Based on a suite of Monte Carlo simulations, I show that a stellar-massdependent lifetime of the gas disks from which planets form can explain the lack of hot Jupiters/close-in giant planets around high-mass stars and other key features of the observed semimajor axis distribution of radial velocity-detected giant planets. Using reasonable parameters for the Type II migration rate, regions of pl...

Ion-molecule reactions between molecular oxygen and peptide radicals in the gas phase demonstrate that radical migration occurs easily within large biomolecules without addition of collisional activation energy.

The Blake Ridge Diapir is the southernmost of a line of salt diapirs along the Carolina trough. Diapirs cause faulting of the superjacent sediments, creating pathways for migration of fluids and gas to the seafloor. We analyzed reflection seismic data from the Blake Ridge Diapir, which is located in a region with known abundant gas hydrate occurrence. A striking feature in these data is a signi...

Gravitational torques between a planet and gas in the protoplanetary disk result in orbital migration of the planet, and modification of the disk surface density. Migration via this mechanism is likely to play an important role in the formation and early evolution of planetary systems. For masses comparable to those of observed giant extrasolar planets, the interaction with the disk is strong e...

Gravitational torques between a planet and gas in the protoplanetary disk result in orbital migration of the planet, and modification of the disk surface density. Migration via this mechanism is likely to play an important role in the formation and early evolution of planetary systems. For masses comparable to those of observed giant extrasolar planets, the interaction with the disk is strong e...

Résumé. The two test cases presented herein aimed at simulating the transport migration of nuclides around a nuclear waste repository and belong to the "Two-Phases Numerical Test Data Base" presented in [1], [2]. They were initially designed in the framework of the French research group MoMaS [3]. The starting point in designing all the test cases presented in [1] comes from some of the main ch...

The spawning migration of the European eel is an extensive journey over 5000 to 7000 km from the European coast to the Sargasso Sea. Eels do not feed during this journey and on-board fuels must be sufficient to support the journey of 3.5 to 6 month, as well as sexual maturation and the spawning activity. Swimming of eels appears to be quite energy efficient compared to other fish species, and e...

In this paper, we further develop the model for the migration of planets introduced in Del Popolo et al. (9) and extended to time-dependent planetesimal accretion disks in Del Popolo & Ekcsi (10). More precisely, the assumption of Del Popolo & Ekcsi (10) that the surface density in planetesimals is proportional to that of gas is released. Indeed, the evolution of the radial distribution of soli...

By a Computational Fluid Dynamics software named Fluent, the influence that the permeability, gas emission intensity of goaf and turbulent parameters in working face have on the numerical simulation was studied. The results show that: the permeability and gas emission intensity of goaf have great influence on the migration law of gas and goaf air leakage, causing great impact on the gas concent...

One of the primary public concerns with new development of shale and other unconventional gas resources is potential contamination of shallow groundwater with natural gas (largely methane). Natural gas contamination of shallow groundwater can result from leaky gas production wellbores (e.g. Stein et al., 2003; Van Stempvoort et al., 2005). However, there is also concern that hydraulic fracturin...