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    Wyświetlanie 1-36 z 36
    Tytuł:
    Morfologia i budowa wewnętrzna terasy III (bifurkacyjnej) w Poznańskim Przełomie Warty
    Autorzy:
    Antczak-Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/295016.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    river terraces
    bifurcation
    valley floor
    Opis:
    Results of a case study on the Warta River were presented which demonstrate climatically controlled valley floor evolution. The change in channel pattern meant also a change in valley floor development. Very flat and broad sandy-gravely bottoms formed by braided rivers were cut by better organised meandering rivers. The key profile at Żabinko shows sediments at the braided channel and organic deposits 14C dated. The dates point to bölling interstadial age. A clear differentiation in outflow direction has been fund in the vertical pattern of sedimentation from the western to northern sector. This analysis show that the bifurcation of waters ended at level of the bifurcation (III) terrace.
    Źródło:
    Landform Analysis; 2011, 16; 194-196
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ochrona przyrody nieożywionej na terenie Wielkopolskiego Parku Narodowego. Kopalne i współczesne terasy Warty w zapisie strukturalnym i morfologicznym
    Autorzy:
    Górska-Zabielska, M.
    Antczak-Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/295012.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    przyroda nieożywiona
    Wielkopolski Park Narodowy
    terasy Warty
    zapis strukturalny i morfologiczny
    Źródło:
    Landform Analysis; 2011, 16; 187-190
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition of the Surface Zone of Nitrided Cast Steels and Their Mechanical Properties
    Autorzy:
    Brzózka, K.
    Budzynowski, T.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506569.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    81.65.Lp
    81.40.-z
    76.80.+y
    61.05.cp
    68.37.-d
    81.40.Pq
    Opis:
    Conversion electron Mössbauer spectroscopy and structural X-ray diffractometry have been used to study nitrides formation in the surface layer of cast steels subjected previously to low-temperature nitriding. It has been found that creation of iron-nitrogen phases strongly depends on sample composition. Nitrides: $γ^\prime-Fe_{4}N$ and $\epsilon-Fe_{2-3}N$ arise in the course of the nitriding procedure in most investigated cast steels. Moreover, considerable changes in their microstructure and tribological properties occur. The depth profile of nitrides has been derived for selected cast steel.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 28-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of friction products and the surface of tribological system elements
    Autorzy:
    Brzózka, K.
    Żurowski, W.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147924.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    abrasive wear
    Mössbauer spectroscopy
    wear resistance
    Opis:
    The goal of the paper is to identify characteristic features of the surfaces of rubbing bodies and friction products, which come into being when friction processes are realized under optimal conditions, regarding wear resistance. Mössbauer investigations carried out both in scattering and transmission arrangement have evidenced, between others, differences in oxides content and their phase composition, depending on the temperature of tribological system in the course of friction test. It has been found that the wear products obtained at the optimal temperature are composed of the much smaller particles than those produced at lower or at higher temperature.
    Źródło:
    Nukleonika; 2013, 58, 1; 99-103
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of the superficial region and mechanical properties of nitrided cast steels
    Autorzy:
    Górka, B.
    Budzynowski, T. W.
    Brzózka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147910.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cast steel
    microhardness
    Mössbauer spectroscopy
    nitriding
    wear resistance
    Opis:
    A series of cast steels were subjected to two-stage low-temperature nitriding. Mossbauer, XRD and mechanical investigations were carried out for both as-cast and nitriding materials in order to determine phase composition (especially the content of gamma'-Fe4N and epsilon-Fe2-3N), microhardness of the superficial region as well as tribological properties. It has been stated that the relative content of iron-nitrogen phases strongly depends on chemical composition of the cast steel and the effective thickness of the surface layer comprising iron nitrides is less than 0.015 mm. Considerable increase of surface microhardness and wear resistance of nitrided specimens in comparison with their as-cast counterparts has been observed. It has been found that the values of microhardness of nitrided samples at the surface are above twice larger than those in the core.
    Źródło:
    Nukleonika; 2013, 58, 1; 117-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Presence of plant hormones in composts made from organic fraction of municipal solid waste
    Autorzy:
    Klimas, E.
