检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Peng, Siyuan Yang, Yue Luo, Dengnan Zeng, Xiang Liang, Minqi Tao, Long Zhang, Guangru Li, Pan Liao, Weijie Guo, Qun Cao, Ruochen Li, Yuzhe Zhang, Weirong Hu, Zhongmin School of Geography South China Normal University Shipai Campus Guangzhou510631 China Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation School of Ecology and Environment Hainan University Haikou570228 China Center for Eco-Environment Restoration Engineering of Hainan Province Hainan University Haikou570228 China Facility of Geographical Science Beijing Normal University Beijing100875 China Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Zhuhai519087 China School of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle Sun Yat-sen University Guangdong Zhuhai510245 China Key Lab of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing101408 China International Institute for Earth System Sciences Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing University Jiangsu210023 China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources School of Geography and Ocean Science Nanjing University Jiangsu210023 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China

Accurately quantifying spatiotemporal variations in evapotranspiration (ET) and its components on Tibetan Plateau (TP) is crucial for understanding the regional water cycle and energy balance. However, the determinant of spatial variations in ET and its component processes in grassland ecosystems of TP remain unclear. In this study, we used 14 sites observation data and applied Shuttleworth-Wallace-Hu (SWH) model to investigate the spatial relationships between ET, its components, and influencing factors. Our results highlighted the good performance of SWH model. There were corresponding drops in ET on alpine meadow and on alpine steppe. And the ratio of ET and precipitation (ET/PPT) of most sites was less than 1 in alpine meadow. Furthermore, the ratio of transpiration (T) and ET (T/ET) in alpine meadow generally exceeded that in alpine steppe. PPT emerged as the primary driver of interannual spatial variations in ET, while LAI played a crucial role in regulating T/ET. Our results further demonstrated that in the grassland ecosystem of TP, as the aridity index increased, the ET gradually transitioned from being primarily influenced by water supply to energy demand. This transition occurred at an aridity index of 0.73 approximately. The results of this study imply that in the context of global warming, with aridity index in TP decreasing, the ET of more ecosystems will shift from energy-led to water-led. Such findings are of immense significance in enhancing our understanding of the intricate interactions of the water cycle between land and the atmosphere. © 2023, The Authors. All rights reserved.

关键词： Water supply

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Corrigendum to “Spectra-phenology integration for high-resolution, accurate, and scalable mapping of foliar functional traits using time-series Sentinel-2 data” [Remote Sensing of Environment 305 (2024) 114082]

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Remote Sensing of Environment 2024年 307卷

作者： Shuwen Liu Zhihui Wang Ziyu Lin Yingyi Zhao Zhengbing Yan Kun Zhang Marco Visser Philip A. Townsend Jin Wu School of Biological Sciences The University of Hong Kong Pokfulam Hong Kong China Guangdong Provincial Key Laboratory of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of Geography Guangdong Academy of Sciences Guangzhou 510070 China State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Xiangshan Beijing China Institute of Environmental Sciences Leiden University Einsteinweg 2 2333 CC Leiden the Netherlands Department of Forest and Wildlife Ecology University of Wisconsin-Madison 1630 Linden Drive Madison WI 53706 USA Institute of Climate and Carbon Neutrality The University of Hong Kong Pokfulam Hong Kong China

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Adaptive Dynamic Surface Control of Constrained Nonlinear systems

Adaptive Dynamic Surface Control of Constrained Nonlinear Sy...

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第32届中国控制与决策会议

作者： Ailiang Xing Biao Song Yixin Yin School of Automation and Electrical Engineering University of Science and Technology Beijing Key Laboratory of Knowledge Automation for Industrial Processes Ministry of Education Demonstration and Research Department of Network Information System Beijing Institute of Computer Application

This paper presents an adaptive dynamic surface control for uncertain nonlinear strict feedback systems with constraints on both input and *** technology is employed in the controller *** performance method with asymmetric barrier Lyapunov function(BLF) is used to deal with the output *** input saturation is solved by using the Nussbaum *** dynamic surface control(DSC) technique is employed to reduce the complexity of the virtual *** is illustrated that all closed-loop signals are semi-global uniformly ultimately bounded(SGUUB).Finally,a simulation example proves the proposed results.

关键词： Input saturation Output constraints Nussbaum function Dynamic surface control

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Temporal and spatial evolution patterns and prediction of drought in China in recent 500 years

Research Square

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Research Square 2021年

作者： Guo, Bing Zhang, Rui Zang, Wenqian Lu, Yuefeng Meng, Chao Zhang, Dafu Zhen, Xiaoyan Geomatics Technology and Application key Labor1atory of Qinghai Province Xining810001 China School of Civil Architectural Engineering Shandong University of Technology Shandong Zibo255000 China Key Laboratory of National Geographic Census and Monitoring Ministry of Natural Resources Wuhan430072 China Key Laboratory of Land use MNR China Land Survey and Planning Institute Beijing100035 China Key Laboratory for Digital Land and Resources of Jiangxi Province East China University of Technology Nanchang330013 China MOE Key Laboratory of Western China’s Environmental System Lanzhou University Gansu Lanzhou730000 China Aerospace Information Research Institute Chinese Academy of Sciences Beijing100101 China Key Laboratory of Meteorology and Ecological Environment of Hebei Province Hebei Shijiazhuang050021 China

