Search for dissertations about: "peak-to-valley method"

Found 5 swedish dissertations containing the words peak-to-valley method.

  1. 1. On-line Mobile in situ Gamma Spectrometry

    University dissertation from Radiation Physics, Lund

    Author : Thomas Hjerpe; Lund University.; Lunds universitet.; [2004]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; radiobiologi; Kärnfysik; Nuclear physics; radiation protection.; 137Cs; peak-to-valley method; depth distribution; orphan source search; orphan sources; emergency preparedness; mobile gamma spectrometry; nuclear accidents; Nuclear medicine; radiobiology; Nukleärmedicin;

    Abstract : Mobile in situ gamma spectrometry is an important instrument in the emergency preparedness for nuclear accidents. This work contributes through the development of strategies and analysis methods for two applications: an on-line search for gamma-emitting orphan sources and on-line estimation of the depth distribution of 137Cs. READ MORE

  2. 2. Methods for localizing and quantifying radionuclide sources and deposition using in situ gamma spectrometry : Critical review of the peak-to-valley method based on experimental studies and applications in Georgia and Japan

    University dissertation from Lund University, Faculty of Science

    Author : Karl Östlund; Lund University.; Lunds universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; In situ gamma spectrometry;

    Abstract : This thesis describes investigations made on mobile and stationary gammaspectrometry made both under laboratory conditions and in situ. The objective hasbeen to identify and quantify radionuclides in the form of point sources,contamination and widespread deposition in situations where the measurementgeometry is not known beforehand. READ MORE

  3. 3. Design and fabrication of hidden hinge monocrystalline silicon micromirrors for maskless lithography

    University dissertation from Lund University, Faculty of Science

    Author : Martin Bring; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; isotropic etching; LOCOS; micromirror; maskless lithography; chevron notch; low temperature transfer bonding; fracture toughness;

    Abstract : Micromirror-based maskless lithography has recently received attention as an attractive candidate to tackle challenges associated with the continued de-vice scaling in the semiconductor industry. The micromirrors work by diffrac-tion and the requirements on planarity are very tough, e.g. peak-to-valley dif-ferences of a few nanometers. READ MORE

  4. 4. Magnesium Diboride (MgB2) and Ca-doped YBa2Cu3O7-? : Thin Films and Devices. Fabrication and Characterization

    University dissertation from Lund University, Faculty of Science

    Author : Anayesu Malisa; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ca-doped YBa2Cu3O7-?; MgB2; bicrystal; superconductor; nanobridge; thin film; Josephson effect; Josephson junction;

    Abstract : Magnesium diboride (MgB2) is a superconductor with an exceptionally high transition temperature, Tc, of 39 K. This work describes deposition of high quality and superconducting films of MgB2 for electronic applications. Experiments on Ca-doped YBa2Cu3O7-? films and fabrication of bicrystal Josephson junctions are also described. READ MORE

  5. 5. Supra-threshold hearing loss and wide dynamic range compression

    University dissertation from Stockholm : Karolinska Institutet, Department of Clinical Neuroscience

    Author : Henrik L Olsen; Karolinska Institutet.; Karolinska Institutet.; [2004]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Hearing impairment; compression; hearing aids; modulated noise; speech intelligibility; temporal resolution; modulation transfer function;

    Abstract : Cochlear hearing loss leads to deficits in many perceptual aspects, including threshold elevation (loss of sensitivity), reduction of auditory dynamic range (loudness recruitment) and problems with resolving sounds (loss of supra-threshold hearing). An ongoing debate is whether assessment of the individual supra-threshold hearing provides information which is likely to have an important influence on clinical decisions on signal processing strategies. READ MORE