Thesis Chapters by Nikolay Takuchev
The location of the City of Stara Zagora, Bulgaria, determines the specifics of air currents in t... more The location of the City of Stara Zagora, Bulgaria, determines the specifics of air currents in the area, which in turn induce specific behavior and migration of air pollutants.
The study aims to contribute to a better understanding of the behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the AMS "Zeleniat clin" has a decreasing trend in recent years from 2007 to 2012, respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Zeleniat clin" if no measures are taken to reduce urban emissions of nitrogen oxides.
2. Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Zeleniat clin" in the City of Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone, 2. Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
3. The peak pollution with nitrogen dioxide registered by AMS "Zeleniat Klin" is a local effect in the area around the station. It is due to a combination of specifics of the relief, terrain, meteorological specifics, and combustion installations for heating public buildings located close to the station, a source of powerful emissions of nitrogen dioxide.
4. In the time of research interest from 2007 to 2012, in the region of the City of Stara Zagora, increase the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations, and the concentration of carbon monoxide.
5. Military range "Zmeyovo" is not a source of migrating to the City of Stara Zagora pollution of nitrogen dioxide.
6. Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
INTRODUCTION. The city of Ruse has often suffered from air pollutions. The PURPOSE of the study i... more INTRODUCTION. The city of Ruse has often suffered from air pollutions. The PURPOSE of the study is to estimate both the patients' number in the hospitals of Ruse district due to air pollution and the cost of their treatment. METHODS. The correlation and regression analyzes were used to study the dependencies between the meteorological parameters and the concentrations of air pollutants (obtained by the combination of ground level and satellite monitoring) and the annual number of patients treated in Ruse district hospitals, separated in clinical pathways. The correlation method was used to detect a link between pollutants and clinical pathway morbidity, and the regression method was used to assess the share of patients due to the air pollution. RESULTS. Statistically significant positive correlations were found between the investigated air pollutants and the annual number of the Ruse patients in 73 of the 125 clinical pathways studied. The pollutant with the greatest impact on health, estimated by the number of patients treated in the hospital, was the methane in the ground level air of Ruse, often in combination with benzene and fine particulate matter. Of the air pollutants over Ruse have been affected 15% of the patients treated on clinical pathways and for their treatment spent 17% of the public funds for hospital treatment in Ruse district.
The results of study on air pollution by carbon oxide and health status of thepopulation in the S... more The results of study on air pollution by carbon oxide and health status of thepopulation in the Stara Zagora region, are reported in the work. The study showed that air pollution by carbon oxide caused or favored the emergence and development of diseases of Class XI and XVI of the ICD-10. Relationship of air pollution by carbon oxide with diseases of the remaining 15 classes of ICD-10 non oncologic diseases were not observed.
The results of study on air pollution of nitrogen dioxide and health status of the
population in ... more The results of study on air pollution of nitrogen dioxide and health status of the
population in the Stara Zagora region, are reported in the work. The study showed that air pollution with nitrogen dioxide caused or favored the emergence and aggravation of diseases of Class XI, XII and Xlll of the ICD-10. Relationship of air emissions of nitrogen dioxide with diseases of the remaining 15 classes of ICD-10 non oncologic diseases were not observed.
STUDY OF THE INFLUENCE OF CLIMATE AND RELIEF IN THE REGION OF STARA ZAGORA ON THE BEHAVIOR AND MI... more STUDY OF THE INFLUENCE OF CLIMATE AND RELIEF IN THE REGION OF STARA ZAGORA ON THE BEHAVIOR AND MIGRATION OF POLLUTANTS IN AMBIENT AIR
Nikolay Petrov Takuchev
The location of Stara Zagora determines specifics of air currents in the area, which in turn induce specific behavior and migration of air pollutants.
The aim of the study is to contribute to a better understanding of behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the Automatic Measurement Station (AMS) " Green wedge" has a decreasing trend in recent years from 2007 to 2012 , respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Green wedge" if no measures are taken to reduce urban emissions of nitrogen oxides .
