Search for dissertations about: "free thesis on water"

Showing result 1 - 5 of 452 swedish dissertations containing the words free thesis on water.

  1. 1. Water diffusion and free volume in hydrophilic polymers

    Author : Charlotte Trotzig; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; free volume; self-diffusion; degree of crystallinity; glass transition temperature; tensile storage modulus; surface tension; isotherm; HPMC; PEO; water; triacetin; clay; Macromolecular chemistry; dynamic mechanical analysis; Fysikalisk kemi; differential scanning calorimetry; nuclear magnetic resonance; positron annihilation; Makromolekylär kemi;

    Abstract : During moisture uptake in polymers, the diffusion of the water molecules is believed to occur via unoccupied voids. These voids are called free volume cavities and their sizes are continuously altered when the moisture content in the polymer is enhanced. READ MORE

  2. 2. The cost of free water : Water resources allocation and use in the Curu Valley, Ceará, northeast Brazil

    Author : Karin Kemper; Linköpings universitet; []
    Keywords : SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Abstract : Despite enormous investments in water storage infrastructure over past decades, the Curu Valley in the semi-arid state of Ceara, Northeast Brazil, is subject to increasing water stress. This study explains the current situation in the valley and explores institutional alternatives for the achievement of more efficient water resources allocation and use. READ MORE

  3. 3. Influence of ice-cover on local scour at circular bridge piers : an experimental study

    Author : Peter Olsson; Luleå tekniska universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Abstract : The objective of this work has been to investigate the effect of a simulated ice cover on the local scour depth around a cylindrical pier. Experiments were performed in a laboratory flume for different flow velocities with both a smooth and rough cover. The bed material consisted of uniform ripple-forming sand. READ MORE

  4. 4. Influence of fractures and air bubbles on the pressure distribution embankment dams

    Author : Mats Billstein; Luleå tekniska universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Abstract : In some large embankment dams unexpected pore pressure distributions within the core have been observed. As an example, the piezometer pressures in WAC Bennett Dam, Canada, which rose for about four years after the reservoir was filled, were steady for two years and subsequently declined. READ MORE

  5. 5. On-chip terahertz characterisation of liquids

    Author : Juan Cabello Sánchez; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; terahertz spectroscopy; dielectric permittivity; water; liquids; isopropyl alcohol IPA ; coplanar waveguides CPW ; Chip; vector network analyzers VNA ; Through-Reflect-Line TRL calibration; planar Goubau line; on-wafer measurements; microfluidic channels; material properties; scattering parameters;

    Abstract : Abstract: Spectroscopy at terahertz frequencies can be used in a wide range of applications including radio-astronomy, pharmaceutical manufacturing control, and the study of processes in molecular biology. Biomolecular samples should preferably be studied in their native environment, water, however, water poses extreme attenuation for THz-frequency waves, deteriorating or even impeding analysis using these waves. READ MORE