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31.
Jerzy Nawrocki 《地学学报》2004,16(3):139-145
Some stratigraphic interpretations concerning correlation of the Permian–Triasssic transition beds from the Central European, Boreal and Tethyan Basins are inconsistent with the existing magnetostratigraphic data. In addition, the suggestion that the Permian–Triassic boundary is located in the lower part of the Calvörde Formation of the Central European Basin cannot be supported by magnetostratigraphic data. Results of magnetostratigraphic correlation show that in the Polish part of the Central European Basin the Permian–Triassic boundary is close to the boundary between the uppermost Zechstein and the Lower Buntsandstein. It is located within the reversed magnetozone ‘PZr1’ identified in the upper part of the Rewal Formation. In the German part of the Central European Basin the Permian–Triassic boundary can be located within the reversed magnetozone ‘zrz’ that covers most of the Bröckelschiefer. A higher stratigraphic location of this boundatry, i.e. inside the lowermost Buntsandstein, requires a reversed polarity record to be found within the basal Triassic normal polarity zone. 相似文献
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Leszek R. Jaroszewicz Zbigniew Krajewski Henryk Kowalski Grzegorz Mazur Paweł Zinówko Jerzy Kowalski 《Acta Geophysica》2011,59(3):578-596
We outline the research leading to development of the Autonomous Fibre-Optic Rotational Seismograph (AFORS) and describe the
final version of the instrument. The instrument with linear changes of sensitivity keeps accuracy from 5.1 × 10−9 to 5.5 × 10−8 rad/s in the detection bandpass 1.66–212.30 Hz; it is designed for a direct measurement of rotational components emitted
during seismic events. The presented system is based on the optical part of the fibre optic gyro construction where a special
autonomous signal processing unit (ASPU) optimizes its operation for the measurement of rotation motions instead of the angular
changes. The application of a newly designed telemetric system based on the Internet allows for a remote system control, as
shown in an example of the system’s operation in Książ (Poland) seismological observatory. 相似文献
35.
Gerald Matisoff Michael E. KettererKlas Rosén Jerzy W. MietelskiLauren F. Vitko Henning PerssonEdyta Lokas 《Applied Geochemistry》2011,26(1):105-115
Vertical profiles of 137Cs and 239,240Pu were measured in soils collected from two sites in southern Sweden and three sites in southern Poland and were modeled using both a solute transport model and a bioturbation model to better understand their downward migration. A time series of measured 137Cs profiles indicates that 137Cs from Chernobyl was found at the soil surface in 1986 but it has migrated progressively downward into the soil 4.5-25.5 cm since. However, because of dispersion during the migration and mixing following Chernobyl deposition and the much higher activities of 137Cs from Chernobyl, stratospheric fallout of 137Cs from the 1960s cannot be identified as a second 137Cs activity maximum lower in the soil column at any of the sites. Conversely, the 240Pu/239Pu ratio indicates that no Chernobyl-derived Pu is present in any of the cores with the exception of one sample in Sweden. This difference may be attributed to the nature of the release from Chernobyl. Cesium volatilized at the reactor temperature during the accident, and was released as a vapor whereas Pu was not volatile and was only released in the form of minute fuel particles that traveled regionally. Both the solute diffusion and the bioturbation models accurately simulate the downward migration of the radionuclides at some sites but poorly describe the distributions at other sites. The distribution coefficients required by the solute transport model are about 100 times lower than reported values from the literature indicating that even though the solute transport model can simulate the profile shapes, transport as a solute is not the primary mechanism governing the downward migration of either Cs or Pu. The bioturbation model uses reported values from the literature of the distribution coefficients and can simulate the downward migration because that model buries the fallout by placing soil from depth on top and mixing it slightly throughout the mixing zone (0.6-2% per year of mixing). However, mixing in that model predicts concentrations in the top parts of the soil profiles which are too high in many cases. Future progress at understanding the downward migration of radionuclides and other tracers will require a more comprehensive approach, combining solute transport with bioturbation and including other important soil processes. 相似文献
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The investigated rock material belongs to the group of upper cretaceous quader sandstones which are very important construction stones in Poland and Germany. The mineral composition of the rocks is relatively uniform??they are quartzose sandstones. The most important feature is their good workability and comparatively high weathering resistance. Still, regardless of the apparent resemblance, the observations carried on buildings and monuments show differences in weathering processes. The undertaken test was an attempt to verify the proposed before rock classification, performed on the basis of parameterization of porosimetric cumulative intrusion volume curves. The aim of the experiment was the evaluation of the sandstone petrography (including the structure, texture and porosity of the rock) influence on the weathering process. The modelling of accelerated weathering was conducted in Chamber for Ageing Acceleration, where some weather circumstances were simulated (insolation, rain and frost). As the result of the weathering experiment it could be stated that the dominant mechanism of the sandstones deterioration was granular disintegration and weight loss as a consequence of sample destruction. The most important factor influencing rock deterioration is rock texture, especially the character of grain contacts. The effective porosity is a requisite of potential for the stone to take in and hold water, and hence of resistance to weathering. In case of silica-cemented sandstones, the deciding criterion influencing weathering resistance is pore structure. In case of sandstones with clay cement, the most important is mineral composition of the rock. 相似文献
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Joanna Dzido Agnieszka Kijewska Magdalena Rokicka Agnieszka Świątalska-Koseda Jerzy Rokicki 《Polar Science》2009,3(3):207-211
The aim of this study is to extend our knowledge of the distribution of anisakid nematode parasites in Arctic and Antarctic polar regions. We examined vertebrate (fish) taxa characteristic of the faunas in both polar regions for the presence of parasitic nematodes. The material was collected from Svalbard (Arctic) between July and August 2008 and from King George Island (South Shetland Islands, Antarctic Peninsula) between November 2007 and January 2008. In addition, faecal, bird, and invertebrate samples were collected and examined for the presence of anisakid nematodes or eggs. Anisakis simplex s.s. was found in the body cavity of Arctic cod, and Contracaecum sp. and Pseudoterranova sp. were found in Antarctic notothenioids. Eggs of Anisakis sp. and Contracaecum sp. were recovered from the faeces of Mirounga leonina. We present the first record of the occurrence of A. simplex C in the Antarctic fishes Notothenia coriiceps and Notothenia rossii. 相似文献
40.
Stable 18O and 13C isotope records of Viviparus diluvianus (Kunth, 1865) shells from Holsteinian (MIS 11) lakes of eastern Poland as palaeoenvironmental and palaeoclimatic proxies
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Marcin Szymanek Krzysztof Bińka Jerzy Nitychoruk 《Boreas: An International Journal of Quaternary Research》2016,45(1):109-121
The oxygen and carbon stable isotope composition of Viviparus diluvianus shells was determined in the palaeolakes of the Holsteinian interglacial (MIS 11) in eastern Poland: the Ortel Królewski, Hrud, Ossówka, Roskosz and Szymanowo lakes. The occurrence of V. diluvianus covers the Taxus zone, the so‐called intra‐interglacial cooling period (Pinus‐Larix zone), the climatic optimum (Carpinus‐Abies zone) and the post‐optimal period with an undefined pollen zone. The isotope record of V. diluvianus shells allowed palaeoclimate and palaeoenvironmental reconstructions. δ18O and δ13C vary from −8.7‰ in the post‐optimal period to −4.8‰ in the optimal period, and from −10.6‰ at the beginning of the Taxus zone to −4.2‰ at the climatic optimum, respectively. A positive correlation of the isotope curves indicates closed‐water bodies, and only at Roskosz was some occasional overflow inferred. Higher oxygen isotopes correspond to an increase in temperature and/or enhanced evaporation, which is well marked in the Carpinus‐Abies zone, whereas samples enriched in 13C are correlated with periods demonstrating a lower water level and higher productivity in the lakes. Episodes of lake shallowing and dense aquatic vegetation occurred in the Pinus‐Larix zone and during the climatic optimum. The isotope ratios for the climatic optimum significantly exceed those of the other periods, thus pointing to warmer conditions. An estimation of relative changes of average summer temperatures using the δ18O/temperature gradient yielded variation of 1–2 °C within the lakes. Absolute temperature reconstructions indicate the effects of specific local conditions. Hence, V. diluvianus shells offer a reliable proxy in qualitative studies of interglacial lake records. 相似文献