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A smoothed assumed enhanced strain method for frictional contact with constant strain elements

Journal of Rock Mechanics and Geotechnical engineering 2024年第11期16卷 4369-4385页

作者： Fushen Liu Wei Sun Minghui Li Xiaonan Shang Computing center for Geotechnical engineering Zhejiang UniversityHangzhou310058China research center of Coastal and Urban Geotechnical engineering Zhejiang UniversityHangzhou310058China engineering research center of Urban Underground Development of zhejiang province Hangzhou310058China School of Civil engineering Sun Yat-sen UniversityGuangzhou510275China School of Energy Resource China University of Geosciences(Beijing)Beijing100083China

This paper presents a finite element framework for imposing frictional contact conditions on embedded fracture faces,implemented by the constant-strain assumed enhanced strain(AES)method,where penalty method is used to impose both non-penetration constraint and Coulomb’s law of *** proposed constant-strain AES method for modeling embedded frictional contact can be cast into an integration algorithm similar to those used in the classical plasticity theory,where displacement jump is calculated from the local traction equilibrium at Gauss point,so the method does not introduce any additional global degrees of ***,constant-strain elements are often desirable in practice because they can be easily created automatically for large-scale engineering applications with complicated *** encountered in other enriched finite element methods for frictional contact,the problem of normal contact pressure oscillations is also observed in the constant-strain AES ***,we developed a strain-smoothing procedure to effectively mitigate the *** investigated and verified the proposed AES framework through several numerical examples,and illustrated the capability of this method in solving challenging nonlinear frictional contact problems.

关键词： Assumed enhanced strain(AES)method Frictional contact Strain-smoothing method Penalty method

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Development and prospect of near-infrared spectroscopy-assisted schizophrenia diagnosis based on bibliometrics

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World Journal of Psychiatry 2025年第1期15卷 7-11页

作者： Yan Zhang Hao-Yu Xing Juan Yan Administration Office Lishui Second People’s HospitalLishui 323060Zhejiang ProvinceChina Department of Medical engineering The Affiliated Mental Health Center&Hangzhou Seventh People's HospitalZhejiang University School of MedicineHangzhou 310013Zhejiang ProvinceChina Quality Control Office The Affiliated Mental Health Center&Hangzhou Seventh People's HospitalZhejiang University School of MedicineHangzhou 310013Zhejiang ProvinceChina

In this editorial,we comment on the recent article by Fei et al exploring the field of near-infrared spectroscopy(NIRS)research in schizophrenia from a bibliometrics *** recent years,NIRS has shown unique advantages in the auxiliary diagnosis of schizophrenia,and the introduction of bibliometrics has provided a macro perspective for research in this *** the opportunities brought about by these technological developments,remaining challenges require multidi-sciplinary approach to devise a reliable and accurate diagnosis system for ***,NIRS-assisted technology is expected to contribute to the division of methods for early intervention and treatment of schizophrenia.

关键词： Bibliometrics Schizophrenia Near-infrared spectroscopy Diagnostic technique Data analysis

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Tailoring edge and interface states in topological metastructures exhibiting the acoustic valley Hall effect

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 82-92页

作者： Jiao Wang Yang Huang WeiQiu Chen Key Laboratory of Soft Machines and Smart Devices of zhejiang province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China Soft Matter research center Zhejiang UniversityHangzhou 310027China

In this study, we investigate the acoustic topological insulator or topological metastructure, where an acoustic wave can exist only in an edge or interface state instead of propagating in bulk. Breaking the structural symmetry enables the opening of the Dirac cone in the band structure and the generation of a new band gap, wherein a topological edge or interface state ***, we systematically analyze two types of topological states that stem from the acoustic valley Hall effect mechanism;one type is confined to the boundary, whereas the other type can be observed at the interface between two topologically different structures. Results denote that the selection of different boundaries along with appropriately designed interfaces provides the acoustic waves in the band gap range with abilities of one-way propagation, dual-channel propagation, immunity from backscattering at sharp corners, and/or transition between propagation at interfaces and boundaries. Furthermore, we show that the acoustic wave propagation paths can be tailored in diverse and arbitrary ways by combing the two aforementioned types of topological states.

