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Advanced Methods for Damage Evaluation of Boiler Tube Bundles
Naď, Martin ; Odstrčil, Miloslav (referee) ; Jůza, Zdeněk (referee) ; Jegla, Zdeněk (advisor)
This thesis is focused on the application of advanced methods for evaluating damage to boiler tubes, specifically temperature related damage. The aim of this work is to develop an improved damage evaluation procedure utilizing capabilities of modern approaches. This work describes various types of industrial boiler damage. The main focus is on the most exposed and often the most damaged parts of boilers, which are tube bundles (for example, superheaters). Equipment damage is undesirable and often leads to leakages or even to the boiler shutting down. Therefore, it is necessary to find the problem as soon as possible and make the required changes to prevent further damage. The damage types are divided into five categories based on the damage mechanism. Temperature has one of the biggest influences on damage and it may cause short-term or long-term overheating in the tube bundles. This type of damage occurs when the designated temperature is exceeded and results in reduced creep life. It is necessary to know the real surface temperature history of the tube bundle to estimate temperature related damage, however this is often not available. Therefore, it is necessary to calculate those temperatures based on the available data (i.e. inlet and outlet temperatures and pressures). This is real challenge due to the combination of complex flows of the working substances (mainly flue gasses) and heat transfer. Considering available data, new approach is proposed in order to obtain information required for residual creep life estimation. In the first step, thermal – hydraulic calculation is performed followed by a thermal load estimation of a superheater tube bundle in a natural gas fired boiler, using CFD simulations. In the next step, the surface temperature is evaluated and used to determine the temperature related damage, specifically the creep life estimation. The life expectancy is in some ways influenced by imperfections, and therefore at the end of this thesis the influence of the oxide layer on the inner side of tube and fouling on outer side of tube is described.
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GDP growth and welfare in developing countries: the case study of Nigeria from 2022-2022
Elias Oluwasegun, Emmanuel
This dissertation sought to assess the impact of economic growth, particularly measured by GDP growth, on various welfare indicators within the framework of Nigeria's economy over the past two decades (2002-2022). A critical literature review laid the groundwork, surveying existing research to establish a comprehensive understanding of the theoretical underpinnings and empirical evidence related to economic growth and welfare. The chosen methodology involved the analysis of trends in GDP growth and welfare indicators using secondary data collected from reputable sources. Multivariate regression analysis, executed with the STATA software, enabled a simultaneous examination of the effects of GDP growth on key indicators such as inequality, poverty, unemployment, and life expectancy. The study aimed to provide valuable insights into Nigeria's economic dynamics and their repercussions on societal well-being. By scrutinizing the nuanced relationships between GDP growth and various welfare metrics, the research contributes not only to academic scholarship but also informs policy formulation. The outcomes of this analysis are expected to guide policymakers and stakeholders in shaping strategies that promote sustainable economic growth, thereby positively impacting inequality, poverty rates, unemployment, and overall life expectancy. In essence, this thesis represents a systematic effort to unravel the complexities of the economic-social nexus in Nigeria, offering a holistic perspective on the ramifications of economic growth on the broader welfare landscape.
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Pension insurance and demographic development in the Czech Republic
Železná, Ladislava ; Hulíková Tesárková, Klára (advisor) ; Burcin, Boris (referee)
Pension insurance and demographic development in the Czech Republic Abstract The aim of this thesis is to describe the development of the pension insurance in the Czech Republic and changes in retirement age in relation to the development of life expectancy and changes in the age structure of the population of the Czech Republic. In the first part of the work, there demographic changes of the population are described and in particular, changes in the age structure of the population of the Czech Republic. The second part provides an overview of the historical development of pension insurance in the territory of today's Czech Republic, in particular the development of the most important laws, but also statistical data as well as basic concepts and characteristics of the current pension scheme. In the third part of this thesis are analyzed the changes in the age structure of the population and their relation to raising retirement age in the pension scheme of Czech Republic. Keywords: pension insurance, retirement age, the age structure of the population, life expectancy.
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Comparison of mortality trends in Central Europe and Baltic countries from 1970 to the present
Horník, Vojtěch ; Hulíková Tesárková, Klára (advisor) ; Burcin, Boris (referee)
Comparison of mortality trends in Central Europe and Baltic countries from 1970 to the present Abstract The aim of this thesis is to assess the most important mortality trends development in countries of Central Europe and Baltic region between 1970 and 2009. The measures used involve life expectancy at birth and life expectancy at the age of 65; besides of this, the age-specific contributions to life expectancy changes are computed according to the method of R. Pressat. The convergence and divergence tendencies among the analyzed countries and between the two regions are evaluated in this thesis as well. Main findings are, on one hand, that mortality trends are relatively similar within each of the regions. When comparing regions between each other, however, significant differences, mostly in the period between mid-1980s and mid-1990s, arise, they are attributed mostly to the influence of mortality crisis in Baltic region after the Soviet Union dissolution. Even though after 1994 mortality development was favourable in Baltic countries, they did not reach mortality level of Central Europe until 2009. Keywords: mortality, Central Europe, Baltic countries, life expectancy, decomposition, convergence, divergence
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The Retirement Age - the development and determinats influence over its changes
Nešporová, Stanislava ; Potůček, Martin (advisor) ; Hedbávný, Petr (referee)
The diploma thesis generally focuses on pension systems, specifically on the institution of retirement age. This institution is very important for the old-age pension system and its stability. Retirement age is an important determinant of every pension system. Demographic and economic state of society depends, among other things, on age at which citizens can retire, it's associated with standard of living of state residents. It also affects job opportunities. Since its inception the retirement age in the Czech Republic has gone through many modifications. Based on the theory of actor-centered institutionalism, the diploma thesis addresses the determinants that influenced the development of retirement age institute, including its institutional framework and actors involved in its changes. It also deals with its developmental stages. Comparison with the development in Slovakia (in some parts of diploma thesis only) will be enriched the conceptual, empirical as well as methodological realm of the thesis. Czech and Slovak Republics have shared history but the pension systems of both countries have considerably diverged. In conclusion the diploma thesis specifies the wider context of the retirement age as a part of the overall pension system. Powered by TCPDF (www.tcpdf.org)
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Long term development of life expectancy in the world
Jílková, Martina ; Novotný, Josef (advisor) ; Pospíšilová, Lucie (referee)
Life expectancy has been rising since the end of the 18th century. This thesis aims to characterize its long term development with emphasis on the period after 1800, whereas the beginning periods of sustained growth and its dynamics are represented. Gains in survival began successively in individual countries, and it was found that the later the growth began, the more rapid it was. The determinants of mortality decline are set and described, as well. The attention is paid also to the relation between life expectancy and economic level. The analysis proved strong dependence of life expectancy on income in the course of the 20th century. Finally, the exceptions to this trend are discussed.
