| | 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 / 164
Na začetekNa prejšnjo stran12345678910Na naslednjo stranNa konec
1.
Težave pri dostavah gradbenega materiala v podjetju Taliva d.o.o : diplomsko delo visokošolskega strokovnega študijskega programa
Benjamin Plotajs, 2023, diplomsko delo

Opis: V diplomskem delu smo najprej zastavili svoje cilje in namene diplomskega dela. Predstavili smo teoretične osnove, kjer smo se osredotočili predvsem na zakonodajo, ki velja za področje prevozništva. Še zlasti smo se posvetili področju privezovanja tovora, kjer smo izpostavili nepravilnosti, ki se dogajajo pri privezovanju tovora in predstavili, kako pa je treba pravilno varovati tovor na vozilih. V obsegu obstoječega stanja smo se najprej lotili posnetka obstoječega stanja, kjer smo predstavili potek dela v podjetju vse od prihoda različnih vrst blaga v trgovino do dostave teh tovorov strankam. V to je spadala predstavitev manipulacijskih sredstev, tovornega vozila, skladiščenja in dokumentacije, potrebne za izvedbo dostave. V drugem delu predstavitve obstoječega stanja smo izpostavili na težave, na katere naletimo pri svojem delu. Opisali smo način prijave reklamacij, težave pri izvajanju dostav in na kaj vse moramo biti pozorni pri delu s hidravličnim dvigalom. Predstavili smo težave na področju dela s tahografom in napačnimi naslovi dostav, ki nas lahko hitro pripeljejo v neugodno situacijo. Za tem smo podali predloge rešitev, kjer smo se osredotočili na iskanje rešitev za napačne naslove dostav, posodobitve voznega parka ali pa samo posodobitev obstoječega tovornega vozila. Predstavili smo rešitev s povečanjem zaprtega skladišča, na koncu pa smo naredili še stroškovno primerjavo za zamenjavo tovornega vozila.
Ključne besede: dostava, gradbeni material, tovorno vozilo, pritrjevanje tovora, manipulacijska sredstva
Objavljeno v DKUM: 19.02.2024; Ogledov: 46; Prenosov: 2
.pdf Celotno besedilo (3,16 MB)

2.
Nonlinear semi-numeric and finite element analysis of three-point bending tests of notched polymer fiber-reinforced concrete prisms
Žiga Unuk, Milan Kuhta, 2024, izvirni znanstveni članek

Opis: A nonlinear semi-numeric and finite element analysis of three-point bending tests of notched polymer fiber-reinforced concrete prisms was performed. The computational and experimental results were compared in terms of the load-displacement behavior. The vertical midspan displacement and the crack mouth opening displacement results were considered. The nonlinear semi-numeric computational procedure involved the moment-curvature relation, calculated by considering the constitutive material law from the fib Model Code for Concrete Structures 2010, and considered a plastic hinge mechanism to simulate the cracked region behavior. Two sets of tensile mechanical properties were considered for the constitutive material law: back-calculated (by an inverse analysis) tensile strength properties from the experimental results, and tensile strength properties calculated by simplified expressions from the fib Model Code for Concrete Structures 2010. Other mechanical properties were determined by additional compressive tests and standard relations for the dependency of various mechanical properties on the concrete compressive strength. The nonlinear finite element analysis incorporated the Menetrey-Willam material model to simulate the fiber-reinforced concrete behavior. The nonlinear semi-numeric analysis load-displacement results based on the back-calculated tensile strength properties relatively accurately matched with the experimental results, whereas the nonlinear semi-numeric analysis load-displacement results based on tensile strength properties calculated by simplified expressions from the fib Model Code for Concrete Structures 2010 and the nonlinear finite element analysis load-displacement results showed certain shortcomings.
Ključne besede: polymer fiber-reinforced concrete, moment-curvature relation, nonlinear plastic hinge, load-displacement relation, crack width, nonlinear analysis, finite element analysis, Menetrey-Willam material model, three-point bending test, compressive test
Objavljeno v DKUM: 19.02.2024; Ogledov: 54; Prenosov: 4
.pdf Celotno besedilo (6,91 MB)
Gradivo ima več datotek! Več...

