检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 337-350页

作者： Jingou Kuang zhilin Long School of Civil Engineering Xiangtan UniversityXiangtan 411105China

This work constructed a machine learning(ML)model to predict the atmospheric corrosion rate of low-alloy steels(LAS).The material properties of LAS,environmental factors,and exposure time were used as the input,while the corrosion rate as the output.6 dif-ferent ML algorithms were used to construct the proposed *** optimization and filtering,the eXtreme gradient boosting(XG-Boost)model exhibited good corrosion rate prediction *** features of material properties were then transformed into atomic and physical features using the proposed property transformation approach,and the dominant descriptors that affected the corrosion rate were filtered using the recursive feature elimination(RFE)as well as XGBoost *** established ML models exhibited better predic-tion performance and generalization ability via property transformation *** addition,the SHapley additive exPlanations(SHAP)method was applied to analyze the relationship between the descriptors and corrosion *** results showed that the property transformation model could effectively help with analyzing the corrosion behavior,thereby significantly improving the generalization ability of corrosion rate prediction models.

关键词： machine learning low-alloy steel atmospheric corrosion prediction corrosion rate feature fusion

Suppressing the phase transition of ZrP_(2.O_(7), by defect and entropy regulation for high-temperature wave-transparent material application

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第8期13卷 1164-1177页

作者： Peng Liu zhilin Tian zhilin Chen Shuping Wen Liya Zheng Bin Li School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China

ZrP_(2.O_(7) is a promising wave-transparent material due to its low dielectric constant and low dielectric loss,but its inherent phase transition characteristic at approximately 300℃ limits its high-temperature ***,suppressing the phase transition is necessary for ZrP_(2.O_(7),to serve in extremely harsh *** this work,introducing Ti and Hf into ZrP_(2.O_(7) causes significant lattice distortion and an increase in entropy,both of which synergistically limit the crystal structure *** addition,enhanced phonon scattering by mismatch of atomic mass and local distortion leads to a reduction in the thermal *** distortions also cause changes in both bond length and tilting angle,so that(Ti_(1/3)Zr_(1/3)Hf_(1/3))P_(2.O_(7) does not undergo sudden expansion as does ZrP_(2.O_(7).(Ti_(1/3)Zr_(1/3)Hf_(1/3))ZrP_(2.O_(7) maintains excellent dielectric properties,which highlights it as a promising high-temperature wave-transparent material.

关键词： wave-transparent material medium-entropy ceramics phase transition dielectric constant thermal expansion thermal conductivity

Theoretical and numerical research on the dynamic launch response of carbon fiber composite cartridges

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 426-436页

作者： Ruijie Zhang Hui Xu Chenlei Huang Kun Liu zhilin Wu School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina

Understanding the dynamic response of composite material cartridges during the firing process is of great significance for improving their reliability and safety.A theoretical model describing the dynamic response of composite material cartridges is established based on the thick-walled cylinder theory and rate-dependent constitutive model of composite *** correctness of the theoretical model is validated through finite element simulations of cartridge *** influence of chamber pressure and cartridge wall thickness on the cartridge's deformation process and stress distribution is *** results indicate that the primary deformation of composite material cartridges inside the chamber is elastic *** to metal cartridges,composite material cartridges require higher pressure for touching-chamber and are more prone to developing gaps after unloading to ensure smooth *** the deformation process,the touching-chamber behavior of the cartridge can improve the stress *** the same chamber pressure,the touching-chamber behavior can reduce the circumferential stress by approximately 30%.The inner wall surface of the cartridge is a critical area that requires *** touching-chamber behavior can be facilitated by appropriately reducing the cartridge wall thickness while ensuring overall *** study can provide guidance for the optimization design of composite material cartridges.

关键词： Composite material cartridges Dynamic response Thick-walled cylinder theory Finite element simulation Toughing-chamber behavior

A Stable FE-FD Method for Anisotropic Parabolic PDEs with Moving Interfaces

在线全文

学校读者我要写书评

暂无评论

Communications on Applied Mathematics and Computation 2024年第2期6卷 992-1012页

作者： Baiying Dong zhilin Li Juan Ruiz-Alvarez School of Civil and Hydraulic Engineering NingXia UniversityYinchuan 750021NingxiaChina School of Mathematics and Computer Science NingXia Normal UniversityGuyuan 756000NingxiaChina Department of Mathematics North Carolina State UniversityRaleighNC 27695-8205USA Departamento de Matematica Aplicada y Estadistica Universidad Politecnica de CartagenaCartagenaSpain

In this paper,a new finite element and finite difference(FE-FD)method has been developed for anisotropic parabolic interface problems with a known moving interface using Cartesian *** the spatial discretization,the standard P,FE discretization is applied so that the part of the coefficient matrix is symmetric positive definite,while near the interface,the maximum principle preserving immersed interface discretization is *** the time discretization,a modified Crank-Nicolson discretization is employed so that the hybrid FE-FD is stable and second order *** terms are needed when the interface crosses grid *** moving interface is represented by the zero level set of a Lipschitz continuous *** experiments presented in this paper confirm second orderconvergence.

