检索结果-南通市图书馆

Facile synthesis of hierarchical Ni_(3)Se_(2) nanodendrite arrays for supercapacitors

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第19期54卷 69-76页

作者： Licheng Zhao Ping zhang Yanan zhang zhi Zhang Lei Yang zhi-Gang Chen School of Materials Science&Engineering Sichuan UniversityChengdu 610064China Center for Nanoscale Characterization&Devices(CNCD) School of Physics&Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Centre for Future Materials University of Southern QueenslandSpringfieldQueensland4300Australia

Rational design has been widely used to develop high-performance metal selenides-based electrode materials for supercapacitors.In this study,we develop a facile one-step solvothermal approach to synthesize binder-free Ni_(3)Se_(2) nanodendrite arrays grown on nickel foam as advanced positive electrodes for supercapacitors.Our Ni_(3)Se_(2) nanodendrite arrays on nickel foam exhibit a specific capacitance of 1234 Fg^(-1)(3.70 F cm^(-2))at a current density of 1 Ag^(-1) and a great rate capability,which is benefited from the excellent electrical conductivity and unique hierarchical nano-dendritic structure.Furthermore,an asymmetric supercapacitor device was assembled using activated carbon as the negative electrode and the Ni_(3)Se_(2) nanodendrite arrays on nickel foam as the positive electrode,obtaining a high energy density of 22.3 W h kg^(-1) at a power density of 160.4 W kg^(-1).

关键词： Ni3Se2 Nanodendrite Binder-free Capacitance Supercapacitors

Impact of pediatric traumatic brain injury on hippocampal neurogenesis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第5期16卷 926-933页

作者： Mariam Rizk Justin Vu zhi Zhang Department of Natural Sciences University of Michigan-DearbornDearbornMIUSA

Traumatic brain injury(TBI)is a major cause of mortality and morbidity in the pediatric population.With advances in medical care,the mortality rate of pediatric TBI has declined.However,more children and adolescents are living with TBI-related cognitive and emotional impairments,which negatively affects the quality of their life.Adult hippocampal neurogenesis plays an important role in cognition and mood regulation.Alterations in adult hippocampal neurogenesis are associated with a variety of neurological and neurodegenerative diseases,including TBI.Promoting endogenous hippocampal neurogenesis after TBI merits significant attention.However,TBI affects the function of neural stem/progenitor cells in the dentate gyrus of hippocampus,which results in aberrant migration and impaired dendrite development of adult-born neurons.Therefore,a better understanding of adult hippocampal neurogenesis after TBI can facilitate a more successful neuro-restoration of damage in immature brains.Secondary injuries,such as neuroinflammation and oxidative stress,exert a significant impact on hippocampal neurogenesis.Currently,a variety of therapeutic approaches have been proposed for ameliorating secondary TBI injuries.In this review,we discuss the uniqueness of pediatric TBI,adult hippocampal neurogenesis after pediatric TBI,and current efforts that promote neuroprotection to the developing brains,which can be leveraged to facilitate neuroregeneration.

关键词： adult hippocampal neurogenesis astrocytes development microglia neuroinflammation neuroregeneration oxidative stress pediatric traumatic brain injury plasticity stem cell

Investigation on catalytic distillation for ethyl acetate production with different catalytic packing structures

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第1期53卷 63-72页

作者： zhiwei Wang Yu zhang zhi Zhang Daowei Zhou zhikai Cao Yong Sha Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

The catalytic packing is the core component of the catalytic distillation,and how the catalyst exists in the packing has significant influence on the process.To investigate the effect of catalyst packings on the catalytic distillation process,the classical ethyl acetate reactive distillation system was utilized,and a supported catalytic packing(SCP)was prepared in comparison with the conventional tea-bag catalytic packing(TBP).Laboratory scale experiments showed that the ethyl acetate conversion of the SCP was superior to the TBP at a low catalyst loading.The effects of reaction kinetics,mass transfer performance and actual catalytic efficiency of the packings on this process were regarded as reasons and studied by combining the experiments and numerical simulation.Results suggested that the relatively immediate“in-situ separation”caused by the rapid reaction kinetics and better mass transfer performance of SCP may be a main reason for the difference of the conversion.

