The authors present a procedure for resource allocation among transit agencies for transit fleet management, specifically focusing on the purchase of new buses and rebuilding of existing buses. The model is formulated as a non-linear optimization problem of maximizing the total weighted average remaining life of the fleet subject to budgetary, policy and other constraints. The problem is solved...

Qimin Yan,1,2 Emmanouil Kioupakis,1,3 Debdeep Jena,4 and Chris G. Van de Walle1 1Materials Department, University of California, Santa Barbara, California 93106-5050, USA 2Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 3Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA 4Department of Electrical Engi...

C. J. Dorow,1 M. W. Hasling,1 E. V. Calman,1 L. V. Butov,1 J. Wilkes,2 K. L. Campman,3 and A. C. Gossard3 1Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA 2School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA Wales, United Kingdom 3Materials Department, University of California at Santa Barbara, Santa Barbara, California 93106...

A. Schleife,1,2,3 J. B. Varley,3 F. Fuchs,1,2 C. Rödl,1,2 F. Bechstedt,1,2 P. Rinke,2,4 A. Janotti,4 and C. G. Van de Walle4 1Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, D-07743 Jena, Germany 2European Theoretical Spectroscopy Facility (ETSF) 3Department of Physics, University of California, Santa Barbara, California 93106-9530, USA 4Materials De...

IMPORTANCE Surveyed physicians tend to place responsibility for high medical costs more on "demanding patients" than themselves. However, there are few data about the frequency of demanding patients, clinical appropriateness of their demands, and clinicians' compliance with them. OBJECTIVE To assess how frequently patients demand or request medical tests or treatments, what types they demand,...

We have obtained high-resolution images of two carbon-rich objects that are undergoing the transition from post-AGB star to planetary nebula: IRAS 21282+5050 (hereafter IRAS 21282), a young planetary nebula, and AFGL 3068, a post-AGB star with a high mass-loss rate. Detailed structure is seen in IRAS 21282. A torus of dust, with its polar axis in the N-S direction, surrounds the central star, i...

Almerima Jamakovic, Priya Mahadevan, Amin Vahdat, Marián Boguñá, and Dmitri Krioukov TNO Information and Communication Technology, Netherlands Organisation for Applied Scientific Research, P.O. Box 5050, 2600 GB Delft, The Netherlands HP Labs, 1501 Page Mill Rd, Palo Alto, California, 94304, USA Department of Computer Science and Engineering, University of California, San Diego (UCSD), 9500 Gil...

We present observations taken with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO) of three evolved C-rich stars, the post-AGB star HR 4049 and two planetary nebulae, IRAS21282+5050 and NGC 7027. The spectra are dominated by the well-known infrared emission bands, attributed to Polycyclic Aromatic Hydrocarbons (PAHs). The SWS spectra for the first time allo...