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  • 1
    Publication Date: 2015-09-22
    Description: Fabrication and optical characterization of surfaces covered with open-ended metallic waveguides are presented along with numerical modeling of these structures. Both modeling and measurement of the structures indicate that the 2-D array of 3D metallic waveguides modify both the direction and spectral content of the emissivity, resulting in directionality normal to the surface due to the optical axis of the waveguides and spectrally narrow emissivity due to the lateral dimensions of the waveguides. Furthermore, the optical behavior of these structures is placed in the broader context of other structured emission/absorption surfaces such as organ pipe modes, surface plasmon modes, and coherent thermal emission from gratings.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 2
    Publication Date: 2016-04-06
    Description: A method for patterning on vertical silicon surfaces in high aspect ratio silicon topography is presented. A Faraday cage is used to direct energetic reactive ions obliquely through a patterned suspended membrane positioned over the topography. The technique is capable of forming high-fidelity pattern (100 nm) features, adding an additional fabrication capability to standard top-down fabrication approaches.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 3
    Publication Date: 2011-01-29
    Description: Understanding ancient climate changes is hampered by the inability to disentangle trends in ocean temperature from trends in continental ice volume. We used carbonate "clumped" isotope paleothermometry to constrain ocean temperatures, and thereby estimate ice volumes, through the Late Ordovician-Early Silurian glaciation. We find tropical ocean temperatures of 32 degrees to 37 degrees C except for short-lived cooling by ~5 degrees C during the final Ordovician stage. Evidence for ice sheets spans much of the study interval, but the cooling pulse coincided with a glacial maximum during which ice volumes likely equaled or exceeded those of the last (Pleistocene) glacial maximum. This cooling also coincided with a large perturbation of the carbon cycle and the Late Ordovician mass extinction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finnegan, Seth -- Bergmann, Kristin -- Eiler, John M -- Jones, David S -- Fike, David A -- Eisenman, Ian -- Hughes, Nigel C -- Tripati, Aradhna K -- Fischer, Woodward W -- New York, N.Y. -- Science. 2011 Feb 18;331(6019):903-6. doi: 10.1126/science.1200803. Epub 2011 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. sethf@caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21273448" 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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  • 4
    Publication Date: 2014-01-17
    Description: Measured rates of river incision into bedrock are commonly interpreted as proxies for rates of rock uplift (see refs 1 and 2, for example) and indices of the strength of climatic forcing of erosion over time (see refs 3 and 4, for example). This approach implicitly assumes that river incision rates are in equilibrium with external forcings over a wide range of timescales. Here we directly test this assumption by examining the temporal scaling of bedrock river incision from 155 independent measurements of river incision compiled from 14 sites. Of these sites, 11 exhibit a negative power-law dependence of bedrock river incision rate on measurement interval, a relationship that is apparent over timescales of 10(4)-10(7) years and is independent of tectonic and geomorphic setting. Thus, like rates of sediment accumulation, rates of river incision into bedrock exhibit non-steady-state behaviour even over very long measurement intervals. Non-steady-state behaviour can be explained by episodic hiatuses in river incision triggered by alluvial deposition, if such hiatuses have a heavy-tailed length distribution. Regardless of its cause, the dependence of incision rate on measurement interval complicates efforts to infer tectonic or climatic forcing from changes in rates of river incision over time or from comparison of rates computed over different timescales.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finnegan, Noah J -- Schumer, Rina -- Finnegan, Seth -- England -- Nature. 2014 Jan 16;505(7483):391-4. doi: 10.1038/nature12913.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, California 95064, USA. ; Division of Hydrologic Sciences, Desert Research Institute, Reno, Nevada 89512, USA. ; Department of Integrative Biology, University of California Berkeley, Berkeley, California 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24429636" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2013-08-03
    Description: Biotic interactions drive key ecological and evolutionary processes and mediate ecosystem responses to climate change. The direction, frequency, and intensity of biotic interactions can in turn be altered by climate change. Understanding the complex interplay between climate and biotic interactions is thus essential for fully anticipating how ecosystems will respond to the fast rates of current warming, which are unprecedented since the end of the last glacial period. We highlight episodes of climate change that have disrupted ecosystems and trophic interactions over time scales ranging from years to millennia by changing species' relative abundances and geographic ranges, causing extinctions, and creating transient and novel communities dominated by generalist species and interactions. These patterns emerge repeatedly across disparate temporal and spatial scales, suggesting the possibility of similar underlying processes. Based on these findings, we identify knowledge gaps and fruitful areas for research that will further our understanding of the effects of climate change on ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blois, Jessica L -- Zarnetske, Phoebe L -- Fitzpatrick, Matthew C -- Finnegan, Seth -- New York, N.Y. -- Science. 2013 Aug 2;341(6145):499-504. doi: 10.1126/science.1237184.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Natural Sciences, University of California, Merced, Merced, CA 95343, USA. jblois@ucmerced.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23908227" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; *Climate Change ; *Ecosystem ; *Extinction, Biological ; Forecasting ; Fossils ; Invertebrates ; Plants
