Individual Professional Practice in the Company

Táto bakalárska práca sa zaoberá popisom činností a informačných technológií, s ktorými som sa stretol v priebehu absolvovania individuálnej odbornej praxe vo firme XEVOS Solutions s.r.o. Práca obsahuje popis zamerania firmy, v ktorej som vykonával prax, moje pracovné zaradenie a zadané úlohy, o ktorých následne pojednávam v jednotlivých kapitolách bakalárskej práce. Jedná sa hlavne o mapovanie počítačovej siete, tvorbu PPC reklám, konfiguráciu IP telefónov a zabezpečenie počítačovej siete pomocou RADIUS. V závere je zhrnutý prínos absolvovania individuálnej odbornej praxe a vyhodnotenie využitia znalostí, ktoré som nadobudol počas štúdia a tých, ktoré mi naopak chýbali.This bachelor thesis represents the descriptions of actions and information technologies which I came across during my individual professional practice in the company XEVOS Solutions s.r.o. This thesis contains the description of the focus of the company, my work position and tasks which I have been given - I write about these in following chapters. The areas of focus are mainly the following: network scanning, the making of PPC advertisements, configuration of IP telephones and securing of the network via RADIUS. In the end I have summarized the assets of my individual professional practice in the company and evaluation of the use of knowledge which I do have from studies and also of such knowledge which I did not have.440 - Katedra telekomunikační technikyvýborn

Solution of Optical Fiber Ends for VLC Applications

Cieľom tejto práce je vytvoriť optický vláknový vysielač v softvérovej aplikácii LightTools a nájsť najvhodnejšie pozície a zakončenia vláken v počte 7 a 19 s ohľadom na rozloženie optickej intenzity na 1/8 gule s 3 dB kolísaním optického výkonu. Následný cieľ po simuláciách v danom softvéri je vytvoriť skutočný vláknový vysielač s konfiguráciou zhodnou s najlepšími výsledkami dosiahnutými pri simulácii. Po skonštruovaní a nameraní výsledkov vláknového vysielača sa porovnajú simulované a reálne namerané výsledky. V úvode práce je vysvetlená problematika optických sietí. Ide o zhrnutie histórie štúdie svetla, optických veličín, optických vláknových a bezvláknových sietí a komponentov, ktoré sú v nich používané a tiež bezpečnosť optického žiarenia. Nasleduje postup simulácie a merania.The objective of this diploma thesis is to create an optical fiber transmitter in the software aplication LightTools and to find the most suitable mesh positions and terminations in numbers 7 and 19 considering the distribution of optical intensity on 1/8 of the sphere with 3 dB fluctuation of optical power. The following goal after the simulation in this software is to create a real fiber transmitter with a configuration that matches the most efficient achieved results in the simulation. After constructing and measuring the fiber transmitter results, the simulated and real measured results are compared. At the beginning of the work the relations of optical networks are explained. It is a summary of the study of light, optical quantities, optical fiber and fiber-free networks and components used in them and also optical radiation safety. Following is the simulation and measurement procedure.440 - Katedra telekomunikační technikyvelmi dobř

