检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Jiang, Ye Kang Zhuo, Bai Ma Guo, Bing Zeng, Pei-Bin Guo, Yu-Ming Chen, Gong-Bo Wei, Jing He, Rui-Feng Li, Zhi-Feng Zhang, Xue-Hui Wang, Zi-Yun Li, Xuan Wang, Lei Zeng, Chun-Mei Chen, Lin Xiao, Xiong Zhao, Xing West China School of Public Health and West China Fourth Hospital Sichuan University Sichuan Chengdu China Division of Pulmonary Diseases State Key Laboratory of Biotherapy West China Hospital of Sichuan University Sichuan Chengdu China School of Medicine Tibet University Tibet Lhasa China Department of Epidemiology and Preventive Medicine School of Public Health and Preventive Medicine Monash University MelbourneVIC3004 Australia Guangdong Provincial Engineering Technology Research Center of Environmental and Health Risk Assessment Department of Occupational and Environmental Health School of Public Health Sun Yat-sen University Guangdong Guangzhou China Department of Atmospheric and Oceanic Science Earth System Science Interdisciplinary Center University of Maryland College ParkMD United States Tibet Center for Disease Control and Prevention Tibet Lhasa China Chongqing Municipal Center for Disease Control and Prevention Chongqing China School of public Health Kunming Medical University Yunnan Kunming China School of Public Health The key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Medical University Guiyang550025 China Jianyang Center for Disease Control and Prevention Sichuan Chengdu China

Background Numerous studies show that living near more greenness may benefit various health outcomes. Nevertheless, no studies have investigated the greenness-bone linkage in the general population with large sample sizes. Moreover, to what extent ambient air pollution (AAP) and physical activity (PA) mediate this relationship is unclear. We aimed to explore the association between greenness and bone strength in Chinese adults and the potential mediating role of AAP and PA behind it. Methods A total of 66,102 adults from the China Multi-Ethnic Cohort (CMEC) in 2018-2019 were enrolled. The Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) were employed as the residential greenness definition. Calcaneus quantitative ultrasound index (QUI) was regarded as an indicator of bone strength. Multiple linear regression models and causal mediation analyses were used to estimate the residential greenness-bone strength association and the potential pathways operating through PA and AAP. Stratification analyses were also adopted to identify susceptible populations. Results Increased residential exposure to greenness were significantly associated with higher QUI, with changes (95% confidence interval) of 3.04 (2.81, 3.26), 3.35 (3.12, 3.58), 2.44 (2.22, 2.66), and 2.71 (2.49, 2.93) for every interquartile range (IQR) increased in NDVI 500m , NDVI 1000m , EVI 500m , EVI 1000m , respectively. Gender, urbanicity, and annual family income significantly modified the links of greenness and bone strength, with more remarkable associations in males, urban residents, and subjects with higher family income. In the NDVI 500m /EVI 500m -QUI relationship, the mediating role of AAP was high reached 39.19% and 52.53%, while that of PA was only 1.64% and 1.68%. Conclusion Living in a greener place may improve bone strength, especially among males, urban residents, and the wealthier. These protective effects may be mainly operated by reducing the hazard effects of A

关键词： Housing

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Data-Driven Parametric Design of Additively Manufactured Hybrid Lattice Structure for Stiffness and Wide-Band Damping Performance

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Additive Manufacturing Frontiers 2025年

作者： Chenyang Li Shangqin Yuan Han Zhang Shaoying Li Xinyue Li Jihong Zhu State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072 China Key Laboratory of Metal High-Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University Xi'an 710072 China Institute of Intelligence Material and Structure Unmanned System Research Institute Northwestern Polytechnical University Xi'an 710072 China Aircraft Strength Research Institute of China Xi'an 710065 China Modern Control Technology Research Institute Xi'an 710065 China

