检索结果-南通市图书馆

Level structure of 116Sb

在线全文

学校读者我要写书评

暂无评论

Level structure of 116Sb

On the global smooth solutions of 3d incompressible Hall-MHd equations

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： d.p.sun,~(1 1)) S.Y.Wang,~(1) B.Qi,~(1) L.W.duan,~(1) G.Wang,~(1) X.L.Ren,~(1) B.T.duan,~(1) X.X.Zhu,~(1) F.Z.Lv,~(1) C.Liu,~(1) C.J.Xu,~(1) H.Hua,~2 S.Q.Zhang,~2 Z.Y.Li,~2 J.M.Yao,~2 L.H.Zhu~3 X.G.Wu,~3 G.S.Li,~3 Y.Liu,~3 X.Q.Li,~3 Y.Zheng,~3 L.L.Wang,~3 L.Wang,~3 1(School of Space Science and physics,Shandong University at Weihai,Weihai 264209,China) 2(School of physics,and State-Key Lab.Nucl.phys.& Tech.,peking University,Beijing 100871,China) 3(China Institute of Atomic Energy,Beijing 102413,China)

The odd-odd nucleus Sb was populated using the reaction Cd（Li,5n） at a beam energy of 48 *** previously known rotational bands have been observed up to high spins.A new△I = 1 band were identified,and were suggested as a magnetic rotational *** rotor model calculations show reasonably good agreement with the *** the spherical discrete levels were also *** 30 newγ—rays were added in the level scheme of Sb.

关键词： odd-odd nucleus magnetic rotational band level scheme

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 319-327页

作者： YUE Gao-cheng sun Wen-da School of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 211106China

The present paper is devoted to the well-posedness issue for the 3d incompressible Hall-MHd system obtained from kinetic models. Our analysis strongly relies on the use of the Fourier analysis. We establish the global existence of smooth solutions for a class of large initial data, this result implies the initial velocity and magnetic field can be arbitrarily large.

关键词： 3d Hall-MHd well-posedness Fourier analysis

Enhanced bifunctional oxygen electrochemical catalytic performance using La-doped CoFe_(2)O_(4)spinel supported by 3d-G for Zn-air batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第7期94卷 778-788页

作者： Yinggang sun Tingwei Zhang peng sun Jigang Wang Wenjie duan Yanqiong Zhuang Likai Wang Zhongfang Li School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

The preparation of bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution(OER)is crucial for Zn-air ***,we report a La doped CoFe_(2)O_(4) spinel catalyst supported on threedimensional graphene(3d-G),where La can facilitate electron transfer from Co to Fe,leading to increased electron cloud density in Fe and improved catalytic *** redshift of the G peak in the Raman spectra indicates the interaction between theπbond of 3d-G and d orbitals in La_(0.2)CoFe_(1.8)O_(4).La_(0.2)CoFe_(1.8)/3d-G exhibits superior ORR performance(E_(1/2)=0.86 V ***)and OER performance(E_(j=10)=1.55 V ***)to CoFe_(2)O_(4)/3d-G(E_(1/2)=0.831 V ***,E_(j=10)=1.603 V ***).Furthermore,it demonstrates excellent bifunctional oxygen catalytic performance while maintaining high power density and stability in liquid zinc-air batteries(ZABs)and flexible ZABs(F-ZABs).This work presents a viable strategy for utilizing rare earth element doped spinels to enhance oxygen catalyst and ZABs performance.

关键词： Zn-air batteries Electrocatalysts La_(0.2)CoFe_(1.8)/3d-G Electron pump Bifunctional oxygen catalytic performance

Transfer film effects induced by 3d-printed polyether-ether-ketone with excellent tribological properties for joint prosthesis

在线全文

学校读者我要写书评

暂无评论

Bio-design and Manufacturing 2024年第1期7卷 43-56页

作者： Yang Li Jibao Zheng Changning sun dichen Li State Key Laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710054China National Medical products Administration(NMpA)Key Laboratory for Research and Evaluation of Additive Manufacturing Medical devices Xi’an Jiaotong UniversityXi’an 710054China

Based on the building principle of additive manufacturing,printing orientation mainly determines the tribological properties of joint *** this study,we created a polyether-ether-ketone(pEEK)joint prosthesis using fused filament fabrication and investigated the effects of printing orientation on its tribological properties using a pin-on-plate tribometer in 25% newborn calf *** ultrahigh molecular weight polyethylene transfer film is formed on the surface of pEEK due to the mechanical capture of wear debris by the 3d-printed groove morphology,which is significantly impacted by the printing orientation of *** the printing orientation was parallel to the sliding direction of friction,the number and size of the transfer film increased due to higher steady *** transfer film protected the matrix and reduced the friction coefficient and wear rate of friction pairs by 39.13%and 74.33%,***,our findings provide a novel perspective regarding the role of printing orientation in designing knee prostheses,facilitating its practical applications.

