Lauren A. Hails  Jodie C. Babister  Stefanie Inglis  Sean A. Davis  Richard O. C. Oreffo  Stephen Mann 《Small (Weinheim an der Bergstrasse, Germany)》2010,6(18):1986-1991

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Daniel J. Solis  Sean R. Coyer  Andrés J. García  Emmanuel Delamarche 《Advanced materials (Deerfield Beach, Fla.)》2010,22(1):111-114

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Michael Tsang  Cate Fox‐Lent  Sean Wallace  Tim Welp  Matthew Bates  Igor Linkov 《Biofuels, Bioproducts and Biorefining》2015,9(5):567-580

The push to find alternatives to fossil fuels has driven research and consumption of biofuels. Recent actions in the United States have placed an emphasis on the use of renewable fuels for improved sustainability of government operations. In 2013, the United States Army Corps of Engineers (USACE) measured atmospheric emissions from two navigation vessels consuming three different fuel types and found that biofuels have the potential to lower atmospheric emissions. These fuels have widely different production processes, however, and a full life‐cycle assessment is necessary to provide a complete picture of these biofuels. The goal of this study was to identify whether transitioning navigation vessels to operate on biodiesel would have the potential to lower human health and environmental impacts. This study focuses on the complete life cycle of these fuels in USACE marine vessels by employing a well‐to‐wheels life‐cycle assessment comparing the impacts of a 100% soy‐based biodiesel and an algal‐based biodiesel blend to a conventional diesel. Overall, soybean‐based biodiesel had lower impacts compared to algal‐based biodiesel. Impacts from conventional diesel were generally lower than algal‐based biodiesel, but impacts between conventional diesel and soybean‐based biodiesel were mixed. While greenhouse gas emissions during the use phase were reduced for the biofuels (after considering only the non‐biogenic fraction of carbon emission), a complete look at the life‐cycle resulted in cases where emissions could be greater than conventional diesel. Biodiesel impacts depended greatly on modeling assumptions made in the life‐cycle system boundaries and inventory such as allocation method and assumptions about feedstock growth and harvesting. Published 2015. This article is a U.S. Government work and is in the public domain in the USA.  相似文献   

    

Riso  Lawrence P.; du Toit  P. L.; Blandino  Jaime A.; Penna  Suzanne; Dacey  Sean; Duin  Jason S.; Pacoe  Elizabeth M.; Grant  Merida M.; Ulmer  Christi S. 《Canadian Metallurgical Quarterly》2003,112(1):72

Previous research on chronic depression has focused on its link with other mood disorders and Axis II personality disorders. However, there are few data examining whether the cognitive perspective applies to this condition. In this cross-sectional study, 42 outpatients with chronic depression were compared with 27 outpatients with nonchronic major depressive disorder and 24 never psychiatrically ill controls on cognitive variables thought to be related to vulnerability to depression (e.g., dysfunctional attitudes, attributional style, a ruminative response style, and maladaptive core beliefs). Both depressed groups were more elevated than a never-ill comparison group. However, chronically depressed individuals were generally more elevated on measures of cognitive variables than those with major depressive disorders even after controlling for mood state and personality disorder symptoms. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

    

Perkin KK  Bromley KM  Davis SA  Hirsch A  Böttcher C  Mann S 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(12):2057-2060

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Daniel J. Solis  Sean R. Coyer  Andrés J. García  Emmanuel Delamarche 《Advanced materials (Deerfield Beach, Fla.)》2010,22(1)

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Xiaosong Tang  Sean J. O’Shea  Ivan U. Vakarelski 《Advanced materials (Deerfield Beach, Fla.)》2010,22(45):5150-5153

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Rajiv Saran  Vijaya Venkataraman  Sean F. Leavey  Ron Usovsky  Kumari Usha  Zbylut J. Twardowski 《Hemodialysis international. International Symposium on Home Hemodialysis》2000,4(1):32-36

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Antonio Alberto Lopes  Sean F Leavey  Keith McCullough  Brenda Gillespie  Juergen Bommer  Bernard J Canaud  Akira Saito  Shunichi Fukuhara  Philip J Held  Friedrich K Port  Eric W Young 《Hemodialysis international. International Symposium on Home Hemodialysis》2004,8(3):287-294

Background: Rising hospital care costs have created pressure to shorten hospital stays and emphasize outpatient care. This study tests the hypothesis that shorter median length of stay (LOS) as a dialysis facility practice is associated with higher rates of early readmission. Methods: Readmission within 30 days of each hospitalization was evaluated for participants in the Dialysis Outcomes and Practice Patterns Study, an observational study of randomly selected hemodialysis patients in the United States (142 facilities, 5095 patients with hospitalizations), five European countries (101 facilities, 2281 patients with hospitalizations), and Japan (58 facilities, 883 patients with hospitalizations). Associations between median facility LOS (estimated from all hospitalizations at the facility and interpreted as a dialysis facility practice pattern) and odds of readmission were assessed using logistic regression, adjusted for patient characteristics and the LOS of each index hospitalization. Results: Risk of readmission was directly and significantly associated with LOS of the index hospitalization (adjusted odds ratio [AOR] 1.005 per day in median facility LOS, p = 0.007) and inversely associated with median facility LOS (AOR = 0.974 per day, p = 0.016). This latter association was strongest for US hemodialysis centers (AOR = 0.954 per day, p = 0.015). Conclusions: Dialysis facilities with shorter median hospital LOS for their patients have higher odds of readmission, particularly in the United States, where there is greater pressure to shorten LOS. The determinants and consequences of practices related to hospital LOS for hemodialysis patients should be further studied.  相似文献   

    

Sean K. Lehman 《International journal of imaging systems and technology》2002,12(1):16-26

We consider the problem of noninvasively locating objects buried in a layered medium such as land mines in the ground or objects concealed in a wall. In such environments, the transmitter(s) and receiver(s) are frequently within the near‐field region of the illuminating radiation. In these cases, the scattered evanescent field carries useful information on the scattering object. Conventional diffraction tomography techniques neglect, by their design, the evanescent field. Under near‐field conditions, they treat it as noise as opposed to valid data. If correctly incorporated into a reconstruction algorithm, the evanescent field, which carries high spatial frequency information, can be used to achieve resolution beyond the classical limit of λ/2, or “superresolution.” We build on the generalized holography theory presented by Langenberg to develop a planar diffraction tomography algorithm that incorporates evanescent field information to achieve superresolution. Our theory is based on a generalization of the Fourier transform, which allows for complex spatial frequencies in a manner similar to the Laplace transform. We specialize our model to the case of a two‐dimensional multimonostatic, wideband imaging system, and derive an extended resolution reconstruction procedure. We implement and apply our reconstruction to two data sets collected using the Lawrence Livermore National Laboratory (LLNL) Micropower Impulse Radar (MIR). © 2002 John Wiley & Sons, Inc. Int J Imaging Syst Technol 12, 16–26, 2002  相似文献