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创新资本要素流动对城市经济韧性的影响研究

生产力研究 2024年第3期 116-122页

作者：沈文青王子敏南京邮电大学经济学院江苏南京210023

利用2006—2019年中国276个地级市的面板数据,考察了创新资本要素流动对城市经济韧性的影响,并进一步研究了国家创新型城市试点政策所发挥的调节作用。结果显示:创新资本要素流动能够显著提升城市经济韧性及其抵抗风险能力和创新转型能... 详细信息

利用2006—2019年中国276个地级市的面板数据,考察了创新资本要素流动对城市经济韧性的影响,并进一步研究了国家创新型城市试点政策所发挥的调节作用。结果显示:创新资本要素流动能够显著提升城市经济韧性及其抵抗风险能力和创新转型能力,对其适应调整能力无显著作用;异质性研究发现,创新资本流入导致了“趋向创新”的韧性提升,而创新资本流出导致了“趋向保守”的韧性提升;进一步研究发现,推广国家创新型城市试点政策在创新资本要素流动对城市经济韧性的影响中发挥了积极作用,甚至创新资本要素与国家创新型城市试点政策的交互作用显著提升了城市经济韧性的适应调整能力,而这种作用单独依靠创新资本要素的流动是发挥不出来的。

关键词：创新资本要素流动城市经济韧性创新型城市

Neutron Halos in the Excited States of Spherical Nuclei Near the β-Stable Line

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Communications in Theoretical Physics 2002年第10期38卷 470-474页

作者： REN Zhong-Zhou JIANG Wei-Zhou CAI Xiang-Zhou ZHU Zhi-Yuan shen wen-qing Department of Physics Nanjing University Nanjing 210093 China Shanghai Institute of Nuclear Research the Chinese Academy of Sciences Shanghai 201800 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Shanghai Institute of Nuclear Research the Chinese Academy of Sciences Shanghai 201800 China Shanghai Institute of Nuclear Research the Chinese Academy of Sciences Shanghai 201800 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Shanghai Institute of Nuclear Research the Chinese Academy of Sciences Shanghai 201800 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

The newly discovered neutron halos in the excited states of nuclei 12B, 13C, and 209pb are studied by therelativistic mean-field theory. The calculated binding energies are very close to the experimental ones. The experimentally extracted root-mean-square radii of the last neutron with different occupations in nuclei are well reproduced bycalculations. New candidates for the neutron halos in excited states are predicted and are useful for further search ofneutron halos in the excited states of stable nuclei.

关键词： neutron halo, excited states, relativistic mean-field theory

Isospin Effects of Critical Behavior in Lattice Gas Model

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Chinese Physics Letters 1999年第4期16卷 256-258页

作者： MA Yu-gang SU Qian-min shen wen-qing WANG Jian-song CAI Xiang-zhou FANG De-qing Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Fudan-T.D.Lee Physics Laboratory Fudan UniversityShanghai 200433 CCAST(World Laboratory) P.O.Box 8730Beijing 100080

Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas *** the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39ρ*** critical values of power law parameter of mass distribution,mean multiplicity of intermediate mass fragments,information entropy and Campi's second moment show minor dependence on the isospin at the critical point.

关键词： point critical entropy

An Innovative Coupled Common-Node Discrete Element Method-Smoothed Particle Hydrodynamics Model Developed with LS-DYNA and Its Applications

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China Ocean Engineering 2024年第3期38卷 467-482页

作者： shen Zhong-xiang WANG wen-qing XU Cheng-yue LUO Jia-xin LIU Ren-wei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

In this study,a common-node DEM-SPH coupling model based on the shared node method is proposed,and a fluid–structure coupling method using the common-node discrete element method-smoothed particle hydrodynamics(DS-SPH)method is developed using LS-DYNA *** DEM and SPH are established on the same node to create common-node DEM-SPH particles,allowing for fluid–structure *** simulations of various scenarios,including water entry of a rigid sphere,dam-break propagation over wet beds,impact on an ice plate floating on water and ice accumulation on offshore structures,are *** interaction between DS particles and SPH fluid and the crack generation mechanism and expansion characteristics of the ice plate under the interaction of structure and fluid are also *** results are compared with available data to verify the proposed coupling ***,the simulation results demonstrated that controlling the cutoff pressure of internal SPH particles could effectively control particle splashing during ice crushing failure.

关键词： common-node DEM-SPH fluid-structure interaction discrete element method smoothed particle hydrodynamics

Study of Giant Dipole Resonance of Super Heavy Compound System

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Chinese Physics Letters 1998年第9期15卷 642-644页

作者： CAI Yan-huang WANG Jian-song shen wen-qing MA Yu-gang FENG Jun YE Wei CAI Xiang-zhou FANG De-qing CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Institute of Nuclear Research Chinese Academy of ScienceShanghai 201800 Fudan-T.D.Lee Physics Laboratory Fudan UniversityShanghai 200433

A microscopic semi-classical approach,i.e.,the linearized Vlasov equation with a collision term treated by the relaxation time approximation,is simply described and is used to investigate the giant dipole resonance(GDR)from hot super heavy compound *** possibility of such GDRγrays emission is described also according to the fission *** Au+Au system(A=392)and Xe+U system(A=374),the temperature dependence of strength distribution of GDRγrays and the deformation effect on GDRγrays are discussed in framework of this approach.