2 . Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Green wedge" in Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone 2 . Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
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3 . In the time of research interest from 2007 to 2012 , in the region of Stara Zagora, increase: the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations , the concentration of carbon monoxide.
4 . Military range " Zmeyovo " is not a source of migrating to Stara Zagora pollution of nitrogen dioxide.
5 . Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
Papers by Nikolay Takuchev
AIP Conference Proceedings, Dec 31, 2022
AIP Conference Proceedings, Dec 31, 2023
Introduction. Increased air pollution with particulate matter (PM) over several large cities in W... more Introduction. Increased air pollution with particulate matter (PM) over several large cities in Western Bulgaria has been observed during the heating season in the last few years. The country's capital Sofia is also located in the western part of the country. The situation with air pollution in Sofia is even more complicated because of its location in a valley, where meteorological conditions often occur, which leads to air pollution. Objective. A study was conducted to extract additional information about the history and dynamics of air pollution in Sofia. A combined method was used – satellite and ground-based observations, covering the last 20 years (for some aspects of the research the data series were with 40 and more years scope).
Material and methods. Data from satellite observations of the region of Sofia for the
last 20 years, were extracted from NASA databases through the GIOVANNI interface. Ground data were received from the Bulgarian Executive Environment Agency (EEA) for five automatic monitoring stations, located in the city area.
Results and conclusions. Increasing PM pollution over the Sofia region is due to meteorological reasons, not due to increased domestic combustion. The wind velocity in the area cyclically changes over 22 years period which is the period of cyclical change of cyclones passing over the Balkan Peninsula and is connected with their winds. For the last few years, the wind velocity cycle has been at its minimum – relatively weak wind. A possible reason for the mentioned cycle is the cycle of the solar magnetic field, which has the same cycle period.
SCIREA journal of physics, Feb 26, 2023
Introduction: According to the results from several studies high-energy positive solar particles'... more Introduction: According to the results from several studies high-energy positive solar particles' fluxes, invading earth are correlated with mortality from ischemic heart diseases. According to statistics from world health organization (who), ischemic heart diseases are the first on the list of the 10 most frequent causes of death in 2016, regardless of the state's economic situation. Objective. A possible mechanism of the observed phenomenon is discussed. An example of the short-term impact of high-energy alpha fluxes on the area of the usa, affecting the short-term female mortality in the region, is explained by the proposed mechanism. Material and methods: Data on solar corpuscular radiation was obtained from an noaa sitefrom the geostationary operational environmental satellite series (goes). High-energy protons and alpha particles' path length through the atmosphere and corresponding energy were calculated by pstar and astar databases and calculators. Data for mortality of ischemic heart
Pedagogika, May 18, 2023
The formation of motivation for learning is a complex process, which also depends on external inf... more The formation of motivation for learning is a complex process, which also depends on external influences, often remaining unconscious to the learner. A study was conducted to reveal causes for significant differences in the learning achievements between the small administratively formed student groups. The study identifies the emotional leaders, and the working hypothesis was that they influence the learning motivation of others – the group learns and has a high average grade if emotional leaders are studious students. And vice versa, if they are weak students the whole group lowers their grades. Material and methods. The advancement in physics of 18 administratively formed groups studying veterinary medicine at Trakia University, Stara Zagora, Bulgaria, was traced objectively by computer tests. The leading criterion in the formation of the groups is which foreign language was studied in high school, i.e. the criterion does not sort students into groups by his/her pre-training or intelligence. Results: The study used a survey, a modification of Moreno’s survey, in which students from each group were arranged in subgroups according to the emotional rank set by their colleagues. Students with a rank above 2/3 of the maximum were marked as “leaders”. Those with a rank below 1/3 as “anti-leaders”, and the rest – as “neutral”. The results from the study study showed that the initial hypothesis was not confirmed – with the highest correlation coefficient with the average grade of the groups was the average grade of the subgroup of anti-leaders, if they are studious students. I.e. the main external motive for learning in the studied case was not the example of the leaders, but striving not to lag behind colleagues to whom you feel negative feelings – from dislike to hatred.
