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1.
Analysis of noise sources produced by faulty small gear units
Aleš Belšak, Jurij Prezelj, 2007, original scientific article

Abstract: Noise source vizualization represents an important tool in the field of technical acoustics. There are many different techniques of noise source visualization. Most of them, however, are intended for a specific noise source in a specific type of acoustic environment. Consequently, a certain visualization method can be used only for certain types of noise sources in a specific acoustic environment and in a restricted frequency area. This paper presents a new visualization method of complex noise sources on the basis of the use of an acoustic camera. A new algorithm has been used, which makes it possible to visualize all types of different complex noise sources. Monopole, dipole or quadropole noise sources can be observed simultaneously. It is possible to track a moving noise source by means of an acoustic camera. In addition to that it is possible to observe various transient acoustical phenomena. Through the use in diagnostics, it is possible to define, by means of noise, the condition of mechanical systems at an advance level.
Keywords: gears, failure, noise sources, visualization of noise sources, sound, acoustic analysis, acoustic camera, signal analysis, acoustic image, measurements
Published: 31.05.2012; Views: 1031; Downloads: 24
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Impact of nanoparticles on nematic ordering in square wells
Mitja Slavinec, Eva Klemenčič, Milan Ambrožič, Marjan Krašna, 2015, original scientific article

Abstract: Nematic liquid crystalline structures within square wells are studied numerically using both Lebwohl-Lasher lattice semimicroscopic and the Landau-de Gennes mesoscopic approach. At lateral boundary wall strong planar anchoring is enforced. The cell thickness h along the z Cartesian coordinate is assumed to be smaller than the characteristic square well size R. Using semimicroscopic modelling we restrict to effectively two-dimensional systems which we study in terms of the tensor nematic order parameter. We consider impact of appropriate nanoparticles (NPs) on nematic configuration for cases where R becomes comparable to the biaxial order parameter correlation length. In this case a star-like order reconstruction biaxial profile could be formed in absence of NPs. We demonstrate existence of a rich variety of different nematic structures, including topological defects, which are enabled by presence of appropriate NPs.
Keywords: liquid crystals, nanoparticles, nematic ordering, square well, software simulation, visualization
Published: 14.06.2017; Views: 387; Downloads: 186
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4.
Developing spatial ability using 3D modeling in lower secondary school
Andrej Šafhalter, Srečko Glodež, Boris Aberšek, Karin Bakračevič Vukman, 2014, original scientific article

Abstract: In recent years 3D modeling has been increasingly utilized during product design in lower secondary schools as well. Its greatest advantage over classical technical drawing and 2D drawing software lies in the fact students are able to observe the object they are designing from all the viewpoints of a virtual three-dimensional space. Since thinking and visualization in the process of object design also appear in three dimensions, the mental manipulation and guesswork required from students in order to add another dimension to an object pictured on a level plane are no longer necessary. Additionally, 3D modeling has a range of contributions to the cognitive development of children, which was also the subject of this research. The central question raised was whether students are able to improve their spatial ability by using modeling tools. The research included 196 students aged between 11-15 years, of which 95 were placed in the experimental group and 101 in the control group. Spatial ability was measured using pre-test and post-test.
Keywords: 3D modeling, cognitive development, spatial abilities, visualization
Published: 15.12.2017; Views: 304; Downloads: 60
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5.
Developing spatial visualization with 3D modeling
Andrej Šafhalter, Srečko Glodež, Karin Bakračevič Vukman, 2012, original scientific article

Abstract: The research was carried out in 20 11 among 22 pupils from 14-15 years old. The purpose of the pilot study was to determine the influence of 3D modeling on the spatial visualization of pupils, as well as the gender difference in the spatial visualization of the tested pupils and the progress of this visualization in individual genders. ln addition, it tried to determine whether the sensory style of the pupils, visual. auditory or kinesthetic, influences spatial perception and the development of spatial visualization. Pupils were divided into two groups, the test group and the control group. Pupils in the test group attended a 3D modeling extra-curricular activity for twelve teaching hours in the second evaluation period of the 2010/2011 school year. Spatial visualization was determined with a modified spatial visualization test. namely before the extra-curricular activity and afterwards. The modified test consisted of different spatial visualization tests: PSVT: R, MeT, MRT, DAT: SR. and tests of rotation within a plane. For 3D modeling exercises pupils used the open-source software Google SketchUp. None of the tested pupils have encountered the mentioned software before. After a second testing, the test group showed greater progress in solving spatial visualization tasks in comparison with the control group, while gender differences were minimal. The results of the spatial visualization test were also compared with the sensory style of pupils, which was filled out by all the pupils included in the study. ln the 2011/2012 school year a broader study is underway, involvlng almost two hundred pupils of various elementary schools in Slovenia.
Keywords: spatial visualization, 3D modeling, perception styles
Published: 15.12.2017; Views: 313; Downloads: 46
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6.
Visualization of alpha-beta game tree search
Emilija Taseva, 2019, undergraduate thesis

Abstract: Algorithms make up a crucial part of computer science studies. Learning and understanding new algorithms can be quite interesting, but also hard and complex, especially for students. Visualization can significantly help with the understanding of the dynamic behaviour of algorithms by visually displaying each step of the algorithm, its purpose and how it changes the data. Besides faster and more efficient learning, the better understanding can also lead to potential algorithm improvements in the future. The goal of this thesis is visualization of the alpha-beta tree search algorithm for determining the next optimal move in a two-player, zero-sum, complete information game. The algorithm is visualized using two games, Tic-Tac-Toe and Othello. The algorithm operation can also be demonstrated using a custom tree with parameters chosen by the user.
Keywords: algorithm visualization, minimax algorithm, alpha-beta pruning, adversarial search
Published: 08.11.2019; Views: 120; Downloads: 25
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