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Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 71
Al-Jaary, Ali H. Reshak , Parasyuk, Oleg V. , Kamarudin, Hussin , Kityk, Ivan V. , Alahmed, Zeyad A. , Alzayed, Nasser Saleh , Auluck, Sushil , Fedorchuk, Anatolii O. , Chyský, J.
Experimentální a teoretické studie elektronické struktury a optické spektrální charakteristiky PbIn6Te10

We present measurements of the optical properties of crystalline PbIn6Te10. The samples are grown in the form of parallelepipeds of size _5 _ 3 _ 0.3 mm3. The absorption coefficient a(hn) shows an exponential behavior with energy in the energy range 0.82–0.99 eV followed by&#x...

Rendlová, Zdeňka
The dynamic behavior of the fast rotating system in dependence on operating parameters of bearing supports

Typical components of many industrial devices are rotating parts. In case of automotive engines, turbochargers are used in order to increase the engine efficiency. These turbochargers are understood as relatively small rotating parts working in aggressive conditions. Although they are usually...

Lukeš, Vladimír , Zemčík, Hana
Identification of material parameters using homogenization approach and SfePy software

The finite element solver SfePy and Python modules are used to identify the material parameters of the carbon fibers and the epoxy matrix which constitute a unidirectional long-fiber composite. The mathematical model of the heterogeneous structure is base on two-scale homogenization method&#...

Dyk, Štěpán
Vortex induced vibration of 1D beam-type continua

The contribution focuses on the modelling of vibration of 1D beam-type continua induced by cross flow of a fluid. The influence of fluid flow is represented by the harmonic force whose frequency depends on the Strouhal number. Based on the widely used FEM formulation, vector&#...

Al-Jaary, Ali H. Reshak
Odhalení vlivu kompresního mechanismu na elektronovou strukturu a související vlastnosti CrF3

The influence of the compression mechanism on the unit cell of CrF3 is investigated by means of density functional theory. The experimental lattice parameters under different pressure values starting from the ambient pressure up to 9.12 GPa were optimized so as to relax the cr...

Svoboda, Miloš , Beneš, Jan , Vobecká, Lucie , Slouka, Zdeněk
Mikrotomografická analýza strukturálních změn heterogenní kationtově výměnné membrány při bobtnání

3D reconstruction of heterogeneous ion-exchange membranes when swollen in an appropriate electrolyte by micro-computed tomography (μ-CT) can provide important information on structural changes caused by their swelling or shrinkage and used this knowledge along with their electrochemical characteristics for...

Loewenhoff, Thorsten , Linke, Jochen Max , Matějíček, Jiří , Rasiński, Marcin , Vostřák, Marek , Wirtz, Marius
Laser re-melting of tungsten damaged by transient heat loads

In the current study, a solid state disc laser with a wavelength of 1030 nm and maximum power of 5.3 kW was used to melt the surface of pure tungsten samples (manufactured according to ITER specifications by Plansee SE). Several combinations of laser power and traverse&#x...

Šipr, Ondřej , Minár, Jan , Ebert, Hubert
Vliv spin-orbitalní interakce na T-alfa term

The influence of the spin-orbit coupling (SOC) on the magnetic dipole term Tα is studied across a range of systems in order to check whether the Tα term can be eliminated from analysis of x-ray magnetic circular dichroism spectra performed via the spin moment sum rule.&#x...

Lindstedt, Lukasz , Vychytil, Jan , Dziewoński, Tomasz , Hynčík, Luděk
Numerické testování virtuálního modelu lidského těla v podmínkách dynamického zatížení podle norem FAR 23.562 a 25.562: předběžná studie

The main aim of the presented research was to check mechanical response of human body model under loads that can occur during airplane accidents and compare results of analysis with some results of experimental tests described in literature. In simulations the VIRTHUMAN model was&#...

Al-Jaary, Ali H. Reshak
Hydroxidy dusičnanu olovnatého: Silná optická nelinearita druhého řádu acentrického krystalu s vysokou odolností proti laserovému poškození

A comprehensive theoretical calculation for the complex first-order linear and the second-order non-linear optical dispersion of acentric lead nitrate hydroxide (Pb16(OH)16(NO3)16) single crystals was performed based on the experimental crystallographic data obtained by Chang et al

Tvarožek, Vladimír , Szabó, O. , Novotný, I. , Kováčová, S. , Škriniarová, J. , Šutta, Pavol
Plazmonické vlastnosti naprášených Au nano-ostrůvkových polí

The specificity of the formation of Au sputtered nanoisland arrays (NIA) on a glass substrate or on a ZnO thin film doped by Ga is demonstrated. Statistical analysis of morphology images (SEM, AFM) exhibited the Log-normal distribution of the size (area) of nanoislands—their modus&...

Al-Jaary, Ali H. Reshak
Odhalení spinově polarizovaných optických vlastností monoclinické α-Eu2 (MoO4) 3: přístup DFT + U

The spin polarized complex first-order linear optical dispersion reveals the spin-polarized electronic structure of aEu2(MoO4)3. Calculation explored the influence of the generalized gradient approximation plus the Hubbard Hamiltonian (GGA + U) on the band dispersion and the energy band gap of&#x...

Ibraheam, A. S. , Al‑Douri, Y. , Al‑Fhdawi, J. M. S. , AL‑Jumaili, Hamid S. , Verma, K. D. , Hashim, U. , Ayub, Ramzan Mat , Ruslinda, A. Rahim , Md Arshad, Mohd Khairuddin , Al-Jaary, Ali H. Reshak , Abd Hamid, Sharifah Bee Ee
Strukturální, optické a elektrické vlastnosti Cu2Zn1-xCdxSnS4 quinternarních slitin nanostruktur uloženého porézního křemíku

The Cu2Zn1−xCdxSnS4 quinternary alloy nanostructures with different Cd contents were grown using spin coating technique on porous silicon (63.93 %) substrate. The structural properties of Cu2Zn1−xCdxSnS4/PS were investigated by X-ray diffraction and field emission-scanning electron microscope (FE-SEM).

