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Excellent energy storage performance in Bi_(0.5)Na_(0.5)TiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site modification

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Journal of Advanced Ceramics 2024年第3期13卷 345-353页

作者： Kaihua Yang Gengguang Luo Li Ma Ruoxuan che Zhiyi che Qin feng Zhenyong Cen Xiyong chen Jiajun Zhou Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Optical and Electronic Information Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage ***_(0.5)Na_(0.5)TiO_(3)-based lead-free materials exhibit high polarization,but the high remanent polarization and large polarization hysteresis limit their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)Sr_(0.2)Ca_(0.2))(Ti1-x%Zrx%)O_(3)are designed by adding multiple ions in the A-site and replacing the B-site Ti^(4+)with a certain amount of Zr^(4+).The newly designed system showed high relaxor feature and slim polarization-electric(P-E)***,improved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular importance is that both high recoverable energy storage density of 6.6 J/cm^(3) and energy efficiency of 93.5%were achieved under 550 kV/cm for the ceramics of x=6,accompanying with excellent frequency stability,appreciable thermal stability,and prosperous discharge *** work not only provides potential dielectric materials for energy storage applications,but also offers an effective strategy to obtain dielectric ceramics with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))TiO_(3) high-entropy perovskite ceramics polarization saturation relaxor ferroelectrics(RFEs)

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Deciphering nucleic acid modifications by chemical derivatization-mass spectrometry analysis

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Chinese chemical Letters 2019年第1期30卷 1-6页

作者： Meng-Dan Lan Bi-feng yuan Yu-Qi feng Key Laboratory of Analytical chemistry for Biology and Medicine (Ministry of Education) Department of Chemistry Wuhan University

Now increasing chemical modifications are discovered on genomic DNA and RNA. Up to date, more than150 chemical modifications are identified in nucleic acids. These chemical modifications do not change the sequence of DNA and RNA, but alter their structures and biochemical properties, and eventually control or regulate the spatial and temporal expression of genes. Elucidation of the functional roles of these modifications is vital to our understanding of living organisms. However, the modifications in DNA and RNA generally have extremely low abundance in vivo. Therefore, sensitive and specific detection methods are essential to decipher the functional roles of these modifications. chemical derivatization in combination with mass spectrometry(MS) analysis has been proved to be a promising strategy to efficiently analyze these modifications in DNA and RNA. In the last several years, many chemical derivatization-MS-based analytical methods were established for the sensitive and effective analysis of nucleic acid modifications. In this review, we summarize the recent advances for deciphering modifications in DNA and RNA by chemical derivatization-MS analysis. We hope this review can stimulate the future studies of DNA and RNA modifications.

关键词： Mass spectrometry analysis chemical derivatization DNA modification RNA modification

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Simulation of construction shape-forming process of cable domes

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Science China(Technological Sciences) 2012年第1期55卷 101-116页

作者： YE JiHong feng RuoQiang KAN yuan Key Laboratory of Concrete and Pre-Stressed Concrete Structure of Ministry of Education Southeast University Nanjing 210096 China

A cable dome has no stiffness or load carrying capacity unless it has been *** of cable domes are based on successful prestressing designs,making force finding analysis very important.A new force finding method named the imbal-ance force iterative method is proposed,which can overcome some limitations of the integrity feasible prestressing *** instance,even if groups are assigned by mistake,the pretension distribution that satisfies the known geometry form can also be *** method possess good stability and calculation efficiency,and a case study indicates that it is applicable to the force finding of large and complicated cable *** the other hand,form finding analysis of cable domes is also a key engineering ***,rigid displacement occurs in this process,which makes the analysis more *** this pa-per,the dynamic relaxation method was selected,and the problem of rigid displacement was therefore effectively *** method includes two steps:first,the stretching cables are released,and secondly,an axial force is imposed on the two ends of each released *** method is convenient in its calculation and clear in its conception.A case study indicates that the method is suitable for the simulation of the construction process of various cable domes and cable-strut tension ***,a form finding experiment was conducted on a model of a cable dome with a diameter of 4.8 m by tensing diagonal *** behavior of the model in the form finding process was *** experimental results indicate that the ini-tial lengths of members and prestress loss are key issues in cable domes *** results also prove that the methods of form finding and force finding proposed in this paper are reliable and effective.

