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Spatial Equity of Basic Education Resources and Coordinated Regional Development in Xinjiang, China

Chinese Geographical Science 2023年第3期33卷 441-457页

作者： han tao FAN Jie GUO Rui SUN Yong CHEN Dong LIU Baoying LIAN Yanan School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Xinjiang Vocational University Urumqi 830013China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Institutes of Science and Development Chinese Academy of SciencesBeijing 100190China School of Public Administration Guangzhou UniversityGuangzhou 510006China

Public services,including education,are important elements that affect people’s living *** spatial equity in education resources is a crucial indicator of China’s coordinated regional development in the new ***,a border area and home to many ethnic minorities,is a relatively underdeveloped region in *** the cross-regional allocation of basic education resources and forming a coordinated regional development is of great significance for achieving the general goal of social stability and long-term peace in *** study adopts a spatial equity analysis framework that incorporates spatial scale,time dimension,factor indicators,and educational *** Gini coefficient is used to examine the variability of spatial equity of educational resources in *** show that the spatial variability of educational resources in Xinjiang increases as the spatial scale becomes *** coefficients of variability at provincial,prefectural,and county levels are 0.207,0.257,and 0.302,*** spatial variability shows an increasing trend before 2010 and decreases significantly after *** terms of elementary indicators,the spatial variability of the number of schools per 10000 people is the largest,with Gini coefficients in the range of *** teacher-student ratio has a Gini coefficient in the range of 0.068-0.174,and class size has a Gini coefficient in the range of *** terms of educational stages,the spatial variability is most prominent in elementary schools,with a coefficient of variation of *** high schools have a coefficient of variation of 0.220-0.260,while junior high schools are the most balanced,with a coefficient of variation *** study also discussed the coupling and coordination relationship between educational resources and regional economic development in *** development plays a facilitating role in promoting balanced education,and the couplin

关键词： coordination elementary coordinated

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Decoupled thermal–hydraulic analysis of an air-cooled separated heat pipe for spent fuel pools under natural convection

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Nuclear Science and Techniques 2023年第6期34卷 183-197页

作者： Hui-Lin Xue Jian-Jie Cheng Wei-Hao Ji Wen-Jin Li han-Zhong tao Wei Li College of Urban Construction Nanjing Tech UniversityNanjing211800China School of Energy Science and Engineering Nanjing Tech UniversityNanjing211800China

An investigation of the decoupled thermal–hydraulic analysis of a separated heat pipe spent fuel pool passive cooling system(SFS)is essential for practical engineering *** on the principles of thermal and mass balance,this study decoupled the heat transfer processes in the *** accordance with the decoupling conditions,we modeled the spent fuel pool of the CAP1400 pressurized water reactor in Weihai and used computational fluid dynamics to explore the heat dissipation capacity of the SFS under different air temperatures and wind *** results show that the air-cooled separated heat pipe radiator achieved optimal performance at an air temperature of 10℃ or wind speed of 8 m/*** equations for the equivalent thermal conductivity of the separated heat pipes with the wind speed and air temperature we obtained according to the thermal resistance network *** study is instructive for the actual operation of an SFS.

关键词： Decoupled analysis Separated heat pipe CAP1400 Finned tube radiator Passive cooling

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A Fast and Room-temperature Self-healing Thermal Conductive Polymer Composite

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Chinese Journal of Polymer Science 2021年第10期39卷 1328-1336,I0008页

作者： De-Wei Yue Hong-Qin Wang han-Qing tao Peng Zheng Cheng-Hui Li Jing-Lin Zuo State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNational Laboratory of MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Thermal conducting materials may be damaged during long-term use,resulting in the increase of thermal resistance and therefore inefficient heat *** introduction of self-healing ability may solve this problem,but the realization of fast and room-temperature self-healing in thermal conducting composites is quite ***,we choose a flexible poly(dimethylsiloxane)polymer material(PDMS-COOH)as the matrix and graphene nanosheets as the thermal conductive filler to prepare a new kind of thermal conductive polymer composite(PDMS-COOH-CG)that can quickly self-heal at room *** thermal conductivity of PDMS-COOH-CG10 with 10%of graphene content is 0.48 W·m^(-1)·K^(-1),which is 16 times that of PDMS-COOH(0.03 W·m^(-1)·K^(-1)).At room temperature,self-healing efficiency of PDMS-COOH-CG10 based on tensile strength can be 53.8%for 30 s and 84.6%for 24 *** infrared thermal imaging dipicted that after 2 min of self-healing at room temperature,the thermal conduction temperature near the damage was basically restored to the level of the pristine sample.