    Szymańska-Pulikowska, A.
    Górka, B.
    Wieczorek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/962839.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Composting is a process of the biological decomposition of organic matter under aerobic conditions. Composts made from waste may still contain other substances that influence plant growth and development, such as vitamins or plant growth substances (plant hormones). Application of products containing phytohormones has an effect on numerous physiological processes in plants. Among observable results are: improved condition of the root system, increased absorption of nutrients, improved stress and disease resistance and delayed aging. The purpose of the research was to analyse the occurrence of plant hormones in mature composts made from selectively collected organic fraction of household municipal solid waste. Solid waste processing was carried out in a composting plant located at the Municipal Waste Management Plant in Żywiec (Silesian Province, Żywiecki District, Poland). The composting plant uses a Herhor bioreactor. Organic waste constituted 70% of the mixture, with the remaining 30% composed of structural material. Regarding the varying amounts of green waste (mainly grass clippings), the composts were divided into two groups: early spring composts and late spring composts. Four out of the five analysed substances (from the auxin and cytokinin groups) were found in composts made from waste collected in early spring. Composts made from waste collected from May to June contained mostly cytokinins and gibberellic acid. Total concentration of plant hormones in the composts was related to the content of plant waste in processed material.
    Źródło:
    Journal of Elementology; 2016, 21, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium
    Autorzy:
    Brzózka, K.
    Sovák, P.
    Szumiata, T.
    Górka, B.
    Gawroński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428972.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.70.-i
    76.80.+y
    78.20.Ls
    Opis:
    Thin films of Nanoperm alloys with partial substitution of iron by yttrium are the subject of investigations. The attention is fixed on the influence of yttrium substitution on structure and magnetic characteristics of the samples. The effect of film thickness is also considered. Conversion electron Mössbauer spectroscopy and magneto-optic Kerr effect were used to derive hyperfine parameters and coercive field, respectively. Coexistence of crystalline bcc-Fe phase and an amorphous one with diverse proportion was stated in most of the samples. It was found that surface and interface regions contribute to the magnetic properties of films.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1270-1272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Study of Fe-Si(Ge)-Nb-Cu-B Finemet Alloys
    Autorzy:
    Michalik, S.
    Bednarcik, J.
    Brzózka, K.
    Sovak, P.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534048.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.C-
    61.46.Hk
    Opis:
    Structural changes in Finemet based alloys invoked by germanium replacement for silicon were investigated using the X-ray diffraction, the X-ray absorption spectroscopy and the Mössbauer spectroscopy. Ge substitution preserves a nanostructural character of annealed samples at temperature 550°C; specifically the formation of a $DO_3$-type with about 19 at.% of (Si,Ge) was confirmed. The mean size of nanocrystals was estimated to be about 7 nm.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 818-819
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Study of Magnetic Texture of Finemet-Type Ribbons
    Autorzy:
    Brzózka, K.
    Sovák, P.
    Górka, B.
    Szumiata, T.
    Gawroński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506573.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.Kj
    81.40.Ef
    Opis:
    Magnetic texture of amorphous Finemet-type alloys substituted by Co, Ni, Mn, Ge and V was investigated by means of Mössbauer spectroscopy using various angular configurations. Samples in form of ribbons were manufactured by single-roller melt spinning technique. In most of investigated alloys some preference of alignment of atomic magnetic moments in-plane of sample is stated, except of some alloys substituted by germanium in which slight tendency to out-of plane spin orientation is proved.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 33-36
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Magnetic and Mössbauer Results Obtained for Palaeozoic Rocks of Hornsund, Southern Spitsbergen, Arctic
    Autorzy:
    Szlachta, K.
    Michalski, K.
    Brzózka, K.
    Górka, B.
