Sökning: "Gunnar Hellström"

Visar resultat 6 - 10 av 21 avhandlingar innehållade orden Gunnar Hellström.

  1. 6. Modelling flow over rough surfaces in hydropower waterways

    Författare :Robin Andersson; Staffan Lundström; J. Gunnar I. Hellström; Patrik Andreasson; Jochen Aberle; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : .... LÄS MER

  3. 7. Effects of Orexins, Guanylins and Feeding on Duodenal Bicarbonate Secretion and Enterocyte Intracellular Signaling

    Författare :Magnus Wilhelm Bengtsson; Gunnar Flemström; Olof Nylander; Karl E. O. Åkerman; Per M. Hellström; Uppsala universitet; []
    Nyckelord :Physiology; alkaline secretion; carbohydrates; central nervous system; cholinergic stimulation; duodenum; enteric nervous system; enterochromaffin cell; fasting; feeding; glucose; guanylyl cyclase C; humans; hypocretin; intra-arterial; in situ; intracerebroventricular; luminal acid; luzindole; orexin-B; SB-334867; Fysiologi;

    Sammanfattning : The duodenal epithelium secretes bicarbonate ions and this is regarded as the primary defence mechanism against the acid discharged from the stomach. For an efficient protection, the duodenum must also function as a sensory organ identifying luminal factors. LÄS MER

  4. 8. Laser Based Flow Measurements to Evaluate Hydraulic Conditions for Migrating Fish and Benthic Fauna

    Författare :S M Sayeed Bin Asad; Staffan Lundström; J. Gunnar I. Hellström; Anders G. Andersson; Berhanu Mulu Geberkiden; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fish Migration; Step Cylinder; Shedding; Vortex Street; Shear stress; PIV; benthic fauna; river; stones; Strömningslära; Fluid Mechanics;

    Sammanfattning : Hydropower is one of the main sources for Sweden’s energy, which is clean and renewable. It is a clean energy source because no fuels are burned which does not pollute the air and it is a renewable energy source as it only uses natural water cycle for generating energy. LÄS MER

  5. 9. Hydraulic Modelling of Dynamics in Regulated Rivers

    Författare :Anton Burman; J. Gunnar I. Hellström; Knut Alfredsen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : The Nordic countries hold a significant portion of the European hydropower production. One advantage of hydropower is its ability to store water in reservoirs in times when the energy demand is low. LÄS MER

  7. 10. Hydraulic Modelling of Hydropeaking in Regulated Rivers

    Författare :Anton Burman; J. Gunnar I. Hellström; Anders G. Andersson; Ana Margarida Ferreira Teixeira da Silva; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : The role of hydropower is expected to change in the close future in the Nordic countries. In order to fulfill targets set by the Paris agreement, the reliance on low emission intermittent power production such as solar and wind power is likely to increase. LÄS MER