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    Wyświetlanie 1-15 z 15
    Tytuł:
    Effect of Alloying with Ca in LaMnO$\text{}_{3}$ System Studied by KKR-CPA Method and Giant Magnetoresistance
    Autorzy:
    Tobola, J.
    Kaprzyk, S.
    Pierre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964825.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    Opis:
    La$\text{}_{1-x}$ Ca$\text{}_{x}$MnO$\text{}_{3}$ perovskites show semiconducting properties in the paramagnetic range. The gap is reduced near x=0.33, where ferromagnetic ordering is observed. The ferromagnetic ordering then induces a semiconductor-metal transition, and gives rise to a giant magnetoresistance effect. The ground state electronic structure calculations were done with KKR-CPA method for hypothetical cubic and ferromagnetic LaMnO$\text{}_{3}$ and CaMnO$\text{}_{3}$ compounds, as well as for disordered La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ (x=0.33, 0.4, 0.5) alloys with real crystal data. As a result, we get a magnetic moment per formula 4.00μ$\text{}_{B}$ and 3.00μ$\text{}_{B}$ and half-metallic behaviour for end-compounds, respectively. In the ferromagnetic region a linear decrease in the magnetic moment of La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ is observed, together with the decrease in the gap width for spin-down carriers, if doping Ca in La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$. A simple model is developed, which describes magnetic and transport properties as resulting from an exchange-induced band-crossing semiconductor-metal transition, as for instance in EuO.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 461-464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay of Crystal Structure Preference and Magnetic Ordering in High Entropy CrCoFeNiAl Alloys
    Autorzy:
    Jasiewicz, K.
    Kaprzyk, S.
    Tobola, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030461.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Nc
    71.20.Be
    71.23.-k
    75.50.Bb
    Opis:
    In this work, some relations between crystal structure and magnetic ordering in CrCoFeNiAl HEAs are discussed in view of the KKR-CPA calculations. Remarkably, it is noticed that the transition between fcc and bcc phases in the analysed CrCoFeNi_{x}Al and CrCoFeNiAl_{x} alloys is closely related to change in ordering of the local magnetic moments, namely the magnetic moment on Cr is either parallel (ferromagnetic) or antiparallel (ferrimagnetic) to the magnetic moments of other atoms (Co, Fe and Ni). On the whole, the theoretical diagram showing the fcc-bcc phase preference and their coexistence vs. alloy composition well corroborates with available experimental data.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 511-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of Substitution of Si for Ge in Mn$\text{}_{5}$Ge$\text{}_{3}$
    Autorzy:
    Siberchicot, B.
    Henrion, R.
    Toboła, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956494.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    75.50.Cc
    75.10.Lp
    Opis:
    The substitution of silicon for germanium in Mn$\text{}_{5}$Ge$\text{}_{3}$ leads to a decrease in the magnetization for x < 0.7 and then to phase transition toward a non-collinear antiferromagnetic order for Mn$\text{}_{5}$Si$\text{}_{3}$. The magnetic properties of Mn$\text{}_{5}$Ge$\text{}_{3}$ and Mn$\text{}_{5}$(Ge$\text{}_{0.5}$Si$\text{}_{0.5}$)$\text{}_{3}$ are analyzed by means of band structure calculations.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 467-470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Electronic Structure of the RMn$\text{}_{2}$Ge$\text{}_{2}$ (R = Ca, Y, La, Ba) Antiferromagnets
    Autorzy:
    Toboła, J.
    Malaman, B.
    Venturini, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013367.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.15.Nc
    75.20.En
    75.20.Hr
    75.50.Ee
    Opis:
    The electronic structure of the tetragonal RMn$\text{}_{2}$Ge$\text{}_{2}$ (R = Ca, Y, La, Ba) antiferromagnets is presented using the self-consistent Korringa-Kohn-Rostoker method. According to the neutron refinements, two types of collinear antiferromagnetic structure are taken into account: AF$\text{}_{1}$ for YMn$\text{}_{2}$Ge$\text{}_{2}$ and AF$\text{}_{2}$ for the other compounds. The calculated magnetic moments on Mn: 2.17μ$\text{}_{B}$ (YMn$\text{}_{2}$Ge$\text{}_{2}$), 2.84 μ$\text{}_{B}$ (CaMn$\text{}_{2}$Ge$\text{}_{2}$), 2.95 μ$\text{}_{B}$ (LaMn$\text{}_{2}$Ge$\text{}_{2}$), and 3.47 μ$\text{}_{B}$ (BaMn$\text{}_{2}$Ge$\text{}_{2}$) remain in good agreement with the neutron data (in μ$\text{}_{B}$) 2.20, 2.67, 3.05, and 3.66, respectively. As seen on antiferromagnetic density of states, all systems are metallic, however BaMn$\text{}_{2}$Ge$\text{}_{2}$ is found near semimetallic limit. The total energy Korringa-Kohn-Rostoker computations on CaMn$\text{}_{2}$Ge$\text{}_{2}$, performed in both antiferromagnetic phases, result in preferring of the AF $\text{}_{2}$ structure.zap
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 761-765
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $\text{}^{119}$Sn Hyperfine Fields in RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, Hf). Experimental and Theoretical Study
    Autorzy:
    Mazet, T.
    Toboła, J.
    Venturini, G.
    Malaman, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013348.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Jx
    76.30.Lh
    71.15.Mb
    75.20.En
    Opis:
    We performed both $\text{}^{119}$Sn Möossbauer experiments and electronic structure calculations using the Korringa-Kohn-Rostoker method on the hexagonal RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, and Hf) compounds. According to previous neutron diffraction results two types of commensurate magnetic order are investigated: ferromagnetic for R = Mg and antiferromagnetic for R = Zr and Hf. From $\text{}^{119}$Sn Möossbauer measurements, high transferred hyperfine fields on the tin nuclei are observed. The H$\text{}_{hf}$ values are well supported by the Korringa-Kohn- Rostoker results. Moreover, the calculated μ$\text{}_{Mn}$ are in good agreement with the neutron diffraction data. When observing the density of states, ZrMn$\text{}_{6}$Sn$\text{}_{6}$ is found near semimetallic limit.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 737-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity, Weak Itinerant Ferromagnetism and Electronic Band Structure of Y$\text{}_{9}$Co$\text{}_{7}$
    Autorzy:
    Kołodziejczyk, A.
    Wiendlocha, B.
    Zalecki, R.
    Toboła, J.
    Kaprzyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047310.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Jb
    74.25.Ha
    74.20.Mn
    Opis:
    The paper presents experimental results for the intermetallic compound Y$\text{}_{9}$Co$\text{}_{7}$ which is the first very weak itinerant ferromagnetic superconductor. The measurements of electrical resistivity, susceptibility, magnetization, specific heat, nuclear magnetic resonance, and other properties show the magnetic transition at T$\text{}_{C}$≈ 4.5 K and the onset of superconductivity at about T$\text{}_{S}$≈ 2.5 K, revealing the coexistence state within a temperature interval below T$\text{}_{S}$. A few of the results are shortly reviewed and discussed. We focus attention on our recent ultraviolet photoemission spectroscopy and their comparison with our band structure calculations. Interpretations are considered which take into account the characteristic structure of the compound and different possible types of magnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 513-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Properties of MnRhAs$\text{}_{1-x}$p$\text{}_{x}$ and Band Structure Results from KKR-CPA
    Autorzy:
    Zach, R.