    Gałązka-Friedman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811894.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.25.F-
    Opis:
    This analysis was performed as a part of the palaeomagnetic project focused on the reconstruction of the palaeogeographic position of the Svalbard Archipelago and adjacent crustal units (European Arctic) in the Palaeozoic and Mesozoic. Three rock formations - Cambrian, Devonian and Carboniferous were sampled in the area of Hornsund, southern Spitsbergen. The main aim of the presented study is to identify ferromagnetic minerals (sensu lato) - the carriers of the natural remanent magnetisation in the investigated rocks. A wide range of magnetic methods were used: the Lowrie tests, unblocking temperatures determinations and the measurement of coercivity spectra as well as the Mössbauer studies. In Devonian and Carboniferous samples all applied methods indicate the domination of the hematite natural remanent magnetisation carrier. In Cambrian rocks magnetic measurements reveal a mixture of ferromagnetic (sensu lato) minerals with varying coercivities and unblocking temperatures. The Mössbauer data improve the identification, suggesting that in Cambrian rocks the carrier of the dominating natural remanent magnetisation component is maghemite.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1675-1682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Magnetic Hyperfine Field Distribution for Spherical Nanoparticles of bcc Structure
    Autorzy:
    Szumiata, T.
    Gzik-Szumiata, M.
    Brzózka, K.
    Gawroński, M.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813877.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Bf
    76.80.+y
    Opis:
    We propose a simple model for temperature evolution of magnetic hyperfine field distribution of spherical bcc Fe nanoparticles. We performed mean field approximation calculations of mean spin value in each spherical shell of nanoparticle. Considering magnetic hyperfine field values reported for iron thin films we predicted possible values of hyperfine fields in the internal and surface region of the particles as a function of temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 537-540
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Co and V substitution on structural properties of FINEMET-type alloys
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Brzózka, K.
    Górka, B.
    Sovák, P.
    Pavlík, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148217.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic texture
    CEMS
    polarized radiation
    Opis:
    The effect of addition of Co and V on the hyperfine parameters of amorphous as well as nanocrystalline Finemet-type alloys has been studied by means of transmission Mössbauer spectrometry. It was stated that these elements infiltrate into crystalline grains in the course of crystallization, what causes alteration in structure. Different evolution of magnetic hyperfine field is reported in both cases and analyzed. In the series of alloys substituted by vanadium, the substantial paramagnetic component attributed to iron-poor regions in the amorphous remainder was found.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 21-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finemet Thin Films Substituted by Chromium - CEMS and MOKE Study
    Autorzy:
    Brzózka, K.
    Szumiata, T.
    Sovák, P.
    Górka, B.
    Hibner, K.
    Balcerski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1533968.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    61.46.Hk
    76.80.+y
    78.20.Ls
    Opis:
    Conversion electron Mössbauer spectroscopy and magneto-optical Kerr effect were applied to investigate hyperfine interactions and macroscopic magnetic properties of Finemet-type thin films. Phase analysis as well as compositional evolution of hyperfine parameters and coercivity was performed in the range of chromium percentage 0 ≤ x ≤ 14. Essential differences in structure and hyperfine parameters were found for films of different chromium concentration. Coercivity shows non-monotonic dependence with minimal value at x = 5.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 794-796
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Al doping on microstructure and hyperfine interactions in FINEMET
    Autorzy:
    Brzózka, K.
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Zorkovská, A.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147216.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    FINEMET
    nanocrystalline alloys
    Al-dopped FINEMET
    Opis:
    Structure and hyperfine interactions of amorphous and nanocrystalline FINEMET were investigated by means of Mössbauer spectrometry. It was found that substitution of x iron atoms with aluminum ones causes changes in the properties of both amorphous and nanocrystalline alloys as well as in the structure of individual phases. The reduction of hyperfine magnetic field caused by atom substitution is a non-linear function of x, unlike the linear dependence expected because of dilution. Temperature studies reveal a double magnetic phase transition at 250°C and 330°C as well as point to the variety of phases in the examined material.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 59-62
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametry magnetyczne jako wskaźnik procesów zachodzących w czarnoziemie zdegradowanym uformowanym na miechowskim płacie lessowym
    Magnetic parameters as an indicator of the processes occurring in the degraded chernozem developed in loess from Miechow area
    Autorzy:
    Dytlow, S.K.
    Gorka-Kostrubiec, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/886980.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    powiat miechowski
    gleby
    parametry gleby
    parametry magnetyczne
    magnetometria glebowa
    czarnoziemy zdegradowane
    podatnosc magnetyczna
    Opis:
    Praca miała na celu przedstawienie zmian parametrów magnetycznych i glebowych, które charakteryzują procesy zachodzące w czarnoziemie zdegradowanym uformowanym na płacie lessowym z okolic Miechowa. Do badań zastosowano magnetometrię glebową oraz metodypomiaru odczynu pH, strat po prażeniu i zawartości węglanów w glebie. W pracy wykorzystano parametry pętli histerezy oraz parametry zależne od temperatury: SIRM(T)i κ(T), do identyfi kacji minerałów magnetycznych obecnych w profi lu glebowym. Podatność magnetyczna oraz jej zależność od częstotliwości była użyta jako wskaźnik wzbogacenia poziomów glebowych w frakcję cząstek magnetycznych powstałych w procesie pedogenezy. Stwierdzono, że poziomy A i ABbr(Bt) mają podobne wartości parametrów magnetycznych χ, χARM i χfd%. Poziomy A i ABbr(Bt) są wzbogacone w silnie magnetycznie tlenki żelaza (maghemit) o małych wartościach koercji magnetycznej. Skała macierzysta (badany płat lessów z okolic Miechowa) zawiera hematyt o słabym namagnesowaniu i silnej koercji magnetycznej. Duże wzbogacenie magnetyczne w poziomach A i ABbr(Bt) jest związane z wysoką zawartością materii organicznejw górnych poziomach glebowych, dla których parametr strat przy prażeniu wskazywał na 8–10-procentowym udział materii organicznej.
    The aim of this paper is to present the changes in magnetic and soil parameters that characterize the processes occurring in the degraded chernozem formed in loess from Miechow area. The study used magnetic properties of soil and the method of measuring reactivity pH, loss on ignition and carbonate content in the soil. The A and ABbr(Bt) horizons have similar values of the magnetic parameters: χ, χARM and χfd%. Both horizons [A and ABbr(Bt)] are enriched in strongly magnetic iron oxides (maghemit) with low values of magnetic coercivity. A parent rock (loess from the Miechow area) contains hematite with low magnetization and high magnetic coercivity. In the study the parameters of hysteresis loop and the temperature-dependent parameter: SIRM(T) and κ(T) were used to identify the magnetic minerals present in the soil profi le. Magnetic susceptibility and its dependence on frequency were used to identify the enrichment of soil horizons in the fraction of magnetic particles formed during pedogenesis. Large magnetic enrichment in horizons A and ABbr(Bt) is associated with a high content of organic matter in the upper levels of the soil, for which the parameter of loss on ignition point to 8–10% of the organic matter.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2014, 23, 2[64]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical, magnetic and Mössbauer effect analysis of road dust from expressway
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Brzózka, K.
    Świetlik, R.
    Trojanowska, M.
    Strzelecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147916.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    road dusts
    environmental dusts
    flame spectrometry
    Mössbauer spectrometry
    magnetic susceptibility
    Opis:
    Environmental dusts of urban and industrial origin are one of the most important factors responsible for air and soil pollution - mainly because of heavy metals content. In this work a dust collected from the acoustic barriers of E-77 expressway (Poland) has been investigated. Chemical analysis was performed by means of atomic absorption spectrometer with flame atomization (F-AAS). Fe, Al and Zn metals dominate in the investigated road dusts. Mossbauer spectra collected at room temperature enabled the identification of several iron-containing phases in the dust. Some traces of hematite and magnetite have been found as well as alfa-Fe phase in ferromagnetic state. A significant component could be interpreted as pure iron in paramagnetic state. The dominating doublet in the spectrum of high quadrupole splitting could correspond to iron carbonates. Complementary measurements of low-field AC magnetic susceptibility confirmed a different metal content in the road dust samples collected from different altitudes of acoustic barriers.
