Претрага
33 items
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Actual contamination of the Danube and Sava rivers at Belgrade (2013)
Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening... 1170 ANTONIJEVIĆ et al. comparison of target and non-target analyses pointed to potential misinter- pretation of the real state of pollution. Keywords: river systems; state of pollution; organic pollutants; heavy metals; screening analyses; non-target screening. INTRODUCTION Large rivers are severely ...
... for freshwater organisms. Lastly, a brief ecotoxicity screening performed with V. fischeri showed none of the river water samples had a toxic effect on this kind of bacteria. Non-target screening analyses of river water Non-target screening analyses based on GC/MS techniques were applied to all ...
... complementary analytical approaches were employed covering both i) organic contaminants in the river water by target analyses of hormones and neonicotinoids as well as non-target screening analyses and ii) heavy metals in the sediments. Finally, some common water quality parameters were analysed. ...Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer. "Actual contamination of the Danube and Sava rivers at Belgrade (2013)" in Journal of the Serbian Chemical Society, National Library of Serbia (2014). https://doi.org/10.2298/JSC131105014A
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Regional Scale Screening of Groundwater Pollution Risk Induced by Regional Scale Screening of Groundwater Pollution Risk Induced by Historical Mining Activities in Serbia
Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Ninković Sunčica, Magazinović Sava (2015)Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Ninković Sunčica, Magazinović Sava. "Regional Scale Screening of Groundwater Pollution Risk Induced by Regional Scale Screening of Groundwater Pollution Risk Induced by Historical Mining Activities in Serbia" in Groundwater Vulenrability from Scientific concept to practical application, Ustron, Poland, 25-29 May 2015, Sosnowiec, Poland:Faculty of Earth Sciences, University of Silesia, Sosnowiec, Poland (2015): 9-9
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Risk-based Regional Scale Screening of Groundwater Contamination from Abandoned Mining Sites in Serbia - Initial Results
Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Stojković Jana, Gardijan Sunčica. "Risk-based Regional Scale Screening of Groundwater Contamination from Abandoned Mining Sites in Serbia - Initial Results" in IMWA 2016 – Mining Meets Water – Conflicts and Solutions, 11. - 15. Jul, 2016, Leipzig, Germany (2016): 600-607
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Regional-scale screening of groundwater pollution risk induced by historical mining activities in Serbia
Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Gardijan Sunčica, Magazinović Sava (2016)Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Gardijan Sunčica, Magazinović Sava. "Regional-scale screening of groundwater pollution risk induced by historical mining activities in Serbia" in Environmental Earth Sciences no. 75, :Springer Berlin Heidelberg (2016): 1152. https://doi.org/10.1007/s12665-016-5983-9
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Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking
Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović. "Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking" in X International Scientific Congress Innovations 2024, Varna, Bulgaria, 24-27. jun 2024, Scientific Technical Union of Mechanical Engineering "Industry 4.0" (2024)
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Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals
Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić. "Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals" in Review on advanced materials science, Walter de Gruyter GmbH (2020). https://doi.org/10.1515/rams-2020-0043
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Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study
Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...... in the range of 4000 cm ! to 660 cm ! with a resolution of 0.5 cm !. 3. Results and discussion 3.1. Preliminary study 3.1.1. Lyoprotectant screening Several factors can affect the redispersibility of freeze-dried nano- crystals. To prevent aggregation of nanoparticles during freeze-drying, ...
... The type and concentration of these excipients have been shown to have a strong influence on redispersibility (Jakubowska et al., 2022), so screening of lyoprotectants was the first step of the preliminary study. The formu- lation of interest in this research is intended for parenteral administra- ...
... stability of such formulations depends on the excipients that contribute to their tonicity (Wang, 2015). Therefore, based on the observations in the screening phase, three samples were selected for the stability study: S 10%, S+M 1 + 1 10%, and S+M 3 + 2 10%. 3.1.2. Determination of the glass transition ...Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić. "Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study" in European Journal of Pharmaceutical Sciences, Elsevier BV (2023). https://doi.org/10.1016/j.ejps.2023.106557
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Снимање подземних инсталација GPR (Ground penetrating Radar) системом
Невена Ђурђев (2024)Циљ овог мастер рада на тему ,,Снимање подземних инстлација GPR (Ground penetrating radar) системом” је био да се прецизно идентификују положаји подземних инсталација и прикључака, због сумње да су поједине инсталације постављене изван пројектованих позиција.Георадарски систем одабран је за детектовање и идентификовање подземних инсталација, због своје способности да обезбеди неинвазивно и детаљно снимање подземних структура.Првобитно је примењена GNSS метода снимања коришћењем GPS-а, потом услед немогућности отварања шахти, одлучено је да се примени георадарска у комбинацији са електромагнетном методом. Након ...катастар, катастар водова, подземне инсталације, методе детекције подземних инсталација, георадарска метода, георадар... eeopaoap Screening Eagle G58000 PRO 82 Ta6eza 5.1. cremdQakanuja reopanapa Screening Eagle GS8000 PRO [26]. Instrument Tech Specs Radar technology Stepped-frequency Continuous-Wave GPR Modulated frequency range 40 – 3440 MHz Effective bandwidth 3200 MHz Min. detectable target size 1 cm|0 ...
