Sökning: "signal-to-noise"

Visar resultat 21 - 25 av 268 avhandlingar innehållade ordet signal-to-noise.

1. 21. Effective use of X rays in diagnostic radiology : Guidance for the optimisation of image quality and absorbed dose in the patient by use of a Monte Carlo computational model of the imaging chain

   Författare :Michael Sandborg; Heang-Ping Chan; Linköpings universitet; []
   Nyckelord :MEDICINE; MEDICIN;

   Sammanfattning : The primary objective of this thesis is to give guidance for the reduction of absorbed dose in the patient and the improvement of image quality by the optimisation of the various parameters which control the performance of the radiological imaging system. The optimisation means that image quality (contrast in screen-film imaging and signal-to-noise ratio in digital imaging) is kept constant and combinations of operating parameters which yields the lowest mean absorbed dose in the patient is determined. LÄS MER

3. 22. Nanofabricated Devices Based on Molecular Motors: Biosensing, Computation and Detection

   Författare :Mercy Lard; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biocomputing; actin; hollow nanowires; molecular concentration; molecular motors; nano-biosensor; myosin; nano-fabrication; nanowires; Fysicumarkivet A:2014:Lard;

   Sammanfattning : The thesis describes the use of molecular motors in nanofabricated devices designed for potential applications in biosensing, computation and detection. We utilize the well-established guiding principles for controlling the motion of actin filaments propelled by myosin molecular motors, and build upon these developments in order to improve upon previously demonstrated techniques, and establish new methods that, we believe, offer significant progress in these fields. LÄS MER

4. 23. Some concatenated and iterative decoding approaches for continuous phase modulation

   Författare :Ming Xiao; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; serially concatenated codes; Continuous phase modulation;

   Sammanfattning : Several concatenated and iterative decoding approaches are used toimprove the power efficiency of continuous phase modulation (CPM).First a symbol interleaver is used for serially concatenated CPM(SCCPM). Convergence of iterative decoding for this scheme can beearlier (lower SNR: Signal-to-Noise-Ratio) compared to bitinterleaved SCCPM. LÄS MER

5. 24. Miniature Plasma Sources for High-Precision Molecular Spectroscopy in Planetary Exploration

   Författare :Martin Berglund; Greger Thornell; Anders Persson; Felipe Iza; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MEMS; MST; Optogalvanic Spectroscopy; Molecular Spectroscopy; Split-Ring Resonator; Microplasma; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

   Sammanfattning : The prospect of finding life outside Earth has fascinated mankind for ages, and new technology continuously pushes the boundary of how remote and how obscure evidence we can find. Employing smaller, or completely new, types of landers and robots, and equipping them with miniature instruments would indeed revolutionize exploration of other planets and moons. LÄS MER

7. 25. Masking of wind turbine sound by ambient noise

   Författare :Karl Bolin; Mats Åbom; Sten Ljunggren; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik;

   Sammanfattning : The main objective of this work was to gain an increasing understanding of the properties of vegetation noise and also to the relative ratios of different natural ambient noises to mask wind turbine sound. A discrete vegetation noise model was developed and compared to an earlier model showing improved estimations, especially at frequencies below 0. LÄS MER