Ultraviolet spectroscopy of meteoric debris: In situ calibration experiments from earth orbit

It is proposed to carry out slitless spectroscopy at ultraviolet wavelengths from orbit of meteoric debris associated with comets. The Eta Aquarid, Orionid/Halley, and the Persied/1962 862 Swift-Tuttle showers would be principal targets. Low light level, ultraviolet video technique will be used during the night side of the orbit in a wide field, earthward viewing mode. Data will be stored in compact video cassette recorders. The experiment may be configured as a GAS package or in the HITCHHIKER mode. The latter would allow flexible pointing capability beyond that offered by shuttle orientation of the GAS package, and doubling of the data record. The 1100 to 3200 A spectral region should show emissions of atomic, ionic, and molecular species of interest on cometary and solar system studies

RESEARCH OF ACOUSTIC MEASUREMENTS OF BENDING FORCE ON HIGH VOLTAGE INSULATORS

The aim of this research was to research and verify the possibilities of using microphone to determine mechanical load acting on high voltage insulator. The insulator features a cable hole, which can be used for optical cables. Let’s use this hole as a microphone mount in order to listen to sounds inside of an insulator. The cable hole and the insulator end holes were filled with insulating foam to insulate microphone from the external interferences. Acoustic measurements were performed on the outdoor post insulator C30-850-II. The insulator was placed in bending machine and was repeatedly mechanically stressed by bending forces. The results of this research verify the suitability of the selected method for future use in the proposed device for detection of mechanical overload of high-voltage insulators

Nuclear Magnetic Resonance Quantum Computing Using Liquid Crystal Solvents

Liquid crystals offer several advantages as solvents for molecules used for nuclear magnetic resonance quantum computing (NMRQC). The dipolar coupling between nuclear spins manifest in the NMR spectra of molecules oriented by a liquid crystal permits a significant increase in clock frequency, while short spin-lattice relaxation times permit fast recycling of algorithms, and save time in calibration and signal-enhancement experiments. Furthermore, the use of liquid crystal solvents offers scalability in the form of an expanded library of spin-bearing molecules suitable for NMRQC. These ideas are demonstrated with the successful execution of a 2-qubit Grover search using a molecule ($^{13}$C$^{1}$HCl$_3$) oriented in a liquid crystal and a clock speed eight times greater than in an isotropic solvent. Perhaps more importantly, five times as many logic operations can be executed within the coherence time using the liquid crystal solvent.Comment: Minor changes. Published in Appl. Phys. Lett. v.75, no.22, 29 Nov 1999, p.3563-356

Supporting Server for Theoretical Computer Science Teaching

Import 03/11/2016Tato diplomová práce popisuje server pro podporu výuky teoretické informatiky, konkrétně zaměřený na převody mezi NP-úplnými problémy. Server, kromě toho že obsahuje potřebnou teorii k dané oblasti, umožňuje uživatelům zobrazit průběh vybraných převodů mezi NP-úplnými problémy a na zobrazeném průběhu výpočtu lépe pochopit princip fungování těchto algoritmů. Samotný text této práce se pak věnuje popisu nezbytné teorie, analýze, návrhu a zejména popisu implementace řešení jako takové, včetně použitých technologií.This diploma thesis describes supporting server for theoretical computer science teaching, specifically focusing on reductions between NP-complete problems. Server, except that it contains necessary theory of the topic, allows users to view progress of selected reductions between NP-complete problems and on displayed calculation to better understand principles of working of these algorithms. The text of this work deals with description of essential theories, analysis, design and especially description of implementation of the solution, including technologies used.460 - Katedra informatikydobř

Community Detection Methods in Multi-layer Networks

Táto práca sa zaoberá problematikou detekcie komunít na viacvrstvových sieťach. Cieľom tejto práce bola implementácia vybraných metód na detekciu komunít a ich následné použitie vo webovej aplikácie. Výsledkom práce je webová aplikácia umožňujúca analyzovať a vyhodnocovať viacvrstvové siete z pohľadu detekcie komunít.This thesis deals with the topic of community detection in multi-layered networks. The goal of this work was to implement selected community detection methods and its subsequent use in a web application. The result of this thesis is a web application, which enables to analyze and evaluate multi-layer networks from the perspective of communities.460 - Katedra informatikyvýborn

MgB2 radio-frequency superconducting quantum interference device prepared by atomic force microscope lithography

A new method of preparation of radio-frequency superconducting quantum interference devices on MgB2 thin films is presented. The variable-thickness bridge was prepared by a combination of optical lithography and of the scratching by an atomic force microscope. The critical current of the nanobridge was 0.35 uA at 4.2 K. Non-contact measurements of the current-phase characteristics and of the critical current vs. temperature have been investigated on our structures.Comment: RevTeX4. Accepted in Appl. Phys. Let

