检索结果-南通市图书馆

Influence of electron density,temperature and decay energy onβ^(-)decay rates in a stellar environment

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第5期46卷 159-164页

作者： shuo liu Chang Xu School of Physics Nanjing UniversityNanjing 210093China

In this paper,the β^(−)decay rates in the magnetic field of a neutron star are investigated under different conditions of electron density,temperature,and decay *** considering the influence of magnetic field on the electron spectrum,we improve the Takahashi-Yokoi model and perform the calculations of β^(−)decay rates for the nickel(Ni)isotopes,which are the typical neutron-rich nuclei participating in the rapid neutron-capture process(r-process).It is found that the β^(−)decay rates are increased significantly in the extremely strong magnetic field(B>10^(15)G).Furthermore,we find oscillation of β^(−)decay rates with the increase of magnetic field strength,implying that the magnitude of β^(−)decay rates is closely related to not only the decay energy but also the environmental electron *** contrast,the impact of temperature on the β^(−)decay rates is found to be negligible in the range of 10^(7)K

关键词： beta decay neutron star magnetic field

Synthesis and Growth Mechanism of Carbon Filaments by Chemical Vapor Deposition without Catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2009年第2期25卷 259-263页

作者： Shuhe liu Feng Li shuo Bai Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Carbon filaments with diameter from several to hundreds deposition of methane without catalyst. The morphology micrometers were synthesized by chemical vapor microstructure and mechanical properties of the carbon filament were investigated by scanning electronic microscopy, optical microscopy, X-ray diffraction and mechanical testing. The results show that the carbon filament is inverted cone shape and grows up along the gas flow direction. The stem of it is formed of annular carbon layers arranged in a tree ring structure while the head is made up of concentrical layers. The tensile strength of the carbon filament is increased after graphitization for the restructuring and growing large of graphene. The growth mechanism of carbon filament was proposed according to the results of two series of experiments with different deposition time and intermittent deposition cycles.

关键词： Carbon filaments Pyrolytic carbon Synthesis Chemical vapor deposition Mechanical property

Robust Assignment of Airport Gates with Operational Safety Constraints

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2016年第1期13卷 31-41页

作者： shuo liu Wen-Hua Chen Jiyin liu Department of Aeronautical and Automotive Engineering Loughborough University School of Business and Economics Loughborough University

This paper reviews existing approaches to the airport gate assignment problem （AGAP） and presents an optimization model for the problem considering operational safety constraints. The main objective is to minimize the dispersion of gate idle time periods （to get robust optimization） while ensuring appropriate matching between the size of each aircraft and its assigned gate type and avoiding the potential hazard caused by gate apron operational conflict. Genetic algorithm is adopted to solve the problem, An illustrative example is given to show the effectiveness and efficiency of the algorithm. The algorithm performance is further demonstrated using data of a terminal from Beijing Capital International Airport （PEK）.

关键词： Gate assignment problem operational safety constraints robust optimization conflict avoidance genetic algorithm.

Rational design strategies of Cu-based electrocatalysts for CO_(2) electroreduction to C_(2) products

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第8期31卷 63-82,I0003页

作者： shuo liu Baoshan Zhang Lihong Zhang Jie Sun Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Electrochemical reduction of CO_(2)(CO_(2)RR)to high value-added chemicals is an effective way to remove excess CO_(2) from the *** to the unique propensity of Cu for valuable hydrocarbons,Cu-based electrocatalysts are the most potential catalysts that allow the conversion of CO_(2) into a variety of C_(2) products such as ethylene and *** design of Cu-based catalysts can improve their directional selectivity to C_(2) ***,in this review,we summarize the recent progress in the mechanistic studies of Cu-based catalysts on reducing CO_(2) to C_(2) *** focus on three key strategies for efficiently enhancing electrocatalytic performance of Cu-based catalysts,including tuning electronic structure,surface structure,and coordination *** correlation between the structural characteristics of Cu-based catalysts and their activity and selectivity to C_(2) products is ***,we discuss the challenges in the field of CO_(2) electroreduction to C_(2) products and provide the perspectives to design efficient Cu-based catalysts in the future.

关键词： Carbon dioxide Cu-based catalysts Mechanisms Active site regulation

Robust adaptive passification and global stabilisation for uncertain switched nonlinear systems

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2019年第2期6卷 75-89页

作者： shuo liu Hongbo Pang College of Science Liaoning University of TechnologyJinzhouChina

In this paper,we focus on the problems of feedback passification and global stabilisation for a class of uncertain switched non-linear systems with parameter uncertainties and structural uncertainties.A state-dependent switching law and adaptive feedback controllers are designed to render the resulting closed-loop systems *** corresponding passivity-based adaptive stabilisation problems for these systems are ***,a numerical example is presented to illustrate the effectiveness of our method.

