Wszystkie pola: Estrada, A.R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fungal spores in four catholic churches in the metropolitan area of Monterrey, Nuevo León State, Mexico – First study
Autorzy:: Estrada, A.R.
Torres, E.M.
Vazquez, M.A.A.
Pinero, J.L.H.
Lucio, M.A.G.
Martinez, S.M.S.
Powiązania:: https://bibliotekanauki.pl/articles/52132.pdf
Data publikacji:: 2015
Wydawca:: Instytut Medycyny Wsi
Źródło:: Annals of Agricultural and Environmental Medicine; 2015, 22, 2
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A two cones support theorem
Autorzy:: Estrada, R.
Powiązania:: https://bibliotekanauki.pl/articles/255211.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: Radon transforms
support theorems
distributions
Opis:: We show that if the Radon transform of a distribution ƒ vanishes outside of an acute cone Co, the support of the distribution is contained in the union of Co and another acute cone C1, the cones are in a suitable position, and ƒ vanishes distributionally in the direction of the axis of C1, then actually supp ƒ C ⊂ Co. We show by examples that this result is sharp.
Źródło:: Opuscula Mathematica; 2016, 36, 2; 207-213
1232-9274
2300-6919
Pojawia się w:: Opuscula Mathematica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Seasonal pattern of the chlorophyll-a in a coastal lagoon from the Southern Baja California (Mexico), described with in situ observations and MODIS-Aqua imagery
Autorzy:: Jimenez-Quiroz, M.C.
Martell-Dubois, R.
Cervantes-Duarte, R.
Cerdeira-Estrada, S.
Powiązania:: https://bibliotekanauki.pl/articles/2078912.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: chlorophyll a
coastal lagoon
remote sensing
transitional zone
climatology
seasonal pattern
phytoplankton biomass
distribution
multivariate statistical method
MODIS-Aqua data
Opis:: This study aims to estimate, with a climatology perspective, the average seasonal pattern of phytoplankton biomass (SP-PBavg) and its distribution in Bahia Magdalena (Mexico) as a baseline to evaluate PB changes in future studies. This lagoon is in a semi-arid region, lacks river discharges, and channels with vegetation are limited at the north and south zones. SP-PBavg was estimated with chlorophyll-a (chl-a) data obtained in 21 sites on daily MODISAqua imagery (2002—2013; n = 2,418) from a ready-to-use public database. The first step was to establish criteria to use imagery and validate with in situ observations taken in 14 sites (2002—2011; n = 312). MODIS-Aqua overestimated chl-a (mean ± confidence interval95: 5.09 ± 0.97 mg m−3; n = 225); with differences among sites. There were no differences near the inlet lagoon (p <0.05), where the water characteristics are Case-1 while values were significantly higher in the eastern shore and two or three times higher in the mouth of north and south channels, whose water characteristics are similar to Case-2. Multivariate statistical methods allow defining zones into the lagoon and describe their SP-PBavg with both in situ and MODIS Aqua data, but the former’s sample size was small, and the patterns were only delineated. In the inlet surroundings, chl-a peaks from March/April to June/July. On the eastern shore, where MODIS Aqua and in situ data were correlated, despite concentration differences, chla is higher from March/April to October, with peaks in June and September. In the mouth of internal channels, chl-a was higher than other sites and during a longer period; however, the very high MODIS-Aqua values suggest that the satellite also detects organic matter supplied by phytoplankton and other vegetables, which explain the high lagoon’s productivity. These results validate the use of MODIS Aqua imagery to describe the chl-a seasonal patterns in the sea’s vicinity
Źródło:: Oceanologia; 2021, 63, 3; 329-342
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Structure, Morphology and Electrical Properties of CaTiO3 Ceramics Synthesized by the Solid-State Reaction Method
Autorzy:: Rocha-Rangel, E.
López-Hernández, J.
Castillo-Martínez, J. A.
Osorio-Ramos, J. J.
Calles-Arriaga, C. A.
Estrada-Guel, I.
Martínez-Sánchez, R.
Powiązania:: https://bibliotekanauki.pl/articles/352238.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: CaTiO3
solid state synthesis
electrical properties
insulating ceramics
Opis:: In this paper, explain the preparation of CaTiO₃ ceramics synthesized by the solid-state reaction method. Calcium carbonate and titanium dioxide were high energy mixed in stoichiometric amounts, and the obtained mixture was calcined at different temperatures (800, 900, 1000 and 1300ºC) for 2h. The obtained samples were characterized by measurement of particle size, Energy Dispersive X-Ray (EDX) Analysis; differential thermal analysis, X-ray diffraction and SEM images. XRD patterns indicated that CaTiO₃ ceramics with the structure of perovskite is obtained from calcined powders at 1,300°C for 2h. SEM images show the formation of a very fine and homogeneous morphology. The measured values of electrical resistivity were within the typical range of insulating materials and approach values corresponding to insulating ceramics.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1749-1753
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki