检索结果-南通市图书馆

Effect of Solvent Viscosity on the Driven Translocation of Charged Polymers through Nanopores

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第5期40卷 532-540页

作者： Han-Xian Hu Fan Wu Xiao Yang Chao Wang meng-bo Luo Department of Physics Zhejiang UniversityHangzhou 310027China Department of Physics Taizhou UniversityTaizhou 318000China

The effect of viscosity of non-translocated(cis)side,ηcis,on the driven translocation of charged polymers through nanopores is investigated using Langevin dynamics *** show that the translocation of polymer chains can be regulated by changingη***ηcis decreases,the translocation timeτdecreases,and the exponentδin the scaling relation with driving force f,τ~f-δ,increases whereasαin the scaling relation with chain length N,τ~Nα,***,the conformation of the polymer chain at the cis side gravitates towards an equilibrium *** results imply a relationship between the translocation and the conformation of polymer *** verify this hypothesis,we change the conformation of polymer by artificially relaxing the translocating polymer via adding an additional relaxation time in the simulation.A sufficient large additional relaxation time for the translocating polymer chain at the cis side only or at both cis and trans sides results in exponentsαandδboth close to 1,in contrast toα=1.36 andδ=0.8 for the translocation without the additional *** additional relaxation for the polymer chain at the cis side accelerates the translocation and plays a more important role than that for polymer chain at the trans side.

关键词： Polymer Nanopore Translocation Langevin dynamics simulation

NICKEL(Ⅱ)ion-intercalated MXene membranes for enhanced H_(2)/CO_(2) separation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2021年第4期15卷 882-891页

作者： Yiyi Fan Jinyong Li Saidi Wang Xiuxia meng Yun Jin Naitao Yang bo meng Jiaquan Li Shaomin Liu School of Chemical Engineering Shandong University of TechnologyZibo 255049China Department of Chemical Engineering Curtin UniversityPerthWA 6845Australia College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029China

Hydrogen fuel has been embraced as a potential long-term solution to the growing demand for clean energy.A membrane-assisted separation is promising in producing high-purity H_(2).Molecular sieving membranes(MSMs)are endowed with high gas selectivity and permeability because their well-defined micropores can facilitate molecular exclusion,diffusion,and *** this work,MXene nanosheets intercalated with Ni^(2+) were assembled to form an MSM supported on Al_(2)O_(3) hollow fiber via a vacuum-assisted filtration and drying *** prepared membranes showed excellent H_(2)/CO_(2) mixture separation performance at room *** factor reached 615 with a hydrogen permeance of 8.35×10^(-8) mol·m^(-2)·s^(-1) ·Pa^(-1).Compared with the original Ti_(3)C_(2)T_(x)/Al_(2)O_(3) hollow fiber membranes,the permeation of hydrogen through the Ni^(2+)-Ti_(3)C_(2)T_(x)/Al_(2)O_(3) membrane was considerably increased,stemming from the strong interaction between the negatively charged MXene nanosheets and Ni^(2+).The interlayer spacing of MSMs was tuned by Ni^(2+).During 200-hour testing,the resultant membrane maintained an excellent gas separation without any substantial performance *** results indicate that the Ni2+tailored Ti_(3)C_(2)T_(x)/Al_(2)O_(3) hollow fiber membranes can inspire promising industrial applications.

关键词： MXene H_(2)/CO_(2)separation nickel ions hollow fiber

The emerging roles of vacuolar-type ATPase-dependent Lysosomal acidification in neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2020年第2期9卷 189-202页

作者： Qiaoyun Song bo meng Haidong Xu Zixu Mao Department of Pharmacology and Chemical Biology Emory University School of MedicineAtlantaGA30322USA Department of Reproductive Genetics Hebei General HospitalShijiazhuangHebei Province050051People’s Republic of China Department of Neurology Emory University School of MedicineAtlantaGA30322USA

Background Lysosomes digest extracellular material from the endocytic pathway and intracellular material from the autophagic *** process is performed by the resident hydrolytic enzymes activated by the highly acidic pH within the lysosomal *** pH gradients are mainly maintained by the vacuolar(H+)ATPase(or V-ATPase),which pumps protons into lysosomal lumen by consuming *** of V-ATPase affects lysosomal acidification,which disrupts the clearance of substrates and leads to many disorders,including neurodegenerative *** body As a large multi-subunit complex,the V-ATPase is composed of an integral membrane V0 domain involved in proton translocation and a peripheral V1 domain catalyzing ATP *** canonical functions of V-ATPase rely on its H+-pumping ability in multiple vesicle organelles to regulate endocytic traffic,protein processing and degradation,synaptic vesicle loading,and coupled *** other non-canonical effects of the V-ATPase that are not readily attributable to its proton-pumping activity include membrane fusion,pH sensing,amino-acid-induced activation of mTORC1,and scaffolding for protein-protein *** response to various stimuli,V-ATPase complex can reversibly dissociate into V1 and V0 domains and thus close ATP-dependent proton *** of pH and lysosomal dysfunction have been linked to many human diseases,including neurodegenerative disorders such as Alzheimer disease,Parkinson’s disease,amyotrophic lateral sclerosis as well as neurodegenerative lysosomal storage *** V-ATPase complex is a universal proton pump and plays an important role in lysosome acidification in all types of *** V-ATPase dysfunction contributes to the pathogenesis of multiple neurodegenerative diseases,further understanding the mechanisms that regulate the canonical and non-canonical functions of V-ATPase will reveal molecular details of disease process and help assess V-ATPas

关键词： Vacuolar-type ATPase Lysosomal acidification Neurodegeneration Autophagy

Failure mechanism and stability control of a large section of very soft roadway surrounding rock shear slip

