Piezoelectricity of Cholesteric Elastomers

We consider theoretically the properties of piezoelectricity in cholesteric elastomers. We deduce using symmetry considerations the piezoelectric contributions to the free energy in the context of a coarse-grained description of the material. In contrast to previous work we find that compressions or elongations of the material along the pitch axis do not produce a piezoelectric response, in agreement with fundamental symmetry considerations. Rather only suitable shear strains or local rotations produce a polarization. We propose some molecular mechanisms to explain these effects.Comment: 11 pages, 1 Postscript figure; Late

Evaluation of Plantings for Wildlife on a Power Line Right of Way in Southern Arkansas

The combination of types of land preparation and species of plants seeded along a power line right-of-way was evaluated in terms of the effects upon wildlife. Relative population densities of plants, birds, and mammals were determined for each of the areas under study. A study of the reduction in maintenance costs in relation to the initial investment for preparation and seeding of the land was mad

Chapter II-2 - Edward S. Morse grows up

In which teenage Edward S. Morse of Salem, Massachusetts, begins a life-long love affair with shells, leaves home for Boston, studies with Louis Agassiz at the Museum of Comparative Zoology in Cambridge, and becomes the world's leading authority on brachiopods (by proving conclusively that these tiny creatures are not mollusks, but worms), and how these same brachiopods lead him, at the age of thirty-nine, to Japan