Search for dissertations about: "Ranstad"

Showing result 1 - 5 of 6 swedish dissertations containing the word Ranstad.

  1. 1. Importance of relationships with primary care. Implications for patients and health care

    Author : Karin Ranstad; Allmänmedicin och samhällsmedicin; []
    Keywords : Primary care; Hospital admission; Hospitalisation; Choice Behavior;

    Abstract : .... READ MORE

  2. 2. On high-frequency soft-switching DC-converters for high-voltage applications

    Author : Per Ranstad; KTH; []
    Keywords : soft-switching; dc-converter; high-frequency; high-voltage;

    Abstract : .... READ MORE

  3. 3. Control and Design Aspects of Components and Systems in High-Voltage Converters for Industrial Applications

    Author : Per Ranstad; Hans-Peter Nee; Alfred Rufer; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-voltage converter; resonant converter; high-voltage transformer; transformer parasitics; IGBT; soft-switching; control; Electric power engineering; Elkraftteknik;

    Abstract : High-frequency dc-dc converters are widely used in power electronic applications, both in consumer products and industrial products. By operating the converter at higher frequencies both a smaller size and better control characteristics can be obtained. READ MORE

  4. 4. On Reliability of SiC Power Devices in Power Electronics

    Author : Diane-Perle Sadik; Hans-Peter Nee; Per Ranstad; Nando Kaminski; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon Carbide; Metal-Oxide-Semiconductor Field-Effect Transistor MOSFET ; Junction Field-Effect Transistor JFET ; Bipolar Junction Transistor BJT ; Reliability; Failure Analysis; Reliability Testing; Short- Circuit Currents; Humidity; Resonant converter; Series-resonant converter SLR ; Base drive circuits; Gate drive circuits; Life-Cycle Cost Analysis LCCA ; Kiselkarbid; MOSFETar; JFETar; Bipolär Junction Transistor BJT ; Tillförlitlighet; Robusthet; Felanalys; Tillförlitlighetstestning; Kortslutningsströmmar; Luftfuktighet; Resonansomvandlare; Serie-resonansomvandlare SLR ; Basdrivkretsar; Gate-drivkretsar; Felskydd; Livscykelkostnadsanalys; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Silicon Carbide (SiC) is a wide-bandgap (WBG) semiconductor materialwhich has several advantages such as higher maximum electric field, lowerON-state resistance, higher switching speeds, and higher maximum allowablejunction operation temperature compared to Silicon (Si). In the 1.2 kV - 1. READ MORE

  5. 5. Bacteria and geochemistry in a former uranium open pit mine - mobilization of trace metals

    Author : Frida Edberg; Sara J. M. Holmström; Hans Borg; Stephan M. Kraemer; Stockholms universitet; []
    Keywords : Pseudomonas fluorescens; siderophore; Ranstad; alum shale; iron; pyrosequencing; redox; size fractionation; NATURAL SCIENCES; NATURVETENSKAP; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : In mining areas around the world, chemical and biotic processes have lead to the release of toxic substances, e.g. metals. Microbial processes influence metal speciation, while the chemical environment shapes and controls microbial populations. READ MORE