Search for dissertations about: "high"

Showing result 1 - 5 of 20463 swedish dissertations containing the word high.

  1. 1. Improved high velocity cold copaction processing polymer powder to high performance parts

    University dissertation from Stockholm : KTH

    Author : Bruska Azhdar; KTH.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; high-velocity compaction; powder polymers; polyamide-11; relaxation assist; compactibility; relative green density; morphology; pull-out; springback; NATURAL SCIENCES Chemistry Organic chemistry Polymer chemistry; NATURVETENSKAP Kemi Organisk kemi Polymerkemi;

    Abstract : A uniaxial High-Velocity Compaction (HVC) process for polymer powder using a cylindrical, hardened steel die and a new technique with relaxation assist was tested with a focus on the compactibility characteristics and surface morphology of the compacted materials using various heights of relaxation assist device with different compacting profiles.Relaxation assist device was presented as a new technique to reduce springback, pull-out phenomenon and to improve the compaction process. READ MORE

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

    University dissertation from Stockholm : Elektrotekniska system

    Author : Per Ranstad; KTH.; [2004]
    Keywords : soft-switching; dc-converter; high-frequency; high-voltage;

    Abstract : .... READ MORE

  3. 3. High temperature galling influencing parameters and mechanisms

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Leonardo Pelcastre; Luleå tekniska universitet.; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine Elements; Maskinelement; Centre - Centre for High Performance Steel CHS ; Centrumbildning - Centrum för högpresterande stål CHS ;

    Abstract : Damage of forming tools at elevated temperatures is a major problem in metal forming processes such as hot stamping. Of special importance is the occurrence of adhesion and gross material transfer from the work-piece to the tool surface, a phenomenon known as galling. READ MORE

  4. 4. Sense, Actuate and Survive Ceramic Microsystems for High-Temperature Aerospace Applications

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Peter Sturesson; Uppsala universitet.; Försvarshögskolan.; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology; High temperature; ceramics; microsystems; aerospace; sensors; thrusters; Försvarssystem; Military Technology; high temperature;

    Abstract : In aerospace applications, but also in manufacturing, mining, energy industry and natural hazards, high temperature, corrosion, erosion and radiation, challenge the performance and being of hardware.In this work, high-temperature co-fired ceramic (HTCC) alumina and platinum have been used for a range of devices intended for aerospace applications at up to 1000°C. READ MORE

  5. 5. Experimental Study of some Potassium and Sodium Bearing Aluminosilicates at High Temperatures and High Pressures

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Faramarz Tutti; Uppsala universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Phlogopite; Orthoclase; Jadeite; Albite; Calcium ferrite; Hollandite; Dehydroxylation; High temperature; High pressure; Lower mantle; Geochemistry; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Abstract : This dissertation presents the results of a high-temperature and high-pressure experimental study of some abundant aluminositicates, which are the main repositories for the two geochemically important elements, sodium and potassium, in the Earth's crust. Phase transitions of end member alkali feldspars and jadeite clinopyroxene are studied at high and ultrahigh pressures corresponding to the conditions between the transition zone and the deep Earth's lower mantle. READ MORE