We report a possible occurrence of horizontal roll vortices over the Adriatic Sea during the bora wind. The National Center for Atmospheric Research Electra aircraft measured the turbulence structure above the Adriatic on 07 November 1999 during the Mesoscale Alpine Program. The data indicate that horizontal roll vortices are generated by the strong cold-air outbreak associated with bora. The r...

We report on the dynamics and structure of the turbulent velocity field in a high-Rayleigh-number (Ra = 5.9 x 10(8))thermal convection cell with an aspect ratio of 4. Spectral density functions (measured with laser Doppler velocimetry) indicated the existence of a large-scale periodic component. The long-time mean flow field (measured with particle image velocimetry) revealed that the large-sca...

In rolls manufactured from first bent and then welded sheets of steel, the asymmetric distribution mass due to weld seam as well imperfections geometry bending may cause roll cross-section roundness profiles deform centrifugal forces when is accelerated rotate at its operating speed. This effect known dynamic roll. previous research, it has been shown that possible measure in speed compensate f...

Cryptic habitats are often overlooked in biodiversity surveys. Phytotelmata, or plant pools, one type of cryptic habitat that supports diverse fauna a miniature ecosystem. This study surveys the arthropod community two types phytotelmata, bracts and leaf rolls, on single species, Calathea capitata (Ruiz Pav.) Lindl. (Zingiberales: Marantaceae), from Amazon site Peru. Specimens were collected ei...

We observe a new type of behavior in a shear-thinning yield stress fluid: freestanding convection rolls driven by vertical oscillation. The convection occurs without the constraint of container boundaries, yet the diameter of the rolls is spontaneously selected for a wide range of parameters. The transition to the convecting state occurs without hysteresis when the amplitude of the plate accele...

Boundaries between domains of traveling waves are studied in convection in an 8% mixture of ethanol and water. A con guration is described in which rolls move in opposite directions on either side of a domain wall. Demodulation techniques are used to measure the interaction of waves across the boundary. It is found that rolls approaching the boundary with an oblique angle of incidence are re ec...

A dorsal light reflex is described in the squid Lolliguncula brevis. When illuminated from the side in visually homogeneous surroundings, a free-swimming squid rolls the dorsal side of its head and trunk 10-20 degrees towards the light. With the trunk restricted in a holder, the squid rolls its head 4-5 degrees towards the light; this reaction increases by about 50% when the statocysts are bila...

We give an implementation of an algorithm that uses fair coin flips to simulate fair rolls of an n-sided die. A register plays the role of an entropy pool and holds entropy that is generated as a by-product during each die roll and that is usually discarded. The entropy stored in this register is completely reused during the next rolls. Consequently, we can achieve an almost negligible loss of ...

We consider the transition from a spatially uniform state to a steady, spatiallyperiodic pattern in a partial differential equation describing long-wavelength convection [1]. This both extends existing work on the study of rolls, squares and hexagons and demonstrates how recent generic results for the stability of spatially-periodic patterns may be applied in practice. We find that squares, eve...

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