Number of found documents: 231
Published from to

An XSPEC model to explore spectral features from black-hle sources. II. The relativistic iron line in the lamp-post geometry
Dovčiak, Michal; Svoboda, Jiří; Goosmann, R. W.; Karas, Vladimír; Matt, G.; Sochora, Vjačeslav
2014 - English
In the paper authors compare the two radial profiles of the line emission - the broken power-law dependence and illumination in the lamp-post scenario. Keywords: accretion discs; black hole physics; relativistic processes Available at various institutes of the ASCR
An XSPEC model to explore spectral features from black-hle sources. II. The relativistic iron line in the lamp-post geometry

In the paper authors compare the two radial profiles of the line emission - the broken power-law dependence and illumination in the lamp-post scenario.

Dovčiak, Michal; Svoboda, Jiří; Goosmann, R. W.; Karas, Vladimír; Matt, G.; Sochora, Vjačeslav
Astronomický ústav, 2014

On oscillations in turbulent accretion disks: I. A general approach
Horák, Jiří
2014 - English
In the article a general theory of a wave propagation in a turbulent media is reviewed. Keywords: black hole physics; accretion disks; oscillations Available at various institutes of the ASCR
On oscillations in turbulent accretion disks: I. A general approach

In the article a general theory of a wave propagation in a turbulent media is reviewed.

Horák, Jiří
Astronomický ústav, 2014

Effects of environmental drag onto a fast-moving magnetic compact star near a supermassive black hole
Karas, Vladimír; Šubr, L.; Kunneriath, Devaky; Zajaček, Michal
2014 - English
The authors discuss whether a strong magnetic field of a neutron star can significantly enhance the drag effect by increasing the effective cross-sectional area for the mutual interaction. Keywords: accretion discs; black hole physics Available at various institutes of the ASCR
Effects of environmental drag onto a fast-moving magnetic compact star near a supermassive black hole

The authors discuss whether a strong magnetic field of a neutron star can significantly enhance the drag effect by increasing the effective cross-sectional area for the mutual interaction.

Karas, Vladimír; Šubr, L.; Kunneriath, Devaky; Zajaček, Michal
Astronomický ústav, 2014

Revealing general relativity effects from accretion events near a supermassive black hole
Karas, Vladimír; Dovčiak, Michal; Eckart, A.; Kunneriath, Devaky; Zamaninasab, M.
2014 - English
The authors discuss the general relativity effects acting on the radiationmsignal from the inner accretion flow. Keywords: black holes; galactic center; relativity Available at various institutes of the ASCR
Revealing general relativity effects from accretion events near a supermassive black hole

The authors discuss the general relativity effects acting on the radiationmsignal from the inner accretion flow.

Karas, Vladimír; Dovčiak, Michal; Eckart, A.; Kunneriath, Devaky; Zamaninasab, M.
Astronomický ústav, 2014

Application of a sympletic integrator in a non-integrable relativistic system
Kopáček, Ondřej; Karas, Vladimír; Kovář, J.; Stuchlík, Z.
2014 - English
The authors present a detailed comparison of several integration schemes applied to the dynamic system consisting of a charged particle on the Kerr background endowed with the axisymmetric electromagnetic test field. Keywords: black hole physics; test particle dynamics; magnetic fields Available at various institutes of the ASCR
Application of a sympletic integrator in a non-integrable relativistic system

The authors present a detailed comparison of several integration schemes applied to the dynamic system consisting of a charged particle on the Kerr background endowed with the axisymmetric ...

Kopáček, Ondřej; Karas, Vladimír; Kovář, J.; Stuchlík, Z.
Astronomický ústav, 2014

Compton scattering in strong gravity
Bursa, Michal; Adámek, K.
2014 - English
The authors present new numerical code for radiation transport in strong gravity regime that includes arbitrary emission and absorption mechanisms and also electron scattering. Keywords: radiation transport; relativity; Compton scattering Available at various institutes of the ASCR
Compton scattering in strong gravity

The authors present new numerical code for radiation transport in strong gravity regime that includes arbitrary emission and absorption mechanisms and also electron scattering.

Bursa, Michal; Adámek, K.
Astronomický ústav, 2014

Variace geoidu detekované z družicové mise GRACE
Kostelecký, J.; Bezděk, Aleš; Klokočník, Jaroslav
2014 - Czech
Časově proměnné gravitační pole, získané z pozorování mise GRACE od roku 2002, je v tomto příspěvku založené na transformaci měsíčních gravitačních polích na výšku geoidu. Ukážeme gravitační změny působené globálním hydrologickým cyklem a hydrologií na pevninách. Time variability of the gravity field, provided by the GRACE mission since 2002, presented here is based on the transformation of monthly gravity field models to the geoid. We show the changes caused by the global water cycle and land hydrology. Keywords: GRACE mission; geoid; gravimetry Available at various institutes of the ASCR
Variace geoidu detekované z družicové mise GRACE

Časově proměnné gravitační pole, získané z pozorování mise GRACE od roku 2002, je v tomto příspěvku založené na transformaci měsíčních gravitačních polích na výšku geoidu. Ukážeme gravitační změny ...

Kostelecký, J.; Bezděk, Aleš; Klokočník, Jaroslav
Astronomický ústav, 2014

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; teorie dat; analýza 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

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

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; vlnková transformace; Be hvězdy 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

About project

NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web

Send your suggestions and comments to nusl@techlib.cz

Provider

http://www.techlib.cz

Facebook

Other bases