    Źródło:
    Nukleonika; 2013, 58, 1; 109-112
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Structure and Magnetic Characteristics of FINEMET Alloys Substituted by Vanadium
    Autorzy:
    Brzózka, K.
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Sovák, P.
    Pavlík, G.
    Kolesár, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813522.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    76.80.+y
    Opis:
    Amorphous and nanocrystalline FINEMET-type alloys with vanadium addition up to 7 at% were investigated by the MÖssbauer spectroscopy and magnetic methods. The outcomes evidence alterations in grain structure, although the main effect is related to the changes in intergranular phase. This induces diminution of mean hyperfine field, saturation induction and Curie temperature as well as the increase in coercivity.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 51-54
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Ordering in Fe-Ga Thin Films Examined by Mössbauer Spectrometry
    Autorzy:
    Szumiata, T.
    Brzózka, K.
    Gawroński, M.
    Górka, B.
    Javed, A.
    Morley, N.
    Gibbs, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506454.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.70.Ak
    76.80.+y
    Opis:
    The detailed analysis of atomic and magnetic structure has been performed by Mössbauer spectroscopy for polycrystalline $Fe_{80}Ga_{20}$ films of different thickness ranging from 20 nm to 200 nm. The films were deposited on Si(100) substrate using dual sputtering and evaporation method. Obtained CEMS spectra have been fitted with several Gaussian distributions of hyperfine magnetic field. The results point to the domination of BCC disordered A2 phase and the absence of $DO_{3}$ and $L1_{2}$ phases in the films. Both hyperfine parameters and lattice constant reveal anomaly for 40 nm thick sample - presumably due to the change of the internal stress. Spin texture evolves from in-plane to out-of-the-plane configuration with increasing thickness.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 21-23
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron-containing phases in fly ashes from different combustion systems
    Autorzy:
    Szumiata, T.
    Gzik-Szumiata, M
    Brzózka, K.
    Górka, B.
    Gawroński, M.
    Świetlik, R.
    Trojanowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148055.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fly ashes
    coal combustion
    Mössbauer spectrometry
    environmental protection
    Opis:
    The investigations of iron-containing phases existing in fly ashes were performed using transmission Mössbauer spectrometry. The examined samples of fly ashes were collected from different coal combustion systems, that is, stoker-fired boiler in municipal heating plant and pulverized coal boiler in power plant. Several phases are identifi ed in the samples: iron oxides, paramagnetic aluminosilicate glass with Fe3+ ions and Al2O4- -type spinel with Fe2+ ions. It was pointed out that proportions of contents of phases strongly depend not only on the combustion temperature but also on the way of ash collection.
    Źródło:
    Nukleonika; 2015, 60, 1; 151-154
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Analysis of Magnetic Inclusions in Nanomaterials Based on Multiwall Carbon Nanotubes
    Autorzy:
    Brzózka, K.
    Krajewski, M.
    Małolepszy, A.
    Stobiński, L.
    Szumiata, T.
    Górka, B.
    Gawroński, M.
    Wasik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032146.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.Qr
    61.46.Fg
    61.48.De
    75.50.Tt
    75.75.Cd
    81.07.De
    Opis:
    Functionalized multiwall carbon nanotubes as well as nanocomposite based on that material covered by nanoparticles composed of iron oxides were the subject of investigations. In order to identify all iron-bearing phases including those reported on the base of previous X-ray diffraction measurements, the transmission Mössbauer spectroscopy was utilized. The experiments were carried out both at room temperature and also at low temperatures. It was stated that in the investigated nanotubes some impurities were present, originating from the catalyst remains, in form of Fe-C and α -Fe nanoparticles. The Mössbauer spectra collected for the nanocomposite showed a complex shape characteristic of temperature relaxations. The following subspectra related to iron-based phases were identified: sextet attributed to hematite, with hyperfine magnetic field reduced due to the temperature relaxations, sextet corresponding to iron carbide as well as two doublets linked to superparamagnetic hematite and ferrihydrites.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 863-865
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetometria jako narzędzie do oceny zanieczyszczeń środowiska
    Magnetometry as a tool to evaluate the environmental pollution
    Autorzy:
    Gorka-Kostrubiec, B.
