Zobrazeno 1 - 10
of 146
pro vyhledávání: '"Jaroslav Vrba"'
Autor:
Lenka Kajgrová, Vojtech Kolar, Koushik Roy, Zdeněk Adámek, Petr Blabolil, Radovan Kopp, Jan Mráz, Martin Musil, Oldřich Pecha, Libor Pechar, Jan Potužák, Jaroslav Vrba
Publikováno v:
Environmental Sciences Europe, Vol 36, Iss 1, Pp 1-9 (2024)
Abstract Background This study examines seasonal and regional trends in chlorophyll-a concentrations and the dynamics of nitrogen (N) and phosphorus (P) in 32 fishponds (resulting in 150 pond-year cases) employed for fish production. Fishponds have a
Externí odkaz:
https://doaj.org/article/989c7bd3a4a44e70b4c09593c112f527
Autor:
Miroslav Macek, Jaroslav Vrba, Josef Hejzlar, Klára Řeháková, Jiří Jarošík, Michal Šorf, Karel Šimek
Publikováno v:
Diversity, Vol 16, Iss 9, p 534 (2024)
The perception of the importance of ciliate in freshwater has changed dramatically since the “microbial loop” conceptualisation, reflecting methodological attempts. The data from two decades (1994–2018) on the surface (0–3 m) ciliate assembla
Externí odkaz:
https://doaj.org/article/2d5481012e894fe183a630c6b82b0aee
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 9, Pp 1-16 (2023)
Abstract The present work is devoted to the study of the dynamics of charged particles around Simpson–Visser black holes (with the length parameter $$ l\le $$ l ≤ 2) and wormholes ( $$l>2$$ l > 2 ) immersed in an external asymptotically uniform m
Externí odkaz:
https://doaj.org/article/d6a9a9afa02c4550a0320623b770c479
Autor:
Jaroslav Vrba
Publikováno v:
Universe, Vol 10, Iss 1, p 9 (2023)
Recently, Ovalle and his collaborators proposed an exact solution to Einstein’s equations. In this study, we investigate the main characteristics of the spherically symmetric spacetime determined by the hair parameter l, with a specific focus on ci
Externí odkaz:
https://doaj.org/article/b13919eea83e429a9b5f37834749f5fc
Publikováno v:
Ecology and Evolution, Vol 13, Iss 3, Pp n/a-n/a (2023)
Abstract Quillworts (Isoëtes) represent highly specialized flora of softwater lakes, that is, freshwater ecosystems potentially sensitive to acidification. In this paper, we combine a review of previous studies and our new results to address unrecog
Externí odkaz:
https://doaj.org/article/ab3010395d8b4c6f9809380fb739de39
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 6, Pp 1-13 (2021)
Abstract Extremely compact objects trap gravitational waves or neutrinos, assumed to move along null geodesics in the trapping regions. The trapping of neutrinos was extensively studied for spherically symmetric extremely compact objects constructed
Externí odkaz:
https://doaj.org/article/5ad01e64581146779e4601e28dbca734
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 11, Pp 1-20 (2020)
Abstract Extremely compact objects containing a region of trapped null geodesics could be of astrophysical relevance due to trapping of neutrinos with consequent impact on cooling processes or trapping of gravitational waves. These objects have previ
Externí odkaz:
https://doaj.org/article/f243dd43185d4e77846c3bc5c8f268fa
Autor:
Jana Petruželová, Jindřiška Bojková, Jan Sychra, Vanda Šorfová, Vendula Polášková, Jaroslav Vrba
Publikováno v:
Journal of Limnology (2022)
Littoral macroinvertebrates in acidified waterbodies are affected by the interaction of acidification and local environmental conditions. Understanding the interplay of these factors in the structuring of communities is essential for interpreting res
Externí odkaz:
https://doaj.org/article/88d84ab2aaea4bb49faac34543bfa7fb
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-15 (2019)
Abstract We study spherically symmetric magnetically charged generic black hole solutions of general relativity coupled to non-linear electrodynamics (NED). For characteristic values of the generic spacetime parameters we give the position of horizon
Externí odkaz:
https://doaj.org/article/e8db1ed654a642e99a581fe4a13d0617
Publikováno v:
Water, Vol 14, Iss 13, p 1979 (2022)
Fishponds with a relatively small water volume, high fish abundance, and wide range of nutrient concentrations serve as suitable models for ecological studies. Intensified fish production, together with increased input of nutrients from the watershed
Externí odkaz:
https://doaj.org/article/9f53081e26eb47bba7c7e8d6d949c6d0