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  • American Chemical Society (ACS)  (66,957)
  • PANGAEA  (49,174)
  • Blackwell Publishing Ltd
  • 2015-2019  (115,449)
  • 1975-1979  (16,257)
  • 1950-1954  (2,522)
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  • 1
  • 2
    Publication Date: 2022-11-29
    Description: Lake Towuti is a tectonic basin, surrounded by ultramafic rocks. Lateritic soils form through weathering and deliver abundant iron (oxy)hydroxides but very little sulfate to the lake and its sediment. To characterize the sediment biogeochemistry, we collected cores at three sites with increasing water depth and decreasing bottom water oxygen concentrations. Microbial cell densities were highest at the shallow site - a feature we attribute to the availability of labile organic matter and the higher abundance of electron acceptors due to oxic bottom water conditions. At the two other sites, OM degradation and reduction processes below the oxycline led to partial electron acceptor depletion. Genetic information preserved in the sediment as extracellular DNA provides information on aerobic and anaerobic heterotrophs related to Actinobacteria, Nitrospirae, Chloroflexi and Thermoplasmatales. These taxa apparently played a significant role in the degradation of sinking organic matter. However, extracellular DNA concentrations rapidly decrease with core depth. Despite very low sulfate concentrations, sulfate-reducing bacteria were present and viable in sediments at all three sites, as confirmed by measurement of potential sulfate reduction rates. Microbial community fingerprinting supported the presence of taxa related to Deltaproteobacteria and Firmicutes with demonstrated capacity for iron and sulfate reduction. Concomitantly, sequences of Ruminococcaceae, Clostridiales and Methanomicrobiales indicated potential for fermentative hydrogen and methane production. Such first insights into ferruginous sediments show that microbial populations perform successive metabolisms related to sulfur, iron and methane. In theory, iron reduction could reoxidize reduced sulfur compounds and desorb OM from iron minerals to allow remineralization to methane. Overall, we found that biogeochemical processes in the sediments can be linked to redox differences in the bottom waters of the three sites, like oxidant concentrations and the supply of labile OM. At the scale of the lacustrine record, our geomicrobiological study should provide a means to link the extant subsurface biosphere to past environments.
    Type: info:eu-repo/semantics/workingPaper
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  • 3
    Publication Date: 2022-11-29
    Description: Pore water geochemistry and bulk sediment measurements of downcore profiles covering the upper 100 m-long sequence from site 1A, Lake Towuti, Indonesia
    Type: info:eu-repo/semantics/workingPaper
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  • 4
    Publication Date: 2020-02-12
    Description: The airborne laser scanning (ALS) datasets were acquired at the Arctic tundra site of Trail Valley Creek (TVC), Northwest Territories, Canada, which is underlain by continuous permafrost. Basic processing and filtering steps were applied to the ALS point cloud. Based on a classification into ground and vegetation points, a Digital Terrain Model (DTM) and rasters of mean and maximum vegetation heights are derived. Detailed metadata are included.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 5
    Publication Date: 2020-02-12
    Description: A major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry, and to a lesser extent satellite altimetry, is the poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA). In the past decade, much progress has been made in consistently modelling the ice sheet and solid Earth interactions; however, forward-modelling solutions of GIA in Antarctica remain uncertain due to the sparsity of constraints on the ice sheet evolution, as well as the Earth's rheological properties. An alternative approach towards estimating GIA is the joint inversion of multiple satellite data - namely, satellite gravimetry, satellite altimetry and GPS, which reflect, with different sensitivities, trends of recent glacial changes and GIA. Crucial to the success of this approach is the accuracy of the space-geodetic data sets. Here, we present reprocessed rates of surface-ice elevation change (Envisat/ICESat; 2003-2009), gravity field change (GRACE; 2003-2009) and bedrock uplift (GPS; 1995-2013). The data analysis is complemented by the forward-modelling of viscoelastic response functions to disc load forcing, allowing us to relate GIA-induced surface displacements with gravity changes for different rheological parameters of the solid Earth. The data and modelling results presented here form the basis for the joint inversion estimate of present-day ice-mass change and GIA in Antarctica. This paper presents the first of two contributions summarizing the work carried out within a European Space Agency funded study, REGINA.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 9 (1979), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The development of the Analytical Photogrammetry Compiler (APC) is traced and a detailed description is given of the component parts of the AP/C-4.