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  • English  (2,628)
  • 2005-2009  (2,628)
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  • 1
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Oxford University Press
    Type of Medium: Monograph available for loan
    Pages: XIV, 354 S , Ill., graph. Darst., Kt.
    ISBN: 0195154312 , 9780195154313
    Series Statement: Long-Term Ecological Research Network series
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Publication Date: 2024-04-19
    Description: This paper reports on the results of an independent evaluation of the techniques presented in the VLDB 2007 paper "Scalable Semantic Web Data Management Using Vertical Partitioning", authored by D. Abadi, A. Marcus, S. R. Madden, and K. Hollenbach [1]. We revisit the proposed benchmark and examine both the data and query space coverage. The benchmark is extended to cover a larger portion of the query space in a canonical way. Repeatability of the experiments is assessed using the code base obtained from the authors. Inspired by the proposed vertically-partitioned storage solution for RDF data and the performance figures using a column-store, we conduct a complementary analysis of state-of-the-art RDF storage solutions. To this end, we employ MonetDB/SQL, a fully-functional open source column-store, and a well-known -- for its performance -- commercial row-store DBMS. We implement two relational RDF storage solutions -- triple-store and vertically-partitioned -- in both systems. This allows us to expand the scope of [1] with the performance characterization along both dimensions -- triple-store vs. vertically-partitioned and row-store vs. column-store -- individually, before analyzing their combined effects. A detailed report of the experimental test-bed, as well as an in-depth analysis of the parameters involved, clarify the scope of the solution originally presented and position the results in a broader context by covering more systems.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 3
    Publication Date: 2024-04-19
    Description: By leveraging modern networking hardware (RDMA-enabled network cards), we can shift priorities in distributed database processing significantly. Complex and sophisticated mechanisms to avoid network traffic can be replaced by a scheme that takes advantage of the bandwidth and low latency offered by such interconnects. We illustrate this phenomenon with cyclo-join, an efficient join algorithm based on continuously pumping data through a ring-structured network. Our approach is capable of exploiting the resources of all CPUs and distributed main-memory available in the network for processing queries of arbitrary shape and datasets of arbitrary size.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
    Publication Date: 2024-04-19
    Description: This paper presents our experiences in porting the Sloan Digital Sky Survey(SDSS)/ SkyServer to the state-of- the-art open source database system MonetDB/SQL. SDSS acts as a well-documented benchmark for scientific database management. We have achieved a fully functional prototype for the personal SkyServer, to be downloaded from our site. The lessons learned are 1) the column store approach of MonetDB demonstrates a great potential in the world of scientific databases. However, the application also challenged the functionality of our implementation and revealed that a fully operational SQL environment is needed, e.g. including persistent stored modules; 2) the initial performance is competitive to the reference platform, MS SQL Server 2005, and 3) the analysis of SDSS query traces hints at several techniques to boost performance by utilizing repetitive behavior and zoom-in/zoom-out access patterns, that are currently not captured by the system.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
    Publication Date: 2024-04-19
    Description: Stream applications gained significant popularity over the last years that lead to the development of specialized stream engines. These systems are designed from scratch with a different philosophy than nowadays database engines in order to cope with the stream applications requirements. However, this means that they lack the power and sophisticated techniques of a full fledged database system that exploits techniques and algorithms accumulated over many years of database research. In this paper, we take the opposite route and design a stream engine directly on top of a database kernel. Incoming tuples are directly stored upon arrival in a new kind of system tables, called baskets. A continuous query can then be evaluated over its relevant baskets as a typical one-time query exploiting the power of the relational engine. Once a tuple has been seen by all relevant queries/operators, it is dropped from its basket. A basket can be the input to a single or multiple similar query plans. Furthermore, a query plan can be split into multiple parts each one with its own input/output baskets allowing for flexible load sharing query scheduling. Contrary to traditional stream engines, that process one tuple at a time, this model allows batch processing of tuples, e.g., query a basket only after x tuples arrive or after a time threshold has passed. Furthermore, we are not restricted to process tuples in the order they arrive. Instead, we can selectively pick tuples from a basket based on the query requirements exploiting a novel query component, the basket expressions. We investigate the opportunities and challenges that arise with such a direction and we show that it carries significant advantages. We propose a complete architecture, the DataCell, which we implemented on top of an open-source column-oriented DBMS. A detailed analysis and experimental evaluation of the core algorithms using both micro benchmarks and the standard Linear Road benchmark demonstrate the potential of this new approach.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
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    Boca Raton, FL : CRC Press
    Call number: 9781420073072 (e-book)
    Description / Table of Contents: As we discover more about the role of the ocean in global changes and identify the effects of global change on the ocean, understanding its chemical composition and processes becomes increasingly paramount. However, understanding these processes requires a wide range of measurements in the vast ocean, from the sea surface to deep-ocean trenches, from the tropics to the poles. Practical Guidelines for the Analysis of Seawater provides a common analytical basis for generating quality-assured and reliable data on chemical parameters in the ocean. A source of practical know-how, the book covers sampling and storage, analytical methodology, and guidelines and procedures for quality assurance. It presents analytical methods with the step-by-step procedures that help practitioners implement these methods successfully into the laboratory, making them instantly applicable without consulting further literature. The book also contains essential information for developing or improving quality control and quality assurance programs in the laboratory. It includes the availability and measurement of standard reference materials, blank estimation and correction, control of recoveries, and statistical evaluation of quality assurance data. Analytical chemistry is a very active and fast moving area. Despite the development of innovative new analytical techniques for chemical trace element research, obtaining reliable data at ultra-trace levels remains a formidable challenge. A complete and practical guide, this book delineates proven methods that consistently yield reproducible data in routine work.
