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The k p method and its application to graphene, carbon nanotubes and graphene nanoribbons: the Dirac equation

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The k p method and its application to graphene, carbon nanotubes and graphene nanoribbons: the Dirac equation ( the-k-p-method-and-its-application-graphene-carbon-nanotubes )

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Interactive Map http://geoheat.oit.edu/dusys.htm As with other forms of renewable energy, geothermal has historically been dependent upon gov- ernment policy due to the need to compete with established energy. Growth was tremendous from 1978 to 1992 under the Public Utility Regulatory Policies Act (PURPA), explains Karl Gawell, Executive Director of the Geothermal Energy Association. That federal law requires use of renewable energy from independent sources where it is competitive, but lost much of its effect following 1993 changes, leading to a stagnant period for geothermal. In more recent years, Renewable Portfolio Standards (RPS) at the state level, notably in California, have influenced renewable energy far more. However, while PURPA basically pitted renewables against conven- tional energy, RPS initiatives lead renewables to compete with each other, according to Gawell. A credit for wind power in the late 1990s led to a boom in that resource. In 2004 and 2005 RPS legislation was extended to other renewables, boosting geothermal. “The growth curve over the last two years has gone back up,” explains Gawell, who foresees “a return to the boom era of the 1980s, in the range of 20 to 30% annual growth.” An additional advantage for geothermal is that many resources are located near existing power lines, unlike wind and solar thermal (Gawell). Geothermal also provides local jobs, in the U.S. employing approximately 25,000 people in 2008 (Geothermal 101). While this is a relatively small number, future potential is far greater. The Western Governors Association (WGA) estimates that near-term development “of 5,600 MW of geothermal energy would result in the creation of almost 100,000 jobs” (Geothermal 101). Another advantage is that “most producible geothermal resources are located in rural areas, which tend to suffer from economic depression and high unemployment” (Geothermal 101). If technology advances and geothermal continues to expand, eventual job creation could be far greater. ProQuest Discovery Guides http://www.csa.com/discoveryguides/discoveryguides-main.php 8 Goffman: Geothermal Energy Released September 2009

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