Sökning: "frequencies"

Visar resultat 1 - 5 av 1382 avhandlingar innehållade ordet frequencies.

1. 1. Sound Insulation at Low Frequencies

   Författare :Andrzej Pietrzyk; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Element Method; numerical simulations; Modal Approach; sound insulation; sound reduction index; low frequency; building partitions;

   Sammanfattning : The airborne sound transmission through building partitions at low frequencies was studied. The definition of the sound reduction index as a measure of sound insulation has been examined by means of extensive numerical simulations in 3-D domains. The simulations were based on the wave theoretical acoustics. LÄS MER

3. 2. La spécificité de la métaphore journalistique : Analyses thématique, comparative et distributive

   Författare :Gunilla von Malmborg; Inge Bartning; Pierre Fiala; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; metaphor; newspapers; metaphorizing terms; generic fields; categories of metaphorized terms; frequencies; syntax; distribution; argumentative strategies; fiction; French language; Franska språket;

   Sammanfattning : The use of metaphors is one of main elements distinguishing the styles of Le Monde and L’Express. The main purpose of this thesis is to show in detail how their respective uses of metaphors differ. LÄS MER

4. 3. Advanced MEMS Technology for Terahertz Frequencies

   Författare :Zhao Xinghai; Joachim Oberhammer; Umer Shah; Oleksandr Glubokov; Jan Stake; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : With the development of terahertz (THz) technology, a variety of application demands are growing rapidly, such as high-rate communications, THz radars, environmental monitoring, medical imaging, and space exploration. However, the fabrication, integration, and packaging techniques for THz components and systems pose great challenges for a large-scale, cost-effective production. LÄS MER

5. 4. Water content measurement in woody biomass : using dielectric constant at radio frequencies

   Författare :Ana Marta Marques Duarte da Paz; Erik Dahquist; Pertti Vainikainen; Mälardalens högskola; []
   Nyckelord :Energi- och miljöteknik;

   Sammanfattning : The will for replacement of fossil fuels increased the use of woody biomass as fuel in heating and power plants. An important parameter for the use woody biomass as fuel is the water content of biomass as it influences the heating value and thereby the combustion control and pricing. LÄS MER

7. 5. Nanostructured electromagnetic metasurfaces at optical frequencies

   Författare :Nils Odebo Länk; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; high-index nanophotonics; colloidal lithography; metasurfaces; geometric resonances; nanostructures; plasmonics;

   Sammanfattning : Electromagnetic metasurfaces are broadly defined as optically thin layersthat are structured on the subwavelength scale. In general, metasurfacesthus consist of nanoparticles, or other kinds of ”meta-atom”, arranged insome pattern where both the individual particle sizes and the inter-particledistances are much smaller than the wavelength. LÄS MER