For the treatment of severe symptomatic aortic valve stenosis, minimally invasive heart valve prostheses are increasingly used, especially for elderly patients.The current generation of devices is based on xenogenic leaflet Necklace material, involving limitations with regard to calcification and durability.Artificial polymeric leaflet-structures r
An alternative method is devised for calculating dynamic stability maps in cylindrical and centerless infeed grinding processes.The method is based on the application of the Floquet theorem by repeated time integrations.Without the need of building the transition matrix, this is the most efficient calculation in terms of computation effort compared
Rupture disk corrosion test (RDCT) method has been recently developed for real-time measurement of initiation of stress corrosion cracking (SCC) in a high-temperature water.This work presents a parametric study on the stress distribution of a thin disk specimen of RDCT to consider the fixture shape and friction using finite element analysis (FEA).T
Natural calamities (especially windthrows) Beginner+ may generate difficult work conditions in timber harvesting operations.When associated with the reduced accessibility conditions, the work conditions become even harder.This study investigates the time consumptions on specific work elements in timber skidding, develops time prediction models for
Introduction: Alcohol use is responsible for a high level of mortality Iced Cup Coolie and morbidity throughout the world.The WHO global strategy recommends that the detrimental effects of alcohol use be reduced.Aims: The objective of this paper was to investigate, using data from the 2010 Togo STEPS survey, alcohol use and other health-related fac