    Krol, E.
    Teisseyre-Jelenska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084284.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    srodowisko
    zanieczyszczenia srodowiska
    ocena zanieczyszczen
    narzedzia
    magnetometria terenowa
    podatnosc magnetyczna
    Warszawa
    powietrze atmosferyczne
    gleby
    Opis:
    This paper presents the use of magnetometry to study pollution of soil and air. The magnetic method consists in determining the magnetic properties of pollution floating in the air and deposited in the soil, the leaves of trees or household dust in apartments. The method based on the fact that the magnetic particles present in the pollution are associated with heavy metals and toxic trace elements harmful to human health. The study of traffic pollution was focused on the spatial distribution of pollution in soils along roads in relation to the distance from the edge of road, the area topography and the factors affecting the speed of motor transport (traffic lights, traffic jams, road narrowing, etc.). The study of air pollution allowed to determine the seasonal correlation between pollution deposited on filters and meteorological parameters such as temperature, humidity and precipitation. Detailed analysis of magnetic susceptibility as an indicator of pollution revealed increasing trend with temperature and absolute humidity in the cold months of the year and the decreasing trend in the warm months. Similar correlations were not observed between the magnetic susceptibility and the precipitation. The second part presents a study of indoor air pollution based on measurements of dust collected in apartments in different districts of Warsaw. It was found that floor on which dust was taken did not affect the amount and composition of pollution in opposite to vehicle traffic, housing density and way of ventilation. Study shows that the most polluted apartments are in the Center, in the district of Praga Południe, Mokotów and Ursynów located close to the narrow streets with the large vehicle traffic and poor ventilation. Correlation of the magnetic susceptibility with the concentration of heavy metals in household dust is the base for use of susceptibility for monitoring indoor air pollution.
    Źródło:
    Prace i Studia Geograficzne; 2013, 51; 17-28
    0208-4589
    Pojawia się w:
    Prace i Studia Geograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie metody magnetycznej w biomonitoringu zanieczyszczeń środowiska
    Application of magnetic method in environmental pollutions
    Autorzy:
    Dytlow, S.K.
    Gorka-Kostrubiec, B.
    Bondar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084290.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    zanieczyszczenia srodowiska
    monitoring biologiczny
    metody magnetyczne
    zastosowanie
    zanieczyszczenia powietrza
    kasztanowiec
    lipa
    drzewa lisciaste
    Warszawa
    Kijow
    Opis:
    The paper presents results of a study of air pollution accumulated on the surfaee of leaves and bark of trees and soil in the urban environment of a city. The study bused magnetic method, which is based on the measurements of parameters of all magnetic minerals contained in traffic and industrial pollution. The samples of leaves and bark of chestnut trees and soil under the trees were taken from several places located in the centre of Warsaw (Poland) and Kiev (Ukraine) along the main roads which varied with traffic density and the level of pollution. The study showed that the magnetic susceptibility of leaves at the beginning and at the end of the growing season increases several times. It proved that they are a good bio-indicator of the level of air pollution. According to the results the level of pollution in Warsaw and Kiev are comparable for areas exposed to high traffic pollution and for parks/squares. The soil susceptibility is always higher than the susceptibility of leaves. This is due to the accumulation of pollution by the soil during the time period longer than the growing season. In the parks, there are no leaves in the winter and the consequent lack of soil protection against pollution can affect the increase in the susceptibility of soils. It was found that the susceptibility of the soil in the contrary to the susceptibility of the leaves does not always correlate with the intensity of road traffic. Probably, in winter the other factors such as power plant or domestic heating systems play important role.
    Źródło:
    Prace i Studia Geograficzne; 2013, 51; 7-16
    0208-4589
    Pojawia się w:
    Prace i Studia Geograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress Monitoring in Steel Elements via Detection of AC Magnetic Permeability Changes
    Autorzy:
    Szumiata, T.
    Hibner, K.
    Dziewiecki, K.
