Search for dissertations about: "moisture condition"

Showing result 16 - 20 of 43 swedish dissertations containing the words moisture condition.

  2. 16. On Estimation of Moisture Content in Mass Impregnated Distribution Cables

    Author : Roberts Neimanis; KTH; []
    Keywords : ;

    Abstract : Mass impregnated paper insulated cables in distributionnetworks (6-33 kV) nowadays are gradually being replaced byXLPE insulated cables, yet, the percentage of mass impregnatedcables in distribution networks is still considerable. Thisreplacement is a long-term strategy, where right timing,properly made investments, etc. play crucial role. READ MORE

  4. 17. Nitrogen fixation in the lichen Stereocaulon paschale

    Author : Kerstin Huss-Danell; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nitrogen fixation; lichen; acetylene reduction; environmental factors; physiological condition; pine forest; Sweden;

    Abstract : The thesis is a summary and discussion of six papers.The purpose of the investigation was to study the influence of (i) environmental factors and (ii) the physiological condition of the thallus on nitrogen fixation in the lichen Stereocaulon paschale (L.) Fr. READ MORE

  5. 18. X-ray computed tomography to study moisture distribution in wood

    Author : José Couceiro; Lars Hansson; Mike Milota; Luleå tekniska universitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Träteknik; Wood Science and Engineering;

    Abstract : X-ray computed tomography (CT) has been used as an analysing tool for different features in wood research since the beginning of the1980s, but it can also be used to study wood-water interactions in different ways, such as by determining wood moisture content (MC). The determination of wood MC with CT requires two CT images: one at the unknown moisture distribution and a second one at a known reference MC level, usually at oven-dry condition. READ MORE

  6. 19. Dielectric Response and Partial Discharge Diagnostics of Insulation Systems by Utilizing High Voltage Impulses

    Author : Roya Nikjoo; Hans Edin; Andrea Cavallini; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dielectric Response; Transients; Transformer bushing; Oil-impregnated paper; Moisture content; Partial discharge; Surface PD; Cavity PD; Superimposed impulse; Nanoparticles; Electrical Engineering; Elektro- och systemteknik;

    Abstract : In this thesis, power system transients are considered as an opportunity for development of on-line diagnostics of power components and specifically the insulation systems of power transformers and bushings.A new technique for on-line dielectric response measurement of power transformer bushings is proposed which utilizes natural transients in the power system, such as lightning and switching surges, as stimuli. READ MORE

  7. 20. Climatic conditions inside nuclear reactor containments : Evaluation of moisture condition in the concrete within reactor containments and interaction with the ambient compartments

    Author : Mikael OXFALL; Avdelningen för Byggnadsmaterial; []
    Keywords : kärnkraft; betong; in situ mätningar; relativ fuktighet; kokvattenreaktorer; tryckvattenreaktorer; masstransport;

    Abstract : Safety is the top priority at a nuclear facility. The nuclear power plants are designed to prevent radioactive leakage to the surroundings, both during normal operation as well as in case of a severe accident. One of the most important structures in a nuclear power plant, with regard to safety, is thus the reactor containment wall. READ MORE