Vondráček, Martin , Cornils, Lasse , Minár, Jan , Warmuth, Jonas , Michiardi, Matteo , Piamonteze, Cínthia , Barreto, Lucas , Miwa, Jill , Bianchi, Marco , Hofmann, Ph H. , Zhou, Lihui , Kamlapure, Anand , Khajetoorians, Alexander Ako , Wiesendanger, Roland , Mi, Jianli , Iversen, Bo Brummerstedt , Mankovsky, Sergiy , Borek, St , Ebert, Hubert , Schüler, Malte , Wehling, Tim Oliver , Wiebe, Jens , Honolka, Jan
Nikl: časově-reverzní symetrii zachovávající partner železa v chalkogením topologickém izolantu

We report on the quenching of single Ni adatom moments on Te-terminated Bi2 Te2Se and Bi2Te3 topological insulator surfaces. The effect is noted as a missing x-ray magnetic circular dichroism for resonant L3,2 transitions into partially filled Ni 3d states of theory-derived occupancy&#x...

Krempaský, Július , Volfová, Henrieta , Muff, Stefan , Pilet, Nicolas , Landolt, Gabriel , Radović, Miroslav , Shi, Ming , Kriegner, Dominik , Holý, Václav , Braun, Jürgen W. , Ebert, Hubert , Bisti, Federico , Rogalev, Victor A. , Strocov, Vladimir N. , Springholz, Gunther , Minár, Jan , Dil, Jan Hugo
Identifikace bulkových a povrchových Rashba stavů v ferroelektrickém GeTe Identifikace bulkových a povrchových Rashba stavů v ferroelektrickém GeTe

Macroscopic ferroelectric order in α-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using soft x-ray angle-resolved photoemission (ARPES) reveals the&#...

Młyńczak, Ewa , Eschbach, Markus , Borek, St , Minár, Jan , Braun, Jürgen W. , Aguilera, Irene , Bihlmayer, Gustav , Döring, Sven , Gehlmann, Mathias , Gospodarič, Pika , Suga, Sau , Pluciński, Łukasz , Blügel, Stefan , Ebert, Hubert , Schneider, Claus Michael
Manipulace Fermiho povrchu externím magnetickým polem pro prototypický feromagnet

We consider the details of the near-surface electronic band structure of a prototypical ferromagnet, Fe(001). Using highresolution angle-resolved photoemission spectroscopy, we demonstrate openings of the spin-orbit-induced electronic band gaps near the Fermi level. The band gaps, and thus the Fermi&#...

Derondeau, Gerald , Minár, Jan , Ebert, Hubert
Hyperjemné pole v rodině BaFe2As2 a jejich vztah k magnetickému momentu

The hyperfine field Bhf and the magnetic properties of the BaFe2 As2 family are studied using the fully relativistic Dirac formalism for different types of substitution. The study covers electron doped Ba(Fe1−x Cox )2 As2 and Ba(Fe1−x Nix )2 As2 , hole doped (Ba1−x Kx )Fe...

Elmers, Hans Joachim , Wallauer, Robert , Liebmann, Marcus , Kellner, Jens , Morgenstern, Markus , Wang, Ruining , Boschker, Jos E. , Calarco, Raffaella , Sánchez-Barriga, Jaime , Rader, Oliver , Kutnyakhov, Dmytro , Chernov, Sergey V. , Medjanik, Katerina , Tusche, Christian , Ellguth, Martin , Volfová, H. , Borek, St. , Braun, Jürgen W. , Minár, Jan , Ebert, Hubert , Schönhense, Gerd
Mapováni spinů povrchových a bulkových Rashba stavů v tenkých vrstvách feroelektrického α-GeTe(111)

The breaking of bulk inversion symmetry in ferroelectric semiconductors causes a Rashba-type spin splitting of electronic bulk bands. This is shown by a comprehensive mapping of the spin polarization of the electronic bands in ferroelectric α- GeTe(111) films using a time-of-flight momentum&...

Kronenberg, Andreas , Braun, Jürgen W. , Minár, Jan , Elmers, Hans Joachim , Kutnyakhov, Dmytro , Zaporozhchenko, Anna V. , Wallauer, Robert , Chernov, Sergey V. , Medjanik, Katerina , Schönhense, Gerd , Kläui, Mathias , Chadov, Stanislav , Ebert, Hubert , Jourdan, Martin
Dirakův kužel a pseudogapped hustota stavů v topologické polovině Heuslerovy sloučeniny YPtBi

Topological insulators (TIs) are exciting materials, which exhibit unprecedented properties, such as helical spinmomentum locking, which leads to large torques for magnetic switching and highly efficient spin current detection. Here we explore the compound YPtBi, an example from the class of ...

Krempaský, Július , Muff, Stefan , Bisti, Federico , Fanciulli, Mauro , Volfová, Henrieta , Weber, Andreas P. , Pilet, Nicolas , Warnicke, Peter , Ebert, Hubert , Braun, Jürgen W. , Bertran, François , Volobuev, Valentine V. , Minár, Jan , Springholz, Gunther , Dil, Jan Hugo , Strocov, Vladimir N.
Společné propojení a manipulace magnetické a spin-polární interakce v miltiferotickém Rahba polovodiči

Entanglement of the spin–orbit and magnetic order in multiferroic materials bears a strong potential for engineering novel electronic and spintronic devices. Here, we explore the electron and spin structure of ferroelectric a-GeTe thin films doped with ferromagnetic Mn impurities to achieve ...

Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 71