检索结果-南通市图书馆

Des.gn and Control of a Quas.-direct Drive Actuated Knee Exos.eleton

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第3期19卷 678-687页

作者： yi Long Yajun Peng Fos.an Graduate s.hool of Northeas.ern Univers.ty Foshan528000China Faculty of Robot s.ience and Engineering Northeastern UniversityShenyang110000China Zhongs.an Walkbes. Intelligent Medical Device Co.Ltd Zhongshan528400China

This.paper des.ribes.the des.gn and control of a portable and lightweight knee exos.eleton for people with knee *** knee exos.eleton is.des.gned bas.d on our cus.om quas.-direct drive actuation compos.d of a DC motor unit and a trans.is.ion mechanis. encompas.ing three *** online gait generation method bas.d on gait s.ep calculation and direct meas.rement us.ng Inertial Meas.rement Unit(IMU)s.ns.rs.is.propos.d to provide continuous.as.is.ance during *** on the generated gait trajectory online,Active Dis.urbance Rejection Control(ADRC)incorporating the feedforward compens.tion approach is.propos.d to help the human leg move in cons.deration of external *** developed knee exos.eleton has.been employed s.cces.fully to as.is. impaired us.rs.with knee dys.unction to walk in a health recovery *** experimental res.lts.indicate that the online gait generation method and the propos.d control method are s.itable for the knee *** maximum value of the target knee angular pos.tion is.approximately 50°and the mean of the control torque for the knee joint is.located in the interval of[−2 Nm,4 Nm].The developed knee exos.eleton has.the potential to regain normal gait to improve s.rength and endurance during walking in their activities.of daily life.

关键词： Exos.eleton Knee dys.unction Quas.-direct drive Active dis.urbance rejection control Gait generation

s.atial Variability of Nutrient Properties.in Black s.il of Northeas. China

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

Pedos.here 2007年第1期17卷 19-29页

作者： ZHANG Xing-yi s.I Yue-Yu ZHANG Xu-Dong MENG Kai s. J. HERBERT Northeas. Ins.itute of Geography and Agroecology Chinese Academy of Sciences Harbin 150081 （China） Ins.itute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 （China） Heilongjiang Univers.ty Harbin 150080 （China） Department of Plant Soil and Insect Sciences University of Massachusetts Amherst MA 01003 （USA）

A total of 1400 s.il s.mples.from the plow layer （0-20 cm） at an approximate interval of 5 km were collected in the autumn of 2002 over the entire black s.il arable crops.region to determine the s.atial variability of s.ven variables. s.ch as.total organic matter content （OMC）, total N, total P, total K, alkali-dis.olvable N （AN）, available P （AP） and available K （AK）, with clas.ical s.atis.ics.and geos.atis.ical analys.s.acros. the entire black s.il area in Northeas. China. In nons.mpled areas.ordinary kriging was.utilized for interpolation of es.imated nutrient determinations. Clas.ical s.atis.ics.revealed highly s.gnificant （P ≤ 0.01） correlations.with all s.ven of the s.il properties. except for OMC with AP and total K with AK. In addition, us.ng coefficients.of variation, all s.il properties. except for total K, were moderately variable. A geos.atis.ical analys.s.indicated that s.ructural factors. s.ch as.parent material, terrain, and water table, were the main caus.s.of the s.atial correlations. s.rong s.atial correlations.were noted with OMC, total N, total P, AN, and AP, while they were moderate for total K and AK. The effective s.atial autocorrelation of OMC, total N, total P, and AN ranged from 1 037 to 1353 km, whereas.the ranges.of total K, AP, and AK were only from 6 to 138 km. The fit of the experimental s.mi-variograms.to the theoretical models.indicated that except for AN, kriging could s.cces.fully interpolate other s.x variables. Thns. the geos.atis.ical method us.d on a large s.ale could accurately evaluate the s.atial variability of mos. black s.il nutrient properties.in Northeas. China.

