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Wyświetlanie 1-2 z 2
Tytuł:
Numerical model of the axial magnetic bearing with six cylindrical poles
Autorzy:
Sikora, Bartłomiej Marian
Pilat, Adam Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/141281.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Active Magnetic Bearing
Axial Magnetic Bearing
Finite Element Method
numerical model
COMSOL Multiphysics
Opis:
The paper presents a numerical model of the novel design of the axial magnetic bearing with six cylindrical poles. The motivation behind this idea was to eliminate vibra- tions in rotating machinery due to the axial load. Common conception of such a bearing provides a single component of the electromagnetic force, which is not enough to reduce transverse and lateral vibrations of the armature. The proposed design allows for avoiding wobbling of the disc with the use of a few axial force components that are able to actively compensate the axial load and stabilise the disc in a balanced position. Before a real device is manufactured, a virtual prototype should be prepared. The accurate numerical model will provide essential knowledge about the performance of the axial magnetic bearing.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 195-208
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma magnesium concentration in patients undergoing coronary artery bypass grafting
Autorzy:
Kotlinska-Hasiec, Edyta
Makara-Studzinska, Marta
Czajkowski, Marek
Rzecki, Ziemowit
Olszewski, Krzysztof
Stadnik, Adam
Piłat, Jacek
Rybojad, Beata
Dąbrowski, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/989882.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
magnesium
supplementation
age
profession
community education
Opis:
Introduction. Magnesium (Mg) plays a crucial role in cell physiology and its deficiency may cause many disorders which often require intensive treatment. The aim of this study was to analyse some factors affecting preoperative plasma Mg concentration in patients undergoing coronary artery bypass grafting (CABG). Materials and method. Adult patients scheduled for elective CABG with cardio-pulmonary bypass (CPB) under general anaesthesia were studied. Plasma Mg concentration was analysed before surgery in accordance with age, domicile, profession, tobacco smoking and preoperative Mg supplementation. Blood samples were obtained from the radial artery just before the administration of anaesthesia. Results. 150 patients were studied. Mean preoperative plasma Mg concentration was 0.93 ± 0.17 mmol/L; mean concentration in patients – 1.02 ± 0.16; preoperative Mg supplementation was significantly higher than in patients without such supplementation. Moreover, intellectual workers supplemented Mg more frequently and had higher plasma Mg concentration than physical workers. Plasma Mg concentration decreases in elderly patients. Patients living in cities, on average, had the highest plasma Mg concentration. Smokers had significantly lower plasma Mg concentration than non smokers. Conclusions. 1. Preoperative magnesium supplementation increases its plasma concentration. 2. Intellectual workers frequently supplement magnesium. 3. Smoking cigarettes decreases plasma magnesium concentration.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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