Technical University in Zvolen OJS
Not a member yet
124 research outputs found
Sort by
THE EFFECT OF THE FOCAL LENGTH POSITION OF THE FOCUSING LENS ON THE DISCOLORATION ROUGHNESS OF PLYWOOD UNDER DIFFERENT CO2 LASER ENGRAVING MODES
Get PDFThe results of a surface roughness study obtained by CO2 laser engraving of birch plywood specimens are presented in the paper. A ZnSe lens with focal length F = 50.8 mm; focal position ∆F = -4, -6, and -8 mm above the material surface; laser beam power P = 4.0, 5.6, and 7.2 W; laser beam scanning speed vf = 250, 260, and 270 mm/s was used for the research. The roughness of the treated surfaces was measured with an electronic profilometer, model Surftest SJ-210 (Mitutoyo – Japan).
The experimental results were evaluated via the parameters Ra, Rq, and Rz and analyzed using specialized software Q-StatLab, ANOVA analysis, and interaction diagrams of all parameters, and relevant conclusions and recommendations were made.
The analyses indicate that the surfaces of birch plywood treated with a CO2 laser exhibit higher roughness than untreated ones, with a deviation of 2 to 4 times greater for the Ra parameter and 2.2 to 3.9 times greater for the Rz parameter. The primary reason for the difference in surface roughness of CO2 laser-treated materials at different focusing positions on the surface is the varying laser beam power density. A higher beam power density leads to more significant absorbed heat, resulting in increased surface roughen
ALTERNATIVE DESIGN CREATION
Get PDFThe paper is focused on using design processes in furniture creation as a mediator to support women's physical and mental health through religious symbols, specifically the Virgin Mary. In the context of the ongoing development of alternative design and its societal impact, this research aims to significantly contribute to understanding social issues through new design approaches. The results will provide designers with visually comprehensible, graphically refined drawing studies, physical models with material tests, and fully functional creations as reference models for practical solutions. Additionally, the article reviews the issues that the authors rely on in their creative and artistic research and presents an artistic-scientific hypothesis. Through specific examples, the authors aim to clarify and interpret the results of their study, grounded in authentic creation
SELECTING COLOR OF MOSAIC PATTERN ELEMENTS FOR LASER ENGRAVING ON WOOD
Get PDFThe research results of color change during laser engraving on the wood of six species: aspen, pine, larch, birch, beech, and spruce, are presented in the paper. The values of color coordinates are measured in the Lab system on test strips with the template grey color gradient changing from white to black. Depending on the template resolution, three distinctive regions are observed. The natural wood color is preserved with the resolution increase in the first region; the wood surface gradually gets darker, reaching the tone limit in the second one, and lighter due to the light reflection in the third. The method for selecting the color of mosaic pattern elements, providing the matching of the color of the original elements and the image engraved on wood, is proposed based on the research results
THE EFFECT OF NATURAL WEATHERING ON STABILITY OF COATING SYSTEM WITH SELF-HEALING MICROCAPSULES
Get PDFThe performance of self-healing and standard coating systems on oak wood exposed to natural weathering for two years is investigated in the paper. The changes in coating thickness, colour coordinates L*, a*, b*, total colour difference ΔE*ab, impact resistance, and adhesion by Pull-off and Cross-cut tests are evaluated in the study. The results show that while both coating system types displayed slight colour alterations, the self-healing coating system containing microcapsules exhibited more colour stability, maintaining a colour difference (ΔE*ab) of 2.6. The primary factors contributing to colour change were variations in lightness (L*) and, to a* lesser degree, the b* coordinate leading to subtle darkening and yellowing of the coatings. However, the self-healing coating system exhibited lower impact resistance indicating increased brittleness and susceptibility to cracking corresponding to the standard coating system. Regarding adhesion, the self-healing coating system showed no changes after weathering, as measured by the Pull-off and Cross-cut tests. In contrast, the standard coating system experienced a 32% reduction in adhesion in the Pull-off test. These findings suggest that although self-healing coatings may offer advantages in colour retention, their application on exterior wood surfaces, particularly those exposed to mechanical stress, requires careful consideration
BOOK REVIEW - DARINA VEVERKOVÁ: ENHANCING FOREIGN LANGUAGE READING COMPETENCE IN HANDLING ESP TEXTS
Get PDFBook revie
EXTERNAL DETERMINANTS OF FAMILY BUSINESS BEFORE AND DURING CORONACRISIS IN SLOVAKIA
Get PDFThe aim of this paper is to identify significant differences in barriers in the segment of family-owned woodworking and furniture enterprises in Slovakia before and during the COVID-19 pandemic, based on an assessment of the current state of family-owned enterprises in Slovakia. Our objective was to gain an up-to-date perspective on family businesses concerning external barriers that directly affect family businesses through a questionnaire survey. The established hypotheses were tested using statistical methods: analysis of variance, Interval estimation of relative abundance, and Duncan's post-hoc test. Based on the findings obtained by the questionnaire, it was found that there are significant differences in importance between the barriers of the external micro and macro environment before and during the COVID-19 pandemic. The results contribute to science and practice and open possibilities for further research in the sector of Slovak woodworking and furniture family businesses
