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Landslide susceptibility mapping using hybrid random forest with GeoDetector and RFE for factor optimization

Geoscience Frontiers 2021年第5期12卷 355-373页

作者： Xinzhi Zhou Haijia Wen Yalan zhang Jiahui Xu Wengang zhang School of Civil Engineering Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Ministry of EducationChongqing UniversityChongqing 400045China Key Laboratory of GIS Application Research Chongqing Normal UniversityChongqing 401331China

The present study aims to develop two hybrid models to optimize the factors and enhance the predictive ability of the landslide susceptibility *** this,a landslide inventory map was created with 406 historical landslides and 2030 non-landslide points,which was randomly divided into two datasets for model training(70%)and model testing(30%).22 factors were initially selected to establish a landslide factor *** applied the GeoDetector and recursive feature elimination method(RFE)to address factor optimization to reduce information redundancy and collinearity in the ***,the frequency ratio method,multicollinearity test,and interactive detector were used to analyze and evaluate the optimized ***,the random forest(RF)model was used to create a landslide susceptibility map with original and optimized *** resultant hybrid models GeoDetector-RF and RFE-RF were evaluated and compared by the area under the receiver operating characteristic curve(AUC)and *** accuracy of the two hybrid models(0.868 for GeoDetector-RF and 0.869 for RFE-RF)were higher than that of the RF model(0.860),indicating that the hybrid models with factor optimization have high reliability and *** RFE-RF GeoDetector-RF had higher AUC values,respectively 0.863 and 0.860,than RF(0.853).These results confirm the ability of factor optimization methods to improve the performance of landslide susceptibility models.

关键词： Landslide susceptibility mapping GeoDetector Recursive feature elimination Random forest Factor optimization

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On the decidability of open logic

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Science in China(Series F) 2009年第8期52卷 1283-1291页

作者： zhang Wei Northeastern University Neusoft Institute of Information Dalian 116023 China

Open logic （OL） is a noticeable logic theory dealing with the description of knowledge growth and updating, as well as the evolution of hypothesis. Up to now, however, many problems related to the proof theoretical approach of OL remain to be explored. In this paper, the typical proof theoretical problems for OL are described and the concept of open proof is defined. Two major conclusions are as follows：（i） For the consistent OL systems, the open proof problem is semi-decidable （a decision algorithm is presented）. （ii） For general （normal, not necessarily consistent） OL systems, the open proof problem is not semi-decidable.

关键词： open logic epistemic process decidability

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Almost periodic oscillations in a generalized Mackey-Glass model of respiratory dynamics with several delays

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International Journal of Biomathematics 2014年第3期7卷 97-118页

作者： Tianwei zhang City College Kunming University of Science and Technology Kunming 650051 P. R. China

By using some analytical techniques, modified inequalities and Mawhin＇s continuous theorem of coincidence degree theory, some simple sufficient conditions for the existence of at least one positive almost periodic solution of a generalized Mackey-Glass model of respiratory dynamics are obtained. Further, the globM attractivity of positive almost periodic solution of the above model is also studied. To the best of the author＇s knowl- edge, so far, the result of this paper is completely new. Finally, three examples are given to illustrate the main results in this paper.

关键词： Almost periodic oscillation coincidence degree Mackey-Glass respiratorydynamics.

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A quasi-solid-state electrolyte with high ionic conductivity for stable lithium-ion batteries

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Science China(Technological Sciences) 2022年第10期65卷 2369-2379页

作者： zhang WenJing LI SenLin zhang YuRong WANG XingHui LIU JingDong ZHENG YuanHui College of Chemistry Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated MaterialsFuzhou UniversityFuzhou 350108China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

The practical applications of solid-state electrolytes in lithium-ion batteries(LIBs)are hindered by their low ionic conductivity and high interfacial ***,an ethoxylated trimethylolpropane triacrylate based quasi-solid-state electrolyte(ETPTAQSSE)with a three-dimensional(3D)network is prepared by a one-step in-situ photopolymerization *** 3D network is designed to overcome the contradiction between the plasticizer-related ionic conductivity and the thickness-dependent mechanical property of quasi-solid-state *** ETPTA-QSSE achieves superb room-temperature ionic conductivity up to 4.55×10^(−3)S cm^(−1),a high lithium ion transference number of 0.57,along with a wide electrochemical window of 5.3 V(***+/Li),which outperforms most ever of the reported solid-state *** to the robust network structure and the cathodeelectrolyte integrated electrode design,Li metal symmetrical cells show reduced interface resistance and reinforced electrode/electrolyte interface *** applying the ETPTA-QSSE in LiFePO_(4)||Li cells,the quasi-solid-state cell demonstrates an enhanced initial discharge capacity(155.5 mAh g^(−1)at 0.2 C)accompanied by a high average Coulombic efficiency of greater than 99.3%,offering capacity retention of 92%after 200 ***,this work sheds light on the strategy of enhancing ionic conductivity and reducing interfacial resistance of quasi-solid-state electrolytes,which is promising for high-voltage LIBs.

