Results 21 to 30 of about 10,099,680 (281)

A Risk Assessment Method of Three-Dimensional Low-Attitude Airspace Based on Multi-Source Data

ISPRS International Journal of Geo-Information
The safe operation of low-altitude UAVs is crucial for the effective utilization of low-altitude airspace, necessitating the development of appropriate risk assessment methods to evaluate the associated operational risks.
Keli Wang, Wenbin Yang, Yanru Huang, Yuhe Qiu, Wenjiang Huang, Peng Hu   +5 more
doaj   +1 more source

Cooperative ISAC-Empowered Low-Altitude Economy

IEEE Transactions on Wireless Communications
This paper proposes a cooperative integrated sensing and communication (ISAC) scheme for the low-altitude sensing scenario, aiming at estimating the parameters of the unmanned aerial vehicles (UAVs) and enhancing the sensing performance via cooperation. The proposed scheme consists of two stages.
Jun Tang, Yiming Yu, Cunhua Pan, Hong Ren, Dongming Wang 0002, Jiangzhou Wang, Xiaohu You 0001   +6 more
openaire   +3 more sources

Satellite Mapping of 30 m Time-Series Forest Distribution in Hunan, China, Based on a 25-Year Multispectral Imagery and Environmental Features

Remote Sensing
Forests play a critical role in Earth’s ecosystem, yet monitoring their long-term, large-scale spatiotemporal dynamics remains a significant challenge. This study addresses this gap by developing an integrated framework to map annual forest distribution ...
Rong Liu, Gui Zhang, Aibin Chen, Jizheng Yi   +3 more
doaj   +1 more source

Inhibitory mechanism of an aluminophosphate phase change material on early hydration of cement✰

KSCE Journal of Civil Engineering
In this investigation, in order to reveal the effects of the lab-prepared aluminophosphate phase change material (PCMP-Al) on early hydration of cement, the solubility of PCMP-Al in water and NaOH solution simulating cement paste alkalinity, was ...
Furong Gao, Yongsheng Ji, Jie Zhang, Xingyu Mou, Yan Gao   +4 more
doaj   +1 more source

Solar radiation pressure augmented deorbiting from high altitude sun-synchronous orbits [PDF]

, 2012
This paper discusses the use of solar radiation pressure (SRP) augmented deorbiting to passively remove small satellites from high altitude Sun-synchronous orbits. SRP-augmented deorbiting works by deploying a light-weight reflective inflatable device to
Colombo, Camilla, McInnes, Colin, Lucking, Charlotte   +2 more
core   +3 more sources

China's Low‐Carbon Energy Transition Over the Past Two Decades: Experiences and Implications

Advanced Science, EarlyView.
China's low‐carbon energy transition features a brief decline and subsequent rebound in coal consumption, alongside the rapid expansion of renewable energy. This study develops a stage‐based analytical framework to explain this evolution from the perspectives of economic development, energy security, and environmental sustainability, revealing how ...
Yu Liu, Zhiyu Tian, Zhengxian Zhang, Xinbei Li   +3 more
wiley   +1 more source

O²RDL-net for joint risk classification and delay forecasting in logistics systems using interaction amplified deep

Scientific Reports
Transportation and logistics systems face frequent delays and operational risks due to congestion, human factors, and rapidly changing conditions. Predicting delays and identifying risk levels in advance is therefore essential for reliable logistics ...
Xiao Yang
doaj   +1 more source

Low Latency Global Carbon Budget Reveals Late 2024 Carbon Losses and Contrasting Early 2025 Land Sink Recovery Signals

Advanced Science, EarlyView.
Low latency carbon budget estimates for July 2024–June 2025 combine atmospheric CO2 growth rates, fossil emissions, ocean uptake, DGVM land fluxes, and OCO‐2 inversions. The budget shows that late‐2024 land carbon losses dominate the annual anomaly, while early‐2025 recovery differs between bottom‐up models and top‐down inversions, especially in ...
Piyu Ke, Philippe Ciais, Yitong Yao, Stephen Sitch, Wei Li, Xiaomeng Du, Xiaofan Gui, Ben Poulter, Thomas Colligan, Auke M. van der Woude, Joram Hooghiem, Wouter Peters, Zhu Liu, Zhu Deng, Zhe Jin, Xiangjun Tian, Yilong Wang, Junjie Liu, Sudhanshu Pandey, Chris O'Dell, Jiang Bian, John Miller, Xin Lan, Jefferson Goncalves De Souza, Michael O'Sullivan, Pierre Friedlingstein, Julien Alléon, Yi Xi, Daniel S. Goll, Lei Zhu, Guido R. van der Werf, Shilong Piao, Frédéric Chevallier   +32 more
wiley   +1 more source

Shape-Regularized Meta-Learning Method for Performance Assessment of Solid Rocket Motors

Machines
During the early developmental stages of solid rocket motors (SRMs), particularly under extreme operating conditions, the scarcity of experimental data severely limits the predictive capabilities of conventional deep learning models.
Fanbin Meng, Cheng Chen, Huixin Yang
doaj   +1 more source

How Video‐Based Information Affects Farmers' Willingness to Pay for Drone Services

Applied Economic Perspectives and Policy, EarlyView.
ABSTRACT Professional service for digital technology like agricultural drones lowers transaction costs and scope thresholds for smallholders. Meanwhile, perceptual adoption barriers remain underexplored. We conduct a two‐stage choice experiment with a randomized video‐based information treatment among 384 Chinese crop farmers to measure its effect on ...
Hua Zhang, Lena Kuhn, Hang Xiong, Zhanli Sun, Thomas Glauben   +4 more
wiley   +1 more source