National Repository of Grey Literature 117 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Estimates of light pollution from urban areas and industrial complexes
Vershyhora, Denys ; Matějíček, Luboš (advisor) ; Kopačková, Veronika (referee)
Light pollution is no longer seen as a problem only for astronomy. Light pollution is an emerging environmental problem that comes along with more intensive urbanization and industrialization. In the last few years, it has been recognized as a serious pollution problem with negative consequences for the environment and human health. The threat to human health from light pollution has increased dramatically in recent decades, and it is estimated that today more than 80% of the world's population is affected by the prevalence of light pollution in various forms. The main producers of light pollution are large cities and industrial complexes, street and advertising lighting. Most of the emitted light is directed or reflected upwards, creating so-called light domes above the residences. In the night sky, changes in brightness are prominent in suburban environments, while these changes are less noticeable in rural landscapes. This thesis examines the state of light pollution and its impact on the brightness of the night sky in the Czech Republic and Ukraine for the period 2013-2021 using data from VIIRS satellite images received from the Google Earth Engine platform. JavaScript code was created for this data to group the images to create a map of light pollution damage per calendar year and classify...
Carbon capture and storage as a part of strategy to reduce carbon dioxide emissions
Salátová, Anežka ; Hůnová, Iva (advisor) ; Matějíček, Luboš (referee)
Fight against climate change is influenced by many factors and it is becoming hot topic not only for scientists. Concentrations of carbon dioxide (CO2) throughout the history of the planet Earth have often been linked to climate change with all consequences, including mass species extinctions. The anthropogenic influence on the development of CO2 levels, with a noticeable onset in the post-industrial era, is an indisputable fact. As a result, it can lead to an increased occurrence or change in the intensity of extreme weather, other climatic phenomena, and even to the limitation of habitability in certain regions or on the planet itself. One of the options for reducing CO2 emissions is the carbon capture and storage or utilization. The main goals of this research is to summarize the described and newly developed technological options in the context of the climate crisis, to evaluate the conditions necessary for the wider and commercial use of this method, including the right political framework and financing, and to evaluate the impact of the ongoing COVID-19 pandemic and the war in Ukraine. Worldwide, there are 31 projects in operation or under construction, mostly used for enhanced oil recovery. The Czech Republic is also intensively dealing with carbon capture and storage, and although none of...
Is it possible to increase the efficiency of separate waste collection to achieve the necessary reduction in calorific value and increase the biological stability of mixed municipal waste?
Novotný, Matěj ; Innemanová, Petra (advisor) ; Matějíček, Luboš (referee)
The bachelor's thesis deals with the topic of processing mixed municipal waste in the Czech Republic and the possibilities of diverting biodegradable waste in such a way as to increase the biological stability of the waste deposited in municipal waste landfills and to fulfill the goals of limiting the landfilling of municipal waste as stipulated by the new waste law. At the same time, it deals with the approaches of neighboring countries, which also address the need to reduce the volume of landfilled municipal waste by 2030 in accordance with the requirements of the European Union. In the practical part, five samples of mixed municipal waste are subsequently analyzed and the possibilities of diverting individual components are discussed here. Key words: waste, biodegradable waste, landfilling, waste composition
Safety problems of modern nuclear reactors
Kukla, Jaroslav ; Přibil, Rudolf (advisor) ; Matějíček, Luboš (referee)
Jaroslav Kukla Otázky bezpe nosti moderních jaderných reaktor Bakalá ská práce Abstract: This study is concerned with safety factors of nuclear reactors. It summarizes history of nuclear reactors development and analyses causes of some serious accidents, which occurred in the past. It describes physical characteristics of radioactive radiation and mentions a basic survey of quantities and units. Then it describes the influence of radioactive emission on man and other living organisms. It also defines some reactor components and focuses on general security principles, which are further developed. It shortly explains the methods of evaluation of safety factors of nuclear reactors and a role of nuclear supervision. It puts nuclear reactors into several generations and every type of reactor is described as for technical and safety aspects, respectively. It refers to contemporary trends in development of nuclear reactors and in development of their safety.
