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Examining the Spatiotemporal Dynamics and Determinants of Land Urbanization in Prefecture-level Cities,China

Chinese Geographical Science 2024年第1期34卷 19-33页

作者： yang Zhen ZHU Huxiao ZHANG Xinlin ou Xiangjun School of Geography Geomatics and Planning&Urban-rural Integration Development Research InstituteJiangsu Normal UniversityXuzhou221116China

Examining the spatiotemporal dynamics and determinants of land urbanization is critical for promoting healthy urban development and the rational use of land *** on the dataset consisting of land use change data and selected factors in 2010 and2020,this study used visual analysis to reveal the spatiotemporal dynamics of land urbanization across prefecture-level cities in ***,the driving forces underlying land urbanization were examined by using geographical detector *** are the findings:1)we find that there exist notable spatial variances in land urbanization across prefecture-level ***,the differentiation in land urbanization between the northern and southern cities is more pronounced than that between the coastal and inland cities,or between the eastern and western ***-level cities located in central and western China have experienced the most rapid growth in land ***,the growth rate in northeastern China is the lowest,while the velocity in eastern China remains relatively *** using spatial autocorrelation analysis,this study reveals that the land urbanization level in prefecture-level cities has significant spatial agglomeration.2)We further find that land urbanization in China is influenced by factors related to urban land supply and demand,and urban population growth,economic growth,land financial and political incentive have greater impact on land urbanization than other factors.3)We also find that the impacts of determinants on China’s land urbanization vary over time,the explanatory power of economic development increased,while the explanatory power of state forces *** argue that integrating the supply and demand factors of land urbanization can provide a more comprehensive understanding of the driving mechanisms underlying land urbanization in China and other transitional countries,and help decision-makers in these countries formulate more detailed and specif

关键词： land urbanization spatial pattern influencing factor geographical detector China

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Silicate ions as soluble form of bioactive ceramics alleviate aortic aneurysm and dissection

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Bioactive Materials 2023年第7期25卷 716-731页

作者： Yumei Que Zhaowenbin Zhang Yanxin Zhang Xin Li Likai Chen Peier Chen Caiwen ou Chen yang jiang Chang Joint Centre of Translational Medicine The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiang325000China Shanghai Institute of Ceramics Chinese Academy of Sciences(CAS)1295 Dingxi RoadShanghai200050China Joint Centre of Translational Medicine Wenzhou InstituteUniversity of CASWenzhouZhejiang325000China oujiang Laboratory WenzhouZhejiang325000China Center of Materials Science and Optoelectronics Engineering University of CAS19 Yuquan RoadBeijing100049China Wenzhou Medical University WenzhouZhejiang325000China Zhujiang Hospital Southern Medical UniversityGuangzhouGuangdong510280China

Aortic aneurysm and dissection(AAD)are leading causes of death in the *** studies have demonstrated that silicate ions can manipulate multiple cells,especially vascular-related *** demonstrated in this study that silicate ions as soluble form of bioactive ceramics effectively alleviated aortic aneurysm and dissection in both Ang II andβ-BAPN induced AAD *** from the single targeting therapeutic drug approaches,the bioactive ceramic derived approach attributes to the effect of bioactive silicate ions on the inhibition of the AAD progression through regulating the local vascular microenvironment of aorta systematically in a multi-functional *** in vitro experiments revealed that silicate ions did not only alleviate senescence and inflammation of the mouse aortic endothelial cells,enhance M2 polarization of mouse bone marrow-derived macrophages,and reduce apoptosis of mouse aortic smooth muscle cells,but also regulate their *** in vivo studies further confirm that silicate ions could effectively alleviate senescence,inflammation,and cell apoptosis of aortas,accomplished with reduced aortic dilation,collagen deposition,and elastin laminae *** bioactive ceramic derived therapy provides a potential new treatment strategy in attenuating AAD progression.

关键词： Silicate ions Aortic aneurysm and dissection Senescence Inflammation Cell apoptosis

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Accelerating the HS-type Richardson Iteration Method with Anderson Mixing

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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 *** upper bounds of spectral radii of iteration matrices are studied,and then the convergence theories of the AHSR iteration methods are ***,the optimal iteration parameters are provided,which can be computed *** 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

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Measurement method and results of divergence angle of laser-controlled solid propellants used in space propulsion

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Chinese Journal of Aeronautics 2023年第9期36卷 195-206页

作者： yang ou Jianjun WU Yuqiang CHENG Yu ZHANG Yuqi LI College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

The plume divergence angle is an important reference index for evaluating the thrust efficiency and propellant utilization of space propulsion ***,the characteristics of the dynamic variation of plume divergence angle over time cannot be measured using current *** paper utilizes high-speed photography and image processing methods to develop a strategy that can give a quick,non-destructive and real-time detection of the divergence *** of the strategy is verified,and the characteristics of plume divergence angles of different lasercontrolled solid propellants were further analyzed and *** experimental results indicate that graphene could effectively reduce the divergence angle,while oxide-doped samples had larger divergence angles than alloy-doped and carbon-doped samples.

