63 citations · 237 across the 24 of their papers we have counts for
5 papers · 1 filter
Determination of the Hubble Constant Using Cepheids
Mohamed Abdel-Sabour, Mohamed Ebrahim Nouh, Issa Ali Issa +5
This paper introduces a statistical treatment to use Cepheid variable stars as distance indicators. The expansion rate of the Universe is also studied here through deriving the val…
Properties of Soft Semi-open and Soft semi-closed Sets
Sabir Hussain
Molodstov[10] introduced soft set theory as a new mathematical approach for solving problems having uncertainties. Many researchers worked on the findings of structures of soft set…
Computational Algorithm for Orbit and Mass Determination of Visual Binaries
Mohamed Sharaf, Mohamed Nouh, Abdel Naby Saad +2
In this paper we introduce an algorithm for determining the orbital elements and individual masses of visual binaries. The algorithm uses an optimal point, which minimizes a specif…
Periodic Radio Continuum Emission Associated with the beta Cephei Star V2187 Cyg
Mauricio Tapia, Luis F. Rodriguez, Gagik Tovmassian +4
We present new optical time-resolved photometry and medium-resolution spectroscopy of V2187 Cyg. We confirm its classification as a beta Cephei star based on sinusoidal light varia…
Analysis on the Invariant Properties of Constitutive Equations of Hydrodynamics in the Transformation between Different Reference Systems
Jun Li
The velocities of the same fluid particle observed in two different reference systems are two different quantities and they are not equal when the two reference systems have transl…