检索结果-南通市图书馆

Journal of Materials Science & Technology 2013年第9期29卷 855-862页

作者： Hongjie Jiang shanshan cao Changbo Ke Xiao Ma Xinping Zhang School of Materials Science and Engineering South China University of Technology

A near-equiatomic NiTi shape memory alloy was fabricated by rapid solidification process through vacuum arc melting followed by vacuum suction casting in water-cooled thick copper mold. The rapidly solidified （or suction cast） NiTi alloy shows much finer grains and homogenous microstructure, in particular a uniform distribution of various fine precipitates, compared to the conventional cast one. The resultant alloy also exhibits the homogenous Ni distribution in the matrix of the alloy, allowing the martensitic transformation to take place throughout the NiTi alloy matrix simultaneously and resulting in sharper transformation peaks compared to the conventional cast alloy. Moreover, the suction cast NiTJ alloy shows a significant improvement over the conventional cast one, in terms of possessing higher deformation recovery rates and displaying the increased compressive strength and damping capacity by 4% and 20%, respectively.

关键词： NiTi shape memory alloy Rapid solidification Mierostructure Mechanical property Damping performance

Spatial Differentiation and Convergence Trend of High-quality Development Level of China’s Tourism Economy

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2024年第2期34卷 230-249页

作者： cao shanshan HE Zhaoli NIU Jinlan WANG Songmao ZHAO Lei School of Geography and Ocean Science Nanjing UniversityNanjing 210046China School of Business Administration Nanjing University of Finance and EconomicsNanjing 210046China School of Economics and Management Shandong Agricultural Uni-versityTai’an 271018China School of Hotel Management Shanghai Business SchoolShanghai 201400China School of Man-agement Zhejiang University of TechnologyHangzhou 310014China

This paper aims to interpret the connotation of high-quality development of tourism economy(HQTE)from the perspective of the new development concepts of innovation,coordination,green,openness and sharing,and then to evaluate the spatial differenti-ation of China’s HQTE based on provincial panel data from 2009 to ***,we employ the spatial convergence model to ex-plore the absolute and conditionalβconvergence trends of HQTE in the whole country and the eastern,central and western regions of *** empirical results reveal that:1)within the decade,from 2009 to 2018,regions of China with the highest HQTE index is its eastern region followed by the central region and then the western region,but the fastest growing one is the western region of China fol-lowed by the central region and then the eastern region.2)Whether or not the spatial effect is included,there are absolute and condition-alβconvergence in HQTE in the whole country and aforementioned three regions.3)The degree of government attention as well as the level of economic development and location accessibility are the positive driving factors for the convergence of HQTE in the whole country and the three *** degree of marketization and human capital have not passed the significance test either in the whole country or in the three *** above conclusions could deepen the understanding of the regional imbalance and spatial conver-gence characteristics of HQTE,clarify the primary development objects,and accomplish the goal of China’s HQTE.

关键词： new development concepts high-quality development of tourism economy(HQTE) spatial convergence China

Impacts of agri-food e-commerce on traditional wholesale industry:Evidence from China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第4期23卷 1409-1428页

作者： Ruyi Yang Jifang Liu shanshan cao Wei Sun Fantao Kong Institute of Agricultural Information Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Special Animal and Plant Sciences Chinese Academy of Agricultural SciencesChangchun 130112China

Rapidly expanding studies investigate the effects of e-commerce on company operations in the retail ***,the interaction between agri-food e-commerce(AEC)and the traditional agri-food wholesale industry(AWI)has not received enough attention in the existing *** on the provincial panel data from 2013 to 2020 in China,this paper examines the effect of AEC on AWI,comprising three dimensions:digitalization(DIGITAL),agrifood e-commerce infrastructure and supporting services(AECI),and agri-food e-commerce economy(AECE).First,AWI and AEC are measured using an entropy-based combination of *** results indicate that for China as a whole,AWI has remained practically unchanged,whereas AEC exhibits a significant rising ***,the findings of the fixed-effect regression reveal that DIGITAL and AECE tend to raise AWI,whereas AECI negatively affects ***,threshold regression results indicate that AECI tends to diminish AWI with three-stage inhibitory intensity,which manifests as a first increase and then a drop in the inhibition *** results suggest that with the introduction of e-commerce for agricultural product circulation,digital development will have catfish effects that tend to stimulate the vitality of the conventional wholesale industry and promote technical ***,the traditional wholesale industry benefits financially from e-commerce even while it diverts part of the traditional wholesale circulation for agricultural products.