AN ECONOMETRIC MODEL OF TIMBER DEMAND IN THE SLOVAK REPUBLIC
Get PDFGenerally, the timber market is affected by several factors that are reflected in the structure of the supplied and demanded quantities of timber assortments. Econometric modelling is widely used to identify and analyse such factors. This paper deals with the development and evaluation of an econometric model of timber demand on the domestic market of the Slovak Republic in the monitored period of the years 2000 – 2021. The timber demand is determined by two factors: the timber price and GDP. The analysis shows that the raw timber market can be characterized as a regular market with a declining demand curve and a relatively inelastic response concerning price changes. The influence of the GDP factor is more significant, which confirms the theory of the derived demand for wood from the demand for wood products. The results of econometric modelling make it possible to elaborate alternative ex-ante forecasts of timber market development and, as such, they may form the basis for the effective application of different economic and political tools in the forestry and forest-based industry
THE EFFECT OF BEECH WOOD DRYING ON HARDNESS IN THE LONGITUDINAL DIRECTION FROM THE BEGINNING TO THE REAR OF THE SAMPLES
Get PDFThe objective of this study was to determine the hardness of beech wood samples (Fagus sylvatica L.) in the longitudinal direction from the beginning to the rear of the samples versus the method of drying. The warm air-steam mixture drying process and the modified air-drying process were used in the experiment. The warm air-steam mixture drying process, in comparison to the modified air-drying process, caused a reduction of the Janka hardness by about 15.4%. Although the hardness along the length of the sample dried with a mixture of air and steam is leveled, this is not the case for the beginning and the rear of the sample, where drops in hardness are observed
INTEGRATING 4C SKILLS OF 21ST CENTURY INTO ESP COURSES AT UNIVERSITY OF ŽILINA
Get PDFThe demands and requirements of the workforce have experienced significant transformations in the 21st century, thereby requiring higher education institutions to adapt accordingly. The cultivation of a pivotal array of proficiencies commonly referred to as the 4Cs, specifically critical thinking, communication, collaboration, and creativity, has assumed an utmost significance for individuals embarking upon the pursuit of advanced academic endeavors. The critical importance of these skills is incrementally recognized as a way to succeed in the modern dynamic society and is imperative for attaining successful career goals. The significance of cultivating the 4Cs (namely critical thinking, communication, collaboration, and creativity) among students enrolled in higher educational institutions cannot be overstated. This endeavor plays a crucial role in providing them with the essential competencies required to navigate the professional realm, where these proficiencies are highly valued. An emerging pattern within the context of employment is the inclination of employers to take steps to recruit individuals who demonstrate a high level of competence in the domains of critical thinking, communication, collaboration, and creativity. Moreover, it is of utmost importance for individuals to acquire these skills to foster a profound sense of accountability and to cultivate the essential attributes required for assuming positions of leadership and making significant contributions to the community. Therefore, it is of paramount importance for institutions of higher education to prioritize the development of the 4Cs within their curriculum and ensure that students are provided with abundant opportunities to actively apply and improve these skills throughout their academic journey. By employing this particular methodology, students will develop an elevated state of preparedness in order to effectively confront the imminent challenges that lie towards the future. Moreover, they will be equipped with the necessary skills and knowledge to make substantial and meaningful contributions to the broader community. To augment the language proficiency of engineering students at FEIT and SjF UNIZA, we carried out transformations to the seminar's framework to harmonize with pointed out objectives. The subsequent article proffers an evaluation pertaining to the process of transformation
DEVELOPING SOFT SKILLS THROUGH TRANSLATION - THE TABOO SUBJECT OF DEATH IN A TEXT FOR A CHILD READER
Get PDFSoft skills are generally understood as skills that are usually associated with human interaction, communication and social behaviour. These include communication, i.e. the ability to communicate effectively and clearly with other people. It includes the ability to listen, to express ideas and opinions, but also to understand both verbal and non-verbal communication. If translation is understood as communication, the translator should be able to ensure the transfer of the communicated idea from the original to the target culture. In translation, however, we often encounter situations where the communicative intention is clear, but a number of factors can influence its realisation. One of these is the issue of death, which literature and fiction help to process and deal with to some extent. But what about children's literature and the child reader? The aim of this paper is to highlight the aforementioned issue through texts of ancient mythology addressed to a child recipient, and at the same time to highlight translation as a tool that enables the training of soft skills