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In diesem Beitrag werden die Möglichkeiten des robotischen 3D‐Drucks mit Stahl (WAAM – Wire and Arc Additive Manufacturing) in der Bauindustrie untersucht. Ziel des Projektteams ist es, ein stabiles und wirtschaftliches Herstellungsverfahren für individuelle Stahlbauelemente zu entwickeln. So wird der Einfluss verschiedener Prozessparameter wie Drahtvorschubgeschwindigkeit und Fahrgeschwindigkeit...
Verformungsempfindliche Tragwerke benötigen wesentliche Anteile ihres Materials zur gezielten Erhöhung der Steifigkeit hinsichtlich verformungskritischer Punkte, wie z. B. die Feldmitte bei Brückentragwerken oder der Kopfpunkt bei Hochhaustragwerken. Insbesondere bei komplexen Strukturen stößt eine nur händische vorgenommene Optimierung solcher Tragwerke schnell an ihre Grenzen. Die hier angewandte...
Abstract A 60‐year‐old male being treated for chronic venous stasis ulcers presented with an asymptomatic pulmonary artery aneurysm involving the main pulmonary trunk and extending into both pulmonary arteries. He underwent successful resection of the aneurysm, and his chronic ulcerations recovered spontaneously. Surgical treatment of pulmonary artery aneurysm could be found in reports from Wilms and Sauerbruch dating from the early twenties of the last century. In 1950, Blades et al. reported a ligation of an aneurysmatic pulmonary artery with lung resection. However, the role of surgery in main pulmonary artery aneurysms is still not well defined....
Numerous studies have dealt with the occurrence of dendritic cells in various nonlymphoid organs such as kidney, liver or heart, whereas lymphocyte patterns in these organs have not been analyzed in detail. In the present study, leukocytes were quantified as cells/mm 2 in the perivascular, interstitial and parenchymal tissue sections of normal heart. We measured an overall mean leukocyte...
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