关键词： Self-healing Thermal conductive Infrared thermal imaging

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Defect-manipulated magnetoresistance and above-room-temperature ferromagnetism in two-dimensional BaNi_(2)V_(2)O_(8)

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Chinese Chemical Letters 2024年第3期35卷 523-527页

作者： Pengfei Tan Chuanhui Zhu Jinjin Yang Shuang Zhao tao Xia Mei-Huan Zhao tao han Zheng Deng Man-Rong Li Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-sen UniversityGuangzhou 510006China School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Science Hainan UniversityHaikou 570228China

The intricate correlation between multiple degrees of freedom and physical properties is a fascinating area in solid state chemistry and condensed matter ***,we report a quantum-magnetic system BaNi_(2)V_(2)O_(8)(BNVO),in which the spin correlation was modulated by unusual oxidation state,leading to different magnetic *** BNVO was modified with topochemical reduction(TR)to yield TR-BNVO with partially reduced valance state of Ni^(+)in the two-dimensional NiO_(6)-honeycomb ***,the antiferromagnetic order is suppressed by the introduction of locally interposed Ni^(+)and oxygen vacancies,resulting in a ferromagnetic ground state with the transition temperature up to 710 K.A positive magnetoresistance(7.5%)was observed in the TR-BNVO at 40 K under 7 *** findings show that topological reduction is a powerful approach to engineer low-dimensional materials and accelerate the discovery of new quantum magnetism.

关键词： Layered honeycomb oxide Topochemical reduction Oxygen vacancies Ferromagnetism Magnetoresistance

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Improving global weather and ocean wave forecast with large artificial intelligence models

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Science China Earth Sciences 2024年第12期67卷 3641-3654页

作者： Fenghua LING Lin OUYANG Boufeniza Redouane LARBI Jing-Jia LUO tao han Xiaohui ZHONG Lei BAI Institute for Climate and Application Research(ICAR)/CIC-FEMD/KLME/ILCEC School of Future TechnologyNanjing University of Information Science and TechnologyNanjing 210044China Ganzhou Meteorological Bureau Ganzhou 341000China Shanghai AI Laboratory Shanghai 200232China The Hong Kong University of Science and Technology Hong Kong 999077China Artificial Intelligence Innovation and Incubation Institute of Fudan University Shanghai 201203China

The rapid advancement of artificial intelligence technologies,particularly in recent years,has led to the emergence of several large parameter artificial intelligence weather forecast *** models represent a significant breakthrough,overcoming the limitations of traditional numerical weather prediction models and indicating the emergence of profound potential tools for atmosphere-ocean *** study explores the evolution of these advanced artificial intelligence forecast models,and based on the identified commonalities,proposes the“Three Large Rules”for large weather forecast models:a large number of parameters,a large number of predictands,and large potential *** discuss the capacity of artificial intelligence to revolutionize numerical weather prediction,briefly outlining the underlying reasons for the significant improvement in weather *** acknowledging the high accuracy,computational efficiency,and ease of deployment of large artificial intelligence forecast models,we also emphasize the irreplaceable values of traditional numerical forecasts and explore the challenges in the future development of large-scale artificial intelligence atmosphere-ocean forecast *** believe that the optimal future of atmosphere-ocean weather forecast lies in achieving a seamless integration of artificial intelligence and traditional numerical *** a synthesis is anticipated to offer a more advanced and reliable approach for improved atmosphere-ocean ***,we illustrate how forecasters can leverage the large weather forecast models through an example by building an artificial intelligence model for global ocean wave forecast.

关键词： Numerical weather prediction Deep learning Large AI weather forecast models Global ocean wave forecast

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Photoelectrocatalytic hydrogen evolution and synchronous degradation of organic pollutants by pg-C_(3)N_(4)/β-FeOOH S-scheme heterojunction

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Science China(Technological Sciences) 2024年第4期67卷 1238-1252页

作者： LI XiBao han tao ZHOU YingTang XIE Yu LUO YiDan HUANG JunTong CHEN Zhi DENG Fang School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China

