9 articles in this issue
Csaba Bazsó, Csaba Hos
This paper focuses on flow induced static instabilities occurring in poppet valves. Computational fluid dynamics simulation were performed to gain static characteristics of the poppet valve and to demonstrate the unstable behaviour of the valve. Based on ... see more
András Szekeres, Balázs Fekete
Starting from the basic equations of solids we have shown one possible construction of the modification method of the law of heat conduction. Based on this method the steps of development can be outlined, the sequence and role of the tasks can be establis... see more
István Biró, Miklós Czampa, Tibor Szalay
Machining and more specifically face milling are productive ways of material shaping. Predictive models are very important for effective: quick, easy-to-use and accurate process planning. There are many industrial and scientific researches about modelling... see more
Qinglin Chang, Li Hou, Bo Li, Fenglan Jia
In this paper, the forming principle, meshing features and tooth surface equation were introduced. And the modal parameters distribution of cylindrical gears with arcuate tooth trace was researched. The results show: 1. The modulus was the biggest impact ... see more
Péter Nagy
Balloon expandable stents can be used to treat coronary stenosis. During stent implantation, X-ray imaging is used. In order to assist the doctors, it was decided to improve the cardiovascular stents’ X-ray absorption ability by placing a unique marker in... see more
Ádám Thiele, Jirí Hošek
Ductility, toughness and strength of medieval bloomery iron materials were highly important mechanical properties, strongly affected by their microstructure and chemical composition. An attempt was made to characterize the most important mechanical proper... see more
Liza Pelyhe, Eszter Bognár
In this study, an easy to use measurement method was developed to quantify the balloon dilatation catheters visibility, thus making them comparable. The visibility of the distal and proximal markers and the balloon (average values of the markers) was dete... see more
István Bagi, Sándor Olasz
One of the most wide-spread illnesses of our age is osteoporosis at elder age (senilis osteoporosis), and as a consequence, the frequent hip fracture. In case of fracture of the neck of the femur a common way of the successful rehabilitation of the injure... see more
Gyula Béda, Péter B. Béda
In forming constitutive relations a method of Mindlin was used. By introducing the conditional Lagrange derivative and by using the laws of thermodynamics a formula is obtained for e. In the first law Gibbs function is used. This formula should be s... see more