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  • 1
    Monograph available for loan
    Monograph available for loan
    London [u.a.] : Academic Press
    Call number: G 7417 ; 10267 ; M 93.0226 ; G 7090
    Type of Medium: Monograph available for loan
    Pages: IX, 484 S. : graph. Darst.
    ISBN: 0120734508
    Location: Upper compact magazine
    Location: Upper compact magazine
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2016-03-11
    Keywords: GENERAL
    Type: A-5 , AEC, Oak Ridge, Tenn. Proc. of the Symp. on the Protect. against Radiation Hazards in Space, Book 1; p 86-87
    Format: text
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  • 3
    Publication Date: 2006-10-26
    Description: Solar proton event information from ionospheric radio observations
    Keywords: PROPULSION SYSTEMS
    Format: text
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  • 4
    Publication Date: 2011-08-16
    Description: Daylight ionospheric scatter propagation and absorption during energetic electron precipitation event in auroral zone using bremsstrahlung observations at balloon altitude
    Keywords: GEOPHYSICS
    Type: ; 459 (
    Format: text
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  • 5
    Publication Date: 2011-08-16
    Description: Two events in August 1967, categorized as relativistic electron precipitation (REP) events by their effect on VHF transmissions propagated via the forward-scatter mode, have been examined with regard to the energy spectra of trapped and precipitated electrons. These two substorm-associated events August 11 and August 25 differ with respect to the relativistic, trapped electron population at synchronous altitude; in the August 25 event there was a nonadiabatic enhancement of relativistic (greater than 400 keV) electrons, while in the August 11 event no relativistic electrons were produced. In both events electron spectra deduced from bremsstrahlung measurements (made on a field line close to that of the satellite) had approximately the same e-folding energies as the trapped electron enhancements. However, the spectrum of electrons in the August 25 event was significantly harder than the spectrum in the event of August 11.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics; 34; Dec. 197
    Format: text
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  • 6
    Publication Date: 2011-08-12
    Description: Electron precipitation into ionosphere and mesosphere in auroral zone studied for quantitative aspects from ground based and space observations
    Keywords: GEOPHYSICS
    Type: ; ACE(
    Format: text
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  • 7
    Publication Date: 2011-08-11
    Description: Characteristics of relativistic electron precipitation events in and near auroral zone during day and night
    Keywords: GEOPHYSICS
    Type: JOURNAL OF GEOPHYSICAL RESEARCH
    Format: text
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  • 8
    Publication Date: 2012-04-01
    Description: A recent database and world distribution map of carbonatites supports previous observations of the spatial and temporal aspects of these rocks, and provides new observations that are important for understanding their petrogenesis. These data reveal that there is an overwhelming concentration of carbonatites in Precambrian cratonic areas, most of which are elevated topographically. Thus, although approximately two-thirds of carbonatites are Phanerozoic in age, at least 88% of all dated carbonatites are located in the cratons, demonstrating a remarkable tendency for a Precambrian host. This observation suggests a link with kimberlites as diamond-bearing kimberlites are confined to the Archaean areas of cratons. The age data show that in many carbonatite-bearing provinces there has been repetition of carbonatite emplacement, with up to five episodes separated by hundreds of millions of years. In at least three provinces such activity extends from the late Archaean to relatively recent times and, because of the drift of the plates, this would seem to preclude any direct role for mantle plumes in carbonatite genesis. Magmatism is activated when lithosphere lesions are reopened in response to major changes in global plate movement patterns.
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
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  • 9
    Publication Date: 2012-04-01
    Description: In the Calatrava province of central Spain, numerous Quaternary pyroclastic vents have erupted carbonatite magmas carrying silicate melt fragments, mantle debris and megacrysts. Lava flows are rare. Maar and scoria deposits have carbonate matrices and pass into tuff sheets with carbonate contents 〉50%, which are spread widely away from the eruptive centres and constitute the most abundant form of effusive carbonate. Immense quantities of mantle debris are present in the erupted material. The tuffs have a distinctive fabric, which consists of a pale matrix carrying black silicate glass clasts that contain globules of immiscible carbonate and carbonate phenocrysts. There is evidence of similar volcanism in the Limagne province of central France and in other intra-continental provinces in Europe and Africa. About 500 vents have been identified in France and Spain: all the vents examined to date have erupted carbonatite magma. Such eruptions are not generally recognized in classical volcanology. As pyroclastic carbonatite was not previously recognized in Spain and France, a detailed examination of other mafic and ultramafic alkaline provinces, where research has traditionally concentrated on lava flows, is vital. For any search to be successful, evidence from the pyroclastic rocks will be required.
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
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  • 10
    Publication Date: 1974-06-01
    Description: Experimental determinations of the dry liquidus temperatures of two pantellerite, and two pantelleritic trachyte glasses in the pressure range 0–2 kilobars, show minima in the liquidus curves between 0.1 and 0.2 kb. The pantellerite minima are 830°–850° C; the trachyte minima are 920°–940° C. At pressures below the minima a separate vapour phase co-exists with liquid, at higher pressures the intrinsic volatiles are completely soluble in the liquid and the liquidus curves have a positive dT/dP . Similar results have been obtained from a range of other pantelleritic glasses, and together with consistent alkali feldspar compositions (from a wide range of experimental conditions) are indicative of a close approach to equilibrium. The form of the liquidus curves above the minima, if rellecting natural conditions, offers a ready explanation of the near-or super-liquidus aspect of many peralkaline lavas. The temperatures in these anhydrous experiments are 100°–150° C higher than those for similar compositions in the presence of excess water. (Also, in the presence of excess water, the crystallization sequences in the natural glasses are profoundly modified, with pyroxene appearing on the liquidus). At lower pressures, feldspar is the liquidus phase in the dry pantellerites, but is joined by quartz around 1 kb, and superseded by quartz at higher pressures. As pantellerites with quartz phenocrysts are uncommon, low pressure equilibration is perhaps normal in these magmas. Feidspar is the usual liquidus phase in the trachytes, except at very low pressures where it is preceded by iron oxide. Preliminary studies at 5 kb indicate that the pantelleritic and trachytic liquidus curves are converging (in the range 950°–1000° C). Crystallization sequences, and the forms and positions of the solidus curves are therefore of vital importance. These, together with the vapour-present/vapour-absent conditions, are currently under investigation. ©1974 Stabilimento Tipografico Francesco Giannini & Figli
    Print ISSN: 0258-8900
    Electronic ISSN: 1432-0819
    Topics: Geosciences
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