Sökning: "Reliability Testing"

Visar resultat 1 - 5 av 194 avhandlingar innehållade orden Reliability Testing.

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

    Författare :Diane-Perle Sadik; Hans-Peter Nee; Per Ranstad; Nando Kaminski; KTH; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 2. Track circuits’ robustness : Modeling, measurement and simulation

    Författare :Emilio Rodriguez; Ajit Kumar Verma; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Track circuit; Relay; False positive signals; Signalling in railway; Modelling; Simulation; Testing; Robustness; Interoperability; Reliability; Railway Infrastructure; Drift och underhållsteknik; Operation and Maintenance Engineering;

    Sammanfattning : In countries with rough weather conditions, frequent delays cause railway companies to waste time and money. Many of these delays are related to the train detection systems, as the old DC track circuits are still used in some countries, including Sweden, our case study. LÄS MER

  4. 3. Testing English Collocations : Developing Receptive Tests for Use with Advanced Swedish Learners

    Författare :Henrik Gyllstad; Engelska; []
    Nyckelord :HUMANIORA; HUMANITIES; foreign languages teaching; Applied linguistics; Språkinlärning; Language learning; vocabulary size; learning level; Swedish advanced learners of English; validity; second language vocabulary acquisition; test development; reliability; collocation; language testing; sociolinguistics; Tillämpad lingvistik; undervisning i främmande språk; sociolingvistik; English language and literature; Engelska språk och litteratur ;

    Sammanfattning : The research reported in this thesis has two main aims. The first aim is to develop tests capable of yielding reliable and valid scores of receptive knowledge of English collocations as a single construct, for use with advanced L2 learners of English. LÄS MER

  5. 4. Experimental Validation and Applications of a Phased Array Ultrasonic Testing Probe Model

    Författare :Xiangyu Lei; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Simulations; Applications; Nondestructive testing NDT ; Phased array ultrasonic testing PAUT ; Experiments;

    Sammanfattning : New manufacturing technologies are developed to facilitate flexible product designs and production processes. However, the quality of the final products should not be compromised. The assessment of product quality and integrity lies on various inspection methods. LÄS MER

  7. 5. Estimation of the reliability of systems described by the Daniels Load-Sharing Model

    Författare :Patrik Rydén; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Non-parametric and parametric estimation; Equal Load-sharing models; asymptotic distribution; martingale; resam-pling; life testing; reliability; Mathematical statistics; Matematisk statistik;

    Sammanfattning : We consider the problem of estimating the failure stresses of bundles (i.e. the tensile forces that destroy the bundles), constructed of several statisti-cally similar fibres, given a particular kind of censored data. LÄS MER