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Oskrbne verige tekstilnih in oblačilnih izdelkov
Narina Kosec, 2019, undergraduate thesis

Abstract: Oskrbne verige so za podjetja najpomembnejši del poslovanja. Podjetje lahko uspešno posluje, če ima strogo načrtovane oskrbne verige in zadovoljuje zahteve odjemalcev. Delovanje podjetja na konkurenčnih trgih zahteva vedno boljšo organizacijo poslovnih procesov. Organizacija in načrtovanje poteka od samega začetka procesov. Poteka od razvoja, nabave, proizvodnje, prodaje, do logističnih in distribucijskih procesov. Upravljanje oskrbne verige postaja čedalje bolj pomembno pri managerskih disciplinah, saj managerji skrbijo za učinkovitost in kakovost odnosov med udeleženci v oskrbni verigi. V podjetju Hokston d. o. o se zavzemajo za dobro organizirano oskrbno verigo, saj jim to prinaša konkurenčno prednost na trgu. Namen diplomskega projekta je ugotoviti kakšna je oskrbna veriga v podjetju. Podjetje se mora stalno prilagajati konkurenci, ne sme pa pozabiti na končne odjemalce, katerih želje so vedno bolj zahtevne.
Keywords: oskrbna veriga, fleksibilnost, tekstilna industrija, nabava, skladiščenje, prodaja
Published: 17.11.2020; Views: 105; Downloads: 19
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3.
Spremembe samovarovalnih ukrepov pri prebivalcih Slovenije
Branko Lobnikar, Kaja Kosec, 2014, original scientific article

Abstract: Namen prispevka: Zagotavljanje varnosti in zagotavljanje občutkov varnosti vedno bolj postaja tudi naloga vsakega posameznika, ki vstopa v partnerski odnos s pluralnimi institucijami formalnega družbenega nadzorstva. Namen prispevka je bilo ugotoviti, ali so se pri prebivalcih Slovenije v zadnjem desetletju spremenili vedenjski vzorci na področju samovarovalnih ukrepov, pri čemer smo poskušali ugotoviti, ali na spremembe, če do njih sploh prihaja, vpliva posameznikova percepcija varnosti. Metode: Za potrebe analize je bil pripravljen anketni vprašalnik, s katerim smo želeli ugotoviti, katere samovarovalne ukrepe in mehanizme posamezniki uporabljajo v svojem bivalnem okolju, zanimalo pa nas je tudi, katere od teh ukrepov so uporabljali pred desetletjem. V raziskavi, ki je bila izvedena v prvi polovici leta 2012, je sodelovalo 356 prebivalk in prebivalcev iz Slovenije, zbiranje podatkov pa je bilo izvedeno s pomočjo spletnega anketiranja (spletni portal SurveyGizmo). Kot metoda za zbiranje je bila uporabljena tehnika snežne kepe. Ugotovitve: Raziskava je pokazala, da se ljudje v svojem domačem kraju počutijo relativno varne. Iz rezultatov raziskave je razvidno, da prebivalci danes uporabljajo večje število varnostnih ukrepov kot pred desetimi leti. Največja odstopanja pri uporabi posameznih ukrepov so vidna pri ukrepih »dosledno zaklepanje vrat«, »dogovor s sosedi ali znanci, da spremlja vaše stanovanje v času odsotnosti«, »polno kasko zavarovanje avtomobila« in »dogovor s sosedi ali znanci, da praznijo poštni nabiralnik v času odsotnosti«. Najmanjšo uporabo samovarovalnih ukrepov je mogoče zaslediti pri ukrepu »uporaba video nadzora«, saj je velika večina ne uporablja oziroma si jo lahko privoščijo le redki. Ugotovili smo, da se ženske na splošno počutijo bolj ogrožene kot moški. Posledično tako pogosteje uporabljajo samovarovalne ukrepe. Omejitve/uporabnost raziskave Pomanjkljivost raziskave je relativno majhen vzorec, kjer je razmerje med moškimi in ženskami nekoliko porušeno, omejitve pa izhajajo tudi iz metode zbiranja podatkov in starostne strukture vzorca. Kljub temu pa so rezultati raziskave uporabni kot izhodišče za nadaljnje raziskovanje. Praktična uporabnost: Rezultati raziskave nudijo odgovore na nekatera do zdaj redko analizirana, a pogosto postavljena vprašanja, ki zadevajo temo zagotavljanja varnosti s pomočjo samovarovalnih mehanizmov in ukrepov. Izvirnost/pomembnost prispevka: Gre za prvo tovrstno raziskavo v slovenskem prostoru, zato rezultati raziskave predstavljajo dodatek k obstoječim dejstvom in številnim kriminološkim viktimološkim raziskavam in raziskavam o strahu pred kriminaliteto.
Keywords: strah pred kriminaliteto, varnost, preventivni ukrepi, samovarovalni mehanizmi
Published: 21.04.2020; Views: 173; Downloads: 19
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4.
The characterization of phase transformations in rapidly solidified Al-Fe and Cu-Fe alloys through measurements of the electrical resistance and DSC
Milan Bizjak, Ladislav Kosec, Borut Kosec, Ivan Anžel, 2006, original scientific article