Drought is a prominent disaster in Chinese history. Analysing the spatial and temporal evolution laws of drought could provide decision supports for drought prevention and control. However, fewer studies were applied to investigate the long-term evolution rules of drought events on different spatial and temporal scales. In this paper, the spatio-temporal changes patterns of drought in China were analysed with geostatistical methods based on the 1470–2000a drought datasets in China, and then the possible future drought trend was predicted. Results showed that:(1) The drought risk in the northern region was the highest during the past 500 years. And, the drought intensity index showed an overall increasing trend with detail pattern of weakening->strengthening-> weakening-> strengthening;(2) The drought condition in the north was server than that in the south, but the drought trend in the south was significantly aggravated. (3) The drought gravity centres were mainly distributed in the north, but it showed a tendency to move southward. (4) From 1470 to 2000, the study area showed a significant drought enhancements, which was predicted to show an increasing trend of drought after 2000. © 2021, CC BY.

关键词： Drought

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Beyond triplet loss: Meta prototypical N-tuple loss for person re-identification

arXiv

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arXiv 2020年

作者： Zhang, Zhizheng Lan, Cuiling Zeng, Wenjun Chen, Zhibo Chang, Shih-Fu The CAS Key Laboratory of Technology in Geo-Spatial Information Processing and Application System University of Science and Technology of China Anhui Hefei China Microsoft Research Asia Beijing China Columbia University New YorkNY United States

Person Re-identification (ReID) aims at matching a person of interest across images. In convolutional neural network (CNN) based approaches, loss design plays a vital role in pulling closer features of the same identity and pushing far apart features of different identities. In recent years, triplet loss achieves superior performance and is predominant in ReID. However, triplet loss considers only three instances of two classes in per-query optimization (with an anchor sample as query) and it is actually equivalent to a two-class classification. There is a lack of loss design which enables the joint optimization of multiple instances (of multiple classes) within per-query optimization for person ReID. In this paper, we introduce a multi-class classification loss, i.e., N-tuple loss, to jointly consider multiple (N) instances for per-query optimization. This in fact aligns better with the ReID test/inference process, which conducts the ranking/comparisons among multiple instances. Furthermore, for more efficient multi-class classification, we propose a new meta prototypical N-tuple loss. With the multi-class classification incorporated, our model achieves the state-of-the-art performance on the benchmark person ReID datasets. Copyright © 2020, The Authors. All rights reserved.

关键词： Classification (of information)

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An Energy Efficient Carry-Free Inner Product Unit

An Energy Efficient Carry-Free Inner Product Unit

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2019 IEEE International Conference on Signal, information and Data Processing, ICSIDP 2019

作者： Yan, Wen Ercegovac, Milos D. Key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences Beijing China University of California Computer Science Department Los AngelesCA United States

ISBN: (纸本)9781728123455

An energy efficient truncated inner product unit is proposed in this paper. The proposed unit is pipelined and processes the m pairs of n-bit operands in serial, so that only one unit is required and it can be reused in each recurrence. Truncated inner product is produced so that no accumulation is needed for the lower part. The array reduction unit is bit-level pipelined to improve throughput and reduce the initial delay. A two-level [4:2] adder is proposed to accumulate redundant vectors with non-uniform input arrival. The proposed inner product is compared with other truncated inner product units using fully merged arithmetic, partially merged arithmetic and the counter based inner product for different precision and vector length. Our proposed inner product unit has significant reduction in area, power and energy. © 2019 IEEE.

关键词： Pipelines

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Mid-infrared Q-switch performance of ZrC

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Photonics Research 2020年第12期8卷 1857-1861页

作者： YANGYANG LIANG TAO LI WENCHAO QIAO TIANLI FENG SHENGZHI ZHAO YUEFENG ZHAO YUZHI SONG CHRISTIAN KRÄNKEL China Key Laboratory of Laser&Infrared System(Shandong University) Ministry of EducationQingdao 266237China School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and ApplicationShandong UniversityQingdao 266237China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China School of Physics and Electronics Shandong Normal UniversityJinan 250358China Leibniz-lnstitut fur Kristallzuchtung 12489 BerlinGermany

Zirconium carbide(ZrC)with layered structure and nanoparticle morphology was prepared by sonication in an ethyl alcohol *** morphology and saturable absorption properties of the ZrC were systematically *** using ZrC nanoparticle coated substrates as saturable absorbers,stable Q-switched 3μm Er:Lu_(2)O_(3) lasers were *** durations of 50 ns with pulse energies of 20μJ and peak power of 0.4 kW are the shortest obtained with novel-material-based Q-switched lasers in the 3μm wavelength range.

