Transient grating spectroscopy (TGS) is a non-destructive and non-contact optoacoustic method used to measure the elastic and thermal properties of solid materials. TGS can be used to measure samples over a wide range of temperatures. However, our TGS in its current design is not optimal for high and low temperature measurements with sample rotation. The new TGS design, measurement automation...
The focus of advanced simulations of the interaction between plasmonic nanostructures and electromagnetic waves is on phenomena associated with nanostructures with dimensions on the order of nanometers. From this perspective, the nonlocal response of the material is crucial. Quantum properties of the electron gas may also become significant, especially near the interface. An example is...
The role of plasmonic electronic excitation in formation of bosonic electron Cooper pairs and establishing a superconductive state is subjected to a long-lasting research. Still, many aspects of these interactions remain unclear and open for further theoretical as well as experimental examination. The contribution aims on introduction to important aspects of the coherent interplay between...
Profesor Luboš Valenta se narodil 26. ledna 1924 v Praze. Studium na Přírodovědecké fakultě UK ukončil v roce 1949 a akademický titul RNDr. mu byl udělen v roce 1951. V letech 1950-1953 absolvoval vědeckou aspiranturu u prof. Zdeňka Matyáše a získal hodnost kandidáta fyzikálně-matematických věd CSc. V letech 1953-1955 byl vědeckým pracovníkem Fyzikálního ústavu ČSAV. V letech 1955 - 1968...
Ultrananocrystalline diamond (UNCD) films incorporating photoluminescent color centres have emerged as promising materials for quantum sensing applications due to their unique optical properties. This study investigates the synthesis, characterization, and enhancement of silicon-vacancy (SiV) centres in UNCD films. We successfully fabricated variously Si-doped diamond films using microwave...
The use of electron crystallography in structural biology is gradually
increasing due to the properties of electrons such as strong interaction with matter. Procedures for the preparation of protein crystal samples for electron
diffraction as well as the subsequent processing of diffraction data are gradually
being standardized. This work deals with the optimization of crystallization...
History and development of the IJD deposition method from laboratory prototypes to complex industrial systems
V této práci jsme se zaměřili na přípravu a charakterizaci tenkých vrstev vysokoteplotních supravodičů YBCO připravených metodou IJD. V rámci výzkumu jsme připravili celkem 11 vzorků ve dvou sériích, lišících se použitým materiálem substrátu: MgO a SrTiO$_3$. Jednotlivé vzorky v rámci série se lišily teplotou substrátu během depozice. Ta se pohybovala mezi 480~°C a 530~°C pro MgO sérii a mezi...
Společnost CAN SUPERCONDUCTORS, s.r.o. je jediným průmyslovým výrobcem
vysokoteplotních supravodivých materiálů v České republice. Společnost byla založena už
v roce 1997 a nyní dodává produkty do více něž 45 zemí po celém světe. Hlavními produkty
jsou supravodiče na bázi oxidů kovů vzácných zemin a mědi, jak v polykrystalické, tak i
v jedno-doménové podobě. Jsme schopni vyrobit různé...
Multiple applications (like LEDs) require growing high crystalline quality buffer layers before active region. These are the layers at the very bottom of structures, where on the boundary between sapphire and nitride many dislocations are created due to large lattice mismatch. It is important to improve the crystalline quality in this buffer layer, so that the active region has high internal...
The presentation is focused on two original unbiased estimation techniques which are suitable for 2D and 3D image analysis. The first method is focused on the unbiased estimation of correlation dimension which is based on the Fourier image of given point set and its averaged power spectrum over all rotations in the Hilbert space. The second method is focused on the unbiased estimation of Renyi...
Berry curvature expresses the curvature of the reciprocal space, in a similar manner as magnetic field express curvature of the real space, resulting in a curved transport of electrons in solids. Therefore, Berry curvature is a key to describe various transport phenomena such as anomalous Hall effect, anomalous Nerst effect, orbital magnetization, topological insulators or electric...
České vysoké učení technické v Praze v současné době staví nové zařízení pro neutronové zobrazování na výzkumném reaktoru LVR-15. Projekt začal na jaře roku 2022 a jedná se o spolupráci mezi ČVUT v Praze, Helmholtz-Zentrum Berlin a Heinz Maier-Leibnitz Zentrum (FRM II). Zařízení je určeno pro techniky neutronové radiografie a tomografie s využitím tepelných neutronů. Očekává se, že zařízení...
Transition metal nitrides (TMNs) have emerged as a promising alternative to precious metals thanks to their similar optical response and the additional advantages of refractory nature and compatibility with microelectronic industry fabrication process. This presentation will discuss the optical tunability of nanomaterials based on titanium nitride (TiN) in relation to their photothermal...
Crystal structure analysis by diffraction methods is a standard, robust technique, that allows the solution of most new crystalline materials. It works even when the data suffers from systematic and statistical errors. However, some cases can be more challenging, and standard approaches do not easily solve the problem at hand. In this talk, we will show some examples of challenging structures...
Onsemi – představení společnosti a možnosti spolupráce
Karbid křemíku – budoucnost výkonové elektroniky právě začíná
Fatigue crack initiation and propagation play an important role in fatigue properties, where they are shown to be strongly associated also with macroscopic residual stresses (RS). During additive manufacturing using the selective laser melting technology, a complex residual stress distribution is created that can significantly affect the printing itself and also the mechanical properties of...
