Search for dissertations about: "destructive test"

Showing result 21 - 25 of 56 swedish dissertations containing the words destructive test.

  2. 21. Life assessment from weld microstructures at high temperatures

    Author : Jan Storesund; KTH; []
    Keywords : ;

    Abstract : Most pressure vessels in fossil power plant are designed forcreep. After operation of the order of the design lifetime thematerial may be degraded and further operation is limited.Methods which can prolong the lifetime and assess thecomponents is therefore demanded. READ MORE

  4. 22. Evaluation of Low Temperature Damage in Asphalt Mixtures with Non-Contact Resonance Testing

    Author : Abiy Bekele; Denis Jelagin; William Buttlar; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Asphalt concrete; dynamic modulus; non-contact excitation; resonance testing; thermally induced damage; viscoelasticity; Asfaltbetong; beröringsfri excitation; resonansfrekvens; resonansprovning; styvhetsmodul; Building Materials; Byggnadsmaterial;

    Abstract : Thetemperature induceddamage in asphalt mixtureshas always been a major distress that requires a substantialconsiderationin the asphalt industry. One of the most important aspects of studying temperature induceddamage is developing a practical test method for evaluation of the material’s resistanceto it. READ MORE

  5. 23. Enhancements in Dielectric Response Characterization of Insulation Materials

    Author : Xiangdong Xu; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; harmonic limited waveform; air reference method; contact-free electrode; geometric corrections.; frequency domain spectroscopy; Dielectric characterization;

    Abstract : The increasing demand of integrating various renewable energy recourses in power system requires extensive use of power electronic solutions, such as HVDC and FACTS, as these techniques allow energy conversion between different frequencies and serves to stabilize the network. Consequently, electric stresses other than traditional 50/60 Hz sinusoidal voltage stress are acting on high voltage insulation materials. READ MORE

  6. 24. Nondestructive testing and antenna measurements using UWB radar in industrial applications

    Author : Vipin Choudhary; Magnus Jansson; Daniel Rönnow; Niclas Björsell; Mats Pettersson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Many industries are rapidly substituting the manual test operations and move towards automated operations using modern technologies.Modern technologies such as digital cameras, sonic sensors, infrared sensors, and radar and lidar systems are used for non-destructive testingoperations. READ MORE

  7. 25. The village that vanished : The roots of erosion in a Tanzanian village

    Author : Vesa-Matti Loiske; Ulf Sporrong; Aud Talle; Stockholms universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; soil erosion; soil conservation; Tanzania; Iraqw; social stratification; land tenure; Mama Issara; Giting; Hanang; Political Ecology; Scientific realism; Geography; villagization; Human geography; Kulturgeografi; Human Geography; kulturgeografi;

    Abstract : In the village'of Citing in the northern highlands of Tanzania, the factors: social stratification, land tenure, production strategies, investment patterns and the economic uncertainties of society are studied and their relationship to land degradation is examined. The main assumption of the study is that the causes of land degradation are so complex that a methodology that emphasises contextualisation has to be used. READ MORE