Ochrana doménových jmen

Ochrana doménových mien Život každého z nás je v súčasnosti stále viac závislý od informácií, pričom ich najbežnejším zdrojom sa stáva internet. Jedným z hlavných aspektov, s ktorým sa užívateľ internetu musí vysporiadať, je doménové meno, teda internetová adresa. Napriek tomu je bežné, že užívatelia internetu nerozlišujú medzi pojmami internet, prehliadač, vyhľadávač, či webová stránka. Nie sú oboznámený ani s právnym a technickým konceptom doménových mien. Tie sú prideľované na základe pravidla "first come, first served" teda prednosť má ten, kto si doménové meno zaregistruje ako prvý. To z neho robí cenný artikel a teda aj častý predmet právnych sporov. Cieľom mojej práce je analýza možností ochrany doménových mien, v súvislosti s absenciou ich komplexnej právnej regulácie, čo je jav nie výnimočný len pre Český právny poriadok. Prvá kapitola práce sa zaoberá sieťou Internet a jej základnou infraštruktúrou. Dôraz je kladený na doménové mená, ich technické aspekty, hierarchickú štruktúru a typológiu. Nasledujúca kapitola uvádza najdôležitejšie organizácie zapojené do procesu tvorby pravidiel a postupov, ktoré slúžia na zaistenie spolupráce medzi inštitúciami poverenými dohľadom nad chodom siete Internet a správou registrácie zdrojov číselných adries a systému doménových mien. Kapitola taktiež...Protection of domain names Life nowadays is much more dependent on information and the most common source of them right now is Internet. One of the main aspects, that users of Internet have to deal with, is a domain names, as a website address. Nevertheless it's common, that users do not differentiate between internet, browser, search engine or web page, nor are familiar with the legal and technical concept of domain names. Domains are allocated according to a first come first serve basis and that makes them valuable article and thus subject of common legal disputes. The purpose of my thesis is to analyze ways of legal protection of domain names and the absence of its legal regulation, which is not unique for Czech legal system. First chapter of my thesis deals briefly with internet and its basic infrastructure, including internet protocol, with deeper focus on domain names, their technical aspects, hierarchical structure and typology. Next chapter mentions the main organizations involved in creating rules and policies for cooperation among institutions authorized to oversee internet and managing the registration of internet number resources and domain name system. This chapter includes the description of main characteristics for the process for resolution of disputes according to UDRP (Uniform...Department of Business LawKatedra obchodního právaPrávnická fakultaFaculty of La

Giant spin-orbit effects on H-1 and C-13 NMR shifts for uranium(VI) complexes revisited: role of the exchange-correlation response kernel, bonding analyses, and new predictions

Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.Previous relativistic quantum-chemical predictions of unusually large H-1 and C-13 NMR chemical shifts for ligand atoms directly bonded to a diamagnetic uranium(VI) center (P. Hrobarik, V. Hrobarikova, A. H. Greif and M. Kaupp, Angew. Chem., Int. Ed., 2012, 51, 10884) have been revisited by two- and four-component relativistic density functional methods. In particular, the effect of the exchange-correlation response kernel, which had been missing in the previously used two-component version of the Amsterdam Density Functional program, has been examined. Kernel contributions are large for cases with large spin-orbit (SO) contributions to the NMR shifts and may amount to up to similar to 30% of the total shifts, which means more than a 50 ppm difference for the metal-bonded carbon shifts in some extreme cases. Previous calculations with a PBE-40HF functional had provided overall reasonable predictions, due to cancellation of errors between the missing kernel contributions and the enhanced exact-exchange (EXX) admixture of 40%. In the presence of an exchange-correlation kernel, functionals with lower EXX admixtures give already good agreement with experiments, and the PBE0 functional provides reasonable predictive quality. Most importantly, the revised approach still predicts unprecedented giant H-1 NMR shifts between +30 ppm and more than +200 ppm for uranium(VI) hydride species. We also predict uranium-bonded C-13 NMR shifts for some synthetically known organometallic U(VI) complexes, for which no corresponding signals have been detected to date. In several cases, the experimental lack of these signals may be attributed to unexpected spectral regions in which some of the C-13 NMR shifts can appear, sometimes beyond the usual measurement area. An extremely large uranium-bonded C-13 shift above 550 ppm, near the upper end of the diamagnetic C-13 shift range, is predicted for a known pincer carbene complex. Bonding analyses allow in particular the magnitude of the SO shifts, and of their dependence on the functional, on the ligand position in the complex, and on the overall electronic structure to be better appreciated, and improved confidence ranges for predicted shifts have been obtained

Unlocking Structural Diversity in Gold(III) Hydrides: Unexpected Interplay of cis/trans-Influence on Stability, Insertion Chemistry, and NMR Chemical Shifts