关键词： acoustic crystals valley Hall effect edge states interface states Dirac cone

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A hierarchical vascularized engineered bone inspired by intramembranous ossification for mandibular regeneration

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International Journal of Oral Science 2022年第3期14卷 309-320页

作者： Xin Ye Jianxiang He Shaolong Wang Qianglong Han Dongqi You Bin Feng Feiya Zhao Jun Yin Mengfei Yu Huiming Wang Huayong Yang Key Laboratory of Oral Biomedical research of zhejiang province Stomatology HospitalSchool of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesHangzhouChina The State Key Laboratory of Fluid Power and Mechatronic Systems Key Laboratory of 3D Printing Process and Equipment of Zhejiang ProvinceSchool of Mechanical EngineeringZhejiang UniversityHangzhouChina

Mandibular defects caused by injuries,tumors,and infections are common and can severely affect mandibular function and the patient's ***,mandible reconstruction with a mandibular bionic structure remains *** by the process of intramembranous ossification in mandibular development,a hierarchical vascularized engineered bone consisting of angiogenesis and osteogenesis modules has been ***,the hierarchical vascular network and bone structure generated by these hierarchical vascularized engineered bone modules match the particular anatomical structure of the *** ultra-tough polyion complex has been used as the basic scaffold for hierarchical vascularized engineered bone for ensuring better reconstruction of mandible *** to the results of in vivo experiments,the bone regenerated using hierarchical vascularized engineered bone is similar to the natural mandibular bone in terms of morphology and *** sonic hedgehog signaling pathway is specifically activated in hierarchical vascularized engineered bone,indicating that the new bone in hierarchical vascularized engineered bone underwent a process of intramembranous ossification identical to that of mandible ***,hierarchical vascularized engineered bone has a high potential for clinical application in mandibular defect ***,the concept based on developmental processes and bionic structures provides an effective strategy for tissue regeneration.

关键词： A hierarchical vascularized engineered bone inspired by intramembranous ossification for mandibular regeneration

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Experimental study on rehydration conditions of freeze-dried platelets

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Journal of zhejiang University-Science A(Applied Physics & engineering) 2009年第5期10卷 697-703页

作者： Ju-li FAN Xian-guo XU Shao-zhi ZHANG Fa-ming ZHU Guang-ming CHEN Li-xing YAN Institute of Refrigeration and Cryogenics Zhejiang Universit Hangzhou 310027 China Key Laboratory of Blood Safety research Ministry of Health Blood Center of Zhejiang Province Hangzhou 310006 China

A rehydration process for freeze-dried human platelets was studied on 1 ml of samples. The effects of prehydration duration, prehydration temperature, an rehydration solution on the recovery rate, mean platelet volume （MPV）, and platelet distribution width （PDW） were investigated. The mass changes during the prehydration process were also studied. Three prehydration durations： 0, 1.5, and 3.5 h, and two rehydration solutions： platelet-poor plasma and phosphate-buffered saline （PBS）, were tested. It was found that：（1） the prehydration was of significance; （2） 1.5 h of prehydration had better effects than 3.5 h of prehydration; （3） as a rehydration solution, the platelet-poor plasma behaved better than the PBS. The impacts of prehydration duration and temperature on the results were studied. There was almost no difference between 35 and 37 ℃. Among all the prehydration durations tested, 15, 30, 60, 90, and 120 min, the best result was achieved with the time duration of 15 min. The weights of prehydrated platelets at the end of each test were measured and the water contents were calculated. After 15 min ofprehydration, the water contents in the samples were about （4.8±0.01）% and （5.27±0.29）% （w/w） corresponding to the conditions of 35 and 37 ℃, respectively. These results will be helpful for further studies on the freeze-drying of mammalian cells.

