Results 21 to 30 of about 181,239 (315)

Distribution of Artisanal and Small-Scale Gold Mining in the Tapajós River Basin (Brazilian Amazon) over the Past 40 Years and Relationship with Water Siltation

open access: yesRemote Sensing, 2016
An innovative remote sensing approach that combines land-use change and water quality information is proposed in order to investigate if Artisanal and Small-scale Gold Mining (ASGM) area extension is associated with water siltation in the Tapajós River ...
Felipe de Lucia Lobo   +3 more
doaj   +1 more source

Joint Sparse Representation Hyperspectral Image Classification Based on Independent Space-spectrum Residual Fusion [PDF]

open access: yesJisuanji gongcheng, 2019
Aiming at the problem of spatial information and spectral information fusion in hyperspectral image classification,a joint sparse representation hyperspectral image classification algorithm based on independent space-spectrum residual fusion is proposed ...
LU Jia,BAO Wenxing
doaj   +1 more source

Distributed nonstationary control system synthesis on a basis of spectral representation in space-time domain

open access: yesВестник Самарского государственного технического университета. Серия: Технические науки, 2022
It is proposed, based on the spectral representation of the system, to solve the problem of synthesis of a distributed control plant described by PDE, using LMI technique. The system is described by a spectral characteristic vector with the amplitudes of
Vladimir A. Koval’   +2 more
doaj   +1 more source

On the second spectrum of lattice modules

open access: yesDiscussiones Mathematicae - General Algebra and Applications, 2017
The second spectrum Specs(M) is the collection of all second elements of M. In this paper, we study the topology on Specs(M), which is a generalization of the Zariski topology on the prime spectrum of lattice modules. Besides some properties, Specs(M) is
Phadatare Narayan   +2 more
doaj   +1 more source

Effects of Small-Scale Gold Mining Tailings on the Underwater Light Field in the Tapajós River Basin, Brazilian Amazon

open access: yesRemote Sensing, 2017
Artisanal and Small-scale Gold Mining (ASGM) within the Amazon region has created several environmental impacts, such as mercury contamination and changes in water quality due to increased siltation. This paper describes the effects of water siltation on
Felipe de Lucia Lobo   +3 more
doaj   +1 more source

An Explicit–Implicit Spectral Element Scheme for the Nonlinear Space Fractional Schrödinger Equation

open access: yesFractal and Fractional, 2023
In this paper, we solve the space fractional nonlinear Schrödinger equation (SFNSE) by developing an explicit–implicit spectral element scheme, which is formulated based on the Legendre spectral element approximation in space and the Crank–Nicolson leap ...
Zeting Liu, Baoli Yin, Yang Liu
doaj   +1 more source

Ground-Based Doppler Asymmetric Spatial Heterodyne Interferometer: Instrument Performance and Thermospheric Wind Observations

open access: yesRemote Sensing
The thermosphere serves as a pivotal region for Sun–Earth interactions, and thermospheric winds are of great scientific importance for deepening insights into atmospheric dynamics, climate formation mechanisms, and space environment evolution. This study
Zhenqing Wen   +8 more
doaj   +1 more source

Numerical Simulation of a Space-Fractional Molecular Beam Epitaxy Model without Slope Selection

open access: yesFractal and Fractional, 2023
In this paper, we introduce a space-fractional version of the molecular beam epitaxy (MBE) model without slope selection to describe super-diffusion in the model. Compared to the classical MBE equation, the spatial discretization is an important issue in
Hyun Geun Lee
doaj   +1 more source

G-domains and spectral spaces

open access: yesJournal of Pure and Applied Algebra, 1988
Ein Integritätsbereich R heißt G-Bereich, wenn der Durchschnitt p(R) aller Primideale \(\neq 0\) selbst vom Nullideal verschieden ist. Ein G-Bereich R wird wesentlich genannt, wenn jedes Primideal \(\neq 0\) in der Vereinigung V aller Primideale der Höhe Eins enthalten ist. Mit \(S=R\setminus V\) ist dann \(S^{-1}R\) ein wesentlicher G-Bereich. Jedem G-
DOBBS DE, FEDDER R, FONTANA, Marco
openaire   +3 more sources

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