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  1. No Access

    Article

    Homogeneous nucleation and crystallization model of aluminum droplet based on isothermal DSC analysis

    The aluminum (Al) sample was studied using differential scanning calorimetry (DSC) at non-isothermal and isothermal conditions. The first non-isothermal measurements were performed by melting the Al sample and...

    Zdeněk Kožíšek, Robert Král, Petra Zemenová in Journal of Thermal Analysis and Calorimetry (2022)

  2. No Access

    Article

    Atom Location by Channeling-Enhanced Microanalysis (ALCHEMI) Study of Structure of Complex Concentrated Alloys Derived From FeAl Iron Aluminide

    Two sets of alloys derived from FeAl iron aluminide, with the ratio of Fe and Al equal 55:45 and 50:50, respectively, were investigated. The FeAl alloys were modified by the addition of chromium and vanadium i...

    Petr Kratochvíl, Robert Král, Stanislav Daniš… in Metallurgical and Materials Transactions A (2022)

  3. No Access

    Article

    Calculations of Avrami exponent and applicability of Johnson–Mehl–Avrami model on crystallization in Er:LiY(PO3)4 phosphate glass

    Preparation and thermal properties of Er3+-doped lithium–yttrium meta-phosphate glasses with a nominal composition of Er:LiY(PO3)4 were studied as a new scintillating material for neutron detection. The glassy Er...

    Petra Zemenová, Robert Král… in Journal of Thermal Analysis and Calorimetry (2020)

  4. No Access

    Article

    Fe3Al Iron Aluminides Alloyed with High Concentrations of V and Cr: Their Structure and High Temperature Strength

    Eight iron aluminide alloys with different contents of V and Cr were prepared up to 25 at. pct of both elements. The effect of the V and Cr concentration on the microstructure and mechanical properties was inv...

    Petr Kratochvíl, Stanislav Daniš… in Metallurgical and Materials Transactions A (2018)

  5. No Access

    Article

    The Effect of Nb Addition on the Microstructure and the High-Temperature Strength of Fe3Al Aluminide

    The microstructural and high-temperature mechanical properties of Fe–26Al–xNb (x = 3 and 5 at. pct) are compared. The alloys were investigated “as cast” and after hot rolling at 1473 K (1200 °C). Scanning electro...

    Petr Kratochvíl, Martin Švec, Robert Král… in Metallurgical and Materials Transactions A (2018)

  6. No Access

    Article

    Strengthening of Fe3Al Aluminides by One or Two Solute Elements

    The compressive yield stress of Fe-26Al with additives Ti (0.5 to 4 at. pct), Cr (0.5 to 8 at. pct), Mo (0.5 to 4 at. pct), and V (0.5 to 8 at. pct) at 1073 K (800 °C) has been determined. The effect of the co...

    Petr Kratochvíl, Stanislav Daniš… in Metallurgical and Materials Transactions A (2017)

  7. No Access

    Article

    Characterization and crystallization kinetics of Er-doped Li2O–Y2O3–P2O5 glass studied by non-isothermal DSC analysis

    This work deals with preparation and characterization of Er-doped lithium–yttrium phosphate glass and study of the influence of the particle size in samples on the crystallization process and its kinetics. Two...

    Petra Zemenová, Robert Král, Karel Nitsch… in Journal of Thermal Analysis and Calorimetry (2016)

  8. No Access

    Article

    The Effect of Laves Phase (Fe,Al)2Zr on the High-Temperature Strength of Carbon-Alloyed Fe3Al Aluminide

    The effects of carbon on the phase structure and on the yield stress σ 0.2 in the temperature range from 873 K to 1073 K (600 °C to 800 °C) of the Fe3Al type aluminides alloyed by Zr are a...

    Petr Kratochvíl, Věra Vodičková, Robert Král… in Metallurgical and Materials Transactions A (2016)

  9. No Access

    Article

    Evaluation of Solid-Solution Hardening of Fe-27 at. pct Al by Vanadium and Comparison to Precipitation Strengthening by Vanadium Carbides

    The compressive yield stress of Fe-27Al-xV(-C) (x = 0 to 4 at. pct) at 1073 K (800 °C) has been determined. The increase of the yield stress of Fe-Al by increasing vanadium content is explained by solid-solution ...

    Petr Kratochvíl, Josef Pešička, Robert Král… in Metallurgical and Materials Transactions A (2015)

  10. No Access

    Article

    Investigation of the first and second dehydroxylation of kaolinite

    Raw material kaolin Sedlec Imperial and four types of rehydroxylated samples were used to study the processes of the first and second dehydroxylation of kaolinite by thermal analysis and IR spectroscopy. Activ...

    Petra Zemenová, Alexandra Kloužková… in Journal of Thermal Analysis and Calorimetry (2014)

  11. No Access

    Article

    Phase Structure and High-Temperature Mechanical Properties of Two-Phase Fe-25Al-xZr Alloys Compared to Three-Phase Fe-30Al-xZr Alloys

    The structure and high-temperature mechanical properties of Fe-30 at. pct Al and Fe-25 at. pct Al alloys with various Zr contents are compared. The scanning electron microscope images in chemical contrast mode...

    Pavel Kejzlar, Petr Kratochvíl, Robert Král… in Metallurgical and Materials Transactions A (2014)

  12. No Access

    Chapter and Conference Paper

    Word Sense Discrimination for Czech

    This paper deals with the automatic discrimination of contexts of Czech ambiguous words. The Schütze’s methodology was used, modified and transformed for the Czech language. This algorithm is based on vector s...

    Robert Král in Text, Speech and Dialogue (2002)

  13. No Access

    Chapter and Conference Paper

    Three Approaches to Word Sense Disambiguation for Czech

    Before building a full wsd system it is necessary to have a balanced and representative corpus annotated with sense tags. This requirement is not certainly fulfilled for the Czech language. Thus, we decided to...

    Robert Král in Text, Speech and Dialogue (2001)

  14. No Access

    Article

    Two new species of Rhynchospora section Psilocarya (Cyperaceae)

    Two new species ofRhynchospora sectionPsilocarya are described and illustrated.Rhynchospora eburnea is known from Amazonian Venezuela and nearby Brazil whileRhynchospora waspamensis is known only from eastern Zel...

    Robert Kral, Wm. Wayt Thomas in Brittonia (1988)

  15. No Access

    Article

    Two new species of Rhynchospora (Cyperaceae) from Mexico

    Two new species ofRhynchospora from Mexico are described and illustrated. The white-bractedR. oaxacana is clearly a member of subsectionLongibracteatae which is otherwise found only in South America. A key to all...

    Robert Kral, Wm. Wayt Thomas in Brittonia (1986)

  16. No Access

    Article

    A new phyllodial-leaved Sagittaria (Alismaceae) from Alabama

    A new species,Sagittaria secundifolia, is described from Alabama and is compared to the other species of its taxonomic complex.

    Robert Kral in Brittonia (1982)

  17. No Access

    Article

    Book Reviews

    Larry L. Tieszen, Lytton J. Musselman, Richard Evans Schultes… in Economic Botany (1980)

  18. No Access

    Article

    The tree key. A guide to identification in garden, field, and forest

    Robert Kral in Economic Botany (1980)

  19. No Access

    Article

    Book reviews

    C. Earle Smith, W. Hardy Eshbaugh, Robert Kral, Lytton J. Musselman… in Economic Botany (1980)

  20. No Access

    Article

    A new arenaria (Caryophyllaceae) from the cumberlands of Tennessee

    Arenaria cumberlandensis, a new species from the Cumberland Plateau, is described and illustrated. Its relationship toA. groenlandica is discussed.

    B. Eugene Wofford, Robert Kral in Brittonia (1979)

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