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  1. Working With the Federal Fleets (Presentation)

    Presentation about federal fleet data, working with the federal government, and results from a survey of Clean Cities coordinators about their experiences with regulated fleets.
  2. Refueling Behavior of Flexible Fuel Vehicle Drivers in the Federal Fleet

    Federal fleets are a frequent subject of legislative and executive efforts to lead a national transition to alternative fuels and advanced vehicle technologies. Section 701 of the Energy Policy Act of 2005 requires that all dual-fueled alternative fuel vehicles in the federal fleet be operated on alternative fuel 100% of the time when they have access to it. However, in Fiscal Year (FY) 2012, drivers of federal flex fuel vehicles (FFV) leased through the General Services Administration refueled with E85 24% of the time when it was available--falling well short of the mandate. The U.S. Department of Energy's National Renewablemore » Energy Laboratory completed a 2-year Laboratory Directed Research and Development project to identify the factors that influence the refueling behavior of federal FFV drivers. The project began with two primary hypotheses. First, information scarcity increases the tendency to miss opportunities to purchase E85. Second, even with perfect information, there are limits to how far drivers will go out of their way to purchase E85. This paper discusses the results of the project, which included a June 2012 survey of federal fleet drivers and an empirical analysis of actual refueling behavior from FY 2009 to 2012. This research will aid in the design and implementation of intervention programs aimed at increasing alternative fuel use and reducing petroleum consumption.« less
  3. Optimizing Federal Fleet Vehicle Acquisitions: An Eleven-Agency FY 2012 Analysis

    This report focuses on the National Renewable Energy Laboratory's (NREL) fiscal year (FY) 2012 effort that used the NREL Optimal Vehicle Acquisition (NOVA) analysis to identify optimal vehicle acquisition recommendations for eleven diverse federal agencies. Results of the study show that by following a vehicle acquisition plan that maximizes the reduction in greenhouse gas (GHG) emissions, significant progress is also made toward the mandated complementary goals of acquiring alternative fuel vehicles, petroleum use reduction, and alternative fuel use increase.
  4. Executive Order 13514: Federal Leadership in Environmental, Energy, and Economic Performance; Comprehensive Federal Fleet Management Handbook (Book)

    A comprehensive Federal Fleet Management Handbook that builds upon the "Guidance for Federal Agencies on E.O. 13514 Section 12-Federal Fleet Management" and provides information to help fleet managers select optimal greenhouse gas and petroleum reduction strategies for each location, meeting or exceeding related fleet requirements, acquiring vehicles to support these strategies while minimizing fleet size and vehicle miles traveled, and refining strategies based on agency performance.
  5. Hydrogen chemisorption on diamond surfaces. Final report

    Previously we demonstrated the ability to measure submonolayer quantities of surface hydrogen on insulating glasses. The present study builds on this by examining hydrogen coverages on another insulating material: the technologically important diamond (100) surface. The information to be obtained in the present study will allow us to deduce the correct structures for the diamond (100)-(1X1) and -(2X1) surface phases and provide information on the kinetics of hydrogen desorption from the (100) surface. Such experiments are essential for a complete understanding of hydrogen surface chemistry during the chemical vapor deposition of thin diamond films. This report summarizes progress made inmore » FY93 for measuring surface hydrogen concentrations on the diamond (100) surface. Although the available LDRD resources were insufficient to finish this study in FY93, completion of the study is planned using other resources and this detailed report as a reference.« less
  6. Spectral characteristics of Kalman filter systems for atmospheric data assimilation

    In recent years, there has been increasing interest in the application of Kalman filter systems to atmospheric data assimilation. One important aspect of any data assimilation system is its filtering properties. This is examined by spectral decomposition of a simple one-dimensional Kalman filter system. It is shown that the second-moment error statistics of constant-coefficient linear systems observed everywhere on a regular grid are reduced to scalar systems by Fourier transforms. Under these conditions, the complete space and time behavior of the forecast and analysis error covariances can be explicitly determined from the model and observation error covariances and the initialmore » forecast error covariance. The resulting solutions can then be examined by elementary dynamic systems analysis. The multivariate, inviscid, dissipative, unstable mode and nonstochastic cases are analyzed. The stationary solutions and the rate of convergence toward them are found and certain unstable, periodic, and quasi-periodic solutions are discussed. It is shown that the perfect, inviscid system converges to the stationary solution very slowly, but that viscosity improves the convergence rate. Wind insertion also improves the convergence rate, but the wind only case is unstable. A simple method of determining model error statistics from forecast error statistics is discussed. 13 refs., 9 figs.« less

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"Daley, R."

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