User-Friendly Animated Communication with OLAP System

Komplikovanost modelů vícedimenzionálních dat a práce s nimi nikterak nezlepšuje kvalitu uživatelské přívětivosti aplikace s nimi pracující. Jednou z možností jak vyřešit zmírnění negativního vlivu této skutečnosti na laického uživatele je použití vizualizačních technik pro vylepšení uživatelského rozhraní systému. V současnosti existují mocné nástroje využitelné pro efektivní manipulaci původně statického dokumentu na straně klienta. Jejich využitím lze obohatit rozhraní systému interaktivní nápovědou. Použitelnost takto definovaného modulu musí odpovídat podmínkám maximální přenositelnosti. Důležitým aspektem je rovněž rozsah a provedení konfigurovatelnosti výsledku praktické části práce.Complexity of multidimensional data models and its usage does not have positive influence on quality of user-friendliness of application working with them. The option of solution of negative influence of this fact on laic end-user is usage of visualisation technics for upgrade of user interface of the system. Nowadays there are powerful tools usable for impressive manipulation of originally static document on the client side. By using them, interface of the system can be enhanced with an interactive help. Usability of this modul has to satisfy maximal portability requirements. Important aspect is also range and methods of configurability of result of practical part of thesis.

Studies on Aged Polyethylene Samples

Degradation of polyethylene sheets simulated through artifical accelerated weathering has been examinated in this report by using several methods

Inovace organizačního uspořádání střediska dopravy a mechanizace Ingstav Ostrava, a.s.

Import 20/04/2006Prezenční výpůjčkaVŠB - Technická univerzita Ostrava. Fakulta metalurgie a materiálového inženýrství. Katedra (634) ekonomiky a managementu v metalurgi

Multidimensional Data in OLAP System

Thesis considers the problems of multidimensional data in OLAP systems, especially its visualization at 2D computer screen. Briefly it describes the way how the data are stored in multidimensional database and formal description of hypercube structure. Next chapter contains very detailed classification of diagrams including the facts about its usability for visualization of multidimensional data and for official presentations where the high synopticity is required. Last chapter is description of single stages in development of information system interface for multidimensional data visualization

Ball milling: A top down facile approach to synthesize AgInSe2 nanostructures

A quantum dot solar cell is an emerging field in solar cell research that uses quantum dots as the photovoltaic material. Quantum dots have band gaps that are tunable across a wide range of energy levels by changing the quantum dot size. The embedment of different sized dots within absorbing layer encourages harnessing of the maximum spectrum energy. Also other effects like very high surface to volume ratio, Quantum Transport make them attractive for future devices. For an attempt of AIS quantum dots (QDs), AIS nanoparticles with tetragonally distorted phase were prepared by mechanically alloying the synthesized bulk AIS powder at room temperature in a planetary ball mill under Ar. Nanoparticles are formed with range -10 nm in size. These ball-milled nanoparticles contain different shapes, and the Rietveld analysis of X-ray powder diffraction data reveals their detailed structural features. High resolution transmission electron microscope (HRTEM) images also detect the presence of the tetragonal phase in ball-milled samples. Peak Broadening (FWHM), which is the main characteristics of decrease in size, is observed. XRD data reveals the downscaling of crystallite from 103 nm to 7 nm, also tetragonally distorted structure of the system was not disturbed by milling. The DSC study also reveals the phase evolution and crystallization kinetics. Bulk samples show endo melting peak at 134 °C and 220 °C. Cooling-crystallization complexity of the peak/peaks signifies crystallization from melt was heterogeneous nucleation and crystallization from multiple types of centers. Unlike this, milled samples show two crystallization effects at approx. 135 °C and 380 °C. Optical properties were investigated to find band edges, and suggest it around 1.3 eV which is encouraging for photovoltaic applications

Platinum Nanoparticles Immobilized on Electrospun Membranes for Catalytic Oxidation of Volatile Organic Compounds

Structured catalytic membranes with high porosity and a low pressure drop are particularly suitable for industrial processes carried out at high space velocities. One of these processes is the catalytic total oxidation of volatile organic compounds, which is an economically feasible and environmentally friendly way of emission abatement. Noble metal catalysts are typically preferred due to high activity and stability. In this paper, the preparation of a thermally stable polybenzimidazole electrospun membrane, which can be used as a support for a platinum catalyst applicable in the total oxidation of volatile organic compounds, is reported for the first time. In contrast to commercial pelletized catalysts, high porosity of the membrane allowed for easy accessibility of the platinum active sites to the reactants and the catalytic bed exhibited a low pressure drop. We have shown that the preparation conditions can be tuned in order to obtain catalysts with a desired platinum particle size. In the gas-phase oxidation of ethanol, acetone, and toluene, the catalysts with Pt particle sizes 2.1 nm and 26 nm exhibited a lower catalytic activity than that with a Pt particle size of 12 nm. Catalysts with a Pt particle size of 2.1 nm and 12 nm were prepared by equilibrium adsorption, and the higher catalytic activity of the latter catalyst was ascribed to more reactive adsorbed oxygen species on larger Pt nanoparticles. On the other hand, the catalyst with a Pt particle size of 26 nm was prepared by a solvent evaporation method and contained less active polycrystalline platinum. Last but not least, the catalyst containing only 0.08 wt.% of platinum achieved high conversion (90%) of all the model volatile organic compounds at moderate temperatures (lower than 335 °C), which is important for reducing the costs of the abatement technology

Enhancement of stability and reactivity of nanosized zero-valent iron with polyhydroxybutyrate

Polyhydroxybutyrate (PHB) is a bacterial storage polyester, which is produced directly in the activated sludge process. In the present study, PHB was tested as a scaffold material for stabilization of nanosized zero-valent iron (nZVI). The morphology of the resulting composite was assessed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX) analysis. In addition, the surface chemistry and particle stabilities of nZVI and nZVI/PHB were determined with zeta potential analysis and disc centrifuge measurements, respectively. Moreover, the sedimentation rate of bare nZVI was tested and compared with that for nZVI/PHB. Batch experiments further confirmed that nZVI/PHB particles are not only more stable but also more reactive toward perchloroethene (PCE) and Cr(VI) in comparison with the bare nZVI. These results suggest that PHB can be developed as an inexpensive and environmentally friendly material for the stabilization of nZVI particles. © 2017 Desalination Publications. All rights reserved