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6th International Conference on Geo-informatics in Sustainable Ecosystem and Society, GSES 2018

作者： Sun, Yong Jin, Fengxiang Ji, Min Wang, Huimeng Li, Ting Geomatics College Shandong University of Science and Technology Qingdao266590 China Shandong Jianzhu University Jinian250101 China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Science and Natural Resources Research Chinese Academy of Sciences Beijing100000 China

ISBN: (纸本)9789811370243

To evaluate geological hazards in mines effectively and systematically, we proposed an object-oriented model base framework that realizes model management and model reuse. This framework supports model generation, data storage, operation, analysis, prediction and application and includes model building and model management. When building the model, 7 commonly used disaster assessment models are encapsulated as model classes and model instances that are represented as objects. Model management includes evaluation factor management, model addition, modification, deletion and so on. In addition, the framework makes full use of the spatial data processing capabilities of Geographic Information System (GIS) to perform spatial analysis and prediction. We also applied the framework to the serious exploitation area of a mine in the Fangshan District, beijing. The results showed that the proposed model base has strong operability and practical value and could provide early warnings for the geological hazards of coal mine areas. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Geographic information systems

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Inversion algorithm validation of 1.57-μm airborne double-pulse IPDA lidar for atmospheric CO2 measurement 9

Inversion algorithm validation of 1.57-μm airborne double-p...

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Optical Design and testing IX 2019

作者： Zhu, Yadan Zhu, Xiaopeng Bi, Decang Liu, Jiqiao Chen, Weibiao Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Laboratory of Space Laser Engineering Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (数字)9781510630888

ISBN: (纸本)9781510630871

Airborne integrated path differential absorption (IPDA) lidar system is an important instrument to verify the performance and data inversion methods of future space-borne lidar systems for atmospheric CO2 measurement. A ground vertical path validation experiment of atmospheric CO2 measurement by an airborne double-pulsed 1.57-μm IPDA lidar has been implemented. The experiment was carried out and temperature, pressure and humidity profiles of Local Meteorological Station at almost the same time are adopted. Backscattering signals from clouds at altitudes of nearly 5 km were received. To avoid the influence of stray light from mirrors, the energy monitoring signal was delayed through the 200 m multimode fiber. But it is interfered by the aerosol scattering echo signals. Inversely, considering the stray light as monitoring signal, the inversion result of XCO2 is pretty good. Six methods are studied and compared to reduce the bias and improve the CO2 column-averaged dry-air mixing ratio (XCO2) accuracy. The "PIM, AVD" and "PIM, AVX" methods are more effective when clouds are acted as hard target. The mean value of lidar measured XCO2 calculated by "PIM, AVD" and "PIM, AVX" methods is 409.63 ppm. The average value of in-situ instrument UGGA is 411.05 ppm over the same period. The bias between IPDA lidar and UGGA is -1.42 ppm. With averaging 148 shots, the standard deviation of XCO2 of the IPDA lidar system is 3.68 ppm. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Stray light

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Impact tensile cracking behavior of oxide scale in Q235 strip iron 2

Impact tensile cracking behavior of oxide scale in Q235 stri...

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2nd International Conference on Material Engineering and Advanced Manufacturing technology, MEAMT 2018

作者： Wang, Shang Li, Wenpei Wang, Xiaochen Ai, Rui Yang, Quan Shan, Zhongde Institute of Engineering Technology University of Science and Technology Beijing Beijing100083 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing100083 China

Scanning electron microscopy (SEM) is used to observe the fracture surface morphology of Q235 steel. The cracking law/crack rule principle of strip surface under tension is studied via universal tensile testing machine. The results show that the thickness of the scale is relatively uniform, about 10 μm, and the structure is dense and well attached to the matrix. Tensile experiments show that as the strain increases, the cracks increase slowly in the initial stage, rapidly in the middle period, and slowly in the final period. When the strain exceeds 0.15%, the cracks are difficult to increase. In order to avoid direct erosion of the abrasive on the substrate, a reasonable range of tension setting should be 0.15%-0.18% in the pretreatment process without acid descaling. © 2018 The Authors, published by EDP sciences.

关键词： Tensile testing

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sCompile: Critical Path Identification and analysis for Smart Contracts 21st

sCompile: Critical Path Identification and Analysis for Smar...

