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  • 1
    Electronic Resource
    Electronic Resource
    A thermodynamic explanation for black smoker temperatures (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 403 (2000), S. 880-883 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There is a remarkable difference between the maximum temperature of black smoker effluent (350 °C–400 °C) and the temperature of the solidifying magma which heats it (∼1,200 °C). It has been suspected for some time that the nonlinear ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35002552
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Regularized spherical harmonic analysis and the 3-D electromagnetic response of the Earth (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 116 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A new form of electromagnetic tensor response function suitable for modelling the 3-D electrical conductivity structure of the spherical Earth was introduced by Zhang & Schultz (1992). The 3-D response tensor ζ can be directly estimated from coefficients of the spherical harmonic expansion of the time variations in the geomagnetic field. Physically, ζ depends both on the horizontal components of B, as well as the horizontal gradient of the vertical component. For conventional spherical harmonic analysis, the aggregate effects of sparse irregularly spaced observations, truncation of the expansion, and noise, results in potentially unbounded oscillatory field behaviour at locations in-between observation points. Such an effect destroys the reliability of estimates of the horizontal gradient in the geomagnetic field derived from resulting spherical harmonic coefficients and impacts our ability to calculate ζ with confidence. We present here a regularized inverse formulation for solving for the spherical harmonic coefficients such that the B field, and its horizontal gradient, are maximally smooth. We examine the l2 norms of the surface integrals of the Laplacian of vertical and horizontal components of B. We find the field that fits the data to a prescribed tolerance such that these norms are simultaneously minimized. The effects of noise and spacing of observation points on the stability of resulting field models and response functions are examined using a synthetic data set produced by the 3-D forward solution of Zhang & Schultz (1992). The trade-off between model misfit and smoothness is emphasized. This formulation involving both vertical and horizontal field components at the surface, termed ‘holomorphically regularized spherical harmonic analysis’ (HRSHA), is relatively insensitive to truncation level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb02133.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comment on ‘The electrical conductivity of the oceanic upper mantle’ by G. Heinson and S. Constable (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 114 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb06999.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A 3-D perturbation solution for the EM induction problem in a spherical earth—the forward problem (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 111 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A solution of the three-dimensional forward problem for electrical conductivity in a spherical earth is considered. This work is based upon the standard decomposition which separates the magnetic field into toroidal magnetic (TM) mode and poloidal magnetic (PM) mode, and the assumption that the lateral inhomogeneity of the conductivity structure of the earth at mid-mantle depths is small. Under this restriction, we apply a perturbation method. The conductivity may be written as the summation of its major part, which is radially symmetric, and a perturbation term which is a function of all three variables, i.e. σ=σ(0)(r) +σ(1) (r, Θ, ϕ).It can be shown that the zeroth-order approximation of the problem is just the one-dimensional case in which the two modes TM and PM can be totally separated. Higher order solutions introduce lateral heterogeneity into the system and make the two modes couple into each other. A finite difference method is used to solve the zeroth-order equation. The first-order perturbation solution depends on the solution to the zeroth-order problem. The three-dimensional perturbation to the initial one-dimensional solution is obtained by expanding a function of conductivity in terms of spherical harmonics. The three-dimensional solution is calculated from the coefficients of this expansion by numerical integration.Preliminary results are compared with Wannamaker's flat earth two dimensional finite element model for a restricted set of conductivity models, and a reasonable agreement is obtained. A three-dimensional model has also been calculated up to second-order approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00580.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Limits to knowledge (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 142-142 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is comforting to some that the realm of quantum theory typified by Heisenberg's uncertainty principle can be placed in a box and neatly ignored by those con-cerned with phenomena on the scale of everyday experience. That modern inverse theory breaks down this artificial barrier, and extends the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372142a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Brent Spar or Broken Spur? (1995)
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 208-208 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In the Commentary by E. Nisbet and C. M. R. Fowler on 29 June 1995 (ref. 1) and in your Opinion piece in the same issue2, the significance of Brent Spar's cargo is measured by the yardstick of the discharge rate of metals by a natural system: the Broken Spur vent field on the Mid-Atlantic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/376208a0
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    Paper (German National Licenses)
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  • 7
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    Color reflectance of ODP Hole 203-1243B (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 203-1243B; Color, a*; Color, b*; Color, L*, lightness; Color, X; Color, Y; Color, Z; Color code HLS-system; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg203; Munsell Color System (1994); North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Spectrophotometer Minolta CM-2002
    Type: Dataset
    Format: text/tab-separated-values, 8865 data points
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    DATA PANGAEA
  • 8
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    Thermal conductivity of ODP Hole 203-1243B (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 203-1243B; Comment; Conductivity, thermal; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Identification; Joides Resolution; Leg203; North Pacific Ocean; Ocean Drilling Program; ODP; Probe Type; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 84 data points
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    DATA PANGAEA
  • 9
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    Hole/Core summary of ODP Site 203-1243 (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 203-1243; Comment; COMPCORE; Composite Core; Cumulative Offset; Curatorial Length Cored; Differential Offset; DSDP/ODP/IODP sample designation; Interval Cored; Joides Resolution; Leg203; North Pacific Ocean; Ocean Drilling Program; ODP; Recovery; Sample code/label; Sampling date; Section Top in meters below surface; Section Top in meters composite depth
    Type: Dataset
    Format: text/tab-separated-values, 209 data points
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    DATA PANGAEA
  • 10
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    Visual core description (VCD) from ODP Hole 203-1243B (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 203-1243B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg203; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Uniform resource locator/link to image
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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