Sökning: "head losses"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden head losses.

1. 1. Development of the pressure-time method: final integration point and head losses

   Författare :Mehrdad Kalantar Neyestanaki; Michel Cervantes; Jonathan Nicolle; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Pressure-time method; head loss calculation; endpoint determination; Strömningslära; Fluid Mechanics;

   Sammanfattning : Hydropower is an efficient renewable energy source able to regulate electrical grid fluctuations. However, many hydropower plants were built decades ago, and now it is the time for a major refurbishment. The turbine's efficiency is essential and needs to be determined before and after refurbishment. LÄS MER

3. 2. Numerical investigation of the flow and instabilities at part-load and speed-no-load in an axial turbine

   Författare :Jelle Kranenbarg; Michel Cervantes; Lisa Prahl Wittberg; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Speed-no-load; vortical flow structures; flow instabilities; rotating stall; mitigation; independent guide vanes; axial turbine; swirling flow; off design operation; URANS; parametric study; blade clearance; head losses; diffusor; GEKO model; flow separation; hydraulic turbine; Strömningslära; Fluid Mechanics;

   Sammanfattning : Global renewable energy requirements rapidly increase with the transition to a fossil-free society. As a result, intermittent energy resources, such as wind- and solar power, have become increasingly popular. However, their energy production varies over time, both in the short- and long term. LÄS MER

4. 3. Patients with head and neck cancer : aspects on treatment, complications and rehabilitation

   Författare :Alexander Ahlberg; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Head and neck cancer is reported to be the fifth most common cancer globally and around 1,200 new patients are diagnosed in Sweden every year. Historically, survival rates have been rather constant but have started to improve over the last few decades as a result of new and more aggressive oncological treatments. LÄS MER

5. 4. The conflict between Grey seals (Halichoerus grypus) and the Baltic coastal fisheries : new methods for the assessment and reduction of catch losses and gear damage

   Författare :Arne Fjälling; Mats Amundin; Sverre Sjölander; Anders Fernö; Linköpings universitet; []
   Nyckelord :Ecology; Grey seals; Baltic coastal fisheries; Ekologi; NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : There is a problematic interaction going on between grey seals and the small scale coastal fisheries in the Baltic. A large number of seals are by-caught and drowned each year, and the viability of the fishery is threatened by catch losses caused by the seals. LÄS MER

7. 5. Glutamine to ICU patients

   Författare :Agneta Berg; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Intravenous glutamine supplementation to intensive care patients using a glutamine containing dipeptide is now widely accepted in clinical practice. There are evidences that glutamine supplementation of ICU patients in need of parenteral nutrition improves mortality and morbidity. LÄS MER