| | SLO | ENG | Piškotki in zasebnost

Večja pisava | Manjša pisava

Iskanje po katalogu digitalne knjižnice Pomoč

Iskalni niz: išči po
išči po
išči po
išči po
* po starem in bolonjskem študiju

Opcije:
  Ponastavi


1 - 10 / 40
Na začetekNa prejšnjo stran1234Na naslednjo stranNa konec
1.
2.
PRENOVA PROIZVODNEGA PROCESA V OBRATU VALJARNA V PODJETJU ŠTORE STEEL D.O.O.
Klemen Slapšak, 2011, diplomsko delo

Opis: Diplomsko delo obravnava problematiko obrata valjarne v podjetju Štore Steel d.o.o.. Osredotočili smo se na sledenje blaga, skladiščenje, prenovo infrastrukture in povezavo obrata valjarna z obratom hladne predelave. Vsi zaznani problemi so sestavni deli kompleksnega problema, v našem primeru slabe izrabe časa. Pri iskanju rešitev nismo iskali najnovejših tehnologij in postopkov, ampak smo podali praktične rešitve, ki bi podjetju povečale uspešnost. Uvedba RFID tehnologije omogoča nadzor in sledenje polizdelov in izdelkov, ki so skladiščeni po urejenem skladiščnem sistemu. S prenovo infrastrukture je pridobljen prostor, ki je potreben za skladiščenje polizdelkov in izdelkov več različnih dimenzij. Povezava med obratoma prinaša hitrejše oskrbovanje med njima in ureditev materialni tokov v obratu hladne predelave. Realizacija predlaganih rešitev podjetju prinaša dodano vrednost na področju konkurence in notranje organizacije.
Ključne besede: RFID tehnologija, skladiščenje, Štore Steel
Objavljeno: 27.10.2011; Ogledov: 1935; Prenosov: 231
.pdf Celotno besedilo (1,37 MB)

3.
UČINKOVITA RABA ENERGIJE V PODJETJU ŠTORE STEEL
Martin Dobovišek, 2012, diplomsko delo/naloga

Opis: V diplomskem delu je predstavljen energetski pregled porabe glavnih energentov v podjetju Štore Steel, d.o.o., kar je pogoj za nadzor in učinkovito rabo energije. Ker energenti predstavljajo enega izmed glavnih stroškov podjetja, je pametno razmisliti o varčnejši porabi le-teh ter investicijah, ki bi pripomogle k čim večjim izkoristkom, kar posledično pripomore tudi k manjši onesnaženosti okolja.
Ključne besede: Učinkovita raba energije, energija, varčevanje energije, podjetje Štore Steel d.o.o.
Objavljeno: 13.04.2012; Ogledov: 1990; Prenosov: 225
.pdf Celotno besedilo (3,29 MB)

4.
An impedance study of two types of stainless steel in Ringer physiological solution containing complexing agents
Mojca Slemnik, Ingrid Milošev, 2006, izvirni znanstveni članek

Opis: The effect of complexing agents EDTA and citric acid on the electrochemical behaviour of AISI 304 and orthopaedic stainless steels in Ringer physiological solution was investigated by potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS). The content of Mo has a pronounced effect on the corrosion resistance, as evident by the broader passive range of the orthopaedic stainless steel containing Mo. The addition of complexing agents induces significant changes in polarization and impedance characteristics, i.e., the shift of corrosion and breakdown potentials in a more negative direction, an increase in current density, and a significant decrease in charge transfer resistance. The results were interpreted by the formation of soluble complexes of metal ions with chelating agents, especially EDTA, which suppressed the formation of the outer Fe(III) layer of the passive film. The impact of complexing agent on the electrochemical parameters was found to be related to its concentration in electrolyte and the stability constant of the complex formed with the related metal ion.
Ključne besede: resistance, corrosion resistance, stainless steel, orthopedy, potentiodynamic polarization emthod, electrochemical impedance spectroscopy
Objavljeno: 31.05.2012; Ogledov: 873; Prenosov: 43
URL Povezava na celotno besedilo

5.
Cost estimation, optimization and competitiveness of different composite floor systems
Uroš Klanšek, Stojan Kravanja, 2006, izvirni znanstveni članek

Opis: This paper presents self-manufacturing cost estimation, cost optimization and competitiveness of different composite floor systems: composite I beams, composite trusses produced from rolled channel sections and composite trusses made from cold formed hollow sections. Part 1 of this two-part series of papers presents the estimation of the self-manufacturing (direct production) costs for composite and steel structures. The self-manufacturing costs are proposed to be defined as the sum of the material, the power consumption and the labour costs. The material costs of the structural steel, concrete, reinforcement, the shear connectors, electrodes, the anti-corrosion, fire protection and top coat painting, the formwork floor-slab panels and gas consumption are presented in detail. The power consumption costs comprise costs of sawing the steel sections, edge grinding, drilling, welding, stud welding and vibrating the concrete. The labour costs (times) presented define the costs of metal cutting, edge grinding, preparation, assembling and tacking, welding, welding of shear connectors, steel surface preparation and protection, drilling, cutting, placing and connecting the reinforcement, concreting, consolidating and curing the concrete. New approximation functions are proposed for the calculation of some manufacturing times and material consumptions. As the discussed costs vary significantly around the world, the proposed cost expressions are given in the open form to be used for cost estimation in different economic conditions. A numerical example of the estimation of the self-manufacturing costs for a composite I beam floor system shows the suitability of the proposed approach. On the basis of the defined self-manufacturing costs, introduced in Part 1, the cost optimization and the competitiveness of different composite floor systems are discussed in Part 2.
Ključne besede: cost estimation, self-manufacturing costs, material costs, power consumption costs, labour costs, steel structures, composite structures, welded structures
Objavljeno: 30.05.2012; Ogledov: 1312; Prenosov: 18
URL Povezava na celotno besedilo

