FROM THE RESEARCH LABORATORIES
Investigation of 238U, 234U And 210Po Content in Selected Bulgarian Drinking Water
1)Bozhidar Slavchev, 1)Elena Geleva, 2)Blagorodka Veleva,
1)Hristo Protohristov, 1)Lyuben Dobrev,
1)Desislava Dimitrova, 1)Vladimir Bashev, 1)Dimitar Tonev
1)Institute for Nuclear Research and Nuclear Energy – BAS (Bulgaria)
2)National Institute of Meteorology and Hydrology (Bulgaria)
https://doi.org/10.53656/nat2021-2.01
Abstract. The radioactivity of selected sources of drinking water in Southern Bulgaria was investigated using 238U, 234U and 210Po activity measurements and dose calculation, respectively. The activities of 238U, 234U and 210Po varied from 226 to 826 mBq/L, 274 to 1623 mBq/L and < 0.6 to 25.5 mBq/L, respectively, being lower then derived concentrations for radioactivity in water intended for human consumption of the considered radionuclides, given in EC Directive 2013/51/EURATOM…
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TEACHING EFFICIENCY
The Reflective Skill – Constructive-Prognostic Analysis In Methodological Context
Natasha Tzanova, Nadezhda Raycheva, Isa Hadjiali
Sofia University
https://doi.org/10.53656/nat2021-2.02
Absract. In historical aspect, the skill is among the key categories in the realm of human practice, which are often an object of different researches – psychological, pedagogical, and last but not least methodological...
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Methodological Framework To Develop Meaning Formation Categories In Methodology Of Biology Education
Nadezhda Raycheva
Sofia University
https://doi.org/10.53656/nat2021-2.03
Absract. Science could be thought as mature in cases it obtains clear terminology and methodology i.e. recognizable scientific language and object to be researched...
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EDUCATION: THEORY AND PRACTICE
First Steps In Quantum Physics: Basics – 2. Model Examples (Square Wells)
Mihail Avramov, Dimitar Marvakov
Sofia University
https://doi.org/10.53656/nat2021-2.04
Absract. Cases of a particle in a one-dimensional square well – infinitely deep and with finite depth – are also analyzed in detail.
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CURRICULUM MATTERS
Functional Analisis Of Desing Of Pedagogical Decision As Profesional Skill
Nadezhda Raycheva
Sofia University
https://doi.org/10.53656/nat2021-2.05
Abstract.A part of a professional teacher’s competency is making the pedagogical design in the territory of the defined situation and includes numerous skills that function as a whole and are visible in final result related to evaluation and choice of educational resources or develop ideas for parts or for the whole process of education in a defined pedagogical context...
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NEW APPROACHES
A Study On Reflection With 15 – 17 Year Olds In School Biology Education In An Intellectual And Personality Aspect
Isa Hadjiali
Sofia University
https://doi.org/10.53656/nat2021-2.06
Absract. The report highlights into an empirical study of the intellectual and personality reflection correlations with 15 to 17- year old students in school biology education.