关键词： 3d printing orientation Transfer film Tribological properties polyether-ether-ketone Knee prosthesis

Control of 2-d Semi-Markov Jump Systems:A View from Mode Generation Mechanism

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 258-260页

作者： Yunzhe Men Jian sun Jie Chen the National Key Laboratory of Autonomous Intelligent Unmanned Systems the School of AutomationBeijing Institute of TechnologyBeijing 100081 the Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China the department of Control Science and Engineering Tongji UniversityShanghai 201804 the National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

dear Editor,Two-dimensional(2-d) systems have wide applications in image data processing,gas absorption and fluid dynamics analysis [1]-[3].When there exist abrupt changes in 2-d systems,they are usually modeled by 2-d Markov jump systems(MJSs) or 2-d semi-Markov jump systems(SMJSs).This letter investigates the control of 2-d SMJSs based on a novel mode generation mechanism,which could avoid mode ambiguousness phenomenon caused by the evolution of system mode in two different *** criterion that guarantees the almost surely exponential stability of the system is obtained.A thermal process is studied to demonstrate the availability of the proposed method.

关键词： Markov mode system

Numerical analysis of high‑speed railway slab tracks using calibrated and validated 3d time‑domain modelling

在线全文

学校读者我要写书评

暂无评论

Railway Engineering Science 2024年第1期32卷 36-58页

作者： A.F.Esen O.Laghrouche p.K.Woodward d.Medina‑pineda Q.Corbisez J.Y.Shih d.p.Connolly Institute for High‑Speed Rail and System Integration University of LeedsLeeds LS29JTUK Institute for Infrastructure and Environment Heriot-Watt UniversityEdinburgh EH144ASUK Alstom Transport Saint‑OuenFrance Birmingham Centre for Railway Research and Education University of BirminghamBirmingham B152TTUK

Concrete slabs are widely used in modern railways to increase the inherent resilient quality of the tracks,provide safe and smooth rides,and reduce the maintenance *** this paper,the elastic performance of a novel slab trackform for high-speed railways is investigated using three-dimensional finite element modelling in *** is then compared to the performance of a ballasted ***,slab and ballasted track models are developed to replicate the full-scale testing of track *** the models are calibrated with the experimental results,the novel slab model is developed and compared against the calibrated slab track *** slab and ballasted track models are then extended to create linear dynamic models,considering the track geodynamics,and simulating train passages at various speeds,for which the Ledsgard documented case was used to validate the *** travelling at low and high speeds are analysed to investigate the track deflections and the wave propagation in the soil,considering the issues associated with critical *** train loading methods are discussed,and the most practical approach is retained and ***,correlations are made between the geotechnical parameters of modern high-speed rail and conventional *** is found that considering the same ground condition,the slab track deflections are considerably smaller than those of the ballasted track at high speeds,while they show similar behaviour at low speeds.

关键词： High-speed railways Slab track New ballastless track Ballasted track Critical speeds Finite element modelling Calibration of numerical models

Control of electromechanical performance in 3d printing latticestructured BaTiO_(3) piezoelectric ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第7期13卷 987-1001页

作者： Zhujun Jiang Yinghong sun Jimin Chen Yong Zeng Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Engineering Research Center of 3d printing for digital Medical Health Beijing University of TechnologyBeijing 100124China

Barium titanate(BaTiO_(3))piezoelectric ceramics with triply periodic minimal surface(TpMS)structures have been frequently used in filters,engines,artificial bones,and other fields due to their high specific surface area,high thermal stability,and good heat ***,only a limited number of studies have analyzed the effect of various parameters,such as different wall thicknesses and porosities of TpMS structures,on ceramic electromechanical *** this study,we first employed vat photopolymerization(Vpp)three-dimensional(3d)printing technology to fabricate high-performance BaTiO_(3) *** investigated the slurry composition design and forming process and designed a stepwise sintering postprocessing technique to achieve a density of 96.3%and a compressive strength of 250±25 Mpa,with the piezoelectric coefficient(d_(33))reaching 263 pC/***,we explored the influence of three TpMS structures,namely,diamond,gyroid,and Schwarz p,on the piezoelectric and mechanical properties of BaTiO_(3) ceramics,with the gyroid structure identified as exhibiting optimal ***,we examined the piezoelectric and mechanical properties of BaTiO_(3) ceramics with the gyroid structure of varying wall thicknesses and porosities,thus enabling the modulation of ceramic electromechanical performance.

关键词： three-dimensional(3d)printing piezoelectric ceramics porous structure mechanical properties electrical properties

Structural and Chemical Characterization of the Ediacaran Embryo-Like Fossils via the Combination of 3d-XRM and FIB-SEM Approaches

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

Journal of Earth Science 2024年第4期35卷 1204-1214页

作者： Qian Chen Weichen sun Suping Wu Zongjun Yin State Key Laboratory of palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing210008China University of Chinese Academy of Sciences Nanjing211135China

The three-dimensional(3d)morphology,anatomy,and in-situ chemical composition analysis of fossils are crucial for systematic paleontology and determining their phylogenetic *** electron microscopy(SEM)coupled with energy-dispersive X-ray spectroscopy(EdS),offers valuable structural and chemical information for the analysis of ***,its primary limitation is the restriction to two-dimensional surface data,which limits the exploration of fossils’3d ***,3d X-ray microscopy(3d-XRM),also known as a novel form of micro-computed tomography(micro-CT)facilitates the non-destructive 3d reconstruction of fossil ***,it lacks the capability to provide in-situ compositional *** the constraints inherent in these individual techniques,and in response to the evolving requirements of paleontological research,this study introduces an integrated approach that combines 3d-XRM with EdS-coupled focused ion beam scanning electron microscopy(FIB-SEM).This innovative strategy is designed to synergize the advantages of both techniques,thereby addressing challenges that conventional methods *** enables the rapid identification of regions of interest(ROI)within fossil specimens at micrometer ***,this method collects detailed data on both 3d structures and chemical compositions at the nanometer scale for the identified *** integrated approach represents a significant advancement in paleontological and geological research methodologies,promising to meet the increasing demands of these fields.

关键词： Embryo-like microfossils structural and chemical characterization 3d-XRM FIB-SEM 3d reconstruction

A semi-analytical multi-harmonic balance method on full-3d contact model for dynamic analysis of dry friction systems

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第2期37卷 309-329页

作者： He sun dayi ZHANG Yaguang WU Qingyang SHEN dianyin HU Research Institute of Aero-Engine Beihang UniversityBeijing 100191China School of Energy and power Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191China Sino-French Engineering School Beihang UniversityBeijing 100191China AECC Sichuan Gas Turbine Research Establishment Chengdu 610500China

dry friction damping structures are widely-used in aero-engines to mitigate *** nonlinear nature of friction and the two-dimensional in-plane motion on the contact interface bring challenges to accurately and efficiently predict the forced response of frictionally damped *** state-of-the-art Multi-Harmonic Balance Method(MHBM)on quasi-3d contact model in engineering cannot precisely capture the kinematics on the friction interface although the efficiency is *** full-3d contact model can describe the constitutive relationship of the interface in a more accurate manner;however,the efficiency and convergence are not guaranteed for large-scale *** this paper,a semi-analytical MHBM on full-3d contact model is *** original Trajectory Tracking Method(TTM)for evaluating the contact force is reformulated to make the calculation more concise and the derivation of the Analytical Jacobian Matrix(AJM)*** on the chain rule of derivation,the AJM which is the core to upgrade the performance is *** a shrouded blade finite element model,the accuracy and efficiency of the proposed method are compared with both the MHBM on full-3d contact model with numerical Jacobian matrix and the MHBM on quasi-3d contact model with *** results show that the AJM improves significantly the efficiency of the MHBM on full-3d contact *** time cost of the proposed method is in the same order of magnitude as that of the MHBM on quasi-3d contact *** also confirm that the full-3d contact model is necessary for the dynamic analyses of shrouded *** one uses the quasi-3d model,the estimation relative error of damping can even reach 31.8%in some *** addition,the AJM also brings benefits for stability *** is highly recommended that engineers use the MHBM on full-3d contact model for the dynamic analysis and design of shrouded blades.

关键词： dry friction damping Multi-harmonic balance method Trajectory tracking method Jacobian matrix Shrouded blade