Search for dissertations about: "sporadic sources"

Showing result 1 - 5 of 10 swedish dissertations containing the words sporadic sources.

  2. 1. Radio meteors above the Arctic Circle : radiants, orbits and estimated magnitudes

    Author : Csilla Szasz; Asta Pellinen-Wannberg; Noah Brosch; Umeå universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; meteors; meteoroids; dust; meteor radiants; meteoroid orbits; sporadic sources; radar; meteorradianter; meteoroidbanor; sporadiska källområden; radar; meteorer; meteoroider; interplanetärs stoft; Space engineering; Rymdteknik;

    Abstract : This thesis presents results based on data collected with the 930 MHz EISCAT UHF radar system and three SKiYMet specular meteor radars. It describes in detail a method for meteoroid orbit calculation. The EISCAT UHF system comprises three identical 32 m parabolic antennae: one high-power transmitter/receiver and two remote receivers. READ MORE

  4. 2. Risk characterization of familial cancer using the Swedish family-cancer database with a special reference to breast cancer

    Author : Pauli Vaittinen; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Familial cancer; genetic epidemiology; register study; standardized relative risk.;

    Abstract : This thesis reports on epidemiological studies on family related cancer in Sweden. The Family-Cancer Database was constructed in 1996 from several national registries. Family relations were available from the Generation register, cancer cases from the Cancer registry and socioeconomic information from Censuses. READ MORE

  5. 3. Spectral and Temporal Studies of Gamma-Ray Bursts

    Author : Luis Borgonovo; Claes-Ingvar Björnsson; Jerry Fishman; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

    Abstract : Gamma-ray bursts (GRBs) are sporadic flashes of light observed primarily in the gamma-ray band. Being the brightest explosions in the Universe since its birth, they are at present also the furthest astronomical sources detected. READ MORE

  6. 4. Evolution and host-specific adaptations of Legionella pneumophila

    Author : Anaísa B. Moreno; Lionel Guy; Dan I. Andersson; Fredrik Söderbom; Alexander W. Ensminger; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Evolution; Legionella pneumophila; host-adaptation; experimental evolution; Acanthamoeba castellanii; transfection; Mikrobiologi; Microbiology;

    Abstract : How bacteria evolve pathogenic traits is shaped by their communities and environments. Legionella pneumophila is ubiquitous in aquatic habitats, where it persists by replicating within a broad range of protozoan hosts. Using the same mechanisms, L. READ MORE

  7. 5. Physical activity assessed by accelerometry in children

    Author : Andreas Nilsson; Karin Piehl-Aulin; Ulf Ekelund; Gareth Stratton; Örebro universitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; activity patterns; adolescents; health promotion; activity monitor; sedentary; Medicine; Medicin; Biomedicin; Biomedicine;

    Abstract : Physical activity (PA) is likely to constitute an important aspect of health-related behaviour in growing children. However, the knowledge on levels and patterns of PA in children is limited, due to the difficulty of precisely measuring this complex behaviour in normal daily living. READ MORE