1. Proizvodnja sintetičnega bencina iz trdnih komunalnih odpadkovMonika Uremović, 2024, master's thesis Abstract: Fosilna goriva so neobnovljivi energetski viri (premog, nafta, zemeljski plin in njihovi derivati), ki so nastali iz starodavnih rastlin in živali. Ta goriva so ključna za današnjo energetsko porabo, saj zagotavljajo okoli 80 % svetovne energije. Kljub njihovemu prispevku k industrializaciji in razvoju imajo negativen vpliv na okolje in podnebje, saj sproščajo ogljik v atmosfero. Fosilna goriva so omejen vir, ki se ne more hitro obnavljati, zato postaja prehod na obnovljive vire, kot sta sončna in električna energija, vse bolj nujen.
Naraščajoče svetovno prebivalstvo povzroča hitro večanje števila trdnih komunalnih odpadkov in s tem povezanih problemov ‒ onesnaževanje okolja, naraščajoči stroški in kopičenje odlagališč z odpadki. V ta namen bi v okviru krožnega gospodarstva razvili alternativne načine obdelave, s katerimi bi zmanjšali količino odpadkov in jih pretvorili v različne vrste energij.
Namen magistrskega dela je izvesti različne simulacije proizvodnje sintetičnega bencina iz trdnih komunalnih odpadkov, od sortiranih, delno sortiranih do nesortiranih, s pomočjo programa Aspen Plus pri različnih pogojih obratovanja (tlak in temperatura).
Najprej smo izvedli simulacije proizvodnje sintetičnega bencina pri sortiranih trdnih komunalnih odpadkih, kjer smo nadalje opazovali vpliv na proizvodnjo s spreminjanjem temperature oziroma tlaka. Nato smo izvedli še simulacijo proizvodnje sintetičnega bencina iz sortiranih trdnih komunalnih odpadkov z uporabo ogljikovega dioksida, predhodno pridobljenega iz dimnih plinov s separacijo na koloni PSA. Na koncu smo izvedli še simulacije proizvodnje sintetičnega bencina iz delno in še nesortiranih trdnih komunalnih odpadkov.
Ugotovitve so pokazala, da so bili najboljši rezultati pri simulaciji proizvodnje sintetičnega bencina iz sortiranih trdnih komunalnih odpadkov z uporabo ogljikovega dioksida iz dimnih plinov, ki je bil predhodno pridobljen s separacijo na koloni PSA. Prav tako so rezultati pokazali, da se proizvodnja zmanjšuje s povečanjem temperature pri istem tlaku in obratno povečuje s povečanjem tlaka pri isti temperaturi.
Keywords: sintetičen bencin, sintezni plin, trdni komunalni odpadki, dimni plini, krožno gospodarstvo, simulacija, Aspen Plus
Published in DKUM: 09.10.2024; Views: 0; Downloads: 5
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2. Vloga šolskega svetovalnega delavca pri zdravju učencev v osnovni šoli : magistrsko deloKatarina Zemljič, 2024, master's thesis Abstract: Magistrsko delo se osredotoča na vlogo šolskega svetovalnega delavca pri zdravju učencev v osnovni šoli. Ker je zdravje povezano z zdravim življenjskim slogom, smo se nanj navezali in v teoretičnem delu navedli dejavnike zdravega življenjskega sloga. Zdrav življenjski slog je še posebej pomemben v otroštvu in mladostništvu, saj se v teh obdobjih oblikuje temelj za kasneje. Po drugi strani na zdravje vplivajo dejavniki tveganja, ki smo jih našteli in opisali ter poudarili, da nezdrav življenjski slog s seboj prinaša številne negativne posledice, ki se začnejo kazati šele v odrasli dobi. Predstavili smo vlogo šolskega svetovalnega delavca glede na posamezni dejavnik zdravega življenjskega sloga. Šolski svetovalni delavci namreč s svojim delovanjem na različne načine krepijo učenčevo telesno zdravje, spodbujajo k telesni aktivnosti in zdravi prehrani, zagotavljajo podporo pri duševnem zdravju in seznanjajo o posledicah pomanjkanja spanja. So eden izmed ključnih elementov pri seznanjanju in spodbujanju zdravega življenjskega sloga in nepogrešljiv člen v šolskem prostoru. V empiričnem delu smo prikazali rezultate raziskave, v kateri je sodelovalo 116 šolskih svetovalnih delavcev, ki so zaposleni v osnovnih šolah po Sloveniji.
