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Browsing Institutt for ingeniørvitenskap og sikkerhet by Author
Now showing items 1-4 of 4
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Bertella, Giovanna (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)[+][-]
Description: This is the final, peer reviewed author's manuscript of the article. Published version available at http://dx.doi.org/10.1080/13683500.2010.489638 URI: http://hdl.handle.net/10037/3524 File(s) in this item: 1
article.pdf (184.2Kb) -
Brodal, Eivind; Melandsø, Frank; Jacobsen, Svein Ketil (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)[+][-]
Abstract: New designs of high-resolution ultrasonic imaging systems that operate in the 30–100MHz region, for example, those based on linear transducer systems, are currently being investigated for medical purposes. Acoustic waves with frequencies in this range can detect microscopic structures in human tissue but will typically only penetrate a few mm because of large attenuation. However, this is sufficient for a diagnostic ultrasound scan of human skin. The signal-to-noise ratio and the focusing properties of the scanner are critical factors in dermatology, which are determined by the transducer design. A linear pulsed PVDF transducer array with a center frequency around 45MHz is studied by applying numerical simulations, based on the finite element method (FEM), of this electromechanical system. Tx-beamforming properties of linear arrays with one, three, five, and seven active elements are investigated at different depths. The image quality obtained from synthetic Rx-beamforming, using responses from five electrodes, is estimated from reconstructed images of 25–100 μm thick objects. The axial and lateral resolutions of these images are found to be similar with the Tx-beamforming resolution parameters estimated from the time-derivative of the pressure beams. URI: http://hdl.handle.net/10037/3941 File(s) in this item: 1
article.pdf (4.220Mb) -
Ivanova, Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)[+][-]
Abstract: The issue of oil spill emergency response in north-west Russia has become increasingly important following a substantial increase in maritime transport and major offshore developments in Russian waters. This study is an initial effort to outline the public and private agencies and organizations involved in handling oil spills in the Murmansk region and the structure of the oil spill emergency response system in the region. This study examines the formal relationships between federal and regional authorities and between the different subsystems at the regional level. Due to the paucity of academic literature and public documentation on this topic, this study to a large extent bases itself on interview data. A main finding is that the regional oil spill response system has not been fully developed. It further concludes that the system lacks a clearly formulated state policy, a single governing authority and a unified structure. Finally, the study demonstrates that the agencies and organizations involved in tackling oil spill emergencies in the Murmansk region are hampered by insufficient funding, which probably reduces their preparedness to combat oil spills. Description: This article is part of Maria Sydnes' doctoral thesis, which is available in Munin at http://hdl.handle.net/10037/4180 URI: http://hdl.handle.net/10037/4056 File(s) in this item: 1
article.pdf (331.9Kb) -
Sydnes, Are K. (Conference object; Konferansebidrag, 2012)[+][-]
Now showing items 1-4 of 4
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