National Repository of Grey Literature 32,183 records found  beginprevious32174 - 32183  jump to record: Search took 1.90 seconds. 


Stereoscopic Observations of Solar Radio Emissions by the S/WavesInstrument onboard the STEREO Spacecraft
Krupař, Vratislav ; Santolík, Ondřej (advisor) ; Krucker, Samuel (referee) ; Wimmer-Schweingruber, Robert F. (referee)
This PhD thesis is primarily dedicated to a study of type III radio bursts observed by the S/Waves instrument onboard Solar TErrestrial RElations Observatory (STEREO). These emissions are produced by beams of suprathermal electrons escaping the corona along open magnetic field lines during increased solar activity. As fast electrons propagate in the interplanetary (IP) medium, Langmuir waves are generated at the local electron plasma frequency fpe by a bump-on-tail instability and can be afterwards converted by a non-linear process into radio emissions at fpe and/or 2fpe: type III radio bursts. We have developed a goniopolarimetric (GP, also referred to as direction-finding) inversion using the Singular Value Decomposition (SVD) technique for electric measurements on three non-orthogonal antennas. It allows us to retrieve both wave vector directions and polarization properties of incident waves. We have also investigated the influence of extended sources (as a typical feature of type III radio bursts) on measured spectral matrices. We have found an empirical relation between apparent source sizes and spectral matrices decomposed by SVD. Abovementioned techniques have been extensively tested on data obtained by the High Frequency Receiver (HFR, a part of S/Waves). We have performed statistical analysis of a...

Appreciatve suffixation in spanish and strategy of its translation
ŠINDELÁŘOVÁ, Kateřina
The bachelor thesis describes possible translations of some diminutives and augmentatives and compares the frequency of the use of these translations on the basis of their occurance in The Czech national corpus. There are theoretically explained the ways of enriching vocabulary, yet the biggest part is dedicated to appreciative suffixation in czech and spanish language, to ways of formation of diminutives and augmentatives and the strategy of their translations. In every chapter there are mentioned the most common czech and spanish apreciative suffixes and also the description of modifications of the derived words. There are also available graphs which show the frequency of the use of different translations which appear in corpus.

Membraneless speaker
Kovář, Josef ; Šteffan, Pavel (referee) ; Pavlík, Michal (advisor)
The bachelor thesis consists of theoretic basics and describes the design and construction of one-channel membraneless speaker. Absence of mechanical components gives the membraneless speaker no frequency limitation. The design consists of power source, control electronics, which modulates the signal, convertor and output transformer. The power source is realized by transformer, which lowers the voltage and stabilizators. Modulation is provided by integrated circuit TL 594, its duty is adjusted by potentiometer P1 and frequency by potentiometer P2. Power conversion provides dual forward converter. As a output transformer was used transformer from color television.

Properties of superconductors in the terahertz frequency region
Šindler, Michal ; Skrbek, Ladislav (advisor) ; Lipavský, Pavel (referee) ; Samuely, Peter (referee)
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Beer in Czech society in 2016
Vinopal, Jiří
In September 2016 CVVM SOÚ AV ČR replicated some of the questions about beer, which constitute a part of research project Pubs and Beer in Czech Society that is under way since 2004. This press release maps basic trends about the share of consumers among Czech citizens and about both amount and frequency of beer consumption from 2004 to 2016. The status of non-alcoholic beer is mentioned as well.

SMV-2016-25: Optical frequency reference
Lazar, Josef ; Pokorný, Pavel ; Oulehla, Jindřich
The contract research was oriented to research and development of refernce system for fundamental metrology of optical frequencies.

Methodic of vertical deflections determination of bridge construction by the radar interferometric technology
Antoš, Filip ; Talich, Milan ; Glöckner, M. ; Böhm, Ondřej ; Soukup, Lubomír ; Havrlant, Jan ; Závrská, M. ; Šolc, Jakub
The methodology provides guidance for determining the vertical deflection of bridge structures using radar interferometry technology. The vertical deflection of bridges are primarily caused by stress during transit of vehicles. The deflections are simultaneously measured by radar throughout the length of the monitored structure. The measurement is continuous with a high sampling frequency (200 Hz) and with high precision (0.01 mm). It is believed the use of interferometric radar IBIS-S Italian manufacturer IDS. General recommendations and conclusions are valid for every kind of radar.

Functional investigation of players in football tennis
Pavlatová, Lenka ; Süss, Vladimír (advisor) ; Kočíb, Tomáš (referee) ; Kračmar, Bronislav (referee)
Název: Funkční vyšetření hráček nohejbalu Název v angličtině: Functional investigation ofplayers in football tennis Klíčová slova: Funkční testy, zatížení, nohejbal, trénovanost. Cíl práce: Cílem diplomové práce je popsat, na základě funkčních testů a monitorování srdeční frekvence, zatížení hráček v nohejbalu. Závěry: Zatížení hráček nohejbalu má převážně aerobní charakter, nezanedbatelné zastoupení má však i aerobně - anaerobní zóna. V provedeném měření nebylo zaznamenáno anaerobně -laktátové zatížení, ale můžeme se domnívat, že při vypjatých zápasech nebo ve vrcholných utkání, se budou hráčky nohejbalu v tomto pásmu pohybovat. Zjištěné výsledky ukazují na špatnou trénovanost hráček v oblasti vytrvalosti, avšak ve srovnání s výsledky SF z utkání, není asi příliš nutná. Předpokládali jsme, že zatížení v utkání v nohejbale má intervalový charakter. Z výsledků je patrné, že se nejedná o typickou intervalovou zátěž a tudíž nemůžeme hypotézu 1potvrdit. 5

Conduction of Diadynamic current in tissue of the human organism
Šmelhaus, Jaroslav ; Pánek, David (referee) ; Malá, Jitka (advisor)
English abstract: Thesis title: Conduction of Diadynamic current in tissue of the human organism Thesis is executed as primary experiment, based on an investigation of DD current's diffusion. Experiment is focused on six volunteers, showing no symptoms of fatigue, muscular overload or diseases of neuro - muscular transmission. To verify established intentions and goals, apparatus PhySys (Zimmer medizin system) was used, from which I applied DD current. I used 8 gutter polyEMG apparatus as a measure methodology to record the distribution of the current. Data analyses and evaluation of EMG signal was processed in program MyoResearch XP. The research has immediate character and its results are not statistically managed for the reason of low number of inmates. Name: Bc. Jaroslav Šmelhaus Keywords: Diadynamic current, EMG, action potential, conduction of electric current 11