Depletionâ mediated piezoelectric AlGaN/GaN resonators

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/134894/1/pssa201532746_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134894/2/pssa201532746.pd

Coalescence aspects of III-nitride epitaxy

In this work, coalescence aspects of wurtzite-III-nitride epitaxy are addressed. The coalescence phenomena have been studied in thin epilayers by means of electron and atomic force microscopies, and electron and x-ray diffractions. This study generalizes the growth parameters responsible for the rapid coalescence of III-nitride films, and describes the coalescence qualitatively and, partly, analytically for the case of heteroepitaxy in nonequilibrium conditions. Coalescence time and the corresponding diffusion coefficients at elevated temperatures were estimated for GaN and InN depositions. The rate of coalescence has been found to impact on the structure and morphology of III-nitride epilayers. A simple growth model was suggested to explain the formation of domain boundaries and (0001) stacking faults formed during the coalescence. In particular, it is shown that two adjacent and tilted, hexagonal-shaped 2H domains may form a noncoherent boundary explicitly along a {1100} plane. We also suggest that the interaction between tilted domains induces the localized lateral growth of the most epitaxially oriented domain forming a basal (0001) stacking fault followed by the formation of surface macrosteps, and consequently the termination of a threading dislocation by its dissociation and propagation under the formed (0001) stacking fault.German Research Foundation (DFG) DFG Grant No. AM105 / 1-1 AlemaniaComisión Interministerial de Ciencia y Tecnología (CICYT) No. MAT2004-01234 EspañaUnión Europea NICOP No. 00014-03-1-030

Neues Verfahren zur in situ-Sanierung von PAK in Boeden Schlussbericht

Aim of the work was to set up the presumptions for a new method for in situ remediation of PAH contaminated sites. This technique is based on the extraction of PAH from the soil by use of plant oils. The analytical detection of PAH in plant oils was developed and optimised. In lab scale a more or less complete removal of PAH from contaminated soils was shown. By use of plant oils PAH could be effectively extracted from sandy and clay soils. Residual amounts of PAH and plant oil could be degraded microbiologically. No negative ecotoxicological effects on plant, terrestic and aquatic tests were observed after soil extraction. The removal of PAH from plant oil is easily performed by conventional adsorption with activated carbon. The use of so treated plant oil for PAH extraction from soil gives the same results as fresh plant oil. (orig.)SIGLEAvailable from TIB Hannover: F03B332+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman

Plant equipped with biofilm reactors for butanol production

La presente invenzione si riferisce ad un sistema di reattori a biofilm collegati in serie in cui la fermentazione ABE (Acetone-Butanolo-Etanolo) è effettuata in un sistema multi-stadio e i prodotti (acetone, butanolo, etanolo, acido acetico e acido butirrico) sono ottenuti per fermentazione anaerobica attraverso la conversione degli zuccheri presenti nella corrente di alimentazione all’impianto. Nel sistema di reattori secondo l’invenzione è possibile realizzare alte concentrazioni di butanolo migliorando così la produttività specifica o aumentare la conversione dello zucchero alimentato, aumentando in ogni caso l’efficienza economica del processo

Plant equipped with biofilm reactors for butanol production

La presente invenzione si riferisce ad un sistema di reattori a biofilm collegati in serie in cui la fermentazione ABE (Acetone-Butanolo-Etanolo) è effettuata in un sistema multi-stadio e i prodotti (acetone, butanolo, etanolo, acido acetico e acido butirrico) sono ottenuti per fermentazione anaerobica attraverso la conversione degli zuccheri presenti nella corrente di alimentazione all’impianto. Nel sistema di reattori secondo l’invenzione è possibile realizzare alte concentrazioni di butanolo migliorando così la produttività specifica o aumentare la conversione dello zucchero alimentato, aumentando in ogni caso l’efficienza economica del processo

Zur Uebertragbarkeit der mit Modellfluiden gewonnenen kLa-Beziehungen auf reale Fermentationsprozesse in begasten Ruehrkesselfermentern

SIGLETIB: D.Dt.F./AC 1000 (17,62) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Reaktionstechnische Grundlagen von Fermentationsprozessen

TIB: AC 8848+MF / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman