检索结果-内蒙古大学图书馆

Significant changes in the physicochemical properties of BC-containing particles during the cold season in Beijing

Journal of Environmental sciences 2025年第5期151卷 667-676页

作者： Shuya Hu Linghan Zeng Gang Zhao Shiyi Chen Chunsheng Zhao Weilun Zhao Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Research Center for Atmospheric Research(IJRC)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science and TechnologyNanjing 210044China

The ambient air quality has improved significantly under strict emission controls in Beijing,China over the last *** carbon(BC),as a short-lived climate forcer in ambient aerosols,profoundly impacts the air quality and *** studies have demonstrated a decline in the mass concentration of *** this study,we characterized the chemical compositions and size distributions of BC-containing particles during the cold season of 2022 in Beijing using state-of-the-art instruments capable of exclusively measuring BCcontaining *** optical properties of BC-containing particles were further calculated based on the Mie ***,we compared the properties of BC-containing particles in 2022 with the results of previous *** results showed that the diameters of BC cores became larger while the coating thickness of BC-containing particles became thinner in *** the coating materials,the mass fraction of nitrate increased obviously,and even replaced organic matter as the dominant component during the peak of the pollution *** in chemical compositions and size distributions resulted in lower mass absorption cross-sections(MAC)of BC-containing particles from 10.5±1.1 m^(2)/g in 2016 to 7.3±0.8 m^(2)/g in 2022,reduced by 30.5%.Our results demonstrate the synergistic benefits of air pollution control in improving air quality and mitigating climate ***,the MAC of BC adopted in climate models should vary with the changing air pollution *** study emphasizes that it is imperative to conduct long-term observations of BC-containing particles to better estimate BC’s climate effects.

关键词： Black carbon Chemical composition Size distribution Light absorption ability

来源：评论

学校读者我要写书评

暂无评论

Prediction of New Functional Fluorooxoborates with Expected Anionic Framework:A Case of CaB_(3)O_(5)F

引用

Chinese Physics Letters 2025年第3期42卷 85-92页

作者： Ke-Wang Zhang Wen-Qi Jin Ke Li Abudukadi Tudi Lin-Lin Liu Cong-Wei Xie Yu Xie Research Center for Crystal Materials CAS Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Functional Crystal MaterialsXinjiang Technical Institute of Physics&ChemistryCASUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Materials Simulation Methods&Software of Ministry of Education International Center of Future ScienceKey Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education)College of PhysicsJilin UniversityChangchun 130012China

The prediction of new fluorooxoborates as ultraviolet(UV)/deep ultraviolet(DUV)opto-electronic functional materials from a largely unexplored chemical space is a challenging *** has been suggested that the anionic frameworks formed by B–O and B–O–F units significantly determine the physical properties of ***,the rational design of anionic frameworks could facilitate the materials discovery ***,we propose that a candidate anionic framework can be efficiently derived from an existing one by slightly altering its oxygen *** this idea,we hypothesized the existence of a 1D[B_(3)O_(5)F]_(∞)chain from the wellknown 2D[B_(6)O_(9)F_(2_)]_(∞)***,seven CaB_(3)O_(5)F structures with the expected anionic framework were successfully ***-principles calculations show that all these structures have potential in the UV/DUV birefringent or nonlinear optical(NLO)material field,indicating that the 1D[B_(3)O_(5)F]_(∞)chain is indeed a promising anionic framework for achieving UV/DUV birefringent and NLO performance.

关键词： process borate anionic

来源：评论

学校读者我要写书评

暂无评论

A theoretical and experimental study of deformation mechanism dictated by disclination-dislocation coupling in Mg alloys at different temperatures

引用

材料科学技术（英文版） 2025年第5期208卷 176-188页

作者： Chunfeng Du Yipeng Gao Yizhen Li Quan Li Min Zha Cheng Wang Hailong Jia Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China International Center of Future Science Jilin UniversityChangchun 130012China International Center of Future Science Jilin UniversityChangchun 130012China State Key Lab of Superhard Materials and Key Laboratory of Material Simulation Methods&Software of Ministry of Education College of PhysicsJilin UniversityChangchun 130012China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China International Center of Future Science Jilin UniversityChangchun 130012China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Material Science and EngineeringHebei University of TechnologyTianjin 300130China

Dislocations and disclinations are fundamental topological defects within crystals,which determine the mechanical properties of metals and *** their important roles in multiple physical mecha-nisms,e.g.,dynamic recovery and grain boundary mediated plasticity,the intrinsic coupling and corre-lation between disclinations and dislocations,and their impacts on the deformation behavior of metallic materials still remain obscure,partially due to the lack of a theoretical tool to capture the rotational na-ture of *** using a Lie-algebra-based theoretical framework,we obtain a general equation to quantify the intrinsic coupling of disclinations and *** quasi in-situ electron backscat-ter diffraction characterizations and disclination/dislocation density analyses in Mg alloys,the generation,coevolution and reactions of disclinations and dislocations during dynamic recovery and superplastic de-formation have been quantitatively *** has been demonstrated that the obtained governing equa-tion can capture multiple physical processes associated with mechanical deformation of metals,e.g.,grain rotation and grain boundary migration,at both room temperature and high *** establishing the disclination-dislocation coupling equation within a Lie algebra description,our work provides new insights for exploring the coevolution and reaction of disclinations/dislocations,with profound implica-tions for elucidating the microstructure-property relationship and underlying deformation mechanisms in metallic materials.

关键词： Magnesium alloys Dislocations Grain boundaries Plastic deformation Grain rotation Disclination-dislocation coupling

来源：评论

学校读者我要写书评

暂无评论

Fatigue reliability analysis of offshore wind turbines under combined wind-wave excitation via DPIM

arXiv

引用

arXiv 2025年

作者： Ding, Jingyi Chen, Hanshu Liu, Xiaoting Rashed, Youssef F. Fu, Zhuojia Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Engineering Science Hohai University Jiangsu Nanjing211100 China Institute of Science and Technology Research China Three Gorges Corporation Beijing210098 China Department of Structural Engineering Cairo University Giza Egypt

As offshore wind turbines develop into deepwater operations, accurately quantifying the impact of stochastic excitations in complex sea environments on offshore wind turbines and conducting structural fatigue reliability analysis has become challenging. In this paper, based on long-term wind-wave reanalysis data from a site in the South China Sea, a novel direct probability integral method (DPIM) is developed for the stochastic response and fatigue reliability analyses of the key components for the floating offshore wind turbine structures under combined wind-wave excitation. A 5MW floating offshore wind turbine is considered as the research object, and a fully coupled dynamic response analysis of the wind turbine system is conducted to calculate the short-term fatigue damage value of tower base and blade root. The DPIM is applied to calculate the fatigue reliability of the wind turbine structure. The accuracy and efficiency of the proposed method are validated by comparing the obtained results with those of Monte Carlo simulations. Furthermore, the results indicate that the fatigue life of floating offshore wind turbine structures under combined wind-wave excitation meets the design requirements. Notably, the fatigue reliability of the wind turbine under aligned wind-wave condition is lower compared to misaligned wind-wave condition. Copyright © 2025, The Authors. All rights reserved.

关键词： Offshore wind turbines

来源：评论

学校读者我要写书评

暂无评论

Substitution of Y, Ce, and Th for La in LaBeH8 as a path towards lower synthesis pressures of superconducting hydrides

引用

Physical Review B 2025年第18期111卷 184512-184512页

作者： Yuan Ma Jie Luo Sheng Meng Xin Zhong Guangtao Liu Hanyu Liu Yanming Ma Key Laboratory of Material Simulation Methods and Software of Ministry of Education and State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China Institute of Physics Chinese Academy of Sciences Beijing 100190 China International Center of Future Science Jilin University Changchun 130012 China

Recent theory-guided discoveries of hydrides exhibiting high superconducting temperatures (Tc) exceeding 200 K above 150 GPa have sparked the enthusiasm for the pursuit of room-temperature ambient-pressure superconductors. While efforts to increase the Tc's of these hydrides are underway, optimizing the demanding high-pressure synthesis conditions remains a challenge. Several studies suggested that a multielemental alloying strategy could be a feasible approach to tackle this formidable task. Here, we present an example using LaBeH8 to establish several alloy hydrides via the substitution of La atoms with similar metal atoms, such as Y, Ce, and Th. Quasiquaternary alloy hydride (La,Y,Ce,Th)BeH8 is computed to become thermodynamically stable at 70 GPa and a typically realistic temperature of ∼2000 K for synthesizing high-Tc hydrides, compared with the calculated results showing thermodynamic instability above 300 GPa without considering entropy. Our in-depth analysis revealed that not only does entropy play a crucial role in stabilizing alloy hydrides at moderate pressures and high temperatures, but also the energy contribution from vibrational entropy is much more significant than configurational entropy, where configurational entropy has long been believed to play a key role in the stability of multielemental alloy. Furthermore, extensive electron-phonon simulations indicate that the estimated Tc of (La,Y,Ce,Th)BeH8 could reach near ∼100 K at 70 GPa. The present work offers a fresh perspective on the design and realization of high-Tc multielemental alloy hydrides towards near-ambient pressure.

