1,324 research outputs found
Multiethnic meta-analysis identifies ancestry-specific and cross-ancestry loci for pulmonary function
Bubble kinetics in a steady-state column of aqueous foam
We measure the liquid content, the bubble speeds, and the distribution of
bubble sizes, in a vertical column of aqueous foam maintained in steady-state
by continuous bubbling of gas into a surfactant solution. Nearly round bubbles
accumulate at the solution/foam interface, and subsequently rise with constant
speed. Upon moving up the column, they become larger due to gas diffusion and
more polyhedral due to drainage. The size distribution is monodisperse near the
bottom and polydisperse near the top, but there is an unexpected range of
intermediate heights where it is bidisperse with small bubbles decorating the
junctions between larger bubbles. We explain the evolution in both bidisperse
and polydisperse regimes, using Laplace pressure differences and taking the
liquid fraction profile as a given.Comment: 7 pages, 3 figure
Discovery and fine-mapping of adiposity loci using high density imputation of genomewide association studies in individuals of African ancestry: African Ancestry Anthropometry Genetics Consortium
Fluctuation theorem applied to Dictyostelium discoideum system
In this paper, we analyze the electrotactic movement of Dictyostelium
discoideum from the viewpoint of non-equilibrium statistical mechanics. Because
we can observe fluctuating behavior of cellular trajectories, we analyze the
probability distribution of the trajectories with the aid of the fluctuation
theorem. Recently, the validity of the fluctuation theorem was verified in a
colloidal system, and it has also been applied to granular systems, turbulent
systems and chemical oscillatory waves to investigate some of their statistical
properties that are not yet completely understood. Noting that the fluctuation
theorem is potentially applicable to cellular electrotaxis, here we employ it
to help us obtain a phenomenological model of this biological system.Comment: 2 pages, to appear in J. Phys. Soc. Jp
Mapping with Skysat Images
The very high-resolution space imagery now competes with some functions that were previously solved with aerial images. Several very high-resolution optical satellites with a ground sampling distance (GSD) of 1 m and smaller are currently active. Not all of these satellites take images worldwide. Nevertheless, it is not a problem to obtain up-to-date satellite images with a very high resolution. Mapping projects not only need to consider access and quality, but also cost-effectiveness. Of course, the economic framework conditions are decisive for the decision as to whether space images or very high-resolution satellite images should be used. With a total 21 SkySat satellites, low-cost satellites with very high resolution have changed the economic conditions. To keep costs and weights down, the Skysat satellites were not designed to offer the best direct geo-referencing performance, but this problem can be solved by automatic orientation in relation to existing orthoimages.In North Rhine-Westphalia, the cadastral maps must be checked at regular intervals to ensure that the buildings are complete. A test project examined whether this is possible with SkySat images. The geometric conditions and the image quality with the effective ground resolutions are investigated. Experiences from earlier publications could not be used. First the specific problem had to be solved, the resolution of the SkySat images was improved by lowering the satellite orbit altitude from 500 km to 450 km and by a better super resolution with 0.50 m ground sampling distance for the SkySat Collect orthoimages and in addition Planet improved their generation of Collect images. The required standard deviation of the object details of 4 m was achieved clearly as the effective ground resolution of 0.5 m if the angle of incidence is below 20°
Riqueza e diversidade de palmeiras em floresta de várzea do estuário dos rios Amazonas e Pará.
Status fitossociológico de espécies arbóreas comerciais de florestas de várzea no estado do Pará.
Thermalization of an anisotropic granular particle
We investigate the dynamics of a needle in a two-dimensional bath composed of
thermalized point particles. Collisions between the needle and points are
inelastic and characterized by a normal restitution coefficient . By
using the Enskog-Boltzmann equation, we obtain analytical expressions for the
translational and rotational granular temperatures of the needle and show that
these are, in general, different from the bath temperature. The translational
temperature always exceeds the rotational one, though the difference decreases
with increasing moment of inertia. The predictions of the theory are in very
good agreement with numerical simulations of the model.Comment: 7 pages, 6 Figures, submitted to PRE. Revised version (Fig1, Fig5 and
Fig6 corrected + minor typos
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