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Iskalni niz: "ključne besede" (odprti dostop) .

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1.
Uvodnik
David Ožura, 2023, predgovor, uvodnik, spremna beseda

Ključne besede: znanstvene revije, založništvo, medicina, onkologija, odprti dostop, indeksiranje, mednarodne bibliografske zbirke, uvodniki
Objavljeno v DiRROS: 08.01.2024; Ogledov: 139; Prenosov: 68
.pdf Celotno besedilo (219,94 KB)
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2.
Investigation of the British pendulum calibration uncertainty by Monte Carlo simulation
Vid Primožič, Miha Hiti, 2022, izvirni znanstveni članek

Povzetek: The paper presents the evaluation of the calibration uncertainty of the British pendulum slip resistance tester using Monte Carlo simulation method. A mathematical model was produced which describes pendulum behavior based on its calibration parameters. The Monte Carlo simulation, programmed in Python, was used for simulating the effect of each of the calibration parameters adjustment within their tolerance intervals, with uniform and triangular probability distribution. Four different tolerance limits were compared: limits from a current international standard, a proposition with reduced limits from recent literature, and two novel propositions, one with reduced but easily achievable limits, and a second one for best practically achievable limits. The results of the simulation show a fundamental standard uncertainty contribution of about 2.8% for pendulum calibration according to current standard limits. Furthermore, they suggest a possible improvement to 0.5%–0.7% as its best practical direct calibration standard uncertainty for reduced limits.
Ključne besede: British pendulum, simulacija, Monte Carlo, merilna negotovost, odprti dostop
Objavljeno v DiRROS: 20.06.2023; Ogledov: 276; Prenosov: 150
.pdf Celotno besedilo (1,75 MB)
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3.
The preparation and characterization of low-temperature foams based on the alkali activation of waste stone wool
Majda Pavlin, Barbara Horvat, Mark Češnovar, Vilma Ducman, 2022, izvirni znanstveni članek

Povzetek: Waste mineral wool represents a huge amount of construction and demolition waste that is still not adequately returned into the value chain but needs to be landfilled. In the present study, waste stone wool (SW) was evaluated for the preparation of alkali-activated foams. For this purpose SW was milled and sieved below 63 μm, then the activator (sodium silicate) and different amounts of foaming agent (hydrogen peroxide, H2O2), varying between 1 wt% and 3 wt%, were added to the slurry and cured in moulds at an elevated temperature (70 ◦ C) for three days. In this way, foamed, highly porous materials were obtained whose density and mechanical properties were influenced by the amount of foaming agent used. The densities obtained ranged between 1.4 and 0.5 g/cm3, with corresponding mechanical properties of between 12.6 and 1.5 MPa and total porosities in the range 37.8–78.6%, respectively. In the most porous samples with the total porosity of 78.6%, a thermal conductivity of 0.092 W/(m∙K) was confirmed. The study confirmed the suitability of waste mineral wool (in our case SW) as a precursor for alkali-activated foams with potential use in the construction sector or other industrial applications.
Ključne besede: alkali activation, waste mineral wool, mechanical strength, open access, alkalijska aktivacija, odpadna volna, SEM, XRF, XRD, mehanska trdnost, odprti dostop
Objavljeno v DiRROS: 19.06.2023; Ogledov: 238; Prenosov: 181
.pdf Celotno besedilo (9,47 MB)
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4.
Corrosion and protection of non-patinated, sulphide- and chloride-patinated bronze
Živa Novak, Tadeja Kosec, 2022, izvirni znanstveni članek

Povzetek: The surface of bronze undergoes changes when it is exposed to a polluted atmosphere, and bronze should therefore be protected from this natural deterioration. The most common protective coating currently in use is Incralac, which includes toxic components and is reported to dissolve a few months after application. This work therefore investigates a fluoropolymer-based coating (FA-MS), and compares it to the protection offered by Incralac. Bronze samples (non-patinated, sulphide-patinated or chloride-patinated) were exposed to simulated urban rain for four months. The corrosion products formed were characterised using SEM/EDS and Raman analyses. To study the protection efficiency of the newly developed fluoropolymer coating (FA-MS) and Incralac protection, various electrochemical methods were used: measurements of open circuit potential linear polarisation and potentiodynamic measurements. Findings show that the FA-MS coating provides a protection efficiency of 71 % for chloride-patinated bronze and 99.5 % for sulphide-patinated bronze. Contact angles of the FA-MS samples were higher than those of the unprotected samples or the samples protected by Incralac, indicating better hydrophobic properties of the FA-MS coating.
Ključne besede: bronze, corrosion, SEM/EDS analyses, Raman spectroscopy, electrochemistry, odprti dostop
Objavljeno v DiRROS: 31.05.2023; Ogledov: 299; Prenosov: 110
.pdf Celotno besedilo (1,30 MB)
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5.
Potencial zelenega vodika v stavbnem sektorju
Dragica Marinič, 2023, izvirni znanstveni članek

