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Innovation of load test stand for electric drives
Martinek, Jan ; Marada, Tomáš (referee) ; Huzlík, Rostislav (advisor)
The theses presented proposes an innovation of load test stand for electric drives. It begins with a general overview of load test stand types, their manufacturers and measurement methods in load and no-load situations. Next part analyses current circuit diagram of the load test stand and its risks. This is followed by a proposal for innovation of the circuit diagram which is divided into electrical and control part using current load test stand and its mechanical parts. A wiring diagram is created, the control part is processed by the Logosoft program. The design is evaluated from the safety point of view and modified to meet applicable technical standards.
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Cogeneration
Martinek, Jan ; Šnajdárek, Ladislav (referee) ; Fortelný, Zdeněk (advisor)
This bachelor thesis is intended to handle the issue of cogeneration. There is presented the principle of cogeneration and its benefits. Cogeneration is compared to the separate production of power and heat. This work deals with the storage of electric energy and heat and also deals with used batteries. The next chapter discusses the impact of cogeneration to environment and at the end there are mentioned the main Brno’s cogeneration units and central heat distribution in Brno.
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Fluid boiler CFB for wood biomass combustion, setam paramters 150 t/h; 9,3 MPa; 530 °C
Martinek, Jan ; Moskalík, Jiří (referee) ; Baláš, Marek (advisor)
This diploma thesis deals with the control calculation of fluid biomass boilers with circulating fluidized bed. The introduction briefly introduced fluidized bed boilers and explained what biomass is. Furthermore there is a stoichiometric calculation of combustion. The calculation of the losses and the efficiency of the boiler is following. Desulphurization is calculated briefly. The main part is devoted to the design and calculation of individual heat exchanging surfaces: superheater P1, superheaters 2 and 3, the wall superheater, the return chamber, hanging tubes, economizer and air heater. At the end is calculated total tolerance boiler. Work is completed with a diagram of temperature of working media and combustion.
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Windlass
Martinek, Jan ; Pokorný, Přemysl (referee) ; Malášek, Jiří (advisor)
Windlass is a lifting device widely used in the building industry for lifting or laying building material or other material. This thesis consists of two parts. The theoretical part focuses on existing solutions of different windlass types and contains also a general overview of windlass producers. This part is also concerned with strength and functional calculations of the device and designs individual components of the device. The other part of this thesis is the construction part which is focused on drawings of the overal equipment assembly, contains the list of components and selected production drawings.
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Sport Centre Brno
Martinek, Jan ; Vostrejž, Dušan (referee) ; Odvárka, Antonín (advisor)
The subject of this master thesis is architectural study of sport center in Brno focused on football stadium for 17,500 spectators. Standard of Stadium comes on category 3 of UEFA, with some elements of the standard Elite category. It is a complex study on the possible development of the site as a sports and relaxation area with a primary sport function in the park. The architectural expression and volume solution of stadium is mainly based on the morphology of sports buildings, form follows function. The organic concept is clearly defined roofing mass on elliptic floor plan which mainly response to layout of the auditorium mainly in horizontal and vertical direction. Enabling quality of vision on the pitch is the basic idea of the concept. The construction follows the morphology of the terrain and longitudinal axis is oriented in a north-south direction with the main tribune to the west. The primary load-bearing structure is frame-storey reinforced concrete frame, covered steel truss construction jacketed with titan-zinc hexagonal templates.
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Measurement of Acoustic Parameters of Building Materials by Pseudorandom Sequence
Carbol, Ladislav ; Semerák,, Petr (referee) ; Koktavý, Bohumil (referee) ; Vydra,, Vítězslav (referee) ; Martinek, Jan (advisor)
The thesis deals with research of pulse compression of the acoustic signal in terms of applications in civil engineering. Based on the study and analysis of these methods, automated measuring equipment for non-destructive testing with pseudorandom sequence of maximum length and automated signal analysis, have been designed and implemented. In a single test cycle are obtained three parameters that characterize the linear and nonlinear behavior of the sample. A nonlinear parameter, Time of Flight of ultrasonic wave in the sample is further in the work compared with the conventional pulse measuring, and spectral analysis is compared with the method impact-echo. Functionality and optimization of the testing method was performed on a total of three sets of test pieces made of various building materials. The experiments proved simple result interpretation, and high sensitivity to structural damage associated with temperature loading. The results were correlated with conventional nondestructive methods and by destructive testing was measured change in compressive strength and flexural strength. This work also includes continual measurement of fundamental frequency influenced by moisture on a mortar sample. Use of pulse compression signal is in the civil engineering quite unusual. Only in recent years this topic is discussed in scientific articles with increasing frequency. Great potential lies in the association of three test methods into a single. Beneficial is high test speed and measurement reproducibility, but also theoretical possibility of testing massive test elements.