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméOn retrace le developpement du restituteur analytique (APC) et on donne une description detaillée des composants du AP/C-4.〈section xml:id="abs1-3"〉〈title type="main"〉Zusammenfassung Skizzierung des Analytical Photogrammetry Compiler (APC) und detaillierte Beschreibung der Hauptbaugruppen der AP/C-4.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 9 (1979), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The fifth biennial symposium of the Photogrammetric Society was held at the University of Birmingham on 6th to 8th April. It has been decided to perpetuate the memory of E. H. Thompson by giving his name to the series of symposia which originated at Birmingham in 1971 Eight papers were delivered to the 1979 symposium. They covered a wide variety of topics which included, in addition to a review of Thompson's own contribution to analytical photogrammetry, a modern approach to the handling of parallax measurements; aspects of digitising; low cost automatic contouring; high energy roentgen photogrammetry; applications in anatomy; the photogrammetric operator's point of view; and cadastral surveys. The majority of the papers are published in this issue of The Photogrammetric Record.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméLe cinquième symposium biennal de la Société de Photogrammétrie s'est dérouléà l'université de Birmingham du 6 au 8 Avril. On décida de perpétuer le souvenir de E. H. Thompson en donnant son nom à la série de symposiums inaugurée à Birmingham en 1971 Huit communications ont été présentées au symposium de 1979. Elles concernaient une grande diversité de sujets qui comprenaient, en plus d'une revue de la contribution de Thompson à la photogrammétrie analytique, une methode moderne de mesure de parallaxe; des aspects de la transformation digitale; une visée automatique à bas prix; la photogrammétrie Roentgen à grande energie; des applications en anatomie; le point de vue de l'opérateur en photogrammétrie; et des cadastres. La majorité des communications sont publicées dans ce numéro de The Photogrammetric Record.〈section xml:id="abs1-3"〉〈title type="main"〉Zusammenfassung Das 5. im Abstand von zwei Jahren von der Photogrammetric Society veranstaltete Symposium fand vom 6. bis 8. April an der Universität Birmingham statt. Es wurde beschlossen, in ehrendem Gedenken Prof. Thompsons seinen Namen dieser Serie von Symposien, die 1971 in Birmingham begonnen hat, zu geben.Auf dem Symposium 1979 wurden 8 Vorträge gehalten. Sie beinhalten ein breites Themenspektrum, darunter ergänzend zu einem äberblick über den Beitrag Thompsons zur analytischen Photogrammetrie, eine moderne Lösung zur Verarbeitung von Parallaxenmessungen, Aspekte der Digital-isierung, eine kostengünstige automatische Höhenlinienentwicklung, Röntgen-photogrammetrie, Anwendungen in der Anatomie, der Standpunkt des photogrammetrischen Auswerters und Katastermessungen. Die Mehrzahl der Beiträge wird in dieser Ausgabe des Photogrammetric Record veröffentlicht.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 9 (1979), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: As part of his comprehensive analysis of cadastral surveys within the British Commonwealth (Dale, 1976), the author considered the contribution of aerial photography and photogrammetric surveys to this aspect of land administration. In this paper, he examines that contribution and underlines the limitations of photogrammetry as a cadastral survey method.〈section xml:id="abs1-2"〉〈title type="main"〉Résumé L'auteur extrait de l'étude exhaustive qu'il a faite du levé cadastral dans le Commonwealth (Dale, 1976) tout ce qui a rapport à la photogrammétrie: contribution et limitations.〈section xml:id="abs1-3"〉〈title type="main"〉ZusammenfassungIn seiner umfassenden Analyse von Katastermessungen (Dale, 1976) betrachtete der Autor den Beitrag der Aerophotogrammetrie und photo-grammetrischer Messungen für die Landeinrichtung. In der vorliegenden Arbeit werden diese Ausführungen überpruft und in diesem Zusammenhang die Grenzen der Photogrammetrie herausgearbeitet.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 9 (1979), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A simple method is described for calibrating cameras at object distances of less than 0·5 m.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméOn décrit une méthode simple pour calibrer les appareils de photographie pour des objets à des distances de moins de 0·5 m.〈section xml:id="abs1-3"〉〈title type="main"〉ZusammenfassungBeschreibung eines einfachen Verfahrens zur Kammerkalibrierung für Aufnahmeentfernungen von weniger als 0·5 m.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 9 (1979), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Book Reviewed in this article:CHARTERED LAND SURVEYOR/CHARTERED MINERALS SURVEYOR, Volume 1, Number 1, Spring 1979. Edited by M. Hanson.STUDENT MAP PACK. Dissected highland area: Maesteg, South Wales (Educational Map Series No. 10A). Industrial area: Washington New Town (Educational Map Series No. 11A).PHOTOGRAPHIC TECHNIQUES IN SCIENTIFIC RESEARCH, Volume 3. Edited by A. A. Newman.THE CAMERA AT WAR. By J. Lewinski.RECOGNITION OF TREE SPECIES ON AERIAL PHOTOGRAPHS. By L. Sayn-Wittgenstein.
    Type of Medium: Electronic Resource
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