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Collection's Items (Sorted by Submit Date in Descending order): 21 to 40 of 178
Battiato, Marco , Minár, Jan , Wang, Weimin , Ndiaye, W. , Richter, M. C. , Heckmann, Olivier , Mariot, Jean Michel , Parmigiani, Fulvio , Hricovíni, Karol , Cacho, Cephise M.
Distinctive picosecond spin polarization dynamics in bulk half metals

Femtosecond laser excitations in half-metal (HM) compounds are theoretically predicted to induce an exotic picosecond spin dynamics. Femtosecond spin dynamics experiments performed on Fe 3 O 4 by time- and spin-resolved photoelectron spectroscopy support our model. Furthermore, the spin polarization&#...

Nemšák, Slavomír , Gehlmann, Mathias , Kuo, Cheng Tai , Lin, Shih Chieh , Schlueter, Christoph , Młyńczak, Ewa , Lee, Tienlin , Pluciński, Łukasz , Ebert, Hubert , Di Marco, Igor , Minár, Jan , Schneider, Claus Michael , Fadley, Charles S.
Element-and momentum-resolved electronic structure of the dilute magnetic semiconductor manganese doped gallium arsenide

The dilute magnetic semiconductors have promise in spin-based electronics applications due to their potential for ferromagnetic order at room temperature, and various unique switching and spin-dependent conductivity properties. However, the precise mechanism by which the transition-metal doping produces fe...

Xu, Junqing , Zhang, Peng , Haule, Kristjan , Minár, Jan , Wimmer, Sebastian , Ebert, Hubert , Cohen, Ronald E.
Thermal Conductivity and Electrical Resistivity of Solid Iron at Earth’s Core Conditions from First Principles

We compute the thermal conductivity and electrical resistivity of solid hcp Fe to pressures and temperatures of Earth’s core. We obtain thermal and electrical conductivities that are consistent with experiments considering reasonable error. The predicted thermal conductivity is reduced from previ...

Dakhel, A. A. , Bououdina, Mohamed , Jaafar, Adnan , Khan, Wilayat , Azam, Sikander A. , Minár, Jan , Kanoun, Mohammed Benali , Goumri-Said, Souraya
Effect of (Cd, Al) Co-doping and hydrogenation on the long-range ferromagnetic ordering of ZnO: Experimental and DFT studies

The nanopowders of ZnO coded Al and Cd were synthesized by thermal decomposition and were characterized by XRD. The measured optical properties point to a band gap of 3.23-3.12eV. By the hydrogenation of ZnO, we were able to stabilize the magnifying phase as confirmed by ...

Braun, Jürgen , Minár, Jan , Ebert, Hubert
Correlation, temperature and disorder: Recent developments in the one-step description of angle-resolved photoemission

Various apparative developments extended the potential of angle-resolved photoemission spectroscopy tremendously during the last two decades. The following article reviews the corresponding recent theoretical developments in the field of angle-resolved photoemission with a special emphasis on correlation effects,...

Krempaský, j. , Muff, Stefan , Minár, Jan , Pilet, Nicolas , Fanciulli, Mauro , Weber, Andrew P. , Guedes, Eduardo B. , Caputo, Marco , Müller, Elisabeth , Volobuev, Valentine V. , Gmitra, Martin , Vaz, Carlosaf A.F. , Scagnoli, Valerio , Springholz, Gunther , Dil, Jan Hugo
Operando Imaging of All-Electric Spin Texture Manipulation in Ferroelectric and Multiferroic Rashba Semiconductors

The control of the electron spin by external means is a key issue for spintronic devices. Using spin- and angle-resolved photoemission spectroscopy (SARPES) with three-dimensional spin detection, we demonstrate operando electrostatic spin manipulation in ferroelectric α-GeTe and multiferroic Ge1−xMnxTe.&#x...

Nicolai, Laurent Christophe , Minár, Jan
XPS limit in soft X-ray photoemission spectroscopy of Ag(001)

PhotoEmission Spectroscopy (PES) is a surface sensitive technique within the Ultra-Violet regime. A way to make it more bulk sensitive consists in increasing the photon energy for entering the X-ray regime. As a counterpart, this increase breaks the k-conserving dipole selection rule an...

Podaný, Pavel , Reardon, Christopher , Koukolíková, Martina , Procházka, Radek , Franc, Aleš
Microstructure, Mechanical Properties and Welding of Low Carbon, Medium Manganese TWIP/TRIP Steel

Manganese twinning induced plasticity (TWIP) steels are attractive materials for the automotive industry thanks to their combination of strength and excellent toughness. This article deals with basic microstructural and mechanical properties of sheet metal of two heats of low-carbon medium-manganese&#...

Calta, Pavel , Šutta, Pavol , Medlín, Rostislav , Netrvalová, Marie
Impact of sublayer thickness and annealing on silicon nanostructures formation in alpha-Si:1-1/alpha-SiNx:H superlattices for photovoltaics

Formation of silicon nanostructures embedded in silicon nitride layers can be of great interest for micro and optoelectronic devices such as non-volatile memories and solar cells. In this work, we synthesized amorphous multilayered a-Si:H/a-SiNx:H superlattice structures with different thickness ...

Dilawary, Shaikh Asad Ali , Motallebzadeh, Amir , Houdková Šimůnková, Šárka , Medlín, Rostislav , Haviar, Stanislav , Lukáč, František , Afzal, Muhammad Naveed , Çïmenoǧlu,, Hüseyin
Modification of M2 hardfacing: Effect of molybdenum alloying and laser surface melting on microstructure and wear performance

The influence of alloying (10 wt% Molybdenum) and post deposition treatment (Laser Surface Melting) on the structural characteristics and wear performance of Plasma Transfer Arc deposited M2 hardfacings have been investigated. The nature of matrix and carbides of M2 hardfacing had changed&#x...

