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61.
STUDY OF ELECTRONIC STATES OF THIN METAL FILMS ON HEAVY METAL SURFACES
Luka Novinec, 2018, magistrsko delo

Opis: V magistrskem delu smo se osredoto£ili na pripravo in karakterizacijo heterogenih ve£plastnih tankih filmov sestavljenih iz kovin ter teºkih kovin. Za izdelavo vzorcev smo izbrali dve feromagnetni kovini, Fe in Gd, ter eno divalentno kovino iz redkih zemelj, Yb. Tanke filme smo nana²ali na kristalno povr²ino volframa W(110) ter molibdena Mo(110). V primeru Fe na povr²ini W(110) in Mo(110) ter Yb na pov²ini Mo(110) smo uspe²no dolo£ili pogoje, potrebne za nana²anje atomsko enakomernih filmov. S pomo £jo kotno odvisne fotoemisije smo preu£evali kvantna stanja v Fe in Yb filmih na Mo in W kristalih. Celotno eksperimentalno delo je potekalo na ºarkovnih linijah VUV-Photoemission in²tituta (ISM-CNR) ter BaDElPh pri sinhrotronu Elettra v Trstu.
Ključne besede: electronic states, thin metal films, heavy metal surfaces
Objavljeno: 04.12.2019; Ogledov: 168; Prenosov: 3
.pdf Polno besedilo (25,10 MB)

62.
Ocena ekonomske upravičenosti izgradnje poslovnega objekta ter načrtovanje novega postopka proizvodnje v izbranem podjetju
Sebastian Fornazarič, 2019, diplomsko delo

Opis: Podjetje LEDLUKS d.o.o. že več kot 6 let izdeluje luči na LED osnovi. Doseglo je stanje, kjer želi skrajšati čas, ki poteče od prejetja naročila do njegovega končanja. Glede na proizvodne potrebe smo tudi prišli do zaključka, da proizvodnja brez zalog (v nadaljevanju bo uporabljen izraz JIT) ni primerna in, da se je potrebno poslužiti agilne proizvodnje. Z analizo proizvodnega procesa smo ugotovili, da ima vsak aluminijasti profil luči zelo dolgo pot, pri čemer je vsak korak potencialen razlog za zamude. Izkazalo se je, da so podizvajalci nezanesljivi, kar dodatno dokazuje neprimernost proizvodnje tipa JIT. Zato smo zastavili koncept novega proizvodnega procesa, ki skoraj ne potrebuje podizvajalcev. Izračunali smo potrebne količine, ki bi jih moralo podjetje imeti na zalogi. Te presegajo možnosti obstoječih prostorov, kjer ni možnosti širitve. Ena izmed opcij je izgradnja namenskega objekta. Najprej smo analizirali trenutno prostorsko stanje in ocenili potrebne zahteve podjetja. Na podlagi bilanc smo določili tudi promet do leta 2030 in odnos do stroškov. Po informativni ponudbi gradbinca in raziskavi nepremičninskega trga smo določili okvirno ceno celotnega projekta. S kalkulacijami in uporabo poslovnih izkazov smo ugotavljali smiselnost projekta in ali se le ta povrne v želenem obdobju. Predštudija naj bi služila kot osnova za na daljno poglobitev, saj so rezultati obetajoči.
Ključne besede: ekonomska upravičenost, proizvodnja, proizvodni proces, LED, pred študija, zaloga, agilna proizvodnja
Objavljeno: 04.12.2019; Ogledov: 133; Prenosov: 6
.pdf Polno besedilo (1,73 MB)

63.
Prešernovo vnebovzetje - iz pekla do neba
Zoran Božič, druga izvedena dela

Opis: Predavanje odkriva vzroke za Prešernov življenjski "pekel" in opisuje njegovo pot na vrh slovenskega Parnasa; zakaj ni imel možnosti postati svetnik in kako je postal kulturni svetnik. Ob tem pa prinaša še kopico manj znanih stvari iz življenja in dela.
Ključne besede: Prešeren, romantika, kanonizacija, srednješolska berila, klasična poezija, ustvarjalnost v poznih letih, recepcija literature
Objavljeno: 04.12.2019; Ogledov: 148; Prenosov: 0
.pdf Polno besedilo (4,79 MB)

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66.
Zr/Cu-TiO2 CATALYSTS FOR PHOTOCATALYTIC WATER TREATMENT
Olena Pliekhova, doktorska disertacija

