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1.
Sustainable design of circular reinforced concrete column sections via multi-objective optimization
Primož Jelušič, Tomaž Žula, 2023, izvirni znanstveni članek

Opis: An optimization model for reinforced concrete circular columns based on the Eurocodes is presented. With the developed optimization model, which takes into account the exact distribution of the steel reinforcement, which is not the case when designing with conventional column design charts, an optimal design for the reinforced concrete cross section is determined. The optimization model uses discrete variables, which makes the results more suitable for actual construction practice and fully exploits the structural capacity of the structure. A parametric study of the applied axial load and bending moment was performed for material cost and CO2 emissions. The results based on a single objective function show that the optimal design of the reinforced concrete column cross section obtained for the material cost objective function contains a larger cross-sectional area of concrete and a smaller area of steel compared with the optimization results when CO2 emissions are determined as the objective function. However, the optimal solution in the case where the material cost was assigned as the objective function has much more reserve in axial load capacity than in the optimal design where CO2 was chosen as the objective function. In addition, the multi-objective optimization was performed to find a set of solutions that provide the best trade-offs between the material cost and CO2 emission objectives.
Ključne besede: reinforced concrete columns, circular cross section, costs, CO2 emissions, multi-objective optimization, genetic algorithm
Objavljeno v DKUM: 15.04.2024; Ogledov: 54; Prenosov: 4
.pdf Celotno besedilo (4,56 MB)
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2.
Transitioning towards Net-Zero Emissions in Chemical and Process Industries : A Holistic Perspective
Peter Glavič, Zorka Novak-Pintarič, Helena Levičnik, Vesna Dragojlović, Miloš Bogataj, 2023, pregledni znanstveni članek

Opis: Given the urgency to combat climate change and ensure environmental sustainability, this review examines the transition to net-zero emissions in chemical and process industries. It addresses the core areas of carbon emissions reduction, efficient energy use, and sustainable practices. What is new, however, is that it focuses on cutting-edge technologies such as biomass utilization, biotechnology applications, and waste management strategies that are key drivers of this transition. In particular, the study addresses the unique challenges faced by industries such as cement manufacturing and highlights the need for innovative solutions to effectively reduce their carbon footprint. In particular, the role of hydrogen as a clean fuel is at the heart of revolutionizing the chemical and process sectors, pointing the way to cleaner and greener operations. In addition, the manuscript explores the immense importance of the European Green Deal and the Sustainable Development Goals (SDGs) for the chemical industry. These initiatives provide a clear roadmap and framework for advancing sustainability, driving innovation, and reducing the industry's environmental impact, and are a notable contribution to the existing body of knowledge. Ultimately, alignment with the European Green Deal and the SDGs can bring numerous benefits to the chemical industry, increasing its competitiveness, promoting societal well-being, and supporting cross-sector collaboration to achieve shared sustainability goals. By highlighting the novelty of integrating cutting-edge technologies, addressing unique industrial challenges, and positioning global initiatives, this report offers valuable insights to guide the chemical and process industries on their transformative path to a sustainable future.
Ključne besede: net zero, energy, process industries, emissions, climate, chemicals, biomass, waste, cement, metals
Objavljeno v DKUM: 19.02.2024; Ogledov: 164; Prenosov: 6
.pdf Celotno besedilo (894,06 KB)
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3.
Suggestions and solutions for enhancing active commuting to the University of Maribor and advancing ▫$CO_2$▫ emission reduction
Beno Mesarec, Branka Trček, 2024, izvirni znanstveni članek

Opis: This study investigated commuting behavior at four technical faculties (BCTF) in Maribor. The main aim was to provide suggestions and solutions for challenges related to active commuting to the BCTF, while promoting advancements in CO2 emission reduction. The research methodology was based on analyses of a questionnaire survey and calculations of CO2 emissions. The results indicate that implementing measures to promote walking, bicycling and the use of city and regional public transport, in conjunction with supportive housing and parking policies, has the potential to eliminate car trips within 0–1 km of the BCTF and reduce car trips from other zones in favor of active commuting by 30% to 50%. These proposed transport scenarios could lead to an annual reduction in CO2 emissions ranging from 17% to 29%. The greatest potential for CO2 savings is observed within 0–5 km of the BCTF, where a shift to walking and bicycling could reduce emissions by up to 44%. The results also highlighted a notable disparity, indicating that students with term-time accommodations emitted 3.5 times and 4.1 times less annual CO2 within 0–5 km of the BCTF compared to students and staff commuting daily from their permanent residences in the city.
Ključne besede: university, travel behavior, modal choice, active mobility, CO2 emissions
Objavljeno v DKUM: 30.01.2024; Ogledov: 194; Prenosov: 15
.pdf Celotno besedilo (557,88 KB)
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4.
Suggestions and solutions for enhancing active commuting to the University of Maribor and advancing ▫$CO_2$▫ emission reduction
Beno Mesarec, Branka Trček, 2024, izvirni znanstveni članek

Opis: This study investigated commuting behavior at four technical faculties (BCTF) in Maribor. The main aim was to provide suggestions and solutions for challenges related to active commuting to the BCTF, while promoting advancements in CO2 emission reduction. The research methodology was based on analyses of a questionnaire survey and calculations of CO2 emissions. The results indicate that implementing measures to promote walking, bicycling and the use of city and regional public transport, in conjunction with supportive housing and parking policies, has the potential to eliminate car trips within 0–1 km of the BCTF and reduce car trips from other zones in favor of active commuting by 30% to 50%. These proposed transport scenarios could lead to an annual reduction in CO2 emissions ranging from 17% to 29%. The greatest potential for CO2 savings is observed within 0–5 km of the BCTF, where a shift to walking and bicycling could reduce emissions by up to 44%. The results also highlighted a notable disparity, indicating that students with term-time accommodations emitted 3.5 times and 4.1 times less annual CO2 within 0–5 km of the BCTF compared to students and staff commuting daily from their permanent residences in the city.
Ključne besede: university, travel behavior, modal choice, active mobility, CO2 emissions
Objavljeno v DKUM: 30.01.2024; Ogledov: 121; Prenosov: 0

