E-Dissertationen: Browsing E-Dissertationen by Title
Now showing items 2879-2898 of 4163
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Photoproduktion neutraler Pionpaare mit dem Crystal–Barrel–Detektor an ELSA
Fuchs, Michael (2005)Im Rahmen dieser Arbeit wurde die Photoproduktion von zwei neutralen Pionen am Proton mit dem Crystal-Barrel-Detektor am Elektronenbeschleuniger (ELSA) in Bonn untersucht. Die aus dem Beschleuniger extrahierten Elektronen ... -
Photoproduktion von π0ω am Proton bei Energien bis zu 3 GeV: Messungen mit dem Crystal-Barrel-Detektor an ELSA
Junkersfeld, Jörg (2006)Die CB-ELSA Kollaboration hat in 2001 Daten zur Photoproduktion von Mesonen an einem Wasserstofftarget genommen. Die Elektronenbeschleunigeranlage ELSA wurde auf eine Energie von 3.2 GeV eingestellt und mittels eines ... -
Photoproduktion von ω Mesonen am Proton bei CB-ELSA: Untersuchung der Reaktion γp→pω bei Photonenergien von 1.1 bis 3 GeV
Lotz, Johannes (2006)In der vorliegenden Arbei wird die Photoproduktion von Omega-Mesonen am Proton untersucht. Die Daten sind am Crystal Barrel Experiment am Bonner Elektornenbeschleuniger ELSA bei einer Primärenergie von 3.2 GeV genommen ... -
Photoproduktion γ p -> π0π0 Ergebnisse und Entwicklung einer schnellen FADC-Auslese für Doppelpolarisationsexperimente
Szczepanek, Torge (2006)Der Crystal-Barrel-Detektor ist ein am Bonner Elektronenbeschleuniger ELSA installiertes Detektorsystem zur Untersuchung von Baryonresonanzen mittels Photoproduktions-Experimenten. Mit einem abgedeckten Raumwinkelbereich ... -
Die Phyllosphäre als Lebensraum für Bakterien: Mechanismen der Interaktion epiphyller Bakterien mit der pflanzlichen Kutikula
Linnemann, Thomas Vitus (2020-12-16)Die Phyllosphäre stellt einen lebensfeindlichen Lebensraum dar. Jedoch gibt es epiphytisch lebende Bakterien, die diesen Lebensumständen entgegenwirken und Mechanismen entwickelt haben, in diesem kargen Lebensraum Nährstoffe ... -
Phylogenetische und funktionsmorphologische Untersuchungen der Ohrregion bei Sciuromorpha (Rodentia, Mammalia)
Schwarz, Cathrin (2012-08-31)Die Auris media der Rodentia zeichnet sich durch knöcherne Septen innerhalb des Recessus epitympanicus und des Cavum tympani aus. Diese können mit der 'Septenuhr' und der 'Septengleichung', welche in dieser Studie entwickelt ... -
Phylogeny and evolution of Adephaga and Neuropterida (Insecta: Holometabola) as inferred from analyses of next-generation sequencing data
Vasilikopoulos, Alexandros (2021-09-17)Knowing the evolutionary relationships of species is fundamental for comparative studies in biology as well as for biodiversity conservation. The main topic of this thesis is the investigation of phylogenetic relationships ... -
Phylogeny and evolution of the epiphytic Rhipsalideae (Cactaceae)
Korotkova, Nadja (2012-01-11)Cactaceae are one of the major floristic components of the New World’s arid as well as seasonally moist tropical regions and at the same time one of the most popular plant families in horticulture. The taxonomic units ... -
Phylogeny of Echiura (Annelida, Polychaeta) inferred from morphological and molecular data-implications for character evolution
Lehrke, Janina (2012-09-14)Contrary to echiuran monophyly, which is unambiguously supported by several autapomorphies, echiuran phylogenetic intra-relationships are still unknown to date. In order to contribute to a clarification this thesis ... -
Phylogeny, Biogeography and Systematics of Loasaceae subfam. Loasoideae
Acuña Castillo, Rafael (2019-02-01)Loasaceae subfam. Loasoideae is a mostly South American group of angiosperms that reaches its highest diversity in the Andean mountain ranges but also extends into Central America, Africa and Oceania. Although some molecular ... -
Phylogeography of the Komodo monitor Varanus komodoensis (Reptilia: Varanidae) inferred from mitochondrial DNA Control Region I and the implications for in situ management plans
Arida, Evy Ayu (2011-03-16)The Komodo monitor (<i>Varanus</i> <i>komodoensis</i>) is the largest living lizard in the world, which was discovered by scientists only about one hundred years ago. The wild populations of the Komodo monitor are restricted ... -
The physical and chemical conditions of molecular clouds on large scales
Brinkmann, Nina (2021-09-15)Observations of molecular emission lines in the radio and (sub)millimetre wavelength regime provide insights into the interiors of molecular clouds which are inaccessible by other forms of radiation. Examining the physical ... -
Physical and Chemical Properties of Protocluster Clumps and Massive Young Stellar Objects Associated to Infrared Dark Clouds
Gómez González, Laura (2012-08-10)The study of high-mass stars is important not only because of the effects they produce in their environment through outflows, expanding HII regions, stellar winds, and eventually supernova shock waves, but also because ... -
Physical Initialisation of Precipitation in a Mesoscale Numerical Weather Forecast Model
Milan, Marco (2010-03-03)Short term quantitative precipitation forecast (QPF) is an important task for numerical weather prediction (NWP) models, particularly in summer. The increase of model resolution requires the understanding of the initiation ... -
Physical processes behind the periodic radio and gamma-ray emission from the X-ray binary LS I +61°303
Jaron, Frédéric Felix Daniel (2016-07-21)X-ray binaries are binary stars composed of a normal star and a compact object which, via Roche-lobe overflow or wind accretion, accretes matter from the companion. X-ray emission from these objects can be either thermal ... -
The Physical Properties of Intermediate-Velocity Gas at High Galactic Latitudes
Röhser, Tobias (2016-07-26)The accretion of matter onto galactic disks, the formation of molecular clouds, and the formation of stars are of major importance for the evolution of galaxies over cosmic times. During their lifetimes, high-mass stars ... -
Physically Based Modeling of Micro-Appearance
Huang, Weizhen (2023-07-11)This dissertation addresses the challenges of creating photorealistic images by focusing on generating and rendering microscale details and irregularities, because a lack of such imperfections is usually the key aspect of ... -
Physicochemical Analysis of Bacterial and Firefly Bioluminescence
Kammler, Lydia (2013-10-17)The light emitting reaction of bioluminescence is one of the most visible processes in nature. The present work provides new significant information about the bioluminescent reaction in bacteria. A radical intermediate ... -
The Physics and Chemistry of Oxygen-rich Circumstellar Envelopes as Traced by Simple Molecules
Wong, Ka Tat (2018-04-17)The physics and chemistry of the circumstellar envelopes (CSEs) of evolved stars are not fully understood despite decades of research. This thesis addresses two issues in the study of the CSEs of oxygen-rich (O-rich) evolved ... -
Physikochemische und biochemische Mechanismen in der Plasmamembran zur Kontrolle des Clusterverhaltens des T-Zell-Rezeptors
van Üüm, Jan Niklas (2014-02-26)Die Plasmamembran als Vermittlerin zwischen Zellinnerem und umgebender Umwelt ist eine wichtige Struktur der Zelle, deren Organisationsprinzipien nur ansatzweise verstanden sind. Membranproteine erfüllen essentielle Aufgaben ...