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956499.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    The magnetoelastic phase transitions were observed in MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (space group P6̅2m) by X-ray measurements (80 K < T < 300 K). For x = 0.33 and x = 0.4 contents an abrupt change of both lattice parameters and of the elementary cell volume at the metamagnetic transition was detected. The Korringa-Kohn-Rostoker electronic structure calculations performed for MnRhP compound show significant variations of densities of states at the Fermi level, while changing lattice data. The Korringa-Kohn- Rostoker-coherent potential approximation studies of disordered MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (x=0.6, 0.8, 1.0) were done at the ferromagnetic region. From our calculations we observe moving of bands near E$\text{}_{F}$, while substituting with isoelectronic metalloid, likely as while changing the crystal data in MnRhP.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 471-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Transport Properties of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in View of KKR-CPA Results
    Autorzy:
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956503.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    We present results of the electronic structure study for the solid solution (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P (space group P6̅2m). The samples were synthesized for x=0.0 up to 0.15. From the electrical conductivity measurements on these materials, it was verified that resistivity increases with increasing temperature up to the Curie point T$\text{}_{C}$ and changes the slope at T$\text{}_{C}$ decreasing when temperature is raised above T$\text{}_{C}$. To get insight into the possible origin of such observations, we carried out the Korringa-Kohn-Rostoker-coherent potential approximation electronic structure calculations for (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in the range of concentration x=0.0 up to 1.0. It was found that alloying with Ni in Fe$\text{}_{2}$ P causes vanishing of spin band splitting and non-rigid band behaving of electronic valence states near the Fermi level. The polarization factor for electrons at E$\text{}_{F}$ changes in (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P with increasing x, and interestingly, it reaches maximum at x=0.1, closely to the concentration (x=0.08), when the largest value of T$\text{}_{C}$ and a kink in temperature dependent resistivity were detected.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 475-478
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase transitions in the borate minerals from the Kłodawa Salt Dome (Central Poland) as the indicators of the temperature processes in salt diapirs
    Autorzy:
    Wachowiak, J.
    Toboła, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060065.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    boracite
    congolite
    phase transitions
    temperature study
    Zechstein
    salt dome
    Kłodawa
    Polska
    Opis:
    The diapiric structures of the Polish Lowlands are tectonically deeply seated down to the autochthonous Zechstein strata at a depth of ca. 6 km. In the process of deep burial and halokinetic diapirism, the salt rocks were subjected to diagenetic and metamorphic transformations, with the temperature being an essential factor. Considering the thermal gradient, a temperature of up to ca. 200°C can be achieved in the salt dome within a depth range from several hundred metres to 6 km, which may lead to transformations of the majority of salt minerals. Phase transitions of two borate minerals – boracite and congolite from the Kłodawa salt dome – provide evidence for higher temperatures in the salt dome rocks. The authigenic euhedral crystals of those borate minerals display their external habitus in ambient temperature in the form of regular symmetry (F43c – pseudo-regular polyhedrons), whereas their internal structure is lower: orthorhombic (Pca21) for boracite and rhombohedral (R3C) for congolite. The heating and cooling of boracite and congolite crystals show reversible phase transition. At a temperature of ca. 270°C, boracite crystals change their symmetry: orthorhombic ↔ cubic. In the case of congolite three reversible phase transitions within a temperature range of 50–339°C can be observed: rhombohedral ↔ monoclinic ↔ orthorhombic ↔ cubic symmetry. Those phase transitions, confirmed experimentally in our study, clearly document at least local occurrences of temperatures exceeding 339°C in the Kłodawa salt dome.
    Źródło:
    Geological Quarterly; 2014, 58, 3; 543--554
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępne wyniki badań inkluzji w automorficznych kwarcach z nadkładu wysadu Wapna z otworu C1
    Preliminary results of fluid inclusions investigation in euhedral quartz crystals from overlying sediments of the Wapno Dome (C1 borehole)
    Autorzy:
    Toboła, T.