5.
Challenges in the EMC standardization of wireless power transfer systems
Bernd Jaekel, 2019, strokovni članek

Opis: Charging of electrical and electronic equipment is currently mostly done via conducted connection to an AC/DC power supply unit. However, trends in technology, also driven by issues of convenience for the user, are moving towards wireless power transfer (WPT). A wireless process, in which most of the power is just used for the transfer of energy, includes the usage of a frequency for the power transfer, hence needing resources in the frequency spectrum. As the frequency spectrum is more or less completely assigned to the usage of radio or other services, such as industrial, scientific or medical (ISM) applications, it turns out to be a relatively complex task to actually decide on which frequencies can be used for WPT technology. This paper describes the challenges in the determination of such frequencies in terms of standardization and presents the related consequences.
Ključne besede: electromagnetic emissions, EMC, radiated emissions, wireless power transfer, inductive power transfer
Objavljeno v DKUM: 05.12.2023; Ogledov: 264; Prenosov: 4
.pdf Celotno besedilo (594,68 KB)
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6.
Energy Efficiency Indicators of a Single Unit House
Iztok Brinovar, Gregor Srpčič, Zdravko Praunseis, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, objavljeni znanstveni prispevek na konferenci

Opis: This article deals with the evaluation of energy efficiency indicators of an older single unit house with the use of "KI energija 2017" software, which is widely used among qualified Slovenian experts authorized to carry out the energy performance assessments and issue an energy performance certificate. The energy performance analysis before and after the implementation of proposed measures has shown significant energy saving potential in renovation of existing buildings.
Ključne besede: energy efficiency, energy indicators, energy performance, building renovation, CO2 emissions
Objavljeno v DKUM: 04.12.2023; Ogledov: 349; Prenosov: 14
.pdf Celotno besedilo (18,06 MB)
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7.
Improving decentralized economic growth and reducing energy consumption in the European Union with the application of ecologically oriented innovations
Niko Natek, Boštjan Krajnc, 2020, strokovni članek

Opis: This article presents applicable approaches for supporting the transition towards sustainable decentralized economic development within the European Union, based on the concept of supporting the development and market uptake of eco-innovations. The main topic addressed is achieving a more effective market uptake of ecologically oriented innovations facilitated through matchmaking, as well as knowledge and technology transfer between key actors of the innovation process.
Ključne besede: Energy efficiency, Ecology, Innovation, Economy, waste-water treatment, constructed wetlands, green-house gas emissions, EU
Objavljeno v DKUM: 15.11.2023; Ogledov: 250; Prenosov: 4
.pdf Celotno besedilo (803,56 KB)
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8.
Impacts of zero-emission powertrains based on hydrogen technologies in public transport
Niko Natek, Boštjan Krajnc, 2020, izvirni znanstveni članek

Opis: This article reviews the development potentials and environmental impact of introducing category M3 vehicles (for passenger transport/buses) with fuel cell electric powertrains to an urban and inter-urban public transport service (PTS) to be operated in the Savinjsko-Šaleška region. The main focus is the demonstration of the PTS modelling and preliminary environmental impact assessment of the operation compared to conventional (modern) diesel-powered internal combustion engines.
Ključne besede: Hydrogen, Fuel Cell, Transport, Energy efficiency, Green-house gas emissions, Energy transition, Environment, Public transport service, Internal combustion Engine, CO2
Objavljeno v DKUM: 15.11.2023; Ogledov: 294; Prenosov: 4
.pdf Celotno besedilo (1,66 MB)
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9.
A company’s carbon footprint and sustainable development
Jure Gramc, Rok Stropnik, Mitja Mori, 2022, izvirni znanstveni članek

Opis: Climate changes are already here. And they will get much worse in time. The main reason for global warming is GHG emissions from anthropological sources. That includes transportation, industry, electricity production, agriculture, and others. The European Union has introduced a new Green Deal as an answer to climate change. The European Green Deal puts more pressure on companies to mitigate their carbon footprint and implement sustainable development. One of the basic steps in the analysis of the environmental profile of a company is the identification of hot spots by using the carbon footprint methodology. The workflow of the carbon footprint calculation follows GHG Protocol standardised methodology. The calculation was made for a medium-sized company in the plastics industry. For all GHG emission sources, hot spots were identified and analysed. Based on the hot spots, sensitivity analysis for different pre-defined scenarios has been made, which are aligned with the company’s mid- and long-term sustainability goals. The three main hot spots of the company within scopes 1 and 2 are purchased heat, purchased electricity, and combustion of fuels in company vehicles. GHG emissions of heat and electricity are dependent on their distributor and their electricity and heat sources. The hot spot of scope 3 is purchased goods, especially plastic granulate. In the study, we focus only on scope 1 and scope 2.
Ključne besede: carbon footprint, sustainable development, environmental impacts, GHG Protocol, greenhouse gas emissions, global warming, sensitivity analysis
Objavljeno v DKUM: 30.10.2023; Ogledov: 353; Prenosov: 9
.pdf Celotno besedilo (2,06 MB)
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10.
Estimation of real driving emissions based on data from OBD
Matej Fike, Andrej Predin, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: vehicle, diesel engine, exhaust emission levels, real driving emissions
Objavljeno v DKUM: 30.10.2023; Ogledov: 272; Prenosov: 5
.pdf Celotno besedilo (14,78 MB)
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