Browsing by Author "Franklin, Jennifer"
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- In-situ Synthesis of Piezoelectric-Reinforced Metal Matrix CompositesFranklin, Jennifer (Virginia Tech, 2001-04-20)The in-situ synthesis of piezoelectric-reinforced metal matrix composites has been attempted with a variety of target matrix and reinforcement materials using reaction synthesis and high energy ball milling. Zinc oxide (ZnO) and barium titanate (BaTiO₃) have been successfully synthesized within copper and iron matrices in a range of volume percentages using reaction synthesis. The microstructures of these composites have been analyzed and found to partially consist of an interpenetrating microstructure. After considering experimental findings and thermodynamic issues involved with synthesis, ideal reaction system parameters have been identified that promote the creation of a composite with ideal microstructure and formulated composition. Reactive high energy ball milling has been used to create copper matrix composites reinforced with zinc oxide and copper matrix composites reinforced with lead titanate (PbTiO₃). The microstructures and compositions of each volume percentage formulation of the composite powders have been analyzed. In this work, several promising piezoelectric-reinforced metal matrix composite systems have been identified as having potential to be synthesized in an in-situ manner.
- Piezoelectric ceramic-reinforced metal matrix composites(United States Patent and Trademark Office, 2006-10-24)Composite materials comprising piezoelectric ceramic particulates dispersed in a metal matrix are capable of vibration damping. When the piezoelectric ceramic particulates are subjected to strain, such as the strain experienced during vibration of the material, they generate an electrical voltage that is converted into Joule heat in the surrounding metal matrix, thereby dissipating the vibrational energy. The piezoelectric ceramic particulates may also act as reinforcements to improve the mechanical properties of the composites. The composite materials may be used in various structural components in vehicles, aircraft, spacecraft, buildings and tools.
- Planting Hardwood Tree Seedlings on Reclaimed Mine Land in AppalachiaDavis, Vic; Franklin, Jennifer; Zipper, Carl E.; Angel, Patrick N. (Appalachian Regional Reforestation Initiative, 2010-02)The Forestry Reclamation Approach (FRA) is a method of reclaiming surface coal mines to forested post-mining land use (see Forest Reclamation Advisory No. 2). “Use proper tree planting techniques” is Step 5 of the FRA; when used with the other FRA steps, proper tree planting can help to ensure reforestation success.
- Tree-Compatible Groundcovers for Reforestation and Erosion ControlBurger, James A.; Davis, Vic; Franklin, Jennifer; Zipper, Carl E.; Skousen, Jeffrey G.; Barton, Christopher D.; Angel, Patrick N. (Appalachian Regional Reforestation Initiative, 2009-07)Productive native forests create economic value for landowners, produce raw materials for wood-based products, and provide benefits such as watershed control, water quality protection, carbon storage, wildlife habitat, and native plant diversity. Owners of lands mined for coal in Appalachia are increasingly interested in assuring that productive forests are restored after mining. Sediment control is essential to coal mine reclamation under the Surface Mining Control and Reclamation Act (SMCRA). Here, we describe how mining firms can achieve good tree survival and restore forest productivity by using tree-compatible ground covers, when necessary, to control erosion and meet ground cover standards.