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Berlin Brandenburg

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  • 1
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 13 October 2015, Vol.112(41), pp.12604-9
    Description: Eccentricity, obliquity, and precession are cyclic parameters of the Earth's orbit whose climatic implications have been widely demonstrated on recent and short time intervals. Amplitude modulations of these parameters on million-year time scales induce "grand orbital cycles," but the behavior and the paleoenvironmental consequences of these cycles remain debated for the Mesozoic owing to the chaotic diffusion of the solar system in the past. Here, we test for these cycles from the Jurassic to the Early Cretaceous by analyzing new stable isotope datasets reflecting fluctuations in the carbon cycle and seawater temperatures. Our results document a prominent cyclicity of ∼9 My in the carbon cycle paced by changes in the seasonal dynamics of hydrological processes and long-term sea level fluctuations. These paleoenvironmental changes are linked to a great eccentricity cycle consistent with astronomical solutions. The orbital forcing signal was mainly amplified by cumulative sequestration of organic matter in the boreal wetlands under greenhouse conditions. Finally, we show that the ∼9-My cycle faded during the Pliensbachian, which could either reflect major paleoenvironmental disturbances or a chaotic transition affecting this cycle.
    Keywords: Mesozoic ; Carbon Cycle ; Eustatism ; Orbital Cycles ; Paleoclimate
    ISSN: 00278424
    E-ISSN: 1091-6490
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  • 2
    Language: English
    In: Nature, Sept 23, 2010, Vol.467(7314), p.412(2)
    Keywords: Molecular Dynamics -- Research ; Nuclear Excitation -- Research
    ISSN: 0028-0836
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  • 3
    Language: English
    Description: Martínez Abietar, AJ. (2018). Polarimetry enabled by nanophotonics. Science. 362(6416):750-751. https://doi.org/10.1126/science.aau7494
    Keywords: Polarimetry ; Nanophotonics ; Teoria De La Señal Y Comunicaciones
    ISSN: 0036-8075
    E-ISSN: 10959203
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  • 4
    Article
    Article
    In: Nature, 2015, Vol.527(7578), p.404
    ISSN: 0028-0836
    Source: Nature Publishing Group
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  • 5
    Language: English
    In: Journal of Adolescent & Adult Literacy, November 2011, Vol.55(3), p.221
    Description: Students from low-socioeconomic areas participated in this multiple-case study, which sought to unveil how they succeeded in developing literacy skills and academic success along with recommendations they had for future students. The students in this study received a full college scholarship...
    Keywords: Academic Achievement ; Essays ; Literacy ; Scholarships ; Personal Narratives ; Reading Skills ; Success ; Low Income Groups ; College Bound Students ; College Graduates ; Interviews ; Surveys ; Student Characteristics ; At Risk Students ; United States ; Education
    ISSN: 1081-3004
    E-ISSN: 1936-2706
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  • 6
    Language: English
    In: Science (New York, N.Y.), 27 May 2016, Vol.352(6289), pp.1050-1
    Description: Biomass-degrading microorganisms use lytic polysaccharide monooxygenase (LPMO) enzymes to help digest cellulose, chitin, and starch. By cleaving otherwise inaccessible crystalline cellulose chains, these enzymes provide access to hydrolytic enzymes. LPMOs are of interest to biotechnology because efficient depolymerization of cellulose is a major bottleneck for the production of biologically based chemicals and fuels. On page 1098 of this issue, Kracher et al. ( 1 ) compare LPMO-reducing substrates in fungi from different taxonomic groups and lifestyles, based on both biochemical and genomic evidence. The results provide insights into reductive activation of LPMO that are important for developing more efficient industrial enzymes for lignocellulose biorefineries.
    Keywords: Fungal Proteins -- Chemistry ; Fungi -- Enzymology ; Lignin -- Chemistry ; Mixed Function Oxygenases -- Chemistry
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 7
    Language: English
    In: Journal of Applied Physics, April 1, 2012, Vol.111(7), p.07D103-1-07D103-3
    Description: Several micromagnetic simulations are carried out for examining the magnetization dynamics exhibited by the thin ferromagnet ring driven by the Oersted field created by injecting a current along an infinite conductive wire. The study is shown to be extremely beneficial for the design of memory devices- based thin ferromagnetic rings.
    Keywords: Atomic Force Microscopy -- Technology Application ; Ferromagnetic Materials -- Usage ; Mram (Computer memory) -- Design And Construction ; Magnetization -- Analysis
    ISSN: 0021-8979
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Journal of Applied Physics, 01 February 2012, Vol.111(3)
    Description: The current-driven domain wall propagation along a thin ferromagnetic strip with high perpendicular magnetocrystalline anisotropy is studied by means of micromagnetic simulations with emphasis on the role of the Rashba field, which has been predicted to play a dominant role in multilayer stacks with structure inversion asymmetry. Taking into account the surface roughness and thermal fluctuations, the results show a current dependence of the domain wall velocity in good qualitative agreement with recent experimental observations. It depicts (i) a low-current creep regime, where the domain wall velocity increases exponentially and (ii) a high-current linear regime where the wall propagates rigidly with a higher mobility than the one expected in the turbulent Walker regime. The analysis seems to be essential in order to get a better understanding of the magnitude of the non-adiabatic torque by direct comparison with experimental measurements.
    Keywords: Articles
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 9
    Language: English
    In: Proceedings Of The 55th Annual Conference On Magnetism And Magnetic Materials, Atlanta, Georgia (14-18 November 2010):
    In: Journal of Applied Physics, 01 April 2012, Vol.111(7)
    Description: A micromagnetic study is carried out to analyze the influence of the spin-orbit Rashba field on the current-driven domain wall dynamics along a ferromagnetic strip with high perpendicular magnetocrystalline anisotropy, taking into account both surface roughness and thermal effects. Similarly to the creep and flow regimes seen in recent experiments, the domain wall velocity increases exponentially and linearly for low and high currents, respectively. The induced transverse Rashba field stabilizes the Bloch structure, extending the rigid mobility regime toward high currents and allowing higher velocities than in single-layer or symmetric stacks with negligible Rashba field.
    Keywords: Proceedings Of The 56th Annual Conference On Magnetism And Magnetic Materials
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 10
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 11 December 2018, Vol.115(50), pp.12624-12629
    Description: A better understanding of how developments in science and technology influence the creation of new occupations and subsequent changes in educational programs can help decision makers at all levels of our society. As a result of research and development efforts, innovations are achieved, resulting in the creation of new occupations and the demand for employees with expertise in these new areas. To fulfill the demand, universities and colleges often revise their programs to address these needs. Several data sources are described in this paper that might help us to explore the relationship between advancements in industry, emerging occupations, and educational changes over time.
    Keywords: R&D Funding ; Emerging Occupations ; Job Analysis ; Population Projections
    ISSN: 00278424
    E-ISSN: 1091-6490
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