Chmelař, Josef , Bělský, Petr , Mrázek, Jiří , Švadlák, Daniel , Hermannová, Martina , Šlouf, Miroslav , Krakovský, Ivan , Šmejkalová, Daniela , Velebný, Vladimír
Nanostruktura acylovaných derivátů hyaluronanu v pevném stavu

Acyl derivatives of hyaluronan (acyl-HA) are promising materials for biomedical applications. Depending on the acyl length and the degree of substitution, these derivatives range from self-assembling watersoluble polymers to materials insoluble in aqueous environments. The behaviour of acyl-HA was stu...

Irfan, Muhammad , Azam, Sikander , Hussain, Safdar , Khan, Saleem Ayaz , Sohail, M. , Ahmad, Manzoor , Goumri-Said, Souraya
Vylepšené termoelektrické vlastnosti ASbO3 v důsledku snížené odstupu pásma prostřednictvím modifikovaného potenciálního schématu beckeho johnsona

Using density functional theory (DFT) calculations, we have explored the effect of Ag and Cs atoms on the electronic transport properties of ASbO3 (A = K, Ag and Cs). We employed first principle calculations for investigation of electronic, optical and thermoelectric properties of ...

Irfan, Muhammad , Abbas, Zeesham , Khan, Saleem Ayaz , Sohail, Mohammad , Rani, Malika , Azam, Sikander A. , Kityk, Iwan V.
Účinky stlačeného materiálu na termoelektrické vlastnosti Cu3SbSe4

Recently Cu3SbSe4 have attracted enhanced an interest due to abundant potential for extensive thermoelectric applications. To get a complete prediction of its thermoelectric performance and charge transport details it is important to have fundamental data concerning band structure. In the present...

Vobecká, Lucie , Svoboda, Miloš , Beneš, Jan , Belloň, Tomáš , Slouka, Zdeněk
Heterogenita heterogenních iontově výměnných membrán zkoumaná pomocí chronopotenciometrie a rentgenové mikrotomografie

Chronopotentiometry is a powerful experimental technique for characterization of ion-exchange membranes, especially phenomena associated with ion transport and the occurrence of overlimiting current. One also uses this technique to estimate heterogeneity of ion-exchange membranes, or more precisely the fra...

Palán, Jan , Šutta, Pavol , Kubina, Tomáš , Domanková, Mária
Účinek výrazné plastické a chladné deformace na strukturní a mechanické vlastnosti čistého komerčního titanu.

SPD (severe plastic deformation) processing of materials provides a great potential associated with the enhancement of their properties by refining the initial grain structure. The present experiments involved mechanical working of commercial-purity titanium (Ti Grade 2) with the CONFORM SPD tech...

Houdková, Šárka , Česánek, Zdeněk , Smazalová, Eva , Lukáč, František
Vysokoteplotní odolnost proti opotřebení a oxidaci HVOF povlaků na bázi CrC

Three commercially available chromium carbide-based powders with different kinds of matrix (Cr3C2-25%NiCr; Cr3C2-25%CoNiCrAlY and Cr3C2-50%NiCrMoNb) were deposited by an HVOF JP-5000 spraying gun, evaluated and compared. The influence of heat treatment on the microstructure and properties, as well as ...

Vrána, Jiří , Charvát, Jiří , Mazúr, Petr , Bělský, Petr , Dundálek, Jan , Pocedič, Jaromír , Kosek, Juraj
Komerční membrány pro vanadové průtočné baterie: vliv iontově-výměnné kapacity a vnitřní struktury membrány

A series of perfluorosulfonic membranes is screened for application in vanadium redox flow batteries (VRFB): membranes of constant thickness 50 μm with different ion-exchange capacities ranging from 0.56 to 1.15 mol eq. g−1 . Diffusion flux of each vanadium ion occurring in VRFB el...

Mazúr, Petr , Mrlík, J. , Beneš, Jan , Pocedič, Jaromír , Vrána, Jiří , Dundálek, Jan , Kosek, Juraj
Vyhodnocení výkonnosti tepelně upravených grafitových plstěných elektrod pro vanadovou redoxní průtočnou baterii a jejich čtyřbodová charakterizace v monočlánku

In our contribution we study the electrocatalytic effect of oxygen functionalization of thermally treated graphite felt on kinetics of electrode reactions of vanadium redox flow battery. Chemical and morphological changes of the felts are analysed by standard physico-chemical characterization techniqu...

Matikainen, Ville , Koivuluoto, Heli , Vuoristo, P. , Schubert, Jan , Houdková Šimůnková, Šárka
Vliv geometrie trysky na mikrostrukturu a vlastnosti HVOF a HVOF sptříkaných povlaků WC-10Co4Cr a Cr3C2-25NiCr

Thermally sprayed hard metal coatings are the industrial standard solution for numerous demanding applications to improve wear resistance. In the aim of improving coating quality by utilising finer particle size distributions, several approaches have been studied to control the spray temperature....

Šesták, Jaroslav , Fiala, Jaroslav , Gavrichev, Konstantin S.
Hodnocení odborné hodnoty vědeckých prací, jejich reagující citace a publikační autorita

For the most part, the “publish or perish” paradigm has inevitable implications on the quality of research published because the scientific results are evaluated by quantity and not by quality. The pressure for multiple publication results in creation of so-called predators journals act...

Collection's Items (Sorted by Submit Date in Descending order): 21 to 40 of 178