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High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

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Journal of Advanced Ceramics 2024年第2期13卷 143-154页

作者： Qiyao Deng Pengfei He Chuan sun Yang Li yue Xing Yujie Wang Jinglong Li Xiubing Liang Xin Wang Yujie Zhou Yujun Cai National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould Tianjin University of Technology and EducationTianjin 300222China Defense Innovation Institute Academy of Military ScienceBeijing 100071China School of mechanical engineering Tianjin University of Technology and EducationTianjin 300222China Scientific and Technological Innovation Center Beijing 100012China

Ultra-high temperature ceramic(UHTC)coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal *** study provides a new approach to fabricate UHTC coatings with high speed laser cladding(HSLC)technology,and places more emphasis on investigating the formation mechanism,phase compositions,and mechanical properties of HSLC-UHTC *** show that a well-bonded interface between the coating and the tantalum alloy substrate can be *** coating is mainly composed of(Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W)metal solid solution *** a relatively high powder feeding rate,the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to~50μm is successfully *** for the mechanical properties of the HSLC coatings,the fracture toughness of the coating decreases with the increase of powder feeding *** increase of carbide solid solution phase can significantly improve the high temperature microhardness(552.7±1.8 HV0.5@1000℃).The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer,which is a very promising candidate scheme for thermal protection coating.

关键词： high speed laser cladding(HSLC) ultra-high temperature ceramic(UHTC) thermal protection coating microstructure mechanical properties

新质生产力引领城市高质量发展:机理、困境与路径

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四川师范大学学报（社会科学版） 2024年第4期51卷 81-90,202页

作者：项松林孙悦安徽建筑大学公共管理学院上海大学社会学院

新质生产力在要素结构、支撑载体、功能机制、形态模式上具有高科技、高水平、高效能、高质量、高阶性等内涵与特质。城市是承载人口的重要空间、创新活动的重要策源地、经济发展的重要引擎,城市高质量发展是经济社会高质量发展的重中... 详细信息

新质生产力在要素结构、支撑载体、功能机制、形态模式上具有高科技、高水平、高效能、高质量、高阶性等内涵与特质。城市是承载人口的重要空间、创新活动的重要策源地、经济发展的重要引擎,城市高质量发展是经济社会高质量发展的重中之重。新质生产力通过高科技赋能,引领城市新型要素集聚;通过高水平支撑,引领城市产业结构优化;通过高效能变革,引领城市动能转换;通过高阶性跃迁,引领城市形态升级。当前我国城市高质量发展还面临动力变革、产业支撑、品质提升、形态跃迁等现实困境。在全面推进中国式城市现代化的新征程上,要坚持创新驱动,形塑城市高质量发展的新动能;推动产业升级,夯实城市高质量发展的新基础;全面深化改革,健全城市高质量发展的新机制;推动“四化”协同,创新城市高质量发展的新模式。

关键词：新质生产力城市高质量发展新型城市建设

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新型城市建设与中国式城市现代化

云南民族大学学报（哲学社会科学版） 2024年第3期41卷 140-150页

作者：项松林孙悦安徽建筑大学公共管理学院安徽合肥230022 上海大学社会学院上海200444

新型城市建设是国家新型城镇化战略对于未来城市发展的规划与构想,加强新型城市建设是实现中国式城市现代化的重要任务。党的十八大以来,在相关政策推动下,新型城市建设历经“谋篇布局”“全面实施”“迭代升级”等不同阶段,在实践探索... 详细信息

新型城市建设是国家新型城镇化战略对于未来城市发展的规划与构想,加强新型城市建设是实现中国式城市现代化的重要任务。党的十八大以来,在相关政策推动下,新型城市建设历经“谋篇布局”“全面实施”“迭代升级”等不同阶段,在实践探索中不断突破与深化,取得了重要进展。客观地看,当前我国城市建设仍面临城市宜居性不高、城市韧性度不够、城市智慧化不足、城市创新力不强、城市生态化不优、城市人文性不全等问题。新征程上,继续推进新型城市建设,要更加注重以人为本,支撑人口规模巨大的城市现代化;更加注重动力变革,夯实全体人民共同富裕的城市现代化;更加注重品质内涵,推进物质文明与精神文明协调的城市现代化;更加注重绿色发展,促进人与自然和谐共生的城市现代化;更加注重发展方式,引领和平发展的城市现代化。