关键词： switched absorber shortest

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Regime shift to extensive valley glaciations over High Mountain Asia during the Early-Middle Pleistocene

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Nature Communications 2025年第1期16卷 1-12页

作者： Qing Yan Xiaohan Kong Jinzhe Zhang Lewis A. Owen Ting Wei Philip D. Hughes Nanxuan Jiang Zhongshi Zhang Huijun Wang State Key Laboratory of Earth System Numerical Modeling and Application/Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of Marine Earth and Atmospheric Science North Carolina State University Raleigh NC USA State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing China Department of Geography School of Environment Education and Development University of Manchester Manchester UK Climate Change Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of Atmospheric and Oceanic Sciences School of Physics Peking University Beijing China State Key Laboratory of Climate System Prediction and Risk Management Nanjing University of Information Science and Technology Nanjing China Key Laboratory of Meteorological Disaster/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing China

In contrast to the well-established onset of Northern Hemisphere high-latitude glaciation at ~2.7 Ma, the timing and drivers of the intensified glaciation over High Mountain Asia (HMA) remain elusive, as glacial geologic evidence within this region is inherently fragmentary. Here, we offer a spatiotemporally complete view of glacier behavior over HMA spanning the last 3 Ma using transient climate-glaciation simulations to address this challenge. We illustrate that intensified glaciations with expanded ice caps and widespread valley glaciation began at ~0.9 Ma over the monsoonal-influenced southern HMA confirmed by the glacial sediments, whereas the intensification started earlier (~1.5 Ma) over the westerly-influenced western HMA, with a further intensification at ~1.0–0.9 Ma, supported by paleoenvironmental proxies. The intensification of glaciation masks obvious shifts in the amplitude and pacing of glacier variability (e.g., the establishment of the 100-ka cycle) and induces larger environmental perturbations, which are in line with geologic evidence and largely linked with the long-term global cooling during the mid-Pleistocene transition.

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MOUNTAINOUS REMOTE SENSING IMAGES REGISTRATION BASED on IMPROVED OPTICAL FLOW ESTIMATION 4

MOUNTAINOUS REMOTE SENSING IMAGES REGISTRATION BASED on IMPR...

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4th ISPRS geospatial Week 2019

作者： Feng, R. Li, X. Shen, H. School of Resource and Environmental Sciences Wuhan University China School of Remote Sensing and Information Engineering Wuhan University China Collaborative Innovation Center of Geospatial Technology Wuhan University China Key Laboratory of Geographic Information System Ministry of Education Wuhan University China

Mountainous remote sensing images registration is more complicated than in other areas as geometric distortion caused by topographic relief, which could not be precisely achieved via constructing local mapping functions in the feature-based framework. Optical flow algorithm estimating motion of consecutive frames in computer vision pixel by pixel is introduced for mountainous remote sensing images registration. However, it is sensitive to land cover changes that are inevitable for remote sensing image, resulting in incorrect displacement. To address this problem, we proposed an improved optical flow estimation concentrated on post-processing, namely displacement modification. First of all, the Laplacian of Gaussian (LoG) algorithm is employed to detect the abnormal value in color map of displacement. Then, the abnormal displacement is recalculated in the interpolation surface constructed by the rest accurate displacements. Following the successful coordinate transformation and resampling, the registration outcome is generated. Experiments demonstrated that the proposed method is insensitive in changeable region of mountainous remote sensing image, generating precise registration, outperforming the other local transformation model estimation methods in both visual judgment and quantitative evaluation. © Authors 2019.

关键词： Optical flows

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Torque work of origin-destination flows: Quantifying urban place centrality from a physical perspective

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Computers, Environment and Urban systems 2025年 121卷

作者： Xiaorui Yan Tao Pei Ci Song Zidong Fang Xiaohan Liu Tianyu Liu Linfeng Jiang Ying Gao Guangdong Li Jie Huang Yaqin Sun State Key Laboratory of Resources and Environmental Information System Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing China College of Earth and Environmental Sciences Lanzhou University Lanzhou China Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China School of Environment and Spatial Informatics China University of Mining and Technology Xuzhou China

Quantifying urban place centrality, defined as its relative importance in serving its peripheral areas, provides insights into urban structures, optimizes resource allocation, and supports strategic urban planning. Centrality is shaped by three aspects: service volume, spatial reach, and directional diversity. However, existing measures often assess these factors separately and few integrate them simultaneously. Additionally, centrality analyses often overlook local perspectives and intra-day dynamics. To this end, we propose a novel origin-destination flow-based centrality measure, namely Total Torque Work (TTW), that integrates these three aspects into a single value, conceptualized as “Torque work of flow”, where flow volume, length, and direction correspond to the force magnitude, lever arm, and angular displacement. The effectiveness of the TTW is validated by simulation experiments. We apply this measure to analyze macro- and micro-centralities in Beijing, using taxi and shared bike flow data. Macro-centrality shows a monocentric structure, with higher values near railway stations, airports, and business and commercial centers. Micro-centrality is more polycentric, with subway stations exhibiting higher centrality. Time series clustering identifies three temporal patterns in both macro- and micro-centralities: two “daytime-dominant” patterns linked to multifunctional activities and commuting, and a “nighttime-dominant” pattern in residential areas. The study concludes with several implications for urban planning, emphasizing the importance of incorporating multi-spatiotemporal scales.

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