Financial Analysis of a Construction Company

Cílem bakalářské práce je na základě teoretických poznatků za pomocí aplikace metod finanční analýzy posoudit finanční zdraví a dosahování stanovených cílů společnosti EUROVIA CS, a.s., v letech 2014 až 2017. Bakalářská práce je rozdělena do dvou hlavních částí. První část práce se zabývá teoretickou stránkou finanční analýzy. V druhé části je na základě teoretických poznatků provedena analýza účetních výkazů společnosti. Z dosažených výsledků finanční analýzy je posouzen stav a zhodnoceno dosažení stanovených cílů společnosti.The aim of the bachelor thesis is based on theoretical knowledge using financial analysis methods to assess financial health and achievement of the goals of EUROVIA CS, a.s., in the years from 2014 to 2017. The bachelor thesis is divided into two main parts. The first part deals with the theoretical aspect of financial analysis. Based on the theoretical knowledge, the second part include the company financial analysis. Evaluation of the company's goals achievement and financial condition is assessed from the financial analysis results.152 - Katedra podnikohospodářskávýborn

The Cause of Mechanical Vibration of Palasher Synchronous Motors and its Removal

The paper describes the procedure and the result of the analysis of mechanical vibrations of mining machines at the Palasher mine in the Russian Federation. The cause of these vibrations was the change in the magnitude of the magnetic flux in the air gap. The simulations showed the possibility of eliminating these changes in magnetic flux by injecting suitable voltages into the stator windings. The implementation of this injection is further described by torque variable component feed-direct compensation. Finally, oscillography records are presented before and after injection

Recognition of stream drying based on benthic macroinvertebrates: a new tool in Central Europe

Many streams in the extensive Central European region have an intermittent flow regime. Conventional hydrological methods used to identify zero-flow conditions, and in particular drying events, have limited use when assessing large areas dominated by low-order streams. We developed a novel multimetric index to recognise antecedent stream drying based on the analysis of benthic macroinvertebrate communities. The data used to develop the index were collected in pristine streams with different flow permanence regimes between 2012 and 2014, using standard sampling methods for ecological status assessment. The data include 64 perennial, 19 near-perennial and 27 intermittent benthic macroinvertebrate samples. Metrics considered for the index included variables based on (i) the occurrence of indicator taxa, (ii) the proportion of biological and ecological traits, and (iii) structural community metrics. Linear discriminant analysis identified the metric combinations that best discriminated among the three flow permanence categories. Different metrics were used in the final multimetric index calculation for the autumn and spring season that followed stream drying. In both seasons, the index included the proportion of indicator taxa and the proportion of taxa with high body flexibility. In addition, the autumn index included the proportion of taxa with a preference for organic substrates, whereas in spring the index included total abundance. Independent data from regulatory monitoring activity were used to validate the accuracy of the index. The correct classification of independent samples was 92% and 96% for samples from perennial and non-perennial sites, respectively. The index can be calculated using data collected by routine monitoring programmes used to assess ecological status and provides information about stream intermittence where conventional hydrological monitoring is limited. As intermittent streams increase in extent in global regions including Central Europe, the tool may be of particular interest to those who use invertebrates to monitor or manage these ecosystems

G2 Project - Software Interface for Actuating Main Drive via Ethercat Network

The software interface for actuating an IM drive using the Ethercat industrial network is described. The IM drive is controlled by the Emadyn F controller, which represents a Slave device in the network and which also involves, in addition to the IM vector control software, software implementation of EtherCAT Slave Controller (ESC)

Stability Analysis of Power Transfer in PF Supply System of Compass-U Tokamak.

Power transfer stability in supply circuits of PF (Poloidal Field) coils has been analysed. Proper energizing of these coils is necessary for COMPASS-U tokamak experiments. The analysis main method is linearization of a non-linear system in a steady-state working point. The steady state-points have been specified by the Institute of Plasma Physics ASCR so that the whole operating area of the tokamak would be involved. At first, a simplified numerical model has been set up and analysed, then the analysis of a complex model of the PF supply system has been carried out in several versions according to the requirements of the contractor

Lowest Level Control for FB-MMC Converter

The analysis and comparison of two basic methods for the lowest level control of the Delta-connected FB-MMC converter (Full Bridge, Modular Multilevel Converter) have been performed. The first method is the SA-PWM modulation (Sampled Average PWM) with cell voltage balancing of SORT-BAL type, where cells are sorted according to their voltages. The other is the PSC-PWM modulation (Phase Shifted Carrier PWM) with FBCK-BAL balancing, which uses feedback P-control of cell capacitors voltages

Balancování napětí na 4-hladinovém napěťovém střídači s plovoucími kondenzátory

This paper deals with voltage balancing, which is a specific problem in multilevel voltage source inverters (VSI). The reasons for choosing a capacitor-clamped VSI for the solution of our project are stated, and the basic principle of such VSIs and the demands on balancing their flying capacitors are explained. A control algorithm for the voltage balancing of a 4-level capacitor-clamped VSI is suggested. The implementation of the balancing algorithm is also discussed. The results obtained from computer simulations in the time domain demonstrate the operating capability of the proposed balancing algorithm in an 850 kW induction motor drive

Control system of APF device

Control method of Active Parallel Filter (APF), which is based on the previously developed AFE control method utilizing the LQR controller, is described. The APF device is able to compensate fully reactive load current and reduce considerably higher harmonics up to 11th order. APF functionality was tested on a physical model of the LV 4-level converter with flying capacitors in steady and transient states for both symmetrical and asymmetrical loads. The control system was implemented into Emadyn-F controller

Control and balancing of 7-level voltage converter with reduced capacitance of three flying capacitors

A method of the control and voltage balancing of a converter using 4-7L topology is described. The 7-level VSI employs flying capacitors, 3 of which have substantially reduced capacitance. Conditions are explained under which the mentioned VSI can be controlled using the 4-level space vector modulation. Three algorithms of capacitor voltage balancing were developed which differ in complexity. All of them were verified by computer simulations. A simple basic variant has been realized in FPGA and tested in a LV 4-7L VSI model