Sökning: "direct method"

Visar resultat 11 - 15 av 1166 avhandlingar innehållade orden direct method.

1. 11. Studies on instability and optimal forcing of incompressible flows

   Författare :Mattias Brynjell-Rahkola; Dan S. Henningson; Ardeshir Hanifi; Philipp Schlatter; François Gallaire; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrodynamic stability; optimal forcing; resolvent operator; Laplace preconditioner; spectral element method; eigenvalue problems; inverse power method; direct numerical simulations; Falkner–Skan–Cooke boundary layer; localized roughness; crossflow vortices; Blasius boundary layer; localized suction; helical vortices; lid-driven cavity; cylinder flow; Teknisk mekanik; Engineering Mechanics;

   Sammanfattning : This thesis considers the hydrodynamic instability and optimal forcing of a number of incompressible flow cases. In the first part, the instabilities of three problems that are of great interest in energy and aerospace applications are studied, namely a Blasius boundary layer subject to localized wall-suction, a Falkner–Skan–Cooke boundary layer with a localized surface roughness, and a pair of helical vortices. LÄS MER

3. 12. Towards Human Supervisory Control in Advanced Manufacturing Systems

   Författare :Johan Stahre; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; human; CIM; case study; operator; FMS; supervisory control; method; manufacturing; model; cross-disciplinary;

   Sammanfattning : This thesis is on the topic of Human Supervisory Control in Advanced Manufacturing Systems (AMS). Presently, these systems suffer from inferior reliability and low productivity, unless "nursed" by skilled operators. Operators controlling the AMS are approaching a work situation similar to that of operators in continuous process manufacturing. LÄS MER

4. 13. Influences, effects and changes from interventions by eco-labelling schemes - What a Swan can do?

   Författare :Åke Thidell; Internationella miljöinstitutet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Direct effect; Eco-labelling; Intervention theory; Environmental labelling; Nordic Swan; Measurement method; Indirect effect;

   Sammanfattning : Eco-labelling is a voluntary and informative policy instrument aiming at stimulating environmentally beneficial product development through using the market forces. The Nordic Swan eco-labelling scheme has been in operation since 1989. LÄS MER

5. 14. Middle Ear Pressure; A New Method for Continuous Direct Measurements

   Författare :Bo Tideholm; allergi och livskvalitet Laryngoesofagologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Otorhinolaryngology; man; physiology; sleep; posture; pressure; patulous Eustachian tube; middle ear; Ear; audiology; auditive system and speech; Otorinolaryngologi; audiologi; hörsel- och talorganen;

   Sammanfattning : Disturbances in the pressure homeostasis of the middle ear (ME) system cause a pressure gradient across the tympanic membrane lessen the effectiveness of sound transmission and may be associated to development of chronic ME disease. An equipment for continuous direct pressure measurements was developed and was found to be accurate, base-line stabile and portable. LÄS MER

7. 15. Iridium Catalyzed Carbon- Heteroatom Bond Forming Reactions via Hydrogen Transfer : Method Development and Mechanistic Elucidations

   Författare :Aitor Bermejo López; Belén Martín‐Matute; Eduardo Peris; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Catalysis; N-Heterocyclic carbene; N-Alkylation; Hydrogen transfer; Amino acids; Carbohydrates; Amines; Organic Chemistry; organisk kemi;

   Sammanfattning : The present thesis describes the applicability of two different iridium(III) complexes for C-O and C-N bond forming reactions. The different projects described in this work are united by the use of an iridium catalyst bearing a functionalized N-heterocyclic carbene ligand. LÄS MER