Local sound field synthesis

This thesis investigates the physical and perceptual properties of selected methods for (Local) Sound Field Synthesis ((L)SFS). In agreement with numerical sound field simulations, a specifically developed geometric model shows an increase of synthesis accuracy for LSFS compared to conventional SFS approaches. Different (L)SFS approaches are assessed within listening experiments, where LSFS performs at least as good as conventional methods for azimuthal sound source localisation and achieves a significant increase of timbral fidelity for distinct parametrisations.Die Arbeit untersucht die physikalischen und perzeptiven Eigenschaften von ausgewählten Verfahren zur (lokalen) Schallfeldsynthese ((L)SFS). Zusammen mit numerischen Simulationen zeigt ein eigens entwickeltes geometrisches Modell, dass LSFS gegenüber konventioneller SFS zu einer genauere Synthese führt. Die Verfahren werden in Hörversuchen evaluiert, wobei LSFS bei der horizontalen Lokalisierung von Schallquellen eine Genauigkeit erreicht, welche mindestens gleich der von konventionellen Methoden ist. Für bestimmte Parametrierung wird eine signifikant verbesserte klangliche Treue erreicht

3D Bioprinted Engineered Living Materials for Continuous Organophosphorus Compound Detoxification

Engineered living materials (ELMs) are a rapidly emerging class of materials, demonstrating a wide range of functionalities, including responsive morphing, self-healing, and bio-catalysis. 3D bioprinted hydrogels have been used for the fabrication of high resolution, compartmentalised, and load-bearing structures suitable for hosting microbial metabolism, and accordingly represent an ideal environment for ELMs. The interactions between material frameworks, such as hydrogels, and encapsulated life are now beginning to be investigated.Herein, by 3D printing a hydrogel-encapsulated population of Escherichia coli, a chemically inducible, metabolically active, microbial ELM was fabricated. The material was characterised using a wide range of techniques, including fluorescence microscopy and cryogenic electron microscopy. Toxic organophosphorus compound (OPC) detoxifying capabilities were conveyed to the material through inducible expression of Agrobacterium radiobacter phosphotriesterase (arPTE). The reaction diffusion process occurring at the interface of the OPC detoxifying ELM was investigated using continuous fluorescence imaging of Coumaphos hydrolysis.. Principal component analysis was then used to uncover spatial and temporal features within this data, with relevance for future optimisation of catalytic microbial ELMstructures. To further demonstrate the applicability of this 3D printable microbial ELM, the material was incorporated into an entirely 3D printed flow reactor, demonstrating effective, cyclical detoxification of an OPC solution at high flow rate.Looking towards the future of ELM design, a novel, 3D printable, contractile-thermosensitive,double-network hydrogel was used to create thermo-responsive OPC degrading bioreactors, capable of autonomously controlling their performance

Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014

In consideration of the remarkable intensity of research in the field of Virtual Acoustics, including different areas such as sound field analysis and synthesis, spatial audio technologies, and room acoustical modeling and auralization, it seemed about time to organize a second international symposium following the model of the first EAA Auralization Symposium initiated in 2009 by the acoustics group of the former Helsinki University of Technology (now Aalto University). Additionally, research communities which are focused on different approaches to sound field synthesis such as Ambisonics or Wave Field Synthesis have, in the meantime, moved closer together by using increasingly consistent theoretical frameworks. Finally, the quality of virtual acoustic environments is often considered as a result of all processing stages mentioned above, increasing the need for discussions on consistent strategies for evaluation. Thus, it seemed appropriate to integrate two of the most relevant communities, i.e. to combine the 2nd International Auralization Symposium with the 5th International Symposium on Ambisonics and Spherical Acoustics. The Symposia on Ambisonics, initiated in 2009 by the Institute of Electronic Music and Acoustics of the University of Music and Performing Arts in Graz, were traditionally dedicated to problems of spherical sound field analysis and re-synthesis, strategies for the exchange of ambisonics-encoded audio material, and – more than other conferences in this area – the artistic application of spatial audio systems. This publication contains the official conference proceedings. It includes 29 manuscripts which have passed a 3-stage peer-review with a board of about 70 international reviewers involved in the process. Each contribution has already been published individually with a unique DOI on the DepositOnce digital repository of TU Berlin. Some conference contributions have been recommended for resubmission to Acta Acustica united with Acustica, to possibly appear in a Special Issue on Virtual Acoustics in late 2014. These are not published in this collection.European Acoustics Associatio

Production and application of textile materials

This specialized publication is dedicated to technical and technological solutions in textile production. Engineering solutions in the production of fibers and fabrics for both technical and domestic use are considered. Particular attention in the book is given to the study of textile products for biomedical applications. Modern medical fabrics and fibers are used as dressing and suture material and significantly accelerate the recovery processes after surgical operations and burn injuries. Fibers and fabrics are currently often used as a reinforcing element in the production of various composite materials, which are often used in mechanical engineering and in the construction sector. A separate chapter is devoted to textile reinforcing materials. Environmental problems in textile production are mainly related to the dyeing process and the chemical treatment of fabrics and fibers. Some aspects of textile dyeing and wastewater treatment processes are also discussed in this publication. The book will be useful to specialists involved in textile production and related industries