Search for dissertations about: "micro structure"

Showing result 1 - 5 of 371 swedish dissertations containing the words micro structure.

2. 1. Micro-Structure Modelling of Acoustics of Open Porous Material

   Author : Eva Lundberg; Peter Göransson; Per Wennhage; Ulf Orrenius; Camille Perrot; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustics; porous material; flow resistivity; micro-structure; anisotropic; foam; strut; Vehicle and Maritime Engineering; Farkostteknik;

   Abstract : Transportation is a large and growing part of the world’s energy consumption. This drives a need for reduced weight of rail vehicles, just as it does for road vehicles. In spite of weight reductions, the vehicle still has to provide the same level of acoustic comfort for the passengers. READ MORE

4. 2. The Auditor at Work : A study of auditor practice in Big 4 audit firms

   Author : Pernilla Broberg; Anne Loft; Torbjörn Tagesson; Bino Catasús; Företagsekonomiska institutionen; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Auditing; Auditors; Practice; Profession; Structure; Judgment; Comfort; Audit quality; Audit firm; Big 4; Auditing; auditors; practice; profession; structure; judgment; comfort; audit quality; Big 4; audit firms;

   Abstract : By combining different aspects of auditing and by focusing on the individual auditor and observing auditors at work, this dissertation explores the auditing concept. It focuses on activities carried out by auditors in local settings and how the macro-level phenomenon of “auditing” is realised in micro-level, day-to-day audit work. READ MORE

5. 3. Ageing of Asphalt Mixtures : Micro-scale and mixture morphology investigation

   Author : Prabir Kumar Das; Björn Birgisson; Nicole Kringos; Andreas Loizos; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ageing; Aggregate packing; Atomic force microscopy; Asphalt mixture; Bitumen; Diffusion; Finite element analysis; Gradation; Micro-structure; Mixture morphology; Oxidative ageing; Surface ageing;

   Abstract : There are many variables that affect the viscoelastic properties of asphalt mixtures with time, among which age hardening may be considered one of the important ones. Age hardening of asphalt mixtures is an irreversible process, which contributes to a reduction of the durability of pavements and eventually increases the maintenance cost. READ MORE

6. 4. Topographical micro-changes in corrugated board production : effects on flexographic post-print quality

   Author : Marcus Rehberger; Nils Enlund; Gunnar Engström; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; corrugated board; liner; double-facer; double-backer; gloss; surface roughness; micro structure; wear; paper metal friction; flexo; ink-jet; print quality; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Abstract : The appearance and design of a package are key properties to attract and to focus the attention of a customer. Print quality contributes to a great degree to achieve these requirements. Most critical perceived in terms of quality are print defects like mottling, gloss and stripiness, which all appear in the printing of corrugated board. READ MORE

7. 5. Micro-structural based acoustic modelling of anisotropic open cell materials

   Author : Eva Lundberg; Huina Mao; Bradley Semeniuk; Peter Göransson; Mathieu Gaborit; Romain Rumpler; Peter Göransson; Elke Deckers; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sound absorption; vehicle; anisotropic; foam; micro-structure; resource efficient; transfer matrix method; ljudabsorption; anisotrop; skum; mikrostruktur; TMM; fordon; resurseffektiv; Farkostteknik; Vehicle and Maritime Engineering;

   Abstract : A method for the calculation of the acoustic performance of open-cell foammaterials is discussed. From a known micro-structural geometry and theconstituent material, the relevant acoustic properties are computed using apreviously published analytical method for the calculation of the dynamicdrag impedance and a previously published method for the calculation of theelastic moduli. READ MORE