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    Wyświetlanie 1-9 z 9
    Tytuł:
    Bulk chemical composition of Sołtmany chondrite
    Autorzy:
    Przylibski, T. A.
    Łuszczek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411498.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    meteorite
    ordinary chondrite
    L-chondrite
    bulk composition
    meteorite fall
    observed fall
    Opis:
    The authors examined the bulk chemical composition of the Sołtmany chondrite which fell on April 30th, 2011 in Northern Poland. Based on the analysis of 47 elements, it was concluded that Sołtmany is representative of L-type of ordinary chondrites. However, compared to the average values observed in other L-type ordinary chondrites, Sołtmany displays higher content of Ni, P, Cd, Pb, and As. The Ni and P content closely resembles typical values for H-type ordinary chondrites. Furthermore, Sołtmany displays other distinct properties including very low Zn content and lower contents of Mo and Zr than the average values found in other L-type ordinary chondrites. Consistent with other L-type ordinary chondrites, the absolute content of REE in Sołtmany is higher than that of CI-type carbonaceous chondrites while the REE trend lines for both Sołtmany and CI-chondrites are similar. Due to similar times of year of when both falls took place and the proximity of their strewn fields, the chemical composition of Sołtmany was compared with that of Jesenice, an L6 ordinary chondrite which fell on April 9th, 2009 in Europe. The analysis led to a conclusion that Sołtmany and Jesenice are not launch-paired. Nevertheless, even though they do not represent fragments of the same meteoroid, their origin on a common parent body (an asteroid – planetesimal) cannot be conclusively ruled out on the sole basis of their bulk chemical composition.
    Źródło:
    Meteorites; 2012, 2, No. 1-2; 31-37
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected processes in acidulous waters from Swieradów Zdrój in the light of the results of chemical analyses over the last thirty years
    Wybrane procesy w szczawach Świeradowa Zdroju w wietle wyników analiz chemicznych z ostatnich trzydziestu lat - 100
    Autorzy:
    Przylibski, T. A.
    Kozlowski, J.
    Kabat, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/191294.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Opis:
    In this paper the variability of chemical composition of Swieradów Zdrój acidulous waters for over thirty years is presented. Attempts were made at the interpretation of some noticeable effects occuring in these waters. Irregular fluctuations of free carbon dioxide content in acidulous waters (waters contained more than 1000 mg/dm3 of free CO2) and the lack of a general trend in its changes, as well as slow and constant decrease of total dissolved solids (TDS) in shallow intakes should be underlined. TDS changes in time are the result of various stages of deep circulation waters mixing with slightly mineralized shallow waters. To a certain extent, these changes may depend on the chemical composition changes of deep circulation acidulous waters. Correlation of the TDS changes in time with the variability of some ions concentration (mainly HCO3-, Ca2+, rarely Mg2+, K+) testifies to the origins of these ions from dissolution of rocks by acidulous waters of deep circulation. The origin of other ions should be connected with shallow circulation waters and with deep circulation acidulous waters as well. The lack of correlation between free carbon dioxide contents and concentration of hydrogen carbonate ion as well as lack of correlation between pH and CO2 and HCO3- concentration has not been explained yet and requires further research.
    W pracy przedstawiono zmienność składu chemicznego szczaw Świeradowa Zdroju na przestrzeni ostatnich trzydziestu kilku lat. Podjęto także próbę interpretacji niektórych z zaobserwowanych zjawisk zachodzących w tych wodach. Na szczególne podkreślenie zasługuje stwierdzenie nieregularnych wahań zawartości wolnego dwutlenku węgla w szczawach oraz brak generalnego trendu jej zmian, a także powolny, stały spadek mineralizacji ogólnej w płytkich ujęciach. Korelacja zmian mineralizacji ogólnej (TDS) w czasie ze zmiennością stężeń niektórych jonów świadczy o pochodzeniu tych jonów z rozpuszczania skał przez szczawy głębokiego krążenia. Brak korelacji pomiędzy zawartością wolnego dwutlenku węgla a stężeniem jonu wodorowęglanowego nie został wyjaśniony i wymaga dalszych badań.
    Źródło:
    Annales Societatis Geologorum Poloniae; 1998, 68, 1; 95-103
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermophysical properties of the Sołtmany meteorite
    Autorzy:
    Szurgot, M.
    Wach, R. A.
    Przylibski, T.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411496.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    chondrite
    differential scanning calorimetry (DSC)
    specific heat capacity
    thermal capacity
    thermal diffusivity
    thermal conductivity
    Opis:
    Bulk density, porosity and thermophysical properties of the Sołtmany meteorite have been determined. The mean bulk density of the meteorite is 3.475‧103kg/m3, mean bulk density of the crust is 4.3‧103 kg/m3, grain density 3.71‧103 kg/m3, and porosity 6.4 ±} 0.4%. Mean specific heat capacity determined by DSC in temperature range between 223 and 823 K increases from 595 to 1046 J/(kg‧K), and is equal to 728 J/(kg‧K) at room temperature. Specific heat capacity of various samples is in the range 705–769 J/(kg‧K) at room temperature. Thermal capacity of Sołtmany chondrite is equal to 2.53‧106 J/(m3‧K), thermal diffusivity (1.5–1.8)‧10-6 m2/s, and thermal conductivity 3.9–4.5 W‧m–-1‧K-1at room temperature. Differential scanning calorimetry revealed two reversible phase transitions in the Sołtmany’s troilite: α/β transition at 423 K, and β/γ transition at 596.6 K.
    Źródło:
    Meteorites; 2012, 2, No. 1-2; 53-65
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primitive enstatite achondrites
    Autorzy:
    Pilski, A. S.
    Przylibski, T. A.
    Łuszczek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411494.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Acapulcoite
    lodranite
    winonaite
    brachinite
    ureilite
    metachondrite
    primitive achondrite
    enstatite chondrite
    primitive enstatite achondrite
    Opis:
    Conclusions drawn from the breadth of analytical data on primitive achondrites and enstatite chondrites paired with results of research performed by the authors have led the authors to propose the establishing of a new group of meteorites: primitive enstatite achondrites. The group is defined as the residual remaining after the partial melting of their protolith, which, in the case of primitive enstatite achondrites, is the parent body of enstatite chondrites. In this article are characterized textural features and characteristics of their mineral, chemical, and isotopic composition. The most important of these defining features are the presence of relic chondrules and/or triple junctions of crystal faces, as well as characteristic atomic and molar ratios of main elements: Si, Al, Fe, Mg, Mn and Ca, and particularly the molar ratios Fe/Mn and Fe/Mg. Another important characteristic is the isotopic composition of entrained noble gases, especially ratios of the heaviest of the isotopes and oxygen isotopes, whose values should be close to that typical for enstatite chondrites. It seems likely that the first meteorite to be classified as primitive enstatite achondrite will be the Zakłodzie enstatite achondrite.
    Źródło:
    Meteorites; 2011, 0, 0; 9-21
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of the Baszkówka and Mt. Tazerzait chondrites: genetic conclusions based on astrophysical data and the mineralogical and petrological data
    Autorzy:
    Pilski, A. S.
    Przylibski, T. A.
    Zagożdżon, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059300.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    meteorites
    chondrites
    solar system
    asteroids
    asteroid-collisions
    Opis:
    The L5 chondrites Baszkówka and Mt. Tazerzait are characterised. Their astronomical, mineralogical and petrological characteristics confirm that these meteorites are similar. They could be derived from the same parent body, though from the different depths below its surface. A third meteorite - the Tjerebon - might have arisen from the same swarm of meteoroids. The parent body to these meteorites in the asteroid belt can not be established at present. The porosity, of these chondrites suggests that they formed close to the surface of their parent asteroid. The process of formation of the parent rock of the Baszkówka chondrite is similar in some respects to sedimentation of a weakly compacted terrestrial sandstone. Thus, a two-stage geological history may be envisaged: firstly formation of the component minerals and mineral aggregates of this meteorite. Then, later in a different environment, the accretion of fragments of this parent material, together with a small amount of matrix, into a strongly porous sedimentary rock.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 331-342
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uranium, radium and radon isotopes in selected brines of Poland
    Autorzy:
    Kozłowska, B.
    Walencik, A.
    Przylibski, T. A.
    Dorda, J.
    Zipper, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148912.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium
    radium
    radon
    brines
    Opis:
    Natural radioactive isotopes were studied in nine different types of brines from four locations in Poland. Investigated brines are exploited from various geological structures composed of the rocks of different chemical and mineral composition as well as different age and depth. All investigated brines are used in balneotherapy (i.e. baths, inhalations, showers). The main goal of this study was to obtain some basic knowledge on the activity range of natural elements such as uranium, radium and radon in different brine types in Poland and their variability depending on their location in certain geological structures. Activities of 234,238U, 226,228Ra and 222Rn isotopes were measured with the use of two nuclear spectrometry techniques: liquid scintillation and alpha spectrometry. The activity concentrations of 222Rn vary from below 1 to 76.1 plus or minus 3.7 Bq/l, for the 226Ra isotope from 0.19 plus or minus 0.01 to 85.5 plus or minus 0.4 Bq/l and for 228Ra from below 0.03 to 2.17 plus or minus 0.09 Bq/l. For uranium isotopes, the concentrations are in the range from below 0.5 to 5.1 plus or minus 0.4 mBq/l for 238U and from 1.6 plus or minus 0.4 to 45.6 plus or minus 2.0 mBq/l for 234U. The obtained results indicate high radium activity concentrations corresponding to high mineralization of waters.
    Źródło:
    Nukleonika; 2010, 55, 4; 519-522
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural radioactivity of groundwater from the Przerzeczyn-Zdrój Spa
    Autorzy:
    Walencik, A.
    Kozłowska, B.
    Przylibski, T. A.
    Dorda, J.
    Zipper, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148493.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    radium
    uranium
    groundwater
    medicinal water
    Opis:
    The present authors performed investigations of natural radioactivity in groundwater from the Przerzeczyn- -Zdrój Spa. Some of the waters are regarded as medical and are used for balneological purposes. Samples from seven groundwater intakes were collected 5 times over a period of 8 years (1999–2007). In order to obtain necessary data, two different nuclear spectrometry techniques were applied: α spectrometry and liquid scintillation spectrometry. The activity concentrations of 222Rn varied in the range from 15±2 Bq/l to 154±22 Bq/l. The results of activity concentrations of 226,228Ra varied from below 10 mBq/l to 30±1.5 mBq/l and from below 30 mBq/l to 60±4 mBq/l, respectively. Activity concentration lower than minimum detectable activity (MDA) was obtained for 3 samples for 226Ra and 4 for 228Ra determinations out of 7 investigated samples. The uranium content in the studied samples was determined once and the value ranged from 4.5±0.6 mBq/l to 13.6±1.2 mBq/l for 238U and from 17.1±0.9 mBq/l to 52.2±2.8 mBq/l for 234U. All obtained values for uranium isotopes showed activity concentrations above MDA. The activity ratios 234U/238U, 222Rn/226Ra and 226Ra/238U and the correlations between different isotopes concentrations were evaluated.
    Źródło:
    Nukleonika; 2010, 55, 2; 169-175
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Northwest Africa 7915: A New approved LL5 chondrite from Morocco
    Autorzy:
    Brawata, M.
    Kryza, R.
    Jakubowski, T.
    Przylibski, T. A.
    Ćwiąkalski, J.
