Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Jan HAVELKA"'
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 13, Iss 0, Pp 43-48 (2017)
In this contribution we focus on recovery of spatial distribution of material parameters utilizing only non-invasive boundary measurements. Such methods has gained its importance as imaging techniques in medicine, geophysics or archaeology. We apply
Externí odkaz:
https://doaj.org/article/7d5d6ae8af5c4612be492183022b2296
Publikováno v:
Forests, Vol 11, Iss 9, p 911 (2020)
Nearctic aphid Cinara splendens (Gillette and Palmer, 1924) was collected on ornamental Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) in South Bohemia in 2009. It was the first record of this species in the Palaearctic region. The aim of this re
Externí odkaz:
https://doaj.org/article/2490195122ac4924920800c9db17e43e
Autor:
Martina ŽUROVCOVÁ, Jan HAVELKA, Petr STARÝ, Pavlína VĚCHTOVÁ, Daniela CHUNDELOVÁ, Andrea JAROŠOVÁ, Lucie KUČEROVÁ
Publikováno v:
European Journal of Entomology, Vol 107, Iss 2, Pp 147-156 (2010)
The sequence diversity in the mitochondrial cytochrome-c oxidase I (COI) gene was evaluated as a tool for resolving differences among species of European adelgids collected from several localities across the Czech Republic. Members of 7 genera and 16
Externí odkaz:
https://doaj.org/article/338b27bea5ec4b8ca988fe61c3f86cc4
Autor:
Jan HAVELKA, Petr STARÝ
Publikováno v:
European Journal of Entomology, Vol 104, Iss 3, Pp 471-477 (2007)
Myzocallis (Lineomyzocallis) walshii (Monell), a North American aphid species associated with Quercus rubra was detected for the first time in Europe in 1988 (France), and subsequently in several other countries - Switzerland, Spain, Andorra, Italy,
Externí odkaz:
https://doaj.org/article/2f49efabfb4c4148a65c853be1b09956
Autor:
Jan HAVELKA, Vladimír LANDA
Publikováno v:
European Journal of Entomology, Vol 104, Iss 1, Pp 81-87 (2007)
Determination of embryonic stages is an important prerequisite for the long-term cryopreservation of eggs and embryos of the predatory gall midge Aphidoletes aphidimyza. This paper describes the embryonic development of this insect based on light mic
Externí odkaz:
https://doaj.org/article/9290acd2fe224aac9506f779b047090e
Autor:
Vladimír KOŠŤÁL, Jan HAVELKA
Publikováno v:
European Journal of Entomology, Vol 97, Iss 3, Pp 433-436 (2000)
Diapausing larvae of Aphidoletes aphidimyza (Diptera: Cecidomyiidae) had relatively low supercooling points (SCP) ranging from -19.0 to -26.4°C. None of the specimens that froze at this temperature survived. A high survival rate (up to 87%) at -10°
Externí odkaz:
https://doaj.org/article/560706e4cd8845459e8f2b62441b0563
Autor:
Alena Bartosova, Fanny Jeppsson Stahl, Conrad Brendel, Johan Temnerud, Jan Havelka, Berit Arheimer
Plastic pollution is one of the major global water quality issues. Yet the lack of consistent data and standardized monitoring and assessment methods leads to a wide range of uncertainties in estimating the plastic load that is being delivered to mar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c55ea916f951de439a14b4cc416c8b1c
https://doi.org/10.5194/egusphere-egu23-13804
https://doi.org/10.5194/egusphere-egu23-13804
Publikováno v:
Advances in On-and Offshore Archaeological Prospection ISBN: 9783928794831
Archaeogeophysical prospection is necessary when planning large constructions. Motorized magnetometry systems offer an effective method to identify archaeology prior the construction. A sufficiently large area must be surveyed to estimate the archaeo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8f315381d04b806762ea577ad8dad2e
https://doi.org/10.38072/978-3-928794-83-1/p77
https://doi.org/10.38072/978-3-928794-83-1/p77
Autor:
Peter Milo, Andrey Aladzhov, Petar Dimitrov, Jan Havelka, Mariya Manolova-Voykova, Beáta Milová, Anna Mária Rekemová, Dávi Šálka, Tomáš Tencer, Michal Vágner
Publikováno v:
Advances in On-and Offshore Archaeological Prospection ISBN: 9783928794831
Geophysical surveys in Pliska and Veliki Preslav (Bulgaria) brought a breakthrough in our view of the appearance of early medieval centres in the Balkans. Urban planning on a scale of dozens of hectares has been documented for the first time. It has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35787c62f0b083652d67914625647a27
https://doi.org/10.38072/978-3-928794-83-1/p39
https://doi.org/10.38072/978-3-928794-83-1/p39
Autor:
Jan Havelka, Peter Milo
Publikováno v:
Archaeologia historica. :7-37
Jedenácté až dvanácté století je na Moravě obdobím upevnění přemyslovské moci, která se projevuje vznikem knížecích údělů a nových opevněných center v rámci hradské soustavy. Cílem práce je prezentovat výsledky nedestruktiv