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Cementochronology and its importance in forensic anthropology and bioarchaeology: a comparison between individuals of different climatic zones
Pytlíčková, Kristýna ; Brůžek, Jaroslav (advisor) ; Velemínský, Petr (referee)
In the field of forensic anthropology and bioarchaeology, there is a constant search for more suitable and reliable methods that would allow the estimation of age and seasonality at the time of death of individuals. This work is devoted to the method of cementochronology. It is a method that works with continuously growing dental tissue - a cement layer, whose regular periodic growth is closely correlated with increasing age. The diploma thesis is based on 2 sets of teeth of individuals of known age and extraction season, which come from different geographically different populations - Czech and Malaysian. The group of the Czech population contains a total of 21 teeth, the group of the Malaysian population contains 11 teeth. Histological specimens were prepared from these samples and 5 sections were analyzed from each individual, in which the incremental lines of the root cement layer were counted and the nature of the last incremental line to estimate seasonality. The results of age estimation achieved by us in both groups, the Czech and Malaysian populations, were close to the chronological age of the individual. The average difference between these ages in the samples of the Czech population was 1,15 years, with the results being overestimated more often. The average difference in the sample of...
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Factors affecting mortality in countries with the highest life expectancy at birth with focus on the influence of tobacco smoking
Liška, Jiří ; Hulíková Tesárková, Klára (advisor) ; Burcin, Boris (referee)
Factors affecting mortality in countries with the highest life expectancy at birth with focus on the influence of tobacco smoking Abstract This bachelor thesis focuses on the factors influencing mortality levels, specifically analysing the influence of tobacco smoking in countries with highest life expectancies - Japan and Switzerland. Trends in smoking prevalence rates from the mid-20th century to the present are analysed. In both countries, the prevalence of smoking is higher in men than in women, but the gap is narrowing over time. Then, author constructs life tables using data from WHO Mortality Database and analyses mortality in Japan and Switzerland between 1995 and 2017, focusing on life expectancy at birth and at ages of 35 and 65 years. The actual development of these indicators is compared with two hypothetical developments, assuming the elimination of smoking attributable mortality and a constant level of smoking attributable mortality. The results indicate that high life expectancies in Japan and Switzerland are not caused by low numbers of smokers in these countries. Keywords: mortality, life expectancy, determinants of health, smoking, Japan, Switzerland
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Development of total mortality and mortality from selected causes of death in the Czech and Slovak regions since 2001
Mondeková, Alexandra ; Burcin, Boris (advisor) ; Maláková, Kateřina (referee)
The main aim of the bachelor thesis is to analyse total mortality and selected causes of death in Czechia and Slovakia, based at regional level. It means a comparison of their development for each region in both countries. The analyse is monitored from 2001 to 2018. The first part of the analysis is devoted to the analysis of the total mortality using various indicators as a life expectancy at birth and life expectancy at 65 years. Also, this part is finished by decomposition method which complements the results of life expectancy at birth. Following the development of total mortality, second part of the analysis is about selected causes of death. Only the diseases that are most numerous in both countries were chosen for this part of the thesis. In terms of total mortality, the main result is that mortality rates are improving in the Czechia and Slovakia, which is reflected in increasing of life expectancy. As part of the analysis of mortality from selected causes of death, it was found that during the observed period there was a decrease in the intensity of mortality from the category of diseases of the circulatory system. The trend from mortality in cancer is slightly different, because while the intensity of mortality is declining in the Czechia, in Slovakia the trend is very slow for men and essentially...
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Social Determinants of Life Expectancy in Transition Economies
Song, Fei ; Bryndová, Lucie (advisor) ; Vykoukal, Jiří (referee) ; Háva, Petr (referee)
This thesis investigates the impact of social determinants on life expectancy in 16 transition economies from 1995 to 2012 by a panel data regression analysis. The regression result suggests that, air quality, coverage for tertiary education, spending in health care have statistically positive associations with life expectancy. To be specific, 1 microgram per cubic meter reduction in PM 2.5 air pollution(mean annual exposure) is associated with a gain of 2.16 months of life expectancy at birth. 100 dollars increase in health expenditure per capita is associated with a gain of 2.4 months of life expectancy at birth. 10% points increase in the gross enrolment ratio for tertiary school is associated with a gain of 3.6 months of life expectancy. But the proxy variable of democracy(Unified Democracy Sores), Economic Freedom and out-of-pocket health expenditure are not significant factors of life expectancy.
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