Abstract: For the characterization of the phase transformations in the alloys during the heat treatment the various methods of the thermal analyses are available. Thermogravimetry, differential thermal analysis (DTA) and the differential scanning calorimetry (DSC) are the most frequently used methods. The phase transformations proceed in two stages, i.e. nucleation and the growth of the new phase. Both processes are closely linked with the movement of the atoms. Rapidly solidified alloys often contain the elements with the low diffusivity. During the transition from the unstable to the stable state the energy changes are small, therefore the characterization of the changes by DTA, DSC is very difficult and could not be measured. During the heat treatment the phase transformations of the rapidly solidified alloys of Al-Fe and Cu-Fe were successfully detected by the simultaneous measurements of the electrical resistance, and were compared by the DSC method. By determination of the temperature regions of the phase transitions or temperatures, where the dynamics of the changes is maximal, the samples were heat treated and analysed by the scanning and transmission electron microscopy respectively.
Keywords: rapidly solidified Al-Fe alloy, rapidly solidified Cu-Fe alloy, transformations, electrical resistance, differential scanning calorimetry
Published: 03.07.2017; Views: 1320; Downloads: 73
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5.
Synthesis and characterization of hardened Cu-Fe-Ni-P alloy
Goran Brovč, Goran Dražić, Blaž Karpe, Igor Đorđević, Gorazd Lojen, Borut Kosec, Milan Bizjak, 2015, original scientific article

Abstract: In the manufacturing industry of electrical contacts, the prohibition of the use of toxic metals (Cd, Be), and desire to avoid the alloying with precious metals (Ag) has created a need for new alloys with good electrical conductivity and high mechanical properties at elevated temperatures. As a potentially useful material for this purpose, we have analyzed the continuously cast Cu-Fe-Ni-P alloy in various heat treatment conditions. Sequence of phase transformations during heat treatment was followed by 4 point D.C. electrical resistivity measuring method, and analyzed by scanning (SEM) and transmission (TEM) electron microscopy. Measurements of Vickers hardness and electrical conductivity after various heat treatment procedures indicate on high potential of Cu-Fe-Ni-P alloys as a material for electrical contacts.
Keywords: copper alloys, precipitation hardening, electrical contacts, electrical conductivity
Published: 03.07.2017; Views: 1549; Downloads: 73
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6.
Rhodium platings
Rebeka Rudolf, Bojan Budić, Dragoslav Stamenković, Miodrag Čolić, Andrej Ivanič, Borut Kosec, 2013, short scientific article

Abstract: Modern rhodium plating solutions are based on either sulphate or phosphate. Although in theory there are four possible combinations, in practice only three different rhodium electrolytes are used. These are based on dilutions of rhodium sulphate or phosphate concentrates with added sulphuric or phosphoric acid. These processes are be discussed in this paper with a demonstration of Rh platings in the Slovenian firm Zlatarna Celje d.d.
Keywords: rhodium, plating, jewellery, properties
Published: 03.07.2017; Views: 568; Downloads: 67
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7.
Microstructure of NiTi orthodontic wires observations using transmission electron microscopy
Janko Ferčec, Darja Jenko, Borut Buchmeister, Franc Rojko, Bojan Budič, Borut Kosec, Rebeka Rudolf, 2014, original scientific article

