Results 1 to 10 of about 49,683 (297)

Thermodynamic and structural studies of complexes of manganese(II), cobalt(II), nickel(II) and copper(II) with aminofuropyridine carboxamide [PDF]

open access: yesJournal of the Serbian Chemical Society, 2003
Complexes of Mn(II), Co(II), Ni(II) and Cu(II) with 2-aminofuro[3,2-b]pyridine-3-carboxamide have been prepared. The stability constants of the formed complexes were determined at 20, 30, 40 and 50ºC at a fixed ionic strength, I = 0.1 mol dm-3 (KCl). The
M. G. ABD EL WAHED
doaj   +3 more sources

The New Ephemeris and Light Curve Analysis of V870 Ara by the Ground-Based and TESS Data

open access: yesOpen Astronomy, 2021
New CCD photometric observations and their investigation of the W UMa-type binary, V870 Ara, are presented. Light curves of the system were taken through BVIfilters from the Congarinni Observatory in Australia.
Poro Atila   +6 more
doaj   +1 more source

An Attempt to Construct an Activity Cycle Catalog with Kepler Long-Cadence Light Curves

open access: yesUniverse, 2022
Many stars show activity cycles like the Sun. Kepler has gathered ∼200,000 light curves. Most of the Kepler stars only have long-cadence light curves, which limits their applicable methods.
Yu-Fu Shen, Gang Zhao, Sarah A. Bird
doaj   +1 more source

Comparative Study of Light Sources for Household

open access: yesManagement Systems in Production Engineering, 2017
The article describes test results that provided the ground to define and evaluate basic photometric, colorimetric and electric parameters of selected, widely available light sources, which are equivalent to a traditional incandescent 60-Watt light bulb.
Pawlak Andrzej, Zalesińska Małgorzata
doaj   +1 more source

Variations of the Ratio of Total-To-selective Extinction in the Galaxy

open access: yesOpen Astronomy, 2003
The results of the study of variations of total-to-selective extinction RV near the Galactic plane (-12° ≤ b ≤+12°) are presented. It is shown that variations of RV range from 1.9 to 3.4 and it is not possible to determine its typical value for the ...
Sūdžius J., Raudeliūnas S.
doaj   +1 more source

METHOD FOR EVALUATING THE ASTROMETRIC AND PHOTOMETRIC CHARACTERISTICS OF COMMERCIAL SCANNERS IN THEIR APPLICATION FOR THE SCIENTIFIC PURPOSE

open access: yesOdessa Astronomical Publications, 2014
Method  for estimating the accuracy of astrometric  (rectangular coordinates) and photometric (diameters and magnitudes) characteristics of commercial scanners is proposed and applied.
Yu. I. Protsyuk   +10 more
doaj   +1 more source

Combining Aperture and PSF-Fitting Photometry

open access: yesOpen Astronomy, 2003
The multiple object and multiple frame (MOMF) CCD photometry package, that combines the advantages of aperture and PSF photometry is described. Results from comparisons with other programs are given; no other photometry package was found to give better ...
Handler G.
doaj   +1 more source

On the Accuracy of Gaia Photometry

open access: yesOpen Astronomy, 2003
The errors of Gaia photometry originating from tolerancies of the light filter mean wavelengths and half-widths are investigated.
Abromavičius G.   +3 more
doaj   +1 more source

Recent UBVR Photometry of Symbiotic Stars

open access: yesOpen Astronomy, 2003
We present recent photometric observations of Z And, BF Cyg, and AX Per made in the standard Johnson UBVR system. The main characteristics of their light behavior can be summarized as follows: Z And: our observations cover the recent active phase, from ...
Skopal A.   +3 more
doaj   +1 more source

On the Data Reduction of WET Observations

open access: yesOpen Astronomy, 2003
It is demonstrated how the length of a continuous time-series of photometric data and their gaps affect the power spectrum of a Fourier Transform of the data.
Pakštienė Erika
doaj   +1 more source

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