Keywords: šolska svetovalna služba, učenec, zdravje, zdrav življenjski slog, dejavniki tveganja za zdravje
Published in DKUM: 03.10.2024; Views: 0; Downloads: 9
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3. Proizvodnja etanola iz bioplinaAjda Raj Miloševič, 2024, master's thesis Abstract: V zadnjem času se pospešeno raziskujejo možnosti pridobivanja energije, goriv in raznih kemikalij iz bioplina. Bioplin, ki je sestavljen predvsem iz CH4 in CO2, lahko uporabimo za proizvodnjo sinteznega plina, iz katerega pa lahko pridobivamo etanol. Etanol se lahko uporablja kot alternativno gorivo za motorna vozila in za ogrevanje stanovanj. V hrani in pijači deluje kot konzervans ali sredstvo za aromatiziranje. Prav tako pa se pogosto uporablja kot surovina v kemijski in farmacevtski industriji.
V okviru magistrske naloge smo obravnavali proizvodnjo etanola iz bioplina. Osnovni cilj magistrske naloge je bil določiti optimalne pogoje za proizvodnjo etanola iz bioplina s pomočjo programa Aspen Plus. V ta namen smo izvedli numerično simulacijo proizvodnje etanola pri različnih obratovalnih pogojih (temperatura, tlak) in pri različnih sestavah vhodne surovine (količina dodanega CO2 in vodne pare). Z analizo teh vplivnih parametrov smo določili optimalne pogoje za proizvodnjo etanola.
Dobljeni rezultati kažejo, da največjo količino nastalega etanola dosežemo pri temperaturi 200 °C, tlaku 50 bar, količini dodanega CO2 300 kmol/h in pri količini dodane vodne pare 400 kmol/h. Pri teh optimalnih vrednostih vplivnih faktorjev se lahko količina proizvedenega etanola poveča tudi do 15 %.
Keywords: bioplin, sintezni plin, proizvodnja etanola, simulacija z Aspen Plus, optimiranje
Published in DKUM: 25.09.2024; Views: 0; Downloads: 6
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4. Učni načrtMarjeta Kovač, Nives Markun Puhan, Breda Lorenci, Leonida Novak, Jurij Planinšec, Iztok Hrastar, Karmen Pleteršek, Vesna Muha, 2011, professional monograph Abstract: Učni načrt
Keywords: športna vzgoja, osnovna šola, učni načrt
Published in DKUM: 12.09.2024; Views: 27; Downloads: 3
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5. Differences in subject-specific competences between Slovenian and Italian physical education teachersMarjeta Kovač, Bojan Leskošek, Gregor Jurak, Miha Marinšek, Miloš Tul, 2021, original scientific article Abstract: This cross-sectional study was designed to analyse the differences between the subject-specific competences of Slovenian and Italian physical education (PE) teachers. The participants, 669 Slovenian and 484 Italian PE teachers, evaluated their professional competences with a self-administered questionnaire on a four-level Likert scale. A t-test for independent samples indicates differences in the self-evaluations of the majority of subject-specific competences between both groups. However, in almost all items, Slovenian PE teachers evaluate their competences higher. A multivariate analysis of variance, used to identify the role of some socio-demographic factors (state, gender, years of service), shows that the state has the highest impact on the differences between self-efficiency of both groups (p<0.001, Eta2=0.531). The greatest differences (Cohen's d > 0.8) are observed on those competences that relate to some of the narrower aspects of PE didactics. The reasons for the perceived differences can be found in some historical and social events, length of education, the different orientation of PE teacher education programmes, and the different responses of both countries to educational policies. The present study outcomes may aid in updating initial PE teacher training and designing a creative system of continuous professional development.
