Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Araujo, Francisco"'
This paper introduces a method for aligning solar observations from different telescopes. We utilized helioprojective coordinates from the Solar Dynamics Observatory (SDO) as a reference to align images from ALMA and IRIS. The alignment is based on c
Externí odkaz:
http://arxiv.org/abs/2404.04401
Autor:
Araújo, Francisco, Pinto, Paulo R.
Every representation of the Cuntz algebra $\mathcal{O}_n$ leads to a unitary representation of the Higman-Thompson group $V_n$. We consider the family $\{\pi_x\}_{x\in [0,1[}$ of permutative representations of $\mathcal{O}_n$ that arise from the inte
Externí odkaz:
http://arxiv.org/abs/2011.13679
Autor:
Araújo, Francisco Renato C.
The popularization of cloud computing has provided the emergence of large volumes of data that are stored in Data Centers (DCs). These locations store data of different types, origins, and priorities for their owners. The DCs are subject to natural o
Externí odkaz:
http://arxiv.org/abs/2005.01461
In view of the difficulties encountered in science teaching, specifically in the teaching of physics, studies aim to develop methodologies that help science teaching. In this context, the present work proposes the use of the Arduino platform as a met
Externí odkaz:
http://arxiv.org/abs/2003.10594
Autor:
Araújo, Francisco, Kinyon, Michael
Publikováno v:
Portugaliae Mathematica 74 (2017), no 3, 243-255
In this note we prove a selection of commutativity theorems for various classes of semigroups. For instance, if in a separative or completely regular semigroup $S$ we have $x^p y^p = y^p x^p$ and $x^q y^q = y^q x^q$ for all $x,y\in S$ where $p$ and $
Externí odkaz:
http://arxiv.org/abs/1706.00381
Publikováno v:
A&A, 517, A30 (2010)
B[e] supergiants are surrounded by large amounts of hydrogen neutral material, traced by the emission in the optical [OI] lines. This neutral material is most plausibly located within their dense, cool circumstellar disks, which are formed from the (
Externí odkaz:
http://arxiv.org/abs/1005.4511
Autor:
Fernandes, Marcelo Borges, Kraus, Michaela, Chesneau, Olivier, de Souza, Armando Domiciano, de Araujo, Francisco Xavier, Stee, Philippe, Meilland, Anthony
The observed spectral variation of HD 50138 has led different authors to classify it in a very wide range of spectral types and luminosity classes (from B5 to A0 and III to Ia) and at different evolutionary stages as either HAeBe star or classical Be
Externí odkaz:
http://arxiv.org/abs/0911.2623
Autor:
de Mello, Ana Beatriz, Lorenz-Martins, Silvia, de Araújo, Francisco Xavier, Pereira, Claudio Bastos, Landaberry, Sayd Jose Codina
A new classification system for carbon-rich stars is presented based on an analysis of 51 AGB carbon stars through the most relevant classifying indices available. The extension incorporated, that also represents the major advantage of this new syste
Externí odkaz:
http://arxiv.org/abs/0910.4086
Publikováno v:
A&A, 487, 697-707 (2008)
Optical observations from 1989 of the SMC B[e] supergiant star S23 revealed the presence of photospheric HeI absorption lines. In our high-resolution optical spectra from 2000, however, we could not identify any HeI line. The observed changes in spec
Externí odkaz:
http://arxiv.org/abs/0806.3208
Autor:
Ahlers, Guenter, Calzavarini, Enrico, Araujo, Francisco Fontenele, Funfschilling, Denis, Grossmann, Siegfried, Lohse, Detlef, Sugiyama, Kazuyasu
Publikováno v:
Phys. Rev. E 77, 046302 (2008)
As shown in earlier work (Ahlers et al., J. Fluid Mech. 569, p.409 (2006)), non-Oberbeck Boussinesq (NOB) corrections to the center temperature in turbulent Rayleigh-Benard convection in water and also in glycerol are governed by the temperature depe
Externí odkaz:
http://arxiv.org/abs/0712.0079