关键词： Freeze-drying Platelets Rehydration Prehydration Rehydration solution

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Balancing efficiency and transparency in organic transparent photovoltaics

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npj Flexible Electronics 2022年第1期6卷 391-400页

作者： Ruiqian Meng Qianqing Jiang Dianyi Liu zhejiang University Hangzhou 310013 Zhejiang ProvinceChina Key Laboratory of 3D Micro/Nano Fabrication and Characterization of zhejiang province Research Center for Industries of the Future and School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina

The challenges in transparent photovoltaic(TPV)fields are still that the device transparency and efficiency are difficult to be balanced to meet the requirements of practical *** this study,we systematically investigated the interrelationship between photovoltaic film properties,optical transmission,and photovoltaic performances in the near-infrared harvesting organic *** results indicate that the photovoltaic film thickness determines the TPV’s transparency and meanwhile affects the device efficiency;by contrast,the donor-acceptor ratio only affects device efficiency and has little effect on *** controlling the film thickness and donor-acceptor ratio,the average visible transmission(AVT)of TPVs can be precisely managed in the range of 40%-85%,and the device efficiency can achieve as high as 4.06%and 2.38%while the AVT exceeds 70%and 80%,***,the large area(~10 cm^(2))TPV modules and ultra-flexible devices were then successfully prepared based on the systematical study.

关键词： transparent transparency donor

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Optogenetics in oral and craniofacial research

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Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第8期25卷 656-671页

作者： Qinmeng ZHANG Luyao SONG Mengdie FU Jin HE Guoli YANG Zhiwei JIANG Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zhejiang UniversityHangzhou 310000China zhejiang University School of Medicine Hangzhou 310058China

Optogenetics combines optics and genetic engineering to control specific gene expression and biological functions and has the advantages of precise spatiotemporal control,noninvasiveness,and high *** modified photosensory sensors are engineered into proteins to modulate conformational changes with light ***,optogenetic techniques can provide new insights into oral biological processes at different levels,ranging from the subcellular and cellular levels to neural circuits and behavioral ***,we introduce the origins of optogenetics and highlight the recent progress of optogenetic approaches in oral and craniofacial research,focusing on the ability to apply optogenetics to the study of basic scientific neural mechanisms and to establish different oral behavioral test models in vivo(orofacial movement,licking,eating,and drinking),such as channelrhodopsin(ChR),archaerhodopsin(Arch),and halorhodopsin from Natronomonas pharaonis(NpHR).We also review the synergic and antagonistic effects of optogenetics in preclinical studies of trigeminal neuralgia and maxillofacial *** addition,optogenetic tools have been used to control the neurogenic differentiation of dental pulp stem cells in translational *** the scope of optogenetic tools is increasing,there are limited large animal experiments and clinical studies in dental *** future directions include exploring therapeutic strategies for addressing loss of taste in patients with coronavirus disease 2019(COVID-19),studying oral bacterial biofilms,enhancing craniomaxillofacial and periodontal tissue regeneration,and elucidating the possible pathogenesis of dry sockets,xerostomia,and burning mouth syndrome.

关键词： Lasers Cell differentiation Bacterial virulence Nervous system Neurophysiology Behavioral science

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Ultra-high specific surface area activated carbon from Taihu cyanobacteria via KOH activation for enhanced methylene blue adsorption

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Chinese Journal of Chemical engineering 2024年第3期67卷 106-116页

作者： Yifang Mi Wenqiang Wang Sen Zhang Yalong Guo Yufeng Zhao Guojin Sun Zhihai Cao Key Laboratory of Advanced Textile Materials and Manufacturing Technology and engineering research center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing&FinishingZhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory for Technology in Rural Water Management of zhejiang province Zhejiang University of Water Resources and Electric PowerHangzhou 310018China

