Abstract
Exceeding the norms and limits of atmospheric air pollution causes enormous damage to the population’s health and the environment. Determining the factors affecting air quality is a current ...task in a local, regional, and global scale. In this study, we use daily time series data for the main air pollutants in Burgas, Bulgaria – O
3
, NO, NO
2
, CO, SO
2
, and PM
10
, to analyze, model, and forecast these levels depending on meteorological factors. For this purpose, the stochastic ARIMA method and ARIMA with transfer functions are applied. Results are obtained for univariate and multivariate time series. Particular attention is paid to the concentrations of the secondary pollutant ground-level ozone (O
3
), which are modelled as a function of all variables considered. Results were evaluated using root mean square error, mean absolute percentage errors, and the coefficient of determination. Short-term forecasts have been obtained for seven days ahead. Model accuracy up to 84% has been established.
ENABLING CITY DIGITAL TWINS THROUGH URBAN LIVING LABS
The international archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences,
05/2022
Conference Proceeding
Abstract
High levels of air pollution are dangerous to human health, which is a current problem for densely populated cities worldwide. Studying this problem can help detect pollutants’ time ...dependencies on basic meteorological measurements and other factors for future prediction and elaborate corresponding alarms when official upper pollution limits are exceeded. In this work, time-causal models based on previous daily time observations and meteorological measurements in the city of Plovdiv, Bulgaria, are applied. Vector-type temporal-causal models are constructed and analyzed for carbon dioxide (CO2), nitrogen dioxide (NO2), sulfur dioxide (SO2), and fine dust particles below size 10, 2.5, and 1 micron (PM10, PM2.5, and PM1), respectively. Pollution levels are predicted seven days ahead.
Quantum electrodynamics in very strong Coulomb fields is one scope which has not yet been tested experimentally with sufficient accuracy to really determine whether the perturbative approach is ...valid. One sensitive test is the determination of the 1s Lamb shift in highly-charged very heavy ions. The 1s Lamb shift of hydrogen-like lead (Pb81+) and gold (Au78+) has been determined using the novel detector concept of silicon microcalorimeters for the detection of hard x-rays. The results of ( 260 53 ) eV for lead and ( 211 42 ) eV for gold are within the error bars in good agreement with theoretical predictions. To our knowledge, for hydrogen-like lead, this represents the most accurate determination of the 1s Lamb shift.
PURPOSE: The aim of the present study was to improve the theoretical knowledge of Taekwon-Do athletes during the Covid-19 pandemic by applying interactive teaching methods. MATERIALS AND METHODS: The ...study was conducted in the period 01.01.2021-28.02.2022 year. Nine videos have been prepared and published to present some of the obligatory theoretical knowledge in Taekwon-Do in an accessible and interesting way. Frequency and SWOT-analysis were applied. RESULTS: Graphic images and the presence of so. An avatar who comments was perceived positively and directs the athletes' attention to the key moments in the video. The questions asked help to establish a "virtual dialogue" and provoke athletes to think about the issues under consideration. CONCLUSION: The use of interactive methods for presenting the theoretical material helps for better absorption by athletes.
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