关键词： Anisotropic parabolic interface problem Hybrid finite element and finite difference(FE-FD)discretization Modified Crank Nicolson scheme

The relationship between interannual dry/wet changes and nomadic wars in the Hexi Corridor region of China during the period 2.1–1912.A.D.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第6期67卷 1922-1931页

作者： Fei TANG zhilin SHI Qinhua TIAN Xiaogang DU Yong ZHANG Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Institute of Dunhuang Studies Lanzhou UniversityLanzhou 730020China National Climate Center China Meteorological AdministrationBeijing 100081China Longchanghe Station Gansu Qilian Mountain National Nature ReserveZhangye 734400China University of Chinese Academy of Sciences Beijing 100049China

The link between climate and war has long been a topic of great scientific and social *** this study,we investigate the influence of climate on warfare in China’s Hexi Corridor region since 2.1 *** the superposed epoch analysis of tree-ring data and historical war data,we observe a notable correlation between interannual dry-wet variations and wars instigated by nomadic groups in the Hexi ***,this relationship is dynamic and influenced by the region’s relative *** periods in which the Hexi Corridor was ruled by multiple regimes,wars tended to follow dry climatic conditions,which may be due to the fact that unusual drought during these periods likely heightened competition for resources and ***,during times of regional unity,wars were more likely to occur when climatic conditions were wet because the expansion of rangelands and the accumulation of resources helped fuel the nomads’outward *** findings underscore the complexity of the relationship between war and climate *** gain a more comprehensive understanding of this relationship,continuous,high-resolution historical temperature and humidity datasets with broader and more uniform coverage are needed across multiple *** addition,collecting and examining disaggregated historical war data for regions with distinct characteristics is essential.

关键词： Drought Interannual dry and wet variations War The Hexi Corridor Tree ring Nomadic groups

The story of a decade:Genomics,functional genomics,and molecular breeding in Brassica napus

在线全文

学校读者我要写书评

暂无评论

Plant Communications 2024年第4期5卷 94-111页

作者： Jianwei Gu zhilin Guan Yushun Jiao Kede Liu Dengfeng Hong National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070HubeiChina College of Life Science and Technology Hubei Engineering UniversityXiaogan 432100 HubeiChina Wuhan Botanical Garden Chinese Academy of SciencesWuhan 430074 HubeiChina Yazhouwan National Laboratory Sanya 572024 HainanChina These authors contributed equally to this article.

Rapeseed(Brassica napus L.)is one of the major global sources of edible vegetable oil and is also used as a feed and pioneer crop and for sightseeing and industrial *** in genome sequencing and molecular marker technology have fueled a boom in functional genomic studies of major agronomic characters such as yield,quality,flowering time,and stress ***,introgression and pyra-miding of key functional genes have greatly accelerated the genetic improvement of important *** we summarize recent progress in rapeseed genomics and genetics,and we discuss effective molecular breeding strategies by exploring thesefindings in *** insights will extend our understanding of the molecular mechanisms and regulatory networks underlying agronomic traits and facilitate the breeding process,ultimately contributing to more sustainable agriculture throughout the world.

关键词： Brassica napus functional genomics genomics molecular breeding agronomic traits

Impacts of permafrost degradation on streamflow in the northern Himalayas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第6期67卷 1990-2000页

作者： Linfeng FAN Fang JI Xingxing KUANG zhilin GUO Rui ZHANG Chunmiao ZHENG State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610299China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210024China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Ningbo 315200China

The Himalayan water tower provides crucial water resources for *** degradation is deemed to exert important impacts on streamflow in the Himalayan ***,the magnitudes of such impacts remain poorly ***,we established a robust hydrological model that incorporated active layer deepening and ground ice melt for the drainage basin of the largest river in the northern Himalayas-the Yarlung Zangbo River(YZR).We estimated that permafrost degradation led to~0.65 km^(3)/yr decrease in surface runoff and~0.35 km^(3)/yr increase in baseflow and ground ice melt contributed~0.2.% to the annual streamflow in the YZR for the period ***“fill-and-spill”mechanism helps explain the seeming contradiction of observed increasing versus decreasing baseflow in different permafrost regions *** propose that the dilution of riverine dissolved organic carbon(DOC)concentrations by baseflow may lead to the riverine DOC hysteresis *** study not only lays solid scientific basis for water resources management in the Himalayas,but also yields new insights into how to interpret measured river discharge and nutrient flux in permafrost regions over the globe.

