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RISS 인기검색어
- 검색키워드
- 저자 : Ledwig, Micheal (검색결과 6 건)
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Semileptonic hyperon decays in the self-consistent SU(3) chiral quark-soliton model
Ledwig, Tim,Silva, Antonio,Kim, Hyun-Chul,Goeke, Klaus IOP Publishing Ltd 2008 Journal of high energy physics Vol.2008 No.7
We investigate the semileptonic hyperon decays within the framework of the self-consistent SU(3) chiral quark-soliton model (χQSM). We take linear 1/<I>N</I><SUB><I>c</I></SUB> rotational as well as linear <I>m</I><SUB><I>s</I></SUB> corrections into account and apply the symmetry conserving quantization. We present the results for the form factors <I>f</I><SUB>1</SUB>(<I>Q</I><SUP>2</SUP>), <I>f</I><SUB>2</SUB>(<I>Q</I><SUP>2</SUP>) and <I>g</I><SUB>1</SUB>(<I>Q</I><SUP>2</SUP>) in addition to the semileptonic decay constants of hyperons. We also have calculated the radii and dipole masses of these form factors for all relevant strangeness-conserving and strangeness-changing transitions.
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Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings
P. Ledwig,T. Ratajski,P. Indyka,I. Kalemba‑Rec,A. Kopia,M. Kąc,B. Dubiel 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6
In this study, nc-TiO2/Ni–Fe composite coatings, and Ni–Fe alloys as equivalents to their matrices, were obtained from citratesulphatebaths in the electrodeposition process using direct current and pulse current conditions. The aim of the study was toexamine the effects of TiO2nanoparticles and current conditions on the chemical composition, surface morphology, microstructure,microhardness and magnetic properties of the electrodeposited coatings. The results show that the concentrationof Fe in Ni–Fe alloys is related to the current conditions and is higher in the case of pulse current electrodeposition, whilesuch a relationship was not observed for composites. The reinforcement of composites with TiO2nanoparticles results in amore developed surface topography with many nodule-like structures. Composites and equivalent alloys deposited in pulsecurrent are characterized by a finer grain size than those obtained in direct current. TiO2nanoparticles and their agglomerates,several tens of nanometres in size, are distributed randomly in the Ni–Fe matrix of composites deposited in both currentconditions used. Incorporation of a high volume fraction of nc-TiO2, exceeding over a dozen percent, and decreasing thenanograin size in nc-TiO2/Ni–Fe composites electrodeposited under pulse current conditions, allow a higher hardness to beachieved than in their counterparts obtained using direct current. Magnetic measurements showed ferromagnetic orderingof pristine TiO2nanoparticles, however, the introduction of TiO2nanoparticles into the Ni–Fe matrix resulted in a decreasein coercivity and saturation magnetization.
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Magnetic Particle Spectrometry of Fe<sub>3</sub>O<sub>4</sub> Multi-Granule Nanoclusters
Pan, Lijun,Park, Bum Chul,Ledwig, Micheal,Abelmann, Leon,Kim, Young Keun IEEE 2017 IEEE transactions on magnetics Vol.53 No.11
<P>Magnetic particle imaging (MPI) is a novel high-resolution medical imaging method that does not use ionizing radiation, but safe iron oxide nanoparticles as contrast agents. By employing magnetite (Fe3O4) multi-granule nanoclusters (MGNCs), one has two control parameters: the diameter of the particles and that of granules in single particles. Here we investigate the effect of the size of the particles at constant granule size, as well as the effect of granule size at constant particle size on the magnetization reversal. The saturation magnetization Ms value increases with increasing granule diameter and particle diameter, while the coercivity Hc value reaches a maximum at a particle size of about 60 nm. MGNCs with an average particle size of 77 nm and granule diameter of 17 nm show a larger response in the higher harmonics compared to the commercial reference, FeraSpin R dispersion, at both 20 and 30 mT. This result demonstrates that the MGNC concept allows tailoring of the magnetic properties of the particles to the imaging conditions in MPI.</P>
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