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1.
6th International Conference on Technologies & Business Models for Circular Economy : conference proceedings
2024, zbornik

Opis: The 6th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering of the University of Maribor in cooperation with Strategic Research and Innovation Partnership – Networks for the transition into circular economy (SRIP – Circular economy), managed by the Chamber of Commerce and Industry of the Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 6th to September 8th, 2023. TBMCE 2023 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included a round table Standardization for circular economy – more secure and less complicated closing of material loops, 6 panel discussions, 1 plenary and 3 keynote lectures, oral and poster presentations. The event was under the patronage of Ministry of the Economy, Tourism and Sport and Ministry of Cohesion and Regional Development. The Netherlands joined us as a partner country.
Ključne besede: sircular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 26.02.2024; Ogledov: 50; Prenosov: 1
.pdf Celotno besedilo (24,07 MB)
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2.
Optimiranje z uporabo matlaba v povezavi z aspen plus simulatorjem
Nejc Arh, 2023, magistrsko delo

Opis: Magistrsko delo se osredotoča na kompleksen problem modeliranja procesnih enot, zlasti reakcijske destilacije. Pri tem uporabljamo že razvite modele v simulatorju Aspen Plus, vendar opozarjamo na omejitve v doseganju optimalnih rešitev. Predpostavili smo, da se s povezavo Aspen Plusa z Matlabom lahko dosežejo boljše optimizacijske rešitve. Cilj naloge je preveriti možnost optimizacije v Matlabu v povezavi z Aspen Plusom ter oceniti prednosti in slabosti različnih tipov optimizacije v Matlabu. Teoretični del vključuje razlago reakcijske destilacije, njenih prednosti in slabosti ter kemijske reakcije v procesu reakcijske destilacije. Poleg tega razpravlja tudi o osnovah optimizacije. Eksperimentalni del vključuje uporabo programa Matlab za optimiranje procesa s poudarkom na uporabi Curve Fitting Toolbox. Prikazuje tudi uporabo programa Aspen Plus za simulacijo procesa ter integracijo obeh programov. Eksperimentalni del je izveden na osnovnem primeru in obširnejšem primeru s simulacijo in optimizacijo procesa reakcijske destilacije. Osnovni primer pokaže, da je za izparevanje potrebno vložiti veliko več toplote, kot za segrevanje vode. Z njim potrdimo tudi uspešno delovanje povezave med programoma Aspen Plus in Matlab. Primer reakcijske destilacije pa predstavi uspešno optimiranje procesa na največji dobiček.
Ključne besede: reakcijska destilacija, Aspen Plus simulacija, Matlab optimizacija, modeliranje procesnih enot, optimizacija procesa destilacije
Objavljeno v DKUM: 11.01.2024; Ogledov: 127; Prenosov: 15
.pdf Celotno besedilo (1,37 MB)

3.
Sinteza trajnostnih in regenerativnih oskrbovalnih mrež na osnovi matematičnega programiranja za postopno doseganje ogljične nevtralnosti : doktorska disertacija
Sanja Potrč, 2023, doktorska disertacija