Opis: This work entitled «Zr/Cu-TiO2 catalysts for photocatalytic water treatment» tackles a problem of tons of dyes discharged everyday mainly from textile industries. This is a huge concern because of dyes persistence, toxicity and potential to the bioaccumulation in living organisms. Here, a small contribution to overall problem is presented. The research work consists of three main parts: Theoretical background, Experimental and Results and discussion. In the Theoretical background chapter the overall problem is identified and discussed. The main water treatment techniques are presented briefly with their advantages and drawbacks. Photocatalysis assisted with TiO2 is shown as an alternative additional technique with its own pros and cons. Further, a cursory overview of TiO2 modification techniques is made and advantages in using copper and zirconium oxides for TiO2 modification are presented. The reason and possible positive effect of using of two oxides simultaneously for TiO2 modification is indicated. Additionally, a positive impact of solar light for overall rate of dyes degradation assisted with TiO2 is discussed. Within the framework of photosensitization effect, the problem of using dyes for assessment of photocatalytic properties of materials under the visible light is touched on. Photothermal methods as possible beneficial techniques for this purpose are proposed. In the Experimental chapter, all experimental techniques used in current research work with the technical details specific for the research work are presented. There are methods of materials preparation, photocatalytic tests under different conditions and varying model pollutants, and physico-chemical characterization techniques. The Results and discussion chapter is divided by three subchapters. Each chapter is dedicated to one hypothesis, which was checked and confirmed or disproved. The first hypothesis is about beneficial loading of copper and zirconium oxides to TiO2. After numerous experiments held, it was concluded that the pair of copper and zirconium oxides is beneficial for simultaneous application on TiO2 surface to promote its performance. The second subchapter is about zirconium distribution and its impact on the activity of studied materials towards the antraquinone dye Reactive Blue 19. Different techniques such as XRD, TEM, EXAFS and many others were used in order to characterize the materials and to understand the details of the processes taking place. The existence of upper limit of copper oxide loading for its beneficial effect on TiO2 performance was demonstrated. It was observed that zirconium species loading leads to improvement in performance of materials with higher copper loading, which otherwise lowers activity of TiO2 – this is in case when copper only above its optimal level is present. It was concluded that zirconium oxide containing species occupy rutile surface sites in mixed phase TiO2 and this way beneficially influence the material performance towards the dye removal. The third subchapter is about the visible light TiO2 assisted dye degradation. It is well known that photosensitization mechanism of dye degradation appears under the visible and as a consequence under the solar light irradiation. This leads to the overall enhancement of dyes degradation, which is positive and may be used as a benefit for faster pollutant destruction. However, this fact leads to mishmash in the determination of real photocatalytic activity of materials towards the dye. It was hypothesized that the impact of photosensitization mechanism on the overall material performance against Reactive blue 19 dye (RB19) descends with the dye concentration lowering. Thermal lens spectrometry (TLS) which is sensitive to chemicals at low concentrations was used for hypothesis evaluation. To summarize the research work achievements, the conclusions of the thesis are given at the end.
Ključne besede: titanium dioxide, photocatalysis, zirconium/copper, surface modification, water treatment, dyes
Objavljeno: 03.12.2019; Ogledov: 165; Prenosov: 5
.pdf Polno besedilo (3,18 MB)

67.
WEAK CLOSURE OPERATIONS WITH SPECIAL TYPES IN LOWER BCK-SEMILATTICES
Hashem Bordbar, Young Bae Jun, 2017, izvirni znanstveni članek

Opis: The notions of (strong) quasi prime mapping on the set of all ideals, t- type weak closure operation, and tender (resp., naive, sheer, feeble tender) weak closure operation are introduced, and their relations and properties are investigated. Conditions for a weak closure operation to be of t-type are provided. Given a weak closure operation, conditions for the new weak closure operation to be of t-type and to be a naive (sheer, feeble tender) weak closure operation are considered. We show that the new weak closure operation is the smallest tender weak closure operation containing the given weak closure operation.
Ključne besede: (strong) quasi prime mapping, t-type weak closure operation, naive (sheer, tender, feeble tender) weak closure operation.
Objavljeno: 02.12.2019; Ogledov: 117; Prenosov: 0
.pdf Polno besedilo (85,80 KB)

68.
Semi-prime and meet weak closure operations in lower BCK-semilattices
Hashem Bordbar, Mohammad Mehdi Zahedi, 2017, izvirni znanstveni članek

Opis: The notion of semi-prime (resp., meet) weak closure operation is introduced and related properties are investigated. Characterizations of a semi-prime (resp. meet) closure operation are discussed. Examples show that the notion of semi-prime weak closure operation is independent of the notion of meeting weak closure operation.
Ključne besede: non-zeromeet element, meet ideal, relative annihilator, semi-prime (resp., meet) weak closure operation.
Objavljeno: 02.12.2019; Ogledov: 124; Prenosov: 0
.pdf Polno besedilo (267,87 KB)

69.
UNI-SOFT COMMUTATIVE IDEALS WITH THRESHOLDS IN BCK/BCI-ALGEBRAS
Hashem Bordbar, Seok Zun Song, Young Bae Jun, Kyoung Ja Lee, 2018, izvirni znanstveni članek

Opis: The notion of a uni-soft commutative ideal with thresholds is introduced, and related properties are investigated. Relations between a uni-soft ideal with thresholds and a uni-soft commutative ideal with thresholds are discussed. Conditions for a uni- soft ideal with thresholds to be a uni-soft commutative ideal with the same thresholds are provided. Characterizations of a uni-soft commutative ideal with thresholds are established.
Ključne besede: uni-soft ideal (with thresholds), uni-soft commutative ideal (with thresholds).
Objavljeno: 02.12.2019; Ogledov: 114; Prenosov: 0
.pdf Polno besedilo (141,42 KB)

70.
IDEALS OF IS-ALGEBRAS BASED ON N-STRUCTURES
Hashem Bordbar, Mohammad Mehdi Zahedi, Young Bae Jun, 2018, izvirni znanstveni članek

Opis: The notion of a left (resp., right) NI-ideal is introduced, and related properties are investigated. Characterizations of a left (resp., right) NI-ideal are considered. Translations of a left (resp., right) NI-ideal are studied. We show that the homomorphic image (preimage) of a left (resp., right) NI-ideal is a left (resp., right) NI-ideal. The notion of retrenched left (resp., right) NI-ideals is introduced, and their properties are investigated.
Ključne besede: Left (resp., right) NI-ideal, translation, closed support, retrenched left (resp., right) NI-ideal.
Objavljeno: 02.12.2019; Ogledov: 104; Prenosov: 0
.pdf Polno besedilo (118,91 KB)

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