Results 41 to 50 of about 86,904 (210)

Espectro de luz solar: do infravermelho ao ultravioleta [PDF]

, 2018
Desde as primeiras civilizações, a humanidade observa o céu e estuda os fenômenos procurando entender a origem e a evolução do Universo. A Astronomia como conteúdo integrante das Ciências Naturais e seu caráter multidisciplinar, permite desenvolver o ...
Crivelari, Andressa Marlise de Souza, Pereira, Denise Fabiola Sachetti, Tessari, Faviane Quadros Bitencourt   +2 more
core  

Detection of Faint BLR Components in the Starburst/Seyfert Galaxy NGC 6221 and Measure of the Central BH Mass [PDF]

, 2016
In the last decade, using single epoch virial based techniques in the optical band, it has been possible to measure the central black hole mass on large AGN1 samples.
Bianchi, Stefano, La Franca, Fabio, Marconi, Alessandro, Onori, Francesca, Ricci, Federica, Sani, Eleonora, Vignali, Cristian   +6 more
core   +3 more sources

High Geomagnetic Reversal Frequency During the Middle to Late Ediacaran (∼570 Ma) Constrained by Integrated Magneto‐ and Cyclostratigraphy

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract The Ediacaran–Cambrian (∼635–539 Ma) geomagnetic field is characterized by unusually high reversal rates and markedly weakened field strength. Estimates of these reversal frequencies can reveal key aspects of deep Earth dynamics and their potential influence on surface environments and early complex life.
J. W. L. Afonso, R. M. Rocha, D. R. Franco, N. B. Dos Santos, C. G. Leandro, P. Franceschinis, A. E. Rapalini, M. J. Arrouy, L. E. Gómez‐Peral, D. G. Poiré, S. Caetano‐Filho, H. D. Brito, R. I. F. Trindade   +12 more
wiley   +1 more source

A montagem e a utilização de lunetas de baixo custo como experiência motivadora ao ensino de astronomia

Revista Brasileira de Ensino de Física
O trabalho apresentado debate sobre uma experiência de formação continuada envolvendo professores do ensino médio da região de Bauru (SP), na qual uma Oficina de Lunetas foi realizada, complementando os saberes docentes sobre a astronomia.
Gustavo Iachel, Marcelo Gomes Bacha, Marina Pereira de Paula, Rosa M. Fernandes Scalvi   +3 more
doaj   +1 more source

"The Pyrenees are not hollow": the mountain as a boundary object "Os Pirineus não são ecos": a montanha como objeto de fronteira

História, Ciências, Saúde: Manguinhos, 2009
In Toulouse, around 1850, a controversy about the structure of the Pyrenees pitted observatory director Frederic Petit against geology professor Alexandre Leymerie.
Jérôme Lamy
doaj   +1 more source

Energetics of nearby stellar bow shocks [PDF]

, 2012
The latest survey of stellar bow shocks (Peri et al. 2012) lists 28 candidates detected at IR wavelengths, associated with massive, early-type stars up to 3 kpc, along with the geometrical parameters of the structures found.
Benaglia, Paula
core   +1 more source

Cosmic-ray driven dynamo in galaxies [PDF]

, 2011
We present recent developments of global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992).
Allen, Berezinskii, D. Wóltanski, H. Kotarba, Hanasz, Hanasz, Hanasz, Hanasz, Hanasz, K. Kowalik, Kowal, M. Hanasz, Schlickeiser, Siejkowski   +13 more
core   +2 more sources

State of the Early Career Profession in Space Physics and Aeronomy: Climatological Survey Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The American Geophysical Union (AGU) Space Physics & Aeronomy (SPA) section comprises scientists who study the Sun, solar wind, and planetary magnetospheres, ionospheres, and thermospheric/mesospheric systems along with their interconnections.
R. C. Allen, B. Gallardo‐Lacourt, S. Raptis, C. R. Gilly, L. C. Gasque, B. L. Alterman, J. C. Buitrago‐Casas, E. P. Macho, G. Malhotra, R. M. McGranaghan, P. Mostafavi, S. K. Vines   +11 more
wiley   +1 more source

Measurement of the 240Pu(n,f) cross-section at the CERN n-TOF facility : First results from experimental area II (EAR-2) [PDF]

