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  • 1
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    Measurement of the parameter ξ^{′′} in polarized muon decay and implications on exotic couplings of the leptonic weak interaction (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-12-04
    Description: Author(s): R. Prieels, O. Naviliat-Cuncic, P. Knowles, P. Van Hove, X. Morelle, J. Egger, J. Deutsch, J. Govaerts, W. Fetscher, K. Kirch, and J. Lang The muon decay parameter ξ ′′ has been determined in a measurement of the longitudinal polarization of positrons emitted from polarized and depolarized muons. The result, ξ ′′ =0.981±0.045 stat ±0.003 syst , is consistent with the Standard Model prediction of unity, and provides an order of magnitude impro... [Phys. Rev. D 90, 112003] Published Wed Dec 03, 2014
    Keywords: Particle Experiment
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Thermodynamic Model for Uranium Release from Hanford Site Tank Residual Waste (2011)
    American Chemical Society (ACS)
    Details
    Publication Date: 2011-01-28
    Description: Environmental Science & Technology DOI: 10.1021/es1038968
    Print ISSN: 0013-936X
    Electronic ISSN: 1520-5851
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by American Chemical Society (ACS)
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  • 3
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    Road will ruin Serengeti (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-09-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dobson, Andrew P -- Borner, Markus -- Sinclair, Anthony R E -- Hudson, Peter J -- Anderson, T Michael -- Bigurube, Gerald -- Davenport, Tim B B -- Deutsch, James -- Durant, Sarah M -- Estes, Richard D -- Estes, Anna B -- Fryxell, John -- Foley, Charles -- Gadd, Michelle E -- Haydon, Dan -- Holdo, Ricardo -- Holt, Robert D -- Hopcraft, J Grant C -- Hilborn, Ray -- Jambiya, George L K -- Laurenson, M Karen -- Melamari, Lota -- Morindat, Alais Ole -- Ogutu, Joseph O -- Schaller, George -- Wolanski, Eric -- England -- Nature. 2010 Sep 16;467(7313):272-3. doi: 10.1038/467272a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology at Princeton University, New Jersey 08544, USA. dobson@Princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20844519" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Migration ; Animals ; Biodiversity ; Conservation of Natural Resources/*methods ; *Ecosystem ; Environmental Pollution/prevention & control ; *Federal Government ; Food Chain ; Models, Economic ; Politics ; Risk Assessment ; Ruminants/physiology ; Tanzania ; Transportation/*instrumentation ; *Urbanization
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Improved geostatistical models of inclined heterolithic strata for McMurray Formation, Alberta, Canada (2013)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2013-07-03
    Description: The McMurray Formation of northern Alberta in Canada contains multiscale complex geologic features that were partially formed in a fluvial-estuarine depositional environment. The inclined heterolithic strata deposited as part of fluvial point bars contain continuous centimeter-scale features that are important for flow characterization of steam-assisted gravity drainage processes. These channels are common, extensive, and imbricated over many square kilometers. Modeling the detailed facies in such depositional systems requires a methodology that reflects heterogeneity over many scales. This article presents an object-based facies modeling technique that (1) reproduces the geometry of multiscale geologic architectural elements seen in the McMurray Formation outcrops and (2) provides a grid-free framework that models these geologic objects without relating them to a grid system. The grid-free object-based modeling can be applied to any depositional environment and allows for the complete preservation of architectural information for consistent application to any gridding scheme, local grid refinements, downscaling, upscaling, drape surface, locally variable azimuths, property trend modeling, and flexible model interaction and manipulation. Features millimeters thick or kilometers in extent are represented very efficiently in the same model.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 5
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    Upscaling permeability to unstructured grids using the multipoint flux approximation (2012)
    Geological Society of London
    Details
    Publication Date: 2012-05-01
    Description: Grids used for flow simulation are often at a much coarser scale than that of grids for geological modelling due to computational demand. Unstructured grids offer increased flexibility for the flow grid design; however, solving the flow equations and upscaling from high resolution geological grids to the coarse flow grid is more complex than using coarse regular grids. The multipoint flux approximation (MPFA) is one technique applied to discretize the flow equations on unstructured grids. This paper develops an upscaling technique that uses the MPFA method to solve the flow equations on the fine- and coarse-scale grids. Unlike most cases where the fine-scale grid is regular or structured, this work utilizes a high resolution triangular grid that conforms to the coarse-scale grid. The triangular grid is generated using the coarse-scale interaction regions as constraints. Upscaling leads to transmissibility matrices of the coarse-scale interaction regions. Two different types of local boundary conditions for the MPFA upscaling approach are developed, including linear varying pressures and pressures computed by solving the flow equations around the element boundary. The method is tested using flow simulation on several cases. Results are comparable with flow using a high resolution regular grid.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 6