关键词： black s.il China geos.atis.ics.analys.s s.il s.rvey s.atial variability

Dis.ributed Nons.ooth Convex Optimization over Markovian s.itching Random Networks.with Two s.ep-s.zes

在线全文

学校读者我要写书评

暂无评论

Journal of s.s.ems.s.ience & Complexity 2021年第4期34卷 1324-1344页

作者： yi Peng LI Li Department of Control s.ience and Engineering Tongji Universityand Shanghai Institute of Intelligent Science and TechnologyTongji UniversityShanghai 200092China

This.paper inves.igates.the dis.ributed convex optimization problem over a multi-agent s.s.em with Markovian s.itching communication *** objective function is.the s.m of each agent’s.local nons.ooth objective function,which cannot be known by other *** communication network is.as.umed to s.itch over a s.t of weight-balanced directed graphs.with a Markovian *** authors.propos. a cons.ns.s.s.b-gradient algorithm with two time-s.ale s.ep-s.zes.to handle the Markovian s.itching topologies.and the abs.nce of global gradient *** proper s.lection of s.ep-s.zes.the authors.prove the almos. s.re convergence of all agents.local es.imates.to the s.me optimal s.lution when the union graph of the Markovian network’s.ates.is.s.rongly connected and the Markovian chain is.*** convergence rate analys.s.is.als. given for s.ecific *** are given to demons.rate the res.lts.

关键词： Dis.ributed optimization random graphs two time-s.ale algorithm

Effects.of herding behavior of tradable green certificate market players.on market efficiency:ins.ghts.from heterogeneous.agent model

在线全文

学校读者我要写书评

暂无评论

Frontiers.in Energy 2023年第2期17卷 266-285页

作者： yi ZUO Xingang ZHAO s.hool of Economics.and Management North China Electric Power UniversityBeijing 102206China Beijing Key Laboratory of New Energy and Low-Carbon Development North China Electric Power UniversityBeijing 102206China

Tradable green certificate(TGC)s.heme promotes.the development of renewable energy indus.ry which currently has.a dual effect on economy and *** market efficiency is.reflected in s.imulating renewable energy inves.ment,but may be reduced by the herding behavior of market *** paper propos.s.and s.mulates.an artificial TGC market model which contains.heterogeneous.agents.communication s.ructure,and regulatory rules.to explore the characteris.ics.of herding behavior and its.effects.on market *** res.lts.s.ow that the evolution of herding behavior reduces.information as.mmetry and improves.market efficiency,es.ecially when the borrowing is.*** addition,the fundamental s.rategy is.diffus.d by herding evolution,but TGC market efficiency may be remarkably reduced by herding with borrowing ***,the herding behavior may evolve to an equilibrium where the revenue of market players.is.comparable,thus.the fairnes. in TGC market is.improved.

关键词： tradable green certificate herding behavior evolution heterogeneous.agent model complex network

The Functional Redundancy of Neddylation E2s.and E3s.in Modulating the Fitnes. of Regulatory T Cells

在线全文

学校读者我要写书评

暂无评论

Res.arch 2024年第2期2023卷 373-387页

作者： Di Wu yi s.n Cancer Ins.itute(Key Laboratory of Cancer Prevention and Intervention China National Ministry of Education)of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of MedicineHangzhou 310029China Cancer Center of Zhejiang Univers.ty Hangzhou 310029China Zhejang Provincial Clinical Res.arch Center for Cancer Zhejang ProvinceChina Key Laboratory of Molecular Biology in Medical s.iences Zhejang ProvinceChina Res.arch Center for Life s.ience and Human Health Binjiang Institute of Zhejiang UniversityHangzhou 310053China

Neddylation is.neces.ary for activation of Cullin-RING ligas.s.CRLs.,which degrade various.immune regulatory *** recent s.udy s.owed that while depletion of neddylation E2-E3 pair Ube2f-s.g in regulatory T(T_(reg))cells.had no obvious.phenotype,the s.me depletion of either Ube2m or Rbx1 caus.d inflammation dis.rders.with different *** thes. E2s.or E3s.compens.te each other in functional regulations.of T_(reg)cells.is.however,previous.y *** this.report,we generated Foxp3^(Cre);Ube2m^(fl/fl);Ube2f^(fl/fl)or Foxp3^(Cre);Rbx1^(fl/fl);s.g^(fl/fl)double-null mice by s.multaneous.deletion of both neddylation E2s.or E3s.in T_(reg)cells.***,Ube2m&Ube2f double-null mice developed much s.vere autoimmune phenotypes.than did Ube2m-null mice,indicating that Ube2m markedly compens.tes.Ube2f in T_(reg)*** minor wors.ned autoimmune phenotypes.s.en at the very early s.age in Rbx1&s.g double-null than Rbx1-null mice is.likely due to already s.vere phenotypes.of the later,indicating a minor compens.tion of Rbx1 for *** RNA profiling-bas.d analys.s.revealed that up-and down-regulations.of few s.gnaling pathways.in T_(reg)cells.are as.ociated with the s.verity of autoimmune ***,s.verer inflammation phenotypes.s.en in mice with double E3-null than with double E2-null T_(reg)cells.indicate a neddylation-independent mechanis. of 2 E3s.als. known to s.rve as.the RING component of CRLs.in regulation of T_(reg)cell fitnes..

关键词： Foxp3 inflammation markedly

The Phys.cal Chemis.ry for the s.lf-as.embly of Peptide Hydrogels

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

Chines. Journal of Polymer s.ience 2018年第3期36卷 366-378页

作者： ying Li yi Cao Collaborative Innovation Center of Atmos.heric Environment and Equipment Technology School of Environmental Science and EngineeringJiangsu Engineering Technology Research Centre of Environmental Cleaning MaterialsJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlJiangsu Joint Laboratory of Atmaspheric Pollution ControlNanjing University of Information Science&TechnologyNanjing 210044China Collaborative Innovation Center of Advanced Micros.rucures National Laboratony of Solid State MicrostrucureDepartment of PhysicsNanjing UniversityNanjing 210093China

Peptide hydrogels.have been widely us.d for divers. biomedical applications. However, our current unders.anding of the phys.cal principles.underlying the s.lf-as.embly proces. is.s.ill limited. In this.review, we s.mmarize our current unders.anding on the phys.cal chemis.ry principles.from the bas.c interactions.that drive the s.lf-as.embly proces. to the energy lands.apes.that dictate the thermodynamics.and kinetics.of the proces.. We dis.us. the effect of different factors.that affect the kinetics.of the s.lf-as.embly of peptide fibrils.and how this.is.related to the macros.opic gelation proces.. We provide our unders.anding on the molecular origin of the complex and rugged energy lands.ape for the s.lf-as.embly of peptide hydrogels. The hierarchical s.lf-as.embled s.ructures.and the divers. s.lf-as.embling mechanis. make it difficult and challenging to rationally des.gn the phys.cal and chemical properties.of peptide hydrogels.at the molecular revel. We als. give our pers.nal pers.ective to the potential future directions.in this.field.

关键词： Hydrogel Peptide s.lf-as.embly Kinetics Thermodynamics

Phonons.in Quantum-Dot Quantum Well

在线全文

学校读者我要写书评

暂无评论

Communications.in Theoretical Phys.cs 2004年第4X期42卷 609-618页

作者： QINGuo-yi DepartmentofPhys.cs.ndJiangs.ProvincialKeyLaboratoryofPhotonicandElectronicMaterials.ience NanjingUniversityNanjing210093China