    Jaworska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2192125.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Stowarzyszenie Górnictwa Solnego
    Tematy:
    kryształy kwarcu
    inkluzje
    paleotemperatury
    basen cechsztyński
    quartz crystals
    inclusions
    paleothemperathures
    Zechstein basin
    Opis:
    W obrębie utworów piaszczystych nadkładu znajdującego się nad wysadem i czapą gipsową Wapna (woj. wielkopolskie) występują automorficzne kryształy kwarcu (AKK). Dokładnej analizie poddano AKK wyseparowane z piasków kwarcowych średnioziarnistych (reprezentujących utwory miocenu i najprawdopodobniej oligocenu). Materiał ten pozyskano z otworu C1 zlokoalizowanego w NW części czapy. W tym miejscu jest ona rozcięta głęboką na około 120 m rynną wypełnioną osadami kenozoiku. AKK wyróżniają się od ziaren piasku kwarcowego automorficznym kształtem (mają prawidłową postać odpowiadającą odmianie niskotemperaturowej) i wysokim, diamentowym połyskiem. Osiągają od 0,1 do 2 mm długości; przeciętnie ok. 0,5 mm. Jedynie w niektórych AKK zaobserwowano inkluzje fluidalne (ciekło-gazowe). Występują one w formie: 1/ pojedynczych osobników, bezładnie rozmieszczonych, 2/ zespołów gęsto upakowanych przebiegających w postaci pasm lub obszarów o nieregularnym zasięgu. Rozmiary inkluzji sięgają od kilku do około 30 μm. Pomiary mikrotermometryczne inkluzji wykazały wąski zakres ich temperatur homogenizacji w przedziale od 86,4 do 126,5°C, a w jednym przypadku 158,8°C. W AKK oprócz inkluzji fluidalnych, stwierdzono także w mniejszej ilości inkluzje wypełnione substancją organiczną.
    Within sandy sediments overlaying the Wapno Salt Dome and its cap-rock (Middle Poland) occur euhedral quartz crystals (signed AKK). Those AKK subjected to a thorough analysis were separated from middle-grained quartz sands (of Miocene and probable Oligocene age). This material was obtained from C1 bore-hole which is located at NW part of cap-rock. In this place the cap-rock is cut by deep (about 120 m) trough filled with Cenozoic sediments. The AKK differ from grains of sand by euhedral shape (they display normal shape corresponding to the low-temperature variety) and very intensive diamond shine. Their length vary from 0.1 to 2 mm with average about 0.5 mm. Fluid (liquid-gas) inclusions occur only in some AKK. They are in form: 1/ randomly distributed single fluid inclusions, 2/ belts or irregular areas of densely packed inclusions. The size of inclusions vary from a few to about 30 μm. The microthermometric measurements show homogenization temperatures in the range of 86.4 – 126.5°C and in one case 158.8°C. In addition to the fluid inclusions in a smaller amount in the AKK were found inclusions filled by organic matter.
    Źródło:
    Przegląd Solny; 2014, 10; 65--74
    2300-9349
    Pojawia się w:
    Przegląd Solny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence of high-temperature rock salt transformations in areas of occurrence of borate minerals (Zechstein, Kłodawa salt dome, Poland)
    Autorzy:
    Toboła, T. T.
    Wachowiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059366.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Zechstein
    salt deposit
    hydrothermal conditions
    borates
    fluid inclusions
    Opis:
    Occurrences of borate minerals in the Zechstein salt-bearing deposits of the Kłodawa salt dome (central Poland), and the manner of their development, suggest that the minerals were formed at high temperatures, that considerably exceed the temperature estimated from the thermal gradient (~180°C). Research on rock salt and potassium-magnesium salts containing congolite and boracite, respectively, are consistent with high-temperature processes of transformations affecting the salt rocks in certain sections of the salt dome. The chemical composition of, and daughter minerals occurring in, primary fluid inclusions in halite, originating from the congolite zone, indicated a very high proportion of potassium and magnesium in the brines from which the halite crystallised. The thermal transformations observed in inclusions indicate a halite crystallisation temperature exceeding 420°C. Anhydrite crystals, co-occurring with borate minerals, represent unique features as to the distribution and composition of solid and fluid inclusions. These features indicate crystallisation or recrystallisation in conditions that differed considerably from those typical of the salt dome, with the involvement of solutions of changing chemical compositions. The crystals contain multiple solid inclusions of transparent and non-transparent minerals, among which we have focused on carnallite. The relationships of carnallite with liquid and gaseous phases indicate, as in the congolite zone, migration of very highly concentrated brines with respect to potassium and magnesium, or even transport of carnallite in the form of melt (liquid). Measurements of fluid inclusion homogenization temperatures, within the range from 197.8 to 473.8°C, supported a high-temperature origin for these minerals in hydrothermal conditions.
    Źródło:
    Geological Quarterly; 2018, 62, 1; 134--145
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salinity of Quaternary sediments and halophytes at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
    Autorzy:
    Mościcki, W. J.
    Toboła, T.
    Zarzyka-Ryszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191501.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    salinity
    geoelectric electromagnetic survey
    penetrometer-based resistivity profiling
    botanical studies
    halophytes
    Starunia
    Carpathian region
    Ukraine
    Opis:
    Interdisciplinary geophysical, geochemical and botanical studies were performed to recognize the problem of salinity of Quaternary sediments in the place, where woolly rhinoceroses were discovered at the beginning of the 20th century. Geoelectric methods (high resolution geoelectric research with electromagnetic conductivity meter) enabled construction of maps of the distribution of conductivity of near-surface sediments. Variation of conductivity with depth was recognized with penetrometer-based geoelectric measurements. Measured conductivity mainly depends on the level of mineralization (salinity) of underground water filling the pores and voids of poorly consolidated Quaternary sediments and partly underlying Miocene strata. Several samples were taken from geological boreholes. The analysis of these cores enabled estimation of salt (chloride ion) content in the solid phase of sediments. This content varies from place to place and with depth in an unpredictable way. The highest values reached 8.5 wt%. Generally, on the basis of a qualitative comparison, the salinity data gained from sampled cores correlate with distribution of apparent conductivity obtained with geoelectric methods. Nevertheless, in some places there is a discrepancy between geophysical and geochemical data, especially for penetrometer versus borehole data. It may be partly explained by an unavoidable difference in location of the geological borehole and penetrometer site (technically this cannot be the same place). During botanical field studies a group of vascular plants growing on saline soils (halophytes) was found. Halophytes indicate a higher salt concentration in the soil. Their aggregations are extremely rare in the Carpathian region. The pattern of halophytes distribution reflected the presence of saline water sources, and their flows and soils affected by them. Generally, the distribution of halophytes showed a good correlation with the distribution of high-conductivity anomalies determined with the surface geoelectric survey.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 391-402
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Productivity of technical operating resources on farms associated in producer groups
    Autorzy:
    Szeląg-Sikora, A.
    Sikora, J.
    Malaga-Toboła, U.
    Tabor, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/101181.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    machine stock
    gross final production
    gross replacement value
    Opis:
    The objective of the study was comparative analysis of production and technical circumstances of the functioning of two producer groups aimed at pig production. A significant difference between the compared producer groups was observed, in the group from (G1) mean livestock size was 48.93 LU·ha-1 AL. Whereas in the second group (G2), the livestock was at the level of only 19.45 LU·ha-1 AL. Within the compared groups (G1; G2) a significant discrepancy between the number of some machines is noticeable, such as: manure spreader, seeder, rotary mower, collecting balers. Farms of the G2 group had more extensively equipped machine stocks and the difference primarily stems from the size of the cultivated area AL, since in the producer group of (G2) the mean AL value was 30.80 ha and only 17.30 ha in the second studied group (G1). The conducted detailed analysis allowed to demonstrate that the group from Pałecznica (G1) should be assessed as the better one in terms of the productivity of fixed resources. In this group, the fixed resource productivity index indicates, that 1.07 thousand PLN·ha-1 AL of the production value corresponds to 1 unit of fixed resource value, i.e. 1 thousand PLN·ha-1 AL, whereas in the compared G2 group, the value was over half lower.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2016, III/1; 685-695
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępna ocena właściwości reologicznych wybranych rodzajów soli kamiennej
    Preliminary evaluation of the rheological properties of selected types of salts
    Autorzy:
    Serbin, K.
    Toboła, T.
    Ślizowski, J.