Opis: Blaženje podnebnih sprememb je eden največjih izzivov sodobne družbe, ki je tesno povezan z vprašanjem energetskega sistema v prihodnosti. Zaradi vse večjega povpraševanja po energiji in s tem povezanega vpliva na okolje in človeštvo je potrebno preoblikovanje energetskega sistema in nadaljnji razvoj v smeri učinkovitejše proizvodnje, dobave in rabe energije. Sedanji ukrepi za doseganje ogljične nevtralnosti in omejitve globalnega segrevanja pod 2 °C glede na predindustrijsko raven so prepočasni in nezadostni, zato bodo za dosego tega cilja potrebna velika prizadevanja na globalni ravni. Proizvodne sisteme je treba sintetizirati v smeri trajnostnega in regenerativnega razvoja, da bodo prilagodljivi na podnebne spremembe in uravnoteženi ter da bodo ohranjali biotsko raznovrstnost za zadovoljitev potreb človeštva v prihodnosti z ohranjanjem celovitosti narave. V doktorski disertaciji prikazujemo razvito metodologijo za celovito sintezo in optimizacijo obsežnih energetskih, (bio)kemijskih in kmetijskih oskrbovalnih mrež za prehod na trajnostni energetski sistem in postopno doseganje ogljične nevtralnosti v Evropski uniji do leta 2050. Hkratno reševanje teh sistemov je možno le z uporabo pristopa matematičnega programiranja, ki zagotavlja tudi dopustnost optimalnih rezultatov za dani niz pogojev. Sinteza takšnih obsežnih oskrbovalnih mrež vsebuje ogromno število zelo kompleksnih interakcij, zato smo pri modeliranju uporabili številne tehnike za zmanjšanje velikosti modela in učinkovite dekompozicijske tehnike. Razvili smo metodologijo za dinamično sintezo oskrbovalnih mrež z biogorivi, električno energijo in toploto iz obnovljivih virov energije ob upoštevanju vseh treh stebrov trajnostnega razvoja – ekonomskega, okoljskega in socialnega. Za povečanje učinkovitosti prihodnjega energetskega sistema in izkoriščanja sinergističnih učinkov povezovanja med sektorji smo matematični model dodelali z medsektorsko integracijo in vključitvijo tako kratkoročnih kot dolgoročnih hranilnikov energije. Doktorska disertacija prikazuje tudi razvoj koncepta regenerativnih oskrbovalnih mrež za postopen prehod na samoobnovitveni (regenerativni) energetski sistem in doseganje letnih negativnih neto emisij oziroma preseganje ogljične nevtralnosti. V ta namen smo razvili napovedovalni model za določanje samoobnovitvene zmožnosti Zemlje glede zajemanja CO2 in koncentracije CO2 v atmosferi. Rezultati optimizacije oskrbovalnih mrež z biogorivi kažejo, da bi z dodatno proizvodnjo biogoriv lahko že do leta 2030 dosegli bistveno večji delež obnovljivih virov energije v prometu, kot je cilj direktive EU, vendar bo za konkurenčnost proizvodnje biogoriv v nekaterih državah ključnega pomena, da bodo podjetja prejela dodatne subvencije. Ugotovili smo tudi, da optimizacija oskrbovalnih mrež na širši, kontinentalni ravni, privede do bistveno boljše trajnostne in ekonomske neto sedanje vrednosti kot v primeru optimizacije na ravni posameznih držav. Rezultati prav tako kažejo, da bo imela medsektorska integracija, predvsem elektrifikacija prometnega in stanovanjskega sektorja ter storitvenih dejavnosti, velik vpliv na izboljšanje učinkovitosti sistema in pospešitev prehoda na trajnostno energetsko prihodnost. Prav tako je pri načrtovanju prihodnjega energetskega sistema pomembno, da ne stremimo le k doseganju ogljične nevtralnosti, temveč k regenerativnemu energetskemu sistemu z negativnimi neto letnimi emisijami, sicer koncentracija CO2 v atmosferi ne bo začela padati, povprečna temperatura pa bo še naprej naraščala. Dobljeni rezultati predstavljajo celoten energetski prehod z izbiro ustreznih tehnologij, lokacij in surovin za doseganje regenerativnega energetskega sistema, ki je sposoben samoobnavljanja. Razvoj novih konceptov in metodologij za sintezo in optimizacijo širših sistemov trajnostnih in regenerativnih oskrbovalnih mrež na osnovi matematičnega programiranja je zelo pomemben za načrtovanje prihodnjega proizvodnega in energetskega sistema.
Ključne besede: matematično programiranje, oskrbovalne mreže, sinteza oskrbovalnih mrež, trajnostni razvoj, regenerativni razvoj, energetski prehod, ogljična nevtralnost
Objavljeno v DKUM: 11.10.2023; Ogledov: 219; Prenosov: 61
.pdf Celotno besedilo (11,23 MB)

4.
6th International Conference on Technologies & Business Models for Circular Economy : book of abstracts
2023

Opis: The 6th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy), managed by the Chamber of Commerce and Industry of Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 6th to September 8th, 2023. The Netherlands joined us as a partner country of the conference. TBMCE 2023 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. Panel discussions addressed following topics: Capture, storage or conversion of CO2 or H2?, The potential of small scale biorefining, Circular economy in construction – myth or real opportunity?, Importance of circular communities in international arena, Sector Coupling: pathways to integrated energy systems, Combating water pollution by plastic waste. The event was
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 01.09.2023; Ogledov: 242; Prenosov: 38
.pdf Celotno besedilo (3,06 MB)
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5.
Amoxicillin doped hyaluronic acid/fucoidan multifunctional coatings for medical grade stainless steel orthopedic implants
Matej Bračič, Sanja Potrč, Matjaž Finšgar, Lidija Gradišnik, Uroš Maver, Hanna Budasheva, Dorota Korte, Mladen Franko, Lidija Fras Zemljič, 2023, izvirni znanstveni članek

