Number of found documents: 231
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Classification on Be stars using feature extraction based on discrete wavelet transform
Bromová, P.; Bařina, D.; Škoda, Petr; Vážný, Jaroslav; Zendulka, J.
2013 - English
We describe the initial experiments in the field of automated classification of spectal line profiles of emission line stars. Keywords: Be star; stellar spectrum; feature extraction; hvězdy; extrakce Available at various institutes of the ASCR
Classification on Be stars using feature extraction based on discrete wavelet transform

We describe the initial experiments in the field of automated classification of spectal line profiles of emission line stars.

Bromová, P.; Bařina, D.; Škoda, Petr; Vážný, Jaroslav; Zendulka, J.
Astronomický ústav, 2013

DSLP Operations on Board Proba 2 - Raw Data Processing and Archiving: FINAL REPORT
Štverák, Štěpán; Trávníček, Pavel M.; Herčík, David; Pavelka, Roman
2013 - English
A complete DSLP data archive has been developed including full automated data processing chain from raw data up to higher level products. The archive, based on PDS and CDF standards, is available online including full documentation on the DSLP instrument and its operations on board Proba 2 satellite. Keywords: Langmuir probes; ionospheric plasma; data processing Available at various institutes of the ASCR
DSLP Operations on Board Proba 2 - Raw Data Processing and Archiving: FINAL REPORT

A complete DSLP data archive has been developed including full automated data processing chain from raw data up to higher level products. The archive, based on PDS and CDF standards, is available ...

Štverák, Štěpán; Trávníček, Pavel M.; Herčík, David; Pavelka, Roman
Astronomický ústav, 2013

On transfer of mass and angular momentum from accretion disk onto black hole
Hamerský, Jaroslav; Karas, Vladimír
2012 - English
We study the properties of accretion tori orbiting Kerr black hole. Our approach to this problem comes from the solving of general relativistic magnetohydrodynamic equations, which follow from conservation of the energy-momentum tensor, the particle number and from Maxwell's equations. We solve these equations by numerical methods. We are interested in tori with constant density of angular momentum and those with radially increasing angular momentum density. We study accretion rates in these tori when the mass of black hole is increased suddenly and so the equilibrium in the torus is perturbed. We also study the influence of the presence of toroidal magnetic field on accretion rates. Keywords: accretion disk; relativity; MHD Available at various institutes of the ASCR
On transfer of mass and angular momentum from accretion disk onto black hole

We study the properties of accretion tori orbiting Kerr black hole. Our approach to this problem comes from the solving of general relativistic magnetohydrodynamic equations, which follow from ...

Hamerský, Jaroslav; Karas, Vladimír
Astronomický ústav, 2012

L-DEPP Definition Study for Lunar Lander FINAL REPORT "
Trávníček, Pavel M.; Štverák, Štěpán; Hellinger, Petr; Herčík, David; Laifr, Jaroslav; Pavelka, Roman; Váňa, P.; Břínek, J.; Kozáček, Z.; Rucker, H.; Sampl, M.; Auster, U.; Glassmeier, K. - H.; Kataria, D.; Owen, C. J.; Farrell, W.M.; MacDowall, R. J.; Sternovsky, Z.; Horanyi, M.; Delory, G.T.; Turin, P.
2012 - English
A complete set of scientific instrumentation for the L-DEPP dust, plasma and waves package for the ESA Lunar Lander mission has been proposed and fully assessed with respect to the system and scientific requirements derived by ESA and the L-DEPP project team. The preliminary design from the system level down to the individual sensors is presented. Keywords: lunar exploration; space instrumentation Available at various institutes of the ASCR
L-DEPP Definition Study for Lunar Lander FINAL REPORT "

A complete set of scientific instrumentation for the L-DEPP dust, plasma and waves package for the ESA Lunar Lander mission has been proposed and fully assessed with respect to the system and ...

Trávníček, Pavel M.; Štverák, Štěpán; Hellinger, Petr; Herčík, David; Laifr, Jaroslav; Pavelka, Roman; Váňa, P.; Břínek, J.; Kozáček, Z.; Rucker, H.; Sampl, M.; Auster, U.; Glassmeier, K. - H.; Kataria, D.; Owen, C. J.; Farrell, W.M.; MacDowall, R. J.; Sternovsky, Z.; Horanyi, M.; Delory, G.T.; Turin, P.
Astronomický ústav, 2012

New model of precession, valid in time interval 400 thousand years
Vondrák, Jan
2012 - English
New model of precession, expressed in terms of long-periodic trigonometric functions of time is developed, based on numerical integration of motions of the Solar system bodies. Its validity is +/- 200 thousand years from the basic epoch J2000, with the accuracy below one milliarcsecond in the central part and gradually decreasing to a few arcminutes towards both ends of the interval of validity. Keywords: reference systems; precession Fulltext is available at external website.
New model of precession, valid in time interval 400 thousand years

New model of precession, expressed in terms of long-periodic trigonometric functions of time is developed, based on numerical integration of motions of the Solar system bodies. Its validity is +/- 200 ...

