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10 results on '"Ērglis, Kaspars"'

1. Stability of paramagnetic spheroid in precessing field

Author

Cīmurs, Jānis, Brasovs, Artis, and Ērglis, Kaspars

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Stability analysis of paramagnetic prolate and oblate spheroidal particle in precessing magnetic field is studied. Bifurcation diagram is calculated analytically in dependence of magnetic field frequency and precession angle. The direction of particle in synchronous regime is calculated. Rotational dynamics and mean rotational frequency in asynchronous regime is found. Obtained theoretical model gives possibility to calculate analytically dynamics of the particle in limiting case (when motion is periodic). Theoretically obtained models were compared with experimental results of rod like particle dynamics in precessing magnetic field. Experimental results are in good agreement with proposed theory., Comment: 17 pages, 7 figures

Published
2018
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9. Thermal Fluctuation Effects in Magnetophoresis of Superparamagnetic Microbeads.

Author

Kitenbergs, Guntars, Dzilna, Kristaps, Ērglis, Kaspars, and Cēbers, Andrejs

Subjects
FLUCTUATIONS (Physics), MAGNETIC materials, MICROSTRUCTURE, PARAMAGNETISM, DIFFUSION, PARTICLE image velocimetry, WIENER processes
Abstract

Thermal fluctuation effects in magnetophoresis of commercial superparamagnetic beads are analyzed. By tracking the trajectories of the beads the distribution functions of their displacements in two perpendicular directions are determined. This allows us to determine simultaneously the mean velocity of the beads and their diffusion coefficient. Magnetic moment of a single bead is found by applying the Einstein relation. Distribution of the magnetic moment values are analyzed for two commercial samples of the superparamagnetic beads. [ABSTRACT FROM AUTHOR]

Published
2010
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10. Makroreoloģiskie mērījumi Pf1 vīrusa un magnētisko daļiņu sistēmai ārējā laukā

Author

Rudakovska, Danuta, Ērglis, Kaspars, and Latvijas Universitāte. Fizikas un matemātikas fakultāte

Subjects
viskoelastiskais gēls, maghemīta nanodaļiņas, ārējais magnētiskais lauks, Fizika, ferošķidrumi, Pf1 vīruss
Abstract

Darbā tiek aplūkotas dažādas sistēmas, ko veido bakteriofāga vīruss un ferošķidruma maghemīta nanodaļiņas, mainoties ferošķidruma tilpuma daļai. Galvenā uzmanība tiek pievērsta sistēmas izotropa gēla stāvoklim, kam piemīt viskoelastiskās īpašības, kā arī šķidrā kristāla kūļu fāzei. Izmantojot reometrijas un dinamiskās gaismas izkliedes metodes, šie stāvokļi arī tika izmantoti primārā darba mērķa sasniegšanai: sistēmas reoloģisko parametru noteikšanai ārējā magnētiskajā laukā. Zinot sistēmas un to reoloģisko parametru uzvedību dotajos apstākļos, ir iespējams secināt par to iekšējiem procesiem, kā arī par materiāla, ko veido dotā sistēma, īpašībām. Rezultāti tika salīdzināti ar pieejamiem zinātniskajiem rakstiem par šo tēmu, tika novērtēta šādu zinātnisko pētījumu nozīme un tālākās attīstības perspektīvas., Bacteriophage virus and ferrofluid maghemite particles form the different systems, depending on maghemite particles volume fraction. Viscoelastic isotropic gel phase and liquid crystalline bundling phase are observed. Rheometry and dynamic light scattering methods are used to achieve the main aim of this research: defining rheological parameters of the system in external field. Systems rheological parameters behaviour data ensures the knowledge about its internal processes, and material properties based on it. The results are compared with available scientific articles, the importance of researches in this scientific area and further development outlook are discussed.

Published
2015

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