IOP Conference Series: Materials Science and Engineering, 2021
Introduction. The condition of the vegetation cover can be traced from Space. Aim of the research... more Introduction. The condition of the vegetation cover can be traced from Space. Aim of the research. To assess the condition of the vegetation cover in Bulgaria during the last twenty years – its distribution over the country, its change in connection with the typical climatic changes, its seasonal change. Material and methods. The vegetation index NDVI according to NASA data was used to analyze the condition of the vegetation cover in Bulgaria for the years 2000-2020. The methods used were: seasonal data decomposition, t-test, GIS methods for spatial representation of data, Fourier analysis. Conclusions. 1. During the summer months the vegetation in the eastern parts of the territory of Bulgaria is noticeably weaker than in the western parts. The influencing factors-drought and frequent fires are probably related to global warming. 2. For the territory of Bulgaria there is a seasonal rotation of the horizontal gradient of the vegetation index in a counterclockwise direction-from east...
In cases where it is important to track how changes in the environment affect the vital activity ... more In cases where it is important to track how changes in the environment affect the vital activity of a living organism (the main task of ecology), it is necessary to use quantities whose numerical values change accordingly (adequately) to the reaction of living organisms to changes in the environment. Changes in human sensations under the influence of environmental changes have been studied best compared to those of other living organisms, which is why anthropomorphic (human-like) quantities – adequate to human sensations – are most used for ecology. An example of such are all quantities whose definitions in one form or another are adapted to human senses – photometric and colorimetric quantities are adapted to human vision, sound level – to the threshold of sound perception by the human ear. But such values are also the temperature – within certain limits, it characterizes the human feeling of the heat of the environment, and the relative humidity of the air as a characteristic of the human feeling of the state and change of air humidity.
Clarifying the anthropomorphic meaning of the latter is the aim of the present report.
Published in proceedings of 40th national conference on physics education, Gabrovo, April 5-8, 2012, 185-188.
Introduction. Between 2006 and 2012, the stationary automatic air quality monitoring station in S... more Introduction. Between 2006 and 2012, the stationary automatic air quality monitoring station in Stara Zagora, Bulgaria repeatedly registered peaks of gassing with nitrogen dioxide with concentration over threshold levels (a record for the country) with unknown origen. The main suspect was traffic оn the street near the measuring station. Objective. To confirm or reject the hypothesis that traffic is the source of the peaks with nitrogen dioxide concentration above the threshold level. Material and methods. At the same time of the year when peak air pollution with nitrogen dioxide was registered several times - late autumn, an experiment was carried out twice - in 2010, repeated in 2017, involving: 1. counting of the motor vehicles crossing a junction with at least twice as intense as traffic on the street in front of the stationary station; 2. the air pollution emitted by the motor vehicles was estimated by the subsequent dispersion modeling. During the counting, a mobile station was used to measure the total urban pollution in the area of the junction. A comparative analysis of the calculated concentrations of pollutants (from traffic) and the concentrations measured by the mobile station from all sources in the area was made. The counting was repeated at the same intersection in 2017. The changes in traffic and pollution which have been happening for 7 years are estimated. Results and discussion. It was found that for 7 years in the city's car fleet, there is only a change in the number of small passenger carsthey have decreased 49 times. There are no changes in the ratio between the other categories of motor vehicles. The maximum nitrogen oxide concentrations, both measured and calculated, are close in magnitude and are several times smaller than the measured peak values of the stationary station, although the mobile station was double closer to the center of the intersection than the stationary station to the near street with traffic. Concentrations measured at different times in the junction area show close values, indicating little variability of nitrogen oxides pollution over time without sharp peaks. The analysis of the experiment data showed that the traffic is not the source of the peak pollution with nitrogen dioxide over Stara Zagora. Graphic analysis has shown that nitrogen oxides pollution often concentrates around the southwestern corner of junctions due to the predominant wind direction from the north-northeast for the city. The share of carbon oxide pollution from traffic is 10% of total CO pollution. The proportion of fine particles (soot) from motor engines is 5% of the measured particulate matter (PM10) in the junction area.
The article was published in: Chemistry: Bulgarian Journal of Science Education Volume 27 Number 1, 2018 (In Bulgarian).