... JUČTCKIIHJy MCTAJHHX ICBH. /lereknuuja je BpnteHa care/rehHM HHCTpyMCHTHMa: 1. Teopanmap Screening Eagle, wonen: GS8000 PRO. 2. EnekTpoMarHeTHu moKaTop Vivax-Metrotech, Mojnen: vLoc3-DM. Teopanap Screening Eagle GS8000 PRO je HarnpejiHuH reopajlapcKH CHCTeM JIH3ajHHpaH 3a TIipeniH3HO CHHMaMbC ...
... BH3yajnmnanmuja y 2D H 3D. • MHrerpHcaHu alarH 3a (puzrrpapame H o0pa/ny nojaTaka. • Ilonmpmka a payanmuure Bpcre ITIP orpeMe H agreHa [19]. 6. Screening Eagle Proceq, jecre riporpaM ripHMeMhbeH 3a o0pajny mojaTaka y OBOM paany H Hy cneJtehe kapakTepHcTHKe: • Busyamsaanuja y peajIHOM BpeMcHy. ...Невена Ђурђев. Снимање подземних инсталација GPR (Ground penetrating Radar) системом, 2024
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Fuzzy Model for Risk Assessment of Machinery Failures
The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...... the risk indicators. The engineering system (the crushing machine) was divided into eight subsystems: the hydraulic, engine, electrical, crushing, screening, transport, construction, and feeder subsystems. For each crushing machine subsystem, the indicators were analyzed and the level of risk was assessed ...
... Mill rotor 2 795, 2686 24, 40 Table 7. Machine hours recorded between two instances of failure and downtime due to failures in the subsystem “screening”. Subsystem Failure of Element Number of Failures Time to Failure (h) Time to Repair (h) S cr e e n in g Rubber shock absorber 3 891, 906, ...
... 15046 0.19357 0.25574 0.23666 0.16357 Electrical system 0.14681 0.16750 0.26026 0.26988 0.16230 Crushing 0.15046 0.19357 0.25574 0.23666 0.16357 Screening 0.14622 0.20042 0.30672 0.20042 0.14622 Transport 0.14622 0.20042 0.30672 0.20042 0.14622 Construction 0.15314 0.24440 0.26656 0.19779 0.13811 Feeder ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy Model for Risk Assessment of Machinery Failures" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12040525
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Анализа могућности примене метода повећања степена искоришћења на нафтном лежишту "Ј"
Иван Савић (2024)Комплексно лежиште „Ј“ је сачињено од колектор стена различите стратиграфске припадности и хетерогеног литолошког састава. Лежиште се налази у последњој фази разраде, а током животног века експлоатисано је само примарним методама. У раду је приказана анализа стања разраде лежишта, а као основни фактори који су допринели ниском степену искоришћења лежишта издвојени су вискозност нафте, хетерогеност колектора и пад лежишног притиска. Изведена је хидродинамичка симулациона студија помоћу које је издвојена најпогоднија зона за пилотну примену терцијарних метода. Коришћењем „скрининг“ критеријума ...... Novel Enhanced-Oil-Recovery Screening i Approach Based on Bayesian Clustering and Principal-Component Analysis”, SPE Reservoir Evaluation&Engineering, 2016 11. Taber, J.J., Martin, F.D., Seright, R.S., “EOR screening criteria revisited - part l: introduction to screening criteria and enhanced recovery ...Иван Савић. Анализа могућности примене метода повећања степена искоришћења на нафтном лежишту "Ј", 2024
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Split-Desktop software for the analysis of fragment size distribution of blasted rock mass
Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović. "Split-Desktop software for the analysis of fragment size distribution of blasted rock mass" in 9th International Conference Mining and environmental protection, Sokobanja, Serbia, 24 – 27. May 2023, Belgrade : University of Belgrade, Faculty of Mining and Geology (2023)
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Application of Thermal Imaging in Surface Mining
Milanka Negovanović (2022)Termalno snimanje se sve više koristi u rudarskoj industriji kao jedan od dijagnostičkih alata za praćenje određenih proizvodnih procesa, kao i stanja opreme i mašina. Predstavlja nedestruktivnu i beskontaktnu metodu ispitivanja koja omogućava rano otkrivanje problema, planiranje održavanja sa minimalnim kvarovima, sprečavanje neplaniranih poremećaja, posmatranje materijala u nepristupačnim ili opasnim područjima i poboljšanje bezbednosti i produktivnosti. Termalno snimanje koristi specijalizovane termalne kamere sa unutrašnjim detektorima koji identifikuju veoma male temperaturne varijacije i proizvode sliku tog nevidljivog infracrvenog ili toplotnog ...Termalno snimanje, nedestruktivne metode testiranja, površinska eksploatacija, termalne kamere, rudarske operacijeMilanka Negovanović. "Application of Thermal Imaging in Surface Mining" in 15th International Conference OMC 2022, Zlatibor, 12-15th October 2022, Jugoslovenski komitet za površinsku eksploataciju (2022)
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Pre-failure deformation monitoring as rockfall prediction tool
... also detect reflectivity of the target point, as potentially valuable information in rock slope analysis (surface rock type, weathering degree water content might be correlated). These angular and distance measurements allow accurate reconstruction of each target point spatial coordinates (X,Y,Z) ...
... early spring, on a cloudy but not rainy day, to provide constant light/reflectivity conditions between scanning epochs and to avoid vegetation screening. • R,G,B values are not to be sequentially collected, as they may differ significantly between adjacent scans and time epochs due to change of ...
... 3. Data processing Acquisition protocol was followed by a processing protocol which comprised of: • Data processing in Leica Cyclone software (target and surface matching registration, surface matching georeferencing relative to zero epoch, segmentation and cloud cleaning, unifying to 3cm spatial ...Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić. "Pre-failure deformation monitoring as rockfall prediction tool" in IOP Conference Series: Earth and Environmental Science, IOP Publishing (2021). https://doi.org/10.1088/1755-1315/833/1/012197
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Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils
Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii... to Timperio et al. [37], MALDI-TOF analysis showed a high similarity with 16S rDNA analyses, suggesting the applicability for low-cost and rapid screening of bacteria from extreme environments. Since the MALDI-TOF identification is well-matched with a large range of culture media and conditions and also ...
... assessing the quality of olive cake pellets. Fuel Process. Technol. 2013, 116, 250–256. [CrossRef] 20. Shukla, A.; Cameotra, S.S. A new method for the screening of ureolytic bacteria inducing calcium carbonate precipitation. J. Biotechnol. Biomater. 2016, 6, 248–251. [CrossRef] 21. Mitchell, A.C.; Ferris ...
... sigmoidal mathematical model was used. The CaCO3 precipitation is dependent on the saturation state, as well as the CaCO3 growth mechanism [23]. A non-affinity-based first-order rate law could be applied to describe the data adequately. Briefly, an assumption was made that 1 mol CaCO3 was formed after ...Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov. "Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils" in Microorganisms, MDPI AG (2021). https://doi.org/10.3390/microorganisms9081691
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NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands
Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić. "NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands" in Inorganica Chimica Acta, Elsevier BV (2012). https://doi.org/10.1016/j.ica.2012.09.016
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Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization
Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić . "Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization" in Mineral and Thermal Waters of Southeastern Europe, Springer International Publishing (2016). https://doi.org/10.1007/978-3-319-25379-4
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Long-term planning methodology for improving wood biomass utilization
The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković. "Long-term planning methodology for improving wood biomass utilization" in Energy, Elsevier BV (2019). https://doi.org/10.1016/j.energy.2019.03.105
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Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications
Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалимаDarko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic. "Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications" in Science of Sintering, Bor, August 2024, National Library of Serbia (2024). https://doi.org/10.2298/SOS240701029B
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Анализа примене утискивања полимера за повећање искоришћења лежишта „Х“
Јана Ивановић (2024)Лежиште „Х“ се налази у Панонском басену и део је нафтно-гасног поља „ХХ“.С обзиром на висок удео воде у произведеном флуиду на лежишту је потребно применити неку методу којом би се смањила брзина напредовања фронта воде ка производним бушотинама, односно смањио удео воде у производњи. Овај рад има за циљ да детаљно испита могућност примене једне од допунских метода повећања искоришћења лежишта, методе утискивања полимера на изабраном лежишту „Х“. Први део рада приказује основне теоријске појмове на којима се ...... Laila, Wei Mingzen, Bai Baojun, „Data Analysis and Updated Screening Criteria for Polymer Flooding Based on Oilfield Data”, SPE&Reservoir Evaluation&Engineering, 2014. [7] Delamaide Eric, „Polymer Flooding of Heavy Oil - From Screening to Full- Field Extension”, 2014. [8] Dongmei Wang, Huanzhong ...Јана Ивановић. Анализа примене утискивања полимера за повећање искоришћења лежишта „Х“, 2024
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Low-temperature phase transition and magnetic properties of K3YbSi2O7
Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica... the twinning itself lead to significant problems when refining atomic displacement parameters in highly absorbing compounds due to the so-called screening effect (Petřı́ček et al., 2016). However, even in the hexagonal �-structure the refinement of the displacement parameters of the oxygen atoms ...
... the twinning itself lead to significant problems when refining atomic displacement parameters in highly absorbing compounds due to the so-called screening effect (Petfi¢ek ef al., 2016). However, even in the hexagonal f-structure the refinement of the displacement parameters of the oxygen atoms was not ...
... polyhedra forming the so- called octahedral layer (Figs. 1 and 2). The coordination polyhedron about the potassium cations K1+ can be described as a non-distorted hexagonal pyramid with a triple vertex, or as a truncated hexagonal pyramid with a regular hexagonal base upon which a parallel triangular ...Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović. "Low-temperature phase transition and magnetic properties of K3YbSi2O7" in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr) (2021). https://doi.org/10.1107/S2052520621006077