检索结果-南通市图书馆

Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： Xia-hui pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

Description of a new species of the genus Rhynchina Guenée, 1854(Lepidoptera, Erebidae, Hypeninae) from Southeastern Tibet,China

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 Forestry Research 2015年第3期26卷 735-738页

作者： Zhao-hui pan hui-Lin Han Institute of Plateau Ecology Agriculture and Animal Husbandry College of Tibet University School of Forestry Northeast Forestry University

A new species of the genus Rhynchina Guenee, 1854, R. tongmaia pan and Han, sp. n. is described from China. This species is compared with a superciaUy similar congener, R. rivuligera Butler, 1889 with illustrations of... 详细信息

关键词： Erebidae Hypeninae Rhynchina Newspecies China

Quantum heat engine cycle working with a strongly correlated electron system

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 792-797页

作者： WANG HaiLong pan hui WANG RongMing Department of Physics and State Key Laboratory of Software Development Environment Beijing University of Aeronautics and AstronauticsBeijing 100191China Key Laboratory of Micro-nano Measurement-Manipulation and Physics(Ministry of Education)and Department of Physics Beijing University of Aeronautics and AstronauticsBeijing 100191China

A new model of a quantum heat engine （QHE） cycle is established, in which the working substance consists of an interacting electrons system. One of our purposes is to test the validity of the second law of thermodynamics by this model, which is more general than the spin-1/2 antiferromagnetic Heisenberg model since it would recover the spin model when the on-site Coulomb interaction U is strong enough. On the basis of quantum mechanics and the first law of thermodynamics, we show no violation of the second law of thermodynamics during the cycle. We further study the performance characteristics of the cycle by investigating in detail the optimal relations of efficiency and dimensionless power output. We find that the efficiency of our engine can be expressed as η = t22/t21 in the large-U limit, which is valid even for a four sites QHE.

关键词： quantum heat engine strongly correlated electrons Hubbard model

A theoretical model for impact protection of flexible polymer material

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2024年第3期14卷 217-226页

作者： huifeng Xi hui pan Song Chen Heng Xiao MOE Key Lab of Disaster Forecast and Control in Engineering School of Machanics and Construction EngineeringJinan UniversityGuangzhou 510632China Doctor Workstation of Xuwen County Guangdong Hydropower Energy Co. Ltd.Xuwen 524100China

The relationship between the protective performance of flexible polymer material and material parameters(elasticmodulus,viscosity coefficient)is explored,an impact collision motion equation between two bodies is establishedfrom the viscoelastic material constitutive,and the relationship between the kinematic response and the materialparameters is *** on the Kelvin constitutive model,a theoretical model for impact between the pro-tective body and the protected body is established,then the dynamic response is *** feasibility of themodel was verified by drop hammer experiment,and the material parameters(elastic modulus,viscosity coeffi-cient)were obtained by *** model is discretized and the relationship between local impact response andmaterial parameters is *** discussion results on the relationship between the impact response and theprotective material performance indicate that adjusting the elastic modulus,viscosity coefficient,and thicknessof the protective material can effectively improve protective effect.

关键词： Flexible polymer material Viscoelastic material Kelvin modelDynamic response Elastic modulus and viscosity coefficient

Weakly supervised action anticipation without object annotations

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第2期17卷 101-110页

作者： Yi ZHONG Jia-hui pan Haoxin LI Wei-Shi ZHENG School of Computer Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China Key Laboratory of Machine Intelligence and Advanced Computing Ministry of EducationGuangzhou 510006China

Anticipating future actions without observing any partial videos of future actions plays an important role in action prediction and is also a challenging *** obtain abundant information for action anticipation,some methods integrate multimodal contexts,including scene object ***,extensively labelling each frame in video datasets requires considerable *** this paper,we develop a weakly supervised method that integrates global motion and local finegrained features from current action videos to predict next action label without the need for specific scene context ***,we extract diverse types of local features with weakly supervised learning,including object appearance and human pose representations without ground ***,we construct a graph convolutional network for exploiting the inherent relationships of humans and objects under present *** evaluate the proposed model on two datasets,the MPII-Cooking dataset and the EPIC-Kitchens dataset,and we demonstrate the generalizability and effectiveness of our approach for action anticipation.

关键词： action anticipation weakly supervised learning relation modelling graph convolutional network

Synthesis and study of MPNS/SMA nano-composite tanning agent

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第4期19卷 435-437页

作者： hui pan Mei Qi Zhi Jun Zhang Laboratory of Special Functional Material Henan UniversityKaifeng 475004PR China

The radical polymerization of maleic anhydride（MA）,styrene（ST）with the vinyl groups introduced onto the surface of the nano-sized silica via solution polymerization method was *** methacryloxypropyl nano-sized silica（MPNS）was used as macromonomer and polymerized with maleic anhydride and styrene by initiating with BPO in *** structure and properties of MPNS/SMA nano-composite were characterized by FT-IR spectra and ***,it was applied as tanning agent compared with the traditional styrene-maleic anhydride copolymer in *** was found that the applied leather had better quality characteristics with the addition of the nano-sized silica.