The synthesis of new families of stable or at least spectroscopically observable gold(III) hydride complexes is reported, including anionic cis-hydrido chloride, hydrido aryl and cis-dihydride complexes. Reactions between (C^C)AuCl(PR3) and LiHBEt3 afford the first examples of gold(III) phosphino hydrides (C^C)AuH(PR3) (R = Me, Ph, p-tolyl; C^C = 4,4′-di-tert-butylbiphenyl-2,2′-diyl). The X-ray structure of (C^C)AuH(PMe3) was determined. LiHBEt3 reacts with (C^C)AuCl(py) to give [(C^C)Au(H)Cl]–, whereas (C^C)AuH(PR3) undergoes phosphine displacement, generating the dihydride [(C^C)AuH2]-. Monohydrido complexes hydroaurate dimethylacetylene dicarboxylate to give Z-vinyls. (C^N^C)Au pincer complexes give the first examples of gold(III) bridging hydrides. Stability, reactivity and bonding characteristics of Au(III)-H complexes crucially depend on the interplay between cis and trans-influence. Remarkably, these new gold(III) hydrides extend the range of observed NMR hydride shifts from δ 8.5 to +7 ppm. Relativistic DFT calculations show that the origin of this wide chemical shift variability as a function of the ligands depends on the different ordering and energy gap between “shielding” Au(dπ)-based orbitals and “deshielding” σ(Au-H)-type MOs, which are mixed to some extent upon inclusion of spin-orbit (SO) coupling. The resulting 1H hydride shifts correlate linearly with the DFT optimized Au-H distances and Au-H bond covalency. The effect of cis ligands follows a nearly inverse ordering to that of trans ligands. This study appears to be the first systematic delineation of cis ligand influence on M-H NMR shifts and provides the experimental evidence for the dramatic change of the 1H hydride shifts, including the sign change, upon mutual cis and trans ligand alternation

Synthesis, structure and bonding of hexaphenyl thorium(IV): observation of a non-octahedral structure

Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.We report herein the synthesis of the first structurally characterized homoleptic actinide aryl complexes, [Li(DME)(3)](2)[Th(C6H5)(6)] (1) and [Li(THF)(12-crown-4)](2)[Th(C6H5)(6)] (2), which feature an anion possessing a regular octahedral (1) or a severely distorted octahedral (2) geometry. The solid-state structure of 2 suggests the presence of pseudo-agostic ortho C-H center dot center dot center dot Th interactions, which arise from sigma(C-H) -> Th(5f) donation. The non-octahedral structure is also favoured in solution at low temperatures.DFG, EXC 314, Unifying Concepts in Catalysi

Paramagnetic NMR of phenolic oxime copper complexes : a joint experimental and density functional study

This work was supported by EaStCHEM and the School of Chemistry. The authors would like to thank the EPSRC for computational support through the Collaborative Computational Project on NMR Crystallography (CCP-NC), via EP/M022501/1 and EP/J501542/1. SEA would like to thank the Royal Society and Wolfson Foundation for a merit award. Work at the TU Berlin has been carried out within the EU Marie-Curie Initial Training Network “pNMR”.1H and 13C pNMR properties of bis(salicylaldoximato)copper(II) were studied in the solid state using magic-angle-spinning NMR spectroscopy and, for the isolated complex and selected oligomers, using density-functional theory at the PBE0-1/3 // PBE0-D3 level. Large paramagnetic shifts are observed, up to δ(1H) = 272 ppm and δ(13C) = 1006 ppm (at 298 K), which are rationalised through spin delocalisation from the metal onto the organic ligand and the resulting contact shifts arising from hyperfine coupling. The observed shift ranges are best reproduced computationally using exchange-correlation functionals with a high fraction of exact exchange (such as PBE0-1/3). Through a combination of experimental techniques and first-principles computation, a near-complete assignment of the observed signals is possible. Intermolecular effects on the pNMR shifts, modelled computationally in the dimers and trimers through effective decoupling between the local spins via A-tensor and total spin rescaling in the pNMR expression, are indicated to be small. Addition of electron-donating substituents and benzannelation of the organic ligand is predicted computationally to induce notable changes in the NMR signal pattern, suggesting that pNMR spectroscopy can be a sensitive probe for the spin distribution in paramagnetic phenolic oxime copper complexes.PostprintPeer reviewe

Investigations on the Spin States of Two Mononuclear Iron(II) Complexes Based on N-Donor Tridentate Schiff Base Ligands Derived from Pyridine-2,6-Dicarboxaldehyde

