Abstract

The proliferation of mobile devices and their use by children of all ages raise issues among families and educators with regard to their quality and appropriateness. Given the absence of an industry standard or an official ratings system for children’s apps, specialist websites or blogs are frequently consulted when choosing apps. This article presents the results of a content analysis of the visual and interaction design features of 100 educational applications recommended by international experts for children from six months to eight years old. In addition, the adaptability of an application’s content to children was taken into account as a qualitative measurement. Four researchers participated in the definition of variables and the design of the observation instrument. This study focuses on child-computer interaction (HCI-CCI) from a pedagogical and developmental perspective, with the aim of discovering and promoting quality in mobile applications for children. The intention is to provide information on key criteria related to the design of applications for entertainment and learning. The results of the statistical analysis indicate a generally low-quality visual and interaction design in the sample group and content that mirrors problems in the school curriculum. Even applications with both content and design that are specifically targeted at children reveal issues that may impede user comprehension and interaction.

Abstract

From a position of structural and power theory of friction and wear, it is possible to apply the method of Contact Electrical Resistance (CER) for a complex research of the processes in a-zone of frictional contact. The purpose of this paper is to present a construction of friction node and drive mechanism of friction machine. As a result of the reported study the regularities of changes the CER and tribomechanical indices for non-metal friction couples in dependence on loading parameters and lubricating media were received. Also, the method of determination the range and level of normal wear and critical points of transmission to damage in accordance with kinetics of wear changes is proposed. The interrelation between geometrical, physical and mechanical properties, processes of formation, transformation and destruction of secondary structures, tribotechnical indices and CER in dependence on operation regimes of friction couples.