Crafting photoelectrocatalytic materials with robust oxidation-reduction properties for simultaneous hydrogen evolution and pollutant degradation poses a formidable *** this study,a pg-C_(3)N_(4)/β-FeOOH S-scheme heterostructure with a special energy band structure was developed by anchoring porous pg-C_(3)N_(4)on needle shapedβ-*** as a hole extraction layer,needle-leaf-likeβ-FeOOH can facilitate efficient hole migration and enhance charge ***,the optimized 0.2-pg-C_(3)N_(4)/β-FeOOH could degrade 78%of ofloxacin(OFLO)in 90 *** organic pollutants could absorb a large number of holes,which prompted a greater proportion of photogenerated electrons to actively participate in the hydrogen evolution reaction at the ***,the hydrogen production of 0.2-pg-C_(3)N_(4)/β-FeOOH reached 1452.88μmol cm^(-2)h^(-1),exhibiting a notable increase of 61.81-165.12μmol cm^(-2)h^(-1)compared with that in the absence of *** and theoretical calculation results underscore that this investigation is grounded in a distinctive electron and hole dual channel transfer *** findings offer novel insights for the future development of S-scheme heterojunction photoelectrocatalytic materials capable of concurrently degrading pollutants and promoting hydrogen evolution.

关键词： photoelectrocatalysis hydrogen evolution degradation synchronous S-scheme heterojunction

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Differential equation dynamical system based assessment model in GNSS interoperability

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 996-1003页

作者： han tao LU XiaoChun WANG Xue RAO YongNan ZOU DeCai YANG JianFei WU YangYang National Time Service Center Xi'an 710600China Key Laboratory of Precision Navigation and Timing Technology Chinese Academy of SciencesXi'an 710600China Graduate University of the Chinese Academy of Sciences Beijing 100049China Department of Economics and Management Northwestern UniversityXi'an 710127China

With the development of Global Navigation Satellite System (GNSS),the idea of GNSS interoperability is born and has become the focus of study in the field of satellite *** popularity for GNSS to augment the interoperability with the existing ones necessitates the study of the assessment algorithm of this *** this paper,an assessment algorithm for interoperability comprehensive benefits based on the differential equation dynamical system is *** are two important aspects in GNSS that interoperability will affect:one is the performance advancement;the other one is the cost of adopting *** researching the complex relationship between the performance and cost,we found this relationship is similar as what between prey and predator in biomathematics,so the Lotka-Volterra model used to depict the prey-predator relationship is a felicitous *** building a differential dynamical model,we analyze the existence and stability of the positive equilibrium in the *** a Cost-Effective Function of GNSS is constructed based on the positive equilibrium,which is employed to assess the interoperability,qualitatively and ***,the paper demonstrates the significance of the model and its application by citing a numerical example.

关键词： interoperability assessment model differential dynamical system GNSS stability

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Synthesis and Luminescence Properties of(Y, Gd)(P, V)O_4:Eu^(3+), Bi^(3+) Red Nano-phosphors with Enhanced Photoluminescence by Bi^(3+), Gd^(3+) Doping

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Nano-Micro Letters 2013年第2期5卷 117-123页

作者： Yong Pu Ke Tang Da-Chuan Zhu tao han Cong Zhao Ling-Ling Peng College of Material Science and Engineering Sichuan University College of Information Engineering Chengdu University of Technology Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology

A series of(Y_(1-y), Gdy)_(0.95-x)(P_y, V_(1-y))O_4 :0.05Eu^(3+), xBi^(3+)+phosphors have been successfully prepared by a subsection method. The crystal structure, surface morphology and luminescence properties were investigated. It was found that the sintered samples crystallized in a tetragonal crystal system with space group I_(41)/amd(a = b = 0.7119 nm, c = 0.6290 nm). The products presented rod-like morphology with length of 100-150 nm and width of 50-100 nm. A maximum peak at 619 nm(~5D_0 →~7F_2) was observed in emission spectrum of the phosphors. It was also found that co-doping of Bi^(3+)+, P5+and Gd^(3+)ions into YVO_4:Eu^(3+)can not only made the right edge of the excitation band shift to the long-wavelength region, but also increased the emission intensity at 619 nm sharply and decreased the lifetime of fluorescence decay. These results may expand the application scope of the phosphors.