关键词： Nano-composite Tanning agent Polymerization Leather

Cobalt-embedded 3D conductive honeycomb architecture to enable high-sulphur-loading Li-S batteries under lean electrolyte conditions

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第9期15卷 8091-8100页

作者： hui pan Zhibin Cheng Jan Fransaer Jiangshui Luo Michael Wübbenhorst Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU LeuvenLeuven 3001Belgium Fujian Key Laboratory of Polymer Materials College of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China Department of Materials Engineering KU LeuvenLeuven 3001Belgium Lab of Electrolytes and Phase Change Materials College of Materials Science and EngineeringSichuan UniversityChengdu 610065China

High sulphur loading and lean electrolyte conditions are important to achieve the high theoretical energy density of lithiumsulphur(Li-S)***,serious problems such as low sulphur utilization and fast capacity fade are typically experienced under low electrolyte/sulphur(E/S)ratios and high sulphur loading *** address these issues,a cobaltcontaining three-dimensional conductive honeycomb(Co@N-HPC)is proposed in this work as a material for sulphur *** good electrical conductivity and high density of catalytic sites of(Co@N-HPC)allow fast redox kinetics of lithium polysulfide(LiPS)in high-sulphur-loading *** addition,the hierarchical structure and good wettability by the electrolyte of Co@NHPC facilitates electrolyte penetration and LiPS conversion,leading to a high utilization of sulphur under lean electrolyte ***,at a current density of 0.2 C,a volumetric capacity of 1,410 mAh·cm^(−3)was attained with a sulphur loading of 5.1 mg·cm^(−2)and an E/S ratio of 5μL·mg^(−1).This work provides ideas for the development of lean electrolyte Li-S batteries with a high sulphur loading.

关键词： honeycomb architecture cobalt nanoparticles high sulphur loading lean electrolyte lithium-sulphur battery

Control of topological phase transitions in Dirac semimetal films by exchange fields

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第1期26卷 386-390页

作者： Fei Yang Hai-Long Wang hui pan Department of Physics Beihang University Belting 100191 China

The exchange field effects on topological Dirac semimetal（DSM） films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall（QAH） state from the topologically trivial state（Z2 = 0） or from the topologically nontrivial state（Z2 = 1）, depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.

关键词： exchange field Dirac semimetal quantum anomalous Hall state quantum spin Hall state

One-step nanoarchitectonics of a multiple functional hydrogel based on cellulose nanocrystals for effective tumor therapy

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第9期15卷 8636-8647页

作者： Tianxing Chen Tengteng Yao hui pan hui Peng AndrewKWhittaker Yao Li Shenmin Zhu Zhaoyang Wang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Ophthalmology Shanghai Tenth People’s HospitalTongji UniversityShanghai 200092China Department of Ophthalmology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Australian Institute for Bioengineering and Nanotechnology and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology The University of QueenslandBrisbaneQLD 4072Australia

Hypoxia is a huge barrier for the development of photodynamic therapy(PDT).Chemodynamic therapy(CDT)could provide a possible solution to this *** this work,a controlled Schiff-base reaction was conducted between amido groups on the surface of carbon dots(CDs)and aldehyde groups on aldehyde-modified cellulose nanocrystals(mCNCs)as well as aldehydemCNCs decorated with Fe_(3)O_(4)*** this process,the mCNCs not only prevent the agglomeration of Fe_(3)O_(4)but also form hydrogels with *** CDs act as both photothermal agent and *** hypoxia could be effectively relieved through the Fenton reaction due to the addition of Fe_(3)O_(4),and the·OH produced in the reaction further induces CDT and enhances tumor therapy *** therapy performance was further verified through in vitro cell experiments and in vivo animal *** convenient method provides inspirations for the design and preparation of advanced biomaterials with multiple functions for cancer therapy.

关键词： injectable hydrogel tumor therapy carbon dots cellulose nanocrystals magnetic nanoparticles

Spin-Polarized Currents in Double Quantum Dots with Rashba Spin-Orbit Interactions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第8期30卷 132-135页

作者： LI Zhen-Shan pan hui LÜRong Department of Physics and State Key Laboratory of Software Development Environment Beihang UniversityBeijing 100191 Department of Physics Tsinghua UniversityBeijing 100084

We propose a new scheme of realizing spin-polarized currents in a double quantum dot *** the presence of Rashba spin-orbit coupling interactions and different Zeeman splittings of each quantum dot,the currents are *** polarization can be controlled by tuning the strength of Rashba spin-orbit coupling and external magnetic fields,which can produce nearly 100%spin-polarized ***,we explain and analyze the mechanism of the strongly spin-polarized *** we give two phase diagrams to display our results.

关键词： polarized quantum Rashba