6.
Modelling and parameter comparison of equivalent circuits on the basis of impedance measurements of stainless steels
Mojca Slemnik, 2006, izvirni znanstveni članek

Opis: In our former work [1] we have discussed the impedance of differently heat treated steels X20Cr13 in 0.1 M H2SO4, undergoing an active passive transition. Impedance spectra were interpreted in terms of a model by Armstrong [2, 3], describing the electrochemical reaction at interfaces with adsorbed intermediates. The present work was performed in order to study this phenomenon in more detail, with computer simulations of a new created and more convenient equivalent circuit in comparison with the former model. Computer simulations of equivalent circuits were also made in the region of passivity which was also continuation of our earlier work [4]. In this sense the entire study for these steels was completed by collating distinctive parameter values, demonstrating electrochemical characteristics of steel X20Cr13, undergoing different heat treatments in the active-passive and passive region.
Ključne besede: electrochemical impedance spectroscopy, equivalent circuits, stainless steel, heat treatment of steel
Objavljeno: 30.05.2012; Ogledov: 1120; Prenosov: 42
URL Povezava na celotno besedilo

7.
Localized dissolution kinetics of low carbon steel
Aljana Petek, Valter Doleček, 2007, izvirni znanstveni članek

Opis: Localized dissolution of low carbon steel in saturated calcium hydroxide with different amount of sodium chloride has been investigated, using a dc technique. Potentiokinetic polarization curves indicated that pitting potentials ($E_{pit}$) decrease linearly with the log of chloride concentration. The rate of pit nucleation (1/$t_i$), and the rate of pits growth increases with increasing concentration of $Cl^-$ ions. Initiation of pitting attack could be ascribed to the adsorption of $Cl^-$ ions on the oxide surface. Adsorption of $Cl^-$ ions is physisorption and follow the Langmuir isotherm with $Δ_{ads}G^0$ = -21.1 kJ/mol.
Ključne besede: pitting corrosion, adsorption isotherm, low carbon steel, simulated interstitial solution
Objavljeno: 31.05.2012; Ogledov: 1293; Prenosov: 36
.pdf Celotno besedilo (105,67 KB)
Gradivo ima več datotek! Več...

8.
Model for fatigue lifetime prediction of torsion bars subjected to plastic presetting
Vinko Močilnik, Nenad Gubeljak, Jožef Predan, 2011, izvirni znanstveni članek

Opis: The torsion presetting of a spring-bar is a common technique for extending the elastic twist-angle and increasing torque, but it reduces fatigue lifetime.Spring-bars are used as shock absorbers in caterpillar machines. Spring-bars, made from high strength fine-grain steel, grade VCN, provide a high level of absorbed energy. Any slight change in the presetting procedure has a strong influence on fatigue-lifetime. Within the same loading range, springs can exhibit low-cyclic or high-cyclic fatigue behavior regarding different presetting levels. A model for fatigue-lifetime and shear-stress levels is proposed on the basis of performed tests. Considering prescribed fatigue tests, it is possible to optimize a spring bar's geometry, in order to survive the required number of cycles.
Ključne besede: presetting, torsion, spring-bars, fatigue, lifetime, cyclic fatigue, torque, spring steel
Objavljeno: 01.06.2012; Ogledov: 896; Prenosov: 42
.pdf Celotno besedilo (931,25 KB)
Gradivo ima več datotek! Več...

9.
Effect of vibration on weld metal hardness and toughness
Bogdan Pučko, Vladimir Gliha, 2005, izvirni znanstveni članek

Opis: Vibration of welded parts is usually applied to achieve effects similar to thermal stress relief. With vibration, it is not only residual stresses that are affected. Using two different welding processes, the influence of vibration on hardness and toughness of the weld was measured. For each weldingprocess, two series of Charpy specimens were made over the temperature range from -60 to +20°C. The only difference between the two series was in performing welding with or without vibration. Slight differences in weld metalhardness were observed. Toughness measurements show an increase in impacttoughness and a significant increase in fracture toughness in samples which were vibrated during welding.
Ključne besede: welding, welded joints, residual stresses, vibrational stress relief, hardness, toughness, steel
Objavljeno: 01.06.2012; Ogledov: 1310; Prenosov: 51
URL Povezava na celotno besedilo

10.
Suspectibility to hydrogen induced cracking of weld beads on high-strength structural steel
Jadranka Malina, Ivan Samardžić, Vladimir Gliha, 2005, izvirni znanstveni članek

Opis: We study the hydrogen embrittlement and rupture of specimens of high-strength low-alloy steel with weld beads subjected to hydrogenation under the conditions of cathodic polarization. The specimens fail in the heat-affected zone on the boundary between the main metal and the weld bead in the zone of application of the latter and, especially, near its end. This explained by a higher hardness of the metal in this zone caused by the specific features of the temperature field formed in the process of welding.
Ključne besede: welding, welded joints, materials, structural steel, cracking, hydrogen
Objavljeno: 01.06.2012; Ogledov: 894; Prenosov: 17
URL Povezava na celotno besedilo

Iskanje izvedeno v 0.3 sek.
Na vrh
Logotipi partnerjev Univerza v Mariboru Univerza v Ljubljani Univerza na Primorskem Univerza v Novi Gorici