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  • 2020-2024  (167,318)
  • 1980-1984  (1,016,483)
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  • 1
    Publication Date: 2024-06-25
    Description: Meeresschutz in nächster Nähe: Ein Pilotprojekt soll Schulklassen für ihre Umwelt sensibilisieren
    Type: Newspaper report , NonPeerReviewed
    Format: text
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  • 2
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    Publication Date: 2024-06-25
    Description: Forscher von Geomar untersuchen Weltkriegsmunition in der Ostsee - Sie ist vielfältiger als gedacht
    Type: Newspaper report , NonPeerReviewed
    Format: text
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  • 3
    Publication Date: 2024-06-25
    Description: Underwater vision systems have become popular in ocean research. However, imaging in the deep sea poses significant challenges. Firstly, cameras enclosed in waterproof housings must withstand extreme water pressure, while light undergoes refraction as it traverses multiple media layers. Secondly, light absorption and scattering in water degrade image quality. Additionally, artificial illumination in the deep sea creates unique visual effects. All these factors collectively contribute to the complexity and difficulty of visual 3D reconstruction in the deep sea. This dissertation provides comprehensive solutions to the challenges encountered in deep sea visual 3D reconstruction, encompassing both hardware and software components. To address geometric refraction effects, it thoroughly analyzes dome refractive geometry and proposes mechanical adjustments for centering cameras inside domes to mitigate refraction effects. Additionally, recognizing the wide use of flat port interfaces, the dissertation explores effective methods to correct flat refraction effects for underwater photogrammetry. Furthermore, the dissertation delves into radiometric issues arising from light absorption and scattering in water, especially concerning artificial illumination in deep-sea imaging. It explores physical models of underwater image formation and develops a general model suitable for restoring various types of underwater image, especially in environments with complex artificial illumination. This model enables the simultaneous removal of artificial lighting patterns and the restoration of true colors. Moreover, the dissertation demonstrates several successful applications of the techniques developed within its scope. It showcases their efficacy in various camera system designs, underwater 3D reconstruction, and improving complex illumination configurations within imaging systems.
    Type: Thesis , NonPeerReviewed
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  • 4
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    GEOMAR
    Publication Date: 2024-06-25
    Description: FS Maria S Merian – MSM129/2 07.06.2024 – 06.07.2024 St. John’s (Kanada) – Reykjavik (Island) 3. Wochenbericht (17.06. – 23.06.2024)
    Type: Report , NonPeerReviewed
    Format: text
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  • 5
    Publication Date: 2024-06-25
    Keywords: ddc:300
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: bookpart , doc-type:bookPart
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  • 6
    Publication Date: 2024-06-25
    Keywords: ddc:300
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: report , doc-type:report
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  • 7
    Publication Date: 2024-06-25
    Description: Der Abschlussbericht beschreibt den von den Autoren wissenschaftlich betreuten Strategieprozess zur Implementierung und Fortschreibung des Deutschen Ressourceneffizienzprogramms ProgRess während der Projektlaufzeit. Wesentliche Prozesselemente sind ⁠Monitoring⁠ und Evaluation des Programms, die Einbindung von Stakeholdern aus Forschung, Wirtschaft, Politik und Zivilgesellschaft mit Hilfe der NaRess-Plattform und ihrer Arbeitsgruppen sowie die Erstellung zahlreicher Vertiefungsanalysen und Positionspapiere zu aktuellen Themen der Ressourcenpolitik. Die Publikation richtet sich an Entscheidungsträger aus allen Verwaltungsebenen, die ein laufendes Ressourceneffizienzprogramm oder eine vergleichbare rohstoffbezogene Strategie auf den Weg bringen oder begleiten.
    Keywords: ddc:300
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: report , doc-type:report
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  • 8
    Publication Date: 2024-06-25
    Description: Dieser Bericht befasst sich mit dem ⁠Monitoring⁠ und der Evaluation von ProgRess III. Der Bericht geht über die Analyse der Ressourceneffizienz auf volkswirtschaftlicher Ebene hinaus und evaluiert insbesondere die Umsetzung der Maßnahmen, die mit ihnen verbundenen Effekte und die zugrundeliegenden Erfolgsfaktoren. Dazu wurde ein zweistufiges Verfahren durchgeführt: ein Monitoring und eine Evaluation des Programms. Nach einer Einführung in die Ziele der Evaluation und der Abgrenzung zum zuvor durchgeführten Monitoring (Kap. 1) werden die Forschungsfragen und die Elemente eines erfolgreichen Politikmix, wie er in der theoretischen Forschung diskutiert und konzipiert wird, kurz erörtert (Kap. 2). Dann werden die Methoden (Analyse, Interviews, Webcrawling) und der Fahrplan der Evaluation vorgestellt (Kap. 3). Zwei Wirkungsmodelle, ein materielles und ein organisationales ⁠Wirkmodell⁠, bilden die Basis für die verschiedenen Betrachtungsebenen und Foki, die für die Evaluation gewählt wurden. In Kapitel 4 werden schließlich die Erkenntnisse, die durch den Einsatz der verschiedenen Methoden gewonnen wurden, in bewusst kompakter und übersichtlicher Form in Bezug zu den Evaluationskriterien dargestellt und Empfehlungen abgeleitet. Kapitel 5 widmet sich der Gesamtbewertung der Effektivität von ProgRess III und Kapitel 6 bearbeitet abschließend die Frage, welche Entwicklungspotenziale aus den gewonnenen Erkenntnissen abgeleitet werden können.
    Keywords: ddc:320
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: report , doc-type:report
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  • 9
    Publication Date: 2024-06-25
    Description: The yearly Wokshop is forum for data science research, developments and support services. The agenda is published regularly online.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Other , notRev
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  • 10
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    Copernicus Publications
    In:  EPIC3Geoscientific Model Development, Copernicus Publications, 17(10), pp. 4433-4445, ISSN: 1991-959X
    Publication Date: 2024-06-25
    Description: Data assimilation is a common technique employed to estimate the state and its associated uncertainties in numerical models. Ensemble-based methods are a prevalent choice, although they can be computationally expensive due to the required ensemble integrations. In this study, we enhance the capabilities of the Weather Research and Forecasting-Advanced Research WRF (WRF-ARW) model by coupling it with the Parallel Data Assimilation Framework (PDAF) in a fully online mode. Through minimal modifications to the WRF-ARW model code, we have developed an efficient data assimilation system. This system leverages parallelization and in-memory data transfers between the model and data assimilation processes, greatly reducing the need for file I/O and model restarts during assimilation. We detail the necessary program modifications in this study. One advantage of the resulting assimilation system is a clear separation of concerns between data assimilation method development and model application resulting from PDAF's model-Agnostic structure. To evaluate the assimilation system, we conduct a twin experiment simulating an idealized tropical cyclone. Cycled data assimilation experiments focus on the impact of temperature profiles. The assimilation not only significantly enhances temperature field accuracy but also improves the initial U and V fields. The assimilation process introduces only minimal overhead in runtime when compared to the model without data assimilation and exhibits excellent parallel performance. Consequently, the online WRF-PDAF system emerges as an efficient framework for implementing high-resolution mesoscale forecasting and reanalysis.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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