    Lankof, L.
    Polański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2192112.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Stowarzyszenie Górnictwa Solnego
    Tematy:
    szybkość pełzania
    sole kamienne
    inkluzje fluidalne
    creep rate
    rock salt
    fluid inclusions
    Opis:
    Przedmiotem badań była analiza szybkości pełzania różnych typów soli kamiennych pobranych ze złóż Kosakowo, Sieroszowice oraz Mogilno. Rozpatrzono wpływ takich parametrów petrograficznych jak wielkość kryształów halitu, obecność inkluzji solankowo-gazowych, sposób rozmieszczenia anhydrytu i innych domieszek. Przeprowadzone badania nie wykazały wzrostu szybkości pełzania wraz ze wzrostem rozmiarów kryształów halitu co często sugerowane jest w literaturze. Nie zaobserwowano również istotnego wpływu inkluzji pierwotnych. Ze względu na liczną obecność anhydrytu i polihalitu w badanych próbkach w których występowały inkluzje pierwotne, kwestia ich wpływu na szybkość pełzania wymaga dalszych szczegółowych badań. Wpływ na wzrost szybkości pełzania niewątpliwie związany jest z obecnością inkluzji rozmieszczonych na granicach kryształów halitu.
    The aim of presented study was to analyse the creep rate of different types of rock salt taken from the Kosakowo, Sieroszowice and Mogilno salt deposits. Petrological parameters such as: size of halite crystals, the presence of liquid-gas inclusions, arrangement of anhydrite and others minerals impurities were taken into account. Research did not reveal correlation between the creep rate and the size of halite crystals, what is frequently suggested in a literature. Moreover, the presence of primary fluid inclusions did not influence on the creep rate. In view of numerous anhydrite and polihalite ingrowth in the samples where primary fluid inclusions occur, this issue needs further investigations. However, the increase of the creep rate is connected with the fluid inclusions distributed on the boundaries of halite crystals.
    Źródło:
    Przegląd Solny; 2016, 12; 127--135
    2300-9349
    Pojawia się w:
    Przegląd Solny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bitumen and salt contents within the Quaternary sediments at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
    Autorzy:
    Kotarba, M. J.
    Więcław, D.
    Toboła, T.
    Zych, H.
    Kowalski, A.
    Ptak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/191512.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    bitumen content
    chloride ion content
    Pleistocene
    Holocene
    Starunia palaeontological site
    Carpathian region
    Ukraine
    Opis:
    Geochemical studies were conducted on bitumen and salts saturating the Pleistocene and Holocene sediments from an abandoned ozokerite mine in Starunia. This location is noted for the discovery of remnants of a mammoth and three woolly rhinoceroses in 1907, and a nearly completely preserved rhinoceros carcass in 1929. The bitumen (oil) and brines (chloride ions) were preserving agents for the large Pleistocene mammals. The main mass of organic carbon hosted in the Pleistocene muds is related to bitumen originating from oil migrating from deep accumulations within the Boryslav-Pokuttya Unit. The highest analysed bitumen content is 9.26 wt%. The chloride ion content, originating from highly concentrated brines ascending from the salt-bearing Miocene Vorotyshcha beds, vary from 0 to 4.66 wt% but this usually does not exceed 1 wt%. The natural pathways of underground fluids (oil, gas and water) migration within the Quaternary sediments were disturbed by intensive ozokerite mining operations run between the last three decades of the 19th century and 1960. Therefore, the present preservation and conservation conditions of large, extinct mammals' remains can be different from those prevailing during the Pleistocene, when the mammals were buried. Taking into consideration the contents of the remaining preservatives: chloride and bitumen, the most favourable zone for fossils conservation and preservation is located close to boreholes Nos 22, 23, 28 and 36N, where the thickness of Pleistocene muds exceeds 2 metres. Generally, the spatial distributions of bitumen and chloride ion contents within the Holocene sediments and salt-bearing Miocene Vorotyshcha beds are very similar to those in the Pleistocene sediments.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 447-461
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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