We summarize information concerning Recent and Pleistocene-Holocene Uruguayan sand dollars (Mellitidae), as well as Miocene taxa (Monophorasteridae). Recent and Pleistocene-Holocene species (Encope emarginata, Mellita quinquiesperforata, and Leodia sexisperforata) are at their southernmost limits of distribution, with only E. emarginata recorded further south than Uruguay. Lower temperatures to...

Many larvae and other plankton have complex and variable morphologies of unknown functional significance. We experimentally and theoretically investigated the functional consequences of the complex morphologies of larval sand dollars, Dendraster excentricus (Eschscholtz), for hydrodynamic interactions between swimming and turbulent water motion. Vertical shearing flows (horizontal gradients of ...

The concepts of ‘lesson drawing’ and ‘policy transfer’ have become increasingly influential ways of understanding public policy, especially in the UK. However, the main proponents of the concepts, Rose for ‘lesson drawing’ and Dolowitz and Marsh for ‘policy transfer’, have difficulty in providing convincing answers to three questions that are important for them and those engaged in similar stud...

This young man presented initially and repeatedly over a period of twenty years with symptoms of irritability, depressed and withdrawn mood, impulsivity, out-of-control behavior, and suicidal ideation and behavior. These symptoms occurred with disabling intensity at ages 3 year, 6 1/2 years, and 8 1/2 years, when he had not yet been adequately diagnosed and treated with appropriate psychopharma...

Sand dripping in 1 dimensional Sand Pile Model is rst studied. Patterns and signals appear. Their behaviors and interactions are explained and asymptotic approximations are made. The total collapsing time of a single stack of sand is linear in function of the number of grains.

To study the attenuation and dispersion effect of a new protective structure distribution layer constructed with hollow particle composite material on shock wave, similar model field explosion test was carried out in this paper. The numerical simulation tests under different conditions by using finite element program 3D/LS-DYNA results were used for verification. experimental showed that same c...