The outstanding comprehensive mechanical properties of newly developed hybrid lattice structures make them useful in engineering applications for bearing multiple mechanical loads. Additive-manufacturing technologies make it possible to fabricate these highly spatially programmable structures and greatly enhance the freedom in their design. However, traditional analytical methods do not sufficiently reflect the actual vibration-damping mechanism of lattice structures and are limited by their high computational cost. In this study, a hybrid lattice structure consisting of various cells was designed based on quasi-static and vibration experiments. Subsequently, a novel parametric design method based on a data-driven approach was developed for hybrid lattices with engineered properties. The response surface method was adopted to define the sensitive optimization target. A prediction model for the lattice geometric parameters and vibration properties was established using a backpropagation neural network. Then, it was integrated into the genetic algorithm to create the optimal hybrid lattice with varying geometric features and the required wide-band vibration-damping characteristics. Validation experiments were conducted, demonstrating that the optimized hybrid lattice can achieve the target properties. In addition, the data-driven parametric design method can reduce computation time and be widely applied to complex structural designs when analytical and empirical solutions are unavailable.

关键词： Hybrid lattice structure Data-driven wide-band damping Machine-learning method

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Localization and Surface Characterization by Zhurong Mars Rover at Utopia Planitia

Research Square

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research Square 2021年

作者： Ding, Liang Zhou, Ruyi Yu, Tianyi Gao, Haibo Yang, Huaiguang Li, Jian Yuan, Ye Liu, Chuankai Wang, Jia Zhao, Yuyan Wang, Zhengyin Wang, Xiyu Bao, Gang Deng, Zongquan Huang, Lan Li, Nan Cui, Xiaofeng He, Ximing Jia, Yang Yuan, Baofeng Liu, Guangjun Zhang, Hui Zhao, Rui Zhang, Zuoyu Cheng, Ziqing Wu, Fan Xu, Qian Lu, Hao Richter, Lutz Liu, Zhen Niu, Fuliang Qi, Huanan Li, Shu Feng, Wenhao Yang, Chaojie Chen, Baichao Dang, Zhaolong Zhang, Mingming Li, Lichun Wang, Xiaoxue Huang, Zhao Zhang, Jitao Xing, Hongjun Wang, Guanyu Niu, Lizhou Xu, Peng Wan, Wenhui Di, Kaichang State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150080 China Beijing Aerospace Control Center Beijing100094 China Center for Lunar and Planetary Sciences Institute of Geochemistry Chinese Academy of Science Guiyang550081 China CAS Center for Excellence in Comparative Planetology Hefei230026 China University of Chinese Academy of Sciences Beijing100049 China Beijing Institute of Spacecraft System Engineering Beijing100094 China Department of Aerospace Engineering Ryerson University TorontoONM5B 2K3 Canada Hauptstrasse 1e Eching Germany State Key Laboratory of Remote Sensing Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing100101 China

China’s first Mars rover, Zhurong, has successfully touched down on the southern Utopia Planitia of Mars at 109.925° E, 25.066° N, and since performed cooperative multiscale investigations with the Tianwen-1 orbiter. Here we present primary localization and surface characterization results based on complementary data of the first 60 sols. The Zhurong rover has traversed 450.9 m southwards over a flat surface with mild wheel slippage (less than 0.2 in slip ratio). The encountered crescent-shaped sand dune indicates a NE-SW local wind direction, consistent with larger-range remote-sensing observations. Soil parameter analysis based on terramechanics indicates that the topsoil has high bearing strength and cohesion, and its equivalent stiffness and internal friction angle are ~1390-5872 kPa∙m-n and ~21°-34° respectively. Rocks observed strewn with dense pits, or showing layered and flaky structures, are presumed to be involved in physical weathering like severe wind erosion and potential chemical weathering processes. These preliminary observations suggest great potential of in-situ investigations by the scientific payload suite of the Zhurong rover in obtaining new clues of the region’s aeolian and aqueous history. Cooperative investigations using the related payloads on both the rover and the obiter could peek into the habitability evolution of the northern lowlands on Mars. © 2021, CC BY.

关键词： Sols

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Could the Recent Taal Volcano Eruption Trigger an El Ni?o and Lead to Eurasian Warming?