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21st International Conference on Formal Engineering Methods, ICFEM 2019

作者： Chang, Jialiang Gao, Bo Xiao, Hao Sun, Jun Cai, Yan Yang, Zijiang Department of Computer Science Western Michigan University KalamazooMI49009 United States Pillar of Information System Technology and Design Singapore University of Technology and Design Singapore Singapore School of Information Systems Singapore Management University Singapore Singapore State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (纸本)9783030324087

Ethereum smart contracts are an innovation built on top of the blockchain technology, which provides a platform for automatically executing contracts in an anonymous, distributed, and trusted way. The problem is magnified by the fact that smart contracts, unlike ordinary programs, cannot be patched easily once deployed. It is important for smart contracts to be checked against potential vulnerabilities. In this work, we propose an alternative approach to automatically identify critical program paths (with multiple function calls including inter-contract function calls) in a smart contract, rank the paths according to their criticalness, discard them if they are infeasible or otherwise present them with user friendly warnings for user inspection. We identify paths which involve monetary transaction as critical paths, and prioritize those which potentially violate important properties. For scalability, symbolic execution techniques are only applied to top ranked critical paths. Our approach has been implemented in a tool called sCompile, which has been applied to 36,099 smart contracts. The experiment results show that sCompile is efficient, i.e., 5 s on average for one smart contract. Furthermore, we show that many known vulnerabilities can be captured if user inspects as few as 10 program paths generated by sCompile. Lastly, sCompile discovered 224 unknown vulnerabilities with a false positive rate of 15.4% before user inspection. © 2019, Springer Nature Switzerland AG.

关键词： Smart contract

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The de Haas-van Alphen quantum oscillations in a three-dimensional Dirac semimetal TiSb2

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Applied Physics Letters 2020年第14期116卷 142103-142103页

作者： Xia, Wei Shi, Xianbiao Wang, Yushu Ge, Wenna Su, Hao Wang, Qin Wang, Xia Yu, Na Zou, Zhiqiang Hao, Yufeng Zhao, Weiwei Guo, Yanfeng School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Shenzhen518055 China Flexible Printed Electronic Technology Center Harbin Institute of Technology Shenzhen518055 China National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Haian Institute of New Technology Nanjing University Haian226600 China School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan450001 China

Characterization of the Fermi surface of high-quality crystalline TiSb2 by de Haas-van Alphen measurement reveals nontrivial topological properties. Moreover, our analysis of the quantum oscillation frequencies associated with nonzero Berry phase when the magnetic field is parallel to both the ab-plane and c-axis of TiSb2 finds that the Fermi surface topology has a three-dimensional feature. The results are supported by first-principle calculations which reveal a symmetry-protected Dirac point along the Γ-Z high symmetry line near the Fermi level. On the (001) surface, the bulk Dirac points are found to project onto the Γ ¯ point with nontrivial surface states. Our finding will substantially enrich the family of 3D Dirac semimetals which are useful for topological applications. © 2020 Author(s).

关键词： Topology

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Constraining self-interacting dark matter with the full dataset of PandaX-II

arXiv

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arXiv 2021年

作者： Yang, Jijun Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cheng, Chen Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Fu, Mengting Geng, Lisheng Giboni, Karl Gu, Linhui Guo, Xuyuan Han, Ke He, Changda He, Shengming Huang, Di Huang, Yan Huo, Ran Huang, Yanlin Huang, Zhou Ji, Xiangdong Ju, Yonglin Li, Shuaijie Lin, Qing Liu, Huaxuan Liu, Jianglai Lu, Xiaoying Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Shaheed, Nasir Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Shen, Guofang Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, QiuHong Wang, Siguang Wang, Wei Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Wu, Weihao Xia, Jingkai Xiao, Mengjiao Xiao, Xiang Xie, Pengwei Yan, Binbin Yang, Yong Yu, Chunxu Yu, Hai-Bo Yuan, Jumin Yuan, Ying Zeng, Xinning Zhang, Dan Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng School of Physics and Astronomy Shanghai Jiao Tong University MOE Key Laboratory for Particle Astrophysics and Cosmology Shanghai Key Laboratory for article Physics and Cosmology Shanghai200240 China Shanghai Jiao Tong University Sichuan Research Institude Chengdu610213 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu610051 China School of Physics Sun Yat-Sen University Gaungzhou510275 China Tsung-Dao Lee Institute Shanghai200240 China School of Physics Nankai University Tianjin300071 China Institute of Modern Physics Fudan University Shanghai200433 China School of Physics Peking University Beijing100871 China School of Physics Beihang University Beijing100191 China International Research Center for Nuclei and Particles in the Cosmos Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing100191 China Shandong Institute of Advanced Technology Jinan250103 China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai200093 China Department of Physics University of Maryland College ParkMD20742 United States School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Department of Modern Physics University of Science and Technology of China Hefei230026 China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Jinan250100 China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary Scienc Shandong University Shandong Qingdao266237 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China Department of Physics and Astronomy University of California RiversideCA92507 United States Center of High Energy Physics Peking University Beijing100871 C

Self-interacting Dark Matter (SIDM) is a leading candidate proposed to solve discrepancies between predictions of the prevailing cold dark matter theory and observations of galaxies. Many SIDM models predict the existence of a light force carrier that mediate strong dark matter self-interactions. If the mediator couples to the standard model particles, it could produce characteristic signals in dark matter direct detection experiments. We report searches for SIDM models with a light mediator using the full dataset of the PandaX-II experiment, based on a total exposure of 132 tonne-days. No significant excess over background is found, and our likelihood analysis leads to a strong upper limit on the dark matter-nucleon coupling strength. We further combine the PandaX-II constraints and those from observations of the light element abundances in the early universe, and show that direct detection and cosmological probes can provide complementary constraints on dark matter models with a light mediator. © 2021, CC BY-NC-ND.