Keywords: physical education, educators, self-efficiency, cross-cultural study
Published in DKUM: 04.09.2024; Views: 41; Downloads: 4
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6. Association between one's attachment to parents and subsequent attachment to a partnerJernej Kovač, Marija Javornik, 2021, original scientific article Abstract: The primary purpose of this study was to explore the association between individuals' attachments to their mothers and fathers, and their subsequent attachments to partners, based on research conducted in Slovenia. Participants in the empirical study were antenuptial couples who attended the premarital counselling course organized by and offered through the Franciscan Family Institute in Ljubljana, Slovenia. In order to explore more fully the concept of attachment, the authors of the study focused on the following dimensions: trust, communication and estrangement. The results of the study showed greater similarities in the three identified dimensions to the way in which both women and men experience attachment to their mothers and partners, while there were marked differences in the subjects' experience of attachment to their fathers.
Keywords: family, attachment, children, parents, mothers, fathers
Published in DKUM: 04.09.2024; Views: 43; Downloads: 3
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7. Potentiometric surfactant sensor with a pt-doped acid-activated multi-walled carbon nanotube-based ionophore nanocompositeNada Glumac, Milan Momčilović, Iztok Kramberger, Darko Štraus, Nikola Sakač, Elvira Kovač-Andrić, Bojan Đurin, Marija Kraševac Sakač, Kristina Đambić, Marija Jozanović, 2024, original scientific article Abstract: Two new surfactant sensors were developed by synthesizing Pt-doped acid-activated multiwalled carbon nanotubes (Pt@MWCNTs). Two different ionophores using Pt@MWCNTs, a new plasticizer, and (a) cationic surfactant 1,3-dihexadecyl-1H-benzo[d]imidazol-3-ium-DHBI (Pt@MWCNT-DHBI ionophore) and (b) anionic surfactant dodecylbenzenesulfonate-DBS (Pt@MWCNT-DBS ionophore) composites were successfully synthesized and characterized. Both surfactant sensors showed a response to anionic surfactants (dodecylsulfate (SDS) and DBS) and cationic surfactants (cetylpyridinium chloride (CPC) and hexadecyltrimethylammonium bromide (CTAB)). The Pt@MWCNT-DBS sensor showed lower sensitivity than expected with the sub-Nernstian response of ≈23 mV/decade of activity for CPC and CTAB and ≈33 mV/decade of activity for SDS and DBS. The Pt@MWCNTDHBI surfactant sensor had superior response properties, including a Nernstian response to SDS (59.1 mV/decade) and a near-Nernstian response to DBS (57.5 mV/decade), with linear response regions for both anionic surfactants down to ≈2 × 10−6 M. The Pt@MWCNT-DHBI was also useful in critical micellar concentration (CMC) detection. Common anions showed very low interferences with the sensor. The sensor was successfully employed for the potentiometric titration of a technical grade cationic surfactant with good recoveries. The content of cationic surfactants was measured in six samples of complex commercial detergents. The Pt@MWCNT-DHBI surfactant sensor showed good agreement with the ISE surfactant sensor and classical two-phase titration and could be used as an analytical tool in quality control
Keywords: potentiometric surfactant sensor, metal-doped MWCNT, surfactants, carbon nanocomposite, sensors
Published in DKUM: 23.08.2024; Views: 110; Downloads: 5
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8. Changes in use of communication channels by livestock farmers during the COVID-19 pandemicKarmen Erjavec, Marjan Janžekovič, Milena Kovač, Mojca Simčič, Andrej Mergeduš, Dušan Terčič, Marija Klopčič, 2021, original scientific article Abstract: The study aims to identify any changes in the communication channels used by Slovenian livestock farmers before and during the COVID-19 pandemic, as well as the main (dis)advantages of relying on them. An online survey was completed by 502 Slovenian farmers of various farm enterprises in winter 2020/2021. Most respondents generally used telephone, e-mail, and the internet to obtain agricultural information before and during the COVID-19 pandemic. During the pandemic, farmers increasingly relied on online conferences and social networking sites. At the same time, younger farmers and farmers with a higher education level used digital channels the most frequently, with men doing so more often than women. Digital channels were primarily used by cattle and horse farmers, while cattle farmers showed the greatest online conference participation. Respondents reported having more time to spend with their families and animals as an advantage and the lack of face-to-face interaction with other farmers and advisers as a disadvantage of such communication patterns. As the study reveals differences in the use of communication channels during the COVID-19 pandemic by various farmers, a new communication strategy is needed that involves the use of appropriate communication channels to provide farmers with agricultural information both during the COVID-19 situation and later.
