We examined the first arrival dates in the UK over a 56 yr period of 2 hirundines, sand martin Riparia riparia and barn swallow Hirundo rustica, in relation to temperatures along migration routes and at destination. Changes in arrival dates have been much greater for sand martin than for barn swallow, and the arrival order of the 2 species now appears to have reversed. There appear to be 2 reas...

The effective implementation of in situ thermal treatment (ISTT) technologies requires understanding gas production and migration heterogenous media. However, investigations the effects high permeability contrast on formation, accumulation, migration, as well its potential effect redistribution dense non-aqueous phase liquid (DNAPL), are relatively rare. In this study, electrical resistance hea...

Complex life cycles have evolved independently numerous times in marine animals as well as in disparate algae. Such life histories typically involve a dispersive immature stage followed by settlement and metamorphosis to an adult stage on the sea floor. One commonality among animals exhibiting transitions of this type is that their larvae pass through a 'precompetent' period in which they do no...

Abstract Sand or fine is a typical product in many processing of oil production from unconsolidated and weakly consolidated formations. High variation situ stress, fluid rate above maximum sand-free rate, water are main primary sources the sand production. can cause hazardous operational problems to facilities, pipes, wellbore. Hence, it significant problem that requires be managed studied. To ...

Results are presented from the ongoing international study, namely Chernobyl Pilot Site Project, aimed at characterization and modeling of process controlling Sr releases from the shallow trench at Chernobyl NPP site containing nuclear fuel particles and subsequent radionuclide transport in the underlying eolian and alluvial sand aquifer. Microscopic analyses of fuel particles separated from wa...

Shorebirds wade in shallow waters along shorelines searching for food. More than a million shorebirds visit the San Francisco Estuary each year during their migration to feast on insects, worms, clams, and crabs that live or under surface of sand mud. The abundant food provides with energy they need migrate thousands kilometers, between breeding areas Arctic wintering Pacific coast North South ...

Soil heterogeneity is an important driver of divergent natural selection in plants. Neotropical forests have the highest tree diversity on earth, and frequently, soil specialist congeners are distributed parapatrically. While the role of edaphic heterogeneity in the origin and maintenance of tropical tree diversity is unknown, it has been posited that natural selection across the patchwork of s...

The migration of liquids in porous media, such as sand, has been commonly considered at high saturation levels with liquid pathways at pore dimensions. In this Letter, we reveal a low saturation regime observed in our experiments with droplets of extremely low volatility liquids deposited on sand. In this regime, the liquid is mostly found within the grain surface roughness and in the capillary...