Iskanje po katalogu digitalne knjižnice

Opis: V diplomski nalogi sem predstavil svoj projekt integracije twin-turbo sistema v turbodizelski motor. Namen naloge je bil vgraditi razmeroma novejši način polnjenja zraka v starejši avtomobil. Gre za predelavo, ki je na trgu predelave dizelskih motorjev še razmeroma redka, pa naj govorimo o cestnih ali dirkalnih projektih. Rezultat predelave je pogonski agregat, ki med vožnjo nudi dovolj moči v čim večjem področju vrtljajev motorja. Med izdelavo naloge sem spoznal, da le predelava sistema za dovajanje zraka v motor ne zadostuje, vendar sem prišel do končnega izdelka uspešno, v obliki avtomobila, ki je primeren za vsakdanjo rabo in hkrati nudi dovolj moči tako za vsakdanje užitke kakor tudi za določene dirkaške namene.
Ključne besede: Twin-turbo, turbodizelski motor, motorna elektronika, regulacija turbin
Objavljeno v DKUM: 09.10.2017; Ogledov: 958; Prenosov: 102
Celotno besedilo (3,03 MB)

Opis: This paper discusses psychomotor development in early childhood and consists of three parts. The first part is a brief historical overview of the theoretical description and analysis of movement. The second part gives an overview of the variety of movement therapies and activity methods, which are effective in kindergarten work. The third part of the paper is an attempt to analyse and to reflect on the authors' own practical experiences of psychomotor work in kindergartens in Poland and Norway.
Ključne besede: early childhood, motor development, movement analysis, psychomotor activity, Poland, Norway
Objavljeno v DKUM: 21.09.2017; Ogledov: 1207; Prenosov: 142
Celotno besedilo (588,56 KB)
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Opis: Motor development consists of dynamic and continuous development in motor behaviour and is reflected in motor competences (on the locomotive, manipulative and postural level) and motor abilities (coordination, strength, speed, balance, flexibility, precision and endurance). This is a complex process in which a child acquires motor abilities and knowledge in interaction with inherited and environmental factors. A sample of 603 boys and girls, of which 263 were aged five (age deviation +/– 3 days; 18,5 ± 3,1kg body weight; 109,4 ± 4,3 cm body height) and 340 were aged six and a half (age deviation +/– 3 days; 23, 7 ± 4, 3 kg body weight; 121 ± 4,8 cm body height), were involved in this study after written consent was obtained from their parents. The children’s motor structure was established through the application of 28 tests that had been verified on the Slovene population and established as adequate for the study of motor abilities in the sample children. The factor analysis was applied to uncover the latent structure of motor space, and PB (Štalec & Momirović) criteria were used to establish the number of significant basic components. The analysis of the motor space structure revealed certain particularities for each age period. In the sample of 5 year old children, the use of PB criterion revealed four latent motor dimensions, in 6.5 year old children, the latent motor space structure was described with four (boys) and five (girls) factors. Despite the existence of gender differences in motor space structure and certain particularities in each age period mostly related to the factors which influence movement coordination, several very similar dimensions were discovered in both sexes.
Ključne besede: early childhood, motor development, motor skills and knowledge, motor structure, factor analysis
Objavljeno v DKUM: 21.07.2017; Ogledov: 20300; Prenosov: 218
Celotno besedilo (249,13 KB)
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Opis: Objective: To investigate associations between running speeds and contraction times in 8- to 13-year-old children. Method: This longitudinal study analyzed tensiomyographic measurements of vastus lateralis and biceps femoris muscles’ contraction times and maximum running speeds in 107 children (53 boys, 54 girls). Data were evaluated using multiple correspondence analysis. Results: A gender difference existed between the vastus lateralis contraction times and running speeds. The running speed was less dependent on vastus lateralis contraction times in boys than in girls. Analysis of biceps femoris contraction times and running speeds revealed that running speeds of boys were much more structurally associated with contraction times than those of girls, for whom the association seemed chaotic. Conclusion: Joint category plots showed that contraction times of biceps femoris were associated much more closely with running speed than those of the vastus lateralis muscle. These results provide insight into a new dimension of children’s development.
Ključne besede: children, tensiomyography, running speed, contraction time, skelet muscle, motor development
Objavljeno v DKUM: 13.07.2017; Ogledov: 1513; Prenosov: 395
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Opis: Namen magistrske naloge je izdelava linearne podajalne osi, ki deluje v realnem času (angl.: real–time) za potrebe izobraževanja na področju krmilne tehnike, avtomatizacije in regulacije. Linearna podajalna os je sestavljena iz linearne podajalne osi, koračnega motorja in servo motorja. Konstrukcija linearne osi omogoča, da je pogonski motor le eden izmed njiju. V magistrski nalogi bodo podrobneje opisani servo motor, krmilje, regulacija in izdelava HMI vizualizacijskega vmesnika v programskem okolju Visual Studio C#. S pomočjo uporabniškega vmesnika, ki smo ga izdelali, lahko izberemo motor, način vodenja in vrsto regulatorja. Uporabniški vmesnik ima možnost izrisa diagrama odzivov. Programska oprema in vse komponente, ki smo jih uporabili za izdelavo linearne podajalne osi, so popolnoma industrijska, to pomeni, da jih srečamo povsod v industriji. Tako uporabnik pridobi znanje, kako pravilno izbrati parametre regulatorja motorja ne glede na to ali je motor manjši ali mnogokrat močnejši.
Ključne besede: linearna podajalna os, servo motor, absolutni dajalnik, Beckhoff, TwinCAT3, Visual Studio C#, zvezni regulatorji, regulacija
Objavljeno v DKUM: 11.07.2017; Ogledov: 1598; Prenosov: 255
Celotno besedilo (3,22 MB)