Vondrák, Jan
Astronomický ústav, 2012

Feature extraction using wavelet power spectrum for stellar spectra clustering
Škoda, Petr; Bromová, P.; Zendulka, J.
2012 - English
This paper analyses the capabilities of using wavelet power spectrum for clustering of Be-type stars spectra. We propose a method using discrete wavelet transform for feature extraction and the wavelet power spectrum as a feature vector. Keywords: Be star; stellar spectrum; feature extraction; vlnková transformace; hvězdy Available at various institutes of the ASCR
Feature extraction using wavelet power spectrum for stellar spectra clustering

This paper analyses the capabilities of using wavelet power spectrum for clustering of Be-type stars spectra. We propose a method using discrete wavelet transform for feature extraction and the ...

Škoda, Petr; Bromová, P.; Zendulka, J.
Astronomický ústav, 2012

Analysis and Suppression of Noise in Astronomical Video
Švihlík, J.; Fliegel, K.; Koten, Pavel; Jerhotova, E.; Vítek, S.; Páta, P.
2011 - English
This paper is devoted to noise suppression in systems for double station observation of meteors, nowadays known as MAIA (Meteor Automatic Imager and Analyzer). The noise analysis based on acquisition of testing video sequences at different lighting conditions and their statistical evaluation were described in our previous paper The measurement showed that the type of noise generated by the system is signal-independent in a certain illumination range. The noise and image models in the wavelet domain are based on the Generalized Laplacian Model (GLM) and it is the most convenient to estimate the model parameters using the moment method. Furthermore, the noise component may be modeled by the GLM also in the space domain. Overall, we verified that the GLM allows for modeling various types of probability density functions. In the final section of this paper, the performance of the proposed advanced de noising algorithm is verified on the real data, which were acquired in the Astronomical Institute. Keywords: MAIA; meteor; noise analysis Available at various institutes of the ASCR
Analysis and Suppression of Noise in Astronomical Video

This paper is devoted to noise suppression in systems for double station observation of meteors, nowadays known as MAIA (Meteor Automatic Imager and Analyzer). The noise analysis based on acquisition ...

Švihlík, J.; Fliegel, K.; Koten, Pavel; Jerhotova, E.; Vítek, S.; Páta, P.
Astronomický ústav, 2011

Kosmologie, čísla a Platonova duše světa
Rajchl, Jaroslav
2011 - Czech
Současná kosmologie se vyznačuje velkým množstvím nejrůznějších modelů. Bližší pohled ukazuje, že všechny oplývají určitým typem dualnosti, a sice propojením dynamické a formativní podoby, jejichž společným zdrojem je známý Velký třesk (BB). Abychom zpřehlednili onen složitý obraz, vybrali jsme jako určitý sjednocující symbol tzv. Platonův model duše světa (PDS), který vychází z Pythagorova postřehu, že analogickou dualností se vyznačují i čísla. The present status of cosmology is characterized by a variety of many different models. Nevertheless, it shows that some type of duality of both dynamical and the structural nature is typical. Its common source is the Big Bang (BB). To reconcile this very rich manifold we use the Plato’s model „of the World Soul”. Its main idea is the Pythagoras’ one of the role of numbers as fundamental elements of all the things in the World. Keywords: cosmology models; numbers; Plato's model Available at various institutes of the ASCR
Kosmologie, čísla a Platonova duše světa

Současná kosmologie se vyznačuje velkým množstvím nejrůznějších modelů. Bližší pohled ukazuje, že všechny oplývají určitým typem dualnosti, a sice propojením dynamické a formativní podoby, jejichž ...

Rajchl, Jaroslav
Astronomický ústav, 2011

Extremal energy shifts of radiation from a ring near a rotating black hole
Sochora, Vjačeslav; Karas, Vladimír
2010 - English
We present a semi-analytical solution to the problem of finding minimal and maximal energy shifts of radiation originating from an accretion ring near a black hole. The solution is given implicitly in terms of a set of two coupled equations for two unknowns – the constants of photon motion. Keywords: black holes; accretion; černé díry Available at various institutes of the ASCR
Extremal energy shifts of radiation from a ring near a rotating black hole

We present a semi-analytical solution to the problem of finding minimal and maximal energy shifts of radiation originating from an accretion ring near a black hole. The solution is given implicitly in ...

Sochora, Vjačeslav; Karas, Vladimír
Astronomický ústav, 2010

Pravidelnosti v rozložení magnetického pole na Slunci i v čase
Bumba, Václav; Klvaňa, Miroslav
2009 - Czech
Sluneční pozaďová (slabá) magnetická pole jsou na povrchu Slunce rozdělena velmi pravidelně. Tyto pravidelnosti se mění s rozsahem heliografických šířek a jsou pozorovatelné v celém rozsahu více než čtyř slunečních cyklů. Solar background (weak) magnetic fields are very regularly distributed on the solar surface. These regularities change with the range of heliographic latitudes ant they are observable during more than four solar cycles. Keywords: solar magnetic fields; activity; aktivita Available at various institutes of the ASCR
Pravidelnosti v rozložení magnetického pole na Slunci i v čase

Sluneční pozaďová (slabá) magnetická pole jsou na povrchu Slunce rozdělena velmi pravidelně. Tyto pravidelnosti se mění s rozsahem heliografických šířek a jsou pozorovatelné v celém rozsahu více než ...

Bumba, Václav; Klvaňa, Miroslav
Astronomický ústav, 2009

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