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

International Journal of Mining Science and Technology 2013年第1期23卷 127-134页

作者： meng bo Jing Hongwen Chen Kunfu Su Haijian State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology School of Mechanics and Civil Engineering China University of Mining & Technology

The measured data and simulation test phenomenon of surrounding rock deformation and failure at the project site indicate that shear failure which firstly occurs in surrounding rock, block slip and second shear failure are the root cause of deformation and damage of supporting structure of the surrounding rock at a large scale. We derived limit load of surrounding rock shear slip failure and reasonable support resistance of given load by means of shear slip line field theory, discussed the main factors which influence the limit load of surrounding rock. Shear slip line field and limit load of circular tunnel surrounding rock were obtained by means of physical simulation test, which agreed well with the theoretical analysis results. Based on the theoretical analysis and physical simulation test, the cause deformation and failure at large scale of Xinshanghai No. 1 coal mine big section ingate was analyzed, and the shear failure resistance and block slip in surrounding rock were proposed as the core technical supporting ideas. Proper range of supporting resistance which came from calculation was suggested. The support scheme which is mainly composed of large grouting anchor, sprayed anchor net support technique and full-face grille concrete finally ended the dilemma of repeated failure and mending of ingate and created critical conditions for smooth production in the coal mine.

关键词： Rock mechanics Surrounding rock Shear and slip Shear and slip resistance Limit load

Translocation time of a polymer chain through an energy gradient nanopore

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2017年第3期12卷 157-165页

作者： meng-bo Luo Shuang Zhang Fan Wu Li-Zhen Sun Department of Physics Zhejiang University Hangzhou 310027 China College of Science Qinzhou University Qinzhou 535011 China Department of Applied Physics Zhejiang University of Technology Hangzhou 310023 China

The translocation time of a polymer chain through an interaction energy gradient nanopore was studied by Monte Carlo simulations and the Fokker-Planck equation with double-absorbing boundary condi- tions. both the simulation and calculation revealed three different behaviors for polymer translocation. These behaviors can be explained qualitatively from free-energy landscapes obtained for polymer translocation at different parameters. Results show that the translocation time of a polymer chain through a nanopore can be tuned by suitably designing the interaction energy gradient.

关键词： polymer chain translocation time nanopore Monte Carlo simulation Fokker-Planck equation

Investigation and characterization of an arc-shaped piezoelectric generator

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

Science China(Technological Sciences) 2013年第11期56卷 2636-2641页

作者： HAN mengDi LIU Wen ZHANG XiaoSheng meng bo ZHANG HaiXia Institute of Microelectronics Peking University Peking University Shenzhen Graduate School

A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically *** a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μ*** maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 *** influence of frequency,size dimension and load resistance are investigated through experimental *** this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.

关键词： piezoelectric generator arc-shaped PVDF high output self-powered system

Translocation of a Self-propelled Polymer through a Narrow Pore

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第12期40卷 1670-1678,I0010页

作者： Chao Wang Han-Xian Hu Yan-Li Zhou Bin Zhao meng-bo Luo Department of Physics Taizhou UniversityTaizhou 318000China Department of Physics Zhejiang UniversityHangzhou 310027China

Recent studies indicate that active polymers often show curious conformational and dynamical ***,rigid polymers with self-propelled tangential forces can move directionally and even push a *** by this,the tran slocation of an active bead-spring polymer through a narrow pore is studied simulationly in this *** bead of the polymer is propelled by a tangential active force(f) along the contour of the *** results show that the active polymer translocates through the pore in a railway-motion *** tran slocation velocity v of the polymer is determined only by f,resulting that the translocation time(r) as a function of the polymer length(N)and the active force fcan be expressed as τ∝ Nf,which is independent of the rigidity of the *** results indicate that the tran slocation dynamics of active polymers is quite different from that of passive polymers.

关键词： Active polymer Translocation Dynamics Simulation

Practical Internet Voting Protocol without Strong Physical Assumption

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2007年第1期12卷 177-180页

作者： meng bo ZHANG Huanguo School of Computer South-Central University for Nation-alities Wuhan 430074 Hubei China School of Computer Wuhan University Wuhan 430072Hubei China

Internet voting protocols is the base of the Internet voting systems. In this paper a new practical Internet voting protocol is introduced. The proposed Internet voting protocol does not apply the strong physical assumptions and has the properties of privacy, completeness, soundness, fairness, invariableness, and universal verifiability, receipt-free and coercion-resistant. At the same time it solves some problems in other internet voting protocols and the verification progress of universal verifiability is simple and efficient.

关键词： information security voting protocol protocol security

Simulation Study on the Extension of Semi-flexible Polymer Chains in Cylindrical Channel

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第12期37卷 1290-1297,I0008页

作者： Yu Fu Fan Wu Jian-Hua Huang Ying-Cai Chen meng-bo Luo Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Department of Chemistry Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Taizhou UniversityTaizhou 318000China

The scaling relations among the mean end-to-end distance of polymer along the channel,the polymer length N,and the effective diameter of channel De were investigated for flexible and semi-flexible polymer chains confined in long cylindrical *** the flexible polymer chain,scaling relation~NDe–0.7 was found in the classic de Gennes regime at lp2/bbond length,and Rg the radius of gyration of *** the semi-flexible polymer,~NDe–1 in the transition regime lp1)and~De–0.7 in the classic de Gennes regime at larger De>xlp were *** simulation results revealed that the scaling relation in the transition regime was due to the rod-like behavior of the semi-flexible polymer in the small regime lp

关键词： Semi-flexible polymer Cylindrical channel Conformation Scaling relation Monte Carlo simulation