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Measurement of City Clusters' Economic Growth Effects and Analysis of the Influencing Factors

Chinese Journal of Urban and Environmental Studies 2020年第1期8卷 111-131页

作者： han jing GAO Ming SUN Yawen School of Economics and Resource Management Beijing Normal University

Based on the panel data of 202 prefecture-level cities within 14 national-level city clusters in China from 2007 to 2016, we established a dynamic panel model to measure the economic growth effects of city clusters and analyzed the main influencing factors. The results show that:(i) Technology has a significant impact on the economic growth of city clusters; the narrowing development gap between regions can help city clusters produce good economic growth effects;the city clusters, if more agglomerated, can help better utilize factors, and thus promote coordinated regional development.(ii) City clusters with multiple central cities boast a stronger engine of economic growth, and the impacts of factors such as technology and clustering degree on their economic growth are more noticeable.(iii) Geographical factors will also affect city clusters’ economic growth. The economic growth of city clusters in Southern China has been more strongly powered by the factors such as technology, clustering degree and human capital than those in Northern China. From the spatial perspective and by using the threshold panel method,we further explored the mechanisms with which the central cities within a city cluster can influence economic growth depending on their accessibility. The results manifest that the more accessible the central cities within a city cluster are, the stronger role they can play in leading and driving the economic growth of surrounding areas. In the future, it is important to promote the transformation of single-core and dual-core city clusters into multi-core city clusters, and give full play to the role of central cities in leading the development of surrounding areas. It is also necessary to vigorously develop technology and transportation to further facilitate the high-quality growth of city clusters.

关键词： City clusters economic growth effects influencing factors central cities’ accessibility

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The mechanism behind activation of the Nod-like receptor family protein 3 inflammasome in Parkinson's disease

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Neural Regeneration Research 2022年第4期17卷 898-904页

作者： jing Wang Xiao-Na Zhang Jin-Ni Fang Fei-Fei Hua jing-Yang han Zeng-Qiang Yuan An-Mu Xie Department of Neurology the Affiliated Hospital of Qingdao UniversityQingdaoShandong ProvinceChina Brain Science Center Academy of Military Medical Sciences of PLABeijingChina

Previous studies have shown that the ATP-P2 X4 receptor signaling pathway mediates the activation of the Nod-like receptor family protein 3(NLRP3)*** NLRP3 inflammasome may promote renal interstitial inflammation in diabetic *** inflammation also plays an important role in the pathogenesis of Parkinson's disease,we hypothesized that the ATP-P2 X4 receptor signaling pathway may activate the NLRP3 inflammasome in Parkinson's disease.A male rat model of Parkinson's disease was induced by stereotactic injection of 6-hydroxydopamine into the pars compacta of the substantia *** P2 X4 receptor and the NLRP3 inflammasome(interleukin-1βand interleukin-18)were *** injection of the selective P2 X4 receptor antagonist 5-(3-bromophenyl)-1,3-dihydro-2 H-benzofuro[3,2-e]-1,4-diazepin-2-one(5-BDBD)or knockdown of P2 X4 receptor expression by si RNA inhibited the activation of the NLRP3 inflammasome and alleviated dopaminergic neurodegeneration and *** results suggest that the ATP-P2 X4 receptor signaling pathway mediates NLRP3 inflammasome activation,dopaminergic neurodegeneration,and dopamine *** findings reveal a novel role of the ATP-P2 X4 axis in the molecular mechanisms underlying Parkinson's disease,thus providing a new target for *** study was approved by the Animal Ethics Committee of Qingdao University,China,on March 5,2015(approval *** 26119).

关键词： ATP neurodegenerative disorder neuroinflammation neuroinflammatory response NLRP3 P2X4 Parkinson's disease

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Characteristics of the three-dimensional deep electrical structure in the Helan Mountains-Yinchuan Basin and its geodynamic implications

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Science China Earth Sciences 2023年第3期66卷 505-520页

作者： Lingqiang ZHAO Xiangyu SUN Yan Zhan jing han Haibo YANG Peijie WANG Xuehua LIU State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Lhasa National Geophysical Observation and Research Station Lhasa 850004China The Second Monitoring and Application Center China Earthquake AdministrationXi’an 710043China

