I consider a sample of eight pressure-supported low-surface brightness galaxies in terms Milgrom's modified Newtonian dynamics (MOND). These objects include seven nearby dwarf spheroidal -- Sextans, Carina, Leo II, Sculptor, Draco, I, Fornax, and the ultra-diffuse galaxy DF44. The are modelled as Milgromian isotropic isothermal spheres characterised by two parameters that constrained observatio...

Abstract The quadruple image configurations of gravitational lenses with vanishing ellipticity are examined. Even though such asymptotically approach circularity, the stable if position source relative to diamond caustic is held constant. solutions a quartic equation, an “asymptotically circular lens equation,” parameterized by single complex quantity. Several alternative parameterizations Rela...

We consider a time-like geodesics in the background of rotating Einstein-Born-Infeld (EBI) black hole to examine horizon and ergosphere structure. The effective potential that governs particle's motion spacetime innermost stable circular orbits (ISCO) is also studied. A qualitative analysis conducted find redshifted ultrahigh centre-of-mass (CM) energy as result two-particle collision specifica...

This paper presents the results of experimental measurements and computational fluid dynamics (CFD) simulations of the indoor environment of an open-plan office. The measurements were conducted in the Indoor Environment Research Facility (IERF) at IRC/NRC, in which six mock-up were setup to simulate an interior open-plan office. Two scenarios were investigated: isothermal and non-isothermal. Th...

We investigate the anti-correlation between faint high redshift QSOs and low-redshift galaxy groups found by Boyle, Fong & Shanks (1988), on the assumption that it is caused by gravitational lensing of a flat QSO number count, rather than by dust in the galaxy groups, or any other systematic effect. Using an isothermal sphere lens model, the required velocity dispersion is σ = 1286 −91 km s −1....

In this paper a transient free convection flow around a sphere with variable surface temperature and embedded in a porous medium has been considered. The temperature of the sphere is suddenly raised and subsequently maintained at values that varies with position on surface. The method of asymptotic expansions is applied for small Rayleigh numbers and then a finite-difference scheme is used to s...