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32. Rozhovor s Ivanem Pelantem
- Creator:
- Valenta, Jan and Pelant, Ivan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fyzika, physics, 6, and 53
- Language:
- Czech
- Description:
- Jan Valenta.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
33. Sedmdesát let vývoje a výroby elektronových mikroskopů v ČSR aneb Brněnská singularita
- Creator:
- Valenta, Jan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- elektronová mikroskopie, mikroskopy, dějiny, electron microscopy, microscopes, history, Československo, Czechoslovakia, 6, and 53
- Language:
- Czech
- Description:
- První sériově vyráběný elektronový mikroskop (EM) uvedla na trh firma Siemens před 80 lety v roce 1939 (obr. 1). Teprve o deset let později byl zkonstruován první EM v Československu skupinou mladých pracovníků kolem profesora Aleše Bláhy v Brně. Z tohoto nenápadného počátku vyrostla průmyslová chlouba Brna a celého státu - několik firem zde vyrábí téměř třetinu světové produkce EM. Přitom se nejedná o zanedbatelné odvětví "high-tech" průmyslu, neboť představuje trh o velikosti asi 3,2 miliardy dolarů za rok a v příštích letech má růst více než 7% tempem - především díky poptávce rozvíjejícího se nanotechnologického průmyslu., Jan Valenta., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
34. Seismicity, groundwater level variations and earth tides in the Hronov-Poříčí Fault Zone, Czech Republic
- Creator:
- Kolínský, Petr, Valenta, Jan, and Gaždová, Renata
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, seizmicita, tlak vzduchu, seismicity, air pressure, Eastern Bohemian Massif, groundwater level, earth tides, 7, and 551
- Language:
- English
- Description:
- Local seismicity of the Hronov-Poříčí Fault Zone is studied using two-year continuous seismic data from four seismic stations in the area. Newly developed software for automatic seismic events detection is introduced - it is based on the method used at the Icelandic seismic network. Twelve major local earthquakes are detected, localized and their magnitudes are estimated. Simultaneously, groundwater levels are continuously monitored in three wells in the area. Multiple-filtering method, originally used for processing of broadband and dispersed seismic signals, is modified and used for the frequency-time analysis of the water level data. Dominant tidal influence on the groundwater level variations is shown. Theoretical tidal potential for all three well locations is computed. Groundwater data and tidal potential are bandpass filtered to focus on the semidiurnal periods. Mutual amplitude ratio and phase shift between both quantities are computed. Each of the three wells exhibits different pattern of the groundwater level variations with respect to tides. A distinct change in the phase shift is observed at the VS-3 well in the second half of 2009. In the same time span, increased seismic activity is also observed. However, other two wells do not exhibit any evidence of such phase shift. Detailed groundwater level data analysis does not prove any significant rises or drops of the groundwater levels in 28 day intervals around the detected local events. In contras t, unexplained groundwater level drop in the V-34 well is obser ved 18 hours before the teleseismic Tohoku earthquake, Japan, March 11, 2011, Mw = 9.0., Petr Kolínský, Jan Valenta and Renata Gaždová., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
35. Sjezd Jednoty českých matematiků a fyziků v Ostravě
- Creator:
- Valenta, Jan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- Jednota českých matematiků a fyziků, kongresy, congresses, 6, and 53
- Language:
- Czech
- Description:
- Sjezdy různých spolků, organizací či politických stran tradičně nebývají považovány za zvláště vzrušující události. Často se konají především proto, že je to tak napsáno ve stanovách - sjezd bývá nejvyšším "orgánem" spolku, který směruje vývoj na období do dalšího sjezdu. Tím spíše by se dala očekávat nezáživnost takové akce u spolku, který má v názvu matematiku a fyziku a vyčpělé slovo jednota. Sjedou se tam nejspíše postarší pánové a několik málo dam a vše jednotně odkývají prošedivělými kšticemi. Bylo tomu tak i letos v Ostravě na 19. sjezdu JČMF? and Jan Valenta.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
36. Sluneční záření a fotovoltaika
- Creator:
- Valenta, Jan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fotovoltaika, fyzika, sluneční záření, photovoltaics, physics, solar radiation, 6, and 53
- Language:
- Czech
- Description:
- Jan Valenta. and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
37. Střípky z dějin vědy a techniky v Československu
- Creator:
- Valenta, Jan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- dějiny vědy, history of science, 6, and 53
- Language:
- Czech
- Description:
- (jv).