3.
Cotton woven fabrics as protective polymer materials against solar radiation in the range of 210–1200 nm
Polona Dobnik-Dubrovski, Darinka Fakin, Alenka Ojstršek, 2023, izvirni znanstveni članek

Opis: The proposed paper describes the influence of woven fabric constructional parameters (type of weave, relative fabric density) and colouration (obtained by eco-friendly dyeing) on the solar transmittance of cotton woven fabrics in the range of 210-1200 nm. The cotton woven fabrics in their raw state were prepared according to Kienbaum's setting theory, at three levels of relative fabric density and three levels of the weave factor, and then exposed to the dyeing process with natural dyestuffs (beetroot, walnut leaves). After ultraviolet/visible/near-infrared (UV/VIS/IRA) solar transmittance and reflection in the range of 210-1200 nm were recorded, the influence of the fabric construction and colouration were analysed. The guidelines for fabric constructor were proposed. The results show that the walnut-coloured satin samples at the third level of relative fabric density provide the best solar protection in the whole solar spectrum. All the tested eco-friendly dyed fabrics offer good solar protection, while only raw satin fabric at the third level of relative fabric density can be classified as solar protective material with even better protection in IRA region than some coloured samples.
Ključne besede: fabric engineering, solar protection, woven fabric structure, natural dyeing of polymer material, testing
Objavljeno v DKUM: 15.02.2024; Ogledov: 67; Prenosov: 0
.pdf Celotno besedilo (1,93 MB)
Gradivo ima več datotek! Več...

4.
Modelling of unit differential reversal curves in the G2E hysteresis model
Ermin Rahmanović, Martin Petrun, 2024, izvirni znanstveni članek

Opis: Iron losses represent a crucial factor in the design process of electrical machines. For this reason, it is important to consider adequate hysteresis behavior within models which predict iron losses. A promising hysteresis description is the static hysteresis model developed by the G2Elab research group. It proposes a unique approach of modelling magnetization curves inside the major loop based on the so-called unit differential reversal curves (uDRCs). This work focuses on modelling of the uDRCs. We analyzed the accuracy and identification approaches of several uDRC models, where we compared the established model with simplified solutions with less parameters. Further, we analyzed the impact of individual models regarding identification convergence. Finally, we highlighted which simplified models give the best trade-off between the ease and stability of identification process of parameters, and the accuracy of the hysteresis model.
Ključne besede: static hysteresis model, iron loss, loss surface model, magnetic material, mathematical modelling
Objavljeno v DKUM: 26.01.2024; Ogledov: 79; Prenosov: 11
.htm Celotno besedilo (154,34 KB)

5.
Vpliv dodajanja zaposlitvenih predmetov na dobro počutje odstavljenih pujskov : diplomsko delo
Nejc Kuri, 2023, diplomsko delo

Opis: Obogatitev okolja je ena od metod, ki se uporablja za ublažitev agresije pri odstavitvi mladih pujskov, ki običajno izbruhne, ko jih mešamo iz neznanih gnezd, ter negativno vpliva na rastnost in dobro počutje pujskov. V diplomskem delu smo preizkusili preprost pristop s povečanjem količine obstoječih obogatitvenih predmetov za ublažitev agresije po odstavitvi. V vsaki od 10 ponovitev (5 kontrolnih, 5 testnih) smo v odstavitveni boks skupaj odstavili 3 ali 4 gnezda. V kontrolni skupini smo za obogatitev uporabili en viseč plastični predmet rdeče barve in en kos smrekovega lesa. Pri testu je bila obogatitev pomnožena glede na število odstavljenih gnezd. Med poskusom smo spremljali parametre agresije (grizenje repov, poškodbe/rane, šepavost) in pogostost pojavljanja različnih vrst interakcij (pozitivne, negativne, ukvarjanje z opremo/predmeti za zaposlitev), in sicer 1., 3., 5., 7., 14. in 21. dan po odstavitvi. Na koncu poskusa (21. dan po odstavitvi) smo ocenili še splošno stopnjo dobrega počutja pujskov z uporabo protokola Welafre Quality®. V testni skupini smo zabeležili 4-kratno povečanje ukvarjanja pujskov s predmeti za zaposlitev. Posledično je bilo 5-krat manj negativnih interakcij in 50 % manj šepanja in ran/poškodb na telesu, vključno z znaki grizenja repov. Tudi splošna stopnja počutja pujskov je bila višja v testni skupini. Uporabljena obogatitev boksa, prilagojena številu odstavljenih gnezd, se je izkazala za učinkovit način izboljšanja dobrega počutja odstavljenih pujskov.
Ključne besede: pujski, odstavitev, zaposlitveni material, igrače, dobro počutje živali
Objavljeno v DKUM: 05.01.2024; Ogledov: 159; Prenosov: 9
.pdf Celotno besedilo (2,58 MB)

