Sökning: "Cavity forming"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden Cavity forming.

1. 1. Optical Guiding and Feedback in Gallium Nitride Based Vertical Cavity Surface Emitting Lasers

   Författare :Seyed Ehsan Hashemi; Chalmers University of Technology; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antiguiding; vertical-cavity surface-emitting laser; gallium nitride laser; TiO2 high contrast grating;

   Sammanfattning : The gallium-nitride (GaN) semiconductor material has been the core of the revolutionary breakthroughs during the last two decades in the lighting industry, by enabling manufacturing of efficient blue light emitting diodes (LEDs), for which the 2014 Nobel prize in physics was awarded. The GaN technology has further led to violet edge-emitting lasers (EELs), enabling the Blu-ray disk technology, and also to the commercialization of directly green emitting EELs. LÄS MER

3. 2. Investigations of Heat Transfer and Fluid Flow in the Pocket Region of a Gas Turbine Engine and Cooling of a Turbine Blade

   Författare :Jian Liu; Värmeöverföring; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pocket cavity; symmetric vane; Liquid Crystal Thermography; truncated ribs; staggered arrangement; perforated ribs; secondary flows; endwall film cooling; leading edge; turbine vane; coolant coverage;

   Sammanfattning : In the present work, heat transfer within gas turbine applications are investigated bothexperimentally and numerically. The main content concerns heat transfer and fluidflow over the pocket region and cooling of a turbine blade. LÄS MER

4. 3. Low Phase Noise GaN HEMT Oscillator Design based on High-Q resonators

   Författare :Mikael Hörberg; Chalmers University of Technology; []
   Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; resonator coupling; reflection oscillator; MMIC; phase noise; cavity resonator; low-frequency noise; GaN HEMT; MEMS;

   Sammanfattning : The thesis considers the design and optimization of oscillators targeting low phase noise, given boundary conditions from the technology. Crucial technology figures are power capability, RF noise figure, low-frequency noise and the quality factor (Q-factor) of the resonator. LÄS MER

5. 4. Oral dryness in relation to film-forming properties of saliva

   Författare :Christina Diogo Löfgren; Malmö högskola; []
   Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

   Sammanfattning : Dry mouth, or oral dryness, is a complex and quite commoncondition, reported with a varying prevalence of 10-80 %, expressed as a physiological deficiency with or without perceived dysfunction. This condition can severely affect oral health, oral function andquality of life. LÄS MER

7. 5. MM-wave integrated RF-MEMS tunable cavity resonators, filters and ultra-low phase-noise oscillators

   Författare :Dragos Dancila; Isabelle Huynen; Universite catholique de Louvain (UCL); []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Within the Microelectronics Industry, the core research is focused on the realization of the Moore's law, which states that circuit density doubles every 24 months, shaping the framework of the More of Moore paradigm. However, Moore's law is expected to end, as devices are reaching limitations inherent to the approach of the atomical dimensions. LÄS MER