关键词： agri-food e-commerce traditional wholesale industry panel threshold model dual-channel circulation

Simulation of Fatigue Stiffness Degradation in Prestressed Concrete Beams under Cyclic Loading

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2016年第1期23卷 67-74页

作者： Junqing Lei shanshan cao Guoshan Xu Yun Xiao School of Civil Engineering Beijing Jiaotong University School of Civil Engineering Harbin Institute of Technology

In order to investigate and research the fatigue cracking of prestressed concrete fatigue properties and loading and stiffness degeneration process,cyclic loading tests were carried out on six prestressed concrete beams and the stiffness degradation under fatigue was investigated. A simulation model of stiffness degradation is proposed based on the stiffness analysis of the fatigue-damaged section. The elastic modulus of damaged concrete and the effective residual area of steel were introduced as well as an adjusted three-stage concrete fatigue damage evolution model. The strip method was used to analyze concrete damage due to changing stress along the depth of the beam section. The simulation and test results were compared and a method of predicting fatigue deflection was presented based on the simulation model. The predicted results were compared with that of the neural network method. It is in good agreement for the simulation results with the test results. It is only less than5% error for the simulation model which can reveal the two-stage degradation of prestressed concrete beams under cyclic loading. It is more precise for the simulation prediction method under proper conditions.

关键词： prestressed concrete beam fatigue stiffness degradation simulation damaged concrete elastic modulus steel effective residual area deflection prediction

Critical Opalescence and Its Impact on the Jet Quenching Parameter q

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2024年第3期41卷 23-29页

作者：武警曹杉杉李峰 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CASLanzhou 730000China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China

Jet quenching parameter q is essential for characterizing the interaction strength between jet partons and nuclear *** on the quark-meson model,we develop a new framework for calculating q at finite chemical potential... 详细信息

关键词： parameter quark calculating

Quenching and flow of charm and bottom quarks via semi-leptonic decay of D and B mesons in Pb+Pb collisions at the LHC

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第8期48卷 190-197页

作者： Shu-Qing Li Wen-Jing Xing shanshan cao Guang-You Qin School of Physics and Electronic Engineering Jining UniversityQufu 273155China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China

Heavy flavor particles provide important probes of the microscopic structure and thermodynamic properties of the quark-gluon plasma(QGP)produced in high-energy nucleus-nucleus *** studied the energy loss and flow of charm and bottom quarks inside the QGP via the nuclear modification factor(R_(AA))and elliptic flow coefficient(v_(2))of their decayed leptons in heavy-ion collisions at the *** dynamical evolution of the QGP was performed using the CLVisc(3+1)-dimensional viscous hydrodynamics model;the evolution of heavy quarks inside the QGP was simulated with our improved Langevin model that considers both collisional and radiative energy loss of heavy quarks;the hadronization of heavy quarks was simulated via our hybrid coalescence-fragmentation model;and the semi-leptonic decay of D and B mesons was simulated via *** the same spatial diffusion coefficient for charm and bottom quarks,we obtained smaller R_(AA) and larger v_(2) of charm decayed leptons than bottom decayed leptons,indicating stronger energy loss of charm quarks than bottom quarks inside the QGP within our current model setup.

关键词： quark-gluon plasma heavy-ion collisions jet quenching anisotropic flow heavy quark heavy flavor muon

Understanding the spatial representativeness of air quality monitoring network and its application to PM_(2.5)in the China's Mainland

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2022年第3期13卷 130-138页

作者： Ling Su Chanchan Gao Xiaoli Ren Fengying Zhang shanshan cao Shiqing Zhang Tida Chen Mengqing Liu Bingchuan Ni Min Liu Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China China National Environmental Monitoring Centre Beijing 100012China Institute of Eco-Chongming Shanghai 200241China

Air pollution has seriously endangered human health and the natural ecosystem during the last *** quality monitoring stations(AQMS)have played a critical role in providing valuable data sets for recording regional air *** spatial representativeness of AQMS is a critical parameter when choosing the location of stations and assessing effects on the population to long-term exposure to air *** this paper,we proposed a methodological framework for assessing the spatial representativeness of the regional air quality monitoring network and applied it to ground-based PM_(2.5)observation in the mainland of *** multidimensional Euclidean distance between each pixel and the stations was used to determine the representativeness of the existing monitoring *** addition,the K-means clustering method was adopted to improve the spatial representativeness of the existing *** results showed that there were obvious differences among the representative area of 1820 stations in the mainland of *** monitoring stations could well represent the PM_(2.5)spatial distribution of the entire region,and the effectively represented area(*** area where the Euclidean distance between the pixels and the stations was lower than the average value)accounted for 67.32%of the total area and covered 93.12%of the *** additional stations were identified in the Northwest,North China,and Northeast regions,which could improve the spatial representativeness by 14.31%.

关键词： PM_(2.5) Euclidean distance Spatial representativeness China

Kilometers Long Graphene-Coated Optical Fibers for Fast Thermal Sensing

在线全文

学校读者我要写书评

暂无评论

Research 2021年第1期2021卷 286-294页

作者： Yiyong Guo Bing Han Junting Du shanshan cao Hua Gao Ning An Yiwei Li Shujie An Zengling Ran Yue Lin Wencai Ren Yunjiang Rao Baicheng Yao Key Laboratory of Optical Fiber Sensing and Communications(Education Ministry of China) University of Electronic Science and Technology of ChinaChengdu 611731China Research Centre of Optical Fiber Sensing Zhejiang LaboratoryHangzhou 310000China Optical Fiber Co. Ltd.ZTT GroupNantong 226009China Carbonene Technology Co. LtdDeyang 618000China Optical Science and Technology Ltd. China National Petroleum CorporationChengdu 610041China Cavendish Laboratory University of CambridgeCB30HEUK Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The combination of optical fiber with graphene has greatly expanded the application regimes of fiber optics,from dynamic optical control and ultrafast pulse generation to high precision ***,limited by fabrication,previous graphene-fiber samples are typically limited in the micrometer to centimeter scale,which cannot take the inherent advantage of optical fibers—longdistance optical ***,we demonstrate kilometers long graphene-coated optical fiber(GCF)based on industrial graphene nanosheets and coating *** GCF shows unusually high thermal diffusivity of 24.99 mm^(2) s^(-1) in the axial direction,measured by a thermal imager *** enables rapid thermooptical response both in optical fiber Bragg grating sensors at one point(18-fold faster than conventional fiber)and in long-distance distributed fiber sensing systems based on backward Rayleigh scattering in optical fiber(15-fold faster than conventional fiber).This work realizes the industrial-level graphene-fiber production and provides a novel platform for two-dimensional material-based optical fiber sensing applications.

关键词： fiber scattering faster

Heavy flavor quenching and flow:the roles of initial condition,pre-equilibrium evolution,and in-medium interaction

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

Chinese Physics C 2020年第11期44卷 127-137页

作者： Shu-Qing Li Wen-Jing Xing Feng-Lei Liu shanshan cao Guang-You Qin Department of Physics and Information Engineering Jining UniversityQufu 273155China Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Cyclotron Institute Texas A&M UniversityCollege StationTexas77843USA Department of Physics and Astronomy Wayne State UniversityDetroitMichigan 48201USA Nuclear Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Within an advanced Langevin-hydrodynamics framework coupled to a hybrid fragmentation-coalescence hadronization model,we study heavy flavor quenching and flow in relativistic heavy-ion *** investigate how the initial heavy quark spectrum,the in-medium energy loss and hadronization mechanisms of heavy quarks,the evolution profile of the pre-equilibrium stage,the medium flow,and the temperature dependence of heavy quark diffusion coefficients influence the suppression and elliptic flow of heavy mesons at the RHIC and the *** results show that the different modeling of initial conditions,pre-equilibrium evolution,and in-medium interactions can individually yield uncertainties of approximately 10-40% in D meson suppression and flow at a low transverse *** also find that proper combinations of collisional versus radiative energy loss,coalescence versus fragmentation in hadronization,and the inclusion of medium flow are the most important factors for describing the suppression and elliptic flow of heavy mesons.

关键词： quark-gluon plasma heavy-ion collisions jet quenching heavy quark

Effects of the formation time of parton shower on jet quenching in heavy-ion collisions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2023年第2期47卷 157-164页

作者：张梦雪何杨曹杉杉易立 Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China

Jet quenching has successfully served as a hard probe to study the properties of Quark-Gluon Plasma(QGP).As a multi-particle system,jets require time to develop from a highly virtual parton to a group of partons close to mass *** this study,we present a systematical analysis on the effects of this formation time on jet quenching in relativistic nuclear *** from initial hard scatterings were simulated with Pythia,and their interactions with QGP were described using a Linear Boltzmann Transport(LBT) model that incorporates both elastic and inelastic scatterings between jet partons and the thermal *** different estimations of the jet formation time were implemented and compared,including instantaneous formation,formation from single splitting,and formation from sequential splittings,before which no jet-medium interaction was *** found that deferring the jet-medium interaction with a longer formation time not only affects the overall magnitude of the nuclear modification factor of jets but also its dependence on the jet transverse momentum.

关键词： relativistic heavy-ion collisions quark-gluon plasma jet quenching formation time