6.
An analysis of the responsibility for zero waste
Ivana Tršelič, Daniel Rolph Schneider, Niko Samec, Filip Kokalj, 2019, izvirni znanstveni članek

Opis: European Union Directive 2008/98/EC sets the priority hierarchy of the prevention of waste, re-using waste, recycling waste, waste recovery, and waste disposal. Although every one of us is in daily contact with waste, we do not have the knowledge that can lead us to the sound management of waste from the beginning, before products are identified as waste. Zero waste is a fundamental concept of the sustainable community of the future. It is a phrase frequently used by politicians seeking to upgrade the municipal solid waste management systems in their communities. In this manner, the responsibility of zero waste is given to the waste management process instead of to householders. Householders then equate waste prevention with recycling and the proper waste management of the collectors, public services, or waste management company. In reality, zero waste starts with each one of us at home. Households should aim to reduce consumption and undertake repairs to extend the life span of products. Behaviour change can only start with knowledge. In reality, waste prevention does not include recycling. Recycling leads to a combined reduction of waste brought to landfill and raw material extraction. The present paper evaluates household waste to clarify the facts. It analyses the composition of three streams: municipal solid waste, separately collected packaging waste, and bulky waste in different regions of Slovenia. The research defines waste into five different categories. The first category is waste that can and should be avoided. The second category is waste that can be re-used. Further on, the research expands by researching the market of the third category that defines recyclables, which waste can be recycled; the last two categories are the waste that we are fighting with at the end of the waste management process, either to make it to the waste-to-energy process or to comply with landfill restrictions. At the end of the research, we summarize the situation of household waste in 2018. Our goal is to reduce the quantity of waste, making only waste that can be recycled. If we consider waste prevention to be a fight against waste, we can put our plan in place by taking the first step: getting to know our enemy.
Ključne besede: municipal solid waste, zero waste, recycling, lightweight packaging waste, waste management, material recovery
Objavljeno v DKUM: 05.12.2023; Ogledov: 178; Prenosov: 5
.pdf Celotno besedilo (463,42 KB)
Gradivo ima več datotek! Več...

7.
Production of artificial cold for industry, based on the magnetocaloric effect
Dorin Botoc, Ionut-Bogdan Rusu, Adrian Plesca, Jurij Avsec, 2020, izvirni znanstveni članek

Opis: The most common current technology for producing artificial cold is based on the operation of gas compression and absorption, which was discovered more than a century ago. This technology uses refrigerants as a heat transfer agent. Magnetic refrigeration is an innovative technology that works based on the magnetocaloric effect and the properties of certain rare materials/metals. The present paper describes a simulation of the magnetocaloric effect (MCE) of a gadolinium plate (Gd.), which is the main component of the active magnetic regenerator (AMR). The first part includes a description and history of the discovery of the magnetocaloric effect of materials that possess such properties. The continuation is a COMSOL Multiphysics modelling of AMR's main component: a gadolinium (Gd) plate. The simulation of the magnetocaloric effects and the heat dispersion on its surface was done in COMSOL, as was the highlighting of the adiabatic temperature on the flat surface of the plate. Water was used as a heat transfer agent, and gadolinium (Gd) was used as a reference criterion for the materials. The model simulates a single step of the magnetic refrigeration cycle and evaluates the AMR's performance with a single board. This study enables identifying the most important characteristics that influence the active magnetic regenerator's thermal behaviour.
Ključne besede: energy efficiency, magnetocaloric material, magnetic refrigeration, active magnetic regenerator
Objavljeno v DKUM: 04.12.2023; Ogledov: 111; Prenosov: 4
.pdf Celotno besedilo (2,53 MB)
Gradivo ima več datotek! Več...