关键词： Thermodynamic stability

来源：评论

学校读者我要写书评

暂无评论

A Lightweight Authentication Protocol for RFID-Assisted Supply Chain Management System

引用

IEEE Internet of Things Journal 2025年第9期12卷 12845-12852页

作者： Tariq, Tayyaba Kuo, Wen-Chung Mahmood, Khalid Shamshad, Salman Das, Ashok Kumar Alenazi, Mohammed J. F. National Yunlin University of Science and Technology Graduate School of Engineering Science and Technology Yunlin Douliu64002 Taiwan National Yunlin University of Science and Technology Department of Computer Science and Information Engineering Douliu64002 Taiwan National Yunlin University of Science and Technology Graduate School of Intelligent Data Science Yunlin Douliu64002 Taiwan University of Lahore Department of Software Engineering Lahore54590 Pakistan International Institute of Information Technology Hyderabad Center for Security Theory and Algorithmic Research Hyderabad500032 India Korea University College of Informatics Department of Computer Science and Engineering Seoul02841 Korea Republic of King Saud University College of Computer and Information Sciences Department of Computer Engineering Riyadh11451 Saudi Arabia

In the evolving landscape of supply chain management, the integration of radio-frequency identification (RFID) technology has marked a significant milestone. This development has led to the emergence of a new system in RFID-based supply chain management, which is intricately linked with the advances in the Internet of Things (IoT). RFID technology employs electromagnetic fields to identify and track tags on objects and revolutionizes the management and tracking of items in the supply chain. However, the public communication among RFID tags, RFID readers, and supply chain infrastructure predominantly escalates security and privacy challenges. Several authentication protocols have been proposed to overcome these challenges. However, the vulnerability of most proposed protocols to numerous security attacks renders them inefficient. Therefore, to address these crucial challenges, we devised an RFID-based authentication protocol for supply chain management systems. The incorporation of a physically unclonable function (PUF) into the protocol fortifies the system against physical tampering attacks. To validate the security and effectiveness of the devised protocol, both informal and formal security analysis are conducted. The formal security analysis is conducted using the widely used random oracle model. The informal security analysis reveals that the devised protocol provides enhanced and efficient security features. Furthermore, we perform a comparative analysis with related protocols, focusing on critical performance metrics like communication cost, computation cost, and overall security features. The results of the comparative analysis are promising, indicating a substantial 30.92% reduction in computational cost and a 23.98% reduction in communication cost in comparison to related protocols, thus highlighting the protocol’s superior performance and resource efficiency. © 2014 IEEE.

关键词： Authentication Protocol

来源：评论

学校读者我要写书评

暂无评论

Superacid assisted high-throughput production and solution-processing of pristine two-dimensional materials

引用

Materials Today 2025年 86卷 228-237页

作者： Deng, Qixuan Ma, Jiabin Liu, Minsu Zhou, Yicong Ding, Siyuan Zhan, Ke Zhu, Yuan Xiong, Zhiyuan Su, Yang Yu, Kuang Cheng, Hui-Ming Qiu, Ling Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Department of Materials Science and Engineering Monash University VIC3800 Australia Monash Suzhou Research Institute Monash University Suzhou Suzhou SIP215000 China School of Microelectronics Southern University of Science and Technology Shenzhen518055 China School of Light Industry and Engineering South China University of Technology Guangzhou510640 China Shenzhen Key Lab of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences 1068 Xueyuan Road Shenzhen518055 China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced Technology 291 Louming Road Shenzhen518107 China

Pristine two-dimensional (2D) materials have a multitude of interesting properties, promising a broad spectrum of applications. However, their poor affinity for common solvents and tendency to aggregate impede their effective exfoliation and solution-processing into various structures, such as fibers and membranes, thus limiting their practical use. We report a high-efficiency method for producing pristine 2D nanosheets by direct high-speed shearing exfoliation in trifluoromethanesulfonic acid (TfOH). Typically, this method produces hexagonal boron nitride nanosheets (BNNSs) with an unprecedented throughput of 38.8 mg mL-1h−1. The effective exfoliation is attributed to the strong binding affinity, large dipole moment and steric repulsion of TfOH, which collectively introduce layer edge distortion in hexagonal boron nitride (hBN), facilitating its exfoliation. The mechanical exfoliation and reversible edge interaction introduce no additional functional groups to the exfoliated BNNSs. The resulting pristine BNNS exhibit remarkable stability in TfOH solutions at ultrahigh concentrations of 200 mg mL−1 for over 28 days. The viscosity of the highly concentrated BNNS/TfOH dispersion can be adjusted, enabling techniques to produce BNNS-based spheres, fibers, and membranes with high thermal conductivity and mechanical strength, suitable for advanced thermal management applications. Room temperature processed BNNS-based spheres exhibit superior thermal conductivity compared to high temperature processed commercially available hBN or Al2O3 spheres. Moreover, TfOH can also be used to assist the efficient production and solution-processing of other 2D nanosheets, including graphene, molybdenum disulfide and tungsten disulfide, enabling the fabrication of high-quality bulk assemblies. © 2025 Elsevier Ltd

