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  • Informa UK Limited
  • American Association for the Advancement of Science (AAAS)
  • American Institute of Physics (AIP)
  • Amsterdam : Elsevier
  • 2010-2014  (5)
  • 1
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    Research Update: A hafnium-based metal-organic framework as a catalyst for regioselective ring-opening of epoxides with a mild hydride source (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-10-28
    Description: Reaction of styrene oxide with sodium cyanoborohydride and a catalytic amount of Hf-NU-1000 yields the anti-Markovnikov product, 2-phenylethanol, with over 98% regioselectivity. On the other hand, propylene oxide is ring opened in a Markovnikov fashion to form 2-propanol with 95% regioselectivity. Both styrene oxide and propylene oxide failed to react with sodium cyanoborohydride without the addition of Hf-NU-1000 indicative of the crucial role of Hf-NU-1000 as a catalyst in this reaction. To the best of our knowledge, this is the first report of the use of a metal-organic framework material as a catalyst for ring-opening of epoxides with hydrides.
    Electronic ISSN: 2166-532X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by American Institute of Physics (AIP)
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  • 2
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    Comment on "Changes in climatic water balance drive downhill shifts in plant species' optimum elevations" (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-10-15
    Description: Crimmins et al. (Reports, 21 January 2011, p. 324) attributed an apparent downward elevational shift of California plant species to a precipitation-induced decline in climatic water deficit. We show that the authors miscalculated deficit, that the apparent decline in species' elevations is likely a consequence of geographic biases, and that unlike temperature changes, precipitation changes should not be expected to cause coordinated directional shifts in species' elevations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stephenson, Nathan L -- Das, Adrian J -- New York, N.Y. -- Science. 2011 Oct 14;334(6053):177; author reply 177. doi: 10.1126/science.1205740.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉US Geological Survey, Western Ecological Research Center, Three Rivers, CA 93271, USA. nstephenson@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21998371" target="_blank"〉PubMed〈/a〉
    Keywords: *Altitude ; *Climate Change ; *Ecosystem ; *Plants ; *Water
    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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    Small-scale mantle convection produces stratigraphic sequences in sedimentary basins (2010)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2010-08-14
    Description: Cyclic sedimentary deposits link stratigraphic sequences that are now geographically distant but were once part of the same depositional environment. Some of these sequences occur at periods of 2 to 20 million years, and eustatic sea-level variations or regional tectonic events are likely causes of their formation. Using numerical modeling, we demonstrate that small-scale mantle convection can also cause the development of stratigraphic sequences through recurrent local and regional vertical surface movements. Small-scale convection-driven stratigraphic sequences occur at periods of 2 to 20 million years and correlate only at distances up to a few hundred kilometers. These results suggest that previous sequence stratigraphic analyses may contain erroneous conclusions regarding eustatic sea-level variations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petersen, K D -- Nielsen, S B -- Clausen, O R -- Stephenson, R -- Gerya, T -- New York, N.Y. -- Science. 2010 Aug 13;329(5993):827-30. doi: 10.1126/science.1190115.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Science, Aarhus University, DK-8000 Aarhus C, Denmark. kenni@geo.au.dk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20705857" target="_blank"〉PubMed〈/a〉
    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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  • 4
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    Advanced photon source upgrade benefits all (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-05-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stephenson, Brian -- New York, N.Y. -- Science. 2014 May 2;344(6183):470. doi: 10.1126/science.344.6183.470-a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Director, Advanced Photon Source, Associate Laboratory Director for Photon Sciences, Argonne National Laboratory, Argonne, IL 60439, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24786062" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Real-time x-ray studies of crystal growth modes during metal-organic vapor phase epitaxy of GaN on c- and m-plane single crystals (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-05
    Description: Non-polar orientations of III-nitride semiconductors have attracted significant interest due to their potential application in optoelectronic devices with enhanced efficiency. Using in situ surface x-ray scattering during metal-organic vapor phase epitaxy (MOVPE) of GaN on non-polar (m-plane) and polar (c-plane) orientations of single crystal substrates, we have observed the homoepitaxial growth modes as a function of temperature and growth rate. On the m-plane surface, we observe all three growth modes (step-flow, layer-by-layer, and three-dimensional) as conditions are varied. In contrast, the +c-plane surface exhibits a direct crossover between step-flow and 3D growth, with no layer-by-layer regime. The apparent activation energy of 2.8 ± 0.2 eV observed for the growth rate at the layer-by-layer to step-flow boundary on the m-plane surface is consistent with those observed for MOVPE growth of other III-V compounds, indicating a large critical nucleus size for islands.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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