    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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  • 6
    Publication Date: 2015-05-02
    Description: Marine taxa are threatened by anthropogenic impacts, but knowledge of their extinction vulnerabilities is limited. The fossil record provides rich information on past extinctions that can help predict biotic responses. We show that over 23 million years, taxonomic membership and geographic range size consistently explain a large proportion of extinction risk variation in six major taxonomic groups. We assess intrinsic risk-extinction risk predicted by paleontologically calibrated models-for modern genera in these groups. Mapping the geographic distribution of these genera identifies coastal biogeographic provinces where fauna with high intrinsic risk are strongly affected by human activity or climate change. Such regions are disproportionately in the tropics, raising the possibility that these ecosystems may be particularly vulnerable to future extinctions. Intrinsic risk provides a prehuman baseline for considering current threats to marine biodiversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finnegan, Seth -- Anderson, Sean C -- Harnik, Paul G -- Simpson, Carl -- Tittensor, Derek P -- Byrnes, Jarrett E -- Finkel, Zoe V -- Lindberg, David R -- Liow, Lee Hsiang -- Lockwood, Rowan -- Lotze, Heike K -- McClain, Craig R -- McGuire, Jenny L -- O'Dea, Aaron -- Pandolfi, John M -- New York, N.Y. -- Science. 2015 May 1;348(6234):567-70. doi: 10.1126/science.aaa6635.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Integrative Biology, University of California, Berkeley, CA 94720, USA. sethf@berkeley.edu. ; Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada. ; Department of Earth and Environment, Franklin and Marshall College, Lancaster, PA 17604, USA. ; Department of Paleobiology, National Museum of Natural History, Washington, DC 20013, USA. ; United Nations Environment Programme World Conservation Monitoring Centre, Cambridge CB3 0DL, UK. Computational Science Laboratory, Microsoft Research, Cambridge CB1 2FB, UK. Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada. ; Department of Biology, University of Massachusetts, Boston, MA 02125, USA. ; Environmental Science Program, Mount Allison University, Sackville, New Brunswick E4L 1A5, Canada. ; Department of Integrative Biology, University of California, Berkeley, CA 94720, USA. ; Center for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, Blindern, N-0316 Oslo, Norway. ; Department of Geology, College of William and Mary, Williamsburg, VA 23187, USA. ; Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada. ; National Evolutionary Synthesis Center, Durham, NC 27705, USA. ; School of Environmental and Forest Sciences, University of Washington, Seattle, WA 98195, USA. ; Smithsonian Tropical Research Institute, 0843-03092, Balboa, Republic of Panama. ; Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, University of Queensland, St. Lucia, QLD 4072, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25931558" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Aquatic Organisms ; *Biodiversity ; *Climate Change ; *Extinction, Biological ; Fossils ; *Human Activities ; Humans ; *Oceans and Seas ; Paleontology ; Risk
    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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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 1699-1705 
    ISSN: 1572-8943
    Keywords: metal/halogen compounds ; pyrotechnics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Fluorine and its derivatives have been used as a substitute to oxygen-containing oxidizers in higher performing propellants and other energetic materials. They typically react rapidly with metals or thin oxide layers of the metals to produce metal fluorides, generally in the gaseous state. Thermal reactions of stoichiometric mixtures of metal (M=Al, Ti) -F containing polymers have been studied using thermal analyzers and their energetics are compared with the metals in other halogen element containing oxidizers. The experimental results indicated that thermal reaction becomes more exothermic as the bond strength between Al-X (X=F, Br, I) becomes stronger. It was also found that oxidation of metal powders is largely affected by the size of metal powders as well as the nature of existing oxide layer.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 707-717 
    ISSN: 1572-8943
    Keywords: autoignition ; pyrotechnic mixtures ; shock initiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal behavior of metal, oxide, and oxidizer mixtures, some with fluorine compound additions, has been studied in order to examine the influence of thermal properties on the initiation conditions for chemical reaction of pyrotechnic powders under dynamic loading conditions. The autoignition energies of the mixtures obtained from thermal analyses were compared with shock initiation energies, determined from planar shock measurements. Although some mixtures showed an approximate equivalency between the energies obtained from the two different experiments, the experimental results indicated that any comparison should be made with great care.
    Type of Medium: Electronic Resource
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  • 9
  • 10
    Publication Date: 2007-06-11
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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