8.
A regenerator used in the installation of magnetic refrigeration devices
Dorin Botoc, Jurij Avsec, Adrian Plesca, 2020, strokovni članek

Opis: In this article, the mechanism and functioning of a refrigeration system based on the magnetic system and the magnetocaloric effect are examined. Magnetic refrigeration plants operate based on a state-of-the-art technology that does not contain any toxic refrigerant that is harmful to the environment and the ozone layer. The magnetocaloric effect is created by a rare earth metal called gadolinium. We have studied the benefits of using this type of mechanism for both domestic and industrial needs. High efficiency, net energy consumption lower than the classic, silent systems, and a lack of typical refrigerant characterize this type of installation. The following layout describes the initial prototype for AMR in magnetocaloric refrigeration.
Ključne besede: energy efficiency, gadolinium material, magnetocaloric effect, alternative technology, AMR
Objavljeno v DKUM: 01.12.2023; Ogledov: 183; Prenosov: 5
.pdf Celotno besedilo (1,19 MB)
Gradivo ima več datotek! Več...

9.
Povečanje energetske učinkovitosti in postavitev procesa obdelave granuliranega materiala v končni produkt : magistrsko delo
Jana Stanič, 2023, magistrsko delo

Opis: Dandanes so procesi proizvodnje granuliranih materialov ključni v številnih obratih zato je pomembno, da so sistemi pravilno načrtovani in dimenzionirani za njihovo optimalno delovanje. To zahteva upoštevanje ustreznih masnih tokov, volumskih pretokov in moči naprav, ki so vključene v proces. V magistrskem delu je predstavljena masna in energijska bilanca procesa obdelave granuliranega materiala, ter postavitev le-tega v končni produkt. V delu je prav tako predstavljen način, kako s prisilnim hlajenjem končnega produkta povečati energetsko učinkovitost procesa.
Ključne besede: granulirani material, masna bilanca, energijska bilanca
Objavljeno v DKUM: 28.11.2023; Ogledov: 233; Prenosov: 16
.pdf Celotno besedilo (1,74 MB)

10.
Prenova sistema za upravljanje zaloge kemičnega potrošnega materiala
Rok Požun, 2023, diplomsko delo

Opis: V diplomskem delu smo predstavili rešitev za prenovo sistema za upravljanje zalog kemičnega potrošnega materiala s pomočjo naprednejšega digitalnega sistema. Pred uvedbo novega sistema smo podatke o porabi kemičnega potrošnega materiala zbirali ročno, s pisanjem v zvezek ali na list papirja. Diplomska naloga se osredotoča na temo prenove sistema za upravljanje zalog in porabe kemičnega potrošnega materialov v velikem farmacevtskem podjetju. V uvodnem delu smo predstavili informacijski sistem za vodenje skladišč, ki je osnova za naše nadaljnje raziskave. V osrednjem delu diplomske naloge smo analizirali prednosti in slabosti trenutnega sistema za evidentiranje zalog kemičnega porabe materiala ter predstavili prototipno rešitev sistema za upravljanje zalog kemičnega potrošnega materiala. S tem diplomskim delom smo želeli prispevati k izboljšanju procesov upravljanja zalog v našem farmacevtskem podjetju in omogočiti večjo sledljivost in učinkovitost pri porabi kemičnih materialov. Implementacija novega sistema omogoča skrbniku za naročanje kemičnega potrošnega materiala večjo sledljivost in preprostejši dostop do informacij, kar povečuje učinkovitost proučevanega procesa.
Ključne besede: kemični potrošni material, sistem, MS Excel, evidentiranje.
Objavljeno v DKUM: 24.11.2023; Ogledov: 199; Prenosov: 9
.pdf Celotno besedilo (2,84 MB)

Iskanje izvedeno v 1.71 sek.
Na vrh
Logotipi partnerjev Univerza v Mariboru Univerza v Ljubljani Univerza na Primorskem Univerza v Novi Gorici