National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
Vliv pozice v kmeni a stanoviště na přirozenou trvanlivost dřeva douglasky tisolisté (Pseudotsuga menziesii)
Dobrovolný, Jakub
This thesis deals with a finding off a relationship between natural durability of Douglas fir wood against wood decaying fungi (Serpula lacrymans and Fibroporia vaillantii) and its habitat growth and position in the trunk. Durability of wood was determined as a percentage of mass loss compared to the original sample. The theoretical part describes all the problems related to this topic. In second part, the measured values are statistically evaluated and compared with literature.
Switching of modern LED light sources
Dobrovolný, Jakub ; Fencl, Jiří (referee) ; Dostál, Lukáš (advisor)
The protection of the electrical device is provided to prevent the electric shocks, protect the equipment and prevent a damage caused by electrical faults. The current protection for a small fault currents need not always have an effect. At the serious faults the current protections never work. The new type of device to protect against damage caused by electrical failure is an arc protection. The arc protection switches off safely all types of fault arc in different sizes. This work verifies its correct functionality in the case of electric circuit with deceptive signals from LED light sources. The output of the work is the measurement of the switching current of the LED light sources. The work is remarkable thanks the number of measurement for individual angles of switching on which have statistical meaning.
Derating on the low voltage devices with a thermal trip unit
Dobrovolný, Jakub ; Vetiška, Vojtěch (referee) ; Dostál, Lukáš (advisor)
Electrical devices are secured as not to injure living creatures via electric current and damage or destroy machinery due to the effects of electric current. Circuit breaker is a device responsible for protection of an electrical circuit against damage. The main aim of thesis is the correct function of the thermal trip unit when it exposes to the thermal warming. The thermal trip unit is depended on heating of a bimetal before overcurrent flow. The goal of thesis is temperature and voltage drop profile from measured values. Verification of the measurement is done in SolidWorks Flow Simulation software. According to simulations are determined currents for correct function of the thermal trip unit in different temperatures of an environment. The most important result of the thesis is correct setting of the operating current in the circuit breaker.
Choice of IS/ICT for Cultural Club with Restaurant
Špaček, Ondřej ; Dobrovolný, Jakub (referee) ; Dvořák, Jiří (advisor)
There are an analysis of main business processes, inner and outer spheres of business where IS/ICT could be a merit in the thesis. Suitable information and communication technologies are chosen to support running a company which deals with cultural events organizing and restaurant activities.
Vztah mezi trvanlivostí jádrového dřeva akátu (Robinia pseudoacacia) a jeho přirozenou barvou
Dobrovolný, Jakub
This bachelor thesis deals with a finding off a relationship between the durability of acacia heartwood against wood decaying fungi varicoloured bracket (Trametes versicolor) and its natural color. Durability of wood was determined as a percentage of body weight loss compared to the original sample. It has been analyzed a dependence of the natural color of the acacia wood and a share of extractive substances that have a main influence to durability of wood. The theoretical part describes all the problems related to this topic. In second part, the measured values are processed statistically evaluated and compared with literature.

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6 Dobrovolný, Jan
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