Sökning: "hydrogen sensor"

Visar resultat 21 - 25 av 46 avhandlingar innehållade orden hydrogen sensor.

1. 21. Characterization of catalytic reactions on surfaces from three-dimensional partial pressure distributions

   Författare :Martin Johansson; Bengt Andersson; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : A chemical reaction taking place on a surface exposed to a viscous gas will give rise to a nonhomogeneous gas composition and temperature in the vicinity of the surface. This is due to the limited rate at which species and heat can be transported in the gas mixture by convection and diffusion. LÄS MER

3. 22. Materials design and characterization of the active regions of gas sensitive field-effect devices

   Författare :Anna Elisabeth Åbom; Udo Weimar; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : Metal-Insulator-Semiconductor (MIS) field-effect devices with catalytic metal layers are sensitive to several important gases, such as hydrogen, ammonia, hydrocarbons and alcohols. The gas sensitivity and selectivity depends on the properties of the active regions of the device. LÄS MER

4. 23. The Neutral Particle Detector on the Mars and Venus Express missions

   Författare :Alexander Grigoriev; Stas Barabash; Brian J. Anderson; Umeå universitet; []
   Nyckelord :Space and plasma physics; ENA imaging; exosphere; magnetosphere; Mars; Venus; solar wind interaction; Rymd- och plasmafysik; rymd- och plasmafysik; Space and Plasma Physics;

   Sammanfattning : The Neutral Particle Detector (NPD) is a new type of instrumentation for energetic neutral atom (ENA) diagnostics. This thesis deals with development of the NPD sensor designed as a part of the plasma and neutral particle packages ASPERA-3 and ASPERA-4 on board Mars Express and Venus Express, the European Space Agency (ESA) satellites to Mars and Venus, respectively. LÄS MER

5. 24. Synthesis of Nanoparticles and Organometallic Complexes for Gas Sensing

   Författare :Alicja Stolas; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanocube; LSPR; alloys; colloidal synthesis; organic synthesis; phthalocyanine complexes; gas sensing.; stabilizers; palladium; nanoparticles; phthalocyanine; nanocomposites; gold;

   Sammanfattning : Currently metal nanoparticles (NPs) are a subject of interest regarding many applications, in particular chemical gas sensing, as the associated environmental issues are of substantial importance. Metal NPs are attractive due to their fascinating optical properties and primarily, localized surface plasmon resonance (LSPR) which strongly depends on size and shape of NPs. LÄS MER

7. 25. Development and Characterisation of SiC Based Sensors for Harsh Environments

   Författare :Lars Unéus; Jacobus H. Visser; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The introduction of chemical gas sensors in our environment is a process that started many years ago. However, although the process has been rather slow over the years, the interest for chemical gas sensors is rising due to the growing environmental awareness. LÄS MER