    Mazur, Z.
    Gockiewicz, A.
    Gzik-Szumiata, M.
    Górka, B.
    Witoś, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030407.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.60.Ej
    75.50.Bb
    75.30.Gw
    62.20.D-
    Opis:
    The influence of mechanical stress on low frequency AC magnetic permeability was studied. The cold-drawn bars with C45 steel were subjected to investigation. The tensile stress (within elastic regime) was applied by means of material testing machine. Simple measuring system was assembled, which consisted of: function generator with magnetizing coil, detection coil and precise AC voltmeter. The registered changes of induced voltage were proportional to the change of magnetic permeability of the stretched rods. The obtained results were almost frequency-independent due to low frequency limit (250-500 Hz, weak eddy currents, no spin-origin energy dissipation). A significant magneto-mechanical hysteresis was observed slightly evolving from cycle to cycle with tendency of stabilization. The extension of basic Stoner-Wohlfarth model of magnetic permeability allowed to fit the data reproducing hysteretic behavior and considering the relaxation of the internal stress. The proposed, low-cost method is suitable in the industrial applications for stress control in large-sized steel elements.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 719-721
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetism and structure evolution in Ni-Zn ferrites thin films - CEMS study
    Autorzy:
    Szumiata, T.
    Gzik-Szumiata, M.
    Brzózka, K.
    Górka, B.
    Gawroński, M.
    Javed, A.
    Farman, K.
    Fatima, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054837.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    81.15.Fg
    81.05.Je
    Opis:
    In this work, a ⁵⁷Fe conversion electron Mössbauer spectrometry and X-ray diffraction have been utilized in order to investigate the structural and magnetic order in 500 nm thick Ni-Zn ferrite films deposited on Si(100) substrate by laser ablation. Considering the contributions of the conversion electron Mössbauer subspectra corresponding to the tetrahedral (A) and octahedral (B) sites, the spinel inversion parameter in [Zn_{x}Fe_{1-x}]^{A}[Ni_{1-x}Fe_{1+x}]^{B}O₄ films has been estimated. The hyperfine field (B_{hf}) values in the investigated Ni-Zn ferrites thin films are about 5-8% smaller than those of bulk ferrites, which could be a sign of thermal magnetic relaxations due to the size effects. The distribution of hyperfine magnetic field directions was found to be affected by perpendicular anisotropy.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 836-838
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine fields and magnetoelastic surface effects in Fe72Cu1.5Nb4Si13.5B9 nanocrystalline alloy
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Brzózka, K.
    Blázquez-Gámez, J.
    Kulik, T.
    Żuberek, R.
    Ślawska-Waniewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148767.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    FINEMET
    Mössbauer spectroscopy
    nanocrystalline alloys
    surface effects
    surface magnetostriction
    Opis:
    In this work hyperfine fields of two-phase nanocrystalline Fe72Cu1.5Nb4Si13.5B9 alloys were studied in order to verify the existence of surface effects. To obtain a series of nanocrystalline samples with small grains of different sizes, a special non- -isothermal annealing procedure of an initially amorphous ribbon was applied. In the case of samples with a significant amount of crystallites, a high field (about 27.5 T) component of continuous part of the hyperfine field distribution was found that could be attributed to boundary regions between the grains and rest of the sample. The existence of the surface effects was confirmed in the magnetostrictive experiment.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 85-88
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of thermal annealing on structure and oxidation of iron nanowires
    Autorzy:
    Krajewski, M.
    Brzózka, K.
    Górka, B.
    Lin, W.-S.
    Lin, H. -M.
    Szumiata, T
    Gawroński, M.
    Wasik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148838.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous iron and iron oxides
    iron nanowires
    Mössbauer spectroscopy
    Raman spectroscopy
    thermal annealing
    Opis:
    Raman spectroscopy as well as Mössbauer spectroscopy were applied in order to study the phase composition of iron nanowires and its changes, caused by annealing in a neutral atmosphere at several temperatures ranging from 200°C to 800°C. As-prepared nanowires were manufactured via a simple chemical reduction in an external magnetic fi eld. Both experimental techniques proved formation of the surface layer covered by crystalline iron oxides, with phase composition dependent on the annealing temperature (Ta). At higher Ta, hematite was the dominant phase in the nanowires.