关键词： cable domes force control of construction process form control of construction process imbalance force iterativemethod dynamic relaxation method construction shape-forming process experiment

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Progress of studies in China from July 2010 to May 2015 on the influence of the Kuroshio on neighboring Chinese seas and the Ryukyu Current

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Acta Oceanologica Sinica 2015年第12期34卷 1-10页

作者： yuan Yaochu ZHU Xiaohua ZHOU feng State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography State Oceanic Administration

The influence of the Kuroshio on neighboring Chinese seas and the Ryukyu Current is a very important subject of interest in physical oceanography. To deeply explain the research progress made by Chinese scientists from July2010 to May 2015, the following three aspects are reviewed in this paper. The first concerns the Kuroshio intrusion into the South China Sea（SCS） and its circulation around the Luzon Strait. There are two very important points to be explained： the seasonal and inter-annual variation of the Kuroshio intrusion and the mechanisms of the Kuroshio intrusion and the influence of the Kuroshio on currents in the Luzon Strait and circulation in the northern SCS. The second concerns the variability of the Kuroshio and its interaction with the East China Sea（ECS）. There are following four interesting topics to be explained： an overview of studies on the Kuroshio in the ECS; the Kuroshio intrusion into the ECS, water exchange, and dynamic impacts; the downstream increase of nutrient transport by the Kuroshio; and the application of satellite remote sensing on terrestrial material transport by the Kuroshio intrusion into the ECS. Third, the interaction between the Ryukyu Current and Kuroshio in the ECS are also discussed. Finally, the main results are summarized and areas of further study are simply discussed.

关键词： Kuroshio intrusion circulation South China Sea East China Sea currents in Luzon Strait Ryukyu Current

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Intelligent wheelchair system based on s EMG and head gesture

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The Journal of China Universities of Posts and Telecommunications 2015年第2期22卷 74-80,95页

作者： Zhang Yi feng Xiaolin Luo yuan National Engineering Research and Development Center for Information Accessibility Chongqing University of Posts and Telecommunications

Because the single channel surface electromyographic （sEMG） signals easily caused a complex operation during the real-time operation, an intelligent wheelchair system based on sEMG and head gesture was proposed in this paper. A distributed parallelly decision fusion algorithm fused classification results of the two signals to form a final judgment. After sEMG was decomposed by wavelet packet, feature information of some subspace was weaken, because subspace dimension was very large. To solve the problem, the paper proposed an improved wavelet packet decomposition algorithm, which extracted sample entropy from four subspaces of improved wavelet packet decomposition and took it as the feature information. Experimental results show that the intelligent wheelchair system based on sEMG and head gesture has not only a simple operation and shorter operating time, but also a better stability and security.

关键词： sEMG head gesture, decision fusion, improved wavelet packet, intelligent wheelchair

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Real-time accurate Free-Form Deformation in terms of triangular Bézier surfaces

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Applied Mathematics(A Journal of Chinese Universities) 2014年第4期29卷 455-467页

作者： CUI yuan-min feng Jie-qing State Key Lab of CAD&CG Zhejiang University

We implemented accurate FFD in terms of triangular Bezier surfaces as matrix multiplications in CUDA and rendered them via OpenGL. Experimental results show that the proposed algorithm is more efficient than the previ... 详细信息

关键词： accurate Free-Form Deformation GPU acceleration CUDA triangular B@zier surface.

