Sökning: "valve resistance"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden valve resistance.

1. 1. Valve-less diffuser micropumps

   Författare :Anders Olsson; KTH; []
   Nyckelord :;

   Sammanfattning : Today there is growing interest in research on microfluidicsystems, e.g., for chemical analysis systems and microdosagesystems. One of the basic components in microfluidic systems ismicropumps. LÄS MER

3. 2. Aortic valve surgery: Clinical studies after autograft, homograft and prosthetic valve replacement

   Författare :Obaid Aljassim; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Aortic valve surgery; Ross operation; Homograft; Doppler-Catheter gradients;

   Sammanfattning : Aortic Valve Surgery Clinical studies after autograft, homograft and prosthetic valve replacement Obaid Aljassim, MD Department of Cardiovascular Surgery and Anaesthesia, Sahlgrenska University Hospital and University of Gothenburg Introduction and Aims: Aortic valve disease in symptomatic adult patients often requires surgery. Several alternatives are available: repair, mechanical and biological prostheses, homograft and the Ross procedure. LÄS MER

4. 3. Protective Tribofilms on Combustion Engine Valves

   Författare :Robin Elo; Staffan Jacobson; Mikael Åstrand; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Internal combustion engine; valve; sealing surface; tribofilm; oil residue; test rig; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

   Sammanfattning : Inside the complex machinery of modern heavy-duty engines, the sealing surfaces of the valve and valve seat insert have to endure. Right next to the combustion, temperatures are high and high pressure deforms the components, causing a small relative motion in the interface. LÄS MER

5. 4. Molecular epidemiology of coagulase-negative staphylococci in hospitals and in the community

   Författare :Micael Widerström; Johan Wiström; Tor Monsen; Anders Sjöstedt; Bo Söderquist; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; staphylococcus epidermidis; staphylococcus saprophyticus; electrophoresis; gel; pulsed-field; genetic diversity; methicillin-resistance; UTI; drug resistance; multiple; bacterial; epidemiology; molecular; cross infection; molecular sequence data; Medical microbiology; Medicinsk mikrobiologi; Clinical bacteriology; Klinisk bakteriologi; Infectious diseases; Infektionssjukdomar; Clinical Bacteriology; klinisk bakteriologi; mikrobiologi; Microbiology; Infectious Diseases; infektionssjukdomar;

   Sammanfattning : Background Coagulase-negative staphylococci (CoNS) and in particular Staphylococcus epidermidis have emerged as major pathogens primarily causing nosocomial infections in patients with indwelling medical devices. These infections are often caused by multidrug-resistant strains of S. epidermidis (MDRSE). LÄS MER

7. 5. Noninvasive haemodynamic evaluation of aortic valve prostheses : Doppler echocardiographic studies at rest and during exercise

   Författare :Maria J Eriksson; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :heart valve prosthesis; aortic valve replacement; Doppler echocardiography; exercise; haemodynamics; valve resistance;

   Sammanfattning : The present series of investigations was designed to supply information on in vivo pressure-flow relationships and to analyse the incidence of regurgitation in different heart valve prostheses in the aortic position. Patients and methods: The study population comprised 185 patients with mechanical Björk-Shiley Monostrut prostheses, 54 patients with Biocor stented porcine bioprostheses, 50 patients with extended Biocor stentless bioprostheses and 59 patients with cryopreserved aortic homografts. LÄS MER