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Deformation in locally convex topological linear spaces

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Science China Mathematics 2004年第5期47卷 687-710页

作者： ding Yanheng Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100080 China

We are concerned with a deformation theory in locally convex topological linear spaces. A special 'nice' partition of unity is given. This enables us to construct certain vector fields which are locally Lipschitz continuous with respect to the locally convex topology. The existence, uniqueness and continuous dependence of flows associated to the vector fields are established. Deformations related to strongly indefinite functionals are then obtained. Finally, as applications, we prove some abstract critical point theorems.

关键词： locally convex topology, deformation, critical point.

Generation of patient-specific motor neurons in modeling movement diseases

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Neural Regeneration Research 2021年第9期16卷 1799-1800页

作者： Baojin ding Department of Biology University of Louisiana at LafayetteLafayetteLAUSA

Generating neurons from human induced pluripotent stem cells(hiPSCs) overcomes the limited access to human brain tissues and greatly facilitates the research in neuroscience(Karagiannis et al., 2019).

关键词： Generation overcome movement

Opportunities and challenges for the biodegradable magnesium alloys as next-generation biomaterials

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Regenerative Biomaterials 2016年第2期3卷 79-86页

作者： Wenjiang ding Shanghai Jiao Tong University Shanghai 200240China

In recent years,biodegradable magnesium alloys emerge as a new class of biomaterials for tissue engineering and medical *** biodegradable magnesium-based materials not only avoids a second surgical intervention for implant removal but also circumvents the long-term foreign body effect of permanent ***,these materials are often subjected to an uncontrolled and fast degradation,acute toxic responses and rapid structural failure presumably due to a localized,too rapid corrosion *** patented Mg-Nd-Zn-based alloys(JiaoDa BioMg[JDBM])have been developed in Shanghai Jiao Tong University in recent *** alloy series exhibit lower biodegradation rate and homogeneous nanophasic degradation patterns as compared with other biodegradable Mg *** in vitro cytotoxicity tests using various types of cells indicate excellent biocompatibility of ***,bone implants using JDBM-1 alloy and cardiovascular stents using JDBM-2 alloy have been successfully fabricated and in vivo long-term assessment via implantation in animal model have been *** results confirmed the reduced degradation rate in vivo,excellent tissue compatibility and long-term structural and mechanical ***,this novel Mg-alloy series with highly uniform nanophasic biodegradation represent a major breakthrough in the field and a promising candidate for manufacturing the next generation biodegradable implants.

关键词： biodegradable material magnesium alloys uniform corrosion orthopaedic implants cardiovascular stents

Whittle’s Index Based Sensor Scheduling for Multiprocess Systems Under DoS Attacks

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Journal of Systems Science & Complexity 2024年第1期37卷 329-350页

作者： CAI Zai ding Kemi Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China.

In this paper,the authors consider how to design defensive countermeasures against DoS attacks for remote state estimation of multiprocess *** each system,a sensor will measure its state and transmits the data packets through an unreliable channel which is vulnerable to be jammed by an *** limited communication bandwidth,only a subset of sensors are allowed for data transmission,and how to select the optimal one to maximize the accuracy of remote state estimation is the focus of the proposed *** authors first formulate this problem as a Markov decision process and investigate the existence of optimal ***,the authors demonstrate the piecewise monotonicity structure of optimal *** the difficulty of obtaining an optimal policy of large-scale problems,the authors develop a suboptimal heuristic policy based on the aforementioned policy structure and Whittle’s ***,a closed form of the indices is derived in order to reduce implementation complexity of proposed scheduling policy and numerical examples are provided to illustrate the proposed developed results.

关键词： DoS attacks Kalman filter remote state estimation Whittle’s index.

Quantum dots get a bright upgrade

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Light(Science & Applications) 2024年第11期13卷 2438-2440页

作者： Fei ding Institut für Festkörperphysik Leibniz Universität HannoverAppelstraße 230167 HannoverGermany

Developing a bright,deterministic source of entangled photon pairs has been an outstanding scientific and technological *** quantum dots are a promising candidate for this task.A new device combining a circular Bragg resonator and a piezoelectric actuator achieves high brightness and entanglement fidelity simultaneously,overcoming previous *** breakthrough enhances quantum dot applications in entanglement-based quantum communication protocols.

