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ROBOMINERS - Developing a bio-inspired modular robot-miner for difficult to access mineral deposits
Luís Lopes, Balázs Bodó, Claudio Rossi, Stephen Henley, Gorazd Žibret, Alicja Kot-Niewiadomska, Vitor Correia, 2020

Povzetek: Within the ROBOMINERS project an innovative technology for the future exploitation of small and difficult to access mineral deposits is being studied. The project has two main objectives. First, the development of a bioinspired reconfigurable robotic miner prototype, able to navigate, explore and mine selectively with a certain degree of autonomy. The robot-miner will be able to work under different conditions, making the exploitation of many mineral deposits economically feasible, while reducing social and environmental impacts associated with conventional mining methods. The second objective is the creation of a vision of a new mining ecosystem, its function, parts, research roadmaps and visions for years 2030 and 2050, including creation of novel ideas from other sectors, particularly robotics. The robotic ecosystem concept will be tested in representative sites across Europe with simulations, showcasing the different mining environments and conditions where it can be applied.
Ključne besede: avtonomni robot, rudniki, prospekcija, mineralne surovine
DiRROS - Objavljeno: 06.01.2021; Ogledov: 960; Prenosov: 370
.pdf Celotno besedilo (2,56 MB)

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UNEXUP: robot-based exploration technology for underground flooded mines
Norbert Zajzon, Balázs Bodó, Luís Lopes, Gorazd Žibret, Márcio Tameirão Pinto, 2020

Povzetek: UNEXUP is a direct continuation of the UNEXMIN project. In UNEXMIN efforts were made towards the design, development and testing of a robotic exploration technology for underground flooded mines, with navigational and geoscientific instruments. In UNEXUP the main goal is to raise commercial interest and improve the system's hardware, software and capabilities. The UX-1 NEO, to be developed and tested in 2020, will address the limitations detected during UNEXMIN field missions, and will meet the needs and requirements from mining companies, geological surveys and other potential customers. In addition, a new robot will be built and added to the system, to be ready in 2021, which will open further mineral exploration possibilities.
DiRROS - Objavljeno: 07.01.2021; Ogledov: 924; Prenosov: 424
.pdf Celotno besedilo (1,68 MB)

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Distribution of Pb, Zn and Cd in stream and alluvial sediments in the area with past Zn smelting operations
Barbara Čeplak, Gorazd Žibret, 2021

Povzetek: The sources of Zn, Pb and Cd in alluvial and stream sediments have been studied in the area of historical Zn smelting tradition. 30 samples of stream sediments and samples from 4 alluvial sediment profiles were collected. Fractions 0.125–0.063 and < 0.063 mm were analysed by the means of ICP-MS prior 4-acid digestion. The highest levels of Zn, Cd and Pb were detected in the alluvial sediments in the closest vicinity to the abandoned slag and ore roasting residue waste dumps, reaching 96 and 4520 mg/kg, 522 and 26,800 mg/kg and 3.7 and 31 mg/kg for Pb, Zn and Cd in stream and alluvial sediments, respectively. The Voglajna River then transports contamination particles into the Savinja River, which afterwards flows into the Sava River. Consequently, the anomaly can even be detected in the Sava River, more than 30 km downstream. Higher levels of Pb, Zn and Cd have been found in fraction < 0.063 mm compared to 0.125–0.063 mm fraction. Impacts of historically contaminated soil erosion and in particular the wash-out of Zn-smelting waste from the improperly managed waste dump were recognised as the dominant sources of Zn, Cd and Pb in the stream and alluvial sediments.
Ključne besede: onesnaženje okolja, rečni sedimenti, porazdelitev elementov, topilništvo
DiRROS - Objavljeno: 03.03.2022; Ogledov: 141; Prenosov: 49
.pdf Celotno besedilo (1,76 MB)

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The valorisation of selected quarry and mine waste for sustainable cement production within the concept of circular economy
Ildikó Merta, Sabina Kramar, Monika Fidanchevska, Bojan Poletanovic, Klemen Teran, Gorazd Žibret, Ljiljana Kljajević, Maruša Mrak, Katarina Šter, Emilija Fidanchevski, 2022

