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Monographie ausleihbar

Seismic reflection probing of the continents and their margins : selected papers presented at the 6th International Symposium on "Seismic Reflection Probing of the Continents and their Margins", held in Budapest, Hungary, 12-17 September, 1994 (1996)

White, D. J. [Hrsg.] ; Ansorge, J. [Hrsg.] ; Bodoky, T. J. [Hrsg.]

Amsterdam : Elsevier

Dazugehörige Bände

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Signatur: ILP/M 06.0134

In: Publication of the International Lithosphere Programme

In: Tectonophysics

Materialart: Monographie ausleihbar

Seiten: X, 392 S. : Ill., graph. Darst.

Serie: Publication of the International Lithosphere Programme 300

Standort: Lesesaal

Zweigbibliothek: GFZ Bibliothek

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Images of a lower-crustal oceanic slab: Direct evidence for tectonic accretion in the Archean western Superior province (2007)

White, D. J. ; Musacchio, G. ; Helmstaedt, H. H. ; [weitere]

Geological Society of America

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Publikationsdatum: 2017-04-04

Beschreibung: The Archean western Superior province in Canada is the type area for proposed Archean plate tectonics. Seismic images from this region provide direct evidence for assembly of the craton by terrane accretion and for a large slab of remnant oceanic crust preserved at the base of the crust. This slab, with inferred garnet amphibolite composition, adds a critical piece of evidence to previous suggestions that Archean subduction was at a shallow angle and that some Neoarchean tonalite-trondhjemite-granodiorite suites, distinct from most modern-day suprasubduction magmas, are melts primarily derived directly from subducted slabs.

Beschreibung: LITHOPROBE, Queen's University, Geological Survey of Canada

Beschreibung: Published

Beschreibung: 997–1000;

Beschreibung: 3.3. Geodinamica e struttura dell'interno della Terra

Beschreibung: JCR Journal

Beschreibung: reserved

Schlagwort(e): Archean ; teconics ; seismic ; subduction ; accretion ; 04. Solid Earth::04.07. Tectonophysics::04.07.01. Continents ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics

Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Materialart: article

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Digitale Medien

Shallow crustal structure beneath the Juan de Fuca Ridge from 2-D seismic refraction tomography (1990)

White, D. J. ; Clowes, R. M.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 100 (1990), S. 0

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ISSN: 1365-246X

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie

Notizen: The formation of oceanic lithosphere along ocean ridges, and the role that crustal magma chambers play in the accretionary process, continue to be fundamental issues in plate tectonics. To address these issues, a multireceiver airgun/ocean-bottom seismograph refraction line was shot across the Endeavour segment of the Juan de Fuca Ridge near 48° N, 129° W. 2-D traveltime tomography applied to the data results in a three-layer model for the upper crust. Layer 1 is 250–650 m thick, with v1= 2.5 km s−1 and ∇Vzv1= 0.5 s−1. Layer 2 is ∼800 m thick, v2= 4.8 km s−1 and ∇Vzv2= 1.0 s−1. Layer 1 and layer 2 probably represent the sequence of extrusives and the transition to layer 3 (v3= 5.8 km s−1, ∇Vzv3= 0.5 s−1) is associated with the extrusives-dike complex transition. An abrupt velocity transition between layer 1 and layer 2 may be a metamorphic front within the basalt pillows or it may be the depth to which surface fissures penetrate. A low-velocity anomaly (velocities decreased by 〈 0.45 km s−1) exists beneath the ridge in layer 2 and upper layer 3. It is interpreted as a zone of increased fracture porosity and/or permeability associated with axial hydrothermal circulation, and correlates reasonably well with a sub-axial reflector. No evidence is found for the existence of a crustal magma chamber in the depth range of 1.5–3.5 km sub-bottom. However, the velocity anomalies observed in layer 3 suggest that crustal temperatures in this layer are elevated by 150–250°C beneath and to the east of the ridge relative to temperatures west of the ridge.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb00690.x

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Two-Dimensional Seismic Refraction Tomography (1989)

White, D. J.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 97 (1989), S. 0

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ISSN: 1365-246X

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie

Notizen: An iterative tomographic inversion scheme is presented for determination of 2-D velocity structure from seismic refraction first-arrival traveltimes. the method is suited to refraction profiles where source/receiver spacings are denser than for conventional profiles. the inversion method is based on an iterative solution of the linearized problem, and allows for determination of continuous velocity variations as welt as geometry of subhorizontal interfaces. In each iteration, two-point ray tracing is performed using a shooting method to construct the linear system. the velocity field is defined using triangular cells within which the velocity gradient is constant, allowing analytic calculation of ray paths. Two different inversion techniques are considered, based on distinct linearized formulations of the forward problem. Inversion using a linearized traveltime-velocity Jacobian produced better results than a slowness formulation more akin to common series expansion-techniques. Resolution examples reveal horizontal smearing due to ray geometry, drop-off in resolution with depth, as well as the effect of source-receiver geometry and velocity structure on resolution. Inversion examples indicate that a global norm produces solutions closer to the true model than solutions calculated using a smallest perturbation approach, when a good starting model is available. Streak effects caused by inhomogeneous ray coverage and the removal of these effects are demonstrated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb00498.x

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Gelatinous Fibres in Ash ( Fraxinus excelsior L.) (1965)

WHITE, D. J. B. ; ROBARDS, A. W.

