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  • 1
    Series available for loan
    Series available for loan
    Sulphur isotope study of the Muskox intrusion, District of Mackenzie (86 J/13, O/3) (1969)
    Ottawa : Geological Survey of Canada
    Associated volumes
    Details Availability
    Call number: SR 90.0008(68-46)
    In: Paper
    Type of Medium: Series available for loan
    Pages: VII, 68 S.
    Series Statement: Paper / Geological Survey of Canada 68-46
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure-image enhancement by scanning photoacoustic microscopy (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 455-456 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Enhancement of the piezoelectric-photoacoustic signal from surface microstructures is achieved by the contact with silicone oil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343849
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  • 3
    Electronic Resource
    Electronic Resource
    Conductive atomic force microscopy study of InGaN films grown by hot-wall epitaxy with a mixed (Ga+In) source (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1670-1673 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local morphology and electrical properties of InGaN films grown using a hot-wall epitaxy system coupled with a simple mixed source (metallic gallium and indium) were investigated by means of conductive atomic force microscopy. The photoluminescence (PL) wavelengths of two types of samples grown at different substrate temperatures (685 and 660 °C) show different wavelength peaks (400 nm for the former and 420 nm for the latter), even though these samples have almost the same In contents as deduced from x-ray diffraction results. The sample grown at the higher substrate temperature exhibits a very flat morphology with both a roughness of about 3 nm and a low conductive homogeneous distribution. On the other hand, the sample grown at the lower substrate temperature shows a rougher topography and inhomogeneous conductive distribution. The longer PL peak and the inhomogeneous conductive distribution were attributed to the In fluctuation of the InGaN films. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373869
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  • 4
    Electronic Resource
    Electronic Resource
    Amplified spontaneous emission in high power KrF lasers (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 231-236 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A three-dimensional computer code of amplified spontaneous emission for a high power krypton fluoride (KrF) laser amplifier having a cylindrical symmetry and small aspect ratio is developed. The analysis using the present code indicates that the transverse and the longitudinal gain-length product should be smaller than 3 and 10, respectively, if high extraction efficiency is required. Together with a recent experimental result obtained in our 500-J laser, the present code guarantees high efficiency extraction of 500 kJ in a single beam having a 2×3 m2 cross section and a pulse duration of 1 μs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342577
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of performance on tunnel conduction through molecular wire using a conductive atomic force microscope (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3708-3710 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Performance of nonresonant tunnel conduction through a self-assembled monolayer of conjugated molecules fabricated on gold (111) was determined by virtue of nanometer-scale electrical probe measurement using a conductive atomic force microscope. Electrical measurements with nanometer spatial resolution enabled mapping of tunnel current as well as efficiency of tunnel conduction through molecular wire by analyzing length dependence on current. A series of conjugated molecules with different numbers of oligothiophene rings proved to possess a high tunnel-conduction efficiency. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421233
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  • 6
    Electronic Resource
    Electronic Resource
    Sulfur isotopic characteristics of late Cenozoic ore deposits at the arc junction of Hokkaido, Japan (1994)
    Oxford, UK : Blackwell Publishing Ltd
    The @island arc 3 (1994), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract Sulfide minerals of late Cenozoic vein-type deposits of southwest Hokkaido and Kuril Islands yielded δ34CDT S values of 2 to 8 permil, which are typical green-tuff values of magnetite-series igneous terrane. Sulfides of the Kitami district of northeast Hokkaido, on the other hand, are characterized by negative δ34SCDT values, ranging from 0 to - 7 permil. This unique value among ore deposits in the late Cenozoic back-arc terranes in the Japanese Islands is considered to have resulted from extraction of 32S enriched sulfur from the basement rocks, because of well-developed N-S fracturing in the basement, which is characteristic of the axial belt and Kitami district of Hokkaido.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.1994.tb00100.x
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  • 7
    Electronic Resource
    Electronic Resource
    Pathogen invasion and host extinction in lattice structured populations (1994)
    Springer
    Journal of mathematical biology 32 (1994), S. 251-268 