Traveling on a hot summer's day, everyone has observed in the distance the heated asphalt glisten... more Traveling on a hot summer's day, everyone has observed in the distance the heated asphalt glistening spots resembling the surface of the water a mirage due to the curvature of the path of light as a result of the change in the density of the air in a vertical direction above the heated asphalt, where the sky above the asphalt is observed. Mirages can also be observed in space, but the reason for the curvature of light there is different in the gravitational distortion of the light beam coming from a distant object and passing by a massive body, for example, a cluster of galaxies, which plays the role of a gravitational lens.
Below is an example of creating a site for calculating the conditions for the appearance of a lens effect in space.
Published in proceedings of XXXV national conf. on physics education issues. Pleven, Bulgaria, April 1-4, 2007, 183-186.
An Impression of one visit to UK Science and Technology Centers and their work with young childre... more An Impression of one visit to UK Science and Technology Centers and their work with young children. Published in Proceedings of 35th Bulgarian conference “The experiment in physics education“, 2007, 176 – 178.
Introduction: The City of Stara Zagora frequently suffers from air pollution above threshold leve... more Introduction: The City of Stara Zagora frequently suffers from air pollution above threshold levels, but often the sources remain unclear. In November 2009 and November 2012 the nitrogen oxides pollution, recorded with a stationary automatic environmental station in the city was four times above the allowable concentration-a record for the country until now. Public opinion often blames the traffic near the station for nitrogen oxide pollution. Objective: Assessment of the contribution of traffic to air pollution with nitrogen oxides over Stara Zagora's busy street near the station by comparing the calculated traffic emissions with measured pollutant concentration by the nearby automatic environmental station. Material and methods: The vehicles passing along the street were counted and the results were used as input data in a dispersion model "Traffic Oracle" for the calculation of pollutant concentration. Results: The maximum of the traffic emitted concentration was one-third of the measured one. Therefore, there is/are another, more powerful source/s of air pollution with nitrogen oxides near the environmental station.
The microclimate of the Ancient Thracian tomb of Kazanlak, Bulgaria, under the protection of UNESCO - current state and recommendations for its improvement, 2023
The microclimatic study of the Ancient Thracian tomb of Kazanlak, Bulgaria, under the protection ... more The microclimatic study of the Ancient Thracian tomb of Kazanlak, Bulgaria, under the protection of UNESCO, was carried out. A number of problems were found in maintaining the microclimate in the building protecting the tomb. Based on specific photographic material and data from the microclimate monitoring devices, conclusions were made about the state of the tomb. Recommendations were given for the elimination of the identified problems.
The present work describes the results of a study designed to examine how the process of accumula... more The present work describes the results of a study designed to examine how the process of accumulation of knowledge and the development of environmental thinking in the secondary school affects students' assessment of the benefit and risk of using synthetic substances in contact with the skin. The high school students' perception of the risk and benefit of the use of synthetic substances in contact with the skin undergo changes in the course of study. Indices of risk and benefit are proposed for quantitative monitoring of changes, calculated from an inquiry data collected from 6 groups respondents with 48 members each-students at the beginning, at the middle and at the end of their secondary school education and citizens. The index of risk goes through a minimum, and that of benefit reaches its maximum at the end of secondary education. The benefit index remains greater than the risk index in the course of study, which indicates formed students' notion of the prevailing b...
Introduction. The formation of motivation for learning is a complex process, which also depends o... more Introduction. The formation of motivation for learning is a complex process, which also depends on external influences, often remaining unconscious for the learner. Objective: The paper presents the results of a study aimed at revealing the reasons for a noticeable difference in the success of groups of first-year students, studying physics at Trakia University, Stara Zagora, Bulgaria. Material and methods. The advancement in physics of 18 administratively formed groups in the second semester when they study physics, was traced. The leading criterion in the formation of the groups is which foreign language was studied in high school, i.e. the criterion does not sort students into groups by his/her pre-training or intelligence. There were 9-12 people in each group. The average group grade was formed by multiple assessments of each of the students in the group with computer tests, which put an objective grade automatically, without the participation of a human assessor. There were sta...