关键词： quantum breakthrough piezoelectric

The Inverse Mean Curvature Flow in Rotationally Symmetric Spaces

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Chinese Annals of Mathematics,Series B 2011年第1期32卷 27-44页

作者： Qi ding School of Mathematical Sciences Fudan University Shanghai 200433 China

In this paper,the motion of inverse mean curvature flow which starts from a closed star-sharped hypersurface in special rotationally symmetric spaces is *** is proved that the flow converges to a unique geodesic spher... 详细信息

关键词： Asymptotic behavior Inverse mean curvature flow Hyperbolic space

Deep structure of the Southeast Asian curved subduction system and its dynamic process

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Journal of Oceanology and Limnology 2024年第3期42卷 701-704页

作者： Weiwei ding Key Laboratory of Submarine Geoscience&Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China

The deep structure,material circulation,and dynamic processes in the Southeast Asia have long been an elusive scientific puzzle due to the lack of systematic scientific observations and recognized theoretical *** on the deep seismic tomography using long-period natural earthquake data,in this study,the deep structure and material circulation of the curved subduction system in Southeast Asia was studied,and the dynamic processes since 100 million years ago was *** is pointed out that challenges still exist in the precise reconstruction of deep mantle structures of the study area,the influence of multi-stage subduction on deep material exchange and shallow magma activity,as well as the spatiotemporal evolution and coupling mechanism of multi-plate *** work should focus on high-resolution land-sea joint 3-D seismic tomography imaging of the curved subduction system in the Southeast Asia,combined with geochemical analysis and geodynamic modelling works.

关键词： curved subduction system deep structure material recycling dynamic process Southeast Asia

Secure communication in wireless powered communication networks with energy accumulation

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Science China(Information Sciences) 2021年第10期64卷 263-265页

作者： ding XU Wireless Communication Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications

Dear editor,Wireless powered communication network(WPCN) is a wireless network where user devices are powered wirelessly by harvesting radio frequency(RF) signals transmitted by dedicated power stations or nearby power sources [1].WPCN is attractive for wireless networks with low-power user devices, such as wireless sensor networks [2] and backscatter networks [3]. Meanwhile,

关键词： Wireless powered communication network secure communication eavesdropping energy accumulation energy harvesting

Signature of high-order azimuthal MHD body modes in sunspot's low atmosphere

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Research in Astronomy and Astrophysics 2015年第9期15卷 1449-1454页

作者： ding Yuan Centre for mathematical Plasma Astrophysics Department of Mathematics

The five-minute oscillations inside sunspots appear to be the absorption of the solar p-mode. It is a potential tool to probe a sunspot＇s sub-structure. We studied the collective properties of five-minute oscillations in the power and phase distribution at the sunspot＇s umbra-penumbra boundary. The azimuthal distributions of the power and phase of five-minute oscillations enclosing a sunspot＇s umbra were obtained with images taken with the Solar Dynamics Observatory/Atmospheric Imaging Assembly （SDO/AIA）. The azimuthal modes were quantified with periodogram analysis and justified with significance tests. The azimuthal nodal structures in an approximately ax- ially symmetric sunspot AR 11131 （2010 Dec 08） were investigated. Mode numbers ra = 2, 3, 4, 7, 10 were obtained in both 1700 A and 1600A bandpasses. The 1600A channel also revealed an extra mode at m = 9. In the upper atmosphere （304 A）, fewer modes were detected at m = 3, 4, 7. The azimuthal modes in the sunspot＇s low atmo- sphere could be interpreted as high-order azimuthal MHD body modes. They were detected in the power and phase of the five-minute oscillations in sunspot AR 11131 with SDO/AIA data. Fewer modes were detected in the sunspot＇s upper atmosphere.

关键词： Sun atmosphere - Sun UV radiation -- Sun sunspots