[s.l.] : Nature Publishing Group

Nature 205 (1965), S. 818-818

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The difficulty of recognizing gelatinous fibres in ash suspected of containing tension wood has been remarked on by a number of authors1?4. The difficulty appears to be due to the lack of a distinct G-layer. Recently a piece of fast-grown ash came into our possession. Sections which were taken ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/205818a0

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Extended X-ray absorption fine structure studies on periplasmic and intracellular molybdenum-binding proteins (1999)

Duhme, A.-K. ; Meyer-Klaucke, W. ; White, D. J. ; [weitere]

Springer

JBIC 4 (1999), S. 588-592

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ISSN: 1432-1327

Schlagwort(e): Key words Molybdenum ; Extended X-ray absorption fine structure ; Binding proteins ; Metal coordination

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract We have studied the molybdenum K-edge X-ray absorption spectra of Mo bound in the Mo-binding proteins Mop from Haemophilus influenzae, ModG from Azotobacter vinelandii and the Escherichia coli ModE transcriptional regulatory protein, and compared them with the absorption spectra of A. vinelandii ModA and monomeric molybdate. Pre-edge and extended fine structure data indicate that the Mo-binding proteins with molbindin-like domains bind tetrahedral molybdate with a Mo-O distance of 1.76 Å. The molbindin subunits or sub-domains represent a novel protein fold that is used by proteins with distinct functions to bind molybdate in the cytoplasm. The high specificity of the proteins for molybdenum does not depend on a change of coordination number or geometry.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s007750050381

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Epsilon efficiency (1986)

White, D. J.

Springer

Journal of optimization theory and applications 49 (1986), S. 319-337

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ISSN: 1573-2878

Schlagwort(e): Efficient sets ; ε-efficiency ; weighting factors ; constrained objectives ; penalty functions ; ideal points ; Markov decision processes

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Abstract This paper considers the extension of ε-optimality for scalar problems to vector maximization problems, or efficiency problems, which havem objective functions defined on a set $$X \subseteq \mathbb{R}^n $$ . It is shown that the natural extension of the scalar ε-optimality concepts [viz, given ε〉0, given a solution setS, ifx∈S there exists an efficient solutiony with ∥f(x)−f(y)∥≦ε, and given an efficient solutiony, there exists anx∈S with ∥f(x)−f(y)∥≦ε] do not hold for some methods used. Six concepts of ε-efficient sets are introduced and examined, to a very limited extent, in the context of five methods used for generating efficient points or near efficient points. In doing so, a distinction is drawn between methods in which the surrogate optimizations are carried out exactly, and those where terminal ε-optimal solutions are obtained.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00940762

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Multiobjective programming and penalty functions (1984)

White, D. J.

Springer

Journal of optimization theory and applications 43 (1984), S. 583-599

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ISSN: 1573-2878

Schlagwort(e): Efficient sets ; penalty functions ; point convergence ; set convergence ; limit sets

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Abstract This paper generalizes the penalty function method of Zang-will for scalar problems to vector problems. The vector penalty function takes the form $$g(x,\lambda ) = f(x) + \lambda ^{ - 1} P(x)e,$$ wheree ⊀R m, with each component equal to unity;f:R n →R m, represents them objective functions {f i} defined onX $$ \subseteq $$ R n; λ ∈R 1, λ〉0;P:R n →R 1 X $$ \subseteq $$ Z $$ \subseteq $$ R n,P(x)≦0, ∨x ∈R n,P(x) = 0 ⇄x ∈X. The paper studies properties of {E (Z, λ r )} for a sequence of positive {λ r } converging to 0 in relationship toE(X), whereE(Z, λ r ) is the efficient set ofZ with respect tog(·, λr) andE(X) is the efficient set ofX with respect tof. It is seen that some of Zangwill's results do not hold for the vector problem. In addition, some new results are given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00935007

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A penalty function approach for solving bi-level linear programs (1993)

White, D. J. ; Anandalingam, G.

Springer

Journal of global optimization 3 (1993), S. 397-419

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ISSN: 1573-2916

Schlagwort(e): Bi-level programming ; penalty function ; non-convex optimisation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Abstract The paper presents an approach to bi-level programming using a duality gap—penalty function format. A new exact penalty function exists for obtaining a global optimal solution for the linear case, and an algorithm is given for doing this, making use of some new theoretical properties. For each penalty parameter value, the central optimisation problem is one of maximising a convex function over a polytope, for which a modification of an algorithm of Tuy (1964) is used. Some numerical results are given. The approach has other features which assist the actual decisionmaking process, which make use of the natural roles of duality gaps and penalty parameters. The approach also allows a natural generalization to nonlinear problems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01096412

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Extension of the Frank-Wolfe algorithm to concave nondifferentiable objective functions (1993)

White, D. J.

Springer

Journal of optimization theory and applications 78 (1993), S. 283-301

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ISSN: 1573-2878

Schlagwort(e): Optimization ; concave functions ; subgradients

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Abstract In this paper, we provide the theoretical foundations of an extension of the Frank-Wolfe algorithm for concave continuously differentiable objective functions to concave nondifferentiable objective functions, using a subgradient approach. The main theorem extends the results of Frank and Wolfe. A key main assumption is examined in the context of some special cases via three lemmas. A comparison is made with other subgradient approaches, and consideration is given to the two subproblem optimizations arising in the modified algorithm.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00939671

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