关键词： Catalytic packing Ethyl acetate Catalytic distillation Mass transfer Esterification Reaction kinetics

Prescribed Error Performance Control for Second-Order Fully Actuated Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2022年第2期35卷 660-669页

作者： LI zhi zhang Ying zhang Rui School of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Electronic and Communication Engineering Shenzhen PolytechnicShenzhen 518055China

In this paper,the prescribed error trajectory control is proposed for second-order fully actuated systems.At first,by taking advantage of the full-actuation property,an intermediate control law is designed such that the intermediate closed-loop system is in a very simple form.Then,by utilizing the initial conditions of system states and the prescribed error performance function,the intermediate control law is developed to force the tracking error of the system on the proposed sliding mode surface from the beginning.The overall control law is obtained by combining the aforementioned steps.It is revealed that under the designed control law,the tracking error of the closed-loop system converges to zero along the prescribed error trajectory.Finally,an example is provided to validate the effectiveness of the presented approach.

关键词： Fully actuated systems prescribed error trajectory slide mode surface

Fundamental Groups of Real Toric Spaces over Simple Polytopes

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第10期38卷 1887-1900页

作者： zhi LU Song zhang School of Mathematical Sciences Fudan UniversityShanghai 200433P.R.China

In this paper we study the cubical stuctures and fundamental groups of real toric spaces.We give an explicit presentation of the fundamental group of the real toric space over a simple polytope.Then using this presentation,we give a description of the existence of non-degenerate colourings on a simple polytope from a homotopy point of view.

关键词： Real toric space fundamental group simple polytope real Buchstaber invariant

Reconstructing early transmission networks of SARS-CoV-2 using a genomic mutation model

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2023年第3期44卷 494-504页

作者： Chao-Yuan Cheng zhi-Bin zhang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China

The coronavirus disease 2019(COVID-19)pandemic has greatly damaged human society,but the origins and early transmission patterns of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)pathogen remain unclear.Here,we reconstructed the transmission networks of SARS-CoV-2 during the first three and six months since its first report based on ancestor-offspring relationships using BANAL-52-referenced mutations.We explored the position(i.e.,root,middle,or tip)of early detected samples in the evolutionary tree of SARS-CoV-2.In total,6799 transmission chains and 1766 transmission networks were reconstructed,with chain lengths ranging from 1-9 nodes.The root node samples of the 1766 transmission networks were from 58 countries or regions and showed no common ancestor,indicating the occurrence of many independent or parallel transmissions of SARS-CoV-2 when first detected(i.e.,all samples were located at the tip position of the evolutionary tree).No root node sample was found in any sample(n=31,all from the Chinese mainland)collected in the first 15 days from 24 December 2019.Results using six-month data or RaTG13-referenced mutation data were similar.The reconstruction method was verified using a simulation approach.Our results suggest that SARS-CoV-2 may have already been spreading independently worldwide before the outbreak of COVID-19 in Wuhan,China.Thus,a comprehensive global survey of human and animal samples is essential to explore the origins of SARS-CoV-2 and its natural reservoirs and hosts.

关键词： SARS-CoV-2 Transmission chain Transmission network Ancestor-offspring relationship De novo mutation Back mutation Secondary mutation

Simultaneously improving mechanical and anti-corrosion properties of extruded Mg-Al dilute alloy via trace Er addition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第19期150卷 49-64页

作者： zhi Zhang Jinshu Xie Jinghuai zhang Hao Dong Shujuan Liu Xiaobo zhang Jun Wang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China Ningbo Branch Ordnance Science Institute of ChinaNingbo 315103China

