Sökning: "Wood Physics"

Visar resultat 16 - 20 av 49 avhandlingar innehållade orden Wood Physics.

1. 16. A Method for Dispersive Split Hopkinson Pressure Bar Analysis Applied to High Strain Rate Testing of Spruce Wood

   Författare :Svante Widehammar; Karl-Gustav Sundin; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; split Hopkinson; wave propagation; dispersion; Hamilton s principle; strain rate; calibration; spruce; wood; Materialvetenskap; Materials science; Teknisk materialvetenskap; teknisk fysik med inriktning mot hållfasthetslära; Technical Physics;

   Sammanfattning : En metod för dispersiv analys av försök med delad hopkinsonstång tillämpad på provning av granved vid hög töjningshastighetSyftet var att etablera en metod för att studera sambandet mellan spänning och töjning för granved vid hög töjningshastighet. Detta åstadkoms genom att anpassa och något vidareutveckla tekniken med delad hopkinsonstång ("Split Hopkinson Pressure Bar", SHPB). LÄS MER

3. 17. Heating and drying wood using microwave power

   Författare :Lena Antti; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood Physics; Träfysik;

   Sammanfattning : The potentials for moisture flux in wood during microwave heating have been investigated experimentally and theoretically. The experiments were performed in three different kinds of microwave applicators. A computer model based on the finite difference method was developed to describe and predict the heat and mass transfer. LÄS MER

4. 18. Moisture content measurement in the wood industry

   Författare :Tommy Vikberg; Björn Källander; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood Physics; Träfysik;

   Sammanfattning : In the wood industry, determination of the moisture content (mc) with a highaccuracy is of great importance. The green mc is important for optimisation of thewood drying process at sawmills, whereas the mc of dried boards is of interest for thefurther processing and final use of the boards. LÄS MER

5. 19. Physicochemical properties and atmospheric ageing of soot - investigated though aerosol mass spectrometry

   Författare :Axel Eriksson; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Black carbon; soot; vehicle exhausts; wood stove emissions; atmospheric processing; SP-AMS;

   Sammanfattning : Aerosol particles contribute significantly to the global burden of disease, and remain the main source of uncertainty in assessments of human-induced climate change. The microphysical characterization of particles is necessary to understand the roles they play in the detrimental effects of air pollution on human health, and in the energy budget of our planet. LÄS MER

7. 20. X-ray CT-scanning of wood during drying

   Författare :Pär Wiberg; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träfysik; Wood Physics;

   Sammanfattning : Moisture flux in wood during drying was studied using a medical CT scanner. A special device was built that enables performance of nondestructive measurements without removing the test piece during the whole drying process. LÄS MER