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2.
UČINKI MAGNETNE OBDELAVE PRALNIH VOD
Gregor Temnikar, 2010, undergraduate thesis

Abstract: Diplomska naloga obravnava učinke magnetne obdelave pralnih vod pri postopkih nege tekstilij. Obravnava problematiko trdote vode v postopkih nege tekstilij in posledično vpliv in učinkovitost magnetne obdelave pralne vode na primarne in sekundarne parametre kakovosti nege tekstilij. V diplomski nalogi so predstavljene lastnosti uporabljenih materialov ter uporabljeni postopki, metode in naprave. Glavni cilj naloge je bil usmerjen v raziskavo in ovrednotenje učinkov magnetne obdelave pralnih vod v odvisnosti od izbranega postopka nege tekstilije, kakor tudi v vrednotenju odstranjevanja madežev oziroma nečistoč s tkanine.
Keywords: Trdota vode, nega tekstilij, magnetna obdelava vode, primarni in sekundarni učinki nege tekstilij, odstranjevanje madežev.
Published: 11.10.2010; Views: 1651; Downloads: 114
URL Link to full text

3.
AEROBNA RAZGRADNJA DUŠIKOVIH KOMPONENT V ODPADNIH VODAH -ŠTUDIJA VPLIVA MAGNETNEGA POLJA
Martina Majerič, 2011, undergraduate thesis

Abstract: Biološko čiščenje odpadnih voda je namenjeno zmanjševanju onesnaženosti okolja. V ta namen uporabljamo razne vrste čistilnih naprav z različnimi načini obratovanja. Namen naše raziskave je bil ugotoviti vpliv magnetnega polja na učinek čiščenja sintetične odpadne vode v aerobnem pretočnem in šaržnem reaktorju. Pri tem smo skušali doseči ponovljivost priprave sintetične odpadne vode, predvsem glede na koncentracijo skupnega dušika. To nam je omogočalo primerjavo končnih rezultatov različnih načinov obratovanja. Koncentracija skupnega dušika na iztoku je bila po obdelavi z magnetnim poljem v obeh reaktorjih nižja, kot v primeru obratovanja brez magnetnega polja. Pri obeh vrstah obratovanja smo dosegli zelo visoko učinkovitost (do 98 %), ki je bila pri magnetnem polju nekoliko višja in dosežena v krajšem času.
Keywords: Sintetična odpadna voda, aktivno blato, magnetno polje, aerobni pretočni reaktor, aerobni šaržni reaktor
Published: 14.09.2011; Views: 1755; Downloads: 203
.pdf Full text (3,80 MB)

4.
Prenos toplote : zapiski predavanj
Darko Goričanec, Lucija Črepinšek-Lipuš, 2008, other educational material

Keywords: termodinamika, prenos toplote, sevanje toplote, prenosniki toplote
Published: 31.05.2012; Views: 1982; Downloads: 153
URL Link to full text

5.
Magnetic water treatment for scale control in heating and alkaline conditions
Viljem Kozic, Anton Hamler, Irena Ban, Lucija Črepinšek-Lipuš, 2010, original scientific article

Abstract: Magnetic water treatment (MWT), an alternative solution for scale control, is discussed with emphasis on the construction of the magnetic devices and the mechanism of MWT influence on the scale formation. Two applications in high-temperature and high-pH conditions are presented. The treatment noticeably reduced the scale thickness on the heating spiral and removed preciously precipitated scale from hot tap-water outlet pipe; on the walls in the zone with heated alkaline water, instead of hard scale, only thin, brittle coating was formed. The morphology analyses showed the acceleration of aragonite nucleation and raised formation of fine suspended particles.
Keywords: scale control, magnetic sater treatment, crystallization
Published: 31.05.2012; Views: 6320; Downloads: 99
URL Link to full text

6.
Influence of magnetic field on the aragonite precipitation
Lucija Črepinšek-Lipuš, Danijela Urbancl, 2007, original scientific article

Abstract: Many laboratory investigations of magnetic water treatment (MWT) for scale control explained the formation of less compact scales by raised portion of aragonite, which is needle-like and less adhesive than rhombohedral calcite crystals, while our experiment was conducted with tap water, which contains Mg+2 and Fe+2 ions in concentrations exceeding thresholds for calcite inhibition, common for major tap waters. MWT efficiency was evaluated by amounts of scale precipitated in boilers and pipes during three-weeks run of two parallel experimental lines-one with and another without magnetic treatment. All scales were identified by X-ray diffractometer to be aragonite,but in the case of magnetic treatment, scales occurred in much smaller amounts: the scale on heating copper-pipe spiral was 2.5-times thinnerdue to MWT and in zinc-coated steel pipe occurred as very thin powder-like coating, while in the line without the treatment abundant hard lining was formed. The scalesć morphology was observed by scanning electron microscope: the husks from both lines consisted of parallel distributed needles, but these crystals were about four times thinner in the case of MWT. The present work demonstrates that hard scale deposits can form even under conditions where aragonite precipitates predominantly, and that MWT can also affect the crystallization of this polymorph in a manner conducive to scaling control.
Keywords: water, magnetic water treatment, scale, aragonite, cristallization, water supply pipes
Published: 01.06.2012; Views: 1249; Downloads: 67
URL Link to full text