Assessing the impact of attendance on the selected caves using GIS
Kukla, Jaroslav ; Matějíček, Luboš (advisor) ; Frouz, Jan (referee)
Caves are valuable sites from geological , palaeontological and biological point of view. They are important biotopes of rare and endangered species. Their ecosystem is quite specific and often very independent on environment. Therefore, the caves since the beginning of science have been the subject of research , and gradually also the subject of protection. Caves can also be very attractive objects of interest of tourism. In the Czech Republic there are 14 open to the public karst caves that have regulated attendance, and their access time is subordinated to the interests of nature conservation. On the other hand, there are also a number of caves that are not secured in any way and may be a target of unregulated tourism. This dissertation discusses the evaluation and the impact of attendance on non-karst caves in the National Nature Reserve Canyon Labe, which are freely accessible. I divided the work into three parts. In the first part I dealt with quantifying the attendance of all caves in the area of interest, On the basis of collected data, I made a selection of caves , which I later focused on. In the second part of my work I focused on obtaining information about the visitors and their motivations using public inquiry survey in selected caves, In the third part I tried to analyze the impact...
Air quality index - a tool for ambient air quality assessment
Stráník, Vojtěch ; Hůnová, Iva (advisor) ; Matějíček, Luboš (referee)
7 Abstract Air pollution has a great impact on human health, with acute consequences possibly resulting even in death. It is therefore important to inform the public about up-to-date air quality and its impact on health in a simple and easily undestandable way. Air quality indices seems to be ideal for this purpouse, but there is large variety of them. In this master thesis, the air quality index most suitable for the capital city of Prague has been searched for. A comparison of the following indices has been carried out based on available data: of following indicies based on avaible data (concentration of O3, PM10, NO2, SO2 a CO): Air Quality Index, Aggregate Air Quality Index, Revised Air Quality Index, Common Air Quality Index a Pollution Index and their modifications according to european standards. As a criterion of aptness of a particular index, a degree of correlation between the index itself and corresponding health problems (daily count of deaths, daily count of deaths caused by diseases of the respiratory system, daily count of deaths caused by diseases of circulatory system, daily count of hospitalization caused by diseases of the respiratory system, daily count of hospitalization caused by diseases of circulatory system) of the local population has been chosen. This relationship was verified...
Mapping of water quality in Prague creeks with GIS
Thompsonová, Tereza ; Matějíček, Luboš (advisor) ; Benešová, Libuše (referee)
This thesis is focused in using of Geographic Information Systems (GIS) for mapping water quality in Prague creeks. The theoretical section focuses in a description of GIS and selected GIS projects (SWAT, ZABAGED) including a description of using GIS abroad. Working processes of chemical analyzes required to determine water quality and pollution sources in the area of urbanized basin are explained in the task. The practical section is focused in processing of data, especially mapping of selected creeks and sampling profiles using GIS. Obtained data is processed in tables and charts and used in correlation analysis. A purpose of the project was to demonstrate a possibility of GIS for modelling basin and its parameters.
Mapping of the Litavka catchment using GPS
Hojcsková, Daniela ; Matějíček, Luboš (advisor) ; Brůna, Josef (referee)
This thesis is aimed on the study of Global Positioning System (GPS) and its utilization possibilities in nature sciences such as ecology, hydrology, botany and the others. The main contribution of this work is the investigation of current possibilities of the most accurate data collection by using GPS and their subsequent processing in GIS with focus on small catchment. Other methods of terrain data collection are described and compared with GPS in this work, as well. Practical part of the thesis focuses on characteristics of the locality, technical equipment and data editing gained in terrain. The study locality is the Litavka catchment, which is situated in Brdy. The geographical ground data, were gained from ZABAGED and were completed with results of own measuring in terrain. The output of the thesis is the digital terrain model of upper stream of the Litavka River modified by interpolation. Key words: GPS, DTM, GIS, mapping, catchment, Litavka, interpolation
Environmental impacts of nuclear energy
Malkova, Kristina ; Matějíček, Luboš (advisor) ; Přibil, Rudolf (referee)
Title: Environmental impacts of nuclear energy Author: Malkova Kristina Supervisor: Ing. Luboš Matějíček, Dr., Ústav pro životní prostředí Přírodovědecké fakulty Univerzity Karlovy v Praze, Benátská 2, 128 01 Praha 2 Supervisor's e-mail adress: lmatejic@natur.cuni.cz Abstract: The thesis is focused on study the impact of nuclear energy on the environment regard to non - renewable and renewable energy sources. The work includes evaluation of the entire fuel cycle of the use of various technologies. It includes trends in resource using of nuclear energy with respect to emergency events from a global perspective. Increased attention is also paid to the media impacts nuclear power plant accidents with effects on the environment. Keywords: nuclear energy, energy mix, technology, Chernobyl, Fukushima, nuclear waste

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