Keywords: COVID-19 pandemic, livestock farmers, communication channels, (dis)advantages of communication
Published in DKUM: 12.08.2024; Views: 80; Downloads: 12
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9. Življenjska zgodba kot metoda raziskovanja v izobraževanju odraslih : magistrsko deloPetra Očko, 2024, master's thesis Abstract: V zaključnem delu smo se ukvarjali s proučevanjem izobraževanja odraslih v luči življenjskih izpovedi udeležencev izobraževanja odraslih. Teoretični del smo razdelili na dva dela, kjer smo v prvem delu podrobneje raziskali določene ključne vidike izobraževanja odraslih, in sicer od splošne opredelitve definicije izobraževanja odraslih do opredelitve specifičnih metod dela samih izobraževalcev ter lastnosti izobraževancev. V drugem delu smo podrobneje opredelili kvalitativno raziskovanje in pojem življenjske zgodbe. V empiričnem delu smo izvedli sedem nestrukturiranih intervjujev v obliki življenjske zgodbe z udeleženci izobraževanja odraslih. Rezultate intervjujev smo obdelali s kvalitativno vsebinsko analizo. Ugotovili smo, da so se vsi izmed intervjuvanih posameznikov za izobraževanje v odrasli dobi v večinski meri odločili samoiniciativno, tekom izobraževanja pa so bili visoko notranje motivirani. Raziskava je pokazala, da so nekateri izobraževalni programi bolj prilagojeni potrebam odraslih kot drugi. Ugotovili smo še, da so se odrasli v določenem obsegu, delno zaradi ciljno usmerjenega učenja in delno zaradi že pridobljenih življenjskih izkušenj, učili lažje, kot v mladosti. Rezultati naše kvalitativne raziskave so potrdili teoretičen okvir predelane literature s področja izobraževanja odraslih, in sicer da mora učinkovito izobraževanje odraslih prepoznati ter izkoristiti edinstvene značilnosti odraslih učencev, vključno z njihovo potrebo po praktični uporabnosti, spoštovanju njihovih izkušenj in upoštevanju njihovih časovnih ter življenjskih omejitev. Izobraževalni programi morajo biti fleksibilni, relevantni in odzivni na raznolike potrebe odraslih.
Keywords: izobraževanje odraslih, življenjska zgodba, motivacija, kvalitativno raziskovanje
Published in DKUM: 09.07.2024; Views: 144; Downloads: 23
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10. The impact of COVID-19 on the orthopaedic patient in Slovenia : HIP and knee replacement surgery, 90-day mortality, outpatient visits and waiting timesVesna Levašič, Denia Savarin, Simon Kovač, 2022, original scientific article Abstract: Introduction
The purpose of the study was to analyse the impact of the COVID-19 pandemic on the healthcare of the orthopaedic patient, i.e. numbers of hip and knee replacement surgeries, 90-day mortality, waiting times and outpatient clinic visits.
Methods
The Hip (HR) and Knee Replacement (KR) records from The National Arthroplasty Registry of Slovenia in the pandemic year 2020 were compared to the year 2019. To compare reasons for revision and 90-day mortality the Chi-square test was used. The median values of the number of operations and waiting times were compared with the 95% confidence intervals. The number of outpatient clinic visits was tested with the Wilcoxon Signed Ranked test.
Results
All operations fell by 19%, from 7825 to 6335. The number of Primary Total HR declined from 3530 to 2792 (21%) and the number of Primary KR from 3191 to 2423 (24%). The number of hip revisions declined by 10% and knee revisions by 25%. We did not find differences in 90-day mortality (p=0.408). Outpatient clinic visits fell from 228682 to 196582 (14%) per year. Waiting times increased by 15% for HR and by 12% for KR.
Conclusion
There was an inevitable drop in the number of surgeries and outpatient clinic visits in the spring and autumn lockdown. With the reorganisation of the orthopaedic service in Slovenia, the number of KR and HR stayed at a relatively high level despite the pandemic. An epidemiological model and mechanisms for the reduction of waiting times could overcome the impact of the epidemic.
Keywords: COVID-19, hip replacements, knee replacements, 90-day mortality, outpatient clinics, waiting times
Published in DKUM: 26.06.2024; Views: 163; Downloads: 9
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