A5078327412- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Renewable energy and sustainable power systems
- Heat transfer and supercritical fluids
- Combustion and flame dynamics
- Thermochemical Biomass Conversion Processes
- Mechanical and Thermal Properties Analysis
- Astro and Planetary Science
- Solar Thermal and Photovoltaic Systems
- Advanced Power Generation Technologies
- Coal Combustion and Slurry Processing
- Mining and Industrial Processes
- Radiative Heat Transfer Studies
- Building energy efficiency and sustainability
- Adaptive optics and wavefront sensing
- Numerical methods in inverse problems
- Advancements in Materials Engineering
- Advanced Control Systems Optimization
- Photovoltaic System Optimization Techniques
- CCD and CMOS Imaging Sensors
- Structural Engineering and Materials Analysis
- Spacecraft and Cryogenic Technologies
- Subcritical and Supercritical Water Processes
Cracow University of Technology
2016-2025
KU Leuven
2007-2014
Institut Belge pour la Sécurité Routière
2011-2012
Institute of Astronomy
2008-2009
Instituto de Astrofísica de Andalucía
2009
Brera Astronomical Observatory
2009
Centre National de la Recherche Scientifique
2009
Institut d'Astrophysique Spatiale
2009
Université Paris-Saclay
2009
Astrophysique, Instrumentation et Modélisation
2009
Context. OB stars are important building blocks of the Universe, but we have only a limited sample them well understood enough from an asteroseismological point view to provide feedback on current evolutionary models. Our study adds one special case this sample, with more observational constraints than for most these stars. Aims. goal is analyse and interpret pulsational behaviour B3 IV star HD 43317 using CoRoT light curve along ground-based spectroscopy gathered by Harps instrument. This...
<i>Context. <i/> <i>Aims. <i/>This work presents the results obtained by CoRoT on HD 50844, only <i>δ<i/> Sct star observed in initial run (57.6 d). The aim of these observations was to investigate and characterize for first time pulsational behaviour a star, when at level precision with much better duty cycle than from ground.<i>Methods. <i/>The 140 016 datapoints were analysed using independent approaches (SigSpec software different iterative sine-wave fittings) several checks performed...
<i>Context. <i/>The influence of binarity on the late stages stellar evolution remains an open issue.<i>Aims. <i/>While first binary post-AGB stars were serendipitously discovered, distinct characteristics their spectral energy distribution (SED) allowed us to launch a more systematic search for binaries. We selected objects, which exhibit broad dust excess starting either at H or K, pointing presence gravitationally bound dusty disc in system. initiated extensive multiwavelength study those...
Aims.We present the Fourier parameter fit method, a new method for spectroscopically identifying stellar radial and non-radial pulsation modes based on high-resolution time-series spectroscopy of absorption-line profiles. In contrast to previous methods this one permits quantification statistical significance computed solutions. The application genetic algorithms in seeking solutions makes it possible search through large space.
The growing global energy demand, coupled with environmental concerns, necessitates the development of efficient storage technologies. Phase Change Materials (PCMs) have emerged as a promising solution for thermal (TES) due to their ability store and release latent heat during phase transitions. This review provides comprehensive analysis PCMs, exploring classifications based on transition types, chemical compositions, thermophysical properties. Additionally, highlights advancements in...
Aims.We present a mode identification based on new high-resolution time-series spectra of the non-radially pulsating δ Scuti star FG Vir (HD 106384, , A5V). From 2002 February to June global Delta Network (DSN) campaign, utilizing spectroscopy and simultaneous photometry has been conducted for in order provide theoretical pulsation model. In this campaign we have acquired 969 Echelle covering 147 h at six observatories.
Many aspects of the design trade-off a space-based instrument and its performance can best be tackled through simulations expected observations. The complex interplay various noise sources in course observations make such an indispensable part assessment study any mission. We present formalism to model simulate photometric time series CCD images by including models electronics, telescope optics, stellar field, jitter movements spacecraft, all important natural sources. This has been...
This paper presents a seminumerical method for solving inverse heat conduction problems (IHCP) encountered in the monitoring of thermal stresses pressurized thick-walled elements steam boilers. The objective is to give simple and quick determining transient temperature histories components based on measurements outer thermally insulated surface. suitable one-dimensional problems. However, it can be extended multidimensional fields. IHCP will solved using control volume approach. accuracy...
We combine photometric and spectroscopic data on twelve modes excited in FG Vir to determine their spherical harmonic degrees , obtain constraints the star model. The effective temperature consistent with mean colours pulsation is about 7200 K. In six cases, identification unique above 80% probability. Two are identified as radial. Simultaneously we a complex parameter f which probes subphotospheric stellar layers. Comparing its values those derived from models assuming different treatment...
The article presents a one-dimensional mathematical model for simulating the transient processes which occur in liquid flat-plate solar collectors. proposed method considers collector with distributed parameters. In model, boundary conditions can be time dependent. is based on solving equations describe energy conservation glass cover, air gap between cover and absorber, working fluid, insulation. differential derived were solved using implicit finite-difference an iterative scheme. All...
We report the discovery of a new AM CVn system on basis broadband photometry obtained with Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained target lists as potential compact pulsator, blue object SDSS J190817.07+394036.4 (KIC 004547333) has turned out to be high-state star showing He-dominated spectrum its accretion disk significantly reddened interstellar absorption. constructed grids NLTE synthetic spectra for disks in order analyze our spectroscopic...
We present multi-colour time-series CCD photometry of the solar-age galactic open cluster M67 (NGC 2682). About 3600 frames spread over 28 nights were obtained with 1.5 m Russian-Turkish and 1.2 Mercator telescopes. High-precision observations close binary stars AH Cnc, EV ES $\delta$ Scuti type systems EX Cnc EW some long-period variables belonging to are presented. Three full light curves overcontact during three observing seasons. Likewise we gathered an EB-type binary, two a blue...
We present the results of a spectroscopic multisite campaign for β Cephei star 12 (DD) Lacertae. Our study is based on more than thousand high–resolution high S/N spectra gathered with eight different telescopes in time span 11 months. In addition, we make use numerous archival measurements. confirm 10 independent frequencies recently discovered from photometry, as well harmonics and combination frequencies. particular, slowly pulsating B–stars (SPB)–like g–mode frequency 0.3428 d−1 reported...
CONTEXT: Recent progress in the seismic interpretation of field beta Cep stars has resulted improvements physics stellar structure and evolution models massive stars. Further asteroseismic constraints can be obtained from studying ensembles a young open cluster, which all have similar age, distance chemical composition. AIMS: To improve our comprehension stars, we studied cluster NGC 884 to discover new B-type pulsators, besides two known other variable METHODS: An extensive multi-site...
The paper presents a proposal for an in-house mathematical model of liquid flat-plate solar collector. proposed is one-dimensional distributed parameter enabling simulations the collector operation under arbitrarily variable boundary conditions. based on solution energy balance equations all components formulated differential are solved iteratively using implicit difference scheme. In order to obtain stable numerical solution, it necessary use appropriate steps time and spatial division....