关键词： Ablation Image processing Laser Plume divergence angle Propellant Space application

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Parallel computing approach for efficient 3-D X-ray-simulated image reconstruction

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Nuclear Science and Techniques 2023年第7期34卷 122-136页

作者： ou-Yi Li yang Wang Qiong Zhang Yong-Hui Li University of Electronic Science and Technology of China Chengdu 610000China National Supercomputing Center in Chengdu Chengdu 610041China

Accurate 3-dimensional(3-D)reconstruction technology for nondestructive testing based on digital radiography(DR)is of great importance for alleviating the drawbacks of the existing computed tomography(CT)-based *** commonly used Monte Carlo simulation method ensures well-performing imaging results for ***,for 3-D reconstruction,it is limited by its high time *** solve this problem,this study proposes a parallel computing method to accelerate Monte Carlo simulation for projection images with a parallel interface and a specific DR *** images are utilized for 3-D reconstruction of the test *** verify the accuracy of parallel computing for DR and evaluate the performance of two parallel computing modes-multithreaded applications(G4-MT)and message-passing interfaces(G4-MPI)-by assessing parallel speedup and *** study explores the scalability of the hybrid G4-MPI and G4-MT *** results show that the two parallel computing modes can significantly reduce the Monte Carlo simulation time because the parallel speedup increment of Monte Carlo simulations can be considered linear growth,and the parallel efficiency is maintained at a high *** hybrid mode has strong scalability,as the overall run time of the 180 simulations using 320 threads is 15.35 h with 10 billion particles emitted,and the parallel speedup can be up to *** 3-D reconstruction of the model is achieved based on the filtered back projection(FBP)algorithm using 180 projection images obtained with the hybrid G4-MPI and *** quality of the reconstructed sliced images is satisfactory because the images can reflect the internal structure of the test *** method is applied to a complex model,and the quality of the reconstructed images is evaluated.

关键词： Parallel computing Monte Carlo Digital radiography 3-D reconstruction

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Cinobufacini-induced HeLa cell apoptosis enhanced by curcumin

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Chinese Science Bulletin 2013年第21期58卷 2584-2593页

作者： LIU Li JIN Hua ou JinLai jiang JinHuan PI jiang KE ChangHong yang Fen QIAO DongJuan CAI HuaiHong CAI JiYe Department of Chemistry and Institute for Nano-Chemistry Jinan University Department of Pharmaceutics College of Pharmacy Jinan University

When used in combination with certain chemotherapies, curcumin has been shown to increase apoptosis in several cancer cell lines. Here, we report the combined effects of curcumin and cinobufacini on human cervical carcinoma cells. The aim of this study was to examine whether curcumin could enhance apoptosis induced by cinobufacini. 3-(4,5-Dimethylthiazol-2-y1)-2,5- diphenytetrazolium bromide (MTT) assays revealed that the growth and proliferation of HeLa cells could be inhibited by 75% after a combined treatment of 25 μg/mL cinobufacini and 8 μg/mL curcumin. The combined treatment is 3 times more effective than treatment with 25 μg/mL cinobufacini alone. Annexin V-FITC/PI staining, morphological changes and immunofluorescence verified a significant enhancement in cinobufacini-induced apoptosis when cells were also exposed to curcumin. The data showed that the proportion of early apoptotic cells significantly increased from 15.43% in cells treated only with 25 μg/mL cinobufacini to 49.2% in cells treated with 25 μg/mL cinobufacini and 8 μg/mL curcumin. Moreover, compared with treatment of only 25 μg/mL cinobufacini, ROS production increased 1.7-fold, the intracellular free Ca 2+ concentration increased 1.5-fold, and the mitochon- drial membrane potential decreased by 20% in the combined treatment. Simultaneously, the atomic force microscopy (AFM) re- sults suggest that cells treated with a combination of cinobufacini and curcumin varied significantly in shape and ultrastructure. Collapsed cells with leaking cytoplasm, blebbing pores and emerging apoptotic bodies were prevalent. The nanoparticle size increased from 70 nm when the cells were treated with 25 μg/mL cinobufacini to 190 nm when the cells were treated with 25 μg/mL cinobufacini and 8 μg/mL curcumin. The size increase resulted in the cell membrane becoming considerably rough. These results can improve our understanding of combination treatments. Specifically, the combination of cinobufacini and curcumin may

关键词： HeLa细胞细胞凋亡姜黄素诱导原子力显微镜超微结构变化蟾联合治疗

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Luminescence and magnetic properties of bifunctional nanoparticles composited by nitrogen-doped graphene quantum dots and gadolinium

