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PREFACE The impetus for this report came from a workshop organized by the Center for Sustainable Systems entitled " A Life Cycle Approach to Sustainable Agriculture Indicators, " held February 26-27, 1999. The workshop brought together 60 participants including organic and conventional farmers, agri-business representatives, state and national level(More)
Travel patterns from survey data are combined with naturalistic drive cycles. More realistic PHEV energy modeling using these synthesized real-world drive cycles. Methodology is demonstrated for PHEVs in Michigan but applicable for other regions. Energy and emissions findings have major implications for PHEV standards and policy. a b s t r a c t Plug-in(More)
Concrete infrastructure represents an enormous investment of materials, energy, and capital, and results in significant environmental burdens and social costs. There is an ongoing effort to identify material alternatives to conventional concrete. Life cycle assessment ͑LCA͒ is an important tool to evaluate the environmental performance of alternative(More)
Over the last decade, enormous strides have been made in creating engineered cementitious composites (ECC) with extreme tensile ductility, on the order of several hundred times that of normal concrete or fiber reinforced concrete (FRC). Current ECC investigations include load carrying structural members in new infrastructure systems, as well as for repair(More)
Algae are an appealing source for bioenergy due to their high yields relative to terrestrial energy crops. The high cost of production, however, has prohibited commercialization. Hydrothermal liquefaction is a technology that converts more of the algae into oil than alternative technologies, thereby reducing the amount of expensive pond infrastructure and(More)
Purpose This study aims to compare the life cycle greenhouse gas (GHG) emissions of two cellulosic bioenergy pathways (i.e., bioethanol and bioelectricity) using different references and functional units. It also aims to address uncertainties associated with a comparative life cycle analysis (LCA) for the two bioenergy pathways. Methods We develop a(More)
Traditionally, the foremost concern among transportation engineers has been the safety and reliability of major infrastructure components. Until recently, sustainability has not been included in most infrastructure systems on any level. However, the engineering community, along with society as a whole, is realizing the importance of sustainability-oriented(More)