Complementary assessment of commercial photoluminescent pigments printed on cotton fabricSelestina Gorgieva
, Natalija Virant
, Alenka Ojstršek
, izvirni znanstveni članek
Opis: The presented study focuses on photoluminescent pigments applied on cotton fabric by a screen-printed procedure using polydimethylsiloxane (PDMS) as a binder. Microscopic data depicts irregular shapes and relatively wide size distribution (3–80 µm) of pigments. Regarding composition,the Energy-Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) spectroscopy data complement findings suggesting the presence of Eu-doped strontium aluminate in the yellow-green,calcium aluminate in the violet pigment, and metal oxides in the blue pigment.
Ključne besede: photoluminescent pigments, cotton fabric, screen-printing, photoluminescent PDMS coating, confocal microscopy, spectroscopy, printed cotton fabrics, pigments
Objavljeno: 08.04.2021; Ogledov: 61; Prenosov: 8
Datoteka (10,19 MB)
Analiza in primerjava Hyperledger ogrodij, temelječih na tehnologiji veriženja blokovDomen Hohler
, 2019, diplomsko delo
Opis: V diplomskem delu se bomo seznanili s tehnologijo veriženja blokov in projekti Hyperledger, ki temeljijo na omenjeni tehnologiji. Tako kot sama tehnologija se tudi ogrodja in orodja Hyperledger nenehno razvijajo. Zaradi svoje uporabnosti in razširljivosti so vse bolj popularna, saj so še posebej namenjena za uporabo v poslovnih okoljih. Namen diplomskega dela je predstavitev vseh trenutnih ogrodij in orodij znotraj projektov Hyperledger. Na podlagi implementacije bomo podrobneje preverili funkcionalnosti in možnosti razvoja na ogrodjih Hyperledger Iroha in Hyperledger Fabric, pri katerem bomo uporabili tudi orodje Hyperledger Composer.
Ključne besede: tehnologija veriženja blokov, ogrodja Hyperledger, poslovna omrežja, Fabric, Iroha
Objavljeno: 22.11.2019; Ogledov: 258; Prenosov: 35
Celotno besedilo (2,88 MB)
Izmenjava elektronskih računov s pomočjo tehnologije veriženja blokov in umestitev v procese organizacijePatrik Ahej
, 2018, magistrsko delo
Opis: V magistrskem delu bomo razvili informacijsko rešitev za izmenjavo elektronskih računov med deležniki s pomočjo tehnologije veriženja blokov. Najprej si bomo pogledali uporabljene tehnologije, s katerimi smo informacijsko rešitev implementirali. Nato bomo spoznali nujne pojme za razumevanje področja in delovanja rešitve za izmenjavo, kot so: elektronski račun, ovojnica, razmerje med deležniki ipd. Sledil bo korak, kjer bomo rešitev za izmenjavo elektronskih računov tudi implementirali. Na koncu pa si bomo pogledali še umestitev rešitve v organizacijo MBILLS d.o.o. ter postopek, ki privede to tega.
Ključne besede: elektronski račun, veriženje blokov, izmenjava datotek, hyperledger fabric, interplanetarni datotečni sistem
Objavljeno: 07.11.2018; Ogledov: 454; Prenosov: 70
Celotno besedilo (3,11 MB)
Micro-scale responses of granular materials under different confining pressures using the discrete element methodMahmud Sazzad
, 2016, izvirni znanstveni članek
Opis: Biaxial compression tests were carried out on assemblies of ovals to study the micro-scale responses of granular materials under different confining pressures using the discrete element method (DEM). A total of 8450 ovals were generated in a rectangular frame without any overlap. Four dense samples were prepared from the initially generated sparse sample under different confining pressures. The simulated results yield a stress-straindilatancy behaviour similar to that observed in sands under different confining pressures. The evolution of the different microparameters and their inter-relationships are established. When the confining pressure is relatively high, the difference between the coordination number and the effective coordination number is very small; however, the difference is apparent for a low confining pressure. The microtopology of the granular assembly at several important states of shear is also reported. It is noted that the topological distribution of the granular materials is confining- pressure dependent. The normalized void-cell number is a minimum under the lowest confining pressure, whereas the same number is a maximum under the highest confining pressure. A linear relationship is observed between the normalized void-cell number and the effective coordination number, regardless of the confining pressures. The evolution of the deviatoric fabric for different confining pressures is measured and the macro-micro relationship is presented.
Ključne besede: microstructures, confining pressure, fabric, microtopology, coordination number, macro-micro relationship
Objavljeno: 15.06.2018; Ogledov: 552; Prenosov: 42
Celotno besedilo (440,72 KB)
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Thermal-mechanical sensory properties of hot-air welded textile transmission linesSimona Jevšnik
, Li Yi
, Junyan Hu
, Han Xiao
, Wu Xinxing
, Anthony Primentas
, 2016, izvirni znanstveni članek
Opis: Hot air welding technology is one of the new promising techniques for integrating conductive yarns on or into fabrics, besides weaving, knitting, printing, coating or inserting conductive yarns by the sewing and/or embroidery processes. A new issue related to the introduction of hot air welding technology for making e-textile transmission lines, i.e., the mechanical-thermal sensory properties of hot air welded e-textile transmission lines, is investigated in this study. Fabric Touch Tester (FTT) was used to evaluate thermal, compressive and bending properties of hot air welded transmission lines. The results show that the bending of welded fabric increased after hot air welding in both warp and weft directions. Furthermore, the maximum thermal flux and thermal conductivity of welded specimens decreased in comparison to the substrate fabric.
Ključne besede: textile transmission lines, hot-air welding, fabric touch tester, conductive yarns, e-textile transmission lines, thermal properties
Objavljeno: 01.09.2017; Ogledov: 485; Prenosov: 305
Celotno besedilo (235,01 KB)
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Sol-gel/Ag coating and oxygen plasma treatment effect on synthetic wound fluid sorption by non-woven cellulose materialZdenka Peršin
, Tanja Pivec
, Miran Mozetič
, Karin Stana-Kleinschek
, 2017, kratki znanstveni prispevek
Opis: Non-woven cellulose material was functionalized using two techniques, i.e. the coating with AgCl via sol-gel and oxygen plasma. The treatment effects were studied regarding the wound fluid adsorption potential using physiological saline, synthetic exudate and synthetic blood. Plasma treatment was most efficient since a significant improvement by absorbency rate and capacity was evident, less pronounced in case of synthetic blood. The combination of both treatments showed a similar trend, while the effects were less prominent, but still sufficient by managing fluid-associated as well as infected wounds.
Ključne besede: non-woven cellulose fabric, sol-gel, oxygen plasma, absorption, synthetic wound fluids
Objavljeno: 31.08.2017; Ogledov: 613; Prenosov: 287
Celotno besedilo (86,21 KB)
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Hemicelluloses application for synthetic polymer surfaces functionalisationNena Dimitrušev
, 2016, doktorska disertacija
Opis: The main aim of this thesis was development of thin functional layers from hemicelluloses xylans on the polyethylene terephthalate (PET) surfaces. Hemicelluloses, xylans, as renewable polymers, were chemically modified in order to introduce anionic and cationic functional groups. Two types of chemical modifications were performed: carboxymethylation in order to increase anionic nature of xylans and improve their hydrophilic character and cationization for introducing of amino groups and antimicrobial characteristics. Both types of modifications were successful, which was proved by ATR FTIR and raman techniques, elemental analysis, total bound nitrogen determination, size exclusion chromatography and polyelectrolyte titrations. Polyelectrolyte titration results showed increased amounts of deprotonated carboxyl groups in carboxymethylated xylans as well as increased amounts of protonated groups in cationized xylans. Antimicrobial activity of xylans was investigated by the determination of minimal inhibitory concentration (MIC) against S. aureus, E. coli, and C. albicans and it was found out that the samples with higher amounts of active amino groups showed lower MIC. Cationised glucuronoxylan showed significantly higher antimicrobial activities against S. aureus in comparison to cationised arabinoxylan and nonmodified xylan samples. However, none of xylan samples was active against fungi. In order to analyze surface properties of solid surfaces, films from xylan (nonmodified and modified) water solution was formed by casting method. The surface chemical composition of films were investigated by x-ray photoelectron spectroscopy (XPS), and the results showed that films made from carboxymethylated xylans had significantly higher amounts of carbon fraction involved in O=C-O bonds, compared to nonmodified xylans. Such surface chemical structure caused higher surface free energy with higher electron-donor contribution and thus high hydrophilicity of these films. Films made by cationized xylans had higher amount of carbon involved in C-C and C-H bonds compared to nonmodified and lower surface free energy with increase of dispersive Lifshitz Van der Waals contribution. In order to thoroughly investigate the adsorption of xylans onto synthetic surfaces Quartz crystal microbalance with dissipation unit (QCM-D) was used. For these measurements model films were prepared from PET by spin coating technique. Adsorption studies were performed at different conditions, such as pH, concentration and ionic strength of xylan solutions. For all the chemically modified xylans the adsorption was improved at pH 5 and with increased ionic strength with divalent ions. The adsorption increased as well with increasing of xylan solution concentration. In order to improve binding of adsorbed xylans so-called anchoring polymers were applied. When anchoring polymers were applied, better adsorption and fixation of adsorbed layer was confirmed, thus the adsorbed masses of xylans after rinsing with water were significantly higher in comparison to the adsorption without immediate anchoring layer. On the basis of these results, real PET fabric surfaces were treated using chemically modified xylans. The xylan solutions were applied onto PET fabric samples using spray coating technique, which is the best approximate to the large-scale procedures. In the first step, PET fabric was activated by alkaline hydrolysis and after that, anchoring agents and carboxymethylated and/or cationized xylans were adsorbed. The success of these treatments was evaluated by the determination of negative and positive charge of the treated PET fabric samples by titration techniques, methylene blue and acid orange 7 adsorption methods, water contact angles and wettability determination. From the potentiometric titrations results it was clearly seen that each new adsorbed layer onto PET fabric totally screened the charge of the former one. FESEM images showed rather thick layers covering the
Ključne besede: hemicellulose, polyethylene terephthalate, glucuronoxylan, arabinoxylan, carboxymethylation, cationization, PET model films, quartz crystal microbalance, PET fabric, surface free energy, wettability, antimicrobial properties
Objavljeno: 11.03.2016; Ogledov: 1215; Prenosov: 82
Celotno besedilo (4,53 MB)
Review of computer models for fabric simulationSimona Jevšnik
, Fatma Kalaoğlu
, Sena Terliksiz
, Jure Purgaj
, 2014, pregledni znanstveni članek
Opis: 3D computer technologies are closely linked to all textile fields ranging from the designing and constructing of fabrics and garments, virtual human body presentations, interactive virtual prototyping to virtual fashion shows and e-trading. This paper offers a review of frequently used methods for fabric simulation. The review is divided into two parts. The first part of the paper comprises currently used techniques, followed by the presentation of basic terms and fabric parameters required for fabric simulations. The second part discusses the approaches and methods for constructing computer models of fabrics. In conclusion, the list of used techniques and parameters for defining a computer fabric model are presented together with given future guidance.
Ključne besede: CAD/CAM in textiles, fabric simulations, fabric models
Objavljeno: 21.12.2015; Ogledov: 728; Prenosov: 392
Celotno besedilo (386,03 KB)
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