Sökning: "blockage"

Visar resultat 21 - 25 av 109 avhandlingar innehållade ordet blockage.

1. 21. Deposition and absorption of inhaled drugs

   Författare :Eva Bondesson; Malmö Klinisk fysiologi och nuklearmedicin; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; tomografi; radiologi; Klinisk fysiologi; medical instrumentation; tomography; radiology; Clinical physics; technetium-99m; radionuclide imaging; radioactive aerosol; powder inhaler; pharmacokinetics; mucociliary clearance; lung deposition; gamma scintigraphy; inhalation; deposition modelling; drug absorption; absorption enhancer; aerosol; medicinsk instrumentering; Physiology; Fysiologi;

   Sammanfattning : Main objectives of this thesis were to evaluate a gamma scintigraphic method used to quantify drug aerosol deposition in the lung, to investigate the influence of two aerosol inhalation parameters on the distribution of inhaled dry powder within the airways, to assess pulmonary absorption kinetics and bioavailability of an inhaled hydrophilic solute in relation to site of deposition, and to assess the influence of a surface active agent (sodium taurocholate, a bile salt) on the deposition and absorption of an inhaled hydrophilic solute. Repeated planar gamma scintigraphy was found to provide the same information on total pulmonary drug deposition as an independent method that involved assessments of urinary drug recovery after blockage of gastrointestinal drug absorption when all of the critical parts of the methodological procedures were accurately and meticulously executed. LÄS MER

3. 22. Molecular mechanisms for lineage-restricted differentiation of adult neural progenitors

   Författare :Muna Elmi; Göteborgs universitet; []
   Nyckelord :;

   Sammanfattning : Aims: In the central nervous system of several species, including humans, neurogenesis per?sists even in the adult life in discrete neurogenic regions of the brain. Adult neural stem cells derived from these neurogenic areas are proliferating cells, which can differentiate to neurons, astrocytes, and oligodendrocytes. LÄS MER

4. 23. Experimental Investigations of Heat Transfer in a Channel with Ribs and Obstacle

   Författare :Zahra Ghorbani-Tari; Värmeöverföring; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Liquid crystal thermography; ribs; entrance region; control the heat transfer around an obstacle by rib;

   Sammanfattning : This thesis presents experimental investigations of local heat transfer in a rectangular channel (aspect ratio AR = 4) with continuous transverse ribs as well as an obstacle. Liquid crystal thermography (LCT) is employed to obtain the temperature fields in the heat transfer experiments. LÄS MER

5. 24. Performance Aspects in Millimeter-Wave Wireless  Networks

   Författare :Cristian Tatino; Di Yuan; Nikolaos Pappas; Ilaria Malanchini; Ewe Lutz; Marian Codreanu; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The ever-growing data rate and comunications demand pose more challenges for the upcoming generations of mobile communications, i.e., fifth generation (5G) and beyond. To deal with these challenges, several solutions can be deployed, e. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER