Wyniki wyszukiwania - BazTech

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Kopalne dęby Quercus robur z pradoliny Odry we Wrocławiu - analiza geologiczna, paleobotaniczna i radiometryczna

Lorenc M. W., Chlebicki A.

Architektura Krajobrazu

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2008

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nr 3

12-21

EN

The geological profile of Quaternary deposits was excavated at the northern district of the city of Wrocław in an artificial ditch of about 200 m long and 6 m deep. Lower part of the profile, starting from the depth of 3,2 m below the surface down to the base of the ditch consisted of light-yellow sand with partly fragmented intercalations of plant debris (0,2 m thick) at the depth of 4,0 m. The lowermost bed of plant debris marks the same level in which numerous logs of sub-fossil oak (Quercus robur) were found. The excavations along the ditch revealed 22 such logs, the thickness of which is in rang of 0,4-1,4 m. They occurred at the depth of 3,9-5,4 m. Morphology, color and qualities of the sub-fossil wood were very good indicators of the changing conditions of the river transport and sedimentation. Among the dendrochronologically analyzed oak samples, two generations of different ages were recognized and local chronologies were produced. The first one was dendrochronologically dated against the Southern Poland oak standard to the period 1796-1526 BC. This dating is in perfect agreement with the earlier produced result of radiocarbon analysis 3180+/-50 BP. The second chronology (4890+/-60 BP and 5000+/-40 BP) indicate that the oaks of that generation grown at the end of the Atlantic Period. Radiocarbon dating also enabled identification of trunks older than 5000 BP (5580+/-40 BP and 5330+/-40 BP), as well as of an age intermediate between these both chronologies (4370+/-50 BP). The analyses carried out indicate that the analyzed profiles contain mostly oak trunks from the Atlantic and Subboreal periods. They enable dating of the youngest part of the alluvial series to around 1500 BC.

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A protocol for determination of natural radionuclides in the geothermal water

Bem H., Olszewski M., Kaczmarek A.

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa

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2004

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nr 1

94-95

3

Naturalne i sztuczne skażenia atmosfery globu.

Jaworowski Zbigniew

Wiadomości Chemiczne

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1999

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[Z] 53, 9-10

701-723

EN

Results of determination of natural radionuclides, fission products and heavy metals in contemporary and pre-industrial ice from 14 glaciers in Southern and Northern Hemisphere, and in aerosols collected during three decades from seven altitudes between o and 15 km in the troposphere and stratosphere, were used for determinations of fluxes of man-made and natural pollutants into the global atmosphere. For these determinations 137Cs from nuclear explosions and natural 210Pb were used as tracers. Concentrations of natural radionuclides and heavy metals in ice deposited before industrial revolution were higher than in contemporary precipitation preserved as firn in high mountain and polar glaciers. This was due probably to volcanic activity which was higher before the first part of the 20th century. Man-made contribution to the total atmospheric flux is now 3,5% for 226Ra, 12% for U, 7,4% for Pb. 0,11% for Cd, 62% for V and 5,8% for Hg. The mass of annual global wet precipitation, determined for the first time with radioactive tracers, is 5,7ˇ10(17) kg. In Poland, the lowest concentration of stable lead in human bones is now in highly industrialized southern districts. Lead level in medieval human bones from these districts reached up to 370ug/g. Its current average level in inhabitants of southern Poland is 3,5 ug/g, i.e. similar as 1800 years age.

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Charakterystyki radiometryczne miejskich terenów nadmorskich w rejonie Rzymu na podstawie optycznych i radarowych zobrazowań satelitarnych

Kowalewska-Kalkowska H.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

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1998

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Nr 4

115-141

EN

Landsat Thematic Mapper optical and ERS-1 SAR (image mode) radar data were analysed and compared to estimate their suitability to detect different types of land surface of the Roman urban and rural countryside area. Preliminary analysis of SAR data showed that speckle noise must be removed before radiometric analysis has been done. Radiometric analysis of such transformed data showed that the lowest values correspond to water, the highest to heterogeneous, urban areas; in the middle part of range are vegetated, homogeneous surfaces. Radiometric analysis of TM (1-4 wavebands) showed that it is very difficult to distinguish different types of land surfaces from raw data. Good results are obtained from NDVI map, where the lowest values of NDVI correspond to water, the highest to areas with dense vegetation. After the radiometric analysis and comparison of SAR and TM images has been done it seems to be possible to classify Roman urban and rural surfaces among three types: vegetated, unvegetated and water ones.