Photocatalytic oxidation of methyl tert-butyl ether in presence of various phase compositions of TiO2

MTBE (methyl tert-butyl ether) represents a rising threat to the environment, especially drinking water, and its effective removal (with all by-products) is necessary. Even a very low concentration of MTBE makes the water undrinkable; therefore, an effective treatment has to be developed. This work is focused on MTBE photocatalytic oxidation in presence of various TiO2 photocatalysts with different phase composition prepared by different methods. It was confirmed the phase composition of TiO2 had the most significant influence on the photocatalytic degradation of MTBE. The rutile phase more easily reduces adsorbed oxygen by photogenerated electrons to superoxide radical, supporting separation of charge carriers. The presence and concentrations of by-products have to be taken into account as well. The conversion of total organic carbon (TOC) was used for the comparison, 40% of TOC was removed after 1 h of irradiation in presence of TiO2-ISOP-C/800 photocatalyst composed of anatase and rutile phase.Web of Science101art. no. 3

Technical and Economic Analysis of Industrial Laundry

Tato práce se zabývá technickou a ekonomickou analýzou Laboratoře energeticky náročných procesů, která se zabývá optimalizací energetických procesů. Jejím cílem je vytvořit výpočtový nástroj k určení celkové finanční bilance laboratoře, založený na znalosti procesu zpracování prádla a schopnosti identifikovat a vyčíslit veškeré položky, které do bilance laboratoře vstupují.This thesis deals with the technical and economic analysis of energy-intensive processes laboratory, which focuses on the optimalization of energy processes. Its aim is to create a computational tool to determine the overall financial balance of laboratory, based on knowledge of industrial laundry and ability to identify and quantify correctly all the items entering the balance of the laboratory.

Laser Proximity Scanner - Mechanics

Tato práce se zabývá možností použít průmyslový optický snímač vzdálenosti jako 3D proximitní skener. Cílem práce je navrhnout mechaniku skeneru, která by měnila směr měření ve dvou osách. Ve skeneru je použito nepřímé změny směru paprsku pomocí zrcátka. Dále se práce zabývá návrhem řídicího obvodu, který má za úkol řídit směr měření a sběr naměřených dat. Řídicí obvod je založen na mikroprocesoru ATmega48, do kterého je nahrán řídicí program. V práci jsou dále zobrazeny výsledky měření dosažené s navrženým skenerem.This thesis deals with possibility use ordinary optical distance sensor as a 3D laser proximity scanner. The thesis is aimed at design mechanical part of scanner for shifting laser beam in two axes. In the scanner is applied indirect shifting of the beam by a mirror. Next is described test control circuit, which has a controlling of direction of beam shifting and data acquisition for task. The control circuit is based on microcontroller ATmega48 with controlling program. On the end of thesis are shown results of measuring reached with designed scanner.

Usage of internet television in sports section (focused on Volleyball club of Technical university in Liberec)

katedra: KTV

Laboratory source based on switching technology

Napln teto bakalarske prace, je popis ruznych topologi, pouzvanych pri konstrukci spnanych zdroju a nasledne vyuzit nabytych znalost k vyberu vhodne topologie, kon- strukci napajecho zdroje pomoc vybrane topologie a nasledne konstrukci laboratornho zdroje jakozto celku. Obsahem ideoveho navrhu tedy je napajeci cast zdroje zalozena na topologii pouzvane prave u spnanych zdroju, dale na regulatoru pracujcm jako snizujc menic rzeny PWM a rdc cast, jejimz hlavnim prvkem je 8-mi bitovy mikroprocesor. Pri navrhu je ukazana prace s navrhovym programem PXLS Expert a programem pro navrh plosnych spoju EAGLE. Simulace ukazane v teto praci jsou provadeny v programu OrCad PSPice. Cl prace spocva v oziven vsech funkcnch bloku jako jeden celek a nasledne nameren zakladnch parametru, ktere jsou zpracovany gracky. Vsechny namerene pa- rametry jsou v zaveru srovnany s parametry ocekavanymi a se simulacemi zskanymi pri ideovem navrhu. Zaverem prace je zhodnocen vsech zjistenych vysledku a porovnan s prvotnmi cli teto prace.The aim of this thesis is a description of the dierent topologies used in switching power supply and subsequent use of acquired knowledge to select an appropriate topology, power supply, using the selected topology and the subsequent construction of laboratory source as a whole. Ideological content of the proposal are part of the power source based on the topology being used in switching power supplies, also on the controller working as buck converter controlled by PWM and the control section, whose mainfeature is the 8-bit microprocessor. The design is shown working with the designprogram PXLS Expert and the program for PCB Design EAGLE. Simulation shown in this thesis are implemented in the program OrCAD PSPice. Objective is to ervive all the functional blocks as a whole and the subsequent measurement of basic parameters, which are pro- cessed graphically. All parameters are measured at the end compared with the expected parameters and the simulations generated in the ideological content. Finally, the work is to evaluate all of the results obtained and compared with the primary objective of this work.

The Study of Software Support of Manufacturing Processes

Diplomová práce „Studie softwarové podpory výrobních procesů“ se zabývá problematikou zavádění konkrétního podnikového informačního systému z pohledu projektového řízení. Hlavním cílem je návrh projektu řešícího implementaci nového integrovaného řídicího systému s použitím produktů IT.Thesis „Study of software support of the production processes deals with the issue of the deployment of a particular enterprise information system from the point of view of the project management. The main aim is to design the project solving the implementation of a new integrated control system with the use of IT products.

Photocatalytic decomposition of nitrous oxide using TiO2 and Ag-TiO2 nanocomposite thin films

TiO2 and Ag-TiO2 (0.05, 0.25 and 1 wt% of Ag) thin films were prepared by the sol–gel method. The prepared films were characterized using SEM-EDAX, XRD, Raman spectroscopy, atomic force microscopy and UV–Vis spectrometry. Photocatalytic decomposition of N2O was performed in an annular batch reactor illuminated with an 8 W Hg lamp (254 nm wavelength). The photoreactivity of Ag-TiO2 increases with the Ag amount to 0.25 wt% Ag. Further increase of Ag loading to 1 wt% Ag did not change N2O conversion. The Ag particles deposited on the TiO2 surface can act as electron–hole separation centers. The presence of water vapor and oxygen in the reaction mixture slightly improved N2O conversion.Web of Science20917517

Photocatalytic and photochemical decomposition of N2O on ZnS-MMT Catalyst

ZnS nanoparticles stabilized by cetyltrimethylammonium bromide were deposited on montmorillonite forming the ZnS-MMT nanocomposite. The nanocomposite was characterized by UV–vis DRS, SEM-EDAX, FTIR, XRD and nitrogen physisorption and tested for N2O photocatalytic decomposition in an annular batch reactor illuminated with an 8 W Hg lamp (254 nm wavelength). Photolysis of N2O was tested at the same conditions. The N2O conversion in inert gas was 79% after 24 h of illumination and was attributed to the simultaneous N2O photocatalytic and photochemical decomposition. The presence of water vapor inhibited photocatalytic reaction pathway while N2O photolysis was improved. Photocatalytic performance was higher with catalyst in fluidized bed than in fixed bed. The reason is that both mass and photon transfer to the photocatalyst was maximized. Better results were obtained with Zn-MMT compared to Evonic P25 catalyst.Web of Science230666