关键词： (Y,Gd)(P,V)O4:Eu3+,Bi3+ Rod-like Red phosphors Photoluminescence Doping

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First-principles study on the mechanics, optical, and phonon properties of carbon chains

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Chinese Physics B 2018年第11期27卷 559-567页

作者： Jin-Ping Li Song-He Meng han-tao Lu Takami Tohyama National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructureHarbin Institute of TechnologyHarbin 150080China Center for Interdisciplinary Studies&Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China Department of Applied Physics Tokyo University of ScienceTokyo 125-8585Japan

Besides graphite,diamond,graphene,carbon nanotubes,and fullerenes,there is another allotrope of carbon,carbyne,existing in the form of a one-dimensional chain of carbon *** has been theoretically predicted that carbyne would be stronger,stiffer,and more exotic than other materials that have been synthesized *** this article,two kinds of carbyne,i.e.,cumulene and polyyne are investigated by the first principles,where the mechanical properties,electronic structure,optical and phonon properties of the carbynes are *** results on the crystal binding energy and the formation energy show that though both are difficult to be synthesized from diamond or graphite,polyyne is more stable and harder than *** tensile stiffness,bond stiffness,and Young's modulus of cumulene are 94.669 eV/Å,90.334 GPa,and 60.62 GPa,respectively,while the corresponding values of polyyne are 94.939 eV/Å,101.42 GPa,and60.06 *** supercell calculation shows that carbyne is most stable at N=5,where N is the supercell number,which indicates that the carbon chain with 10 atoms is most *** calculation on the electronic band structure shows that cumulene is a conductor and polyyne is a semiconductor with a band gap of 0.37 *** dielectric function of carbynes varies along different directions,consistent with the one-dimensional nature of the carbon *** the phonon dispersion of cumulene,there are imaginary frequencies with the lowest value down to-3.817 THz,which indicates that cumulene could be unstable at room temperature and normal pressure.

关键词： carbyne first-principles calculation electronic structure physical properties

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CYP24A1 Involvement in Inflammatory Factor Regulation Occurs via the Wnt Signaling Pathway

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Current Medical Science 2022年第5期42卷 1022-1032页

作者： Xue-qi CHEN Jia-yu MAO Chun-saier WANG Wen-bin LI tao-tao han Ke LV Jing-nan LI Department of Medical Ultrasound Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical ScienceBeijing100730China Department of Critical Care Medicine Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical ScienceBeijing100730China Department of Gastroenterology Beijing Friendship HospitalCapital Medical UniversityBeijing100050China Department of Gastroenterology Beijing HospitalNational Center of GerontologyInstitute of Geriatrics MedicineChinese Academy of Medical SciencesBeijing100730China Department of Gastroenterology Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical Science Key Laboratory of Gut Microbiota Translational Medicine Research Chinese Academy of Medical ScienceBeijing100730China

Objective While the upregulation of cytochrome P450 family 24 subfamily A member 1(CYP24A1)gene expression has been reported in colon cancer,its role in tumorigenesis remains largely *** this study,we aimed to investigate the involvement of CYP24A1 in Wnt pathway regulation via the nuclear factor kappa B(NF-κB)*** The human colon cancer cell lines HCT-116 and Caco-2 were subjected to stimulation with interleukin-6(IL-6)as well as tumor necrosis factor alpha(TNF-α),with subsequent treatment using the NF-κB pathway-specific inhibitor ammonium pyrrolidinedithiocarbamate(PDTC).Furthermore,CYP24A1 expression was subjected to knockdown via the use of small interfering RNA(siRNA).Subsequently,NF-κB pathway activation was determined by an electrophoretic mobility shift assay,and the transcriptional activity ofβ-catenin was determined by a dual-luciferase reporter assay.A mouse ulcerative colitis(UC)-associated carcinogenesis model was established,wherein TNF-αand the NF-κB pathway were blocked by anti-TNF-αmonoclonal antibody and NF-κB antisense oligonucleotides,*** the tumor size and protein level of CYP24A1 were *** IL-6 and TNF-αupregulated CYP24A1 expression and activated the NF-κB pathway in colon cancer *** significantly inhibited this increase in CYP24A1 ***,knockdown of CYP24A1 expression by siRNA could partially antagonize Wnt pathway *** CYP24A1 expression was observed in the colonic epithelial cells of UC-associated carcinoma mouse ***-TNF-αmonoclonal antibody and NF-κB antisense oligonucleotides decreased the tumor size and suppressed CYP24A1 *** Taken together,this study suggests that inflammatory factors may increase CYP24A1 expression via NF-κB pathway activation,which in turn stimulates Wnt signaling.

关键词： CYP24A1 Wnt/β-catenin signaling pathway colorectal neoplasms

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