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Funding of Political Parties: An International comparison
Martinek, Jan ; Antoš, Marek (advisor) ; Jirásková, Věra (referee)
The aim of this thesis is to compare the current legal regulations of political party funding across selected EU countries and to formulate de lege ferenda proposals, based on the "good practice" in these countries, for the construction of state contributions and for the regulation of private financing of political parties in the Czech Republic. The author first presents the basic problems related to public and private financing of political parties. He describes how the financing of political parties has changed over time, what are the advantages and disadvantages of private and public financing, what principles govern both approaches to financing, and how to find a balance between them. While private funding has existed in various forms for as long as political parties, the origins of public funding in Europe date back to the 1950s. The share of public funding in political parties' income has gradually increased, which has reduced many of the problems associated with private funding, and often contributed to more equal electoral chances, but on the other hand, new problems have emerged, in theory associated, for example, with the concept of the cartel party. In the second part of the thesis, the author compares the current legal regulation of public and private financing of political parties in...
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Gastroparesis - pathophysiology, etiopathogenesis and possibilities of endoscopic treatment
Husťak, Rastislav ; Martínek, Jan (advisor) ; Bureš, Jan (referee) ; Urban, Ondřej (referee)
Background: Gastroparesis (GP) is a disorder characterized by delayed gastric emptying in the absence of a symptomatic mechanical obstruction of the stomach with cardinal symptoms. Two principal pathophysiological mechanisms are believed to be responsible for development of GP: global gastric hypomotility and pylorospasm. As pylorospasm may play an important role in GP, the efficacy of treatment modalities targeting the pylorus, such as gastric peroral endoscopic pyloromyotomy (G-POEM), is currently being intensively studied, as these methods have the potential to help especially patients with severe symptoms for whom other treatment measures are ineffective. The aims of our studies were: (1) to evaluate clinical efficacy of G-POEM in the treatment of patients with severe GP; (2) to evaluate the changes in objective periprocedural parameters measured by gastric emptying study (GES) and functional planimetry; (3) to evaluate safety of G-POEM and (4) to compare the efficacy of two closure methods used to close the mucosal incision in G-POEM: clips and endoscopic suturing (ES). Patients and methods: Patients older > 18y, with gastroparesis cardinal symptoms index (GCSI) > 2.3 and abnormal GES were eligible for inclusion. All projects had been performed between 2015 and 2021. Project (1): Clinical efficacy of...
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Early esophageal neoplasia: etiology, pathophysiology, pathogenesis and treatment. Barrett's esophagus and early esophageal adenocarcinoma
Krajčíová, Jana ; Martínek, Jan (advisor) ; Dolina, Jiří (referee) ; Bureš, Jan (referee)
Background: Barrett's esophagus (BE) is a premalignant condition defined by replacement of normal esophageal squamous-cell epithelium by cylindrical epithelium with intestinal metaplasia (IM). Patients with BE associated neoplasia (BORN) are candidates for endoscopic treatment. The aims of our studies were: (1) analysis of long-term efficacy of radiofrequency ablation (RFA) and evaluation of risk factors for persistent/ recurrent neoplasia/ IM; (2) to assess the results and safety of confocal laser endomicroscopy (CLE) compared to standard biopsies in patients after successful endoscopic treatment of BORN; (3) to assess the sampling quality obtained by different types of forceps; and (4) to assess "de novo" reflux after peroral endoscopic myotomy (POEM) and its severity (the risk of development of further complications). Patients and methods: We performed a total of 4 studies. (1) In a retrospective RFA study we evaluated data of 136 patients treated endoscopically for BORN in 4 centers in the Czech Republic. (2) In a prospective, pathologist-blinded, CLE study, we evaluated concordance in the detection of IM or neoplasia with CLE compared to standard biopsies in 56 patients who underwent standard surveillance endoscopy. (3) In a prospective study comparing 4 types of forceps, we evaluated the...
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Immunohistochemical and molecular-genetic markers in predicting the progression of esophageal neoplasia in correlation with pathophysiology
Kollár, Marek ; Martínek, Jan (advisor) ; Suchánek, Štěpán (referee) ; Mandys, Václav (referee)
Introduction: Esophageal cancer ranks eighth among the most common malignancies worldwide. The two most common types are adenocarcinoma and spinocellular carcinoma. Correct histopathological diagnosis, cancer staging and identification of predictive risk factors of progression are important in terms of further disease course and management. While patients with mucosal carcinoma without risk factors are treated endoscopically, those with submucosal invasion or mucosal carcinoma with risk factors are referred for surgical therapy according to current recommendations. Histopathology is still considered the gold standard in diagnosis, often used in conjunction with immunohistochemistry, e.g., to document a TP53 gene mutation, which plays an important role in the pathogenesis and progression of esophageal dysplasia. New diagnostic methods, such as confocal laser endomicroscopy (CLE), also play an important role. Other crucial factors include patient follow-up, early and reliable detection of persistent or recurrent lesions. Aims, methods and patients: In the thesis, 4 separate, partly connected projects are assessed together, with a partial overlap of patients. The aims of the individual projects were as follows: 1) To identify predictive factors of esophageal cancer progression, risk of metastasis and...
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