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Journal of Rare Earths 2024年第4期42卷 716-723页

作者： Wanli Zhang Hao Zhou Meigui ou Donghao Sun Chunlin yang College of Materials and Metallurgy University of GuizhouGuiyang550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang550025 China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang550003China

In this paper,nitrogen-doped graphene quantum dots(N-GQDs)were combined with gadolinium ions(Gd^(3+))by a surface modification to obtain magneto-optical dual-functional N-GQDs/Gd^(3+)*** morphology of obtained composite was characterized by field emission scanning electron microscopy and transmission electron *** and magnetic properties were measured by a fluorescence spectrophotometer and a vibrating sample magnetometer,*** indicate that well-dispersed spherical N-GQDs/Gd^(3+)nanoparticles have an average diameter of 7 nm.N-doping significantly increases the luminesce nce of particles with an optimal luminescence intensity at 20℃and pH=9.X-ray photoelectron spectroscopy results indicate that the N-doping introduces pyrrolic N as an electron donor,enhancing fluorescence by increasing the surface electron cloud density of *** addition,density functional theory calculation results reveal that N-doping reduces the band gap of NGQDs/Gd^(3+),enabling electronic transitions to higher energy levels and generating more activation sites,thereby enhancing *** to N-GQDs/Gd^(3+)prepared at 20℃,the saturated magnetization of particles prepared at 40℃is 0.85 emu/g,indicating a better magnetic *** above results suggest that bifunctional nanomaterials N-GQDs/Gd^(3+)with excellent optical properties and magnetism can be better used for fluorescence and magnetic resonance imaging.

关键词： Nitrogen-doped graphenequantum dots Gadolinium Luminescence Magnetism Rare earths

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Excitation Spectrum of Three Dressed Bose-Einstein Condensates

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Chinese Physics Letters 2000年第9期17卷 628-630页

作者： ou-yang Zhong-Wen KUANG Le-Man Department of Physics Hu’nan Normal UniversityChangsha 410081

We study quantum dynamics of three dressed Bose-Einstein condensates in a high-Q *** quasiparticle excitation spectrum of this system is found *** stability of the quasiparticle excitation is *** is shown that there e... 详细信息

关键词： spectrum. cavity. excitation

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Edge induced band bending in van der Waals heterojunctions:A first principle study

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Nano Research 2020年第3期13卷 701-708页

作者： yang ou Zhuo Kang Qingliang Liao Zheng Zhang Yue Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity cf Science and Technology BeijingBeijing 100083China

The dangling bond free nature of two-dimensional(2D)material surface/interface makes van der Waals(vdW)heterostructure attractive for novel electronic and optoelectronic *** in practice,edge is unavoidable and could cause band bending at 2D material edge analog to surface/interface band bending in conventional three-dimensional(3D)***,we report a first principle simulation on edge band bending of free standing MoS2/WS2 vdW *** to the imbalance charges at edge,S terminated edge causes upward band bending while Mo/W terminated induces downward bending in undoped *** edge band bending is comparable to band gap and could obviously harm electronic and optoelectronic *** also investigate the edge band bending of electrostatic doped heterojunction.N doping raises the edge band whereas p doping causes a decline of edge *** n doping even reverses the downward edge band bending at Mo/W terminated *** contrast,heavy p doping doesn’t invert the upward bending to *** with former experiments,the expected band gap narrowing introduced by interlayer potential gradient at edge is not observed in our free-standing structures and suggests substrate’s important role in this imbalance charge induced phenomenon.

关键词： edge band bending imbalance charge electrostatic doping transition metal dichalcogenides(TMDCs)van der Waals(vdW)heterojunction first principle

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The associated evolution of raptorial foreleg and mantispid diversification during 200 million years

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National Science Review 2023年第12期10卷 49-52页

作者： Dahang Lai Peichao Chen Shumin Li Xianzhe Xiang Haohong ou Nuoyao Kang Jingtao yang Hong Pang Chung kun Shih Conrad C.Labandeira Dong Ren Qiang yang Chaofan Shi School of Earth Sciences and Engineering Guangdong Provincial Key Lab of Geological Processes and Mineral Resources Sun Yat-sen University School of Life Sciences Key Laboratory of Conservation and Application in Biodiversity of South China Guangzhou University School of Ecology Sun Yat-sen University College of Life Sciences Capital Normal University Department of Paleobiology National Museum of Natural HistorySmithsonian Institution Department of Entomology University of Maryland College Park

Adaptive evolution of predatory structure grants carnivores selective advantages[1], which evokes questions regarding the mechanism of functional adaptation via morphological variation and their potential impact on lineage diversification. Raptorial foreleg, as a key predatory structure in insects, is typically characterized by elongate coxae and stout femora possessing spines, and has evolved independently in many lineages [2].

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