    Details
    ISSN: 1432-1416
    Keywords: Lattice model ; Host extinction ; Pathogen invasion ; Improved pair approximation (IPA) ; Contact process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We examined the propagation of an infectious disease and the eventual extinction of the host population in a lattice-structured population. Both the host colonization and pathogen transmission processes are assumed to be restricted to act between the nearest neighbor sites. The model is analyzed by an improved version of pair approximation (IPA). Pair approximation is a technique to trace the dynamics of the number of nearest neighbor pairs having particular states, and IPA takes account of the clustering property of lattice models more precisely. The results are checked by computer simulations. The analysis shows: (i) in a one-dimensional lattice population, a pathogen cannot invade a host population no matter how large is the transmission rate; (ii) in a two-dimensional lattice population, pathogens will drive the host to extinction if the transmission rate is larger than a threshold. These results indicate that spatially structured population models may give qualitatively different results from conventional population models, such as Lotka-Volterra ones, without spatial structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163881
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  • 8
    Electronic Resource
    Electronic Resource
    Speed of invasion in lattice population models: pair-edge approximation (1998)
    Springer
    Journal of mathematical biology 36 (1998), S. 469-484 
    Details
    ISSN: 1432-1416
    Keywords: Key words: Invasion ; Lattice model ; Pair approximation ; Wave speed ; Stochastic spatial model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract.  We propose a simple approach to approximating the speed of invasion in lattice population models. Approximate critical parameter values for successful invasion are then found by solving for zero wave speed. The approximation is based on describing the occupied region by the ordinary pair approximation, and using quasi-steady-state pair approximations to describe the leading edge of the wave front. We illustrate this idea using the basic contact process on the 1 and 2 dimensional lattice (with and without nearest-neighbor migration), finding very good agreement between the approximation and simulation results. The approximate critical values obtained by our approximation are significantly more accurate than those obtained by the ordinary pair approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002850050109
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  • 9
    Electronic Resource
    Electronic Resource
    Antigenic Drift of Viruses Within a Host: A Finite Site Model with Demographic Stochasticity (2000)
    Springer
    Journal of molecular evolution 51 (2000), S. 245-255 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Antigenic drift — Phylogeny — Demographic stochasticity — Human immunodeficiency virus — Equine infectious anemia virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. We theoretically study the antigenic drift of viruses within an infected host, as observed in human immunodeficiency virus (HIV) and equine infectious anemia virus (EIAV) infections, assuming that a finite number of antigen-determining sites at the viral envelop gene are responsible for the specific immune response. The pattern of antigen evolution becomes more complex than that predicted from the previous one-dimensional antigen space models. If the viral growth rate is sufficiently large, the demographic stochasticity for the fate of a new antigen mutant can be neglected. The high dimensionality in the way a virus escapes the immune defense in genotype space could then causes a rapid increase in the antigenic diversity and the total viral density, until finally the whole antigen genotypes are used up. The viral population is then driven to extinction in a host by the enhanced immune response to all genotypes. In contrast, if the viral growth rate is moderate or small so that only a small fraction of new antigen mutants can survive during the initial endangered period of random extinction, the viral antigenic diversity and the total density remain bounded, thereby enabling them to persist for a prolonged period by shifting the dominant antigen types. The phylogenetic pattern of antigen divergence is well characterized by the mean number of surviving antigen mutants from an antigen genotype. The substitution rate at antigen-determining sites increases as the efficiency of host immune response increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002390010086
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  • 10
    Electronic Resource
    Electronic Resource
    Emergence of cooperation and evolutionary stability in finite populations (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 428 (2004), S. 646-650 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To explain the evolution of cooperation by natural selection has been a major goal of biologists since Darwin. Cooperators help others at a cost to themselves, while defectors receive the benefits of altruism without providing any help in return. The standard game dynamical formulation is the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02414
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