The article presents selected modern 3D technologies (a motion capture system, forceplates) that can be used to examine the biomechanics of motorsports drivers. The aim of this paper is to prove the following thesis:“modern 3D technologies allow for precise and objective biome-chanical analysis of motorsports drivers as a complement to psychomotor tests” based on the preliminary research. Three motorsports drivers participated in this study.

Stress analysis obtained from CAE methods is one of the most important parameter of designing parts, assemblies and constructions. Loads and stress limits applied on the model should be known also for better design procedure. Evaluation of all parameters is known as optimization. Designed model should contain the optimum values of each parameters such as loads, stresses and weight. Designer creates the model using optimized values for better products. In this paper, Computer Aided Engineering Design Optimization process is studied experimentally with CATIA Product Engineering Optimizer module and optimization algorithms within limitations are used. Benefits of the optimization procedure is also evaluated. Optimization process and benefits are presented in an example of I profile cantilever beam with a length of 2000 mm.

The paper describes the process of symmetric bending of an aluminium specimen using two independent environments for numerical analysis. A FEM analysis is performed on an aluminium channel section. A comparison is made between the bending process performed in the Abaqus environment and that run with the Deform-3D system. In both numerical analysis systems, the crucial point is to determine the state of reduced stresses for a designed computer model. The paper provides a visual comparison of the profiles subjected to bending; it also determines displacements and stresses in the tested structures. To perform a nonlinear static analysis, we define a material model, determine boundary conditions, interactions as well as generate a mesh. The results produced with the two numerical systems agree to a very high extent.

Creating a simplified worm wheel profile leads to approximating it through the use of sections. The worm gear notch created through approximation is inaccurate and does not ensure proper meshing. However, this method is commonly exploited because of economic reasons such as the use of universal milling machines and tools. In summary, machining worm wheel teeth with a simplified tooth profile is less complex thus less time consuming.

This paper is a cross-sectional study on the use of Internet and Online Social Networks in the Spanish hotel sector compared to Spanish companies in other sectors. The conclusions from this extensive survey are that the use of online social networks is more important and is more developed in the hotel sector than in Spanish companies in general. However, although it gives considerable importance to online social networks, the hotel sector needs to revise its rules of usage. The use of new tools such as e-commerce to sell the hotel stays must increase, and marketing efforts should be geared more towards online social networks because the hotel sector is currently losing ground in a market that generates more and more potential clients and sales by the day.