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
38. Světélkování
- Creator:
- Valenta, Jan, Malý, Petr, and Hála, Jan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- Pelant, Ivan, fyzika, physics, 6, and 53
- Language:
- Czech
- Description:
- K sedmdesátým narozeninám prof. Ivana Pelanta, jehož činnost se točí především kolem luminiscenční a nelineární optické spektroskopie., Jan Valenta, Petr Malý, Jan Hála., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
39. Tectonic pattern of the Hronov-Poříčí trough as seen from pole-dipole geoelectrical measurements
- Creator:
- Valenta, Jan, Vladimír Stejskal, and Štěpančíková, Petra
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, geomorfologie, geomorphology, Hronov (Česko : oblast), Hronov Region (Czechia), Hronov-Poříčí Trough, Hronov-Poříčí Fault Zone, electric resistivity measurements, normal faulting, 7, and 551
- Language:
- English
- Description:
- The Hronov-Poříčí Trough represents the easternmost part of the Trutnov-Náchod Depression. The NW-SE striking structure was formed due to the post-Cretaceous flexural folding and is filled with the Upper Cretaceous sediments. Both the NE and SW margins of the trough are bounded by flexures with the Upper Cretaceous strata dipping 40-60° towards the axis of the trough. The NE flexure is situated close to the parallel Hronov-Poříčí Fault Zone. Up to now, it is not fully known, in what extent the normal faulting was involved in the evolution of the structure. From the geomorphological point of view, the normal fault constraints of the trough seem to be acceptable, as the surface topography of its present margins exhibit many signs typical for fault scarps. However, the existence of a fault system bounding all round the Hronov-Poříčí Trough has not b een proved by any geological research. Hence the geophysical research was carried out on both sides of the NW part of the trough to support one of these hypothesis. Five geoelectrical profiles were measured in the area and the fault system was proved on the NE side of the trough. On the SW boundary the fault system was not found. Thus it seems, that the NE boundary is controlled by fault tectonics, whereas the SW boundary is rather formed by a simple flexure., Jan Valenta, Vladimír Stejskal and Petra Štěpančíková., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
40. The identification of faults using morphostructural and geophysical methods: a case study from Strašín Cave site
- Creator:
- Hartvich, Filip and Valenta, Jan
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, jeskyně, caves, Šumava (pohoří : oblast), Šumava Mountains Region, geophysical profiling, morphostructural analysis, faults, 7, and 551
- Language:
- English
- Description:
- This paper combines morphostructural analysis and geophysical methods in order to link the faults monitored inside Strašín Cave with faults and lineaments in the vicinity of the cave. The studied site is situated in SW Bohemia, at the foothills of the Bohemian Forest Mts. Main goal is to combine the morphostructural, morphometrical and geophysical methods in order to identify the fault system, monitored inside the cave. This will allow relevant interpretation of the observed movements in the frame of the local tectonic environment. The results show that the monitored faults are observable in the geophysical profiles and, using our knowledge of the structural setting, we have been able to link them with mapped tectonic structures in the vicinity of the cave. Thus, it has been demonstrated that even where outcrops are absent, the faults can be traced and that the monitored faults are significant enough to yield relevant data on tectonic movements. In addition, the combined resistivity and gravimetry profiles reveal a possible new, presently unknown, cave located 20 m below the surface about 200 m northnortheast of Strašín Cave., Filip Hartvich and Jan Valenta., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public