    Type of Medium: 12
    Pages: 1 Online-Ressource (xii, 401 Seiten) , Illustrationen, Diagramme
    ISBN: 978-1-4200-7307-2 , 9781420073072
    Series Statement: Environmental science and technology
    Language: English
    Note: Contents Preface Editor Contributors Chapter 1 Sampling and Sample Treatments / Oliver Wurl Chapter 2 Analysis of Dissolved and Particulate Organic Carbon with the HTCO Technique / Oliver Wurl and Tsai Min Sin Chapter 3 Spectrophotometric and Chromatographic Analysis of Carbohydrates in Marine Samples / Christos Panagiotopoulos and Oliver Wurl Chapter 4 The Analysis of Amino Acids in Seawater / Thorsten Dittmar, Jennifer Cherrier, and Kai-Uwe Ludwichowski Chapter 5 Optical Analysis of Chromophoric Dissolved Organic Matter / Norman B. Nelson and Paula G. Coble Chapter 6 Isotope Composition of Organic Matter in Seawater / Laodong Guo and Ming-Yi Sun Chapter 7 Determination of Marine Gel Particles / Anja Engel Chapter 8 Nutrients in Seawater Using Segmented Flow Analysis / Alain Aminot, Roger Kérouel, and Stephen C. Coverly Chapter 9 Dissolved Organic and Particulate Nitrogen and Phosphorous / Gerhard Kattner Chapter 10 Pigment Applications in Aquatic Systems / Karen Helen Wiltshire Chapter 11 Determination of DMS, DMSP, and DMSO in Seawater / Jacqueline Stefels Chapter 12 Determination of Iron in Seawater / Andrew R. Bowie and Maeve C. Lohan Chapter 13 Radionuclide Analysis in Seawater / Mark Baskaran, Gi-Hoon Hong, and Peter H. Santschi Chapter 14 Sampling and Measurements of Trace Metals in Seawater / Sylvia G. Sander, Keith Hunter, and Russell Frew Chapter 15 Trace Analysis of Selected Persistent Organic Pollutants in Seawater / Oliver Wurl Chapter 16 Pharmaceutical Compounds in Estuarine and Coastal Waters / John L. Zhou and Zulin Zhang Appendix A: First Aid for Common Problems with Typical Analytical Instruments Appendix B: Chemical Compatibilities and Physical Properties of Various Materials Appendix C: Water Purification Technologies
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  • 7
    Publication Date: 2024-02-28
    Description: Dieser Artikel diskutiert den Charakter von Pollentypen. Wir argumentieren, dass Pollentypen und Pflanzentaxa komplett unterschiedliche Entitäten (morphologische bzw. taxonomische) sind, und deswegen unterschiedlich behandelt und dargestellt werden sollten. Allgemeine Probleme der konventionellen Nomenklatur von Pollentypen werden anhand von Beispielen aus der europäischen palynologischen Praxis illustriert. Wir plädieren für Deutlichkeit in der Nomenklatur von Pollentypen und für die wissenschaftliche Freiheit, ‘unkonventionelle‘ Methoden zu benutzen, um Verwirrung zu vermeiden.
    Description: research
    Keywords: ddc:551.7 ; palynological methods ; pollen morphology ; pollen type nomenclature
    Language: English
    Type: doc-type:article , publishedVersion
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  • 8
    Publication Date: 2024-02-28
    Description: Landslide activity often significantly alters the spectral signal of the earth surface through the displacement and disruption of the surficial vegetation layer. This makes landslide areas targets for detection and mapping from spaceborne data. We employed data from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) to detect and map landslides that were triggered by the 2005 Kashmir earthquake. Digital Elevation Models (DEMs) generated from ASTER stereo data, together with DEM data from the Shuttle Radar Topography Mission (SRTM) were used to calculate volume estimates for individual landslides. Orthophotos and DEMs were generated from corrected level 1B data. Orientation of the 3N and corresponding 3B band from GCPs, transformation to epipolar geometry, parallax-matching, and parallax-to-DEM conversion was done using the PCI Geomatica 10.1 Orthoengine software. Orthophotos and DEMs were then integrated into a GIS (ArcGIS 9.2), where landslides were automatically detected and mapped using different band thresholds, band ratios, change detection methods and selected terrain information. The resulting landslides inventory data was used to supplement and extend an existing field data inventory.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 9
    Call number: AWI A2-24-95687
    Type of Medium: Monograph available for loan
    Pages: 97 Seiten , Illustrationen
    Edition: 2nd edition
    ISBN: 9782880853051 , 978-2-940443-00-0
    Language: English
    Note: Contents Executive summary Overview Arctic climate change Key findings of this assessment 1. Atmospheric circulation feedbacks 2. Ocean circulation feedbacks 3. Ice sheets and sea-level rise feedbacks 4. Marine carbon cycle feedbacks 5. Land carbon cycle feedbacks 6. Methane hydrate feedbacks Author team
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 10
    Monograph available for loan
    Monograph available for loan
    Cambridge : Cambridge University Press
    Call number: PIK 24-95567
    Type of Medium: Monograph available for loan
    Pages: XVI, 558 S , graph. Darst
    Edition: Repr.
    ISBN: 0521588707 , 9780521588706 , 9780521380430
    Language: English
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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