GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 35 (1987), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: An inversion algorithm for interpreting electrical soundings based on a probabilistic treatment of the a priori information not only includes all the previous ones, but allows consideration of the constraints between the parameters. By introducing the a priori information, a unique solution among all the equivalent ones is obtained which is coherent with the geological background. Several examples dealing with the usual problems in the automatic interpretation of the electrical soundings illustrate the advantages of this algorithm. Good results are obtained with this method.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 127 (1996), S. 0 
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: An analytical solution and its application to compute 2-D geoid anomalies, based on Brun's formula (Heiskanen & Moritz 1967), was developed by Chapman (1979). In this paper we present the derived solution from a thorough review of Chapman's algorithm. Apart from some typographical errors in the mathematical expressions, we have found that some of the precautions given by the author are not necessary when the algorithm is applied, in particular those regarding the unit system, topography and density contrast.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 110 (1992), S. 0 
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: An inversion algorithm which takes into account the varying geometry in magnetotelluric models is considered. The particular problem of estimating the shape of the interface between two different conductivities is studied. This boundary is represented by an implicit function and its parameters are calculated in the inversion process. The assumption of using such a function allows us to simplify the computation of the sensitivity matrix of the model, and gives a stronger numerical stability to the inversion procedure. The finite element method is used to solve the forward problem. The inversion algorithm is based on a Bayesian approach that allows the introduction of a priori information. Several examples with simple geometries show the possibilities offered by the algorithm.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 100 (1990), S. 0 
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Several attenuation studies have established a frequency dependence law of the anelastic attenuation factor Q in the form Q=Qo(f/fo)v for the approximate 1–10 Hz frequency range. We propose a method that leads to the determination of Qo, which is a function of the reference frequency fo, and the real exponent v with a single station. to carry out the problem we determine a set of master curves as a function of v. We discuss the method, and the different features of the master curves, when it is applied to the complicated regions of the Iberian Peninsula and to several instruments with different responses. Using this new method and the seismographic stations available in the Iberian Peninsula we have mapped iso-Q0 lines, at a reference frequency of 1 Hz, applying inversion methods. the Q0 values determined for Iberia vary between about 100 and about 600. Values close to 100 correspond to the southern part of Iberia. In general, Qo values increase from south to north with values about 600 near the NW part of Iberia. the Pyrenees Mountains and adjacent areas present Q0 values between about 200 and about 350. These results suggest a strong Q0 lateral variation in Iberia. A considerable frequency dependence of coda-Q has also been determined. the v values vary between 0.3 and 0.8. the Q0 values obtained in the Iberian Peninsula show very good agreement with several Q0 values obtained in other regions of the world. Comparison between the iso-Q0 lines and other geophysical parameters, like regional variations of Pn velocities, heat flow, isoseimal intensity distribution and crustal thickness, indicates that lower Q0 values are associated with higher isoseismal intensity attenuation, higher heat flow, lower Pn velocities and thinner crust.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Social Science & Medicine 27 (1988), S. 1337-1342 
    ISSN: 0277-9536
    Schlagwort(e): France ; ageing ; disability ; life events
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Medizin
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Pure and applied geophysics 132 (1990), S. 639-652 
    ISSN: 1420-9136
    Schlagwort(e): Seismic tomography ; local inhomogeneities ; probability ; maximum likelihood
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract A simple method to contour local inhomogeneities using seismic data is proposed. It formalizes an approximate inversion method which is based on the interpretation of local inhomogeneities as making the differences between an actual seismic data set and a previous reference model. It uses the optimal statistical criteria of parameter estimation and recognition and the ray representation of the waves spreading. Any combination of direct, reflected and/or other types of waves may be used as the database. Inhomogeneities, having a size two times above the wavelength of the seismic waves, can be resolved. Laboratory experiments, using ultrasonic waves and analysis of data from field experiments, confirmed the theoretical results. The method can be used to search for ore bodies, kimberlite cubes, oiltraps, etc.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    European journal of orthopaedic surgery & traumatology 4 (1994), S. 179-184 
    ISSN: 1432-1068
    Schlagwort(e): Idiopathic scoliosis ; Orthopaedic management ; Wilmington Body-Jacket ; Scoliose idiopathique ; Traitement orthopédique ; Wilmington Body Jacket
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé Nous avons revu 223 scolioses idiopathiques, scolioses juvéniles (71 %) ou de l'adolescent (29 %), traitées par Body-Jacket de Wilmington, à un âge moyen de 13 ans. La valeur angulaire moyenne à la mise en place du traitement était de 26° pour les doubles majeures, 28° pour les courbures thoraciques uniques, 23° pour les thoraco-lombaires, 24° pour les lombaires. Les corrections angulaires sous corset sont de l'ordre de 50 %. A l'arrêt du traitement, (âge moyen de 15 ans 5 mois, durée moyenne du traitement 2 ans 2 mois) on constate globalement une stabilisation angulaire (+ 5°) dans 53 % des cas, une amélioration supérieure à 6° dans 31 % des cas, une aggravation supérieure à 6° dans 15 % des cas. 12 scolioses (7 %) (dont 8 de localisation thoracique) ont été opérées. Concernant les courbes thoraco-lombaires et lombaires, une stabilisation (± 5°) ou une amélioration sont obtenues dans 83 à 99 % des cas, selon qu'il s'agit d'angles inférieurs ou supérieurs à 30°. La répartition topographique des courbes traitées (49 % lombaires, 14 % thoraco-lombaires, 26 % thoraciques de sommet inférieur à D7, 11 % doubles majeures) traduit les qualités de réduction et de maintien de cette orthèse au niveau lombaire et thoracolombaire, et notre souci de maintenir ces courbes en deçà de 30° à maturation osseuse.
    Notizen: Summary We reviewed 223 idiopathic scoliosis, juvenile scoliosis (71%) or adolescent scoliosis (29%), treated by Wilmington Body Jacket at an average age of 13 years. The mean angular value when treatment started was 26° for the double-major curves, 28° for the single thoracic curves, 23° for the lumbothoracic curves, 24° for the lumbar scoliosis. There are 50% angular corrections within the body jacket. At the end of the treatment, the average age is 15 years 5 months (the average duration of treatment is 2 years 2 months). At all, 53% of curves are stabilized (± 5°), 31,5% improved 6° or more, and 15,5% progressed more than 6° (but only 12 scoliosis (7%) warrant fusion. 8 of them were thoracic curves). With regards to the thoracolumbar and the lumbar curves, a stabilization (± 5°) or an improvement more than 6° are obtained in 83 to 90% of cases, depending on whether the initial angles were more or less than 30°. The topography of the curves treated (49% of lumbar curves, 14% of thoracolumbar curves, 26% of thoracic curves, with apex level below T7, 11% of double major curves) points out the qualities of correction and the efficacity of these orthosis at a lumbar and thoracolumbar level and it shows our care to maintain these curves below 30° at bone maturity.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Springer
    International orthopaedics 7 (1983), S. 1-9 
    ISSN: 1432-5195
    Schlagwort(e): Transplantation ; Pedicle iliac crest epiphysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé La crête iliaque a été pédiculée sur ses vaisseaux épiphysaires et transplantée sur le toit du cotyle en position intra-articulaire, en remplacement de la portion latérale de l'acétabulum qui a été réséquée chez 30 chiots âgés de 3 mois. Les meilleurs résultats sur la congruence articulaire, le maintien de la tête fémorale et l'aspect de la surface cartilagineuse aprés 9 à 18 mois, ont été obtenus dans les cas de greffons pédiculés verticalement insérés. En effet, ceux-ci sont le siège d'une croissance propre, évitant à la butée de remonter avec la croissance, et leur surface articulaire présente, en rapport avec la bonne vascularisation du cartilage hyalin sous-jacent, un aspect de cartilage normal. A la lumière de cette expérimentation, les auteurs proposent une nouvelle technique de traitement de certains états dysplasiques de la hanche chez l'enfant.
    Notizen: Summary Pedicled iliac crest epiphysis transplantation was performed after resection of the outer portion of the acetabulum in 30 puppies 3 months old. The best joint congruency was obtained when using a vertical pedicled graft, the surface of which developed into normal articular cartilage through metaplasia, and presented normal cartilage growth by means of conservation of the epiphyseal vessels. The results of this experiment enable the authors to propose a new surgical technique in the treatment of certain difficult dysplastic conditions in the hip.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 3 (1985), S. 226-235 
    ISSN: 0736-0266
    Schlagwort(e): Hereditary sensory neuropathy ; Bone resorption ; Osteoclasts ; Vascular reflex ; Life and Medical Sciences
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: This study concerns two children, from the same otherwise normal family, presenting progressive spontaneous amputations of the limbs, suggesting peripheral hereditary sensory neuropathy. Samples from the distal nerves and vessels and the distal tibial epiphyses were examined ultrastructurally. The nerves showed signs of degeneration, and a typical bone necrosis, without osteoclasts, was observed in the 2 cm margin of the samples. Simultaneous modifications of the vessels suggest a neurally initiated vascular reflex resulting in bone destruction. Theories that might explain the observations are discussed.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Publikationsdatum: 2021-02-08
    Beschreibung: One of the most remarkable natural events on Earth are the large lateral flank collapses of oceanic volcanoes, involving volumes of rock exceeding tens ofkm3• These collapses are relatively frequent in recent geological times as supported by evidence found in the geomorphology of volcanic island edifices and associated debris flows deposited on the proximal ocean floor. The Island of Fogo in the Cape Verde archipelago is one of the most active and prominent oceanic volcanoes on Earth. The island has an average diameter of 25 km and reaches a maximum elevation of 2829 m above sea level (m a.s.l.) at Pico do Fogo, a young stratovolcano located within a summit depression open eastward due to a large lateral flank collapse. The sudden collapse of the eastern flank of Fogo Island produced a megatsunami -73 ky ago. The limits of the flank collapse were deduced as well from geomorphologic markers within the island. The headwall of the collapse scar is interpreted as either being located beneath the post-collapse volcanic infill of the summit depression or located further west, corresponding to the Bordeira wall that partially surrounds it. The magnetotelluric (MT) method provides a depth distribution of the ground resistivity obtained by the simultaneous measurement of the natural variations of the electric and magnetic field of the Earth. Two N-S magnetotelluric profiles were acquired across the collapsed area to determine its geometry and boundaries. The acquired MT data allowed the determination of the limits of the collapsed area more accurately as well as its morphology at depth and thickness of the post-collapse infill. According to the newly obtained MT data and the bathymetry of the eastern submarine flank of Fogo, the volume involved in the flank collapse is estimated in -110 km3 • This volume -the first calculated onshore- stands between the previously published more conservative and excessive calculations -offshore- that were exclusively based in geomorphic evidence. The model for the summit depression proposing two caldera collapses preceding the collapse of the eastern flank of Fogo is supported by the MT data.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...