National Repository of Grey Literature 178 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Biogas cleaning to substitute natural gas quality
Němec, Jan ; Niesner, Jakub (referee) ; Dvořák, Radek (advisor)
This work deals with methods of biogas cleaning to natural gas quality for further use. The introduction is focused on technologies for biogas treatment and biogas management for current situation in the Czech Republic. In the main chapter there is a water scrubber technology design and calculation of the absorption column for the conditions given. A simulation model and preliminary economic balance were then developed on the obtained data.
Microgenerator
Pospíšil, Kamil ; Němec, Jan (referee) ; Ondrůšek, Čestmír (advisor)
In this master’s thesis gives an overview of the finite element method (FEM) as used in electrotechnical practice. It deals with calculations of electric and magnetic fields. The task can be solved using ANSYS, FemLab, Femm, Quickfield and next software. Femm is the one I have chosen. The programs are described here, and their use is demostrated on examples. The outcome of the project is a calculation of magnetic field of a microgenerator in a stationary and dynamic field.
Design of Electric Machine Yoke Database
Suchomel, Michal ; Němec, Jan (referee) ; Dydowicz, Petr (advisor)
This bachelor´s thesis deals with the project for building electric machine yoke database with text output to the modeling program for touched subject. Database work based of concrete needs in the copany. Includes respective structure database and their creation in Microsoft Access.
Belt conveyor for transport of building chippings
Němec, Jan ; Škopán, Miroslav (referee) ; Malášek, Jiří (advisor)
The aim of this bachelor thesiswith theme the belt conveyer is to propose a functional conception of an inclined belt conveyer for transport of building crushed material up to the axial distance of 48 meters and with superelevation of 6 meters. The required out put is 170 tonnes pro hour. This work contains functional calculation according to the norm ČSN ISO 5048 and determination of main proportions of the belt conveyer, proposal of conveyer traction, strenght calculation of driven shift.
Effectiveness of evolutionary algorithms
Němec, Jan ; Mlýnek, Petr (referee) ; Fujdiak, Radek (advisor)
This master's thesis is focused on evolutionary algorithms. The goal of this thesis is to chooche a proper algorithm which will solve a chosen problem. In this case the chosen algorithm is the genetic algorithm and the chosen problem is the travelling salesman problem. The result of this thesis will be implementation of the algorithm, finding the proper setup and lastly the measurment of the results for various input data.
Design of asphalt concrete mixture and determinantion of the resistance against permanent deformation
Němec, Jan ; Matoušek, David (referee) ; Varaus, Michal (advisor)
This bachelor thesis deals with the problem regarding asphalt concrete mixtures, concretely ACO 11+. This type of mixture has low resistance to permanent deformation (rutting) while high temperatures are present. The binder and aggregate tests regarding physical and mechanical properties were carried out. Subsequently the new mixture was designed on the basis of stricter requirement for grading envelope and air void content. The design mixture was tested for resistance to permanent deformation. From the obtained results the change in the national annex of the standard ČSN EN 13108-1 is considered in terms of change in testing temperature for some kinds of binders. The same tests were conducted in others asphalt laboratories in the Czech Republic to ensure the maximum comparability.
Modification of work conditions ALIMAK - SCANDO machine
Němec, Jan ; Otradovec, Jan (referee) ; Pokorný, Přemysl (advisor)
The theme of this master´s thesis with theme the modification of work conditions, it´s aim is to analyse existing and modified operating conditions of the machine and make their comparison. This work includes frame stress analysis, surface burdened by wind, the stability of the location and control of capacity at endurance.
Social-based Forwarding in IP Networks
Němec, Jan ; Balej, Jiří (referee) ; Hošek, Jiří (advisor)
This barchelor thehis focuses on problematics of data routing in mobile networks. First part of the work focuses on mobile networks and description of DTN and opportunistic networks. In next part of this work are described routing protocols which fits the concept of routing based on social status. Last part of the work focuses on design and realization of the chosen protocol from the previous part.
Design of supply network configuration for large engineering company
Němec, Jan ; Holoubek, Jiří (referee) ; Topolánek, David (advisor)
This master-thesis analyzes issues of suggestion configuration of power supply network of industrial business. The option of the scheme of the configuration, the voltage level, the way of compensation of the reactive power, the way of the suppretion of the energetic interference and other requirements is included in the main tasks. This option has to be convenient with the requirements of the industrial business. The important point of this proposal is to prevent the influence of the superordinate distribution network. The compensation which keeps the power factor in the prescribed limits is one of the precautions against the influencing of the network. The second precaution is the elimination of energetic interference. The higher voltage, the fluctuation and the asymmetry of the voltage are the interferences which have the biggest impact on the industrial networks. The master-thesis offers the summary of the possibilities and ways of the elimination of the basic elements of the energetic interference.
Evaluation of Possibility of New Source Connection With Regard to Nodal Voltage
Němec, Jan ; Topolánek, David (referee) ; Toman, Petr (advisor)
Connection new source of electrical energy into distribution network is important for existing one for reasons its rating and dimensioning. It is even evaluate, whether possibility connection new source in to network is real and do not endanger continuous running distribution system. This work has shown, what conditions are need realize for connection source into distribution network in view of voltage ratio. Next it must incidence harmonic current and affecting centralized telecontrol signal about reasoning. Against a background examination connection source are administrative acts, which forms basis of successful connection. On basis lets request of connection mostly study of connection working up. This study contains concrete calculation and examination individual factors for connection new source. Next put mind to connection wind power station, because wind power stations are very special source for connection into distribution network. Bigger demands are putting on them and stricter examination of connection to site must be done. Because during time unit (day, week and month) they have various strain diagram. Which makes higher straining of distribution and necessity have reserve of electrical energy for case fail wind power station owing to windless ness. In the end, there is referred to practical examination example of possibility connecting. As this example was chosen examination of wind park to 110 kW network with 32 MVA installed power from view of voltage ratio. Solution process is given by replacement of part of given Picells link and by calculation steady state of node site system with Gauss-Seidels iteration method. After that follows evaluation of voltage change in the site before and after connection of source to the network, which can not be higher than 2%. In this example is this condition satisfied and from a view of voltage ratio there is nothing to obstruct for connection new source to network.

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