National Repository of Grey Literature 12 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Determination of permeability of ulra-fine lead oxide aerosols through military filters
Kellnerova, E. ; Večeřa, Zbyněk ; Kellner, J. ; Zeman, T. ; Hylak, Č.
Military filters introduced in the Army of the Czech Republic are most commonly used when working with combat equipment and weapons and in manoeuvring activities in the terrain with the use of explosives or chemical warfare agents. During such activities, a large number of pollutants in the form of nanoparticles are released. Nanoparticles, irrespective of their chemical composition, are classified as carcinogenic to humans and therefore it is necessary to eliminate them from the air. Military filters, especially the combined ones, which contain a filtration as well as sorption component, are most widely used and are designed for the widest range of pollutants. However, the current methodology to evaluate the effectiveness of military filters does not fix a duty to monitor the ability of the filters to capture relevant pollutants across the whole range of sizes. The paper evaluates the efficiency of selected types of military filters using the methodology and instrumentation introduced in the accredited laboratories of the Institute of Analytical Chemistry of the Academy of Sciences of the Czech Republic. The testing has been carried out simultaneously with two concentrations of ultra-fine aerosols containing lead oxide nanoparticles ranging in size from 7.6 nm to 299.6 nm. It is an aerosol, the physicochemical and toxicological properties of which are known. During the work the basic parameters of permeability of aerosols tested by filters have been evaluated, especially: size and number of particles in front of and behind the filter, the efficiency and penetration of nanoparticles by the filter.
Návrh vytápění rodinného domu
Zeman, Tomáš
This diploma thesis deals with architectural design of a family house, including its main constructions and assessment of selected details. Two main alternatives are presented: recommended value of a standard heat transfer coefficient and recommended value for passive houses. The work continues with determination of heat loss of the entire object, including calculation of thermal bridges effect. According to the calculated heat loss, there are several kinds of heating proposed. Namely: firewood, natural gas, brown coal, black coal, heat pump and electricity. The thesis also includes building envelope energy labels for both alternatives. The proposed family house is designed as a wooden structure with an emphasis on low heat loss.
Use of mathematical knowledge in chemical calculations
Schwarzbacher Zeman, Tomáš ; Novotná, Jarmila (advisor) ; Mošna, František (referee)
A basic summary of the most common types of chemical calculations for primary and high schools and their connection with the mathematical knowledge is mapped in this work. The work is divided into three main parts - the chemical calculations at primary schools, part of chemical calculations at high schools and part mapping tasks that contain chemical calculations in chemical competitions for pupils of primary and high schools. The first two parts contain the necessary theory in mathematics and chemistry, including chemical formulas which are used. The first two parts also contain a few typical examples for better understanding of the topic. The last part shows the application of knowledge of chemical calculations in competitions for pupils.
Destination of tourism: Sweden
Zeman, Tomáš ; Heřman, Jan (referee) ; Navrátilová, Miroslava (advisor)
Název: Destinace cestovního ruchu: Švédsko Title: Destination of tourism: Sweden Souhrn: Cílem této diplomové práce je charakterizovat Švédsko jako destinaci cestovního ruchu. Práce se zaměřuje na popis Švédska z mnoha úhlů pohledu a následné vypracování SWOT analýzy, která by nastínila aspekty, jež jsou typické a zásadní pro tuto destinaci. Součástí práce je také souhrnný přehled zájezdů do této skandinávské země, které jsou nabízeny českými cestovními kancelářemi. V práci jsou navrženy kalkulace dvou vlastních zájezdů. Summary: The goal of this diploma paper is to charakterize Sweden as a destination of tourism. The paper is focused on describing Sweden from different angles and afterwards creating SWOT analysis that provides specific and fundamental aspects of this destination. The paper also contains summarized syllabus of tours head for this Scandinavian country that are being offered by Czech travel agencies. The paper includes draft propositions of two own tours calculations. Klíčová slova: Švédsko, cestovní ruch, destinace, cestovní kancelář, zájezd, pobyt, účastník, SWOT analýza Key Words: Sweden, tourism,destination, travel agency, tour, visit, excursionist, SWOT analysis
Analysis of Selected Indicators of the MERLIN-PLUS spol. s r.o. Company Using Time Series
Zeman, Tomáš ; Mynarčík, Zdeněk (referee) ; Kropáč, Jiří (advisor)
The bachelor´s thesis concentrates on analysis of selected indexes of the company MERLIN-PLUS spol. s r.o. with the help of time series. The theoretical part is focused on characteristics of statistical methods, which are used in the practical part. The results, if it´s possible, are used to make a prediction of the development in the future or to make suggestions and precautions.
