Search
Search Results
-
Sealing Performance of Beam Tube Flange Connections Under Internal Pressure and External Bending Loads
52-70Views:185Pipe flange connections are critical components in nuclear and petrochemical facilities, where reliable sealing and structural integrity are essential for safe operation. In research on open-pool reactors, ion beam tubes represent a specialized application of flange-connected pressure boundaries. This study investigated the structural response and sealing performance of a beam tube–flange assembly using three-dimensional nonlinear finite element analysis. The beam tube was evaluated under two operating conditions: an empty configuration and a configuration subjected to externally applied mechanical loads. Stress analysis indicated that the maximum Von Mises stress in the beam tube remained well below the material yield strength and satisfied the design deformation limit of 3 mm for both loading scenarios. Sealing performance assessment of the flange joint showed a bolt stress variation of 23 MPa, which remained within acceptable design limits. The corresponding gasket stress variation was 0.49 MPa, with maximum and minimum gasket stresses were within the recommended operating range of 1.4–8 MPa. Time-dependent analysis revealed gasket stress relaxation of 3.5% for the empty beam tube and 3.78% for the externally loaded case. The finite element results were validated using analytical models, demonstrating good agreement with discrepancies ranging from 0.01% to 5.8%. The findings confirmed the structural adequacy and sealing reliability of the beam tube–flange assembly under the investigated operating conditions, providing a robust basis for safe design and operation in research reactor applications.
-
Studies on Consumer Motivation Among Users Of Fitness Services
442-453Views:516The rate of inactivity experienced world-wide is the cause of numerous health problems. The sedentary lifestyle of the population represents a great burden to a nation’s economy. The health indicators of Hungary are below the European average, not only those concerning physical activity, but also with respect to smoking, nutrition, and alcohol consumption [1]. In 2013, only 38% of the Hungarian population exercised regularly, while 62% rarely or never [2]. The diseases associated with inactivity represent a higher burden to the economy than the costs of raising the level of activity would be [3]. Based on previous studies, the motivating factors for leisure athletes in Hungary are the preservation of health, to increase physical strength, relaxation, recreation, the love of exercising, and stress management [4; 5]. The sports facilities available to a wide range of people, the fitness clubs offer the possibility to join regular sports activities, which is why it is necessary to examine the motivation behind the participation of athletes taking part in the trainings provided by fitness facilities. Many previous studies examined the goals of athletes and the motivational factors behind exercising, and came to the conclusion that trainings held in fitness rooms and at home are related to intrinsic motivational factors, while taking part in other sports activities are related to intrinsic motivational factors [6; 7]. The focus of my study are leisure athletes using the services provided by fitness clubs (753 people), of whom I evaluated the motivational factors behind taking part in trainings. The results show that the motivational factors driving consumers of fitness services show a ranking that is identical to those of other leisure athletes, with most of them taking part in fitness trainings in order to preserve their health, to improve physical strength, and for recreational purposes, while the improvement of physical appearance also plays an important role.
-
The presence of stress and leisure sports in the life of today’s people
74-86Views:1044Today's people are extremely busy with a lot of things, such as work, family, learning, so they try to spend their free time with activities that promote them in relaxation, reassurance, recreation. It can be said that the people of today's world are burdened, more stressed and nervous, trying to do the best they can to live properly. A lot of people have a hard time communicating, community life. There are a lot of people who are forced to work from home, as projects and weeks' deadlines don't wait. Besides, there are many things to be done, children need to be dealt with, you have to have fun, you have to pay attention to health, you have to run a household, etc., so there is little time for people to do what they really love. In my research, I assessed the leisure habits of the inhabitants of Romania and Hungary, but their attitude to active reclamation activities (N=273) was their activity in sport. The results show that passive leisure activities (watching TV, reading, listening to music, internet) are still the most popular among people, although most of us do sedentary work. People who play sports in their spare time felt more refreshed, and they had a better mood, more positive. The sports that people can play outdoors and in parks come to the fore.
