1. 26. dnevi varstvoslovja, Zreče, 4. in 5. junij 2025 : zbornik povzetkov2025, proceedings Abstract: Prispevki 26. konference Dnevi varstvoslovja prinašajo strokovni in znanstveni premislek o načinih in virih za zagotavljanje varnosti sodobne družbe. V zborniku so zbrani napovedniki treh okroglih miz in petinštirideset povzetkov, v katerih se avtorji lotevajo tematik s področja policijske dejavnosti, kriminologije, kriminalistike, informacijske varnosti, pravosodja, penologije, vojaške dejavnosti, splošnega varstvoslovja in drugih tematik, ki jih narekujejo varnostni izzivi sodobne družbe.
Keywords: varstvoslovje, varnost, policijska dejavnost, kriminologija, kriminalistika, informacijska varnost, penologija
Published in DKUM: 02.06.2025; Views: 0; Downloads: 1
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2. Determinants of diarrhea, phenotypic and genomic characterization of Escherichia coli isolates from diarrheic and non-diarrheic patients attending public primary health facilities in Addis Ababa and Hossana, Ethiopia : dissertationWolde Deneke, 2025, doctoral dissertation Keywords: dissertations, Escherichia coli, antimicrobial resistance, genetic diversity, antimicrobial resistance genes, virulence-associated genes, mobile genetic elements, phylogenetic groups, whole-genome sequencing
Published in DKUM: 10.04.2025; Views: 0; Downloads: 16
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3. Digitalna transformacija v logistiki in managementu oskrbovalnih verig2025 Abstract: Visokošolski učbenik "Digitalna transformacija v logistiki in managementu oskrbovalnih verig" je celovit vodnik, namenjen podpiranju digitalizacije in digitalnih pristopov v logistiki. Poudarek je na digitalizaciji procesov, uporabi orodij za za digitalno obdelavo podatkov in simulacije ter na avtonomnih vozilih ter strojnem učenju v logističnih procesih in kibernetski varnosti. Interdisciplinarni pristop združuje znanja iz več področij - računalništva, informatike, mehatronike, strojnega učenja in simulacijskih postopkov ter poslovnega odločanja, kar omogoča celovito razumevanje izzivov digitalne logistike in aplikacijo uporabnih znanj tudi na področja izven logistike in oskrbovalnih verig. Bralci so opremljeni s praktičnimi znanji in veščinami za izboljšanje učinkovitosti, preglednosti posameznih procesov. Učbenik pokriva teme, kot so: 1) Digitalizacija procesov - načrtovanje; 2) Digitalizacija procesov - izvedba; 3) Poslovno-informacijski sistemi; 4) Simulacije in digitalni dvojčki; 5) Avtonomna vozila v logistiki in 6) Informacijska varnost. Celotna vsebina je usmerjena v krepitev digitalnih kompetenc, ki so ključne za uspešno upravljanje sodobnih logističnih podjetij in odpornih oskrbovalnih verig.
Keywords: avtonomna vozila, digitalizacija procesov, interdisciplinarna znanja, digitalna logistika, zeleni in digitalni prehod, informacijska varnost
Published in DKUM: 09.04.2025; Views: 0; Downloads: 21
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4. Significant fragmentation of disposable surgical masks—enormous source for problematic micro/nanoplastics pollution in the environmentAlen Erjavec, Olivija Plohl, Lidija Fras Zemljič, Julija Volmajer Valh, 2022, original scientific article Abstract: The pandemic of COVID-19 disease has brought many challenges in the field of personal
protective equipment. The amount of disposable surgical masks (DSMs) consumed increased dramatically, and much of it was improperly disposed of, i.e., it entered the environment. For this reason,
it is crucial to accurately analyze the waste and identify all the hazards it poses. Therefore, in the
present work, a DSM was disassembled, and gravimetric analysis of representative DSM waste was
performed, along with detailed infrared spectroscopy of the individual parts and in-depth analysis
of the waste. Due to the potential water contamination by micro/nanoplastics and also by other
harmful components of DSMs generated during the leaching and photodegradation process, the
xenon test and toxicity characteristic leaching procedure were used to analyze and evaluate the
leaching of micro/nanoplastics. Micro/nanoplastic particles were leached from all five components
of the mask in an aqueous medium. Exposed to natural conditions, a DSM loses up to 30% of its mass
in just 1 month, while micro/nanoplastic particles are formed by the process of photodegradation.
Improperly treated DSMs pose a potential hazardous risk to the environment due to the release of
micro/nanoparticles and chloride ion content.
