Browsing Fizik Bölümü Koleksiyonu by Issue Date
Now showing items 1-20 of 42
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BVRI Photometric Observations, Light Curve Solutions and Orbital Period Analysis of BF Pav
(IOP Publishing, 2021)A new ephemeris, period change analysis and light curve modeling of the W UMa-type eclipsing binary BF Pav are presented in this study. Light curves of the system taken in BVRI filters from two observatories, in Australia ... -
Absolute parameters of young stars: PU Pup
(IOP Publishing, 2021)We present combined photometric and spectroscopic analyses of the southern binary star PU Pup. High-resolution spectra of this system were taken at the University of Canterbury Mt. John Observatory in the years 2008 and ... -
Observational and Theoretical Studies of 27 delta Scuti Stars with Investigation of the Period-Luminosity Relation
(IOP Publishing, 2021)The multi-color CCD photometric study of 27 δ Scuti stars is presented. By using approximately three years of photometric observations, we obtained the times of maxima and magnitude changes during the observation time ... -
An investigation of the causal relationship between sunspot groups and coronal mass ejections by determining source active regions
(Royal Astronomical Society, 2021)Although the source active regions of some coronal mass ejections (CMEs) were identified in CME catalogues, vast majority of CMEs do not have an identified source active region. We propose a method that uses a filtration ... -
A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020
(Oxford University Press, 2021)We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency ... -
Can Solar Cycle 25 Be a New Dalton Minimum?
(Springer, 2021)The aim of this study is to predict solar activity for the next 10 years (Solar Cycle 25) using a deep learning technique known as a stateful Long Short-Term Memory (LSTM) network. To achieve this goal the number of daily ... -
Standard stellar luminosities: what are typical and limiting accuracies in the era after Gaia?
(Oxford University Press, 2021)Methods of obtaining stellar luminosities (L) have been revised and a new concept, standard stellar luminosity, has been defined. In this paper, we study three methods: (i) a direct method from radii and effective temperatures; ... -
On the zero point constant of the bolometric correction scale
(Oxford University Press, 2021)Arbitrariness attributed to the zero-point constant of the V-band bolometric corrections (BCV) and its relation to ‘bolometric magnitude of a star ought to be brighter than its visual magnitude’ and ‘bolometric corrections ... -
Optimization applied to selected exoplanets
(Springer, 2021)Transit and radial velocity models were applied to archival data in order to examine exoplanet properties, in particular for the recently discovered super-Earth GJ357b. There is however considerable variation in estimated ... -
Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme
(American Physical Society, 2021)We investigate the axial-vector nucleon-to-delta transition form factors in the framework of relativistic baryon chiral perturbation theory at the one-loop order using the complex-mass renormalization scheme. We determine ... -
The First Light Curve Solutions and Period Study of BQ Ari
(Springer, 2021)The first analysis of the photometric observation in BVR filters of a W UMa type binary system BQ Ari was performed. Light curve analysis was performed using Wilson-Devinney (W-D) code combined with a Monte Carlo (MC) ... -
Cylindrically symmetric unimodular f(R) black holes
(World Scientific Publishing, 2021)In this paper, we examine massless scalar field by using unimodular f(R) theory. It is taken into account unimodular and cylindrically symmetric spacetime which provides convenience in researching black hole. The field ... -
Quantitative Phase Imaging of Thin Film Surface
(Polish Acad Sciences Inst Physics, 2021)In this study, the white light diffraction phase microscopy and the generalized Morse wavelet are proposed to achieve practical and precise measurement of a thin film surface. The white light diffraction phase microscopy ... -
Optimization of chemically sprayed ZnS films by Mn doping
(Elsevier, 2021)In this study, undoped and Mn doped ZnS films were grown on microscope glass substrates at substrate tem- perature of 400 ± 5 ◦C by using a low cost Ultrasonic Spray Pyrolysis technique, and the effect of Mn doping on some ... -
Heat flow enhancement in a nanoscale plasmonic junction induced by Kondo resonances and electron-phonon coupling
(Elsevier, 2021)Recently, we showed that plasmon-exciton coupling can increase entropy current through a bridge coupled to plasmonic metal nanoparticles. Here we show that electron-phonon coupling can also be used to control the entropy ... -
Optical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449
(Oxford University Press, 2021)We present the results of a search for optical candidates of ultraluminous X-ray sources (ULXs) in two dwarf galaxies, NGC 4861 and NGC 4449, using Hubble Space Telescope (HST) archival data. With precise astrometry, we ... -
Application of quantum self-frictional nonperturbative theory for the study of atomic anharmonic oscillator potentials and their arbitrary derivatives
(Springer, 2021)The self-frictional (SF) nonperturbative theory, introduced by one of the authors, is used for the evaluation of the V-(pl*()) and V-(alpha*) atomic anharmonic oscillator potentials and their derivatives, where p(l)* = 2l ... -
Achieving Predictive Description of Negative Differential Resistance in Molecular Junctions Using a Range-Separated Hybrid Functional
(Wiley-VCH Verlag, 2021)Range-separated hybrid (RSH) functionals have been recently used to overcome the tendency of traditional density functional theory (DFT) calculations to overestimate the conductance of molecular junctions. Non-equilibrium ... -
CTRAMER: An open-source software package for correlating interfacial charge transfer rate constants with donor/acceptor geometries in organic photovoltaic materials
(American Institute of Physics Inc., 2021)In this paper, we present CTRAMER (Charge-Transfer RAtes from Molecular dynamics, Electronic structure, and Rate theory)-an open-source software package for calculating interfacial charge-transfer (CT) rate constants in ... -
Photometric and period analysis of the eclipsing binary system V2783 Ori
(Astronomical Institute, Slovak Academy of Sciences, 2021)In this study we performed the first detailed photometric and period analysis of the recently discovered eclipsing binary star V2783 Ori. The analysis of the light curve has shown that the system is in a detached configuration, ...
