Number of found documents: 244
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L-DEPP Definition Study for Lunar Lander - Lunar Plasma Monitor Proof-of-Concep: Final report
Laifr, Jaroslav; Trávníček, Pavel M.; Pavelka, Roman; Herčík, David; Štverák, Štěpán
2013 - English
A functional breadboard model of the LPM instrument, originally proposed for the L-DEPP experiment on board the Lunar Lander mission, has been designed, manufactured, and tested in order to verify the floating ground concept implemented for the Langmuir probe measuring technique. The functionality of the proposed design has been confirmed throughout an extensive set of testing procedures. Keywords: lunar exploration; space instrumentation; Langmuir probes Available at various institutes of the ASCR
L-DEPP Definition Study for Lunar Lander - Lunar Plasma Monitor Proof-of-Concep: Final report

A functional breadboard model of the LPM instrument, originally proposed for the L-DEPP experiment on board the Lunar Lander mission, has been designed, manufactured, and tested in order to verify the ...

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

Upcoming Features of SPLAT-VO in Astroinformatics
Šaloun, P.; Andrešič, D.; Škoda, Petr; Zelinka, I.
2013 - English
During last decade was developed fully automatized (robotic) class of telescopes, that produce huge amount of data per each night. Amount of recorded data is usually in the scale of petabytes. To process properly all data and select an important events it is needed to use sophisticated software methods and algorithms. It caused an appearance of a new field of science - astroinformatics. In this paper we introduce a small part of our contribution to the astroinformatics field - a specialized software SPLAT-VO. It is used for processing and visualization of astrophysical data generated by nonlinear, complex or even chaotic processes in the space. Overview of new features so far prepared for new version of SPLAT-VO. The overview is focused on enhancements of user experience, work with SAMP protocol and other interoperability that improves work with global list of spectra, plot window and analysis menu. Keywords: SPLAT-VO; spectrum analysis; SAMP Available at various institutes of the ASCR
Upcoming Features of SPLAT-VO in Astroinformatics

During last decade was developed fully automatized (robotic) class of telescopes, that produce huge amount of data per each night. Amount of recorded data is usually in the scale of petabytes. To ...

Šaloun, P.; Andrešič, D.; Škoda, Petr; Zelinka, I.
Astronomický ústav, 2013

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 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

Wavelet Based Feature Extraction for Clustering of Be Stars
Bromová, P.; Škoda, Petr; Zendulka, J.
2013 - English
The goal of our work is to create a feature extraction method for classification of Be stars. Be stars are characterized by prominent emission lines in their spectrum. We focus on the automated classification of Be stars based on typical shapes of their emission lines. We aim to design a reduced, specific set of features characterizing and discriminating the shapes of Be lines. In this paper, we present a feature extraction method based on the wavelet transform and its power spectrum. Both the discrete and continuous wavelet transform are used. Different feature vectors are created and compared on clustering of Be stars spectra from the archive of the Astronomical Institute of the Academy of Sciences of the Czech Republic. The clustering is performed using the kmeans algorithm. The results of our method are promising and encouraging to more detailed analysis. Keywords: feature extraction; stellar spectra; wavelet transform Available at various institutes of the ASCR
Wavelet Based Feature Extraction for Clustering of Be Stars

The goal of our work is to create a feature extraction method for classification of Be stars. Be stars are characterized by prominent emission lines in their spectrum. We focus on the automated ...

Bromová, P.; Škoda, Petr; 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 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

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