Keywords: DSM, micro/nanoparticles, leaching, artificial weathering, environmental pollution
Published in DKUM: 26.03.2025; Views: 0; Downloads: 1
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5. Public handling of protective masks from use to disposal and recycling options to new productsKatarina Remic, Alen Erjavec, Julija Volmajer Valh, Sonja Šterman, 2022, original scientific article Abstract: A study was conducted on the waste of disposable surgical masks and their problematic impact on the environment. The studies examined have shown the negative effects on the environment that are likely to occur and those that have already occurred. In this article, society's relationship to the potential recycling of disposable surgical masks is considered and projected onto the possibilities of the cradle-to-cradle design approach. The development of a product from recycled surgical masks is driven by two different surveys. The first focuses on wear and disposal habits, and the second on the relationship to recycling. As a result, the flooring was developed with thermally treated recycled surgical masks replacing the filler layer. The goal of the product design was to improve the long-term life cycle analysis of a waste surgical mask.
Keywords: maske, medicinski odpadki, okolje, recikliranje izdelka z dodano vrednostjo, analiza življenjskega cikla, masks, medical waste, recycling added-value product, life-cycle-analysis
Published in DKUM: 26.03.2025; Views: 0; Downloads: 1
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6. Economical chemical recycling of complex PET waste in the form of active packaging materialJulija Volmajer Valh, Dimitrije Stopar, Ignacio Selaya Berodia, Alen Erjavec, Olivera Šauperl, Lidija Fras Zemljič, 2022, original scientific article Abstract: Since millions of tons of packaging material cannot be recycled in conventional ways, most
of it ends up in landfills or even dumped into the natural environment. The researched methods
of chemical depolymerization therefore open a new perspective for the recycling of various PET
materials, which are especially important for packaging. Food preservative packaging materials
made from PET plastics are complex, and their wastes are often contaminated, so there are no
sophisticated solutions for them in the recycling industry. After integrating the biopolymer chitosan,
which is derived from natural chitin, as an active surface additive in PET materials, we discovered
that it not only enriches the packaging material as a microbial inhibitor to reduce the bacteria
Staphylococcus aureus and Escherichia coli, thus extending the shelf life of the contained food, but also
enables economical chemical recycling by alkaline or neutral hydrolysis, which is an environmentally
friendly process. Alkaline hydrolysis at a high temperature and pressure completely depolymerizes
chitosan-coated PET packaging materials into pure terephthalic acid and charcoal. The products
were characterized by Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance
spectroscopy, and elemental analysis. The resulting reusable material represents raw materials
in chemical, plastic, textile, and other industries, in addition to the antimicrobial function and
recyclability itself.
Keywords: chitosan, active packaging, PET, recycling, reusability
Published in DKUM: 26.03.2025; Views: 0; Downloads: 5
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7. Harnessing environmental yeasts - Pichia kudriavzevii strain ZMUM_K002 : the quest for isolates with properties for efficient biotechnological applicationsTadeja Vajdič, Marjanca Starčič Erjavec, 2025, original scientific article Abstract: The environment hosts a diversity of microorganisms whose potential for biotechnological applications has not yet been exhausted. The quest of our study was to find isolates of Pichia kudriavzevii from the environment that could be used as new biotechnological agents. Moreover, we aimed to explore the resource efficiency for microbial cultivation, in particular the efficiency of spent coffee grounds (SCG), an easily accessible waste coffee product with a high unutilized organic content. In this study, Pichia kudriavzevii strain ZMUM_K002, a yeast strain isolated from a grape pomace compost, was investigated. Antifungal susceptibility, particularly fluconazole susceptibility, was assessed, and the strain’s biotechnological potential by comparing its ability to utilize low-cost carbon sources, including SCG, with a natural isolate of Saccharomyces cerevisiae (strain ZMUM_K003) was assessed. The P. kudriavzevii strain ZMUM_K002 exhibited higher fluconazole susceptibility and yielded more than 30% more biomass in optimized media formulations compared to S. cerevisiae ZMUM_K003. These findings demonstrate that P. kudriavzevii ZMUM_K002 has the potential for efficient biomass production in sustainable industrial biotechnology, particularly in processes requiring high biomass yields on alternative substrates.
Keywords: Pichia kudriavzevii, Candida krusei, environmental sampling, biomass production, sauerkraut, safety assessment, spent coffee grounds
Published in DKUM: 21.03.2025; Views: 0; Downloads: 6
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8. Morphological, surface and thermal properties of polylactic acid foils, melamine-etherified resin, and polyethylene terephthalate fabric during (bio)degradation in soilOlivija Plohl, Alen Erjavec, Lidija Fras Zemljič, Alenka Vesel, Maja Čolnik, Mojca Škerget, Yee Van Fan, Lidija Čuček, Gregor Trimmel, Julija Volmajer Valh, 2023, original scientific article Keywords: plastic materials, (bio)degradation, soil, surface chemistry, thermal properties, surface zeta potential
Published in DKUM: 28.02.2025; Views: 0; Downloads: 6
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9. Burnout and job satisfaction of healthcare workers in Slovenian nursing homes in rural areas during the COVID-19 pandemicLjiljana Leskovic, Karmen Erjavec, Robert Leskovar, Goran Vukovič, 2020, original scientific article Abstract: Introduction and objective: Since there is no study on burnout and job satisfaction in Slovenian nursing homes during the COVID-19 pandemic, this study aims to analyse job satisfaction and burnout levels of healthcare professionals working in Slovenian nursing homes in rural areas during the COVID-19 pandemic, and make a comparison with the results of the same services in 2013.
Material and methods: The study is based on a cross-organisational and descriptive quantitative study conducted in spring 2013 (n = 556) and spring 2020 at the peak of the pandemic in Eastern Europe (n = 781) to identify the relationships and the changes in the satisfaction and burnout levels of healthcare professionals working in Slovenian nursing homes in rural areas, and on a qualitative study conducted in 2020, to identify in-depth relationships and changes in both studies during the COVID-19 pandemic.
Results: An increase in burnout syndromes between 2013 – 2020 was observed. The respondents experienced intensified emotional exhaustion and lack of personal accomplishment during the COVID-19 pandemic; however, depersonalisation did not differ statistically over the years. During the pandemic crisis, healthcare workers were less satisfied with their job than in spring 2013. Their job satisfaction was related to satisfaction with the work of nursing homes and with the work of state institutions and politicians who directly affected their working conditions and recognition in society.
Conclusions: The COVID-19 pandemic significantly exacerbated already existing burnout syndromes of nursing homes healthcare workers in Slovenian rural areas. Job satisfaction proved to be a relevant predictor of burnout syndrome. A negative correlation was observed between job satisfaction in 2020 and emotional exhaustion and personal accomplishment in 2013 and 2020.
Keywords: job satisfaction, professional burnout, healthcare workers, nursing homes, COVID-19 pandemic
Published in DKUM: 28.01.2025; Views: 0; Downloads: 7
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10. Predelava odpadnih zaščitnih kirurških mask v nov funkcionalen polimerni material : doktorska disertacijaAlen Erjavec, 2024, doctoral dissertation Abstract: Proizvodnja osebne varovalne opreme (OVO) v zadnjih letih izredno hitro narašča. K tej rasti je zagotovo prispevala pandemija bolezni COVID-19, ki pa ni edini razlog za izredno hitro rast tega sektorja. Po podatkih številnih analitičnih hiš bo trg OVO do leta 2028 imel več kot 60 % rast v primerjavi z letom 2020. Z večanjem proizvodnje OVO, pa se večajo tudi količine tega tipa odpadka in s tem pritisk na prevzemnike odpadkov. Glede na to, da gre pri zaščitnih kirurških maskah (ZKM), za enega najbolj razširjenih kosov OVO, ki ima izredno kratek čas uporabe in je njegova življenjska pot izredno linearno naravnana, so v tej doktorski disertaciji bili analizirani vplivi tega kosa OVO na okolje in predstavljene možnosti recikliranja tega materiala v večvrednostne materiale. Opravljena je bila raziskava rokovanja Slovencev z ZKM v kateri je bilo ugotovljeno, da je v prvem letu pandemije v Sloveniji bilo uporabljenih več kot 344 milijonov kosov ZKM. Prav tako je bila opravljena ocena odpadka in ocena vpliva ZKM na okolje, kadar so te nepravilno odložene. Dokazano je bilo, da so materiali zastopani v ZKM izredno primerni za postopke mehanskega recikliranja. Z namenom zagotavljanja večvrednosti končnega reciklata, so reciklatu ZKM bila dodana naravna polnila. Izbrana so bila polnila na osnovi celuloze in hitozana, saj gre za najbolj razširjena naravna polimera. Med polnili na osnovi celuloze so bili uporabljeni celulozni nanokristali, celulozne nanofibrile in kvaternizirane celulozne nanofibrile, med tem ko sta med hitozani bila uporabljena hitozan z nizko molekulsko maso in kvaterniziran hitozan. Večina polnil, je izkazala pozitiven vpliv na mehanske lastnosti reciklata, saj so nekatera povečala elastičnost reciklata tudi do 100%. Izvedene so bile številne analize površine. Te analize so med drugim pokazale, da prisotnost vseh polnil izkazuje dvig hidrofobnosti materiala, obe kvaternizirani polnili, pa v prisotnosti več kot 10 % izkazujeta tudi zelo dobro antibakterijsko delovanje reciklata, na gram + bakterije Staphylococcus aureus.
Keywords: zaščitne kirurške maske, mehansko recikliranje, večvrednostno recikliranje, naravna polnila, polimerni kompozit
Published in DKUM: 29.11.2024; Views: 0; Downloads: 67
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