Search for dissertations about: "Hugo Nguyen"

Found 5 swedish dissertations containing the words Hugo Nguyen.

2. 1. Microsystem Interfaces for Space

   Author : Hugo Nguyen; Greger Thornell; Johan Köhler; Staffan Greek; Uppsala universitet; []
   Keywords : Engineering physics; microelectromechanical system; interface; microfluidics; nanosatellite; space; microsystems; filter; valve; MST; MEMS; Teknisk fysik;

   Abstract : Microsystem interfaces to the macroscopic surroundings and within the microsystems themselves are formidable challenges that this thesis makes an effort to overcome, specifically for enabling a spacecraft based entirely on microsystems. The NanoSpace-1 nanospacecraft is a full-fledged satellite design with mass below 10 kg. READ MORE

4. 2. Microfabricated Gas Sensors Based on Hydrothermally Grown 1-D ZnO Nanostructures

   Author : Mingzhi Jiao; Hugo Nguyen; Klas Hjort; Anita Lloyd Spetz; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gas sensor; zinc oxide; on-chip; hydrothermal growth; nanorods; nanowires; annealing; palladium oxide; photoluminescence; alloy; sensitivity; selectivity; stability;

   Abstract : In this thesis, gas sensors based on on-chip hydrothermally grown 1-D zinc oxide (ZnO) nanostructures are presented, to improve the sensitivity, selectivity, and stability of the gas sensors.Metal-oxide-semiconductor (MOS) gas sensors are well-established tools for the monitoring of air quality indoors and outdoors. READ MORE

5. 3. Microsystems Technology for Underwater Vehicle Applications

   Author : Jonas Jonsson; Greger Thornell; Hugo Nguyen; Johan Köhler; Uppsala universitet; []
   Keywords : Aquatic; Submersible; Underwater; Micro; Miniaturized; Sonar; Sidescan; Topography; Laser; Diffractive; Optics; Sampler; Particle; Microorganism; Acoustic; Enriching; Conductivity; Temperature; Depth; CTD; Flow; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

   Abstract : The aim of this thesis work has been to investigate how miniaturization, such as microsystems technology, can potentially increase the scientific throughput in exploration of hard-to-reach underwater environments, such as the subglacial lakes of Antarctica, or other challenging environments, including cave systems and wrecks. A number of instruments and subsystems applicable to miniature submersibles have been developed and studied, and their potential to provide a high functionality density for size-restricted exploration platforms has been assessed. READ MORE

6. 4. Development of Microcomponents for Attitude and Communication Systems on Small Vehicles in Space and Extreme Environments

   Author : Kristoffer Palmer; Greger Thornell; Hugo Nguyen; Henrik Kratz; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Administrative Law; Förvaltningsrätt;

   Abstract : In this thesis, components intended for vehicles in space and other extreme environments have been realized using microsystems technology to facilitate miniaturized, yet high-performing systems beneficial for small spacecraft and other vehicles with limited size and power.Cold gas thrusters commonly used on spacecraft basically accelerate a gaseous propellant stored under high pressure. READ MORE

7. 5. Magnetoresistance and Space : Micro- and Nanofeature Sensors Designed, Manufactured and Evaluated for Space Magnetic Field Investigations

   Author : Anders Persson; Hugo Nguyen; Greger Thornell; Johan Åkerman; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tunneling Magnetoresistance; Planar Hall effect; Magnetic tunnel junction; Magnetometer; Materials science; Teknisk materialvetenskap; Engineering physics; Teknisk fysik; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

   Abstract : In recent years, the interest for miniaturization of spaceborne instruments and subsystems has increased steadily, as this enables development of small and lightweight satellite classes as well as more versatile payloads on traditional spacecraft. In essence, this thesis work is an investigation of the applicability of magnetoresistive technology to a magnetometer intended for space. READ MORE