240 Result(s)
within
Qi** Zhai
Earth Sciences, general
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Article
Bivariate attribution of the compound hot and dry summer of 2022 on the Tibetan Plateau
The extraordinarily high temperatures experienced during the summer of 2022 on the Tibetan Plateau (TP) demand attention when compared with its typical climatic conditions. The absence of precipitation alongsi...
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Article
Sea-land segmentation method based on an improved MA-Net for Gaofen-2 images
This paper proposes EMA-Net, a fully convolutional neural network, to improve the effectiveness of sea-land segmentation on Gaofen-2 images. The aim is to address the issue of low segmentation accuracy in sea-...
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Article
Phase Equilibria of the CaO-SiO2-CeO2-Al2O3-MgO System at 1300°C and 1400°C
The recovery of rare-earth elements (REEs) from rare-earth blast furnace slag (RE-BFS) is crucial for advancing the circular economy. However, the development of related processes is significantly hindered by ...
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Article
Open AccessCombined algorithms of high-frequency topographical effects for the boundary-value problems based on Helmert's second condensation method
The Helmert’s second condensation method is usually used to condense the topographical masses outside the boundary surface in the determination of the geoid and quasi-geoid based on the boundary-value theory. ...
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Article
Extraction of maize canopy temperature and variation factor analysis based on multi-source unmanned aerial vehicle remote sensing data
Canopy temperature is an important parameter for monitoring the physiological status of maize. The study of its change law can help to improve the growth environment and increase the yield and quality. Based o...
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Article
Numerical Analysis of Surcharge Effect on Stability and Interaction Mechanism of Slope-Pile-Footing System
To investigate the stability and interaction mechanism of the slope-pile-footing system under surcharge effects, the finite difference method (FDM) was adopted to analyze the response laws of the stability of ...
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Article
Dual-color space color correction and histogram segmentation optimized strategy for underwater image enhancement
Underwater images are affected by light scattering and absorption in the water. It usually faces challenges such as color distortion, loss of details, and low contrast. To address the above problems, this pape...
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Article
Open AccessComplexities of peroxyacetyl nitrate photochemistry and its control strategies in contrasting environments in the Pearl River Delta region
Peroxyacetyl nitrate (PAN) is a hazardous secondary pollutant and a nitrogen reservoir in the troposphere, while comprehensive studies on its spatiotemporal distribution, chemical sources, and control strategi...
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Article
Open AccessCharacteristics of temporal variability of long-duration bursts of high-energy radiation associated with thunderclouds on the Tibetan plateau
From 1998 to 2017, neutron monitors located at an altitude of 4300 m on the Tibetan plateau detected 127 long-duration bursts of high-energy radiation in association with thunderclouds. These bursts typically ...
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Article
Surface water resource attenuation attribution and patterns in Hai River Basin
From 1956 to 2016, Hai River Basin suffered the most severe surface water resource attenuation among the 10 first-class river basins in China. Based on the surface water circulation process, and evolving chara...
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Article
Optimizing identification of mine water inrush source with manifold reduction and semi-supervised learning using improved autoencoder
To enhance the accuracy of identifying water sources in mine inrush incidents, this study, taking the Shengquan coal mine in Shandong, China, as a case study, proposes a novel water source identification model...
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Article
Refinement of Large Primary Carbides by Adjusting Annealing Parameters in 45Cr9Si3 Valve Steel
Large carbides (> 20 µm) in 45Cr9Si3 valve steel can be effectively refined by promoting the annealing temperature to an appropriate region based on carbide determination. The carbides of electroslag remelting...
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Article
Pre-Cryogenian integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas
The composition and geological evolution of pre-Cryogenian material in the Tibetan Plateau and its surrounding areas have played an important role in studying the formation and evolution of early supercontinen...
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Article
Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions
Carbonates are viewed as the principal oxidized carbon carriers during subduction, and thus the stability of subducted carbonates has significant implications for the deep carbon cycle. Here we investigate the...
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Article
Bayesian probabilistic characterization of the shear-wave velocity combining the cone penetration test and standard penetration test
The shear-wave velocity \({V}_{S}\) V S ...
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Article
Open AccessAn intercomparison of weather normalization of PM2.5 concentration using traditional statistical methods, machine learning, and chemistry transport models
Traditional statistical methods (TSM) and machine learning (ML) methods have been widely used to separate the effects of emissions and meteorology on air pollutant concentrations, while their performance compa...
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Article
Carbon Isotope from Shallow Marine System in North China: Implications for Stratigraphical Correlation and Sea-Level Changes in Cambrian
Cambrian System at the Shatan Section in northern Henan, North China, consists of sedimentary successions of tidal flat and shallow-water carbonate platform facies. Data of carbon isotope (δ13Ccarb) from this sec...
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Article
Open AccessTransient vegetation degradation reinforced rapid climate change (RCC) events during the Holocene
High-resolution multi-proxies from geological archives have revealed a series of rapid climate change (RCC) events during the Holocene. These events coincided with the so-called “Bond events”, which were previ...
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Article
In-Situ X-Ray Imaging High Strain Rate Compression of Laminate Al-Graphene Composite and Mechanical Property Characterization
Owing to the opaque nature of the laminated structures, traditional high-speed optical camera cannot be used to detect the dynamic process of sub-surface deformation. In this article, we report a study of usin...
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Article
Microstructure and Mechanical Behavior of DP600 Welded Joints Obtained by Fiber Laser Welding
To study the welding performance of DP600 steel, the welding test with five different laser welding processes and the microstructures, microhardness distribution, and tensile behavior of DP600 steel and welded...
