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  • 1
    Publication Date: 2021-03-29
    Description: This dissertation presents a comprehensive description of the stability of asteroid orbits in the Edgeworth-Kuiper belt taking the 3:5, 4:7 and 1:2 mean motion resonance with Neptune as example. Further emphasis is given to the numerical computability of the Lyapunov time of asteroids. Starting with a general description of rounding and approximation errors in numerical computations, the growth of these errors within numerical integrations is estimated. These, partly machine-dependent errors influence the calculated trajectory of the asteroid as well as the derived Lyapunov time. Different hardware architectures and integration methods were used to investigate the influence on the computed Lyapunov time. As a measure of this dependence a computability index ê is defined. Furthermore it is shown, that the general structure of phase space is robust against these changes...
    Description: thesis
    Keywords: 523.44 ; 550 ; TDG 400 ; TGG 900 ; Bahnbestimmung von Himmelskörpern {Astronomie: Himmelsmechanik} ; Planetoide {Astronomie}
    Language: German
    Type: monograph , publishedVersion
    Format: 121 S.
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  • 2
    Publication Date: 2021-03-29
    Description: Sudan as a Sahelian country faced numerous drought periods resulting in famine and mass immigration. Spatial data on dynamics of land use and land cover is scarce and/or almost nonexistent. The study area in the North Kordofan State is located in the centre of Sudan and falls in the Sahelian eco-climatic zone. The region generally yields reasonable harvests of rainfed crops and the grasslands supports plenty of livestock. But any attempts to develop medium- to longterm strategies of sustainable land management have been hampered by the impacts of drought and desertification over a long period of time. This study aims to determine and analyse the dynamics of change of land use/land cover classes...
    Description: thesis
    Keywords: 526.982 ; 550 ; QDB 500 ; Fernerkundung {Geographie}
    Language: English
    Type: monograph , publishedVersion
    Format: 117 S.
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  • 3
    Publication Date: 2021-03-29
    Description: Die vorliegende Arbeit hat zum Ziel, den Einfluss der Rückkopplung zwischen Landoberfläche und Atmosphäre auf den regionalen Wasserhaushalt abzuschätzen. Dazu erfolgen Modellsimulationen mit dem gekoppelten Vegetations-Grenzschichtmodell HIRVAC (HIgh Resolution Vegetation Atmosphere Coupler) für das Einzugsgebiet Sperrgraben (Bayerische Alpen). Im Ergebnis wird der Zusammenhang zwischen dem Entkopplungsfaktor Omega und der Verdunstung als Wasserhaushaltsgröße für einen festgelegten Zeitraum untersucht. Die Kombination eines vertikal hochaufgelösten Grenzschichtmodells (HUB) mit einem mechanistischen Photosynthesemodell (PSN6) im Modell HIRVAC ermöglicht eine detaillierte physikalische Beschreibung der turbulenten Austauschprozesse innerhalb der atmosphärischen Grenzschicht. Gleichzeitig werden die Wechselwirkungen zwischen Vegetation und Atmosphäre für jede Modellschicht innerhalb des Bestandes und zu jedem Modellzeitschritt simuliert...
    Description: thesis
    Keywords: 551.5 ; 550 ; TVL 400 ; TWH 200 ; TVL 400 ; TWH 200 ; Hydrometeorologie ; Einfluss der Topographie {Klimatologie}
    Language: German
    Type: monograph , publishedVersion
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  • 4
    Publication Date: 2021-03-29
    Description: One of the most important recently issues facing Sudan as well as sub-Sahara Africa is the threat of continued land degradation and desertification, as result of climatic factors and human activities. Remote sensing and satellites imageries with temporal and synoptic view play a major role in developing a global and local operational capability for monitoring land degradation and desertification in dry lands as well as in Sudan. The process of desertification in central Sudan, especially in North Kordofan State has increased rapidly, and much effort has been devoted to define and study its causes and impacts. Taking advantages of the future hyperspectral imagery and developing methods such as spectral mixture analysis (SMA) are recently much recommended as most suitable methods for vegetation studies in arid and semiarid areas. Therefore, this study is intending to improve the monitoring capability afforded by remote sensing to analyse and map the desertification processes in North Kordofan by using SMA technique...
    Description: thesis
    Keywords: 551.4 ; 526.982 ; 550 ; VEO 170 ; VBJ 000 ; Sudan {Geologie} ; Satellitenbildgeologie
    Language: English
    Type: monograph , publishedVersion
    Format: 144 S.
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  • 5
    Publication Date: 2021-03-29
    Description: Die neuen Schwerefeld-Satellitenmissionen CHAMP (Challenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment) und GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) können wesentlich zur Erforschung und Beobachtung des Systems Erde beitragen. Die Antarktis als ein Schlüsselglied im globalen Klimasystem bietet dabei besondere Herausforderungen. GRACE hat hier das Potential, zeitliche Massenänderungen (unter anderem der Eismasse) zu beobachten. Methoden zur Auswertung der Missionsdaten befinden sich gegenwärtig in einem intensiven Entwicklungsprozess, zu dem die vorliegende Arbeit beitragen soll. Inhaltlicher Schwerpunkt ist die Nutzung von GRACE zur Ermittlung zeitlicher Massenvariationen in der Antarktis...
    Description: thesis
    Keywords: 526.7 ; 551.31 ; 550 ; TQA 000 ; TSY 200 ; Gravimetrische Verfahren {Geophysik} ; Antarktis {Geophysik} ; Satelliten-Geophysik
    Language: German
    Type: monograph , publishedVersion
    Format: 141 S.
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  • 6
    Publication Date: 2021-03-29
    Description: Die gestiegene Messgenauigkeit der Erdrotationsparameter ermöglicht inzwischen eine Berücksichtigung von Sekundäreffekten, wie Einflüssen hydrologischer Massenvariationen. Variationen der Erdrotation durch hydrologische Massenvariationen sind bisher weniger gut als atmosphärische und ozeanische Beiträge erforscht. Zur Interpretation, Analyse und Zuordnung von Signalen in den Erdrotationsparamtern wurden mit einem Landoberflächenschema und einem lateralen Abflussmodell langjährige hydrologische Simulationen unter Antrieb aus verschiedenen globalen ...
    Description: thesis
    Keywords: 551.4 ; 525.35 ; 550 ; TOW 000 ; TOB 100 ; Fluiddynamik {Geophysik} ; Drehbewegungen {Geophysik: Erde}
    Language: German
    Type: monograph , publishedVersion
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