Complexes of 1,4,7-triazacyclononane derivatives

Tato práce se zaměřuje na přípravu monoamidu makrocyklu H3NOTA, který byl připraven několika krokovou syntézou. Ligand byl charakterizován pomocí NMR, MS a rentgenové difrakční analýzy. Potenciometricky bylo studováno acidobazické chování ligandu. Byly stanoveny čtyři protonizační konstanty pKa , které jsou nižší než hodnoty protonizačních konstant ligandu H3NOTA. Potenciometricky byly zkoumány i koordinační vlastnosti s ionty vybraných přechodných kovů, ionty biologického zájmu a lithnými ionty. Konstanty stability komplexů ukazují, že monoethyl amidický derivát H3NOTA tvoří méně stabilní komplexy než diethylamidický derivát. Konstanty stability pro komplexy s derivatizovanými ligandy jsou nižší než pro komplexy s H3NOTA. Pomocí 71 Ga NMR byla zkoumána kinetika komplexace Ga3+ při různých pH a byly stanoveny rychlostní konstanty a poločasy komplexace. Poločasy komplexace jsou při pH = 1 pro oba ligandy nižší než pro ligand H3NOTA. Klíčová slova: makrocyklické komplexy, termodynamická stabilita, formační kinetika, radiofarmakaThe aim of this thesis was to prepare monoamide of macrocycle H3NOTA, which was prepared by multiple step synthesis. Ligand was characterized by NMR, MS and X-ray difraction analysis. Acid-base properties were studied by potentiometric titrations. Four protonation constants pKa`s were found and these protonation constants are lower than pKa`s of H3NOTA. Coordination properties with selected metal ions from the first row of transition metal, metal ions of biological interest and with lithium ions were investigated by potentiometric titration. Stability constants show that monoethylamide derivative of macrocycle H3NOTA forms complexes with lower stability than diethylamide derivative of macrocycle H3NOTA. Stability constants for complexes which contains amide group are lower than for H3NOTA complexes. Kinetics of Ga3+ complexation was investigated at different pH by 71 Ga NMR. The rate constants of and half-lives of complexation were determined at pH = 1. The rate constant was higher and the half-life of complexation was shorter than for H3NOTA ligand. Key words: macrocyclic complexes, thermodynamic stability, formation kinetics, radiopharmaceuticalKatedra anorganické chemieDepartment of Inorganic ChemistryFaculty of SciencePřírodovědecká fakult

Individual Professional Practice in the Company

Tento dokument popisuje priebeh mojej odbornej bakalárskej praxe vo firme SDE Software Solutions. Firma sa zaraďuje medzi outsourcingové firmy a zameriava sa na americký trh. Vo firme som bol zaradený v tíme, ktorý spolupracuje so spoločnosťou Measurement Incorporated, ktorá ponúka vzdelávacie služby. Podieľal som sa na testovaní novej platformy pre online testovanie OASys ako aj na integrácii produktu Pegwriting s SSO službou Clever.This document describes my bachelor’s practice at SDE Software Solutions. The company belongs to outsourcing companies and focuses on the American market. Within the company I was assigned to a team, which cooperates with Measurement Incorporated, a company which provides educational services. I have been involved in the testing of a new platform for online testing Oasys as well as in Pegwriting’s integration with SSO service Clever.460 - Katedra informatikyvýborn

Ultraviolet spectroscopy of meteoric debris of comets

It is proposed to carry out slitless spectroscopy at ultraviolet wavelengths from orbit of meteoric debris associated with comets. The Eta Aquarid and Orionid/Halley and the Perseid/1962 862 Swift-Tuttle showers would be principal targets. Low light level, ultraviolet video technique will be used during night side of the orbit in a wide field, earthward viewing mode. Data will be stored in compact video cassette recorders. The experiment may be configured as a GAS package or in the HITCHHIKER mode. The latter would allow flexible pointing capability beyond that offered by shuttle orientation of the GAS package, and doubling of the data record. The 1100 to 3200 A spectral region should show emissions of atomic, ionic, and molecular species of interest on cometary and solar system studies

About Edge Detection in Digital Images

Edge detection is one of the most commonly used procedures in digital image processing. In the last 30-40 years, many methods and algorithms for edge detection have been proposed. This article presents an overview of edge detection methods, the methods are divided according to the applied basic principles. Next, the measures and image database used for edge detectors performance quantification are described. Ordinary users as well as authors proposing new edge detectors often use Matlab function without understanding it in details. Therefore, one chapter is devoted to some of Matlab function parameters that affect the final result. Finally, the latest trends in edge detection are listed. Picture Lena and two images from Berkeley segmentation data set (BSDS500) are used for edge detection methods comparison