Fen Fakültesi: Recent submissions
Now showing items 201-220 of 236
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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 ... -
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 ... -
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 ... -
Paving Luteolin Therapeutic Potentialities and Agro-FoodPharma Applications: Emphasis on In Vivo Pharmacological Effects and Bioavailability Traits
(Hindawi, 2021)Luteolin is a naturally occurring secondary metabolite belonging to the class of flavones. As many other natural flavonoids, it is often found in combination with glycosides in many fruits, vegetables, and plants, contributing ... -
Enzyme Catalyzed Synthesis of Water Soluble Mesalazine Oligomers and Evaluation of their Efficiency in Polypropylene Stabilization
(Springer, 2021)5-Aminosalicylic acid, also known as mesalazine, was oxidized via biocatalytic pathway using Horseradish Peroxidase as catalyst. The spectroscopic measurement results indicated that amine and hydroxyl groups in monomer ... -
Gökçeada Salt Lake: a CaseStudy of Seasonal Dynamics of Wetland Ecological Communities in the Context of Anthropogenic Pressure and Nature Conservation
(Springer, 2021)Gökçeada Salt Lake (GSL) (Gökçeada Island, North Aegean Sea) is an important wetland area situated on established bird migratory routes. The waterbody is subject to significant variability in seasonal water quality and ... -
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) ... -
Biodiverse Properties of Tannic Acid-Based Fibers
(Springer, 2021)Tannic acid (TA) is a plant-based polyphenolic molecule with enticing anti-oxidant, anti-bacterial, antiinflammatory and anti-cancer features, making it a valuable material in bio-medicinal applications. To establish whether ... -
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 ... -
Sensitive Electrochemical Determination of Trifluralin at a Disposable Pencil Graphite Electrode
(Wiley, 2021)A sensitive differential pulse (DP) voltammetric method has been proposed for the determination of trifluralin (TFA) based on both its reduction and oxidation at a disposable pencil graphite electrode (PGE). DP voltammograms ... -
Synthesis, Characterization, Thermal Behavior, and Dielectric Properties of Methacrylate Polymers Containing Imine Bonding
(Springer, 2021)Two diferent Schif bases, viz. 1-{4-[(5-bromo-2-hydroxybenzyliden)amino]phenyl}ethanone (5-Br-2HBAPE) and 1-{4-[(4-hydroxybenzylidene)amino]phenyl}ethanone (4-HBAPE), have been prepared by condensation of 5-bromosalicylaldehyde ... -
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 ... -
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; ... -
Comparative Toxicity of Alpha and Gamma Iron Oxide Nanoparticles in Rainbow Trout: Histopathology, Hematology, Accumulation, and Oxidative Stress
(Springer, 2021)In this study, alpha and gamma iron oxide nanoparticles, characterizations, toxic effects after being exposed to rainbow trout (Oncorhynchus mykiss) at 0, 1, 10 and 25 mg/L concentrations for 10 days, and then 10-day ... -
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 ... -
A Pharmacological Perspective on Plant‑derived Bioactive Molecules for Epilepsy
(Springer, 2021)Epilepsy is a related chronic neurological condition of a predisposition for recurrent epileptic seizures, with various manifestations and causes. Although there are antiepileptic drugs, complementary natural therapies are ... -
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 ... -
Four New Eclipsing Binary Systems in the TESS field: CD-34 13220, HD 295082, TYC 6484-426-1 and TYC 6527-2310-1
(IOP Publishing, 2021)We present the first evidence for the binarity of four targets in the TESS field. The temperatures are estimated by SED analysis and the orbital periods are determined. The TESS light curves of the systems are analyzed ... -
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 ... -
Comparative study on oxidative and enzyme catalyzed oxidative polymerization of aminophenol compound containing dihalogen
(Springer, 2021)Properties of polymers were obtained by enzyme catalyzed oxidative polymerization varies according to oxidative polymerization products and thus polymeric materials with diferent properties are obtained. In this study, ...