关键词： system relaxation linearized

On the half-quantized Hall conductance of massive surface electrons in magnetic topological insulator films

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 127-136页

作者： Rui Chen Shun-qing shen Department of Physics The University of Hong KongHong Kong 999077China Department of Physics Hubei UniversityWuhan 430062China

In topological insulators,massive surface states resulting from local symmetry breaking were thought to exhibit a half-quantized Hall conductance,obtained from the low-energy effective model in an infinite Brillouin *** a lattice model,the surface band is composed of a combination of surface states and bulk *** massive surface states alone may not be enough to support an exact one-half quantized surface Hall conductance in a finite Brillouin zone and the whole surface band always gives an integer quantized Hall conductance as enforced by the TKNN *** explore this,we investigate the band structures of a lattice model describing the magnetic topological insulator film that supports the axion insulator,Chern insulator,and semi-magnetic topological insulator *** reveal that the gapped and gapless surface bands in the three phases are characterized by an integer-quantized Hall conductance and a half-quantized Hall conductance,*** propose an effective model to describe the three phases and show that the low-energy dispersion of the surface bands inherits from the surface Dirac *** gapped surface band manifests a nearly half-quantized Hall conductance at low energy near the center of Brillouin zone,but is compensated by another nearly half-quantized Hall conductance at high energy near the boundary of Brillouin zone because a single band can only have an integer-quantized Hall *** gapless band hosts a zero Hall conductance at low energy but is compensated by another half-quantized Hall conductance at high energy,and thus the half-quantized Hall conductance can only originate from the gapless ***,we calculate the layer-resolved Hall conductance of the *** conclusion suggests that the individual gapped surface band alone does not support the half-quantized surface Hall effect in a lattice model.

关键词： magnetic topological insulator Dirac equation half-quantized Hall conductance

Probability-consistent earthquakes and probability-consistent conservative earthquakes

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 56-63页

作者： JIAN wen shen CHANG qing CAI Shanghai Seismological Bureau, Shanghai 200062, China 1. Shanghai Seismological Bureau 200062 Shanghai China

It is pointed out in this paper that the concept of scenario earthquake, expectant earthquake or proposed earthquake suggested by Kameda Nojima (1988) is not probability consistent due to unfit understanding for the aseismic design standard of probabilistic method. The corresponding concept proposed by QI FENG LUO meets the meaning of probability consistent, but it is still in a meaning of average so the result is not good enough. On the basis of above analysis, a concept of probability consistent conservative earthquakes is suggested. And a new method selecting aseismic objective earthquake with physical meaning is proposed on the basis of probabilistic method. After seismic hazard is analysed by certain control parameters, such as peak acceleration, we can determine the aseismic standard according to certain probabilistic level. Based on the attenuation law and the potential sources, we can find out some earthquakes or their combinations of magnitudes and distances. Such earthquakes or combinations are probability consistent for this control parameter. Based on above parameter, we suggest considering the destructive effects of other parameters (such as response spectrum), and selecting conservative earthquakes to replace the average earthquake and meet the requirements of aseismic design better.

关键词： seismic hazard analysis probability consistent scenario earthquakes expectant earthquakes

Directed and Elliptic Flows in ^(112)Sn+^(112)Sn Collisions

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Chinese Physics Letters 2001年第6期18卷 756-758页

作者： ZHANG Hu-Yong MA Yu-Gang YU Li-Ping shen wen-qing CAI Xiang-Zhou FANG De-qing ZHONG Chen HAN Ding-Ding Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Department of Physics Ningbo UniversityNingbo 315211 Department of Electronic Engineering East China Normal UniversityShanghai 200062

The directed and elliptic flow in collisions of ^(112)Sn+^(112)Sn at energies from 35 to 90 MeV/nucleon are studied in an isospin-dependent quantum molecule dynamics *** increasing incident energy,the directed flow rises from negative to *** magnitude depends on the nuclear equation of state(EOS).However,the elliptic flow decreases with increasing incident energy and its magnitude is not very sensible to *** studies of the impact parameter dependence and the cluster mass dependence are also *** study of directed flow at intermediate energies thus provides a means of extracting the information on the nuclear equation of state.

关键词： state directed flow

Study on Excitation Function and Isospin Dependencies of Total Reaction Cross Section via the Boltzmann-Uehling-Uhlenbeck Model

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Chinese Physics Letters 2000年第8期17卷 565-567页

作者： CAI Xiang-Zhou shen wen-qing FENG Jun FANG De-qing MA Yu-Gang SU Qian-Min ZHANG Hu-Yong HU Peng-Yun Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 CCAST(WorId Laboratory) P.O.Box 8730Beijing 100080

The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density *** the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber *** systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation *** is also found thatσR is sensitive to nuclear equation of state andσin-NN *** difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.

关键词： BUU removed excitation