关键词：新型城市建设中国式现代化城市现代化城市形态

Using Copula functions to predict climatic change impacts on floods in river source regions

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Advances in Climate Change Research 2024年第3期15卷 406-418页

作者： Ting-Xing CHEN Hai-Shen LYU Robert HORTON Yong-Hua ZHU Ren-Sheng CHEN Ming-yue sun Ming-Wen LIU Yu LIN The National Key Laboratory of Water Disaster Prevention College of Hydrology and Water ResourcesHohai UniversityNanjing 2098China College of Hydrology and Water Resources Hohai UniversityNanjing 210098China Departmentof Agronomy lowa State UniversityAmes IA5oollUSA Qilian Alpine Eology and Hydrology Research Station Northwest Instiuteof Eco-Environmentand ReourcesChinese Academy of SciencesLanzhou0000 China

Flood frequency in river source regions is significantly affected by rainfall and snowmelt as part of climatic changes.A traditional univariate flood frequency analysis cannot reflect the complexity of floods,and when used in isolation,it can only underestimate flood *** effective flood prevention and mitigation,it is essential to consider the combined effects of precipitation and *** functions can effectively quantify the joint distribution relationship between floods and their associated variables without restrictions on their distribution *** study uses copula functions to consider a multivariate probability distribution model of flood peak flow(Q)with cumulative snowmelt(CSm)and cumulative precipitation(CPr)for the Hutubi River basin located in northern Xinjiang,*** joint frequencies of rainfall and snowmelt floods are predicted using copula models based on the Coupled Model Intercomparison Project Phase 6 *** results show that Q has a significant positive correlation with 24-d CSm(r=0.559,p=0.002)and 23-d CPr(r=0.965,p<0.05).Flood frequency will increase in the future,and mid-(2050e2074)and long-term(2075e2099)floods will be more severe than those in the near-term(2025e2049).The probability of flood occurrence is higher under the SSP2-4.5 and SSP1-2.6 scenarios than under *** during the historical period(1990e2014)led to extreme floods,and increasing future precipitation trends are found to be *** increases with rising temperatures and occurs earlier than estimated,leading to an earlier flood period in the basin and more frequent snowmelt *** Q under the joint return period is larger than that during the same univariate return *** difference indicates that neglecting the interaction between precipitation and snowmelt for floods leads to an underestimation of the flood risk(with underestimations ranging from 0.3%to 22%).The underestimations decrease with an increase

关键词： Climate change Flood frequency Copula CMIP6 River source regions

Coupling of Adhesion and Anti‑Freezing Properties in Hydrogel Electrolytes for Low‑Temperature Aqueous‑Based Hybrid Capacitors

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Nano-Micro Letters 2024年第2期16卷 15-31页

作者： Jingya Nan yue sun Fusheng Yang Yijing Zhang Yuxi Li Zihao Wang Chuchu Wang Dingkun Wang Fuxiang Chu Chunpeng Wang Tianyu Zhu Jianchun Jiang Institute of Chemical Industry of Forest Products Chinese Academy of ForestryKey Laboratory of Biomass Energy and MaterialJiangsu ProvinceNanjing 210042JiangsuPeople’s Republic of China Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Materials Science and Engineering Clemson UniversityClemsonSC 29634USA