    Źródło:
    Nukleonika; 2015, 60, 1; 87-91
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore
    Autorzy:
    Szumiata, T.
    Rachwał, M.
    Magiera, T.
    Brzózka, K.
    Gzik-Szumiata, M.
    Gawroński, M.
    Górka, B.
    Kyzioł-Komosińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148303.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    metallurgical dusts
    coke dusts
    bog ore
    phase analysis
    Mössbauer spectrometry
    magnetic susceptibility
    Opis:
    Several samples of dusts from steel and coke plants (collected mostly with electro filters) were subjected to the investigation of content of mineral phases in their particles. Additionally, sample of bog iron ore and metallurgical slurry was studied. Next, the magnetic susceptibility of all the samples was determined, and investigations of iron-containing phases were performed using transmission Mössbauer spectrometry. The values of mass-specific magnetic susceptibility varied in a wide range: from 59 to above 7000 × 10−8 m3kg−1. The low values are determined for bog iron ore, metallurgical slurry, and coke dusts. The extremely high was obtained for metallurgical dusts. The Mössbauer spectra and X-ray diffraction patterns point to the presence of the following phases containing iron: hematite and oxidized magnetite (in coke and metallurgical dusts as well as metallurgical slurry), traces of magnetite fi ne grains fraction (in metallurgical dusts), amorphous glassy silicates with paramagnetic Fe3+ and Fe2+ ions, traces of pyrrhotite (in coke dusts), α-Fe and nonstoichiometric wüstite (in metallurgical slurry), as well as ferrihydrite nanoparticles (in bog iron ore). For individual samples of metallurgical dusts, the relative contributions of Fe2+/3+ ions in octahedral B sites and Fe2+ ions in tetrahedral A sites in magnetite spinel structure differs considerably.
    Źródło:
    Nukleonika; 2017, 62, 2; 187-195
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder
    Autorzy:
    Szumiata, T.
    Gzik-Szumiata, M.
    Brzózka, K.
    Gawroński, M.
    Górka, B.
    Kollár, P.
    Olekšáková, D.
    Polański, K.
    Szmaja, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810615.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.Bb
    75.60.Ej
    81.20.Ev
    Opis:
    Magnetic and structural studies were performed on $Fe_{50}Co_{50}$ material. The samples (disk-shaped, diameter: 10 mm, thickness: 2.5 mm) were fabricated by compaction of powder under pressure of 800 MPa for 5 min at temperatures 300-600°C. The powder was obtained by milling of $Fe_{50}Co_{50}$ alloy swarfs in high-energy planetary mill. The milling time varied from 1 h to 40 h. In the course of milling process the mean size of alloy pieces was decreasing from about 0.5 mm to 0.05 mm (scanning electron microscopy), which provided more compact structure after compression. The annealing process during compaction strongly reduces a coercive field of the samples. Parameters of conversion electron Mössbauer spectra are almost the same for all samples, which points to not significant changes of atomic and magnetic order after milling and compacting.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 403-405
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer study of vacuum annealed Fe100-xGax (10 less - than or equal to x less - than or equal to 35) thin films
    Autorzy:
    Szumiata, T.
    Górka, B.
    Brzózka, K.
    Gawroński, M.
    Gzik-Szumiata, M.
    Javed, A.
    Morley, N. A.
    Gibbs, M. R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147332.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Fe-Ga
    thin films
    CEMS
    MOKE
    Opis:
    This work reports results from comparative Mossbauer studies of as-deposited and annealed Fe100.xGax (10 less - than or equal to x less - than or equal to 35) high magnetostrictive thin films of constant thickness (50 plus or minus 2 nm). Films were grown on Si(100) substrates using a co-sputtering and evaporation chamber where Fe has been sputtered and Ga was evaporated. During growth of films, a magnetic field of 65 kA/m has been applied in the plane of the film. