检索结果-南通市图书馆

A chitosan/amido-graphene oxide-based self-powered humidity sensor enabled by triboelectric effect

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第8期40卷 1995-2003页

作者： Bo-Hao Liu Guang-Zhong Xie Cheng-Zhen Li Si Wang Zhen Yuan zai-hua duan Ya-Dong Jiang Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu610054China

In this work,amido-graphene oxide(GO-NH_(2))loaded chitosan(CTS)composite material(CTS/GO-NH_(2))that acts as both the triboelectric and sensing film was prepared on rotary fan-shaped triboelectric nanogenerator for humidity *** with the pristine CTSbased triboelectric humidity sensor(CTS-THS)and GONH_(2)-THS,the CTS/GO-NH_(2)-based humidity sensor exhibited higher humidity response and better linearity in the relative humidity(RH)range of 18.7%RH-91.5%*** above results can be explained by the massive exposed and less concealed hydrophilic functional groups of CTS with the help of the wrinkle structure of GO-NH_(2).Meanwhile,the CTS/GO-NH_(2)-THS possessed good repeatability and acceptable hysteresis(~6.2%RH).Finally,a humidity sensing mechanism coupling triboelectric contact charging effect with electrons transfer principle under moisture environment was established to interpret the enhanced humidity sensing performance of the composite film-based *** work demonstrates that CTS/GONH_(2) composite film can be utilized to fabricate humidity sensors based on the triboelectric effect.

关键词： Chitosan Amido-graphene oxide Triboelectric nanogenerator Humidity sensors Hydrogen bonding interaction

Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS_(2) nanoparticles

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第7期40卷 1762-1767页

作者： zai-hua duan Qiu-Ni Zhao Cheng-Zhen Li Si Wang Ya-Dong Jiang Ya-Jie Zhang Bo-Hao Liu Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Most resistance-type humidity sensors exhibit negative humidity sensitivity,i.e.,their resistance decreases with a corresponding increase in *** is primarily attributed to the dominant role of ionic conduction in adsorbed *** this work,a humidity sensor based on a p-type reduced graphene oxide(p-rGO)with positive humidity sensitivity is ***,its positive humidity sensing response is further enhanced by n-type WS_(2) nanoparticles *** results show that both rGO and r GO/WS_(2) humidity sensors have good linear response in the relative humidity(RH)range of0%-91.5%.The sensitivity of the rGO/WS_(2) humidity sensor is 1.87 times that of rGO humidity sensor,which is mainly attributed to p-n heterojunction between rGO and WS_(2).Besides,the r GO/WS_(2) humidity sensor has small humidity hysteresis(-3%RH)and good *** work demonstrates a humidity sensor based on rGO/WS_(2) composite film and provides a facile route for fabricating humidity sensor with positive humidity sensing properties.

关键词： Reduced graphene oxide WS2 nanoparticles Heterojunction Humidity sensor Humidity sensing mechanism

Small extracellular vesicles derived from human induced pluripotent stem cell-differentiated neural progenitor cells mitigate retinal ganglion cell degeneration in a mouse model of optic nerve injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 587-597页

作者： Tong Li Hui-Min Xing Hai-Dong Qian Qiao Gao Sheng-Lan Xu hua Ma zai-Long Chi State Key Laboratory of Ophthalmology Optometry and Visual ScienceEye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina National Clinical Research Center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina

Several studies have found that transplantation of neural progenitor cells(NPCs)promotes the survival of injured ***,a poor integration rate and high risk of tumorigenicity after cell transplantation limits their clinical *** extracellular vesicles(sEVs)contain bioactive molecules for neuronal protection and *** studies have shown that stem/progenitor cell-derived sEVs can promote neuronal survival and recovery of neurological function in neurodegenerative eye diseases and other eye *** this study,we intravitreally transplanted sEVs derived from human induced pluripotent stem cells(hiPSCs)and hiPSCs-differentiated NPCs(hiPSC-NPC)in a mouse model of optic nerve *** results show that these intravitreally injected sEVs were ingested by retinal cells,especially those localized in the ganglion cell *** with hiPSC-NPC-derived sEVs mitigated optic nerve crush-induced retinal ganglion cell degeneration,and regulated the retinal microenvironment by inhibiting excessive activation of *** analysis further revealed that hiPSC-NPC derived sEVs transported neuroprotective and anti-inflammatory miRNA cargos to target cells,which had protective effects on RGCs after optic nerve *** findings suggest that sEVs derived from hiPSC-NPC are a promising cell-free therapeutic strategy for optic neuropathy.

关键词： exosome miRNA neural progenitor cell neurodegeneration neuroinflammation neuroprotection optic nerve crush optic neuropathy retinal ganglion cell small extracellular vesicles

On a risk model with Markovian arrivals and tax

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2012年第2期27卷 150-158页

作者： DONG hua LIU zai-ming School of Mathematics Qufu Normal UniversityQufu 273165China School of Mathematics Central South UniversityChangsha 410075China

A risk model with Markovian arrivals and tax payments is *** the insurer is in a profitable situation,the insurer may pay a certain proportion of the premium income as tax ***,the Laplace transform of the time to cross a certain level before ruin is ***,explicit formulas for a generalized Gerber-Shiu function are established in terms of the＇original＇Gerber-Shiu function without tax and the Laplace transform of the first passage time before ***,the differential equations satisfied by the expected accumulated discounted tax payments until ruin are *** explicit expression for the discounted tax payments is also given.

关键词： Markovian arrival process Gerber-Shiu function tax payment.

Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第2期35卷 351-363页

作者： Huina Wang Xiaoxia duan Xin Feng zai-Sha Mao Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The main spatial distribution features of shear rate in a stirred tank operated with five different radial and axial flow impellers were presented with particle image velocimetry(PIV)*** only the average shear rate in the whole tank but also the local value in the vicinity of impeller increases linearly with impeller ***,the shear coefficient(Ks,imp)at the impeller outlet is linearly related to the impeller flow number(Nq)and decreases with the increase of Nq in general at the constant power consumption per unit volume(Pv).During scale-up based on the constant Pv and geometric similarity,CFD results show that the volume-averaged shear rate(cavg)for RDT decreases faster than that of other impellers with the impeller tip velocity(Utip).The novel multi-blade combined(MBC)impeller with the increased height-to-diameter ratio of the stirred tank is able to more effectively improve the distribution uniformity of shear rate at the same Pv after *** studies provide a data basis for selecting the impeller types and improving the shear rate environment in the large-scale stirred tank.

关键词： Particle image velocimetry Shear rate distribution Constant power consumption per unit volume Computational fluid dynamics Scale-up

Effect of Primary Factor on Cavitation Resistance of Some Austenitic Metals

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2003年第3期10卷 54-58页

作者： WANG zai-you ZHU Jin-hua Xi’an Jiaotong University

A new experimental method was developed to simulate the generation of the surface transversal crack on the continuous casting slab with a discontinuous sample. A high temperature property of steel named 'the sensitivity to the stress concentration of steel at high temperature' was defined to evaluate the effect of stress concentration on thermal plasticity of steel. 'The sensitivity parameter to the stress concentration of steel at high temperature' was available to determine the temperature range in which steel is sensitive to the stress concentration.

关键词： stress concentration continuous casting surface crack high temperature property

Pyrolyzed Iron Phthalocyanine-Modified Multi-Walled Carbon Nanotubes as Composite Anode in Marine Sediment Microbial Fuel Cells and Its Electrochemical Performance

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2019年第6期18卷 1395-1401页

作者： zai Xuerong duan Zhiwei CHEN Wei YU Jian FU Yubin College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Improving the performance of anode is a crucial step for increasing output power of marine sediment microbial fuel cells(MSMFCs)to drive marine monitor to work for a long term on the ocean floor.A pyrolyzed iron phthalocyanine modified multi-walled carbon nanotubes composite(FePc/MWCNTs)has been utilized as a novel nodified anode in the *** structure of the composite modified anode and electrochemical performance have been investigated respectively in the *** is a substantial improvement in electron-transfer efficiency from the bacteria biofilm to the modified anode via the pyrolyzed FePc/MWCNTs composite based on their cyclic voltammetry(CV)and Tafel *** electron transfer kinetic activity of the FePc/MWCNTs-modified anode is 1.86 times higher than of the unmodified *** maximum power density of the modified MSMFC was 572.3±14 m W m^-2,which is 2.6 times larger than the unmodified one(218.3±11 m W m^-2).The anodic structure and cell scale would be greatly minimized to obtain the same output power by the modified MSMFC,so that it will make the MSMFC to be easily deployed on the remote ocean ***,it would have a great significance for us to design a novel and renewable long term power ***,a novel molecular synergetic mechanism is proposed to elucidate its excellent electrochemical performance.

关键词： marine sediment microbial fuel cells iron phthalocyanine/multi-walled carbon nanotube composite modified anode electrochemical kinetics power density

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第10期50卷 95-107页

作者： Zhuotai Jia Lele Xu Xiaoxia duan zai-Sha Mao Qinghua Zhang Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemical Engineering Nanjing Tech UniversityNanjing 211816China

To reduce the power consumption and improve the mixing performance in stirred tanks,two improved disc turbines namely swept-back parabolic disc turbine(SPDT)and staggered fan-shaped parabolic disc turbine(SFPDT)are *** validation of computational fluid dynamics(CFD)model with experimental results,CFD simulations are carried out to study the flow pattern,mean velocity,power consumption,pumping capacity and mixing efficiency of the improved and traditional impellers in a dished-bottom tank under turbulent flow conditions,The results indicate that compared with the commonly used parabolic disc turbine(PDT),the power number of proposed SPDT and SFPDT impellers is reduced by 43%and 12%,and the pumping efficiency is increased by 68%and 13%,***,under the same power consumption(0-700 W·m^(-3)),the mixing performance of both SPDT and SFPDT is also superior to that of Rushton turbine and PDT.

关键词： Flow regime Mixing time Stirred vessel Computational fluiddynamics Improved discturbine

A Fractional-Order Phase-Locked Loop with Time-Delay and Its Hopf Bifurcation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第11期30卷 1-5页

作者： YU Ya-Juan WANG zai-hua State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016 School of Mathematics and Physics Changzhou UniversityChangzhou 213164 Institute of Science PLA University of Science and TechnologyNanjing 211101

A fractional-order phase-locked loop(PLL)with a time-delay is firstly proposed on the basis of the fact that a capacitor has *** existence of Hopf bifurcation of the fractional-order PLL with a time-delay is investigated by studying the root location of the characteristic equation,and the bifurcated periodic solution and its stability are studied simply by using"pseudo-oscillator analysis".The results are checked by numerical *** is found that the fractional-order PLL with a time-delay reduces the locking time,and it minimizes the amplitude of the bifurcated periodic solution when the order is properly chosen.

关键词： fractional Hopf delay