Sökning: "transducers"

Visar resultat 16 - 20 av 116 avhandlingar innehållade ordet transducers.

1. 16. Evaluation of Errors and Limitations in Ultrasound Imaging Systems

   Författare :Mattias Mårtensson; Lars-Åke Brodin; Peter Rask; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Medical engineering; Medicinsk teknik;

   Sammanfattning : There are binding regulations requiring safety and efficacy aspects of medical devices. The requirements ask for documentation that the devices are safe and effective for their intended use, i.e. if a device has a measuring function it must be correct. LÄS MER

3. 17. Contact-free surface chemistry with acoustic levitation

   Författare :Smaragda Maria Argyri; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; machine learning; surface chemistry; Acoustic levitation;

   Sammanfattning : An ultrasonic acoustic levitator is a device that allows the implementation of contact-free studies by generating an airborne acoustic pressure field, capable of trapping, in mid-air, small volume samples (.... LÄS MER

4. 18. (Nano)materials for electrochemical sensing applications in different fields

   Författare :Nasrin Razmi; Omer Nur; Magnus Willander; Frank Bier; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electrochemical bio sensors; Nanomaterials; AuNSs; α-Fe2O3 ZnO nanocomposite; RuO2-Nf pH electrodes; MIP technology;

   Sammanfattning : Health care and the medical industry, environmental monitoring and food sector are just a few examples of human’s major concerns. Design and analytical applications of (bio)sensors and sensing (nano)materials in these fields which have drawn tremendous attention by scientific community, require multidisciplinary knowledge in materials, transducers, and measurement methodologies. LÄS MER

5. 19. Anal fistulae - Three-dimensional endoanal ultrasound and outcomes of collagen plug treatment

   Författare :Ursula Fält; Kirurgi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; analfistel; Crohns sjukdom; kryptoglandulär fistel; kollagenplugg; komplicerad analfistel; tredmensionellt endoanalt ultraljud; analkanalens längd; analkanalens anatomi; anal fistula; Crohn s disease; cryptoglandular fistula; anal fistula plug; Complex anal fistula; three-dimensional endoanal ultrasound; anal canal length; anal canal anatomy;

   Sammanfattning : Background: The treatment of complex anal fistulae remains a therapeutic challenge. Early anal fistula plug (AFP) studies showed high success rates, while later reports demonstrated success rate of 13-100% at usual follow-up of 6-24 months. LÄS MER

7. 20. Improved modeling of ultrasonic systems : feasible for industrial applications

   Författare :Pär-Erik Martinsson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

   Sammanfattning : In this thesis tree aspects of ultrasonic measurement and modelling techniques have been investigated. Namely, transducer diffraction modelling using equivalent circuits, wave propagation in multi phase flow, and wave propagation in gases. The work is relevant both from an scientific point of view and from an engineering point of view. LÄS MER