We investigate the growth of spiral-arm substructure in vertically stratified, self-gravitating, galactic gas disks, using local numerical MHD simulations. Our new models extend our previous two-dimensional studies (Kim & Ostriker 2002), which showed that a magnetized spiral shock in a thin disk can undergo magnetoJeans instability (MJI), resulting in regularly-spaced interarm spur structures a...

Fuel droplets in combustors interact strongly with flames and turbulence in practical liquid-fueled combustors of terrestrial and aerial propulsion systems (Williams 1965; Sirignano 1999). Although a great deal of physical understanding has been achieved in purely gaseous combustion over the last century, not much is currently known about spray combustion at the fundamental level. In this short...

BACKGROUND Cavitation is a rather common and important effect in the processes of destruction of nano- and microscale particles in natural and technological processes. A possible cavitation disintegration of polymineral nano- and microparticles, which are placed into a liquid, as a result of the interaction of the particles with collapsed cavitation bubbles is considered. The emphasis is put on...

Chemical analysis (including H,, F,, FeO, Fe,O,) of a Mg-vesuvianite from Georgetown, Calif., USA, yields a formula, R . 9 ? M g l . B B F e ~ . ~ 0 A ' 1 0 . ~ 7 S i 1 ~ . 8 1 06,.,,(OH)8.*4~0.,4~ in good agreement on a cation basis with the analysis reported by Pabst (1936). X-ray and electron diffraction reveal sharp reflections violating the space group P4/nnc as consistent with domains hav...

a r t i c l e i n f o Keywords: Market exploration Market exploitation Customer need tacitness New product innovativeness New product development speed New product financial performance This paper examines three different ways to balance market exploration and market exploitation in product innovation. First, following the knowledge-based view, we examine whether market exploration and market e...

The discovery of C-3 tethered 2-oxo-benzo[1,4]oxazines as potent antioxidants is disclosed. All the analogs 20a-20ab have been synthesized via "on water" ultrasound-assisted irradiation conditions in excellent yields (upto 98%). All the compounds have been evaluated for their in vitro antioxidant activities using DPPH free radical scavenging assay as well as FRAP assay. The result showed promis...

Although emotions were, for a long time, considered undesirable for rational behaviour, there are now evidences in neuroscience and psychology that place emotions as an important factor in problem solving capabilities and intelligence in general. Work by Picard and others has created considerable awareness for the role of affect in human‐computer interaction. In fact, a strong new field is emer...

We present a concise outlook of particle physics after the first LHC results at 7-8 TeV. The discovery of the Higgs boson at 126 GeV will remain as one of the major physics discoveries of our time. But also the surprising absence of any signals of new physics, if confirmed in the continuation of the LHC experiments, is going to drastically change our vision of the field. At present the indicati...