Povzetek: The cement industry could potentially consume large amounts of solid industrial waste in order to improve its sustainability. The suitability of selected quarry and mine waste as secondary raw materials (SRM) was examined for the sustainable production of cement following the concept of a circular economy. The chemical, mineralogical, and radiological characterization of SRM was conducted in this study. Its potential use in low-carbon and low-energy belite-sulfoaluminate cement was investigated by incorporating the examined SRM into cement clinker. Various characterization methods were used to characterize the cement, including X-ray powder diffraction (XRD), thermal analysis (DTA/TG), and isothermal calorimetry. Depending on the chemical composition of the waste, lower or higher amounts were allowed to be incorporated into the raw clinker mixture for a targeted clinker phase composition. Among the samples, differences were observed in the phase composition of synthesized clinkers, which slightly influenced the reactivity of the cement but did not significantly change the compressive strength of the final product.
Ključne besede: BCSA clinker, cement, circular economy, clinker, mine wastes, quarry waste
DiRROS - Objavljeno: 10.06.2022; Ogledov: 62; Prenosov: 46
.pdf Celotno besedilo (3,34 MB)

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Building of the Al-Containing secondary raw materials registry for the production of low CO2 mineral binders in South-Eastern European region
Sabina Kramar, Katarina Šter, Lea Žibret, Klemen Teran, Gorazd Žibret, 2021

Povzetek: The bottleneck in the process for increasing production of low CO2 mineral binders, based on BCSA (belite sulfoaluminate) clinkers, is the availability of Al-rich raw materials. For that purpose, a new registry of Al-containing secondary mineral residues (industrial and mine waste) has been developed and is presented in this paper. The methodology of creating the registry consists of three main steps: Gathering ideas, consolidation of ideas, and implementation. In order to achieve this, the following methodology was adopted: Analysis of similar registries by potential end-users and seeking potential solutions and tools to be used, and conducting 3 rounds of stakeholder consultations via workshops in order to determine crucial parameters and features the registry needs to contain. The key discussion points were about which data the registry needs to contain, who shall be the potential users, and what are the stakeholderʼs expectations from the registryʼs portal. Potential individual registry variables were identified as being relevant/irrelevant or available/unavailable, and potential solutions for the registrys sustainability were explored. Each Al-rich waste/residue data entry is divided into 10 slots, describing legal status, location, quantities, chemical (REE included), mineralogical, physical and radiological properties, life-cycle assessment, additional data, and data relevancy. The registry will act as a matchmaking tool between producers/holders of Al-rich secondary raw materials and potential producers of cement clinkers.
Ključne besede: cement, belite sulfoaluminate clinker, waste, by--product, deležniki, open access
DiRROS - Objavljeno: 10.06.2022; Ogledov: 73; Prenosov: 60
.pdf Celotno besedilo (2,23 MB)

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Impact of urbanization and steel mill emissions on elemental composition of street dust and corresponding particle characterization
Mattia Fanetti, Gorazd Žibret, Klemen Teran, 2022

Povzetek: Street Dust (SD) acts as a sink and source of atmospheric particles containing Potentially Toxic Elements (PTEs) and can pose a possible pathway of PTEs to human bodies. Comprehensive SD study, where 249 samples were collected from rural, urban and industrialized areas aimed to increase the understanding between sedimentation of atmospheric dust derived from anthropogenic activities and elemental composition of SD. Elemental composition for 53 elements (ICP-MS, aqua regia digestion) was determined on fraction <0.063 mm. Significantly increased levels of Sn-Cu-Sb-Bi-Ag-Ba-Mo-Pt-Pb and other elements have been detected in urban environments, compared to the rural ones. SEM/EDS investigation identified that main carriers of Ba, Cu and Sn are most likely particles derived from non-exhaust traffic emissions. Areas around steel mills show a strong enrichment with Cr, Mo, Ni and W, which exponentially decreases with the increased distance from the plant, reaching corresponding urban background 15 and 20 km from the source. SEM/EDS inspection identified spherical and melted irregular particles as the main carriers of the above-mentioned elements. City managers shall adapt measures to reduce amount of vehicular traffic and quantity of deposited SD on the public surfaces and encourage green city planning, while industrial emitters are encouraged to reduce their dust emissions.
Ključne besede: ironwork, pollution, potentially toxic elements, Slovenia, traffic
DiRROS - Objavljeno: 10.06.2022; Ogledov: 80; Prenosov: 25
.pdf Celotno besedilo (10,32 MB)

