1. Fractal analysis - a surrogate technique for material characterizationMohanachandran Nair Sindhu Swapna, Sankararaman S, 2017, original scientific article Abstract: Fractal analysis has emerged as a potential analytical tool in almost all branches of science and technology. The paper is the first report of using fractal dimension as a surrogate technique for estimating particle size. A regression equation is set connecting the soot particle size and fractal dimension, after investigating the Field Emission Scanning Electron Microscopic (FESEM) images of carbonaceous soot from five different sources. Since the fractal dimension is an invariant property under the scale transformation, an ordinary photograph of the soot should
also yield the same fractal dimension. This enables one to determine the average size of the soot particles, using the regression equation, by calculating the fractal dimension from the photograph. Hence, instead of frequent measurement of average particle size from FESEM, this technique of estimating the particle size from the fractal dimension of the soot photograph, is found to be a potentially cost-effective and non-contact method. Keywords: fractals, FESEM, carbon nanoparticles, particle size, box-counting Published in RUNG: 30.06.2022; Views: 1109; Downloads: 0 This document has many files! More... |
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5. The finite size effects and two-state paradigm of protein foldingArtem Badasyan, Matjaž Valant, Jože Grdadolnik, Vladimir N. Uversky, 2021, original scientific article Abstract: The coil to globule transition of the polypeptide chain is the physical phenomenon behind the folding of globular proteins. Globular proteins with a single domain usually consist of about 30 to 100 amino acid residues, and this finite size extends the transition interval of the coil-globule phase transition. Based on the pedantic derivation of the two-state model, we introduce the number of amino acid residues of a polypeptide chain as a parameter in the expressions for two cooperativity measures and reveal their physical significance. We conclude that the k2 measure, defined as the ratio of van ’t Hoff and calorimetric enthalpy is related to the degeneracy of the denatured state and describes the number of cooperative units involved in the transition; additionally, it is found that the widely discussed k2=1 is just the necessary condition to classify the protein as the two-state folder. We also find that Ωc, a quantity not limited from above and growing with system size, is simply proportional to the square of the transition interval. This fact allows us to perform the classical size scaling analysis of the coil-globule phase transition. Moreover, these two measures are shown to describe different characteristics of protein folding Keywords: protein folding, two-state model, size scaling, thermodynamic cooperativity Published in RUNG: 24.02.2021; Views: 2043; Downloads: 64 Link to full text This document has many files! More... |
6. Incorporation of Sc into the structure of barium-hexaferrite nanoplatelets and its ex-traordinary finite-size effect on the magnetic propertiesDarko Makovec, Matej Komelj, Goran Dražić, Blaž Belec, Tanja Goršak, Sašo Gyergyek, Darja lisjak, 2019, original scientific article Keywords: Nanoparticles, Magnetic properties, Size effect, Structure properties relationship, Ferrite. Published in RUNG: 06.05.2019; Views: 3119; Downloads: 0 This document has many files! More... |
7. Polymer Nanoparticle Sizes from Dynamic Light Scattering and Size Exclusion Chromatography: The Case Study of Polysilanes.Artem Badasyan, Andraž Mavrič, Irena Kralj Cigić, Tim Bencik, Matjaž Valant, 2018, original scientific article Abstract: Dynamic Light Scattering (DLS) and Size Exclusion Chromatography (SEC) are among the most popular methods for determining polymer sizes in solution. Taking dendritic and network polysilanes as a group of least soluble polymer substances, we critically compare and discuss the difference between nanoparticle sizes, obtained by DLS and SEC. Polymer nanoparticles are typically in poor solution conditions below the theta point and are in globular conformation therefore. Determination of particle sizes in presence of attractive interactions is not a trivial task. The only possibility to measure aggregation-free, a true molecular size of polymer nanoparticles in such regime of solution, is to operate with the dilute solution of globules (below theta point and above the miscibility line). Basing on results of our polysilane measurements, we come to a conclusion that DLS provides more reliable results than SEC for the dilute solution of globules. General implications for the size measurements of polymer nanoparticles in solutions are discussed. Keywords: Polymer Nanoparticle, Dynamic Light Scattering, Size Exclusion Chromatography, Polysilanes Published in RUNG: 16.05.2018; Views: 4201; Downloads: 16 Full text (3,17 MB) |
8. Towards final characterisation and performance of the GCT prototype telescope structure for the Cherenkov Telescope ArrayO. Le Blanc, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: CTA, Gamma-ray Cherenkov Telescope, Small-Size-Telescopes Published in RUNG: 16.02.2018; Views: 2977; Downloads: 146 Full text (697,11 KB) |
9. Test results of a prototype device to calibrate the Large Size Telescope camera proposed for the Cherenkov Telescope ArrayM. Palatiello, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: Large Size Telescope camera, CTA, photon density Published in RUNG: 16.02.2018; Views: 2880; Downloads: 134 Full text (4,39 MB) |
10. A pointing solution for the medium size telescopes for the Cherenkov Telescope ArrayD. Tiziani, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: CTA, medium size telescope, pointing capability Published in RUNG: 16.02.2018; Views: 3348; Downloads: 162 Full text (2,67 MB) |