关键词： Dark Matter

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Secondary-Bond-Driven Construction of a Polar Material Exhibiting Strong Broad-Spectrum Second-Harmonic Generation and Large Birefringence

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Angewandte Chemie 2023年第10期136卷

作者： Dr. Tianhui Wu Dr. Xingxing Jiang Dr. Kaining Duanmu Dr. Chao Wu Prof. Zheshuai Lin Prof. Zhipeng Huang Prof. Mark G. Humphrey Prof. Chi Zhang China-Australia Joint Research Center for Functional Molecular Materials School of Materials Science and Engineering Ocean University of China Qingdao 266404 China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Applied Chemistry Yanshan University Qinhuangdao 066004 China School of Chemical Science and Engineering Tongji University Shanghai 200092 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Research School of Chemistry Australian National University Canberra ACT 2601 Australia

Considerable effort has been invested in the development of non-centrosymmetric (NCS) inorganic solids for ferroelectricity-, piezoelectricity- and, particularly, optical nonlinearity-related applications. While great progress has been made, a persistent problem is the difficulty in constructing NCS materials, which probably stems from non-directionality and unsaturation of the ionic bonds between metal counter-cations and covalent anionic modules. We report herein a secondary-bond-driven approach that circumvents the cancellation of dipole moments between adjacent anionic modules that has plagued second-harmonic generation (SHG) material design, and which thereby affords a polar structure with strong SHG properties. The resultant first NCS counter-cation-free iodate, VO 2 (H 2 O)(IO 3 ) (VIO), a new class of iodate, crystallizes in a polar lattice with VO 2 (H 2 O)(IO 3 )] zigzag chains connected by weak hydrogen bonds and intermolecular forces. VIO exhibits very large SHG responses (18 × KH 2 PO 4 @ 1200 nm, 1.5 × KTiOPO 4 @ 2100 nm) and sufficient birefringence (0.184 @ 546 nm). Calculations and crystal structure analysis attribute the large SHG responses to consistent polarization orientations of the VO 2 (H 2 O)(IO 3 )] chains controlled by secondary bonds. This study highlights the advantages of manipulating the secondary bonds in inorganic solids to control NCS structure and optical nonlinearity, affording a new perspective in the development of high-performance NLO materials.

关键词： Birefringence Iodate Second-Harmonic Generation Secondary Bond Structure-Property Relationships

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Unpaired 3d Electrons on Atomically Dispersed Cobalt Centres in Coordination Polymers Regulate both Oxygen Reduction Reaction (ORR) Activity and Selectivity for Use in Zinc–Air Batteries

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Advanced Materials 2020年第1期59卷 292-300页

作者： Lian, Yuebin Yang, Wenjuan Zhang, Chufeng Sun, Hao Deng, Zhao Xu, Wenjie Song, Li Ouyang, Zhongwen Wang, Zhenxing Guo, Jun Peng, Yang Soochow Institute of Energy and Material Innovations College of Physics Optoelectronics and Energy Soochow University Suzhou215006 China Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Soochow University Suzhou215006 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China National Synchrotron Radiation Laboratory CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui230029 China Wuhan National High Magnetic Field Center & School of Physics Huazhong University of Science and Technology Wuhan430074 China Analysis and Testing Center Soochow University Suzhou215123 China

Reversible oxygen conversion is important for various green energy technologies. Herein we synthesize a series of bimetallic coordination polymers by varying the Ni/Co ratio and using HITP (HITP=2,3,6,7,10,11-hexaiminotriphenylene) as the ligand, to interrogate the role of metal centres in modulating the activity of the oxygen reduction reaction (ORR). Co3HITP2 and Ni3HITP2 are compared. Unpaired 3d electrons in Co3HITP2 result in less coplanarity but more radical character. Thus, despite of a reduced crystallinity and conductivity, the best ORR activity, comparable to 20% Pt/C, is obtained for Co3HITP2, showing the 3d orbital configuration of the metal centre promotes ORR. Experimental and DFT studies show a transition of ORR pathway from four-electron for Co3HITP2 to two-electron for Ni3HITP2. Rechargeable zinc–air batteries using Co3HITP2 as the air cathode catalyst demonstrate excellent energy efficiency and stability. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Oxygen

