Analyse of thermal phenomena using thermal network

Cílem této práce je vytvoření algoritmu pro řešení ustáleného stavu tepelných procesů, algoritmu pro řešení přechodového stavu tepelných procesů a algoritmus pro řešení ventilačních sítí. Současně mají výsledné aplikace splňovat podmínky vyplývající z očekávaného využití jako podpora výuky.The aim of this work is to create an algorithm for solving steady-state thermal processes, algorithms for dealing with the transition state of thermal processes and the algorithm for solving ventilation networks. At the same time, the resulting application were expected to meet the conditions arising from the use as teaching aid.

Hledání APN permutací ve známých APN funkcích

In the thesis a new way of checking whether a function is CCZ-equivalent to a permutation is given. The results for known families of almost perfect nonlinear (APN) functions are presented for functions defined over GF(2n ), for even n ≤ 12. The ways how to reduce the number of polynomials from each family are studied. For functions of the form x3 + a-1 tr1(a3 x9 ) it is shown, that they cannot be CCZ-equivalent to a permutation on fields GF(24n ) for n ∈ ℕ .V práci je představen nový způsob jak určit, jestli je daná funkce CCZ-ekvivalentní nějaké permutaci. Výsledky pro známé rodiny APN funkcí jsou prezentovány pro tělesa GF(2n ), kdy n ≤ 12 sudé. Dále jsou studovány způsoby jak snížit množství polynomů z jednotlivých rodin, které je nutné prozkoumat. Pro funkce tvaru x3 + a-1 tr1(a3 x9 ) je ukázáno, že nemohou být CCZ-ekvivalentní žádné permutaci v tělesech GF(24n ) pro n ∈ ℕ .Katedra algebryDepartment of AlgebraFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult

Analysis of general strength conditioning for runners - case study

Title: Analysis of general strength conditioning for runners - case study Elaborated: Jiri Pavlu Supervisor: RNDr., PaedDR. Pavel Cervinka, Ph.D. Aims: The aim of this thesis is the analysis of two preparatory periods (2017-2018; 2018-2019) in terms of general strength conditioning. After this content analysis I will compare them with each other and then with the literature. Data will be collected and analyzed from training diaries. Methods of work: This thesis was created using content analysis method from two preparation periods. The training notes were provided by Dukla Praha top runners specialized on middle and long tracks. The acquired data focusing just on general strength preparation were compared to professional literature and then with each other. Comparative method was used for this comparison. Results: The amount of training units aiming at development of general strength abilities compared to literature is less than idealized. The overal ratio of general strength preparation to the total volume of load was higher in the first preparation period. The most used method which occured in the examined files was strength-endurance method and was practised in the form of circuit training. The main means of training which was apparent in almost all training units was self-weight exercise. Key...Název práce: Analýza všestranného silového tréninku u běžců - případová studie Zpracoval: Jiří Pavlů Vedoucí bakalářské práce: RNDr., PaedDR. Pavel Červinka, Ph.D. Cíle práce: Cílem této práce je rozbor dvou přípravných období (2017-2018; 2018-2019) z hlediska všestranné silové přípravy. Po této obsahové analýze je budu porovnávat s odbornou literaturou a poté i mezi sebou navzájem. Data budou získána a analyzována z tréninkových deníků. Metodika práce: K tvorbě této práce byla použita metoda obsahové analýzy tréninkových deníků dvou přípravných období. Deníky byly vypůjčeny od vrcholových běžců na střední a dlouhé tratě z oddílu ASC Dukla Praha. Tato získaná data, týkající se pouze všestranné silové přípravy, byla porovnána s odbornou literaturou a poté mezi sebou navzájem. K tomuto porovnání byla použita metoda komparativní. Výsledky práce: Množství tréninkových jednotek mířící svým účinkem na rozvoj všestranně silových schopností je v porovnání s odbornou literaturou menší, než je idealizováno. Poměr všeobecné silové přípravy k celkovému objemu zatížení byl v prvním přípravném období vyšší. Nejvyužívanější metodou, vyskytující se ve zkoumaných souborech byla metoda silově- vytrvalostní a nejčastěji byla praktikována organizační formou kruhového tréninku. Hlavním prostředkem nacházejícím se téměř...AtletikaFaculty of Physical Education and SportFakulta tělesné výchovy a sport