Solid-state zinc-ion capacitors are emerging as promising candidates for large-scale energy storage owing to improved safety,mechanical and thermal stability and easy-to-direct *** electrolytes are appealing solid-state electrolytes because of eco-friendliness,high conductivity and intrinsic ***,the electrolyte/electrode interfacial contact and anti-freezing properties of current hydrogel electrolytes are still challenging for practical applications of zinc-ion ***,we report a class of hydrogel electrolytes that couple high interfacial adhesion and anti-freezing *** synergy of tough hydrogel matrix and chemical anchorage enables a well-adhered interface between hydrogel electrolyte and ***,the cooperative solvation of ZnCl2 and LiCl hybrid salts renders the hydrogel electrolyte high ionic conductivity and mechanical elasticity simultaneously at low *** significantly,the Zn||carbon nanotubes hybrid capacitor based on this hydrogel electrolyte exhibits low-temperature capacitive performance,delivering high-energy density of 39 Wh kg^(-1)at-60°C with capacity retention of 98.7%over 10,000 *** the benefits of the well-adhered electrolyte/electrode interface and the anti-freezing hydrogel electrolyte,the Zn/Li hybrid capacitor is able to accommodate dynamic deformations and function well under 1000 tension cycles even at-60°*** work provides a powerful strategy for enabling stable operation of low-temperature zinc-ion capacitors.

关键词： Interfacial adhesion Anti-freezing Hydrogel electrolytes Low-temperature hybrid capacitors Dynamic deformati

V0405 Dra:A New Deep and Low Mass Ratio Contact Binary with Extremely Fast Decrease in the Orbital Period

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Research in Astronomy and Astrophysics 2024年第6期24卷 287-293页

作者： Chao-yue Li Lin-Qiao Jiang Jie Zheng Yi-Man Liu Xiao-Yu Long Min sun Han-Lu Zhang Xiao-Man Tian School of Science Leshan Normal UniversityLeshan 614000China Center for Applied Optics Research Leshan Normal UniversityLeshan 614000China Key Laboratory of Detection and Application of Space Effect in Southwest Sichuan Leshan 614000China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Aeronautics Shandong Jiaotong UniversityJinan 250000China

V0405 Dra is a W UMa-type binary *** on the TESS data,we have conducted an orbital period study and performed a light curve analysis for the *** orbital period study reveals that the O-C curve for V0405 Dra exhibits secular decrease at an extremely high rate of d P/dt=-2.71×10^(-6)day year^(-1),along with periodic variations characterized by an amplitude of A_(3)=0.0032 day and a period of P_(3)=1.413 *** orbital periodic change is possibly due to the light-travel time effect resulting from an additional third body in the system,for which we estimate a minimum mass of M_(3)=0.77M_(⊙).By employing the 2013 version of the Wilson-Devinney(W-D)method to synthesize a light curve,we derived photometric solutions indicating that V0405 Dra is a new deep(f=68.7%)and low-mass ratio(q=0.175)contact *** fast decrease in its orbital period is likely caused by mass transfer from the more massive primary star to the less massive secondary star,or due to angular momentum *** further mass transfer and loss of angular momentum,the binary will gradually evolve into a tighter contact configuration,eventually leading to a merger into a single star,following the evolutionary paths suggested for such deep and low mass ratio contact binaries.

关键词： (stars:)binaries(including multiple):close (stars:)binaries:eclipsing stars:individual(V0405 Dra)

Surface diffraction beamline at the SSRF

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Nuclear Science and Techniques 2024年第7期35卷 47-57页

作者： yue-Liang Gu Xu Zheng Xing-Min Zhang Bin Zhao Guang-Zhi Yin Da-Ming Zhu Yuan-He sun Xing-Yu Gao Xiao-Long Li Shanghai Advanced Research Institute Chinese Academy of Sciences239 Zhangheng RoadPudong DistrictShanghai201204China

BL02U2 of the Shanghai Synchrotron Radiation Facility is a surface diffraction beamline with a photon flux of 5.5×10^(12) photons/s at 10 keV and a beam size of 160µm×80µm at the sample *** is dedicated to studying surfaces(solid-vacuum,solid-gas)and interfaces(solid-solid,solid-liquid,and liquid-liquid)in nanoscience,condensed matter,and soft matter systems using various surface scattering techniques over an energy range of 4.8-28 keV with transmission and reflection ***,BL02U2 has a high energy resolution,high angular resolution,and low beam divergence,which can provide excellent properties for X-ray diffraction experiments,such as grazing incident X-ray diffraction,X-ray reflectivity,crystal truncation rods,and liquid X-ray *** of in situ environments can also be provided for the samples *** paper describes the setup of the new beamline and its applications in various fields.