Analysis of Company by Selective Methods
Zeman, Tomáš ; Němcová, Zuzana (referee) ; Hanušová, Helena (advisor)
This thesis is focused on the analysis by means of appropriate analytical methods. The theoretical part defines the content of the concepts and describes selected methods for its measurement and evaluation of factors placed upon it. The practical part applies the selected method for enterprise DSB EURO ltd. In conclusion summarizes the lessons learned and proposed measures for the future development of the company.
Assessing the Financial Situation of a Company Using Time Series Analysis
Zeman, Tomáš ; Mynarčík, Zdeněk (referee) ; Doubravský, Karel (advisor)
The diploma thesis deals with assessing financial situation of the company MERLINPLUS spol. s r.o. The thesis includes indexes of financial analysis which are expressed by using time series. If the time series has a specific development trend, the data are aligned with the help of regression analysis and a prediction is set for the following two periods.
Application of lean management in selected company
Zeman, Tomáš ; Zelená, Veronika (advisor) ; Krejčová, Iva (referee)
Abstract: The bachelor thesis is about approaches of lean management in operational ma-nagement. This way of thinking is based on Japanese methods of lean management and continuous improvement kaizen. These methods aim to eliminate all types of wasteing, shorten lead time and increase quality of output. The bachelor thesis is divided into two parts. In the theoretical part will be described theoretical knowledge and practical part, which will include direct practical solutions to problems in selected company.
Influence of inhaled manganese oxides nanoparticles on mass of internal organs in mice
Zeman, T. ; Dočekal, Bohumil ; Mikuška, Pavel ; Buchtová, Marcela ; Míšek, Ivan ; Šerý, Omar ; Večeřa, Zbyněk
Results of the statistical analysis of a long-term inhalation experiment on laboratory mice are presented. During 17 weeks of the experiment, the experimental group was exposed to inhaled manganese oxides nanoparticles. Manganese oxides (MnO center dot Mn2O3) nanoparticles (MnONPs) were synthesized continuously via aerosol route in a hot wall tube flow reactor using a thermal decomposition of metal organic precursor manganese(II) acetylacetonate in the flow tube reactor (in vertical position) at temperature 750 degrees C in the presence of 30 vol% of oxygen. The concentration of produced MnONPs at the reactor output was in the range 1-3 x 10(7) particles/cm(3) and the size of generated nanoparticles MnO center dot Mn2O3 was in the range 7-50 nm. Before entering the inhalation chamber, MnONPs in the mixture of N-2, O-2 and air (at total flow rate of 3 L/min) were further diluted using filtrated humidified air (20 L/min) at temperature 21 degrees C resulting in the MnONPs concentration 2 x 10(6) particles/cm(3). At regular time intervals the mass of selected internal organs of mice from both experimental and control group was assessed. It has been proven that inhaled nanoparticles are able to influence the mass of internal organs of mice. Statistically significantly lower mass of kidneys, liver and spleen and higher mass of pancreas have been found in the experimental group compared to the control group.
Influence of inhaled manganese oxides nanoparticles on mass of internal organs in mice
Zeman, T. ; Dočekal, Bohumil ; Mikuška, Pavel ; Buchtová, Marcela ; Míšek, Ivan ; Šerý, Omar ; Večeřa, Zbyněk
Results of the statistical analysis of a long-term inhalation experiment on laboratory mice are presented. During 17 weeks of the experiment, the experimental group was exposed to inhaled manganese oxides nanoparticles. Manganese oxides (MnO.Mn2O3) nanoparticles (MnONPs) were synthesized continuously via aerosol route in a hot wall tube flow reactor using a thermal decomposition of metal organic precursor manganese(II)acetylacetonate in the flow tube reactor (in vertical position) at temperature 750 °C in the presence of 30 vol% of oxygen. The concentration of produced MnONPs at the reactor output was in the range 1-3 × 107 particles/cm3 and the size of generated nanoparticles MnO.Mn2O3 was in the range 7-50 nm. Before entering the inhalation chamber, MnONPs in the mixture of N2, O2 and air (at total flow rate of 3 L/min) were further diluted using filtrated humidified air (20 L/min) at temperature 21 °C resulting in the MnONPs concentration 2 × 106 particles/cm3. At regular time intervals the mass of selected internal organs of mice from both experimental and control group was assessed. It has been proven that inhaled nanoparticles are able to influence the mass of internal organs of mice. Statistically significantly lower mass of kidneys, liver and spleen and higher mass of pancreas have been found in the experimental group compared to the control group.

National Repository of Grey Literature : 12 records found   1 - 10next  jump to record:
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2 Zeman, T.
7 Zeman, Tomáš
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