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Advances in Atmospheric Sciences 2020年第7期37卷 663-670页

作者： Fei LIU Chen XING Jinbao LI Bin WANG Jing CHAI Chaochao GAO Gang HUANG Jian LIU Deliang CHEN School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Earth System Modeling and Climate Dynamics Research Center Nanjing University of Information Science and TechnologyNanjing 210044China Department of Geography University of Hong KongPokfulamHong Kong Department of Atmospheric Sciences and International Pacific Research Center University of Hawaii at ManoaHonoluluHI 96822USA Department of Environmental Science Zhejiang UniversityHangzhou 310058China State key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory for Virtual Geographic Environment Ministry of EducationJiangsu Provincial State Key Laboratory Cultivation Base of Geographical Environment EvolutionSchool of Geography ScienceNanjing Normal UniversityNanjing 210023China Department of Earth Sciences University of GothenburgGothenburg 40530Sweden

The Taal Volcano in Luzon is one of the most active and dangerous volcanoes of the Philippines.A recent eruption occurred on 12 January 2020(Fig.1a),and this volcano is still active with the occurrence of volcanic *** eruption has become a deep concern worldwide,not only for its damage on local society,but also for potential hazardous consequences on the Earth’s climate and environment.

关键词： Volcano Philippines worldwide

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Investigating the role of aerosol wet scavenging on global horizontal irradiance simulation in the WRF-Chem-solar model

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Applied Energy 2025年 396卷

作者： Su Wang Gang Huang Tie Dai Junji Cao Letu Husi Run Ma Cuina Li State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) Nanjing University of Information Science and Technology Nanjing 210044 China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Remote Sensing Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing 100081 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Yibin 644005 China Meteorological Observation Center of China Meteorological Administration Beijing 100081 China

Solar energy emerges as a vital renewable resource with profound implications for future energy consumption. To improve the accuracy of global horizontal irradiance (GHI) simulation, this study integrates the Thompson and Eidhammer aerosol-aware cloud microphysics scheme with the aerosol module Goddard Ozone Chemistry Aerosol Radiation and Transport (GOCART) in the WRF-Solar model. Based on the new coupled aerosol-cloud interaction, a physical parametric aerosol wet scavenging scheme is developed to investigate its effects on aerosol and GHI simulations. Our results demonstrate that the updated wet removal enhances the spatial representation of aerosol optical depth (AOD) across China, particularly in regions influenced by anthropogenic aerosols such as Northern, Central and Eastern China. The average absolute mean bias (BIAS) value for AOD decreases by 20.00 %, leading to a 36.47 % improvement in reducing the overestimation of GHI under clear sky. The most remarkable BIAS reductions occur in Central (104.30 %), Western (45.70 %), and Eastern China (41.42 %) for GHI under clear sky, especially in high surface solar radiation zones (>500 W/m 2 ). Similar improvements are observed for GHI under all-sky conditions, with a national relative improvement of 29.91 %. Central, Eastern, and Western China show the most substantial BIAS reductions, with relative decreases of 57.48 %, 50.62 %, and 32.40 %, respectively. Overall, this study highlights the potential of the enhanced aerosol wet scavenging scheme to improve GHI simulation accuracy, providing valuable insights for advancing renewable energy initiatives.

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Biochar addition affects soil carbon stock by altering keystone fungal species and necromass abundance and oxidase activities in forest and paddy soils

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Pedosphere 2024年

作者： Leiyi ZHANG Yingxin WU Jie ZHANG Kumuduni Niroshika PALANSOORIYA Chao LIU Rahat SHABIR Yao HUANG Qianying SUN Wencheng WU Scott X. CHANG Guangdong Engineering &Technology Research Center for System Control of Livestock and Poultry Breeding Pollution South China Institute of Environmental Sciences MEE Guangzhou 510535 (China) State Key Laboratory of Subtropical Silviculture Zhejiang A&F University Hangzhou 311300 (China) School of Environmental Science and Engineering Hainan University Haikou 570228 (China) Australian Rivers Institute and School of Environment and Science Griffith University Brisbane 4111 (Australia) National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil Sciences Guangdong Academy of Sciences Guangzhou 510650 (China) Department of Renewable Resources University of Alberta Edmonton AB T6G 2E3 (Canada)