关键词： Surface and interface Beamline Surface diffraction Microstructure

作为方法的县域:县域城乡融合的逻辑、机理与路径

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深圳大学学报（人文社会科学版） 2024年第3期41卷 101-109页

作者：项松林孙悦安徽建筑大学公共管理学院安徽合肥230022 上海大学社会学院上海200444

以县域为关键切入点推进城乡融合发展,是新时代破解“三农”问题、推进乡村振兴、实现共同富裕的重要战略安排和方法举措,与“作为方法”的研究范式具有高度的契合性。将县域作为城乡融合的重要载体,既是乡村研究传统“向上提升”与城... 详细信息

以县域为关键切入点推进城乡融合发展,是新时代破解“三农”问题、推进乡村振兴、实现共同富裕的重要战略安排和方法举措,与“作为方法”的研究范式具有高度的契合性。将县域作为城乡融合的重要载体,既是乡村研究传统“向上提升”与城市研究传统“重心下沉”的逻辑使然,亦是其经济上的基础性、政治上的自主性、社会上的连通性、文化上的共通性等独特优势使然。从“要素-结构-体系”三位一体的内在机理看,县域是城乡要素融合的主阵地,是城乡结构融合的粘合剂,也是城乡体制机制融合的主渠道。针对现实中客观存在的城乡要素融合不顺畅、城乡结构融合不深入、城乡体制机制融合不健全等问题,应畅通资源要素流动自由化,推动城乡要素融合;提升农业产业体系现代化,促进城乡经济融合;推进基本公共服务均等化,加快城乡社会融合;加强新型城镇化与乡村振兴协同化,增进城乡空间融合;健全城乡体制机制一体化,夯实城乡制度融合。进入新发展阶段,必须坚持多措并举,推进县域城乡融合从“理念”转变为“理路”,从“想法”转变为“做法”。

关键词：城乡要素融合城乡结构融合城乡体制融合县域乡村振兴

Challenges and Suggestions of Ethical Review on Clinical Research Involving Brain-Computer Interfaces

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Chinese Medical Sciences Journal 2024年第2期39卷 131-139页

作者： Xue-Qin Wang Hong-Qiang sun Jia-yue Si Zi-Yan Lin Xiao-Mei Zhai Lin Lu Peking University Sixth Hospital Peking University Institute of Mental HealthNHC Key Laboratory of Mental Health(Peking University)National Clinical Research Center for Mental Disorders(Peking University Sixth Hospital)Chinese Academy of Medical Sciences Research Unit(No.2018RU006)Beijing 100191China Department of Psychology University of CaliforniaDavis 95616USA Department of Psychology University of TorontoToronto M5S 1A1Canada School of Population Medicine and Public Health Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Academy for Advanced Interdisciplinary Studies Peking-Tsinghua Centre for Life Sciences and Peking University-International Development Group/McGovern Institute for Brain ResearchPeking UniversityBeijing 100871China

Brain-computer interface(BCI)technology is rapidly advancing in medical research and *** an emerging biomedical engineering technology,it has garnered significant attention in the clinical research of brain disease diagnosis and treatment,neurological rehabilitation,and mental ***,BCI also raises several challenges and ethical concerns in clinical *** this article,the authors investigate and discuss three aspects of BCI in medicine and healthcare:the state of international ethical governance,multidimensional ethical challenges pertaining to BCI in clinical research,and suggestive concerns for ethical *** the great potential of frontier BCI research and development in the field of medical care,the ethical challenges induced by itself and the complexities of clinical research and brain function have put forward new special fields for ethics in *** ensure"responsible innovation"in BCI research in healthcare and medicine,the creation of an ethical global governance framework and system,along with special guidelines for cutting-edge BCI research in medicine,is suggested.

关键词： brain-computer interface clinical research bioethics ethical governance ethical review