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Thesis Chapters by Nikolay Takuchev
The study aims to contribute to a better understanding of the behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the AMS "Zeleniat clin" has a decreasing trend in recent years from 2007 to 2012, respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Zeleniat clin" if no measures are taken to reduce urban emissions of nitrogen oxides.
2. Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Zeleniat clin" in the City of Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone, 2. Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
3. The peak pollution with nitrogen dioxide registered by AMS "Zeleniat Klin" is a local effect in the area around the station. It is due to a combination of specifics of the relief, terrain, meteorological specifics, and combustion installations for heating public buildings located close to the station, a source of powerful emissions of nitrogen dioxide.
4. In the time of research interest from 2007 to 2012, in the region of the City of Stara Zagora, increase the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations, and the concentration of carbon monoxide.
5. Military range "Zmeyovo" is not a source of migrating to the City of Stara Zagora pollution of nitrogen dioxide.
6. Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
population in the Stara Zagora region, are reported in the work. The study showed that air pollution with nitrogen dioxide caused or favored the emergence and aggravation of diseases of Class XI, XII and Xlll of the ICD-10. Relationship of air emissions of nitrogen dioxide with diseases of the remaining 15 classes of ICD-10 non oncologic diseases were not observed.
Nikolay Petrov Takuchev
The location of Stara Zagora determines specifics of air currents in the area, which in turn induce specific behavior and migration of air pollutants.
The aim of the study is to contribute to a better understanding of behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the Automatic Measurement Station (AMS) " Green wedge" has a decreasing trend in recent years from 2007 to 2012 , respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Green wedge" if no measures are taken to reduce urban emissions of nitrogen oxides .
2 . Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Green wedge" in Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone 2 . Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
60
3 . In the time of research interest from 2007 to 2012 , in the region of Stara Zagora, increase: the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations , the concentration of carbon monoxide.
4 . Military range " Zmeyovo " is not a source of migrating to Stara Zagora pollution of nitrogen dioxide.
5 . Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
Papers by Nikolay Takuchev
Material and methods. Data from satellite observations of the region of Sofia for the
last 20 years, were extracted from NASA databases through the GIOVANNI interface. Ground data were received from the Bulgarian Executive Environment Agency (EEA) for five automatic monitoring stations, located in the city area.
Results and conclusions. Increasing PM pollution over the Sofia region is due to meteorological reasons, not due to increased domestic combustion. The wind velocity in the area cyclically changes over 22 years period which is the period of cyclical change of cyclones passing over the Balkan Peninsula and is connected with their winds. For the last few years, the wind velocity cycle has been at its minimum – relatively weak wind. A possible reason for the mentioned cycle is the cycle of the solar magnetic field, which has the same cycle period.
Clarifying the anthropomorphic meaning of the latter is the aim of the present report.
Published in proceedings of 40th national conference on physics education, Gabrovo, April 5-8, 2012, 185-188.
The article was published in: Chemistry: Bulgarian Journal of Science Education Volume 27 Number 1, 2018 (In Bulgarian).
Below is an example of creating a site for calculating the conditions for the appearance of a lens effect in space.
Published in proceedings of XXXV national conf. on physics education issues. Pleven, Bulgaria, April 1-4, 2007, 183-186.
The study aims to contribute to a better understanding of the behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the AMS "Zeleniat clin" has a decreasing trend in recent years from 2007 to 2012, respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Zeleniat clin" if no measures are taken to reduce urban emissions of nitrogen oxides.
2. Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Zeleniat clin" in the City of Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone, 2. Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
3. The peak pollution with nitrogen dioxide registered by AMS "Zeleniat Klin" is a local effect in the area around the station. It is due to a combination of specifics of the relief, terrain, meteorological specifics, and combustion installations for heating public buildings located close to the station, a source of powerful emissions of nitrogen dioxide.
4. In the time of research interest from 2007 to 2012, in the region of the City of Stara Zagora, increase the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations, and the concentration of carbon monoxide.