Located in the north segment of the North-South seismic belt where the Alxa block(AB)and the Ordos block(OB)contact,the Helan Mountains-Yinchuan Basin(HLM-YCB)constitutes a typical normal faulting basin-mountain structure on the Chinese *** 1739 M8.0 Pingluo earthquake occurred in the Yinchuan fault depression basin with such a basinmountain *** on five magnetotelluric profiles encompassing distinct segments of the HLM-YCB were utilized for three-dimensional(3D)joint inversion in order to collect fine 3D electrical structure information at a crustal and upper mantle scale across the entire *** electrical structure between the main blocks in the HLM-YCB and adjacent areas is characterized by east-west horizontal blocks OB,YCB,and HLM,which are divided by the Yellow River fault(F5)with the HLM eastern piedmont fault(F2)as electrical boundary zones on the east and west *** two main block units,AB and OB,exhibit an obvious layered resistivity ***,the HLM-YCB is characterized by a typical basin-mountain structure with the mountains as a high-resistivity body and the basin as a low-resistivity body,and in the northern YCB a large-scale lowresistivity structure exists,extending to the upper mantle,probably derived from the upwelling of mantle-derived *** is speculated from a combination of recent 3D crustal movement field information and other data that the HLM-YCB is an active tectonic zone formed via regional tensile *** formation of the HLM-YCB lies in the interaction of the Tibetan Plateau(TP),AB,and OB and abnormal mantle activities beneath the *** HLM-YCB reflects the joint action of upwelling and diffluence caused by the underplating of hot materials from the deep mantle with gravity and the redistribution of regional tectonic stress on the earth’s surface,which may be the main dynamic reason for the 1739 M8.0 Pingluo earthquake.

关键词： Helan Mountains Yinchuan Basin Magnetotelluric 3D electrical structure The 1739 Pingluo earthquake

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PIV experiment and large eddy simulation of turbulence characteristics in a confined impinging jet reactor

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Chinese Journal of Chemical Engineering 2019年第1期27卷 10-20页

作者： Miao Liu Zhengming Gao Yongjiu Yu Zhipeng Li jing han Ziqi Cai Xiongbing Huang State Key Laboratory of Chemical Resource Engineering School of Chemical EngineeringBeijing University of Chemical Technology

Confined impinging jet reactor(CIJR) is a typical process intensification device used in the chemical *** this study, two dimensional Particle Image Velocimetry(PIV) and Large Eddy Simulation(LES) method were used to investigate the flow field in a CIJR with jets of diameter 3 mm under highly turbulent *** results showed LES can predict the velocity and Turbulence Kinetic Energy(TKE) distributions in the reactor well by comparing with the PIV *** the CIJR, the stagnation point fluctuates with the turbulence, and its instantaneous position accords with the normal *** methods, including s–t representation, Lumley–Newman triangle and A–G representation, were used to compare the turbulence anisotropy in the mixing *** was found that the anisotropy in the impinging area and at the edge of impinging jet was strong and the maximum deviation was up to 40%.The results from 2 DPIV would lead to an overestimation of the turbulent kinetic energy as much as 20% to 30% than the results from the three dimensional numerical simulation.

关键词： PIV LES Turbulent kinetic energy Pseudo-isotropic assumption

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Damage characteristics of laser plasma shock wave on rear surface of fused silica glass

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Chinese Physics B 2019年第8期28卷 225-231页

作者： Xiong Shen Guo-Ying Feng Sheng jing jing-Hua han Ya-Guo Li Kai Liu College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China Sichuan Earthquake Administration Chengdu 610041China Fine Optical Engineering Research Center Chengdu 610041China

The damage to the rear surface of fused silica under the action of high power laser is more severe than that incurred by the front surface,which hinders the improvement in the energy of the high power laser *** optical components,the ionization breakdown by laser is a main factor causing damage,particularly with laser plasma shock waves,which can cause large-scale fracture damage in fused *** this study,the damage morphology is experimentally investigated,and the characteristics of the damage point are *** the theoretical study,the coupling and transmission of the shock wave in glass are investigated based on the finite element ***,both the magnitude and the orientation of stress are *** damage mechanism of the glass can be explained based on the fracture characteristics of glass under different stresses and also on the variation of the damage zone’s Raman *** addition,the influence of the glass thickness on the damage morphology is *** results obtained in this study can be used as a reference in understanding the characteristics and mechanism of damage characteristics induced by laser plasma shock waves.

关键词： rear surface of fused silica laser-induced plasma Raman spectroscopy different thickness finite element method

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Synthesis and Properties of Hydroxytelechelic Polyisobutylenes by End Capping with tert-Butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane

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Chinese Journal of Polymer Science 2019年第9期37卷 936-942页

作者： jing Li Kang-Da Wu Huang Shan jing-han Zhang Ming Zhao Guang-Bi Gong Wen-Li Guo Yi-Bo Wu College of Materials Science & Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Lanzhou Petrochemical Research Center Petrochina Lanzhou 730060 China Beijing Key Laboratory of Specialty Elastomer Composite Materials Beijing Institute of Petrochemical Technology Beijing 102617 China

The low-activity cationic monomer tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane was synthesized by Grignard reaction and hydroxyl-protection reaction. Living polyisobutylene chains were initially synthesized by controlled cationic polymerization and then capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane. The hydrolysis of these polyisobutylenes end capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane gave rise to hydroxytelechelic polyisobutylene. NMR analysis confirmed that the hydrolysis was complete. Results also showed that a low polymerization temperature favored the participation of tert-butyl-dimethyl-(4- methyl-pent-4?enyloxy)-silane in the end-capping reaction. Moreover, polyisobutylene-based polyurethane exhibited greater acid resistance than commercial polyurethane.

