Landslide detection in the Himalayas using machine learning algorithms and U-Net     

Meena  Sansar Raj  Soares  Lucas Pedrosa  Grohmann  Carlos H.  van Westen  Cees  Bhuyan  Kushanav  Singh  Ramesh P.  Floris  Mario  Catani  Filippo 《Landslides》2022,19(5):1209-1229

Landslides - Event-based landslide inventories are essential sources to broaden our understanding of the causal relationship between triggering events and the occurring landslides. Moreover,...  相似文献   

Antioxidant and antitumor potential of wild and IMTA-cultivated Osmundea pinnatifida     

Silva  J. Paulo  Alves  Celso  Pinteus  Susete  Silva  Joana  Valado  Ana  Pedrosa  Rui  Pereira  Leonel 《中国海洋湖沼学报》2019,37(3):825-835

Osmundea pinnatifida is a red edible seaweed known as pepper dulse. O. pinnatifida was cultivated in the farm of ALGAplus(Ilhavo, Portugal). This farm is integrated with a seabream and seabass commercial aquaculture and uses the nutrient-enriched water resultant from the fish production as its cultivation medium in the integrated multi-trophic aquaculture(IMTA) manner. Wild and IMTA-cultivated samples of O. pinnatifida were screened for antioxidant and antitumor activities. The antioxidant capacity of solvent extracts from wild and IMTA cultivated samples was assessed in two methods(2,2-diphenyl-1-picrylhydrazyl(DPPH) and oxygen radical absorbance capacity(ORAC)), and their total phenolic contents(TPC) were estimated. Antitumor activity was evaluated in three different tumor cell lines(HepG-2, MCF-7, and SH-SY5Y) through 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay. Among the solvents used for extraction, dichloromethane was the most effective to extract phenolic compounds and presented higher ORAC. A significant correlation was found between TPC and ORAC,which was also sustained by the principal components analysis(PCA). Dichloromethane extracts induced a cytostatic effect on MCF-7 cells and showed weak cytotoxicity to SH-SY5Y cells and weak impact on cell proliferation. Overall, there were no statistically significant differences in the biological activities shown by the wild and IMTA-cultivated samples. Hence, O. pinnatifida can be obtained in an economical and environmentally sustainable way through IMTA, maintaining bioactive properties in a high potential for further nutraceutical purposes.  相似文献   

Gravity-geoelectric joint inversion over the Potiguar rift basin, NE Brazil     

David Lopes de Castro  Nilo Costa Pedrosa Jr.Fernando Acácio Monteiro Santos 《Journal of Applied Geophysics》2011,75(3):431-443

A joint inversion of gravity and geoelectrical data has been performed along a 100 km long profile across the oil-bearing Potiguar rift basin in NE Brazil. The integrated approach is based on the connection between density and resistivity of a sedimentary sequence through the porosity. Seventy-one gravity stations and twenty-nine vertical electrical soundings were carried out across the central part of the Early Cretaceous basin in the Precambrian Borborema Province to apply the proposed joint inversion. Both the physical properties and geometry of the multilayer deep model were well constrained by a wide set of prior information obtained by surface mapping, geophysical logs and seismic sections. The results reveal a rift architecture formed by a 5000 m thick half-graben structure separated by an intervening basement high and an extensive adjacent platform with a sedimentary infill of about 300 m thick. The calculated model shows geometries for the sedimentary density/resistivity interfaces in agreement with the seismostratigraphic sequences revealed by seismic section, representing a substantial improvement in comparison with previously published gravity models.  相似文献   

The Signatures of Structured Winds in T Tauri Stars     

Maria Teresa V.T. Lago  Jorge F. Gameiro  Vitor M. Costa  Leandro Machado  António Pedrosa 《Astrophysics and Space Science》1998,261(1-4):107-116

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Optical and infrared photometry of the Type IIn SN 1998S: days 11–146     

A. Fassia  W. P. S. Meikle  W. D. Vacca  S. N. Kemp  N. A. Walton  D. L. Pollacco  S. Smartt  A. Oscoz  A. Aragón-Salamanca  S. Bennett  T. G. Hawarden  A. Alonso  D. Alcalde  A. Pedrosa  J. Telting  M. J. Arevalo  H. J. Deeg  F. Garzón  A. Gómez-Roldán  G. Gómez  C. Gutiérrez  S. López  M. Rozas  M. Serra-Ricart  M. R. Zapatero-Osorio 《Monthly notices of the Royal Astronomical Society》2000,318(4):1093-1104

We present contemporaneous optical and infrared (IR) photometric observations of the Type IIn SN 1998S covering the period between 11 and 146 d after discovery. The IR data constitute the first ever IR light curves of a Type IIn supernova. We use blackbody and spline fits to the photometry to examine the luminosity evolution. During the first 2–3 months, the luminosity is dominated by the release of shock-deposited energy in the ejecta. After ∼100 d the luminosity is powered mostly by the deposition of radioactive decay energy from 0.15±0.05 M_⊙ of ⁵⁶Ni which was produced in the explosion. We also report the discovery of an astonishingly high IR excess, K − L '=2.5, that was present at day 130. We interpret this as being due to thermal emission from dust grains in the vicinity of the supernova. We argue that to produce such a high IR luminosity so soon after the explosion, the dust must be pre-existing and so is located in the circumstellar medium of the progenitor. The dust could be heated either by the UV/optical flash (IR echo) or by the X-rays from the interaction of the ejecta with the circumstellar material.  相似文献