Opis: This work investigated the potential of amoxicillin-doped hyaluronic acid/fucoidan multifunctional coatings on medical grade stainless steel as biocompatible, osteointegration enhancing, antimicrobial, and bacterial biofilm inhibiting coatings for orthopedic implants. The coatings were prepared by layer-by-layer spin coating and confirmed by optical contact angle goniometry and infrared spectroscopy. Time-of-flight secondary ion mass spectrometry showed a homogeneous distribution of the individual layers. In contrast, thermal diffusivity, and thermal conductivity measurements by photothermal beam deflection spectrometry showed diffusion of the amoxicillin into the hyaluronic acid and fucoidan layers. In vitro release of amoxicillin showed complete release within one hour, as reflected by the formation of inhibition zones against Staphylococcus aureus and Escherichia coli. Synergistic effects were observed between the hyaluronic acid and amoxicillin in inhibiting S.Aureus biofilm, and between the fucoidan and amoxicillin in improving the antioxidant properties by an ABTS radical scavenging assay. Biocompatibility was determined with human osteoblasts, confirming the potential of such multifunc- tional coatings to enhance the bioactivity of steel-based orthop edic implants.
Ključne besede: orthopedic implant, medical grade stainless steel, amoxicillin, hyaluronic acid, fucoidan, multifunctional coating
Objavljeno v DKUM: 18.08.2023; Ogledov: 323; Prenosov: 56
.pdf Celotno besedilo (10,18 MB)
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6.
Two-layer functional coatings of chitosan particles with embedded catechin and pomegranate extracts for potential active packaging
Sanja Potrč, Tjaša Kraševac Glaser, Alenka Vesel, Nataša Poklar Ulrih, Lidija Fras Zemljič, 2020, izvirni znanstveni članek

Opis: Two-layer functional coatings for polyethylene (PE) and polypropylene (PP) films were developed for the active packaging concept. Prior to coating, the polymer films were activated by O$_2$ and NH$_3$ plasma to increase their surface free energy and to improve the binding capacity and stability of the coatings. The first layer was prepared from a macromolecular chitosan solution, while the second (upper) layer contained chitosan particles with embedded catechin or pomegranate extract. Functionalized films were analyzed physico-chemically to elemental composition using ATR-FTIR spectroscopy and XPS. Further, oxygen permeability and wettability (Contact Angle) were examined. The antimicrobial properties were analyzed by the standard ISO 22196 method, while the antioxidative properties were determined with an ABTS assay. Functionalized films show excellent antioxidative and antimicrobial efficacy. A huge decrease in oxygen permeability was achieved in addition. Moreover, a desorption experiment was also performed, confirming that the migration profile of a compound from the surfaces was in accordance with the required overall migration limit. All these properties indicate the great potential of the developed active films/foils for end-uses in food packaging.
Ključne besede: plazma, citozan, polifenoli, aktivno pakiranje, plasma, chitosan, polyphenols, coating, active package
Objavljeno v DKUM: 12.07.2023; Ogledov: 367; Prenosov: 22
.pdf Celotno besedilo (2,70 MB)
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7.
5th International Conference on Technologies & Business Models for Circular Economy : Conference Proceedings
2023

Opis: The 5th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in cooperation with the Chamber of Commerce and Industry of Štajerska and SRIP- Circular Economy. The conference was held in Portorož, Slovenia, at the Grand Hotel Portorož from September 12th to September 14th, 2022. TBMCE 2022 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included a round table: Asia – factory of the world, what about the EU?, 4 panel discussions, 1 plenary and 4 keynote lectures, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the honorary patronage of Mr. Matjaž Han, Minister of Economic Development and Technology.
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 30.01.2023; Ogledov: 450; Prenosov: 28
.pdf Celotno besedilo (4,86 MB)
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8.
5th International Conference on Technologies & Business Models for Circular Economy, [September 12th to September 14th 2022, Portorož, Slovenia] : Book of Abstracts
2022

Opis: The 5th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy) and Chamber of Commerce and Industry of Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Portorož from September 12th to September 14th, 2022. TBMCE 2022 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the patronage of Ministry of Economic Development and Technology.
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 09.09.2022; Ogledov: 440; Prenosov: 86
.pdf Celotno besedilo (5,09 MB)
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9.
4th International Conference on Technologies & Business Models for Circular Economy, [September 13th to September 15th 2021, Portorož, Slovenia] : conference proceedings
2022

Opis: The 4th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy). The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 13th to September 15th, 2021. TBMCE 2021 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the patronage of Ministry of Economic Development and Technology.
Ključne besede: krožno gospodarstvo, trajnostni razvoj, procesi in tehnologije, krožni poslovni modeli, raziskave in razvoj
Objavljeno v DKUM: 30.05.2022; Ogledov: 731; Prenosov: 62
.pdf Celotno besedilo (2,67 MB)
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10.
3rd International Conference on Technologies & Business Models for Circular Economy, [September 13th to September 15th 2021, Portorož, Slovenia] : conference proceedings
2022

Opis: The 3rd International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy). The conference was held virtually on December 15, 2020. TBMCE 2020 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the patronage of Ministry of Economic Development and Technology.
Ključne besede: krožno gospodarstvo, trajnostni razvoj, procesi in tehnologije, krožni poslovni modeli, raziskave in razvoj
Objavljeno v DKUM: 30.05.2022; Ogledov: 729; Prenosov: 50
.pdf Celotno besedilo (35,67 MB)
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