Sökning: "Acoustic devices"

Visar resultat 11 - 15 av 81 avhandlingar innehållade orden Acoustic devices.

1. 11. Microsystems Technology for Underwater Vehicle Applications

   Författare :Jonas Jonsson; Greger Thornell; Hugo Nguyen; Johan Köhler; Uppsala universitet; []
   Nyckelord :Aquatic; Submersible; Underwater; Micro; Miniaturized; Sonar; Sidescan; Topography; Laser; Diffractive; Optics; Sampler; Particle; Microorganism; Acoustic; Enriching; Conductivity; Temperature; Depth; CTD; Flow; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

   Sammanfattning : The aim of this thesis work has been to investigate how miniaturization, such as microsystems technology, can potentially increase the scientific throughput in exploration of hard-to-reach underwater environments, such as the subglacial lakes of Antarctica, or other challenging environments, including cave systems and wrecks. A number of instruments and subsystems applicable to miniature submersibles have been developed and studied, and their potential to provide a high functionality density for size-restricted exploration platforms has been assessed. LÄS MER

3. 12. Surface Modified Capillaries in Capillary Electrophoresis Coupled to Mass Spectrometry : Method Development and Exploration of the Potential of Capillary Electrophoresis as a Proteomic Tool

   Författare :Aida Zuberovic; Jonas Bergquist; Ziad El Rassi; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Topology optimization; Design optimization; Material distribution; Wave propagation problems; Inverse problems; Acoustic devices; Medical microwave tomography; High performance computing; Analytical chemistry; Analytisk kemi;

   Sammanfattning : The increased knowledge about the complexity of the physiological processes increases the demand on the analytical techniques employed to explore them. A comprehensive analysis of the entire sample content is today the most common approach to investigate the molecular interplay behind a physiological deviation. LÄS MER

4. 13. Large Eddy Simulation for the Analysis of Jet Noise Suppression Devices

   Författare :Markus Olander Burak; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LES; Mixer-ejector; Aeroacoustics; CAA; Acoustic liner; Broadband time-domain impedance boundary condition;

   Sammanfattning : Stricter noise regulations for commercial aircraft have increased interest in noise reduction techniques within the aerospace industry. To meet the requirements new noise suppression technologies have to be delveoped and the numerical methods need to be validated and possibly improved for the correct assessment of these new technologies. LÄS MER

5. 14. Large Eddy Simulation for the Analysis of Supersonic Jet Noise Suppression Devices

   Författare :Markus Olander Burak; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fluidic injection; mixer-ejector; jet noise; Kirchhoff; forward flight effects; LES; acoustic liner; supersonic turbulent jets; broadband time-domain impedance boundary condition; chevrons; shock-associated noise; CAA; aeroacoustics;

   Sammanfattning : Stricter noise regulations for commercial and military aircraft have increased interest in noise reduction techniques within the aerospace industry. To meet the requirements, new noise suppression technologies have to be developed and numerical methods need to be validated and possibly improved for the correct assessment of these technologies. LÄS MER

7. 15. Acoustic In-duct Characterization of Fluid Machines with Applications to Medium Speed IC-engines

   Författare :Antti Hynninen; Mats Åbom; Hans Bodén; Antonio Torregrosa; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; in-duct; acoustic source; source characterization; IC-engine;

   Sammanfattning : The unwanted sound, noise, can lead to health problems, e.g. hearing loss and stress-related problems. A pre-knowledge of noise generation by machines is of great importance due to the ever-shorter product development cycles and stricter noise legislation. LÄS MER