ABSTRACT Formation process(es) of galactic bulges are not yet clarified, although several mechanisms have been proposed. In a previous study, we suggested one possibility that formed from the cold gas inflowing through surrounding hot halo in massive dark matter haloes at high redshifts. It was shown this scenario leads to bulge-to-total stellar mass ratio increasing with galaxy mass, agreement...

Effect of temperature on formability of AA6063 aluminum tubes in incremental forming process was investigated. Experiments are performed on AA6063 aluminum tubes. A spirally moving tool incrementally expands the tube wall. The tube is clamped from both ends while the deformation zone is not in contact with the die. A circumferential heating system is used to heat the tube due to the low formabi...

Abstract. We present mass distributions obtained from near-infrared (NIR) surface brightness decompositions and rotation curve fitting of a sample of early-type spiral galaxies. Bulge and disk mass-to-light (M/L) ratios, dark halo parameters, and the modified Newtonian dynamics (MOND) acceleration parameter are derived. We find that the mean disk NIR M/L is higher than that of the bulge, and co...

One of the central features of the last 8 to 10 billion years of cosmic history has been the emergence of a wellpopulated red sequence of non-star-forming galaxies. A number of models of galaxy formation and evolution have been devised to attempt to explain this behavior. Most current models require feedback from supermassive black holes (AGN feedback) to quench star formation in galaxies in th...

By means of extensive galactic modeling we study the implications of the more than eighty microlensing events that have now been observed for the composition of the dark halo of the Galaxy, as well as for other properties of the Galaxy. We take the Galaxy to be comprised of luminous and dark disk components, a bulge, and a dark halo consisting of both MACHOs and cold dark matter with each compo...

A set of four RNA hairpin helices has been prepared by in vitro transcription with T7 RNA polymerase. The hairpins all contain the same nine base pair helix, but with an extra A, C, or U residue forming a bulge at one position; the fourth hairpin is a perfect helix with no bulge. The helix with a bulged A duplicates six base pairs of a helix in the 16S rRNA known to have an unusually high affin...

Numerical simulations of sheet metal forming processes need the establishment of highly reliable results, which in turn need the accurate identification of mechanical properties. In this paper a study is presented on the choice of the characterization function of flow stress-strain curve of sheet metal materials, as well as the selection of the best yield locus, based on experimental uniaxial t...

Abstract The sheet metals are prone to large plastic deformation during forming processes. study purpose is investigate 1050A aluminum sheets thermomechanical behavior with ductile damage. A modified Swift model coupled isotropic damage and thermal effects was used. parameters introduced using coefficients Erichsen index. An inverse identification procedure applied non-homogeneous test results....

We revisit the stellar velocity distribution in Galactic bulge/bar region with Apache Point Observatory Evolution Experiment DR16 and Gaia DR2, focusing particular on possible high-velocity (HV) peaks their physical origin. fit distributions two different models, namely Gauss–Hermite polynomials Gaussian mixture models (GMMs). The result of using reveals a positive correlation between mean () "...