Design of threading head with automatic reversing

Tato bakalářská práce se zabývá konstrukčním návrhem závitořezné hlavy s automatickou reverzací otáček. Práce je členěna na dvě části, první část je věnována přehledu výrobních technologii pro zhotovení zejména vnitřních závitů a rešerše v oblasti závitořezných hlav. Druhá část je věnovaná samotnému konstrukčnímu návrhu závitořezné hlavy včetně potřebných výpočtů.This bachelor’s thesis deals with the design of reversing tapping head. The thesis is divided into two parts. First part is devoted to an overview of technologies for the thread producing focusing to tapping and research in field of tapping heads. Second part contains design of reversing tapping head including the necessary calculations.

Technological Progress in the Implementation ceiling construction of the Apartment Building in Havířov

ŽEBRÁK, David. Technologický postup pro provádění stropních konstrukcí: Bakalářská práce. VŠB – Technická univerzita Ostrava, Fakulta stavební, Katedra pozemního stavitelství, 2020/2021, Vedoucí práce: Ing. Hana Ševčíková, Ph.D. Cílem bakalářské práce je vypracování projektu bytového domu v rozsahu pro stavební povolení a technologického postupu provádění stropních konstrukcí. Bakalářská práce obsahuje technologický postup provádění stropních konstrukcí, časový harmonogram a položkový rozpočet pro tuto část, projekt celého domu.ŽEBRÁK Daivd. Technological progress of Implementation of ceiling structures: Bachelor thesis. VŠB – Technical university of Ostrava, Faculty of Civil Engineering, Department of Builging construction, 2020/2021, Supervisor: Ing. Hana Ševčíková, Ph.D. The aim of the bachelor’s thesis is to develop a project od an apartment buildding in the scope for a building permit and the technological process of implementation of of ceiling structures. The bachelor’s thesis contains the technologicas process of the project od the whole house.225 - Katedra pozemního stavitelstvívelmi dobř

Rotating Gliding Arc: Innovative Source for VOC Remediation

The large-scale plasma treatment of waste gas in industrial or municipal conditions requires high efficiency of plasma conversion process at high processing speed, i.e., large volumetric flow. The integration of the plasma unit into existing systems puts demands on the pipe-system compatibility and minimal pressure drop due to adoption of plasma processing step. These conditions are met at the innovative rotating electrode gliding arc plasma unit described in this article. The system consists of propeller-shaped high voltage electrode inside grounded metallic tube. The design of HV electrode eliminates the pressure drop inside the air system, contrary the plasma unit itself is capable of driving the waste gas at volumetric flow up to 300 m3/hr for 20 cm pipe diameter. In the article the first results on pilot study of waste air treatment will be given for selected volatile organic compounds together with basic characteristic of the plasma unit used

Surface plasmon resonance imaging sensor for detection of photolytically and photocatalytically degraded glyphosate

Glyphosate is one of the most widely used pesticides, which, together with its primary metabolite aminomethylphosphonic acid, remains present in the environment. Many technologies have been developed to reduce glyphosate amounts in water. Among them, heterogeneous photocatalysis with titanium dioxide as a commonly used photocatalyst achieves high removal efficiency. Nevertheless, glyphosate is often converted to organic intermediates during its degradation. The detection of degraded glyphosate and emerging products is, therefore, an important element of research in terms of disposal methods. Attention is being paid to new sensors enabling the fast detection of glyphosate and its degradation products, which would allow the monitoring of its removal process in real time. The surface plasmon resonance imaging (SPRi) method is a promising technique for sensing emerging pollutants in water. The aim of this work was to design, create, and test an SPRi biosensor suitable for the detection of glyphosate during photolytic and photocatalytic experiments focused on its degradation. Cytochrome P450 and TiO2 were selected as the detection molecules. We developed a sensor for the detection of the target molecules with a low molecular weight for monitoring the process of glyphosate degradation, which could be applied in a flow-through arrangement and thus detect changes taking place in real-time. We believe that SPRi sensing could be widely used in the study of xenobiotic removal from surface water or wastewater.Web of Science2223art. no. 921

Innovative technology for ammonia abatement from livestock buildings using advanced oxidation processes

The feasibility of using advanced oxidation processes (AOPs) for abatement of ammonia from livestock buildings was exam ined in a series of pilot plant experiments. In this study, all the experiments were conducted in a two-step unit containing a dry photolytic reactor (UV185/UV254/O3) and a photochemical scrubber (UV254/H2O2). The unit efciency was tested for two initial ammonia concentrations (20 and 35 ppmv) and three diferent air fows (150, 300 and 450 m3 ·h−1). While the frst step removes mainly organic pollutants that are often present together with ammonia in the air and ammonia only partially, the second step removes around 90% of ammonia emissions even at the highest fow rate of 450 m3 ·h−1. Absorbed ammonia in the aqueous phase can be efectively removed without adjusting the pH (i.e. without the addition of other additives) using UV and ozone. Complete removal of ammonia was achieved after 15 h of irradiation. In order to assess the price efciency of the suggested technology and to be able to compare it with other methods the fgures-of-merit were determined. The price needed for lowering ammonia emission by one order of magnitude is 0.002 € per cubic meter of treated air at the highest fow rate of 450 m3 ·h−1 and for initial ammonia concentrations of 20 ppmv. These fndings demonstrate that AOPs are a promising method for ammonia abatement from livestock buildings which are rarely using any waste air treatment method.Web of Science2271610160

Catalytic oxidation of ammonia over cerium-modified copper aluminium zinc mixed oxides

Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 & DEG;C up to 350 & DEG;C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N-2 selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples' surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N-2 sorption, scanning electron microscopy) and sample reducibility analysis (H-2 temperature-programmed reduction).Web of Science1421art. no. 658

Činitelé ovlivňující chod statického uhelného pluhu

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Methodology for solving an BI analytical tasks

The thesis focuses mainly on OLAP technology and its tools using to analyze corporate data. One of the objectives is to define the analytical tools market and provide an overview which shows the current situation concerning those tools on Business Intelligence (BI) market. Another objective is to obtain an overview of some current and future trends in the BI market. The main purpose of the thesis is to create a "methodology" for solving an BI analytical tasks using analytical services in SQL Server 2008 R2 from Microsoft. To achieve these objectives a theoretical analysis of available resources and, in particular consultation with employees of Clever Decision company is used. The main contribution of this work is the development of analytical database itself, which is divided into separate phases where each phase contains best practices and recommendations, including examples

Pluhové dobývání nízkých slojí

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Provozní a ekonomické výsledky pluhů nasazených v OKR

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