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Discovery of carbon-based strongest and hardest amorphous material

arXiv

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arXiv 2020年

作者： Zhang, Shuangshuang Li, Zihe Luo, Kun He, Julong Gao, Yufei Soldatov, Alexander V. Benavides, Vicente Shi, Kaiyuan Nie, Anmin Zhang, Bin Hu, Wentao Ma, Mengdong Liu, Yong Wen, Bin Gao, Guoying Liu, Bing Zhang, Yang Shu, Yu Yu, Dongli Zhou, Xiang-Feng Zhao, Zhisheng Xu, Bo Su, Lei Yang, Guoqiang Chernogorova, Olga P. Tian, Yongjun State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Hebei Key Laboratory of Microstructural Material Physics School of Science Yanshan University Qinhuangdao066004 China Department of Engineering Sciences and Mathematics Luleå University of Technology LuleåSE-97187 Sweden Department of Physics Harvard University CambridgeMA02138 United States Center for High Pressure Science and Technology Advanced Research Shanghai201203 China Department of Materials Science Saarland University Campus D3.3 SaarbrückenD-66123 Germany Key Laboratory of Photochemistry Institute of Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100190 China Baikov Institute of Metallurgy and Materials Science Moscow119334 Russia

Carbon is likely the most fascinating element because of the diversity of its allotropes stemming from its variable (sp, sp2, and sp3) bonding motifs. Exploration of new carbon forms has been an eternal theme of contemporary scientific research. Here we report on novel amorphous (AM) carbon materials containing high fraction of sp3-bonded atoms recovered after compressing fullerene C60 to previously unexplored high pressure and high temperature. analysis of photoluminescence and absorption spectra demonstrates that they are semiconductors with tunable bandgaps in the range of 1.5-2.2 eV, comparable to that of amorphous silicon. The synthesized AM-III carbon is the hardest and strongest amorphous material known to date, capable of scratching diamond crystal and approaching its strength which is evidenced by complimentary mechanical tests. The remarkable combination of outstanding mechanical and electronic properties makes these AM carbon materials an excellent candidate for photovoltaic applications demanding ultrahigh strength and wear resistance. © 2020, CC BY.

关键词： Electronic properties

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The climate opportunities and risks of improving building envelopes across 1,677 Chinese cities

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Cell Reports Sustainability 2024年第12期1卷

作者： Zhang, Yufei Dang, Mengyuan Chu, Chunli Behrens, Paul Berrill, Peter Zhong, Xiaoyang Jing, Rui Lei, Nuoa Jia, Hongyuan Zhang, Lixiao Shao, Chaofeng Masanet, Eric Ju, Meiting Liu, Lirong Chen, Weiqiang Cao, Zhi College of Environmental Science and Engineering Nankai University 38 Tongyan Road Jinnan District Tianjin 300350 China Institute of Environmental Sciences (CML) Leiden University RA Leiden Leiden 2300 Netherlands Oxford Martin School University of Oxford 34 Broad Street Oxford OX1 3BD United Kingdom Sustainability Economics of Human Settlements Technische Universität Berlin Fasanenstr. 88 Berlin 10623 Germany Mercator Research Institute on Global Commons and Climate Change Berlin 10829 Germany International Institute of Applied Systems Analysis (IIASA) Schlossplatz 1 Laxenburg 2361 Austria College of Energy Xiamen University Xiamen 361005 China Energy Technologies Area Lawrence Berkeley National Laboratory Berkeley 94720 CA United States School of Civil Engineering and Architecture Chongqing University of Science and Technology Chongqing 401331 China SinBerBEST Berkeley Education Alliance for Research in Singapore Singapore 138602 Singapore State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Bren School of Environmental Science and Management University of California Santa Barbara 93106 CA United States Department of Mechanical Engineering University of California Santa Barbara 93106 CA United States Centre for Environment and Sustainability University of Surrey Guildford GU2 7XH United Kingdom Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China

The global building sector consumes approximately 30% of final energy, making it crucial for climate change mitigation and adaptation. International calls for enhancing building energy efficiencies are growing, focusing on strategies such as energy-efficient building envelopes through renovation and replacement of older structures, along with electrification and fuel switching. However, the energy-saving potential of these improvements remains uncertain due to the complex interplay of building stock characteristics and climatic conditions. Here, we diagnose the compound effects of envelope improvements and climate change on China's housing energy demand using a physics-based building energy model with fine spatial and temporal granularity, covering 1,677 sub-province-level cities. Our model shows that envelope improvements play very different roles in ameliorating climate change impacts on housing energy use across the country, highlighting the need for building climate-resilient energy supply and pursuing alternative energy efficiency strategies in less climate-resilient regions. © 2024 The Authors

关键词： building energy building envelopes climate change cooling demand heating demand stock dynamics surrogate modeling

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