An der Schnittstelle von Text und Bild: Untersuchungen zu Arthur Rackhams Illustrationen zu Richard Wagners Der Ring des Nibelungen

In Auseinandersetzung mit Arthur Rackhams Illustrationszyklus zu Richard Wagners RING DES NIBELUNGEN widmet sich die Arbeit einem transdisziplinären Ansatz folgend der Text-Bild-Beziehung. Die bedingt von der Gattung des Ausgangstexts gewählte Vergleichsgrundlage ist „Handlung“. Als Dramentext ist dieser zunächst eine nahezu reine Beschreibung eines Handlungsverlaufs, wobei neben der Bühnenhandlung ebenso setting und histoire vermittelt werden. Der Text vermittelt einen Handlungsfluss, das jeweilige Bild hingegen einen Handlungsmoment. Die Sichtung und Beschreibung der Illustrationen erfolgt im Hinblick auf den dargestellten Handlungsmoment. Mithin stellt sich die Frage, wie und mit welchem Ergebnis der Illustrator als Blick-lenkende, quasi interpretierende Instanz arbeitet. Neben den so sicht- und nachvollziehbar werdenden Anknüpfungspunkten der Illustrationen zum Ausgangstext wird auch Rackhams Selbstbewusstsein als Illustrator gegenüber dem Autor Wagner deutlich

The Effect of Bonding on the Fragmentation of Small Systems

Recent dissociative recombination (DR) experiments have reported that the observed reaction products depend on the structure, bonding, and charge centre of the molecular ion. For examples, the dominant product channel observed in the DR of D5(+)(2), N2O2(+)(1), and D5O2(+)(3) suggests that the former two ions have the form D3(+) D2, and NO(+) NO(1), respectively, whilst the latter is known to have the form D2O D(+) D2O (3). Here we compare and contrast these observations by investigating the DR of one of the simplest such systems, Li(+) H2. This system, a weakly bound cluster with the charge centre located on the lithium atom, will provide us with an excellent opportunity for investigating the role played by the type of bonds and charge centre in the DR process

Enhanced cosmic-ray flux toward zeta Persei inferred from laboratory study of H3+ - e- recombination rate

The H3+ molecular ion plays a fundamental role in interstellar chemistry, as it initiates a network of chemical reactions that produce many interstellar molecules. In dense clouds, the H3+ abundance is understood using a simple chemical model, from which observations of H3+ yield valuable estimates of cloud path length, density, and temperature. On the other hand, observations of diffuse clouds have suggested that H3+ is considerably more abundant than expected from the chemical models. However, diffuse cloud models have been hampered by the uncertain values of three key parameters: the rate of H3+ destruction by electrons, the electron fraction, and the cosmic-ray ionisation rate. Here we report a direct experimental measurement of the H3+ destruction rate under nearly interstellar conditions. We also report the observation of H3+ in a diffuse cloud (towards zeta Persei) where the electron fraction is already known. Taken together, these results allow us to derive the value of the third uncertain model parameter: we find that the cosmic-ray ionisation rate in this sightline is forty times faster than previously assumed. If such a high cosmic-ray flux is indeed ubiquitous in diffuse clouds, the discrepancy between chemical models and the previous observations of H3+ can be resolved.Comment: 6 pages, Nature, in pres

Electron power absorption dynamics in capacitive radio frequency discharges driven by tailored voltage waveforms in CF4

The power absorption dynamics of electrons and the electrical asymmetry effect in capacitive radio-frequency plasmas operated in CF4 and driven by tailored voltage waveforms are investigated experimentally in combination with kinetic simulations. The driving voltage waveforms are generated as a superposition of multiple consecutive harmonics of the fundamental frequency of 13.56 MHz. Peaks/valleys and sawtooth waveforms are used to study the effects of amplitude and slope asymmetries of the driving voltage waveform on the electron dynamics and the generation of a DC self-bias in an electronegative plasma at different pressures. Compared to electropositive discharges, we observe strongly different effects and unique power absorption dynamics. At high pressures and high electronegativities, the discharge is found to operate in the drift-ambipolar (DA) heating mode. A dominant excitation/ionization maximum is observed during sheath collapse at the edge of the sheath which collapses fastest. High negative-ion densities are observed inside this sheath region, while electrons are confined for part of the RF period in a potential well formed by the ambipolar electric field at this sheath edge and the collapsed (floating potential) sheath at the electrode. For specific driving voltage waveforms, the plasma becomes divided spatially into two different halves of strongly different electronegativity. This asymmetry can be reversed electrically by inverting the driving waveform. For sawtooth waveforms, the discharge asymmetry and the sign of the DC self-bias are found to reverse as the pressure is increased, due to a transition of the electron heating mode from the α-mode to the DA-mode. These effects are interpreted with the aid of the simulation results

Posterpräsentation der Promovierenden : Abstract-Band ; Promovierendentag 2023

Diese Sammlung enthält die Abstracts der Poster, die im Rahmen des Promovierendentages 2023 von kooperativ promovierenden Doktorandinnen und Doktoranden an der Hochschule für Angewandte Wissenschaften Hamburg (HAW Hamburg) präsentiert werden. Sie geben einen Einblick in spannende, durch wissenschaftliches Niveau und Praxisnähe geprägte Forschungsvorhaben.NonPeerReviewe

Electron-Ion Recombination in Atmospheric and Laboratory Plasmas

In this thesis, the measurements performed at CRYRING, Stockholm University, on the dissociative recombination of C2H+, C2H4+, C2D5+, C3H7+, C3D7+, C4D9+, Na+(D2O), CF+, CF2+ and CO2+ are presented. The dissociative recombination is the reaction in which a positive molecular ion captures an electron and stabilizes the capture by dissociation into neutral fragments. This reaction is of importance in many plasma environments, both naturally occurring, such as planetary atmospheres and interstellar clouds, and man-made, such as plasma enhanced reactors. The results from this study show that the hydrocarbon ions have a large probability for breaking several hydrogen bonds as well as a carbon-carbon bond. In the DR reaction of Na+(D2O), the fracture of the cluster bond is by far the dominating pathway, and the single F detachment is shown to be the main dissociation channel for the fluorocarbon ions. The carbon dioxide cation, CO2+, dissociates exclusively into CO and O, which makes a difference in atmospheric models. The DR rate coefficient is also presented for the different ions. Besides a discussion of the results, this thesis also includes a presentation of the experimental technique and analyzing procedure

The water, the region, the industry

This world has a limited supply of water, and with increasing population and withdrawals, availability continues to decrease. Worldwide, agriculture draws the greatest volume, though industry exceeds agriculture in many highly industrialized countries. Industry is making strides in increasing efficiency of water use; the issue is, it is often not enough. The food processing industry, for example, is one that has a great draw on water supply by nature. This paper analyzes various decisions an industry would need to look into considering water sustainability and international expansion. The United States is a nation the must be looked at by region—some with sufficient water supply, some with very limited supply. Australia, being the driest continent on earth, would be a poor choice for an industry with a large draw on water to expand into. India has its own unique issues—a fair amount of natural sources from monsoons and the Ganges, but using the available water effectively has been a struggle. Regulations on water use are another issue a business must consider when expanding internationally.Thesis (B.?)Honors Colleg