    Łuszczek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411506.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    chondrite
    NWA 7915
    Morocco
    chondrule
    chondrite chemistry
    chondrite weathering
    Opis:
    A 415 g single meteorite was purchased in 2010 by T. Jakubowski from a dealer in Morocco. The meteorite was isometric in shape, ca. 8 cm in size, with distinct regmaglypts on the original ablated surface, and covered mostly in primary crust with one broken surface. The weight of the sample studied was 69 g. The meteorite is composed of several types of chondrules including porphyritic-Ol-Px, barred-Ol, radial-Px, granular and cryptocrystalline with distinct and diffused (not sharp) boundaries, and opaque grains and aggregates, enclosed in a very fine-grained matrix. The average compositions of minerals are: olivine (both in chondrules and matrix) − Fo70.4Fa29.1Te0.5, pyroxenes, represented by Mg-Fe (Ca-poor) orthopyroxene (and minor clinopyroxene?) − En73.9Fs24.1Wo2.0, feldspars (small in the matrix and in barred chondrules), with An12-37, and Or~3-4, taenite − Fe 70.80, Ni 25.50 and Co 1.67 wt. %, troilite − Fe0.98S1.00, chromite (Fe2+ 0.96Mg0.12Mn0.01Zn0.01) (Cr1.52Al0.23Fe3+ 0.02Ti0.10Si0.02)O4; altered accessory minerals including apatite and iron-rich secondary phases have also been identified and analyzed. The meteorite is of petrologic type 5, as evidenced by the observed recrystallization of the matrix, relatively good preservation of the chondrule structures, homogeneous composition of olivine and pyroxene, and the presence of only secondary small feldspar grains. The shock stage, S2, is based on the presence of undulatory extinction and irregular fractures in olivine crystals. The weathering grade, W3, is confirmed by the observation that kamacite is totally altered into secondary iron phases, whereas Nirich taenite, and troilite are only partly weathered. The specimen shows many bulk- and mineral-chemical parameters corresponding, mostly, to the LL chondrite group (e.g., Fe/SiO2 0.49, SiO2/MgO 1.62, Fa in olivine 29.05). However, concentrations of several other elements, including REE, are not fully consistent with the average values for the LL ordinary chondrites. Apparently, the parent body of the studied NWA 7915 meteorite was depleted in Dy, Tm, and Yb, compared to typical LL-type ordinary chondrite parent bodies. Also, relatively high concentrations of other elements, including Ba and Sr, have been measured, which may result from terrestrial weathering in hot desert conditions. The meteorite has been classified as LL5 ordinary chondrite, S2, W3, and registered in the Meteoritical Society database as NWA 7915. The type specimen is deposited in the Mineralogical Museum of the University of Wrocław.
    Źródło:
    Meteorites; 2014, 3, No. 1-2; 45-58
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intercomparison of radon CR-39 detector systems conducted in CLORs calibration chamber
    Autorzy:
    Mamont-Cieśla, K.
    Stawarz, O.
    Karpińska, M.
    Kapała, J.
    Kozak, K.
    Grządziel, D.
    Chałupnik, S.
    Chmielewska, I.
    Olszewski, J.
    Przylibski, T. A.
    Żebrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148842.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon-222
    CR-39 track detector
    intercomparison
    RadoSys
    Opis:
    Six radon laboratories, which perform indoor radon measurements to jointly investigate temporal variations of radon concentration in houses in a couple of regions in Poland, participated in the intercomparison exercise. There are involved three commercially available Hungarian RadoSys systems and four own laboratory methods. All of them are based on the etched-track CR-39 detectors. The intercomparison was conducted in a calibration laboratory of the Central Laboratory for Radiological Protection (CLOR), Warsaw, Poland, accredited by the Polish Center for Accreditation (previously AP 101, at present AP 057). Comparison measurements were performed during three expositions in the CLOR’s radon calibration chamber under controlled normal climatic conditions and steady radon concentration. The results were referred to the value of the radon concentration determined by AlphaGUARD monitor traceable to the primary 222Rn standard in Physikalisch-Technische Bundesanstalt (PTB), Braunchweig, Germany. The mean performance ratio defined as a ratio of the reference to participant’s result range from 0.88 to 1.31.
    Źródło:
    Nukleonika; 2010, 55, 4; 589-593
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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