关键词： Permafrost degradation Hydrology Streamflow Surface runoff Groundwater Himalayas

Degradation Behavior of Zn-Cu Stents with Different Coatings in Sodium Chloride Solution

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1564-1580页

作者： Xingpeng Liao Jialuo Huang zhilin Liu Jingru Guo Dajiang Zheng Pengbo Chen Fuyong Cao Center for Marine Materials Corrosion and Protection Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamen361005China Light Alloys Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China First Affiliated Hospital of Xi’an Jiao Tong University Xi’an710061China

The Zn0.6Cu wires are fabricated into stents for the potential biodegradable application of nasal wound *** degradation behavior of Zn0.6Cu stents in 0.9 wt%NaCl at 36.5℃ is *** shows that the untreated Zn0.6Cu stent experiences severe crevice corrosion with acceleration and autocatalytic effects within the micro-cracks and ruptures at 4.67±1.15 d,with the average corrosion rate of 0.2. mm y^(-1).Fortunately,the anodic polarization(AP)+hydrothermal(H)conversion coating,consisting of ZnCO_(3),Zn(OH)_(2. and ZnO,could inhibit the crevice corrosion significantly by reducing the cathode/anode ratio,extending the rupture time up to 16.50±2.95 d,with the average corrosion rate of 0.14 mm y^(-1).This research indicates that the biodegradable Zn-based stent has some potential applications in nasal wound recovery area.

关键词： Zn alloys wires Corrosion behavior Biodegradable stents Coating Degradation characterization

Uncovering hidden nodes and hidden links in complex dynamic networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 51-63页

作者： Zhaoyang Zhang Xinyu Wang Haihong Li Yang Chen zhilin Qu Yuanyuan Mi Gang Hu Department of Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China Department of Medicine David Geffen School of MedicineUniversity of CaliforniaLos Angeles 90095USA Brainnetome Center and National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Psychology Tsinghua UniversityBeijing 100084China Department of Physics Beijing Normal UniversityBeijing 100875China

Inferring network structures from available data has attracted much interest in network science;however,in many realistic networks,only some of the nodes are perceptible while others are hidden,making it a challenging *** this work,we develop a method for reconstructing the network with hidden nodes and links,taking account of fast-varying noise and time-delay *** calculating the correlations of available data with different derivative orders for multiple pairs of accessible nodes,analyzing and integrating the relationships between different correlations,and defining diverse hidden-node-related reconstruction motifs,we can effectively identify the hidden nodes and hidden links in the network.

关键词： networks and genealogical trees stochastic analysis methods time series analysis

Unveiling Nb-Ta mineralization processes:Insight from quartz textural and chemical characteristics in the Songshugang deposit,Jiangxi Province,South China

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2024年第4期43卷 737-753页

作者： Hengsong Zhang Shaohao Zou Xilian Chen Deru Xu zhilin Wang Yongwen Zhang Hua Wang State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013JiangxiChina School of Earth Sciences East China University of TechnologyNanchang 330013JiangxiChina Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Jiangxi Mineral Resources Guarantee and Service Center Nanchang 330025JiangxiChina

The Songshugang deposit is a large Ta-Nb deposit in South China,with Ta-Nb mineralization associated genetically with the granite and pegmatite.A diversity of quartz from topaz-albite granite,quartz-mica pegmatite,quartz-feldspar pegmatite,and quartz-fluorite pegmatite at Songshugang was studied by CL and LA-ICP-MS in order to constrain enrichment mechanisms of Nb and Ta and to find geochemical indicators of quartz for rare metal *** image illuminates a canvas of complexity,the quartz from topaz-albite granite,quartz-mica pegmatite,quartz-feldspar pegmatite,and quartz-fluorite pegmatite,exhibits numerous dark CL streaks,patches,and a series of healed *** textures suggest that the rocks were fractured because of deep crustal pressure,and underwent later hydrothermal metasomatism and quartz *** quartz from quartz-fluorite pegmatite present limited patches or fractures but distinct growth bands,indicating that the melt fluid composition during the formation of quartz at this stage varies greatly and is less aff ected by mechanical *** LA-ICP-MS analysis of quartz shows that there is a positive correlation between Al and Li in the quartz from topaz-albite granite,quartz-mica pegmatite,quartz-feldspar pegmatite,to quartz-fluorite pegmatite,indicating that Al mainly enters the quartz lattice through charge compensation substitution mechanism with ***,our data deviate from the theoretical Li:Al mass ratio of~1:3.89 in quartz,indicating that there may be competition between H^(+)and Li in a water-rich magmatic *** quartz from topaz-albite granite is enriched in K and Na elements,and the quartz from quartz-fluorite pegmatite is enriched in fluorite with a low Ca content in quartz,further elucidating that these rocks were subjected to hydrothermal *** topaz-albitite granite to quartz-fluorite pegmatite,Al,Li and Ge content and Al/Ti,Ge/Ti,Sb/Ti ratios in quartz gradually increased,but

关键词： Nb-Ta deposit Quartz Cathodoluminescence LA-ICP-MS Trace elements Magma-hydrothermal evolution