关键词： quasi-solid-state electrolyte ionic conductivity electrochemical window photopolymerization lithium-ion batteries

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Self-cleaning SERS sensor based on flexible Ni_(3)S_(2)/MoS_(2)@Ag@PDMS composites for label-free multiplex volatile organic compounds detection

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Nano Research 2024年第6期17卷 5529-5539页

作者： Xinyue Song Yongzheng zhang Xiaohui Ren Dongyan Tang Xuelin zhang Xin Li MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringState Key Lab of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150090China College of Textile and Clothing Yancheng Institute of TechnologyYancheng 224051China MEMS Center Harbin Institute of TechnologyHarbin 150001China

Flexible self-cleaning surface-enhanced Raman scattering(SERS)sensors are highly desirable for the detection of various environmental pollutants,including volatile organic compounds(VOCs).However,achieving sensitive detection without labeling and ensuring efficient cyclic use remain significant ***,we introduce a direct approach to create a versatile Ni_(3)S_(2)/MoS_(2)@Ag@PDMS(PDMS=polydimethylsiloxane)composite SERS substrate using chemical vapor deposition *** produced substrate shows outstanding performance,offering extremely low detection sensitivity(1.0×10^(−12)M 4-aminobenzenethiol)and high enhancement factors(approximately 107).The interactions between the rod-shaped Ni_(3)S_(2)/MoS_(2)@Ag heterostructure and the molecules facilitate the transfer of charge,resulting in an increased electric field enhancement of the exciton *** has the dual benefit of providing a self-cleaning effect and enhancing SERS ***,the substrate enables sensitive detection of VOCs gas molecules without the need for labels,achieving a minimum detectable concentration as low as 1 ppm for o-dichlorobenzene,due to the preconcentration effect of *** calculations further explain the combined effect of electromagnetic and chemical enhancement in this composite *** utilizing the developed visual SERS barcode,quick multiple detection and analysis of mixtures can be *** flexible and versatile SERS technique has significant potential for on-site detection and analysis of environmental pollutants,opening the doors for the development of a wearable in-situ SERS sensing platform.

关键词： surface-enhanced Raman scattering(SERS) quantitative detection recyclable detection volatile organic compounds(VOCs) chemical vapor deposition(CVD)

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COATS:Comprehensive observation on the atmospheric boundary layer three-dimensional structure during haze pollution in the North China Plain

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Science China Earth Sciences 2023年第5期66卷 939-958页

作者： Qianhui LI Hongsheng zhang Xiaoye zhang Xuhui CAI Xipeng JIN Lu zhang Yu SONG Ling KANG Fei HU Tong ZHU Tianjin Key Laboratory for Oceanic Meteorology Tianjin Meteorological Service CenterTianjin Meteorological BureauTianjin 300074China Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesChina Meteorological Administration(CMA)Beijing 100081China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The North China Plain(NCP)is troubled by severe haze pollution and the evolution of haze pollution is closely related to the atmospheric boundary layer(ABL).However,experimental and theoretical studies on the physical-chemical processes of the ABL in the NCP are lacking,with many scientific problems to be *** solve these problems,the Comprehensive Observation on the Atmospheric boundary layer Three-dimensional Structure(COATS)during haze pollution was carried out in the NCP from 2016 to *** COATS experiment adopted a"point-line-surface"spatial layout,obtaining both spatial-temporal profiles of the meteorological and environmental elements in the ABL and the turbulent transport data of fine particulate matter(PM_(2.5))in winter and *** research achievements are as *** spatial-temporal distribution characteristics of the ABL structure and PM_(2.5)concentrations in NCP were *** typical thermal structure of persistent heavy haze events and the pollutant removal mechanism by low-level jets were *** was determined that the spatial structure of the ABL adjusted by the Taihang Mountains is responsible for the heterogeneous distribution of haze pollution in the NCP,and that mountain-induced vertical circulations can promote the formation of elevated pollution *** restraints of the atmospheric internal boundaries on horizontal diffusion of pollutants were *** contribution of the ABL to haze pollution in winter and summer was qualitatively compared and quantitatively *** turbulent transport nature behind the relationship between the atmospheric boundary layer height(ABLH)and surface PM_(2.5)concentrations was *** concept of"aerosol accumulation layer"was defined,and the applicability of the material method in determining ABLH was clarified.A measurement system for obtaining the turbulent flux of PM_(2.5)concentrations was developed,and the turbulence characteristics of PM_(2.5)concentrations w

关键词： COATS experiment Haze pollution ABL three-dimensional structure Aerosol accumulation layer Turbulent flux of PM_(2.5)concentrations North China Plain

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Commercial Application of Novel Heavy Oil Catalytic Cracking Catalyst HSC

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China Petroleum Processing & Petrochemical Technology 2017年第1期19卷 11-18页

作者： zhang Zhimin Qilu Branch of SINOPEC Catalyst Co. LTD Zibo 255336

The commercial application of a novel RFCC catalyst HSC used in an 1.4 Mt/a RFCC unit at a refinery A was introduced. The application results show that in comparison with the base catalyst, the yield of dry gas and slurry was reduced, while the total liquid yield, gasoline yield and LPG yield increased by 1.34, 5.05 and 1.43 percentage points,respectively. The properties of the products showed no significant change while the anti-abrasion strength of the catalyst was relatively high. Based on the mid-term calibration test, the summary calibration test and the daily statistics of long term industrial application practice, the HSC catalyst features a strong conversion ability of heavy oil, a high gasoline yield, a satisfactory product distribution and a good selectivity.