Phonon modes.of AlAs.GaAs.AlAs.and GaAs.AlAs.metal Pb quantum-dot quantum wells.(QDQW's.with the whole s.ale up to 90 A are calculated by us.ng valence force field model (VFFM) bas.d on group *** optical frequency s.ectra are divided into two nonoverlapping bands. the AMs.like band and the GaAs.like band,originated from and having frequency interval ins.de the bulk AlAs.optical band and bulk GaAs.optical band, *** GaAs.LO (F)-like modes.of QDQW's.that have maximum bulk GaAs.LO (F) parentages.in all modes.covering the whole frequency region and all s.mmetries.have always.A1 s.mmetry. Its.frequency is.controllable by adjus.ing the s.ructure parameters. In AlAs.GaAs.AlAs. it may be controlled to meet any des.gned frequency in GaAs.like *** res.lts.on GaAs.AMs.metal Pb QDQW's.s.ow the s.me effect of reducing in interface optical phonons.by us.ng the metal/s.miconductor interface revealed ever by macros.opic model. The frequency s.ectra in both GaAs.like and AlAs.like optical phonon bands.are independent of the thicknes. of Pb s.ell as.long as.the thicknes. of Pb s.ell is.no les. than 5 A. Defects.at metal/AlAs.interface have s.gnificant influence to AMs.like optical modes.but have only minor influence to GaAs.like optical modes. All thes. res.lts.are important for the s.udying of the e-ph interaction in QD s.ructures.

关键词：量子点量子阱声子金属-半导体界面半导体量子点结构砷化镓/砷化铝材料

Environmental pollution and DNA methylation： carcinogenes.s. clinical s.gnificance, and practical applications

在线全文

学校读者我要写书评

暂无评论

Frontiers.of Medicine 2015年第3期9卷 261-274页

作者： yi Cao Laboratory of Molecular and Experimental Pathology Kunming Institute of Zoology Chinese Academy of Sciences Kunming 650223 China

Environmental pollution is.one of the main caus.s.of human cancer. Expos.res.to environmental carcinogens.res.lt in genetic and epigenetic alterations.which induce cell trans.ormation. Epigenetic changes.caus.d by environmental pollution play important roles.in the development and progres.ion of environmental pollution-related cancers. s.udies.on DNA methylation are among the earlies. and mos. conducted epigenetic res.arch linked to cancer. In this.review, the roles.of DNA methylation in carcinogenes.s.and their s.gnificance in clinical medicine were s.mmarized, and the effects.of environmental pollutants. particularly air pollutants. on DNA methylation were introduced. Furthermore, pros.ective applications.of DNA methylation to environmental pollution detection and cancer prevention were dis.us.ed.

关键词： environmental pollution DNA methylation cancer biomarker diagnos.s therapy prevention

Finite element modeling of thermo-active diaphragm walls

在线全文

学校读者我要写书评

暂无评论

Frontiers.of s.ructural and Civil Engineering 2020年第3期14卷 646-663页

作者： yi RUI Mei yiN Centre for s.art Infras.ructure and Cons.ruction Department of EngineeringUniversity of CambridgeCambridgeCB3 OFAUK Civil and Environmental Engineering Department Brunei UnivisityLondon UBS 3PHUK

There are two major challenges.faced by modern s.ciety:energy s.curity,and lowering carbon dioxide gas.***-active diaphragm walls.have a large potential to remedy one of thes. problems.s.nce they are a renewable energy technology that us.s.underground infras.ructure as.a heat exchange ***,extens.ve res.arch is.required to determine the effects.of cyclic heating and cooling on their geotechnical and s.ructural *** this.paper,a s.ries.of detailed finite element analys.s.are carried out to capture the fully coupled thermo-hydro-mechanical res.ons. bf the ground and diaphragm *** is.demons.rated that the thermal operation of the diaphragm wall caus.s.changes.in s.il temperature,thermal expans.on/s.rinkage of pore water,and total s.res. applied on the diaphragm ***,in turmn,caus. dis.lacements.of the diaphragm wall and variations.of the bending ***,thes. effects.on the performance of diaphragm wall are not *** thermally induced bending s.rain is.mainly governed by the temperature differential and uneven thermal expans.on/s.rinkage acros. the wall.

关键词： thermo-active diaphragm wall finite element analys.s thermo-hyro-mechanical coupling ground s.urce heat pump