Results 21 to 30 of about 268,794 (217)

Ultraviolet/Optical Emission of the Ionized Gas in AGN: Diagnostics of the Ionizing Source and Gas Properties

Frontiers in Astronomy and Space Sciences, 2017
Spectroscopic studies of active galactic nuclei (AGN) are powerful means of probing the physical properties of the ionized gas within them. In particular, near future observational facilities, such as the James Webb Space Telescope (JWST), will allow ...
Anna Feltre, Anna Feltre, Stephane Charlot, Marco Mignoli, Angela Bongiorno, Francesco Calura, Jacopo Chevallard, Emma Curtis-Lake, Roberto Gilli, Adele Plat   +9 more
doaj   +1 more source

Prediction of soil organic matter and clay contents by near-infrared spectroscopy - NIRS [PDF]

Ciência Rural, 2020
: Among the soil constituents, special attention is given to soil organic matter (SOM) and clay contents, since, among other aspects, they are key factors to nutrient retention and soil aggregates formation, which directly affect the crop production ...
Bruno Pedro Lazzaretti, Leandro Souza da Silva, Gerson Laerson Drescher, André Carnieletto Dotto, Darines Britzke, José Laerte Nörnberg   +5 more
doaj   +1 more source

Structure-function models of temporal, spatial, and spectral characteristics of non-invasive whole brain functional imaging

Frontiers in Neuroscience, 2022
We review recent advances in using mathematical models of the relationship between the brain structure and function that capture features of brain dynamics. We argue the need for models that can jointly capture temporal, spatial, and spectral features of
Ashish Raj, Parul Verma, Srikantan Nagarajan   +2 more
doaj   +1 more source

Singular-spectral climate models [PDF]

E3S Web of Conferences
In this paper, the singular spectrum analysis method is used to construct data models for the Onega Lake basin: time series of air temperature, precipitation, and runoff of the Shuya, Suna, and Vodla rivers.
Belashev Boris
doaj   +1 more source

A Statistical and Spectral Model for Representing Noisy Sounds with Short-Time Sinusoids

EURASIP Journal on Advances in Signal Processing, 2005
We propose an original model for noise analysis, transformation, and synthesis: the CNSS model. Noisy sounds are represented with short-time sinusoids whose frequencies and phases are random variables.
Myriam Desainte-Catherine, Pierre Hanna   +1 more
doaj   +1 more source

Extraction of blue roofs using BRSAM and the newly created spectral index derived from WorldView-2/3 imagery

Heliyon, 2022
To extract blue roofs (BRs) from remote sensing images quickly, first, this study used WorldView-2 and WorldView-3 as the data sources and created a new BR spectral area model (BRSAM) using the polygon area difference between the spectral curves of BRs ...
Huaipeng Liu, Xiaoqing Zuo
doaj   +1 more source

Non-destructive monitoring of amylose content in rice by UAV-based hyperspectral images

Frontiers in Plant Science, 2022
Amylose content (AC) is an important indicator for rice quality grading. The rapid development of unmanned aerial vehicle (UAV) technology provides rich spectral and spatial information on observed objects, making non-destructive monitoring of crop ...
Fumin Wang, Fumin Wang, Qiuxiang Yi, Lili Xie, Xiaoping Yao, Jueyi Zheng, Tianyue Xu, Jiale Li, Siting Chen   +8 more
doaj   +1 more source

Comparison of multi-source satellite images for classifying marsh vegetation using DeepLabV3 Plus deep learning algorithm

Ecological Indicators, 2021
The accurate classification of wetland vegetation is essential for rapid assessment and management. The Honghe National Nature Reserve (HNNR), located in Northeast China, was studied.
Man Liu, Bolin Fu, Shuyu Xie, Hongchang He, Feiwu Lan, Yuyang Li, Peiqing Lou, Donglin Fan   +7 more
doaj   +1 more source

Комплекс программ моделирования геодинамо на основе спектральных эредитарных моделей

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki
Исследование задачи геодинамо часто проводят на основе спектральных моделей, когда поля задачи полностью или частично раскладываются по собственным полям (модам) подходящих спектральных задач.
Водинчар, Г.М., Казаков, Е.А., Фещенко, Л.К.   +2 more
doaj   +1 more source

Многомасштабная модель геодинамо: сопряжение крупномасштабной и мелкомасштабной подмоделей

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki
Формирование главного геомагнитного поля обеспечивается работой механизма гидромагнитного динамо — генерации магнитного поля движением проводящей среды. Динамо Земли (геодинамо) управляется конвекцией жидкого металла во внешнем ядре Земли.
Водинчар, Г.М., Фещенко, Л.К.   +1 more
doaj   +1 more source