Idee Jana Amosa Komeńskiego jako inspiracja dla andragogów

The content of the article focuses on the presentation of the person and work of Jan Amos Comenius research in terms of Czech researchers of his legacy. The author discusses the most important ideas, beliefs and works of the said teacher proving timeliness of their content. The author encourages you to regularly reading and studying thoughts contained there, in order to find in them inspiration for the work of modern educators.Treść artykułu skupia się na prezentacji osoby i dorobku naukowego Jana Amosa Komeńskiego w ujęciu czeskich badaczy jego spuścizny. Autor omawia najważniejsze idee, poglądy i dzieła wspomnianego pedagoga udowadniając aktualność ich treści. Autor zachęca do regularnego czytania jego dzieł i studiowania zawartych tam myśli, celem znajdowania w nich inspiracji dla pracy współczesnych andragogów i pedagogów

Aplication of FEM to the plane task

Cílem práce je naprogramovat algoritmus metody konečných prvků pro jednoduchou rovinou úlohu. Programový systém ANSYS bude využit pro přípravu modelu, pro zobrazení vypočtených výsledků a pro verifikaci algoritmuPurpose of this work is to programme FEM algorithm for evaluation of simple plane task. Software solution ANSYS will be used for preparation of model and verification of our algorithm.

REMEDIATION TECHNOLOGY OF CLOCHE REPLACEMENT FOR WW2 FORTIFICATION IN THE CZECH REPUBLIC

Nowadays many parts of the Czechoslovak border fortification built in 1935 – 1938 have been sold to the private owners who want to reconstruct it. One of the biggest problems while reconstructing these objects is missing cloches. The aim of this study is to find solution of this problem. Authors wanted to offer the owners (usually clubs of military history) authentic design of the cloche for low cost, high durability and full functionality of the cloche that enables installation of original weapons.A result of the work was a development of a technical solution of the cloche consisting of a replica of the upper part made of reinforced concrete in combination with lower part made of concrete. This unique technical solution was confirmed as an utility model CZ32920(U1). Remediation measure was approved by the team at the pillbox T-S 20 in Červený Kostelec in 2019

An Ab Initio Study of Pressure-Induced Changes of Magnetism in Austenitic Stoichiometric Ni2MnSn

We have performed a quantum-mechanical study of a series of stoichiometric Ni2MnSn structures focusing on pressure-induced changes in their magnetic properties. Motivated by the facts that (i) our calculations give the total magnetic moment of the defect-free stoichiometric Ni2MnSn higher than our experimental value by 12.8% and (ii) the magnetic state is predicted to be more sensitive to hydrostatic pressures than seen in our measurements, our study focused on the role of point defects, in particular Mn-Ni, Mn-Sn and Ni-Sn swaps in the stoichiometric Ni2MnSn. For most defect types we also compared states with both ferromagnetic (FM) and anti-ferromagnetic (AFM) coupling between (i) the swapped Mn atoms and (ii) those on the Mn sublattice. Our calculations show that the swapped Mn atoms can lead to magnetic moments nearly twice smaller than those in the defect-free Ni2MnSn. Further, the defect-containing states exhibit pressure-induced changes up to three times larger but also smaller than those in the defect-free Ni2MnSn. Importantly, we find both qualitative and quantitative differences in the pressure-induced changes of magnetic moments of individual atoms even for the same global magnetic state. Lastly, despite of the fact that the FM-coupled and AFM-coupled states have often very similar formation energies (the differences only amount to a few meV per atom), their structural and magnetic properties can be very different