Abstract: This work presents the results of the microstructure observation of six different types of NiTi orthodontic wires by using Transmission Electron Microscopy (TEM). Within these analyses the chemical compositions of each wire were observed in different places by applying the EDS detector. Namely, the chemical composition in the orthodontic wires is very important because it shows the dependence between the phase temperatures and mechanical properties. Micro- structure observations showed that orthodontic wires consist of nano-sized grains containing precipitates of Ti2Ni and/or TiC. The first precipitated Ti2Ni are rich in Ti, while the precipitated TiC is rich in C. Further investigation showed that there was a difference in average grain size in the NiTi matrix. The sizes of grains in orthodontic wires are in the range from approximately 50 to 160 nm and the sizes of precipitate are in the range from 0,3 μm to 5 μm.
Keywords: orthodontic wires, nickel-titanium orthodontic wire, NiTi wire, shape memory alloys, SMA wires, microstructure, transmission electron microscopy, TEM, average grain size
Published: 03.07.2017; Views: 624; Downloads: 78
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8.
Microstructure analysis of internally oxidized Cu-C composite
Rebeka Rudolf, Ladislav Kosec, Alojz Križman, Ivan Anžel, 2006, original scientific article

Abstract: On the basis of experimentally obtained data, it was established that submicron-size bubbles are formed by the internal oxidation of Cu-C composite with fine dispersed graphite particles. They are homogeneously distributed in the Cu-matrix. This process starts with the dissolution of oxygen into the metal at the free surfaces, and continues with the diffusion of oxygen atoms into the volume of copper crystal lattice where they react with the graphite particles. The reactions of dissolved oxygen with carbon yield the gas products (CO2, CO), which cannot be dissolved in the crystal lattice of the matrix. The gas molecules, which are enclosed in the space previously occupied by the graphite, have a greater specific volume than the solid graphite. Consequently, compressive stresses arise in the copper matrix around the bubbles. The interaction of these stress fields with gliding dislocations during loading could improve the mechanical properties of the copper. The internal oxidation kinetic in Cu-C composite depends on the diffusion of oxygen in the copper matrix, and the penetration depth of the internal oxidation front indicates the parabolic nature of the process.
Keywords: metallurgy, Cu-C composites, internal oxidation, bubbles
Published: 03.07.2017; Views: 428; Downloads: 66
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9.
Mechanical properties and microstructure characterisation of Au-Pt dental alloy
Rebeka Rudolf, Tjaša Zupančič Hartner, Ladislav Kosec, Aleksandar Todorović, Borut Kosec, Ivan Anžel, 2008, original scientific article

Abstract: Development of a dental alloy with high Au content is based on the ternary system of Au-Pt-Zn with a nominal composition of 86,9Au-9,9Pt-1,5Zn, and about 1,5 wt.% micro-alloying elements (In, Ir, Rh). The results analyses of different heat-treated states showed that the optimal mechanical properties and hardness of an Au-Pt-Zn alloy can be reached with combinations of heat treatment for 20 minutes at 723 K and then slowly cooling, if the alloy was annealed at 1223 K for 30 minutes and the water quenched. Research results confirmed that the microstructure of the Au-Pt-Zn alloy consists of two phases: α1-phase rich in Au (main phase) and α2-phase rich in Pt (minor phase). During XRD analysis and use of the Rietveld method, it was found that the α1-phase content is about 98,5 wt.% while the content of α2-phase is 1,5 wt.%. STA analyses show that the Au-Pt-Zn alloy has a solidus temperature of about 1292 K and a liquidus temperature of about 1412 K.
Keywords: Au dental alloy, properties, microstructure, characterization
Published: 03.07.2017; Views: 633; Downloads: 73
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10.
Internal oxidation of silver alloys with tellurium, selenium and sulphur
Gorazd Kosec, Ladislav Kosec, Ivan Anžel, Vasilij Gontarev, Borut Kosec, Milan Bizjak, 2005, original scientific article

Abstract: Silver alloys with tellurium, selenium and sulphur fulfil the conditions for the internal oxidation. Microstructure of these alloys consists of matrix (dilute solid solution) and particles of intermetallic compounds. Internal oxidation of ternary alloys is very similar to that of the binary alloys, but there are also distinctions in thermodynamics properties of alloying elements. At the direct oxidation of the particles of the intermetallic compound the phenomena of the selective oxidation was observed. Concentration of more reactive elements is increasing in the oxidized part of the particles of the intermetallic compound (Te in AgTeSe alloys). Therefore the precipitated oxides formed with diffusional internal oxidation are richer with less reactive alloying element (Se in AgTeSe alloy). In the precipitated oxide particles the concentration of selenium is more than twice higher than of tellurium.
Keywords: internal oxidation, silver, alloys, compound, particle
Published: 03.07.2017; Views: 485; Downloads: 66
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