关键词： Carbocationic polymerization Polyisobutylene Hydrolysis Polyisobutylene-based polyurethane

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Fiber Optic 3-Component Seismometer

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Photonic Sensors 2014年第2期4卷 102-107页

作者： jing han Wentao ZhanG Dongshan JIANG Zhaogang WANG Fang LI Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences No. 35 Qinghua EastRoad Hai dian District Beijing 100083 China

An all-metal 3-component optical fiber seismometer was proposed and experimentally demonstrated. The theoretical analysis was given based on the electro-mechanical theory. Calibration results showed that the axis sensitivity was about 41 dB （re： 0dB=1rad/g） with a fluctuation ＋2dB in the frequency bandwidth of 5 Hz - 400 Hz. A transverse sensitivity of about -40 dB was achieved. The fluctuation of the acceleration sensitivity for the three accelerometers in the seismometer was within ±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated cartier （PGC） was 10-Srad/√Hz, and the minimum detectable acceleration was calculated to be 90 ng/√Hz.

关键词： Fiber optic seismometer transverse sensitivity accelerometer

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High temperature oxidation properties of Al-Cu-Si alloys for latent heat energy storage

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Energy and Built Environment 2023年第3期4卷 308-314页

作者： Junwen Zhao Yan Shi Yanping Yuan Xingmin Huang jing han School of Materials Science and Engineering Key Lab of Advanced Technologies of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

The effect of Cu content on the high temperature oxidation properties of the phase change material(PCM)Al-Cu-Si alloys was *** oxidation kinetics curves at 600◦C were achieved for Al-Cu-Si alloys with 35-55%Cu,which all follow the cubic *** an increase in the Cu content from 35 to 55%,the weight gain decreases from 5.75 to 3×10^(−4) g/cm^(2) after 96 h isothermal *** oxidation rate also decreases with Cu content,the maximum and minimum rates are 1.52 and 0.32×10^(−5) g/cm^(2)•h,a nearly 4 times *** does not change the phase composition of Al-Cu-Si alloys,but coarsens the *** latent heat and the starting temperature of phase change after 96 h oxidation at 600◦C have variations of less than 10%and 6◦C,respectively,indicating that the Al-Cu-Si alloys have good thermal stability after high temperature oxidation.

关键词： Al-Cu-Si alloy PCMs Oxidation properties Thermal stability

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QoS-aware replica placement for data intensive applications

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The Journal of China Universities of Posts and Telecommunications 2013年第3期20卷 43-47页

作者： FU Xiong ZHU Xin-xin han jing-yu WANG Ru-chuan School of of Computer Nanjing University of Posts and Telecommunications

In recent years, with the rapid development of data intensive applications, data replication has become an enabling technology for the data grid to improve data availability, and reduce file transfer time and bandwidth consumption. The placement of replicas has been proven to be the most difficult problem that must be solved to realize the process of data replication. This paper addresses the quality of service （QoS） aware replica placement problem in data grid, and proposes a dynamic programming based replica placement algorithm that not only has a QoS requirement guarantee, but also can minimize the overall replication cost, including storage cost and communication cost. By simulation, experiments show that the replica placement algorithm outperforms an existing popular replica placement technique in data grid.

关键词： data grids data replication replica placement dynamic programming

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Microstructure and texture evolution of Mg–7Y–1Nd–0.5Zr alloy sheets with different rolling temperatures

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Rare Metals 2020年第11期39卷 1273-1278页

作者： jing-Bao Liu Kui Zhang jing-Tao han Xing-Gang Li Yong-Jun Li Ming-Long Ma Jia-Wei Yuan Guo-Liang Shi State Key Laboratory for Fabrication and Processing of Nonferrous Metals Beijing General Research Institute for Nonferrous MetalsBeijing100088China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China

The extruded Mg-7Y-1Nd-0.5Zr(wt%)alloy were performed to the same strain hot rolling with different *** microstructure and texture evolution of the sheets were investigated by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and electron back-scattered diffraction(EBSD).The results indicate that the microstructure becomes homogeneous after hot rolling process and precipitated phase distributes at grain boundaries along rolling *** the increase in rolling temperature,the grains of sheet grow *** sheet rolling at 400℃is composed of recrystallization grains,the necklace of the precipitated phase in the grain boundaries and excessive *** structure of necklace of the precipitated phase is fcc structure with lattice constant of a=0.75 *** rolling temperatures increasing from 400 to 450℃,the content of recrystallized grains in volume fraction with relatively random orientations increases *** with the rolling process at 400℃,the amount of precipitated phases is reduced at the grain boundary,and the precipitated phase begins to appear in the grain interior when rolling at 450℃.The structure of the precipitated phase is fcc with lattice constant of a=2.22 *** recrystallization grains begin to grow in the rolling process at 500℃.The basal texture is obviously produced during the rolling process at 400 and 450℃;however,the basal texture is weak in the rolling process at 500℃.

关键词： Rare earth magnesium alloy Rolling Texture Precipitated phase

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