National Repository of Grey Literature 78 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Design of single-purpose cutting machine for shortening of plant stems
Žižka, Jakub ; Brandejs, Jan (referee) ; Vespalec, Arnošt (advisor)
This bachelor thesis deals with the design of a single-purpose machine for cutting plant stems. The task of the machine is to cut already partially shortened and stripped wheat straw stalks to the required length. The operation of the machine is fully automated, the operator only ensures the supply of semi-finished products to the machine, removes the finished stalks and controls the operation of the machine. In the thesis is a search describing the existing technologies used for cutting plant stalks, the possibility of driving a single-purpose machine and possible solutions for transporting stalks. The research also includes an analysis of the necessary mechanical and physical properties of wheat stalks. Subsequently, the analysis of information from the research part of the thesis and the definition of important parameters for the design construction balance sheet is performed. In the practical part of the work are developed concepts of possible solutions of individual structural nodes and justification of the choice of individual solutions. The second part of the practical part deals with the construction design of a selected conceptual design, including calculations. The work shows a possible solution for the construction of a machine for processing semi-finished products with a large variety of shapes.
Pallet truck
Paulíček, Jiří ; Křupka, Jiří (referee) ; Brandejs, Jan (advisor)
The aim of this bachelor thesis is to design a pallet truck, equipped by mechanism which allows the truck to be loaded into van. Truck is designed for manual-hydraulic drive of forks and for load of 1000kg. The basic types of pallet trucks are described in the research part. There is also described Innolift, which is only one with the self-loading mechanism. The main construction nodes are solved in the design part including strength calculations
The front axle of the three-wheel hobby vehicle
Mlynár, Adam ; Brandejs, Jan (referee) ; Mazůrek, Ivan (advisor)
This bachelor's thesis deals with design of front double wishbone suspension adaptable to reverse trike vehicle. The first chapter is devoted to the overview of three-wheel vehicles, the basic geometrical parameters of the axles and the introduction of the modified vehicle. The next chapter contains a suggestion of suitable geometry and kinematics of the axle and is inspected in program Lotus Suspension Analysis. The conclusion is devoted to conceptual design and structural design in program SolidWorks 2016. A suitable stiffness of the suspension is also proposed, and the factor of safety of the arms and the steering knuckle is checked by finite element analysis.
Engineering design of the hydraulic press for bearings for bikes
Vichr, Tomáš ; Brandejs, Jan (referee) ; Klapka, Milan (advisor)
This bachelor thesis concerns design of a bearing replacement device in the motorcycles wheels. The aim was to develop an affordable and reliable home appliance. In general research are defined the imperfections of commonly available devices on the market. Based on that are designed three conceptual proposals as a solution of these problems. The most suitable one is chosen and the critical crucial points are verified as well as the production price.
Mechanical design of 3D printer head for manufacturing of concrete parts
Slavíček, Jakub ; Brandejs, Jan (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with a structural design of modular printer head used for 3D print of cementitious mixture. Printer head is designed for continuous printing of cementitous mixture with added crushed stone and accelerator. The main function of printer head is extrusion of the final mixture with established print parametres. In the thesis, the research was conducted into existing 3D concrete printing methods, possibilities of concrete transportation and material characteristics. The analysis is carried out in the second chapter, where the knowledge from the first chapter is evaluated and factors influencing the extrusion of concrete are defined. The design part of thesis specifies basic printing parametres and contains different alternatives of solution. The chosen conceptual solution is elaborated in detail and construction solution includes verifying calculations.
Mechanical design of plastic parts crusher
Šebesta, Karel ; Brandejs, Jan (referee) ; Paloušek, David (advisor)
The thesis focuses on the construction of shredder of plastic components produced by 3D printers. The aim of the thesis is to design a shredder whose output components, the so-called flakes, could be used to produce recycled filament. The first part of the thesis covers an analysis of technology of shredding. Furthermore, the properties of shredded material and the requirements for the quality of output granules are determined. Based on the research, the parameters for the efficient shredder are defined. In accordance with these parameters, several variants are created, from which the final design of the two-stage shredder is selected and constructed.
Horizontal grill
Horák, Vojtěch ; Krčma, Martin (referee) ; Brandejs, Jan (advisor)
This barchelor's thesis deals with the construction of a homemade horizontal piglet grill with an electric propulsion. The grill is designed for solid fuel in the form of timber or charcoal. It is proportioned for 50kg. The research part consists of a description of the main types of grills and their advantages and disadvantages. The constructive part deals with the solution of the constructional problemes, documented by calculations. This construction is considered to be made with lowest expenses. Part of this work is also a continuous photodocumentation, which captures the whole process of the construction progress. At the end of the thesis there is the estimation of production costs.
Crane blocks
Musil, Adam ; Vaverka, Ondřej (referee) ; Brandejs, Jan (advisor)
This thesis is focused on the design of crane blocks for a bridge crane of maximum load of 65 tons. It includes design proposal of the rope, pulley, pulley axle and bearings. Furthermore it contains strength calculations of aforementioned. Last chapter provides assembly drawing, production drawing and bill of material.
Optimizing quantum simulations and the DMRG method
Brandejs, Jan ; Pittner, Jiří (advisor) ; Zamastil, Jaroslav (referee)
Title: Optimizing quantum simulations and the DMRG method Author: Jan Brandejs Department: Department of Chemical Physics and Optics Supervisor: doc. Dr. rer. nat. Jiří Pittner, DSc., J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences Abstract: In this work, we explore the quantum information theoretical aspects of simulation of quantum systems on classical computers, in particular the many- electron strongly correlated wave functions. We describe a way how to reduce the amount of data required for storing the wavefunction by a lossy compression of quantum information. For this purpose, we describe the measures of quantum entanglement for the density matrix renormalization group method. We imple- ment the computation of multi-site generalization of mutual information within the DMRG method and investigate entanglement patterns of strongly correlated chemical systems. We present several ways how to optimize the ground state calculation in the DMRG method. The theoretical conclusions are supported by numerical simulations of the diborane molecule, exhibiting chemically interest- ing electronic structure, like the 3-centered 2-electron bonds. In the theoretical part, we give a brief introduction to the principles of the DMRG method. Then we explain the quantum informational...
The Idea of the State and Imperial Rule in the Byzantine and Western Empire in the 9th to 11th Centuries
Brandejs, Jan ; Picková, Dana (advisor) ; Drška, Václav (referee)
The present thesis aims to conclude an analysis of political and administative structures in Byzantium and Western Empire from the end of the 9th until half of the 11th century. This was achieved by means of comparison. The author attempted resolve the issue of mutual relationship between the political elite and the ruler and how differences both in the Byzantine and Western Empires influenced the social system. The research included analysis of ruler legitimity, organisation of administration, social mentality and abstract ideas of the state. In the conclusion of this work, the author presented the major differences between West and Byzantium and evaluated future development of both states in regard to internal stability and integration fo political elites. Keywords: Byzantine Empire, East Francia, Roman Empire, Idea of the State

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