Fungi play a crucial role in the utilization and storage of soil organic carbon (SOC). Biochar can potentially influence soil carbon (C) turnover by mediating extracellular electron transfer, which can be facilitated by fungi. However, the effects of biochar and soil types on the community, abundance, enzyme secretion, and necromass of fungi mediating SOC storage remain unclear. Using a mesocosm experiment, we studied the impact of biochars pyrolyzed at low (300 °C, BL) and high (700 °C, BH) temperature on fungal abundance, community composition, necromass size, and C-degrading enzyme activities in forest and paddy soils from southern China. The SOC retention ratio was higher under BL (84.0%) than under BH (76.3%). The BL (an electron shuttle) application increased fungal abundance in the forest soil by 230%. In contrast, BH (a geological capacitor) decreased fungal abundance in the paddy soil by 20.8%. Biochar addition affected fungal necromass accumulation and oxidase activity and regulated SOC turnover. The BL’s high available C and moderate liming effects significantly increased fungal abundance and its necromass in the forest soil compared to the paddy soil. Moreover, after 16 weeks of incubation, BL addition decreased peroxidase activity by 32.1% in the forest soil due to the higher C use efficiency of fungi ( i.e. , the enrichment of Talaromyces, Umbelopsis , and Trichoderma ), decreasing C-degrading enzyme secretion and reducing SOC degradation compared to the paddy soil. However, BH addition increased the Fusarium abundance, which regulated the polyphenol oxidase activity and promoted SOC degradation in the paddy soil. We conclude that biochars alter the soil environment and extracellular electron transfer to mediate fungal-driven necromass content and C-degrading enzyme activities, thus affecting SOC storage in forest and paddy soils.

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Broadband Electromagnetic Wave Tunneling with Transmuted Material Singularity

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Physical Review Letters 2020年第20期125卷 207401-207401页

作者： Yichao Liu Fei Sun Yibiao Yang Zhihui Chen Jianzhong Zhang Sailing He Yungui Ma Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou 310058 China Department of Electromagnetic Engineering School of Electrical Engineering Royal Institute of Technology (KTH) S-100 44 Stockholm Sweden

Subwavelength channels filled with near-zero-index (NZI) media can realize extraordinary optical functionalities, for example, tunneling electromagnetic wave without reflections, but usually confined in a narrow wavelength band due to the material singularity (refractive index n≈0), which seriously limits the practical potentials. In this Letter, we show this limit can be fundamentally overcome by an alternative, named near-zero-index-featured (NZIF) structure, with the singularity transmuted via a controlled optical conformal mapping, enabling the device implementation with nonmagnetic normal dielectrics (i.e., relative permittivity >1). Their equivalence is strictly examined through a subwavelength tunneling waveguide. Classic wave tunneling features in a broad frequency range are revealed in various confined geometries. These properties are robust against the disturbance of several kinds of structural defects benefited from the infinite effective local wavelength. The broadband and lossless NZIF medium proposed here provides a promising way to pursue the fascinating light controlling functionalities as initially enabled by singular NZI materials.

关键词： Transformation optics Waveguides

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Strength-based concurrent design for structural topology and building orientation of additively manufactured lattice structure

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Chinese Journal of Aeronautics 2024年

作者： Chenyang LI Yamin LI Shangqin YUAN Shaoying LI Jihong ZHU Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical Engineering Northwestern Polytechnical University Xi’an 710072 China MIIT Lab of Metal Additive Manufacturing and Innovative Design Northwestern Polytechnical University Xi’an 710072 China Research & Development Institute of Northwestern Polytechnical University in Shenzhen Sanhang Science & Technology Building Shenzhen 518063 China Unmanned System Research Institute Northwestern Polytechnical University Xi’an 710072 China Modern Control Technology Research Institute Xi’an 710065China