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Fluid therapy: double-edged sword during critical care?
Mitja Lainščak, Gorazd Voga, Jan Benes, Mikhail Kirov, Vsevolod Kuzkov, Zsolt Molnar, Xavier Monnet, 2015

Povzetek: Fluid therapy is still the mainstay of acute care in patients with shock or cardiovascular compromise. However, our understanding of the critically ill pathophysiology has evolved significantly in recent years.The revelation of the glycocalyx layer and subsequent research has redefined the basics of fluids behavior in the circulation. Using less invasive hemodynamic monitoring tools enables us to assess the cardiovascular function in a dynamic perspective. This allows pinpointing even distinct changes induced by treatment, by postural changes, or by interorgan interactions in real time and enables individualized patient management. Regarding fluids as drugs of any other kind led to the need for precise indication, way of administration, and also assessment of side effects.We possess now the evidence that patient centered outcomes may be altered when incorrect time, dose, or type of fluids are administered. In this review, three major features of fluid therapy are discussed: the prediction of fluid responsiveness, potential harms induced by overzealous fluid administration, and finally the problem of protocol-led treatments and their timing.
DiRROS - Objavljeno: 21.03.2018; Ogledov: 2959; Prenosov: 721
URL Celotno besedilo (0,00 KB)

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The clinical relevance of oliguria in the critically ill patient : analysis of a large observational database
Jean Louis Vincent, Andrew Ferguson, Peter Pickkers, Stephan M. Jakob, Ulrich Jaschinski, Ghaleb A. Almekhlafi, Marc Leone, Majid Mokhtari, Luis E. Fontes, Philippe R. Bauer, Yasser Sakr, 2020

Povzetek: Background: Urine output is widely used as one of the criteria for the diagnosis and staging of acute renal failure, but few studies have specifically assessed the role of oliguria as a marker of acute renal failure or outcomes in general intensive care unit (ICU) patients. Using a large multinational database, we therefore evaluated the occurrence of oliguria (defined as a urine output < 0.5 ml/kg/h) in acutely ill patients and its association with the need for renal replacement therapy (RRT) and outcome. Methods: International observational study. All adult (> 16 years) patients in the ICON audit who had a urine output measurement on the day of admission were included. To investigate the association between oliguria and mortality, we used a multilevel analysis. Results: Of the 8292 patients included, 2050 (24.7%) were oliguric during the first 24 h of admission. Patients with oliguria on admission who had at least one additional 24-h urine output recorded during their ICU stay (n = 1349) were divided into three groups: transient-oliguria resolved within 48 h after the admission day (n = 390 [28.9%]), prolonged-oliguria resolved > 48 h after the admission day (n = 141 [10.5%]), and permanent-oliguria persisting for the whole ICU stay or again present at the end of the ICU stay (n = 818 [60.6%]). ICU and hospital mortality rates were higher in patients with oliguria than in those without, except for patients with transient oliguria who had significantly lower mortality rates than non-oliguric patients. In multilevel analysis, the need for RRT was associated with a significantly higher risk of death (OR = 1.51 [95% CI 1.19%1.91], p = 0.001), but the presence of oliguria on admission was not (OR = 1.14 [95% CI 0.97%1.34], p = 0.103). Conclusions: Oliguria is common in ICU patients and may have a relatively benign nature if only transient. The duration of oliguria and need for RRT are associated with worse outcome.
Ključne besede: critical care, critical illness, urine, oliguria, kidney, renal insufficiency, kidney diseases, acute kidney failure, mortality, urine output, renal replacement therapy
DiRROS - Objavljeno: 18.11.2020; Ogledov: 825; Prenosov: 505
.pdf Celotno besedilo (727,74 KB)

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