|
|
Plant bioindicators of heavy metals
Pecinová, Eliška ; Doležalová Weissmannová, Helena (referee) ; Komendová, Renata (advisor)
The urban areas are exposed to high risk of contamination, and some of the plant species can indicate this contamination. For this study, plants which can accumulate heavy metals and meet the requirements for bioindicators were chosen. Lichens, moss, birch, linden, and yew were chosen as bioindicators. Plant samples were collected from the specified localities in Brno, both with and without heavy traffic, then analysed by atomic absorption spectrometry for the contents of Cd, Cu, Hg, Pb and Zn. Copper (max 47,7 mgkg-1) and zinc (max 200 mgkg-1) were detected in concentrations higher than the lower border of potential phytotoxic concentrations. Lichens and mosses were proved as the best bioindicators for most of the contaminants (Cu, Hg, Pb), except for zinc, which was indicated by birch. Linden wasn’t suitable for biomonitoring. The result concentrations in bioindicators were very variable among localities, without visible effect of traffic load, which implies other factors, which outweighed factors of contamination from the nearby traffic.
|
|
|
Physical activity of primary school children in the Czech Republic, during the COVID-19 pandemic
Pecinová, Eliška ; Pavlů, Dagmar (advisor) ; Nováková, Tereza (referee)
Title: Physical activity of primary school children in the Czech Republic, during the COVID-19 pandemic Objectives: The aim of this diploma thesis is to evaluate how the period of the COVID-19 pandemic in the Czech Republic affected the physical activity of children of younger school age. Methods: The research was conducted using a questionnaire survey. The questionnaire was distributed in electronic version to primary schools (first stage) in the Czech Republic, schools in the capital city of Prague were excluded. In total, 215 responses were obtained. Children of both sexes, aged 6-12, living in the city and in the village and in all 1st grades of primary school corresponded. The collected data were analyzed using absolute percentage numbers, descriptive statistics and the Wilcoxon test. The results were presented in the form of tables and graphs for better clarity. Results: The research sample showed a significant reduction in the amount of physical activity during the COVID-19 pandemic compared to the period before the pandemic. There was no significant difference in the amount of physical activity between children living in the city and in the village. There has also been no evidence of an increase in injuries in the home during a pandemic. The most common physical activity among younger...
|
|
| |
|
|
Plant bioindicators of heavy metals
Pecinová, Eliška ; Doležalová Weissmannová, Helena (referee) ; Komendová, Renata (advisor)
The urban areas are exposed to high risk of contamination, and some of the plant species can indicate this contamination. For this study, plants which can accumulate heavy metals and meet the requirements for bioindicators were chosen. Lichens, moss, birch, linden, and yew were chosen as bioindicators. Plant samples were collected from the specified localities in Brno, both with and without heavy traffic, then analysed by atomic absorption spectrometry for the contents of Cd, Cu, Hg, Pb and Zn. Copper (max 47,7 mgkg-1) and zinc (max 200 mgkg-1) were detected in concentrations higher than the lower border of potential phytotoxic concentrations. Lichens and mosses were proved as the best bioindicators for most of the contaminants (Cu, Hg, Pb), except for zinc, which was indicated by birch. Linden wasn’t suitable for biomonitoring. The result concentrations in bioindicators were very variable among localities, without visible effect of traffic load, which implies other factors, which outweighed factors of contamination from the nearby traffic.
|
|
|
Selected problems from theory of graphs at high school teaching
Jirovský, Lukáš ; Pecinová, Eliška (referee) ; Pavlíková, Pavla (advisor)
Nazev prace: Vybrand problemy z tcorie grafii ve vyucc na stfedni skole Autor: Lukas Jirovsky Katedra: Katedra didaktiky malematiky Vedouci bakalafske prace: RNDr. Pavla Pavlfkova, Ph.D. E-mail vedouciho: pavla.pavlikova@mff.cuni.cz Abstrakt: Klicova slova: Prace pfedstavuje ucebni text zamefeny na problematiku teorie graiu v podobe webovc aplikacc pouzitclny napf. pro matematicky seminar na stfedni skole. Poukazuje na siroke spektrum aplikaci nejen v matcmatice, ale i ostatnich pfcdmetech (fyzika, chemie, geografie,...) a poskytuje matematicky zaklad pro teorii grafu. Soucasti prace je i fada pffkladu na procvicenf vhodnych pro studenty stfednfch skol. teorie grafu, kostra grafu, barvcnf mapy, nejkratsf ccsta v grafu Title: Selected problems from theory of graphs at high school leaching Author: Lukas Jirovsky Department: Department of Didactics of maihematics Supervisor: RNDr. Pavla Pavlikova, Ph.D. Supervisor's e-mail adress: pavla.pavlikova@mff.cuni.cz Abstract: Keywords: The educational website describing the wide usage of graph theory at high school teaching. It adverts to many possible applications in non-mathematical subjects (physical science, chemistry, geography...). The work also contains many exercises and basics of graph theory. Graph Theory, Spanning Tree, Map Colouring, Shortest Path Tree.
|
|
|
Groups of small orders
Sláma, Jiří ; Pecinová, Eliška (referee) ; Bečvář, Jindřich (advisor)
The first part of the thesis presents elementary facts and results of the theory of groups. The second part explains Sylow's subgroups theory containing, among others, formulations and proofs of the three Sylow's theorems which are important tools in analysing the structure of mainly nonabelian groups. The goal of the following part is to describe the structure of all finite groups up to order 15. Basically, there are two possible approaches to the characterization of these groups - one can either focus just on these particular groups or describe groups with order of e.g. prime power and then use the results to solve the task. The author of this thesis chooses reasonable middle ground between overly specific approach and one too complicated. As a result of this choice, the description of all finite abelian groups is included. The theory is illustrated with some demonstrative examples, with emphasis on those outside of "the pure matematics".
|
|
| |
guest ::
RSS feed.