interactivity and visualization, leads navigators into a state of the virtual building immersion.

关键词： Virtual reality (VR) virtual environments (VEs) building navigation dynamic loading cell segmentation path planning

Comparison of bone regeneration in alveolar bone of dogs on mineralized collagen grafts with two composition ratios of nanohydroxyapatite and collagen

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2016年第1期3卷 33-40页

作者： Yan-FuWang Cheng-Yue Wang PengWan Shao-GangWang xiu-mei Wang Graduate School Liaoning Medical UniversityJinzhou 121000China Department of Prosthodontics Affiliated Stomatological Hospital of Liaoning Medical UniversityJinzhou 121000China Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute for Regenerative Medicine and Biomimetic materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

To study the effect of two composition ratios of nano-hydroxyapatite and collagen(NHAC)composites on repairing alveolar bone defect of *** healthy adult dogs were randomly divided into three *** kinds of the NHAC composites were prepared according to the constituent ratios of 3:7 and 5:5;immediately after extraction of the mandibular second premolars,each kind of the NHAC composite was implanted into extraction socket,respectively:Group I,nHA/Col紏3:7;Group II,nHA/Col紏5:5 and Group III,blank control *** bone-repairing ability of the two grafts was separately analyzed by morphometric measurement,X-ray tomography examination and biomechanical analysis at 1st,3rd and 6th month post-surgical,*** NHAC composites were absorbed gradually after implanting into alveolar bone defect and were replaced by new *** ratios of new bone formation of Group I was significantly higher than that of Group II after 3 months(Pmance can be improved when the ratio between the collagen and the hydroxyapatite was reasonable,and the repairing ability and effect in extraction sockets are obviously better.

关键词： nano-hydroxyapatite collagen dental extraction socket alveolar ridge preservation ratios