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  • 1995-1999  (4)
  • 1950-1954  (1)
  • 1935-1939  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2495-2500 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical and optical properties of defects due to ion implantation of ruthenium in silicon have been studied by means of junction space-charge techniques. Two energy levels were observed with energy positions at Ec−0.184 eV (A-level) and EV+0.265 eV (B-level), respectively, at 77 K. The changes in enthalpy due to the capture of electrons and holes were −8 meV (A-level) and 1 meV (B-level). Gibb's free energies at different temperatures were calculated for both levels. Good agreement with the corresponding optical threshold energy was found for the B-level suggesting a small Frank–Condon shift. A tentative model for the origin of the observed defects is discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5312-5317 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectral distributions of the hole photoionization cross section of the deep sulfur center in silicon have been measured at 10 different temperatures within the range 75 K≤T≤297 K applying the steady-state photocurrent technique. Zero-phonon hole binding energies of the deep donor level have been determined at these temperatures by using a detailed numerical fitting procedure. The temperature dependence of the hole binding energy is well described by a novel analytical formula with a zero-temperature binding energy of 557 meV. Further analysis of our data resulted in a lattice adjustment energy (Franck–Condon shift) of 51 meV and an associated average phonon energy of 33 meV. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2610-2612 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Capacitance transients caused by capture and emission of electrons from buried metal disks are investigated. A single layer of tungsten disks, arranged in a square lattice, is introduced into GaAs by epitaxial overgrowth and a depleted layer is formed around the disks due to the metal–semiconductor Schottky barrier. The number of captured electrons on each disk is measured by the capacitance associated with the width of the depletion layer, whereas the capacitance transients reflect the changes in the number of excess electrons on the disks. By investigating the emission time constants for varying numbers of electrons in excess on the disks, the Coulomb effect is studied. In combination with a temperature-dependent capture, a Coulomb charging energy of only 4 meV is shown to shift the measured activation energies erroneously by hundreds of meV. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 7 (1954), S. 477-481 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Summary The author who for over 30 years has studied deep-sea sediments and especially the Red clay has, especially on basis of results from the Swedish Deep-Sea Expedition with the “Albatross”, arrived at the conviction that the current explanation for the disappearance of the lime leading to the formation of Red clay is not sufficient. The formation of Red clay during Tertiary time cannot be ascribed to the action of cold Antarctic and Arctic bottom currents, which must have been very feeble or missing, when there were no polar ice-caps and the bottom temperature of the oceans was about 8° to 10° higher than at present. A principal lime-dissolving agency, responsible for the formation of Red clay are “magmatic volatiles”, i.e. carbon dioxide, hydrochloric acid etc., released at submarine volcanic eruptions or at the extrusion of subcrustal matter, leading to the formation of the Madatlantic Ridge and other submarine ridges.
    Abstract: Résumé L'auteur qui, depuis plus de 30 années, étudie les sédiments abyssaux et, en particulier, les argiles rouges, est convaincu, et cela notamment depuis l'expédition océanographique suédoise de «Albatross», que l'explication courante de la disparition du calcaire qui conduit à la formation de cette argile n'est pas suffisante. Pendant la période tertiaire, on ne peut pas en attribuer la formation à l'action, de courants très froids arctiques et antarctiques parcourant le fonds des océans, car ceux-ci durent être très faibles, voire inexistants si l'on admet que les calottes glaciaires des pôles n'existaient pas et que la température abyssale était supérieure de 8° à 10° C à celle d'aujourd'hui. Le principal agent solvant du calcaire à l'origine des argiles rouges doit être reconnu dans certaines volatilisations du magma, tels le dioxyde de carbone et l'acide chlorhydrique par exemple. Celles-ci doivent avoir été provoquées par des éruptions volcaniques sous-marines ou par des extrusions de matériaux volcaniques qui ont conduit à la formation de nombreuses chaînes de montagnes sous-marines comme par exemple celle du centre de l'Atlantique.
    Notes: Zusammenfassung Der Verfasser, der seit mehr als 30 Jahren die Tiefseesedimente und insbesondere den Roten Ton untersucht, ist namentlich auf Grund der Ergebnisse der Schwedischen Tiefsee-Expedition mit der „Albatross” zur Überzeugung gelangt, daß die landläufige Erklärung für das Verschwinden des Kalks, dank dessen es zur Bildung des Roten Tones kommt, nicht genügt. Die Bildung desselben während des Tertiärs darf nicht der Wirkung kalter antarktischer und arktischer Grundströmungen zugeschrieben werden; diese werden im Gegenteil sehr schwach gewesen sein oder gar nicht existiert haben, da es damals keine polaren Eiskappen gab und die Bodentemperatur der Ozeane um 8 bis 10° C höher war als heute. Viel eher kommen für die Bildung des Roten, Tones magmatische Gase wie CO2, HCl usw. als wichtigste Kalklöser in Betracht, die zu der Zeit ausgeworfen wurden, als submarine Vulkanausbrüche oder Extrusionen von Tiefenmaterial zur Bildung des mittelatlantischen Rückens und anderer submariner Gebirgszüge geführt haben.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 144 (1939), S. 332-333 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE new Oceanographic Institute which Göteborg's Vetenskaps- och Vitterhetssamhälle owes to the munificence of the late Mr. K. A. Wallenberg is provided with a vertical plankton shaft, two metres in diameter and twelve metres deep, which affords facilities for culture experiments on a fairly ...
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1084
    Keywords: Time resolve ; Transillumination measurements ; Breast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The objective of this study was to evaluate a pulsed laser transillumination technique based on time-resolved detection on breast-tissue-like phantoms. Experiments have been performed on tissue-like plastic phantoms with different scattering characteristics. The effects of time-gate width, size, localisation and refractive index of hidden objects have been scrutinised. Our study showed that the shorter the time-gate the higher the contrast. The contrast is very dependent on the size of the hole, whereas the full width half maximum is not. Furthermore, the investigation showed that the changes of early detected light in an experimental setting is due to scattering, and not to a higher speed of the transmitted light
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 27 (1939), S. 859-860 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 113 (1938), S. 366-366 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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