关键词： Switched non-linear systems robust adaptive passification global stabilisation

Amoeba-inspired magnetic microgel assembly assisted by engineered dextran-binding protein for vaccination against lifethreatening systemic infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 938-950页

作者： shuo liu Yan Zhao Linpei Guo Qilin Yu Key Laboratory of Molecular Microbiology and Technology Ministry of EducationDepartment of MicrobiologyCollege of Life SciencesNankai UniversityTianjin 300071China Research Center for Infectious Diseases Nankai UniversityTianjin 300350China College of Environmental Science and Engineering Tianjin Key Laboratory of Environmental Remediation and Pollution ControlNankai UniversityTianjin 300350China Department of Urology The Affiliated Wuxi No.2 People’s Hospital of Nanjing Medical UniversityWuxi 214002China

Vaccination is critical for population protection from pathogenic ***,its efficiency is frequently compromised by a failure of antigen retention and ***,we designed a dextran-binding protein DexBP,which is composed of the carbohydrate-binding domains of Trichoderma reesei cellobiohydrolases Cel6A and Cel7A,together with the sequence of the fluorescent protein *** was further prepared by engineered Escherichia coli cells and grafted to magnetic *** magnetic nanoparticles were integrated with a dextran/poly(vinyl alcohol)framework and a reactive oxygen species-responsive linker,obtaining magnetic polymeric microgels for carrying pathogen *** to amoeba aggregation,the microgels self-assembled to form aggregates and further induced dendritic cell *** step-by-step assembly retained antigens at lymph nodes,promoted antigen presentation,stimulated humoral immunity,and protected the mice from lifethreatening systemic *** study developed a magnetic microgel-assembling platform for dynamically regulating immune response during protection of the body from dangerous infections.

关键词： magnetic nanoparticle engineered protein dextran microgel vaccination systemic infection

An integer programming formulation and iterative scheme algorithm for the block relocation problem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Control and Decision 2023年第3期10卷 338-347页

作者： shuo liu Shixin liu Chao Lu College of Information Science and Engineering Northeastern UniversityShenyangPeople’s Republic of China

In this paper, we deal with the unrestricted block relocation problem. We present a new integerprogramming formulation for solving the problem. The initial formulation is improved by tighteningconstraints and a pre-processing step to fix several variables. We design a exact iterativescheme algorithm based on a fast heuristic for the integer programming formulation (ISA-FH).Computational results show the effectiveness of the improved formulation and algorithm.

关键词： Block relocation problem integer programming iterative scheme algorithm

Programmable and Reversible Regulation of Catalytic Hemin@MOFs Activities with DNA Structures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第2期36卷 301-306页

作者： liu shuo YANG Mingjie GUO Weiwei College of Chemistry Research Centre for Analytical SciencesTianjin Key Laboratory of Biosensing and Molecular RecognitionNankai UniversityTianjin 300071R R.China

Metal-organic frameworks(MOFs)-based nanozyme plays an important role in biosensing,therapy and *** this study,the effects of single-stranded DNA(ssDNA)with programmable sequences and its complementary DNA(Tdna)on the intrinsic peroxidase-like activity of hemin loaded MOFs(UiO-66-NH2),denoted as he-min@UiO-66-NH2,were *** hemin@UiO-66-NH2 exhibited improved catalytic activity compared with free ***,the catalytic activity is inhibited in the presence of ssDNA,as ssDNA can be adsorbed by MOFs and therefore protected the active sites from contact with *** the addition of the TDNA,double-stranded DNA(dsDNA)was formed and detached from the MOFs,resulting in the recovery of catalytic *** adding ssDNA or its complementary DNA strands can achieve the reversible regulation of the catalytic activity of MOFs ***,the DNA hybridization-based regulation was further applied to a cascaded catalytic system composed of the nanozyme,hemin@UiO-66-NH2,and glucose *** nanozyme based programmable and reversibly regulated catalytic systems may have potential applications in future smart biosensing and catalysis systems.

关键词： Nanozyme Catalytic metal-organic framework Hemin DNA hybridization Dynamic modification

A Novel Salient Region Detection Method Based on Hierarchical Spatial Information

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2017年第2期26卷 319-324页

作者： liu shuo DING Wenrui LI Hongguang LI Yingting School of Electronic and Information Engineering Beihang University Research Institute of Unmanned Aerial Vehicle Beihang University

Different patterns in one object will cause unequal saliency degree which makes it hard to highlight the object region *** propose a salient region detection method which mainly includes image abstraction,saliency calculation and *** the detection framework,the hierarchical spatial information is introduced to improve the *** image abstraction with "pixel level" spatial information is applied to capture some meaningful *** local contrast is calculated with the "element level" spatial ***"object level" spatial information is represented as compactness and background possibility,which further help to better pop out the object region and suppress the *** results show that our method has a good performance even though the object consists of complex patterns.

关键词： Salient region detection Hierarchical spatial information Compactness Background possibility