5. Military range "Zmeyovo" is not a source of migrating to the City of Stara Zagora pollution of nitrogen dioxide.
6. Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
population in the Stara Zagora region, are reported in the work. The study showed that air pollution with nitrogen dioxide caused or favored the emergence and aggravation of diseases of Class XI, XII and Xlll of the ICD-10. Relationship of air emissions of nitrogen dioxide with diseases of the remaining 15 classes of ICD-10 non oncologic diseases were not observed.
Nikolay Petrov Takuchev
The location of Stara Zagora determines specifics of air currents in the area, which in turn induce specific behavior and migration of air pollutants.
The aim of the study is to contribute to a better understanding of behavior and migration of air contaminants in the region.
As a result of the study it was found that :
1. Minimum wind speed in the area around the Automatic Measurement Station (AMS) " Green wedge" has a decreasing trend in recent years from 2007 to 2012 , respectively, the November’s Planetary boundary layer dynamic stability increases. These phenomena are a prerequisite for above-threshold increased exposure to pollution by nitrogen dioxide around AMS "Green wedge" if no measures are taken to reduce urban emissions of nitrogen oxides .
2 . Morning and evening peaks in the diurnal variation in the concentration of nitrogen dioxide measured by AMS "Green wedge" in Stara Zagora are due to meteorological phenomena with diurnal periodicity: 1. Synthesis and decomposition of ozone 2 . Local atmospheric circulation and 3. Diurnal variation of the planetary boundary layer dynamic stability. They are not due to the sudden increase in emissions at the beginning and the end of the workday.
60
3 . In the time of research interest from 2007 to 2012 , in the region of Stara Zagora, increase: the minimum concentration of sulfur dioxide; concentration of fine particles, the minimum concentration of nitrogen dioxide, hydrogen sulfide concentrations , the concentration of carbon monoxide.
4 . Military range " Zmeyovo " is not a source of migrating to Stara Zagora pollution of nitrogen dioxide.
5 . Energy Complex "Maritza East" was and remains a major source of migrating contamination to the city of Stara Zagora.
Material and methods. Data from satellite observations of the region of Sofia for the
last 20 years, were extracted from NASA databases through the GIOVANNI interface. Ground data were received from the Bulgarian Executive Environment Agency (EEA) for five automatic monitoring stations, located in the city area.
Results and conclusions. Increasing PM pollution over the Sofia region is due to meteorological reasons, not due to increased domestic combustion. The wind velocity in the area cyclically changes over 22 years period which is the period of cyclical change of cyclones passing over the Balkan Peninsula and is connected with their winds. For the last few years, the wind velocity cycle has been at its minimum – relatively weak wind. A possible reason for the mentioned cycle is the cycle of the solar magnetic field, which has the same cycle period.
Clarifying the anthropomorphic meaning of the latter is the aim of the present report.
Published in proceedings of 40th national conference on physics education, Gabrovo, April 5-8, 2012, 185-188.
The article was published in: Chemistry: Bulgarian Journal of Science Education Volume 27 Number 1, 2018 (In Bulgarian).
Below is an example of creating a site for calculating the conditions for the appearance of a lens effect in space.
Published in proceedings of XXXV national conf. on physics education issues. Pleven, Bulgaria, April 1-4, 2007, 183-186.
Цел. В доклада са обсъжда възможността броят на самоубийствата в страната да бъде свързан с изменението на слънчевата активност.
Материал и метод. Използвани са данни за стандартизирания брой самоубийства в България от Eurostat за интервала години 1999–2010 и за средногодишния брой слънчеви петна, изчислен по данни на NASA.
Резултати и обсъждане. Корелационният коефициент между броя на слънчевите петна и броя на самоубийствата за изследвания интервал се оказа висок: 0,970, с ниво на статистическа значимост под 0,1 %. Доколкото изследваната редица от данни е твърде къса – само за 1 цикъл на Швабе, е прибързано да се твърди, че слънчевата активност е една от възможните причини за самоубийствата в България, но високият корелационен коефициент е повод подобни изследвания да продължат. Не е изключено слънчевата активност да е вероятен пусков механизъм и за повишеното в последните години обществено напрежение,изразяващо се в непрекъснати протести.