Povzetek: Številne države se zavezujejo k trajnostnemu razvoju in podnebni nevtralnosti, pri čemer so rešitve za energetske in okoljske izzive ključne za prehod v brezogljično gospodarstvo ter družbo. Energetska kriza in visoke cene energije so vplivale na pospešitev prehoda na čisto in trajnostno energijo. Izziv energetsko odvisne Evrope je v iskanju novih načinov pridobivanja energije iz obnovljivih virov energije in ob zavedanju, da obstoječa proizvodnja in poraba energije povzročata več kot 75 % emisij toplogrednih plinov v Evropski uniji. Med večje porabnike energije spada tudi gradbeništvo s stavbnim sektorjem, ki prispeva velik ogljični odtis. Pri uvajanju tehnologij obnovljivih virov energije nam je lahko v pomoč obnovljivi, zeleni nizkoogljični vodik zaradi svoje prilagodljivosti kot nosilec energije in medij za shranjevanje. Z njegovo uporabo lahko prispevamo k stroškovno učinkovitem razogljičenju Evropske unije in zmanjšanju njene odvisnosti od uvoza fosilnih goriv. Raba zelenega vodika pri ogrevanju stavb je v začetni fazi testiranja. S podporo zakonodaje in strategij na evropski in nacionalnih ravneh, tehnološkimi raziskavami in inovacijami, pametnim upravljanjem virov in pametno potrošnjo bomo lahko izboljšali industrijske ekosisteme, zmanjšali tveganja in prispevali k neto ničelnim emisijam. Namen prispevka je prikazati posamezne praktične primere uporabe zelenega vodika v stavbnem sektorju, pri čemer imajo pomembno vlogo zakonodaja, naložbe v infrastrukturo in proizvodnjo, varnost ter potrebe na trgu.
Ključne besede: energija, obnovljivi viri energije, vodikove tehnologije, zeleni vodik, stavbe, razogljičenje, odprti dostop
Objavljeno v DiRROS: 30.05.2023; Ogledov: 328; Prenosov: 151
.pdf Celotno besedilo (2,55 MB)
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6.
Mode I fracture of beech-adhesive bondline at three different temperatures
Jaka Gašper Pečnik, Andreja Pondelak, Michael David Burnard, Václav Sebera, 2022, izvirni znanstveni članek

Povzetek: Single edge-notched three-point bending tests (SEN-TPB) for mode I were utilized to experimentallyevaluate fracture properties of adhesive bondlines in European beech (Fagus SylvaticaL.). Thebondline was examined at two anatomical planes with TR and RT orientation and at control andtwo elevated temperatures (70°C and 140°C). Among epoxy (EPI), melamine-urea formaldehyde (MUF), and polyurethane (PUR) adhesives, the highest average critical energyGcwith 0.80 N/mmand fracture energyGfwith 1079.4 N/mm were obtained for EPI in the TR plane and understandard climate conditions (20°C/65% relative humidity), followed by MUF (Gc= 0.50 N/mm andGf= 620 N/mm) and PUR (Gc= 0.25 N/mm andGf= 290.9 N/mm), respectively. PUR was leasteffected by elevated temperature, and no significant differences forGcandGfbetween TR and RTbondline orientations were found for MUF and PUR treated at 20°C/65% relative humidity whilecomparisons between other factors varied significantly. Treatment of specimens at elevatedtemperatures resulted in reduced fracture performance regardless of wood grain orientation orthe adhesive system.
Ključne besede: crack, fracture, grain orientation, temperature, European Beech, odprti dostop
Objavljeno v DiRROS: 03.05.2023; Ogledov: 412; Prenosov: 331
.pdf Celotno besedilo (3,32 MB)
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7.
Zaznamek o senčnih knjižnicah
Ana Inkret, 2021, polemika, diskusijski prispevek, komentar

Ključne besede: senčne knjižnice, odprti dostop, znanstveno založništvo
Objavljeno v DiRROS: 08.04.2021; Ogledov: 1771; Prenosov: 570
.pdf Celotno besedilo (505,18 KB)

8.
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