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  • 1
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    Comment on "Carbon-negative biofuels from low-input high-diversity grassland biomass" (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-06-16
    Description: Tilman et al. (Reports, 8 December 2006, p. 1598) argued that low-input high-diversity grasslands can provide a substantial proportion of global energy needs. We contend that their conclusions are not substantiated by their experimental protocol. The authors understated the management inputs required to establish prairies, extrapolated globally from site-specific results, and presented potentially misleading energy accounting.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russelle, Michael P -- Morey, R Vance -- Baker, John M -- Porter, Paul M -- Jung, Hans-Joachim G -- New York, N.Y. -- Science. 2007 Jun 15;316(5831):1567; author reply 1567.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Department of Agriculture, Agricultural Research Service, St. Paul, MN 55108, USA. michael.russelle@ars.usda.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17569846" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; *Biomass ; *Carbon/analysis ; Climate ; Ecosystem ; *Energy-Generating Resources ; Fabaceae/growth & development/metabolism ; Plant Development ; *Plants/metabolism ; *Poaceae/growth & development/metabolism ; Soil
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Biofuels: putting current practices in perspective (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-06-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Porter, John R -- Chirinda, Ngonidzashe -- Felby, Claus -- Olesen, Jorgen E -- New York, N.Y. -- Science. 2008 Jun 13;320(5882):1421-2; author reply 1421-2. doi: 10.1126/science.320.5882.1421.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18556534" target="_blank"〉PubMed〈/a〉
    Keywords: *Biomass ; Crops, Agricultural ; Ecosystem ; *Energy-Generating Resources ; Plant Development ; *Plants
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    QBO as Potential Amplifier of Solar Cycle Influence (2006)
    In:  Other Sources
    Details
    Publication Date: 2018-06-06
    Description: The solar cycle (SC) effect in the lower atmosphere has been linked observationally to the quasi-biennial oscillation (QBO) of the zonal circulation. Salby and Callaghan (2000) in particular analyzed the QBO covering more than 40 years and found that it contains a large SC signature at 20 km. We discuss a 3D study in which we simulate the QBO under the influence of the SC. For a SC period of 10 years, the relative amplitude of radiative forcing is taken to vary with height: 0.2% (surface), 2% (50 km), 20% (100 km and above). This model produces in the lower stratosphere a relatively large modulation of the QBO, which appears to come from the SC and qualitatively agrees with the observations. The modulation of the QBO, with constant phase relative to the SC, is shown to persist at least for 50 years, and it is induced by a SC modulated annual oscillation that is hemispherically symmetric and confined to low latitudes.
    Keywords: Solar Physics
    Type: Geophysical Research Letters; Volume 33
    Format: text
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  • 4
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    The Solar Ultraviolet Magnetograph Investigation: Polarization Properties (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: This paper will describe the objectives of the Marshall Space Flight Center (MSFC) Solar Ultraviolet Magnetograph Investigation (SUMI) and the optical components that have been developed to meet those objectives. A sounding rocket payload is being developed to test the feasibility of magnetic field measurements in the Sun s transition region. This paper will review the scientific measurements that will be made by the SUMI sounding rocket program, and the optics have been optimized for simultaneous measurements of two magnetic lines formed in the transition region (CIV at 1550 A and MgII at 2800 A). Finally, this paper will concentrate on the polarization properties of the SUM1 polarimeter and toroidal varied-line-space gratings.
    Keywords: Solar Physics
    Type: SPIE Optics and Photonics; Jul 31, 2005 - Aug 04, 2005; San Diego, CA; United States
    Format: text
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  • 5
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    The Sheath Transport Observer for the Redistribution of Mass (STORM) Image (2008)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: All of the solar wind energy that powers magnetospheric processes passes through the magnetosheath and magnetopause. Global images of the magnetosheath and magnetopause boundary layers will resolve longstanding controversy surrounding fundamental phenomena that occur at the magnetopause and provide information needed to improve operational space weather models. Recent developments showing that soft X-rays (0.15-1 keV) result from high charge state solar wind ions undergoing charge exchange recombination through collisions with exospheric neutral atoms has led to the realization that soft X-ray imaging can provide global maps of the high-density shocked solar wind within the magnetosheath and cusps, regions lying between the lower density solar wind and magnetosphere. We discuss an instrument concept called the Sheath Transport Observer for the Redistribution of Mass (STORM), an X-ray imager suitable for simultaneously imaging the dayside magnetosheath, the magnetopause boundary layers, and the cusps.
    Keywords: Solar Physics
    Type: American Geophysical Union Conference; Dec 11, 2008 - Dec 20, 2008; San Francisco, CA; United States
    Format: text
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