Simultaneously improving the mechanical properties and corrosion resistance of magnesium(Mg)alloys is a long-standing challenge to be solved in their engineering applications.In this work,we find that trace Er addition can improve the mechanical and anti-corrosion properties of Mg-1.4Al-0.4Mn-0.4Ca-0.3Er(wt%,AMXE)dilute alloy synergistically,especially reducing the corrosion rate(0.75 mm y-1)by one order of magnitude compared with the reference Mg-1.4Al-0.4Mn-0.4Ca(AMX)alloy and making it comparable to that of high-purity Mg.Adding trace Er reduces the dynamic recrystallization degree and increases the strengthening phase particles,which is mainly responsible for the increase of yield strength by 42 MPa.The addition of Er promotes the formation of much less noble Al8Mn4Er with effective Fe trapping ability and induces dislocation segregation,thus dramatically reducing micro-galvanic corrosion tendency.Meanwhile,Er addition promotes the formation of a more passivation and dense corrosion film.These two factors together lead to the extremely low corrosion rate of AMXE alloy.Our findings are expected to promote the development of low alloyed high performance Mg alloys.

关键词： Magnesium alloy Mechanics-corrosion synergy Rare earth element SKPFM

Age-specific mortality and fecundity of a spider mite under diet restriction and delayed mating

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

Insect Science 2022年第3期29卷 889-899页

作者： Guang-Yun Li zhi-Qiang zhang Centre for Biodiversity and Biosecurity School of Biological SciencesUniversity of AucklandAucklandNew Zealand Manaaki Whenua-Landcare Research AucklandNew Zealand Key Laboratory of Entomology and Pest Control Engineering College of Plant ProtectionSouthwest UniversityChongqingChina

Numerous experimental life-history studies on aging are mainly baised on two classical models—fruit fly Drosophila melanogaster(Meigen)and nematode Caenorhab-ditis elegans(Maupas)—with relatively little attention given to other organisms with different life-history characters.Two-spotted spider mite Tetranychus urticae Koch(Acari:Tetranychidae)differs from many other arthropods in that the females continue their growth in the early adult stage and can reproduce sexually and asexually.In this study,the influences of dietary restriction and delayed mating on the aging patterns of the spider mite were examined with the prevailing survival and reproduction trade-off hypothesis of aging being tested.Significant sex-specific responses of the spider mites were found.The females showed longevity extension on diet restriction(fasting for 2 days in every 4 days)compared with their counterparts being fed ad libitum,and after delayed mating for 9 days,while the males displayed a decrease in lifespan when experiencing diet restriction but were not significantly influenced by delayed mating.Path analysis was used to investigate the relationship between mite survival and reproduction traits,including longevity,female lifetime reproduction,age at first reproduction,early reproductive efforts and late reproductive efforts,yielding no evidence for trade-offs between these life-history traits.The additive effects of dietary restriction and delayed mating in lifespan extension of female spider mites were confirmed,proving that diet restriction is a robust anti-aging intervention,and that later onset of reproduction can prolong adult lifespan in females.

关键词： age-specific mortality delayed mating diet restriction reproduction sex difference trade-off

Accelerating the HS-type Richardson Iteration Method with Anderson Mixing

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

Acta Mathematica Sinica,English Series 2022年第11期38卷 2069-2089页

作者： zhi zhi LI Huai zhang Le OU-YANG Key Laboratory of Computational Geodynamics University of Chinese Academy of SciencesBeijing 100049P.R.China Guangdong Key Laboratory of Intelligent Information Processing Shenzhen Key Laboratory of Media Securityand Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)College of Electronics and Information EngineeringShenzhen UniversityShenzhen 518060P.R.China

The Accelerated Hermitian/skew-Hermitian type Richardson(AHSR)iteration methods are presented for solving non-Hermitian positive definite linear systems with three schemes,by using Anderson mixing.The upper bounds of spectral radii of iteration matrices are studied,and then the convergence theories of the AHSR iteration methods are established.Furthermore,the optimal iteration parameters are provided,which can be computed exactly.In addition,the application to the model convection-diffusion equation is depicted and numerical experiments are conducted to exhibit the effectiveness and confirm the theoretical analysis of the AHSR iteration methods.

关键词： Anderson mixing Hermitian/skew-Hermitian splitting the Richardson iteration convergence analyses optimal parameters the model convection-diffusion equation