Number of found documents: 217
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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

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 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 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 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

The study of magnetic clouds: expansion and discontinuities
Lynnyk, A.; Vandas, Marek
2009 - English
Magnetic clouds observed during the 1995-2003 years are fitted using force-free cylindrical flux rope models. The cloud parameters yielded by a static model are compared with those obtained from a modified model that includes magnetic cloud expansion. Keywords: magnetic field; magnetic cloud; solar wind Available at various institutes of the ASCR
The study of magnetic clouds: expansion and discontinuities

Magnetic clouds observed during the 1995-2003 years are fitted using force-free cylindrical flux rope models. The cloud parameters yielded by a static model are compared with those obtained from a ...

Lynnyk, A.; Vandas, Marek
Astronomický ústav, 2009

Posuvy dopplerovského rychlostního pole ve skvrnách
Klvaňa, Miroslav; Bumba, Václav
2009 - Czech
Střední hodnota dopplerovského rychlostního pole v oblastech vyplněných magnetickým polem vykazuje systematický rudý posuv vůči sousedním oblastem bez magnetického pole v rozmezí 37 – 191 m/s. Analyzujeme změny v morfologii Evershedova efektu. The mean value of Doppler velocity field in magnetized regions shows a sytematic redshift compared to the neighbouring non-magnetic regions in the range 37 – 191 m/s. Changes in the morphology of the Evershed effect are analyzed. Keywords: solar velocity fields; sunspots Available at various institutes of the ASCR
Posuvy dopplerovského rychlostního pole ve skvrnách

Střední hodnota dopplerovského rychlostního pole v oblastech vyplněných magnetickým polem vykazuje systematický rudý posuv vůči sousedním oblastem bez magnetického pole v rozmezí 37 – 191 m/s. ...

Klvaňa, Miroslav; Bumba, Václav
Astronomický ústav, 2009

Helioseismologie – od oscilací k vnitřní struktuře
Švanda, Michal
2009 - Czech
Sluneční oscilace umožňují konstrukci podrobného modelu Slunce a mapování detailů slunečního nitra. Stručný nástin metod globální a lokální helioseismologie. Solar oscillations make it possible to construct a detailed model od the Sun and to map details of the solar interior. A brief outline of methods of the global and local helioseismology. Keywords: solar oscillations; helioseismology Available at various institutes of the ASCR
Helioseismologie – od oscilací k vnitřní struktuře

Sluneční oscilace umožňují konstrukci podrobného modelu Slunce a mapování detailů slunečního nitra. Stručný nástin metod globální a lokální helioseismologie....

Švanda, Michal
Astronomický ústav, 2009

Shell-Like Structures in the ISM: Observation Versus Simulations
Sidorin, Vojtěch; Palouš, Jan
2009 - English
The interstellar medium in galaxies is a turbulent environment with a plethora of holes, bubbles and shells. All these shell-like structures are thought to be closely related to the formation, evolution and death of stars. In most cases, they are likely created by the winds of OB stars and supernovae. The material collected along the borders of shells may fragment, become unstable under its own gravity, and create a new generation of stars. This is a variant of triggered star formation referred to as the collect-and-collapse scenario. The aim of our research is to compare numerical simulations of shell-like structures to observations and to search for and investigate regions of triggered star formation in the Milky Way. Keywords: shells; ism; triggered star formation Available at various institutes of the ASCR
Shell-Like Structures in the ISM: Observation Versus Simulations

The interstellar medium in galaxies is a turbulent environment with a plethora of holes, bubbles and shells. All these shell-like structures are thought to be closely related to the formation, ...

Sidorin, Vojtěch; Palouš, Jan
Astronomický ústav, 2009

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