Search for dissertations about: "Ulf Persson"

Showing result 1 - 5 of 17 swedish dissertations containing the words Ulf Persson.

  2. 1. Valuing Reductions in the Risk of Traffic Accidents Based on Empirical Studies in Sweden

    Author : Ulf Persson; Trafik och väg; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Säkerhetsteknik; Safety technology; Vägtransportteknik; Road transport technology; Road Traffic; Risk Reduction; Value of Life; Cost of Accidents; Stated Preference; Contingent Valuation;

    Abstract : At the beginning of the 1990s the Swedish National Road Administration (SNRA) adopted the willingness to pay (WTP) approach for estimating the benefits of safety improvements. However, since then there have been discussions about how to find the most valid and reliable empirical methods to conduct WTP studies. READ MORE

  4. 2. Vitamin A Intake, Status and Improvement Using the Dietary Approach : Studies of Vulnerable Groups in Three Asian Countries

    Author : Viveka Persson; Ulf Svanberg; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Obstetrics and gynaecology; Vitamin A deficiency; vitamin A intake; plant sources; preformed vitamin A; variability; reliability; 24-h recall; helminthiasis; retinol; beta-carotene; iron; bioavailability; children; pregnancy; Obstetrik och kvinnosjukdomar; Obstetrics and women s diseases; Obstetrik och kvinnosjukdomar; pediatrik; Pediatrics;

    Abstract : Studies were performed on methodological issues on vitamin A intake, status and improvement in three Asian countries, to improve the dietary approach recommended by FAO/WHO to alleviate vitamin A deficiency in low-income countries.The reliability of the practical 24-hour dietary recall method to assess individual intake of vitamin A during pregnancy was investigated in Central Java, Indonesia. READ MORE

  5. 3. Assessment of Aircraft Radar Cross-Section for Detection Analysis

    Author : Björn Persson; Ulf Ringertz; Martin Norsell; Peter Bull; João Tasso de Figueiredo Borges de Sousa; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flyg- och rymdteknik; Aerospace Engineering; Försvarssystem;

    Abstract : Hiding from and surprising an opponent are tactics that have been used in warfare throughout history. They were features that aircraft originally possessed when they were first used in military operations. However, development of military technology is an endless struggle between advances in technology and counter technology. READ MORE

  6. 4. The neuropeptide VIP and the IL-6 family of cytokines in bone : effects on bone resorption, cytokine expression and receptor signalling in osteoblasts and bone marrow stromal cells

    Author : Emma Persson; Ulf Lerner; Andreas Kindmark; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; osteoblast; bone resorption; cytokines; IL-6; neuropeptides; VIP; transcription factor; Cell biology; Cellbiologi;

    Abstract : Bone tissue is continuously degraded and rebuilt to respond to the needs of the body. Cells of the osteoblast lineage are responsible for the formation of bone, whereas the resorption of bone tissue is carried out by osteoclasts. READ MORE

  7. 5. Strings as Sigma Models and in the Tensionless Limit

    Author : Jonas Persson; Ulf Lindström; Joseph Minahan; Fawad Hassan; Uppsala universitet; []
    Keywords : Theoretical physics; Theoretical Physics; String Theory; Tensionless Strings; Supergravity Backgrounds; Plane Wave; Extended Supersymmetry; Non-Linear Sigma Models; Generalized Complex Geometry; T-duality; Teoretisk fysik;

    Abstract : This thesis considers two different aspects of string theory, the tensionless limit of the string and supersymmetric sigma models with extended supersymmetry. First, the tensionless limit is used to find a IIB supergravity background generated by a tensionless string. The background has the characteristics of a gravitational shock-wave. READ MORE