7.
Spremenjeno kristaljenje vodnega kamna pri magnetni obdelavi vode
Andrej Pristovnik, Lucija Črepinšek-Lipuš, Jurij Krope, 2000, review article

Abstract: Magnetna obdelava vode (MOV) je alternativna metoda priprave napajalnih vod za nadzor vodnega kamna in prav tako postaja pomembna pri izboljšavah drugih tekočin, ki vsebujejo vodo. Govor je o učinkih naprav MOV, med njimi o spremenjenem kristaljenju vodnega kamna in spremenjeni stabilnosti vodnih disperzij s poudarkom na spremenjeni hidrataciji ionov in trdnih površin zaradi magnetne protonske resonance kot enega izmed možnih mehanizmov. Nadalje je predlagana pojasnitev pospešenega obarjanja aragonita.
Published: 10.07.2015; Views: 556; Downloads: 19
URL Link to full text

8.
Preprečevanje izločanja vodnega kamna na površinah za magnetno obdelavo vode
Andrej Pristovnik, Lucija Črepinšek-Lipuš, Jurij Krope, 2000, review article

Abstract: V nalogi predstavljamo metodo za nadzor vodnega kamna na temelju magnetne obdelave vode(MOV) v prenosnikih toplote. Podali smo teoretičen pregled tvorbe kotlovca pri industrijskih prenosnikih toplote s poudarkom na obarjanju kalcijevega karbonata(CaCO3) in kalcijevega sulfata(CaSO4) ter osnovne izračune za uspešno uporabo naprav MOV pri preprečevanju nastajanja vodnega kamna.
Published: 10.07.2015; Views: 551; Downloads: 25
URL Link to full text

9.
Magnetic field effects on redox potential of reduction and oxidation agents
Mojca Božič, Lucija Črepinšek-Lipuš, Vanja Kokol, 2008, original scientific article

Abstract: Redox potentials of two reducing (sodium dithionite and glucose) and two oxidizing (hydrogen peroxide and sodium hypochlorite) agents were monitored at various concentrations and at different temperatures for 30-75 minutes after the exposure of their water solutions (glucose and hypochlorite solutions once; sodium dithionite and hydrogen peroxide solutions one, two and/or three-times) to the static magnetic field of flux density of 0.9 V s M-2 . The aim of the investigation was to suggest improvements, i.e., intensification and stability, of the reduction-oxidation ability of selected agents applicable in textile fibre processing, primarily bleaching and vat dyeing. Results of the experiments show that magnetic treatment (of solutions) raises both the reducing ability of glucose and the oxidation ability of hydrogen peroxide and sodium hypochlorite, promising some technological and economical benefits for the textile industry as well as forother fields of chemistry.
Keywords: magnetic water treatment, sodium dithionite, glucose, hydrogen peroxide, sodium hypochlorite, redox potential, textile vat processing
Published: 05.07.2017; Views: 318; Downloads: 48
.pdf Full text (206,88 KB)
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10.
Primerjalno umerjanje laserskih interferometrov
Aleksander Trep, 2019, master's thesis

Abstract: V magistrskem delu je predstavljeno primerjalno umerjanje laserskih interferometrov. Izdelan je bil koncept postopka in ovrednotena merilna negotovost na osnovi eksperimenta. Eksperimentalno delo je bilo izvedeno v Laboratoriju za tehnološke meritve (LTM) na Fakulteti za strojništvo v Mariboru z namenom kasnejše izdelave dokumentacije za umerjanje laserskih interferometrov. Eksperimenti so bili izvedeni s pomočjo referenčnega laserskega interferometra, ki ga imamo v laboratoriju, ter z dvema industrijskima testnima laserskima interferometroma. Ugotovljeno je bilo, da v laboratoriju dosegamo ustrezne pogoje za izvedbo meritev, potrebno pa je biti pazljiv pri sami postavitvi laserjev, saj orientacija laserjev povzroča ključne pogreške pri umerjanju. Prav tako je potrebno izbrati pravilno metodo primerjave, saj lahko tudi ta bistveno vpliva na rezultat umerjanja.
Keywords: laserska interferometrija, primerjalno umerjanje, merilni pogrešek, merilna negotovost
Published: 13.03.2019; Views: 273; Downloads: 36
.pdf Full text (2,91 MB)

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