    Electronic Resource
    Electronic Resource
    The diffusion coefficient of a reptating polymer (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3252-3257 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of a polymer in a network of entanglements is studied. The viscosity has been examined for chains up to 50 links and is found to scale with chain length L as L3.41±0.14 in agreement with previous theoretical work, that attributes this anomalous exponent as a finite size effect because of the finite tube length. Numerical results for chains up to 100 links give that the diffusion coefficient D, scales as L−2.50±0.04. This result differs from theoretical predictions based on tube fluctuations which claim finite length effects are unimportant for diffusion and therefore imply a −2 power law dependence for D. The reason for this discrepancy is examined. Previous work used a one-dimensional rather than a three-dimensional diffusion coefficient as the starting point of analysis. By deriving the correct procedure for calculating the three-dimensional D, one sees that it has corrections to its asymptotic behavior which are quite large, of order L−1/2, rather than L−1 as was thought previously. This suggests that fluctuations in the tube length cannot provide an adequate explanation for the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456900
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  • 7
    Electronic Resource
    Electronic Resource
    Simulation of highly stretched chains using long-range Monte Carlo (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2065-2071 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The behavior of highly stretched chains is not well described by computer simulations using the usual short-range Monte Carlo algorithms. Results from these have been shown to produce unphysical slowing down due to artificial energy barriers imposed by the dynamics. Furthermore, relaxation in the absence of a field from a highly stretched state is shown to be improperly described by the usual Monte Carlo algorithms. We propose a novel model employing long-range moves that should describe the motion in such situations more correctly. We implement this model on a square lattice to study gel electrophoresis. Using a highly efficient numerical code, the time for one long-range move scales as log(N), where N is the number of monomers in the chain. This allows us to conduct simulations of DNA molecules in a regime of molecular weights much greater than previously possible. Our results are in surprisingly good agreement with previous work for short chains using more realistic dynamics, and for longer chains, interesting data is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461006
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical studies of DNA during gel electrophoresis (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2476-2485 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of a long chain macromolecule in a gel is examined using numerical and analytical approaches. In contrast with previous conjectures, it is found that the chain does not move entirely in a "tube.'' For strong fields, an instability produced by the applied field causes the chain to frequently contract on itself. This is followed by it unwinding into an extended configuration. For lower fields, portions of the chain frequently double up on themselves and move through the gel thereby violating the tube constraint. The results can be explained by breaking down the motion into various stages, each of which can be further analyzed. The results of the simulation appear in accord with experiment and provide a more realistic description of DNA motion then tube models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455990
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  • 9
    Electronic Resource
    Electronic Resource
    Explanation of anomalous mobility and birefringence measurements found in pulsed field electrophoresis (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7436-7441 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The study of DNA in a gel under the application of a time-dependent field has revealed some unexpected experimental features. These features are recovered by means of a detailed numerical simulation incorporating the many internal degrees of freedom of the DNA chain. These results can in turn be understood qualitatively by means of a model containing only four degrees of freedom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456223
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation of forces on entangled polymers due to slippage (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 7251-7255 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We consider the force on the end of a polymer chain being pulled through a network at velocity v, using computer simulations. We develop algorithms for measuring the force on the end of the chain using lattice models of polymers. Our algorithm attaches a spring to the end being pulled and uses its average extension to calculate the force. General problems associated with the use of lattice models in obtaining forces are discussed. Variants of this method are used to obtain upper and lower bounds to the force. The results obtained are in agreement with recent analytical predictions and experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469036
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