检索结果-内蒙古大学图书馆

Permafrost‒vegetation controls on water availability over the Qinghai‒Tibet Plateau

Advances in Climate Change Research 2025年

作者： Ji, Fang Fan, Lin-Feng Yuan, Shan-Shui Kuang, Xing-Xing Zhu, Liu-Jun Jin, Jun-Liang Yao, Ying-Ying Zhang, Jian-Yun Zheng, Chun-Miao The National Key Laboratory of Water Disaster Prevention Hohai University Nanjing 210024 China Yangtze Institute for Conservation and Development Hohai University Nanjing 210024 China Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610213 China Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources Hohai University Nanjing 210024 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Department of Earth and Environmental Science School of Human Settlements and Civil Engineering Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing 210029 China Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo 315200 China

Permafrost degradation substantially affects water resources within the cryosphere. It is crucial to elucidate the dynamics of water availability influenced by both permafrost degradation and climate change to fully comprehend the water cycle in cold regions, such as the Qinghai‒Tibet Plateau (QTP). While existing studies have established the hydrological consequences of permafrost degradation through altered soil hydraulics and water storage capacity, the complex interplay between thawing permafrost and vegetation dynamics—particularly their synergistic regulation of precipitation partitioning and runoff generation through root-zone water accessibility—are poorly understood, creating critical knowledge gaps in predicting long-term water availability trajectories. In this study, we explore the influence of permafrost-vegetation interactions on regional water availability on the QTP by integrating the effects of permafrost degradation on vegetation into the Budyko-Fu model. Our results reveal a consistent increase in surface runoff (R) of the permafrost regions from 1981 to 2100, predominantly driven by rising precipitation. However, shifts in vegetation patterns, prompted by permafrost degradation, significantly modify hydrological partitioning, leading to non-monotonic variations in the runoff to precipitation ratio (R/P). Notably, early-stage permafrost thaw enhances vegetation growth and evapotranspiration, which results in a decrease in R/P. Conversely, deeper permafrost thaw (e.g., beyond the root zone of vegetation) can lead to vegetation degradation, which subsequently reduces evapotranspiration and consequently increasing the R/P ratio. These findings underscore the pivotal role of vegetation in regulating the hydrological cycle and affecting water availability in permafrost-affected regions. © 2025 The Authors

关键词： Climate change Permafrost degradation Qinghai‒Tibet Plateau Vegetation Water availability

来源：评论

学校读者我要写书评

暂无评论

Thermodynamically constrained retrieval algorithm to estimate subpixel fire properties

引用

Remote Sensing of Environment 2025年 328卷

作者： Chenchong Zhang Yuan Wang Jun Wang Amber Soja Emily Gargulinski David Peterson Olga Kalashnikova Bin Zhao Yafang Cheng Fangjun Li Rajan Chakrabarty Department of Earth System Science Stanford University Stanford CA 94305 USA Department of Chemical and Biochemical Engineering University of Iowa Iowa City IA 52242 USA Center for Global and Regional Environmental Research and Iowa Technology Institute University of Iowa Iowa City IA 52242 USA NASA Langley Research Center Hampton VA 23666 USA National Institute of Aerospace Hampton VA 23666 USA Marine Meteorology Division US Naval Research Laboratory Monterey CA 93943 USA Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91125-0002 USA State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Max Planck Institute for Chemistry Mainz 55128 Germany Geospatial Sciences Center of Excellence Department of Geography and Geospatial Sciences South Dakota State University Brookings SD 57007 USA Department of Energy Environmental and Chemical Engineering Washington University in St. Louis St. Louis MO 63130-4899 USA

Satellite-based measurements have been widely used for estimating fire-emitted pollutants based on the parameters of either burned area or fire radiative power (FRP). Fire-related remote sensing additionally requires information on active fire areas and fire temperature at a subpixel scale, as well as the combustion phases (i.e., smoldering and flaming) to infer the plume injection height and to understand the mechanics of resulting atmospheric processes like pyro-convection. The FRP is as a key indicator of fire intensity that is frequently retrieved using infrared signals. The fire properties at a subpixel level, including the effective fire temperature and fire area, can be retrieved by the bi-spectral method. However, these approaches normally neglect the heat transport phenomena and subsequently fail to characterize the fire area that could be composed of different combustion phases (e.g. smoldering, flaming, or a combination of the two). Neglecting the phenomena of heat transfer leads to mis-estimation of the actual fire area and its associated emission profile for combustion products that are a function of the combustion phase. To address this challenge, this work presents a new approach to resolve the effective temperature variation inside each fire pixel using a semi-empirical heat-transfer algorithm. This algorithm utilizes radiance observations from geostationary satellites as inputs. With the aid of fine-spatial-resolution spaceborne and airborne observations, we evaluated and validated the fire retrieval performance on western US wildfires corresponding to the 2019 season. Our results show that FRP obtained through this heat-transfer method exhibits a stronger linear correlation with those retrieved from airborne measurements. Moreover, by analyzing the temperature variation curve obtained using this method, it is possible to further retrieve the fire area under different combustion conditions within the fire pixels.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Numerical detection of Gaussian entanglement and its application to the identification of bound entangled Gaussian states

arXiv

引用

arXiv 2020年

作者： Ma, Shan Xue, Shibei Guo, Yu Shu, Chuan-Cun School of Automation Central South University Changsha410083 China Peng Cheng Laboratory Shenzhen518000 China Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering School of Physics and Electronic Science Changsha University of Science and Technology Changsha410114 China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China

We present a numerical method for solving the separability problem of Gaussian quantum states in continuous-variable quantum systems. We show that the separability problem can be cast as an equivalent problem of determining the feasibility of a set of linear matrix inequalities. Thus, it can be efficiently solved using existent numerical solvers. We apply this method to the identification of bound entangled Gaussian states. We show that the proposed method can be used to identify bound entangled Gaussian states that could be simple enough to be producible in quantum optics. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum optics

来源：评论

学校读者我要写书评

暂无评论

Analysis of Harmonics Detection and their Filtration by using Active Band Pass Filter for Domestic Appliances

Analysis of Harmonics Detection and their Filtration by usin...

引用

IEEE International Conference on automation Science and engineering (CASE)

作者： Ehtisham Lodhi Zeeshan Lodhi Zhu Fenghua Gang Xiong Feiyue Wang Waheed ur Rehman Tariku Sinshaw The SKL for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad Campus Pakistan Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan Guangdong China Beijing Engineering Research Center of Intellectual System and Technology Chinese Academy of Sciences Beijing China College of Mechanical Engineering and Applied Electronics Technologies Beijing University of Technology Beijing China

ISBN: (数字)9781728169040

ISBN: (纸本)9781728169057

In modern era, one of the rising power quality (PQ) concern is harmonics distortion (HD). The HD is usually produced by increase in the utilization of nonlinear user loads at domestic level. It not only spoils the PQ but also have harmful effects on electrical appliances. So, this paper presents a new approach to mitigate the HD in home appliances rapidly by utilizing the active band pass filter (ABPF). The fast Fourier transform (FFT) technique is employed for the detection of harmonics in appliances. The band pass filter dramatically affects the response time of active filter. The suggested control methodology is capable to eliminate harmonics from distorted input voltage waveform and provides a pure sinusoidal waveform. The prototype of this model is also implemented. Experimental results along with simulation show that the proposed model is quite effective in eliminating HD despite load variations and also useful to compensate the reactive power in electronic home appliances. Hence, this technique is cost effective for domestic users with high quality performance in all aspects.

关键词： Power harmonic filters Harmonic analysis Band-pass filters Harmonic distortion Home appliances

来源：评论

学校读者我要写书评

暂无评论

Quantum hamiltonian identification with classical colored measurement noise

arXiv

引用

arXiv 2019年

作者： Tan, Lingyu Dong, Daoyi Li, Dewei Xue, Shibei Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China School of Engineering and Information Technology University of New South Wales CanberraACT2600 Australia

In this paper, we present a Hamiltonian identification method for a closed quantum system whose time trace observables are measured with colored measurement noise. The dynamics of the quantum system are described by a Liouville equation which can be converted to a coherence vector representation. Since the measurement process is disturbed by classical colored noise, we introduce an augmented system model to describe the total dynamics, where the classical colored noise is parameterized. Based on the augmented system model as well as the measurement data, we can find a realization of the quantum system with unknown parameters by employing an Eigenstate Realization Algorithm. The unknown parameters can be identified using a transfer-function-based technique. An example of a two-qubit system with colored measurement noise is demonstrated to verify the effectiveness of our method. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum optics

来源：评论

学校读者我要写书评

暂无评论

Publisher Correction: Ozone pollution mitigation strategy informed by long-term trends of atmospheric oxidation capacity

引用

Nature Geoscience 2024年 172页

作者： Wenjie Wang Xin Li Ying Liu Sihua Lu Yusheng Wu Shiyi Chen Keding Lu Min Hu Limin Zeng Min Shao Yuanhang Zhang Hang Su Yafang Cheng Ruijing Ni Ulrich Pöschl Zhaofeng Tan Franz Rohrer Andreas Wahner David D. Parrish Cheng Huang Xudong Tian K. M. Leung Liangfu Chen Meng Fan Qiang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing China State Key Laboratory of Atmospheric Environment and Extreme Meteorology Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Max Planck Institute for Chemistry Mainz Germany International Joint Laboratory for Regional Pollution Control Ministry of Education Beijing China Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology Nanjing University of Information Science & Technology Nanjing China Institute of Carbon Neutrality Peking University Beijing China Institute for Environmental and Climate Research Jinan University Guangzhou China State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai China Institut für Energie-und Klimaforschung: Troposphäre (IEK-8) Forschungszentrum Jülich Jülich Germany Key Laboratory of Ecological and Environmental Monitoring Forewarning and Quality Control of Zhejiang Zhejiang Ecological and Environmental Monitoring Center Hangzhou China Environmental Protection Department The Government of the Hong Kong Special Administrative Region Hong Kong China State Key Laboratory of Remote Sensing Science The Aerospace Information Research Institute Chinese Academy of Sciences Beijing China Department of Earth System Science Tsinghua University Beijing China

来源：评论

学校读者我要写书评

暂无评论

Research on a New Hysteresis control Technology for Flexible High-voltage Direct Current Transmission

Research on a New Hysteresis Control Technology for Flexible...

引用

2018 3rd International Conference on Computer Science and Information engineering(ICCSIE 2018)

作者： Dian Zhang Qingliang Qin Bo Wang College of Automation & Electronic Engineering Qingdao University of Science & Technology Engineering Department China National Automation Control System Corp.

The nearest level approximation control algorithm(nlm) is employed for multi-level multi-module(mmc) in the flexible high-voltage direct current(hdvc) *** decimal part of this algorithm needs to input sine digital pulse width modulator(dpwm),however,since the dpwmis too sensitive and less stable,the output digital pulse becomes too narrow and the digital signal frequency changes too *** order to solve the multilevel problems of the inverter frequency operation,the hysteretic Schmidt comparison method is proposed to meet the requirement of *** method can not only ensure the stability of the output digital signal,but also can adjust the hysteretic Schmidt trigger threshold,obtain more ideal digital pulse width which reduces the digital signal output frequency and make digital output signals stable and the pulse width,the grading sorting algorithm and guarantee the reduction of the output control pulse *** feasibility of the method is verified through simulation and the actual running results of this method in field-programmable gate array(fpga) show that the study of nlm control algorithm can optimize the flexible hvdc control requirements.

关键词： high-voltage direct current hysteresis control triangular carrier wave

来源：评论

学校读者我要写书评

暂无评论

Feedback control of a non-Markovian single qubit system 11

Feedback control of a non-Markovian single qubit system

引用

2017 11th Asian control Conference, ASCC 2017

作者： Xue, Shibei Nguyen, Thien Petersen, Ian R. Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Research School of Engineering Australian National University CanberraACT2600 Australia

ISBN: (纸本)9781509015733

In this paper, we utilize a feedback strategy to stabilize a single qubit in a non-Markovian environment with a Lorentzian spectrum. The non-Markovian single qubit is represented in an augmented system model, where an ancillary system is introduced as the internal mode of the environment to generate Lorentzian noise. The density matrix of the single qubit can be estimated by using an augmented-system-based quantum stochastic master equation. Then a feedback controller can be driven by the estimates to stabilize the qubit in a target state. Simulations show the feedback strategy can provide effective control of the non-Markovian single qubit. © 2017 IEEE.

关键词： Feedback control

来源：评论

学校读者我要写书评

暂无评论

Research on Secondary State Monitoring system of Intelligent Substation Based on Big Data 2

Research on Secondary State Monitoring System of Intelligent...

引用

2nd IEEE International Electrical and Energy Conference, CIEEC 2018

作者： Zhang, Yi Zheng, Yongkang Jiao, Kunlin Li, Dazhong Jiang, Hua Wang, Xiaotao Department of Relay Protection and Automation Sichuan Electric Power Research Institute Chengdu China Collage of Control Engineering North China Electric Power University Baoding China Aba Power Company Sichuan Electric Power Company Aba China

ISBN: (纸本)9781538653913

Through the research and analysis of intelligent substation secondary state monitoring system, we realize that intelligent substation huge secondary state online monitoring information system, we cannot effectively store and read and write in the shared information of intelligent substation. In this context, we first discuss the network architecture of the secondary system of the intelligent substation, and then analyze the monitoring concept and the specific monitoring signal of the secondary state of the intelligent substation. Finally, in order to solve the problem of processing the massive data of the intelligent substation, the analysis and summary are based on the advantages of Hadoop data processing platform and the application of big data in smart substation. © 2018 IEEE.

关键词： Big data

来源：评论

学校读者我要写书评

暂无评论

Contraction analysis on primal-dual gradient optimization

arXiv

引用

arXiv 2019年

作者： Su, Yanxu Shi, Yang Sun, Changyin School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of Education Southeast University Nanjing210096 China Department of Mechanical Engineering University of Victoria VictoriaBCV8W 3P6 Canada

This paper analyzes the contraction of the primaldual gradient optimization via contraction theory in the context of discrete-time updating dynamics. The contraction theory based on Riemannian manifolds is first established for convergence analysis of a convex optimization algorithm. The equality and inequality constrained optimization cases are studied, respectively. Under some reasonable assumptions, we construct the Riemannian metric to characterize a contraction region. It is shown that if the step-sizes of the updating dynamics are properly designed, the convergence rates for both cases can be obtained according to the contraction region in which the convergence can be ***, the augmented Lagrangian function which is projection free is adopted to tackle the inequality constraints. Some numerical experiments are simulated to demonstrate the effectiveness of the presented contraction analysis results on primal-dual gradient optimization algorithm. Copyright © 2019, The Authors. All rights reserved.

关键词： Convex optimization

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：