Cyanobacteria-based activated carbon(CBAC)was successfully prepared by pyrolysis-activation of Taihu *** the impregnation ratio and activated temperature were 2 and 800-C,respectively,the optimal CBACs possessed an ultra-high specific surface(2178.90 m^(2)·g^(-1))and plenty of micro-and meso-pores,as well as a high pore volume(1.01 cm^(3)·g^(-1)).Ascribed to ultra-high surface area,π-π interaction,electrostatic interaction,as well as hydrogen-bonding interactions,the CBACs displayed huge superiority in efficient dye *** saturated methylene blue adsorption capacity by CBACs could be as high as 1143.4 mg·g^(-1),superior to that of other reported biomass-activated *** adsorption was endothermic and modeled well by the pseudo-second-order kinetic,intra-particle diffusion,and Langmuir *** work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.

关键词： Activated carbon Biomass Dye adsorption Taihu cyanobacteria

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High efficiency of Brillouin scattering behavior in single-mode Ge–As–Se–Te fibers at 2μm

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Chinese Physics B 2023年第5期32卷 449-456页

作者：付悦戴世勋徐路路方耀俊王莹莹焦凯王训四 Laboratory of Infrared Materials and Devices The Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Key Laboratory of Photoelectric Materials and Devices of zhejiang province Ningbo 315211China engineering research center for Advanced Infrared Photoelectric Materials and Devices of zhejiang province Ningbo 315211China Faculty of Electrical engineering and Computer Science Ningbo UniversityNingbo 315211China

The Brillouin characteristics of step-index Ge–As–Se–Te(GAST)fibers at 2μm are designed and simulated on the basis of optical and acoustic *** refractive indexes of Ge_(20)As_(20)Se_(45)Te_(15)glass and Ge_(20)As_(20)Se_(43)Te_(17)glass serving as fiber core and cladding are 3.20 and 3.18 at 2μm,and their acoustic velocities are 2200 m/s and 2300 m/s,*** results indicate that the stimulated Brillouin scattering(SBS)efficiency is 248 m^(-1)·W^(-1),and the Brillouin threshold power is 66 m W when the core diameter of the 2-m-long GAST fiber is 4μm at 2-μm *** optic–acoustic coupling factor,the Brillouin frequency shift,and the Brillouin gain coefficient are 0.98,7.02 GHz,and 3.81×10^(-9)m/W,*** SBS effect of GAST fibers simulated for the first time provides a new promising approach to selecting gain medium based on 2-μm-wavelength fiber laser.

关键词： stimulated Brillouin scattering chalcogenide fiber nonlinear effect optical–acoustic coupling

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Tuning mechanical behaviors of highly entangled hydrogels with the random distribution of mobile entanglements

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Applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 277-294页

作者： Jinlong LIU Di LU Bin CHEN Department of engineering Mechanics Zhejiang UniversityHangzhou 310027China Beijing System Design Institute of Electro-Mechanic engineering Beijing 100854China Intelligent Robotic research center Zhejiang LaboratoryHangzhou 310027China Key Laboratory of Soft Machines and Smart Devices of zhejiang province Hangzhou 311100China

Highly entangled hydrogels exhibit excellent mechanical properties,including high toughness,high stretchability,and low *** considering the evolution of randomly distributed entanglements within the polymer network upon mechanical stretches,we develop a constitutive theory to describe the large stretch behaviors of these *** the theory,we utilize a representative volume element(RVE)in the shape of a cube,within which there exists an averaged chain segment along each edge and a mobile entanglement at each *** employing an explicit method,we decouple the elasticity of the hydrogels from the sliding motion of their entanglements,and derive the stress-stretch relations for these *** present theoretical analysis is in agreement with experiment,and highlights the significant influence of the entanglement distribution within the hydrogels on their *** also implement the present developed constitutive theory into a commercial finite element software,and the subsequent simulations demonstrate that the exact distribution of entanglements strongly affects the mechanical behaviors of the structures of these ***,the present theory provides valuable insights into the deformation mechanism of highly entangled hydrogels,and can aid in the design of these hydrogels with enhanced performance.

关键词： highly entangled hydrogel constitutive theory entanglement gamma distribution

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