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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Psychiatry Research 29 (1989), S. 283-284 
    ISSN: 0165-1781
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Ionics 28-30 (1988), S. 539-541 
    ISSN: 0167-2738
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
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    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 70:1 (1975:Jan./Feb.) 15 
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Rock mechanics and rock engineering 14 (1981), S. 27-35 
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Description / Table of Contents: Zusammenfassung Überblick über die Beobachtung von Fels mit Hilfe der „Acoustic-Emission-Technik“ Um 1940 wurde die „Acoustic-Emission-Technik“ zum erstenmal von Obert und Duvall1 in den USA und von Hodgsen2 in Kanada im Bergbau zur Überwachung des Gebirges eingesetzt. Derzeit wird versucht, diese Technik, die damals (und manchmal auch noch heute) „microseismic monitoring“ genannt wurde, über den Bergbau hinaus bei einer Vielzahl von Problemen im Zusammenhang mit dem Tiefbau anzuwenden. Dazu gehören: Beobachtung von unter Spannung stehendem Fels (Thema dieser Arbeit). Überwachung von Gesteinsmassen im weitesten Sinn (Dämme, Schüttungen, Gründungen usw.). Überwachung von Durchsickerungen und Injektionen in Fels und Böden. Bestimmung der Geschichte von In-situ-Spannungen von Fels und Böden. Überwachung von Stahlkonstruktionen (Autobahnbrücken und Bohrinseln). Überwachung von Betonbrücken, Talsperren und Gebäuden. Überprüfung des Zustandes von Dauer- oder Kurzzeitankern, Stahlseilen und anderer Teile großer Bauwerke. Während die meisten der angeführten Möglichkeiten noch in irgendeiner Weise in Entwicklung sind, ist ihre Anwendbarkeit gesichert und ein Einsatz in der Praxis in greifbare Nähe gerückt. Diese Arbeit beschreibt die Einsatzmöglichkeiten der genannten Methode zur Beobachtung von Fels und die Entwicklungstendenzen, die derzeit von den Geräteherstellern verfolgt werden.
    Abstract: Résumé Un examen de l'émission acoustique de contrôle des structures rocheuses Obert et Duvall aux États-Unis et Hodgson au Canada on instauré la technique de l'émission acoustique pour contrôler la stabilité des masses rocheuses dans les mines entre 1935 et 1940. Cette technique, qui s'appelait à l'époque le contrôle microséismique (et qui s'appelle ainsi de nos jours), s'étend à bien d'autres domaines que l'industrie minière et s'applique à toutes sortes de problèmes de génie civil, y compris: Le contrôle de toutes sortes d'efforts de masses rocheuses outre les mines (le sujet de cette étude). Le contrôle de diverses masses de terre (barrages, remblais, fondations, etc.). Le contrôle du suintement et l'écoulement de mortier liquide dans la roche et dans la terre. La détermination de l'histoire des efforts de la roche et de la terrein situ. Le contrôle des ponts d'acier qui traverse les grandes routes et des platesformes flottantes pour l'exploration offshore. Le contrôle des ponts, des barrages, et des bâtiments de béton. L'évaluation de la solidité des ancres permanents et provisoires, du câble métallique, et des parties composantes des systèmes structurales plus grandes. Bien que la plupart de ces procédés soient toujours en voie de développement, on a déjà déterminé leur praticabilité; l'exécution de ces procédés se trouve à des étapes différentes. Dans cette étude, on décrit la méthode du contrôle de l'émission acoustique par rapport au contrôle des roches, et les chemins poursuivis actuellement par des fabricants d'équipements. Ensuite, on décrit brièvement les applications de la méthode par rapport au contrôle des structures rocheuses.
    Notes: Summary Overview of Acoustic Emission Monitoring of Rock Structures The acoustic emission technique for monitoring the stability of rock masses in mines was initiated in the late 1930's by Obert and Duvall in the U. S. A. and Hodgson in Canada. The technique, called microseismic monitoring at that time and even to the present, is currently being extended beyond mining into a wide variety of Civil Engineering oriented problems. These include: Monitoring of all types of stressed rock masses in addition to mines (the subject of this paper). Monitoring of a wide variety of soil masses (dams, embankments, foundations, etc.). Monitoring of seepage and grout flow in both rock and soil. Determining in-situ stress history of rock and soil. Monitoring of steel highway bridges and offshore platforms. Monitoring of concrete bridges, dams and buildings. Assessing stability of permanent and temporary anchors, wire rope and other components of larger structural systems. While most of these activities are still in some form of development, they are generally beyond feasibility and are in various stages of implementation. This paper describes the acoustic emission monitoring method as pertains to rock monitoring and some of the directions that equipment manufacturers are currently pursuing. It then briefly describes applications of the method in connection with the monitoring of rock structures.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Removal of winter snow by wind explains why the annual mean oxygen-isotope ratio at an ice divide is 2.5‰ less negative than it is 1.2 km downslope. Cores from two sites on an ice cap, Ellesmere Island, Canada, show past variations in the difference, depending on where the ice originated ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 137-140 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Thermal core samples (Fig. 1) were taken in 1977 with a thermal drill at 1,600 m altitude within 1 km of the top of the Agassiz Ice Cap on northern Ellesmere Island, N.W.T., Canada (81 N 73 W). At this location melting occurs in most summers but affects only 3% of the surface annual layer. Samples ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Isotope measurements on two adjacent cores through the Devon Island ice cap provide a well-dated climatic record for the past 5000 yr. Fluctuations in annual values include much ‘noise’, and ice flow over a rough bed produces distortions in the lowest 5% of core which covers roughly ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 343 (1990), S. 630-631 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A previous study of the Devon Ice Cap (ref. 3, in which the methodology is described) showed that the melt record at the top of the ice cap bears strong relationships to melting over the entire ice cap, to melting on other ice caps and also to late-summer sea-ice conditions in the Queen ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 17 (1881), S. 195-198 
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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