Výsledky vyhledávání - "Ayman Abdel-Hamid"

Akademický článek

Assessing the impact of drought stress on grasslands using multi-temporal SAR data of Sentinel-1: a case study in Eastern Cape, South Africa

Autor: Ayman Abdel-Hamid, Olena Dubovyk, Valerie Graw, Klaus Greve

Publikováno v: European Journal of Remote Sensing, Vol 53, Iss S2, Pp 3-16 (2020)

Grasslands are a major component of the natural vegetation in South Africa, it covers almost one-third of the country’s land surface. The current study focuses on assessing the impact of drought stress on communal and commercial grasslands in Easte

Externí odkaz: https://doaj.org/article/8fe5e18c310c4f5d800a28966e798471

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Akademický článek

Timing is Everything–Drought Classification for Risk Assessment

Autor: Valerie Graw, Gohar Ghazaryan, Jonas Schreier, Javier Gonzalez, Ayman Abdel-Hamid, Yvonne Walz, Karen Dall, Joachim Post, Andries Jordaan, Olena Dubovyk

Publikováno v: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 428-433 (2020)

Drought is one of the most severe natural disasters with a high risk for human livelihoods. Remote sensing based drought indices can identify dry periods using, e.g., precipitation or vegetation information. Besides frequency, duration, and intensity

Externí odkaz: https://doaj.org/article/2f4480f02ce24957a70a964a0b01b1a1

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Akademický článek

The potential of sentinel-1 InSAR coherence for grasslands monitoring in Eastern Cape, South Africa

Autor: Ayman Abdel-Hamid, Olena Dubovyk, Klaus Greve

Publikováno v: International Journal of Applied Earth Observations and Geoinformation, Vol 98, Iss , Pp 102306- (2021)

This study evaluates the potential of the repeat-pass synthetic aperture radar interferometry (InSAR) coherence for grasslands monitoring in Eastern Cape Province, in South Africa. We used 12 pairs of InSAR data in the Interferometric Wide swath mode

Externí odkaz: https://doaj.org/article/c42cf33175364a819701738c72161a33

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Akademický článek

Preparation of superhydrophobic nanocalcite crystals using Box–Behnken design

Autor: Said M. El-Sheikh, Ahmed Barhoum, Samya El-Sherbiny, Fatma Morsy, Ayman Abdel-Hamid El-Midany, Hubert Rahier

Publikováno v: Arabian Journal of Chemistry, Vol 12, Iss 7, Pp 1479-1486 (2019)

Superhydrophobic nanocalcite crystals were prepared via an adjusted aqueous reaction of CaO, CO2 gas and sodium oleate. Box–Behnken design was used to optimize the preparation parameters such as CaO concentration, CO2 gas flow rate and surfactant c

Externí odkaz: https://doaj.org/article/ee3064fc450c4f25a367f2fc3109b2b9

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