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MoM-PO/SBR Algorithm Based on Collaborative Platform and Mixed Model

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第4期36卷 589-598页

作者： TANG Xiaobin feng yuan GONG Xiaoyan China Academy of Electronics and Information Technology Beijing 100041P.R.China Department of Radar Technology Academy of Air Force Early WarningWuhan 430019P.R.China Department of Command Rocket Army Command AcademyWuhan 430012P.R.China

For electromagnetic scattering of 3?D complex electrically large conducting targets,a new hybrid algorithm,MoM?PO/SBR algorithm,is presented to realize the interaction of information between method of moment(MoM)and physical optics(PO)/shooting and bouncing ray(SBR).In the algorithm,the COC file that based on the Huygens equivalent principle is introduced,and the conversion interface between the equivalent surface and the target is *** then,the multi?task flow model presented in this paper is adopted to conduct CPU/graphics processing unit(GPU)tests of the algorithm under three modes,i.e.,MPI/OpenMP,MPI/compute unified device architecture(CUDA)and multi?task programming model(MTPM).Numerical results are presented and compared with reference solutions in order to illustrate the accuracy and the efficiency of the proposed algorithm.

关键词： graphics processing unit(GPU) multi⁃task programming model(MTPM) physical optics(PO) method of moment(MoM)

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EXPERIMENTAL INVESTIGATION FOR THE EFFECT OF ROTATION ON THREE-DIMENSIONAL FLOW FIELD IN FILM-COOLED TURBINE

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 10-15页

作者： yuan feng ZHU Xiaocheng DU Zhaohui School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China

An experimental investigation of three-dimensional flow field in a film-cooled turbine model is carried out by using particle image velocimeter （PIV） in a low-speed wind tunnel. The effects of different blowing ratios （M=1.5, 2） on the flow field are studied. The experimental results reveal the classical phenomena of the formation of kidney vortex pair and secondary flow in wake region behind the jet hole. And the changes of the kidney vortex pair and the wake at different locations away from the hole on the suction and pressure sides are also studied. Compared with the flow field in stationary cascade, there are centrifugal force and Coriolis force existing in the flow field of rotating turbine, and these forces bring the radial velocity in the jet flow. The effect of rotatien on the flow field of the pressure side is more distinct than that on the suction side from the measured flow fields in Y-Z plane and radial velocity contours. The increase of blowing ratio makes the kidney vortex pair and the secondary flow in the wake region stronger and makes the range of the wake region enlarged.

关键词： Film-cooled turbine rotor PIV measurement Blowing ratio Three-dimensional flow field

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Regularity Criteria of Axisymmetric Weak Solutions to the 3D Magnetohydrodynamic Equations

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 289-302页

作者： Bao-quan yuan feng-ping LI School of Mathematics and Information Science Henan Polytechnic University

In this paper, we study the regularity criteria for axisymmetric weak solutions to the MHD equa- tions in R3. Let we, Jo and ue be the azimuthal component of w, J and u in the cylindrical coordinates, respectively. Then the axisymmetric weak solution （u,b） is regular on （0, T） if （wo,Jo） E Lq（O,T;Lp） or （oae,V（uoeo）） e Lq（0,T;Lp） with 3 ＋ 2 〈 2, 3 〈 p 〈 oo. In the endpoint case, one needs conditions （we, Jo） C LI（0, T;B∞∞） or （wo, V（uoeo）） C LI（0, T;B ∞∞）.

关键词： regularity criteria axisymmetric solutions Besov space

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New Nb-Ta Mineralization Age of the Dajishan W-Nb-Ta Deposit in Jiangxi Province,South China

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Acta Geologica Sinica(English Edition) 2019年第2期93卷 485-486页

作者： LIU feng che Xudong HU Huan ZHANG Wenlan LU Jianjun State Key Laboratory fo r Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University

Objective The Dajishan W-Ta-Nb deposit is located in the junction of southern Jiangxi and Guangdong Provinces(Fig. 1a). This deposit contains about 190, 000 tons of WO3 reserves,belonging to a super-large W deposit. Most W mineralization (mainly wolframite) at Dajishan occurred in quartz veins, with also some disseminated wolframite in the No. 69 granite.

关键词： MS Pb Jiangxi Province South China

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