Section IV: Physics, Mathematics, Computer Science and Technology Science Building, Room 104 Andreas Lazari, Presiding (Friday PAPER PRESENTATIONS‪)‬

2:00 DYE-SENSITIZED PHOTOVOLTAIC CELLS USING NATURAL DYES EXTRACTED FROM MONDO GRASS BERRIES **, Victoria Martin *, A DeSilva, J. E. Hasbun, Sharmistha Basu-Dutt and Anne Gaquere, University of West Georgia, Carrollton, GA 30118. Pigment extracted from Mondo Grass (Ophiopogon japonicas) is used to construct a dye-sensitized solid state solar cell of the configuration TiO2/dye/CuI by adsorbing the pigment from an alcoholic solution of pigment onto a TiO2 film and deposition of the hole collector p-CuI. The optical and chemical properties of the dye and photovoltaic characteristics of the cell will be presented. 2:15 LOW FREQUENCY OSCILATIONS IN A PLANAR MATERIAL **, Anton Hud* and Javier E. Hasbun, University of West Georgia, Carrolton, GA 30118. When a specific frequency of sound is applied to a planar material, such as a piece of glass, a wave travels along the length of the material. It is possible to vary the sound frequency in such a way to induce resonance. The property of the material to resonate is dependent on the material's Young's modulus, density, and physical dimensions. These are factors that must be taken into account in any theory that explains the vibrational behavior. There already exists a box used for demonstrating this property of planar materials; however, a unifying theory explaining why the material oscillates at the specific frequency has not been put forth. In previous 1 work we developed a 1st order harmonic theory to explain the vibrations we observed. However, the theory lacked generality. We believe that the Euler-Bernoulli beam theory is better suited to explain our observations. In this presentation, we will present our results from the comparison between theory and experiment (Hud and Hasbun, 2010).