ABSTRACT Supermassive black hole binaries are driven to merger by dynamical friction, loss-cone scattering of individual stars, disc migration, and gravitational wave emission. Two main formation scenarios expected. Binaries that form in gas-poor galactic environments do not experience migration likely enter the wave-dominated phase with roughly isotropic spin orientations. Comparatively, evolv...

Effect of porosity on grain growth is both the most frequent and technologically important situation encountered in ceramic materials. Generally this effect occurs during sintering, however, for nuclear fuels it also becomes very important under reactor irradiation conditions. In these cases pores and gas bubbles attached to the grain boundaries migrate along with the boundaries, in some circum...

A one-dimensional multiphase numerical model is developed to simulate the vertical settlement involving liquid and gas flows in a deformable settling municipal solid waste MSW landfill. MSW is represented by a chemical composition, and a global stoichiometric reaction is used to estimate the maximum yield of gas generation. Following the general assumption accepted in the literature, the gas ge...

Parallelization of genetic algorithms (GAs) has received considerable attention in recent years. The reason for this is the availability of suitable computational resources and the need for solving harder problems in reasonable time. We describe a new parallel self-adaptive GA for solving the data clustering problem. The algorithm utilizes island parallelization implemented using genebank model...

Endocannabinoid 2-arachidonoylglycerol (2-AG) regulates several important physiological processes in the brain. 2-AG is commonly quantified by gas chromatography mass spectrometry after an initial purification step. The most precise and rapid purification utilizes C(18) solid-phase extraction, but quantification problems can arise with acyl migration from 2-AG to 1-arachidonoylglycerol. We foun...

Prospecting for oil and gas resources poses the problem of determining the geological structure of the earth's crust from indirect measurements. Seismic migration is an acoustic image reconstruction technique based on the inversion of the scalar wave equation. Extensive computation is necessary before reliable information can be extracted from large sets of recorded data. In this article, a col...