On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn

The constitution of the two phase diagrams Nb-Mn and Ta-Mn has been determined from light optical and transmission and scanning electron microscopy (LOM, TEM and SEM) with energy dispersive (EDX) as well as wavelength dispersive (WDX) X-ray spectroscopy, X-ray powder (XPD) and single crystal diffraction (XSCD), differential thermal analysis (DTA) and/or differential scanning calorimetry (DSC). The Laves phases NbMn2 and TaMn2 are the only binary compounds in these systems. High-temperature differential thermal analyses revealed congruent melting for NbMn2 with T,(NbMn2) = 1515 +/- 15 degrees C, whereas TaMn2 melts incongruently with T-m(TaMn2)= 1797 +/- 40 degrees C close to a depleted peritectic reaction. Both Laves phases engage in eutectic reactions l (Mn) + Nb(Ta)Mn-2 (T-eut = 1220 +/- 10 degrees C at 4.9 at% Nb and T-eut = 1234 +/- 10 degrees C at 0.7 at% Ta, respectively). NbMn2 also forms a eutectic with (Nb): l (Nb) + NbMn2 at T-eut = 1493 +/- 15 degrees C and 53.2 at% Nb. Mn shows remarkably large maximum solid solubilities of 19.4 at% Mn in (Nb) as well as of 21.3 at% Mn in (Ta). Detailed atom site distribution has been established for the Laves phases by means of temperature dependent X-ray single crystal data (both C14 - MgZn2-type). Combined data from XPD, EDX/WDX and SEM microstructure indicate that for both Laves phases extended homogeneity regions exist: Nb1+xMn2+x (62.5-73.0 at% Mn at 950 degrees C: -0.19 <= x <= 1.125) and Ta1+xMn2-x (59.5-68.5 at % Mn: -0.055 <= x <= 1.215). Density functional theory (DFT) calculations favor Nb(Ta)/Mn antisite occupation rather than defects. The phases, "NbMn" and "TaMn", adopted earlier in the literature as binary system inherent compounds, were shown (TEM, WDX electron microprobe data and X-ray Rietveld refinements) to be oxygen stabilized phases of the Ti4Ni2O type (so-called eta(eta)-phases) with modified Nb(Ta)/Mn site substitution to comply with the formula Nb(Ta)(3-x)Mn3+xO1-y (defect eta-W3Fe3C-type). From magnetic susceptibility and magnetization measurements, both oxide stabilized eta phases eta-Nb3Mn3O1-y and eta-Ta3Mn3O1-y were found to order ferromagnetically below T-c similar to 77 K, but the Laves phases NbMn2, TaMn2 reveal weakly temperature dependent paramagnetism. No trace of the rhombohedral kyphase (W6Fe7-type) has been encountered in our investigation of the two binary phase diagrams. Thermodynamic and transport properties (specific heat, electrical resistivity and magnetic susceptibility/magnetization) classify the Laves phases with metallic behavior whilst mechanical properties (elastic moduli from DFT and nanoindentation as well as hardness and thermal expansion) group both Laves phases among rather hard and brittle intermetallics. Based on (i) the experimentally derived constitution of the Nb-Mn and Ta-Mn systems, and (ii) on new own DFT data of the energy of formation of the Laves phases, a CALPHAD (CALculation of PHAse Diagrams) calculation of both systems was made providing a complete set of optimized thermodynamic data. Furthermore, the DFT calculations provided information on the instability of the eta-Ta3Mn3 structure and the atom-site specific stabilization effect of oxygen.Web of Science865art. no. 15871

Disease prevention not decolonization: a model for fecal microbiota transplantation in patients colonized with multidrug-resistant organisms

Fecal microbiota transplantation (FMT) yields variable intestinal decolonization results for multidrug-resistant organisms (MDROs). This study showed significant reductions in antibiotic duration, bacteremia, and length of stay in 20 patients colonized/infected with MDRO receiving FMT (compared with pre-FMT history, and a matched group not receiving FMT), despite modest decolonization rates

Algortihms for proving primality

The goal of the thesis is introducing the reader to some of the algori- thms for proving primality along with practical usage of some of these algorithms. The main objective of the thesis is a presentation of Goldwasser-Killian primality test, which can be used to produce primality certificates, which can be verified very quickly. For better understanding of the test the thesis also includes an in- troduction to elliptic curves, which are the basis of the test. The thesis also shows how is a group of points on elliptic curves constructed and how to use this infor- mation for construction of algebraic formula for a sum of two points on a curve. Powered by TCPDF (www.tcpdf.org