Abstract:The paper discusses and presents a hyperelastic incompressible material described by Zahorski potential. The numerical example comparing effective stresses in a cylinder made of Zahorski and Mooney-Rivlin materials was included. The analysis was made in the ADINA software. Conclusions summarize numerical calculations and demonstrate the differences that suggest the use of Zahorski material for rubber and rubber-like materials subjected to large deformations.
Abstract:In this study, the work of the dentist and the identification of musculoskeletal disorders have been characterized. The analysis and compatibility with literature on the identification of musculoskeletal disorders resulting from professional work of dentists have been presented. The authors assessed the occupational risks associated with static load on the position of the dentist by means of the OWAS method.
Abstract:The article presents the results of surface topography measurements of the Nd‒Fe‒B type bonded magnetic material before and after the corrosion test in aggressive environments. The roughness of composite materials is closely related to the technological process. The increase in values of surface roughness parameters weakens the corrosion resistance by development of the actual surface and increases the contact surface with corrosive media. The results are a contribution to further work on the selection of appropriate technological parameters ‒ among others enlargement of the bio-polymer content which contributes to the homogenisation of powder composition and thus has a beneficial effect on the resistance of material to an aggressive environment in a long-term use.
Abstract:This article presents information about the Overall Equipment Effectiveness indicator ‒ a key measure used in the Total Productive Maintenance. The research object has been characterized ‒ test bench, which enables a simultaneous, multiposition calibration, adjustment and verification of single- phase or three- phase electricity meters. In the research part, the analysis of effectiveness of the test bench by means of TPM and Overall Equipment Effectiveness indicators was presented.
Abstract:This study presents the findings concerning the effect of remelting on microstructure and selected properties of sintered duplex steel. It was demonstrated that the methods of processing lead to homogenization and elimination of porosity in the surface layer of sinters, which substantially affects their properties (surface roughness, microhardness and resistance to friction wear). It was found that the degree of tribological wear in the steel used in the study depends primarily on the microstructure and phase composition and less on porosity.
Abstract:The paper presents the results ofstudies onthe topography of surgical borers flank after their operation. The studies were carried out on borers made of X39Cr13 martensitic steel, which was subject to heat and surface (plasma nitriding) treatment. Test drilling was performed in beef bones, which were fixed in a vice to ensure appropriate stability, a borer 6 mm in diameter and 160 mm long was used. The studies on the topography of flank comprised studies on roughness, which were carried out by means of a profilographometer designed for 2D and 3D studies on the surface by means of a contact method. The studies were carried out for borers of flank formed by successive drilling cycles.
Abstract:Changes in technology, availability of video casts and the general increase of information and knowledge value result in the advent of educational technology. As the first step toward validation of the effectiveness of e-learning in engineering education, a research on a group of students was carried out. The open-source and free software educational platform Moodle was used to conduct a selected course in the form of blended e-learning. The course was prepared and presented to the students during one semester time period. The effects of learning were verified through knowledge tests and their results were collected for analysis. Students in the test group achieved results equal or even better than other groups, validating the effectiveness of e-learning in engineering education. During the experiment also other positive aspects of e-learning were noted: students appreciated freedom of time and place where they learn and for the teacher high effort connected with course preparation could be rewarded by multiple use of the developed course at a later time.
Abstract:In the implementation of specialized services a large attention is paid to the flow of information between cells which determine the proper execution of the task. In engineering services related to dentistry there appears to be a significant discrepancy connected with knowledge awareness. The article presents three areas of knowledge (in the range and possession of the required knowledge) and information flow between the patient, dentist and dental technician. A technical solution to increase the possibilities of obtaining information at the design stage of the restoration has also been proposed, by introducing a system of material selection and engineering techniques in dentistry.
Abstract:The article presents current requirements and the results of fire tests for surface protection systems proposed for rolling stock securing. The influence of coating thickness and the type of filler used on the determined parameters is shown.
Abstract:The article presents specific cases appearing in the design of manufacturing databases. In particular, a decomposition of entity model to the physical data model is presented. Understanding of significant differences between them makes it possible to build such structures of industrial databases that include special cases which occur in them. Different strategies for the transition from hierarchical entities model to targeted database tables are described. Additionally, an overview of problems associated with unary entities is outlined in this document.