, 2016
The accurate knowledge of the neutron-induced fission cross-sections of actinides and other isotopes involved in the nuclear fuel cycle is essential for the design of advanced nuclear systems, such as Generation-IV nuclear reactors.
A. Ferrari, A. Goverdovski, A. Hernández-Prieto, A. Kimura, A. Mengoni, A. Musumarra, A. Pavlik, A. Plompen, A. Plompen, A. Riego-Perez, A. Saxena, A. Stamatopoulos, A. Tarifeño-Saldivia, A. Tsinganis, A. Ventura, A. Wallner, A.G. Smith, A.R. García, Abbondanno, B. Fernández-Domínguez, C. Beinrucker, C. Domingo-Pardo, C. Guerrero, C. Lederer, C. Massimi, C. Paradela, C. Rubbia, C. Weiss, Chadwick, D. Bosnar, D. Cano-Ott, D. Macina, D. Schumann, D.G. Jenkins, E. Berthoumieux, E. Chiaveri, E. Dupont, E. González, E. Griesmayer, E. Jericha, E. Leal-Cidoncha, E. Mendoza, F. Belloni, F. Bečvář, F. Calviño, F. Cerutti, F. Gunsing, F. Käppeler, F. Matteucci, F. Mingrone, F.-J. Hambsch, F.R. Palomo-Pinto, Ferrari, G. Cortés, G. Tagliente, G. Vannini, Giomataris, Giomataris, Guerrero, H. Harada, H. Leeb, I. Durán, I. Gheorghe, I.F. Gonçalves, J. Andrzejewski, J. Balibrea, J. Billowes, J. Heyse, J. Heyse, J. Lerendegui-Marco, J. Marganiec, J. Perkowski, J. Praena, J.A. Ryan, J.I. Porras, J.L. Tain, J.M. Quesada, K. Deo, K. Göbel, L. Audouin, L. Cosentino, L. Tassan-Got, L.A. Damone, Laptev, M. Bacak, M. Barbagallo, M. Brugger, M. Caamaño, M. Calviani, M. Diakaki, M. Kokkoris, M. Krtička, M. Licata, M. Mastromarco, M. Mirea, M. Robles, M. Sabaté-Gilarte, M. Weigand, M.A. Cortés-Giraldo, M.B. Gómez-Hornillos, N. Colonna, N. Kivel, N. Patronis, O. Aberle, P. Ferreira, P. Finocchiaro, P. Kavrigin, P. Mastinu, P. Schillebeeckx, P. Schillebeeckx, P. Sedyshev, P. Siegler, P. Vaz, P. Žugec, P.M. Milazzo, R. Dressler, R. Losito, R. Nolte, R. Reifarth, R. Vlastou, R.J.W. Frost, S. Barros, S. Heinitz, S. Kopecky, S. Lo Meo, S. Montesano, S. Oberstedt, S. Schmidt, S. Valenta, S. Warren, S.V. Suryanarayana, Salvador-Castiñeira, Sibbens, T. Glodariu, T. Heftrich, T. Katabuchi, T. Martínez, T. Rauscher, T. Wright, Tovesson, V. Boccone, V. Bécares, V. Furman, V. Ketlerov, V. Khryachkov, V. Variale, V. Vlachoudis, W. Mondelaers, Weiéy, Y. Kadi, Žugec   +150 more
core   +11 more sources

Wasserstoffaktivierung über Dihydrid‐Bildung an einem Rh1/Fe3O4(001)‐Einzelatomkatalysator

Angewandte Chemie, Volume 138, Issue 14, 27 March 2026.
Die Deuterium‐ (Wasserstoff‐)Adsorption am Einzelatomkatalysator Rh1/Fe3O4(001) induziert keinen D‐ (H‐)Spillover auf den reduzierbaren Fe3O4‐Träger. Stattdessen bildet sich eine Rh1‐Dihydrid‐Spezies (Rh−2D bzw. Rh−2H), dessen Wasserstoff beim Tempern desorbiert. ZUSAMMENFASSUNG Die Wasserstoffaktivierung ist ein zentraler Schritt in der katalystischen
Chunlei Wang, Panukorn Sombut, Lena Puntscher, Nail Barama, Maosheng Hao, Florian Kraushofer, Jiri Pavelec, Matthias Meier, Florian Libisch, Michael Schmid, Ulrike Diebold, Cesare Franchini, Gareth S. Parkinson   +12 more
wiley   +1 more source