关键词： Molybdenum disulfide

来源：评论

学校读者我要写书评

暂无评论

Synthesis of medium-entropy alloy superhydride (La,Y,Ce)H10±x with high-temperature superconductivity under high pressure

引用

Physical Review B 2025年第2期111卷 024505-024505页

作者： Chuanheng Ma Mi Zhou Jingkai Bi Yuan Ma Dongdong Li Hanyu Liu Guangtao Liu Hongbo Wang Yanming Ma Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun 130012 China Institute of Quantum Materials and Physics Henan Academy of Sciences Zhengzhou 450046 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China International Center of Future Science Jilin University Changchun 130012 China

Metal substitutions have been recognized as an efficient approach for exploring unusual superhydrides, aiming to discover configurations with diverse structures and enhanced superconductivity. However, the roles of the metal type and concentration on high-temperature superconducting (high-Tc) hydrides with multiple components remain underexplored in this rapidly advancing domain. In this study, we conducted extensive experiments on the equimolar La-Ce-Y alloy superhydride with the highest configuration entropy among quaternary hydrides under pressure. In situ X-ray diffraction measurements revealed the synthesis of a hexagonal close-packed (hcp) P63/mmc-(La,Ce,Y)H10±x (−0.2

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

Stochastic dynamic analysis of multi-layer functionally graded material cylinders using direct probability integral method with improved smoothing technique

引用

Probabilistic engineering Mechanics 2025年 80卷

作者： Lu, Wen Wu, Zhigen Yang, Dixiong Meng, Zeng Chen, Hanshu School of Civil Engineering Hefei University of Technology Hefei230009 China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian116024 China Jianghuai Advance Technology Center Hefei230000 China Center for Numerical Simulation Software in Engineering and Sciences College of Mechanics and Engineering Science Hohai University Nanjing211100 China

Uncertainties are inherently inevitable in the application of functionally graded materials (FGMs) structures. Existing analysis methods face challenges in terms of accuracy and efficiency when addressing these uncertainties, especially for dynamic problems. To this end, this paper proposes a direct probability integral method with improved smoothing technique (DPIM-IST) for the stochastic dynamic analysis of FGM cylinders. Subsequently, an adaptive framework is constructed based on the maximum entropy principle to determine the variable smoothing parameters at each representative point. To search for the proper smoothing parameter vector, a hybrid grey wolf optimizer is employed, which combines the grey wolf optimizer and BFGS method. Moreover, the dynamic responses at each representative point are evaluated by utilizing the differential quadrature method and Newmark algorithm. Several numerical and multiphase and multi-layer FGM hollow cylinder examples, involving nonlinear performance functions with Gaussian and non-Gaussian parameters, are investigated to validate the accuracy of the proposed DPIM-IST. © 2025 Elsevier Ltd

关键词： Integral equations

来源：评论

学校读者我要写书评

暂无评论

A modeling framework for assessing the future changes in the occurrence of extreme rain-induced landslides

引用

Gondwana Research 2025年 143卷 52-63页

作者： Zhang, Xinlong Lin, Qigen Lok, Manhoi Huang, Taosheng Yu, Xuan Wang, Weiping Shen, Ping State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of Macau Macao SAR China Institute for Disaster Risk Management School of Geographical Sciences Nanjing University of Information Science & Technology Nanjing China Department of Civil and Environmental Engineering University of Macau Macao SAR China Center for Water Resources and Environment School of Civil Engineering Sun Yat-sen University Guangzhou China School of National Safety and Emergency Management Beijing Normal University Zhuhai China Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance Beijing Normal University Zhuhai China

Landslides triggered by extreme rainfall pose a serious threat to lives and livelihoods under climate change. However, the influence of climate change on the frequency and intensity of extreme rainfall and the resulting landslide hazard remains insufficiently investigated. Here we develop a novel framework to assess how future changes in extreme rainfall affect landslide occurrence, using a comprehensive dataset of landslide events in Guangdong province, China. We apply the XGBoost machine learning algorithm with a correction by feature interaction constraints to model landslide hazards based on various predisposing and triggering factors. We use a new extreme rainfall correction method to account for the global climate model-projected changes in rainfall patterns under different emission scenarios, based on which we perform a multi-model ensemble analysis to reduce the uncertainty of climate projections. We find that regions with high landslide probability are strongly associated with intense rainfall events, especially in steep and erodible river valleys. Our projections show that under a high-emission scenario, extreme rainfall events and landslide hazards will increase substantially in Guangdong, highlighting the urgency of adaptation of climate change and risk management. Our framework provides a valuable tool for understanding the interactions between climate change, extreme rainfall, and landslide occurrence, and for developing effective mitigation strategies. © 2025 international Association for Gondwana Research

关键词： Climate change Extreme rainfall Machine Learning Rain-induced landslides

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：