关键词： heavy oil FCC catalyst industrial application structural stability

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Rational Solutions of High-Order Algebraic Ordinary Differential Equations

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Journal of Systems Science & Complexity 2020年第3期33卷 821-835页

作者： VO Thieu N. zhang Yi Fractional Calculus Optimization and Algebra Research GroupFaculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Johann Radon Institute for Computational and Applied Mathematics(RICAM) Austrian Academy of SciencesAustria Department of Mathematical Sciences The University of Texas at Dallas(UTD)USA

This paper considers algebraic ordinary differential equations(AODEs)and study their polynomial and rational *** authors first prove a sufficient condition for the existence of a bound on the degree of the possible polynomial solutions to an *** AODE satisfying this condition is called *** the authors prove that some common classes of low-order AODEs are *** rational solutions,the authors determine a class of AODEs,which are called maximally comparable,such that the possible poles of any rational solutions are recognizable from their *** generalizes the well-known fact that any pole of rational solutions to a linear ODE is contained in the set of zeros of its leading ***,the authors develop an algorithm to compute all rational solutions of certain maximally comparable AODEs,which is applicable to 78.54%of the AODEs in Kamke's collection of standard differential equations.

关键词： Algebraic ordinary differential equations algorithms polynomial solutions rational solutions

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A route for large-scale preparation of multifunctional superhydrophobic coating with electrochemically-modified kaolin for efficient corrosion protection of magnesium alloys

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Journal of Magnesium and Alloys 2022年第11期10卷 3082-3099页

作者： Xiang Liu Tian C.zhang Yuxin zhang Jinsong Rao Shaojun Yuan Low-carbon Technology&Chemical Reaction Engineering Lab College of Chemical EngineeringSichuan UniversityChengdu 610065China Civil&Environmental Engineering Department University of Nebraska-LincolnOmahaNE 68182-0178USA State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

Superhydrophobic coating has been widely studied for its great applicational potential, such as for corrosion protection of magnesium alloys while it has been restrained by expensive materials, sophisticated preparation process and infirm rough structures. In this study, the electrochemical method was adopted by using a two-electrode system for rapid hydrophobic modification to obtain superhydrophobic *** mixing the modified superhydrophobic kaolin with commercial epoxy resin and polydimethylsiloxane glue, a paint can be formed and easily used on various substrates for preparation of superhydrophobic coating via spraying method. The influence factors on wettability of the modified kaolin and the mixing ratio of each component of the coating were explored. Also, the wettability, durability and anticorrosion of the prepared coating were evaluated comprehensively. The coating was able to maintain superhydrophobic after immersed in HCl solution at pH 1, the NaOH solution at pH 14, and 3.5 wt.% NaCl solution for 16, 21, 30 days, respectively. In addition, the coating exhibited 4A grade adhesion, high hydrophobicity after abraded for 200 cycles on a 600-mesh sandpaper with 100 g weight, and 99.86% anticorrosion efficiency after soaked in 3.5 wt.% NaCl solution for 20 days, demonstrating a good robustness and anti-corrosion property. Furthermore, the coating showed good transparency, flexibility and was easy to make in a large scale by the spraying method, which is of great significance to promote the practical application of superhydrophobic coatings and the anticorrosion Mg alloys.

关键词： Superhydrophobic coating Large-scale application Magnesium alloys Corrosion protection

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Octupole corner state in a three-dimensional topological circuit

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Light(Science & Applications) 2020年第1期9卷 618-626页

作者： Shuo Liu Shaojie Ma Qian zhang Lei zhang Cheng Yang Oubo You Wenlong Gao Yuanjiang Xiang Tie Jun Cui Shuang zhang Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen University518060 ShenzhenChina School of Physics and Astronomy University of BirminghamBirmingham B152TTUK State Key Laboratory of Millimeter Waves Southeast University210096 NanjingChina School of Physics and Electronics Hunan University410082 ChangshaChina

Higher-order topological insulators(HOTIs)represent a new family of topological materials featuring quantized bulk polarizations and zero-dimensional corner *** recent years,zero-dimensional corner states have been demonstrated in two-dimensional systems in the form of quadrupole modes or dipole *** to the challenges in designing and constructing three-dimensional systems,octupole corner modes in 3D have not been *** this work,we experimentally investigate octupole topological phases in a three-dimensional electrical circuit,which can be viewed as a cubic lattice version of the Hofstadter model with aπ-flux threading each *** experimentally observe in our higher-order topological circuit a 0D corner state manifested as a localized impedance *** observed corner state in the electrical circuit is induced by the octupole moment of the bulk circuit and is topologically protected by anticommuting spatial symmetries of the circuit *** work provides a platform for investigating higher-order topological effects in three-dimensional electrical circuits.

关键词： topological state electrical

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