A novel additive manufacturing (AM)-driven concurrent design strategy based on the beam characterization model considering strength constraints is proposed. The lattice topology, radius size, building orientation (BO), and structural yield strength can be simultaneously adjusted by integrating the overall process-structure-performance relationship of the AM process into the optimization. Specifically, the transverse isotropic material model is adopted to describe the material properties induced by the layer-by-layer manner of additive manufacturing. To bolster lattice strength performance, the stress constraints and ratio constraints of lattice struts are employed. The Tsai-Wu yield criterion is implemented to characterize the lattice strut’s strength, while the P-norm method streamlines the handling of multiple constraints, minimizing computational overhead. Moreover, the gradient-based optimization model is established, where both the individual struts diameters and BO can be designed, and the buckling-prone spatial struts are strategically eliminated to improve the lattice strength further. Furthermore, several typical structures are optimized to verify the effectiveness of the proposed method. The optimized results are quite encouraging since the heterogeneous lattice structures with optimized BO obtained by the strength-based concurrent method show a remarkably improved performance compared to traditional designs.

关键词： Strength-based design AM-driven design Concurrent design Building orientation Additive manufacturing

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Optimal interface surface determination for multi-axis freeform surface machining with both roughing and finishing

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Chinese Journal of Aeronautics 2018年第2期31卷 370-384页

作者： Lufeng CHEN Pengcheng HU Ming LUO Kai TANG Hong Kong University of Science and Technology Hong Kong China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministory of EducationNorthwestern Polytechnical University Xi'an 710072 China

In the current practice of multi-axis machining of freeform surfaces, the interface surface between the roughing and finishing process is simply an offset surface of the nominal surface. While there have already been attempts at minimizing the machining time by considering the kinematic capacities of the machine tool and/or the physical constraints such as the cutting force, they all target independently at either the finishing or the roughing process alone and are based on the simple premise of an offset interface surface. Conceivably, since the total machining time should count that of both roughing and finishing process and both of them crucially depend on the interface surface, it is natural to ask if, under the same kinematic capacities and the same physical constraints, there is a nontrivial interface surface whose corresponding total machining time will be the minimum among all the possible（infinite） choices of interface surfaces, and this is the motivation behind the work of this paper. Specifically, with respect to the specific type of iso-planar milling for both roughing and finishing, we present a practical algorithm for determining such an optimal interface surface for an arbitrary freeform surface. While the algorithm is proposed for iso-planar milling, it can be easily adapted to other types of milling strategy such as contour milling. Both computer simulation and physical cutting experiments of the proposed method have convincingly demonstrated its advantages over the traditional simple offset method.

关键词： Feed rate Finishing and roughing process Interface surface lso-planar tool path Physical constraints

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Improving sum-rate of cell-free massive MIMO with expanded compute-and-forward

arXiv

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arXiv 2021年

作者： Zhang, Jiayi Zhang, Jing Ng, Derrick Wing Kwan Jin, Shi Ai, Bo The School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China The Frontiers Science Center for Smart High-Speed Railway System Beijing Jiaotong University Beijing100044 China The School of Electrical Engineering and Telecommunications University of New South Wales NSW2052 Australia The National Mobile Communications Research Laboratory Southeast University Nanjing210096 China The State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis Zhengzhou University Zhengzhou450001 China Research Center of Networks and Communications Peng Cheng Laboratory Shenzhen China

Cell-free massive multiple-input multiple-output (MIMO) employs a large number of distributed access points (APs) to serve a small number of user equipments (UEs) via the same time/frequency resource. Due to the strong macro diversity gain, cell-free massive MIMO can considerably improve the achievable sum-rate compared to conventional cellular massive MIMO. However, the performance of cell-free massive MIMO is upper limited by inter-user interference (IUI) when employing simple maximum ratio combining (MRC) at receivers. To harness IUI, the expanded compute-and-forward (ECF) framework is adopted. In particular, we propose power control algorithms for the parallel computation and successive computation in the ECF framework, respectively, to exploit the performance gain and then improve the system performance. Furthermore, we propose an AP selection scheme and the application of different decoding orders for the successive computation. Finally, numerical results demonstrate that ECF frameworks outperform the conventional CF and MRC frameworks in terms of achievable sum-rate. Copyright © 2021, The Authors. All rights reserved.

关键词： Power control

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