Iron(II)-Schiff base complexes are a well-studied class of spin-crossover (SCO) active species due to their ability to interconvert between a paramagnetic high spin-state (HS, S = 2, $^{5}$T$_{2}$) and a diamagnetic low spin-state (LS, S = 0, $^{1}$A$_{1}$) by external stimuli under an appropriate ligand field. We have synthesized two mononuclear FeII complexes, viz., [Fe(L$^{1}$)$_{2}$](ClO$_{4}$)$_{2}$.CH$_{3}$OH (1) and [Fe(L$^{2}$)$_{2}$](ClO$_{4}$)$_{2}$.2CH$_{3}$CN (2), from two N$_{6}$–coordinating tridentate Schiff bases derived from 2,6-bis[(benzylimino)methyl]pyridine. The complexes have been characterized by elemental analysis, electrospray ionization–mass spectrometry (ESI-MS), Fourier-transform infrared spectroscopy (FTIR), solution state nuclear magnetic resonance spectroscopy, $^{1}$H and $_{13}$C NMR (both theoretically and experimentally), single-crystal diffraction and magnetic susceptibility studies. The structural, spectroscopic and magnetic investigations revealed that 1 and 2 are with Fe–N$_{6}$ distorted octahedral coordination geometry and remain locked in LS state throughout the measured temperature range from 5–350 K

Ein neutrales 1,4‐Diborabenzol als π‐Ligand in Actinoidkomplexen

Die π‐Koordination von Aren‐ und anionischen Heteroarenliganden ist ein allgegenwärtiges Strukturmotiv in der metallorganischen Chemie der d‐ und f‐Block‐Elemente. Im Gegensatz dazu sind vergleichbare π‐Wechselwirkungen neutraler Heteroarene, darunter auch solche neutraler, aromatischer Borheterocyclen, für den f‐Block weit weniger verbreitet, was z. T. mit einer geringeren Effektivität der Metall‐zu‐Ligand‐Rückbindung in Zusammenhang gebracht werden kann. Für die Actinoide sind π‐Komplexe mit neutralen Heteroarenliganden sogar gänzlich unbekannt. Durch Ausnutzung der außergewöhnlichen π‐Donorstärke eines 1,4‐Diborabenzols ist es uns nun gelungen, eine Reihe stabiler π‐Halbsandwichkomplexe des Thoriums(IV) und des Urans(IV) über einen erstaunlich einfachen Zugang zu generieren: Umsetzung eines 1,4‐Diborabenzols mit ThCl4(dme)2 bzw. UCl4 in Gegenwart einer Lewis‐Base. Hierdurch konnten die ersten Beispiele für Actinoidkomplexe mit einem neutralen Borheterocyclus als Sandwich‐artigem Liganden erhalten werden. Laut experimentellen und theoretischen Studien ist die starke Actinoid‐Heteroaren‐Wechselwirkung in diesen Molekülen im Wesentlichen von elektrostatischer Natur. Der kovalente Hauptbeitrag wird hingegen von der Ligand‐zu‐Metall‐π‐Wechselwirkung geleistet, während π/δ‐Rückbindungsanteile kaum eine Rolle spielen.EC/H2020/669054/EU/Boron-boron multiple bonding/multiBBDFG, 390540038, EXC 2008: Unifying Systems in Catalysis "UniSysCat

Synthesis, fluorescence and two-photon absorption properties of push-pull 5-aryl[3,2-b]thienothiophene derivatives

Three series of novel push-pull 5-aryl[3,2-b]thienothiophene derivatives functionalized with potent electron-withdrawing terminal moieties) were synthesized in moderate to excellent yields through Suzuki coupling followed by Knoevenagel condensation. These novel chromophores combine intense absorption in the near-UV down to the orange visible region in relation with a strong intramolecular charge transfer transition. By combining strong donor and acceptor, large fluorescence quantum yield are achieved as well as large two-photon absorption responses. Interestingly, due to the improved rigidity and electronic delocalization provided by the thienothiophene moiety (compared to the bis-thiophene one) larger one- and two-photon brightness values are achieved. As a result, a library of new fluorescent dyes showing enhanced brightness (up to and tunable fluorescence (ranging from blue to the NIR region) has been obtained which offer interesting promises for bioimaging applications.FCT, FEDER, QREN PEst-C/QUI/UI0686/2013 (FCOMP-01-0124-FEDER-037302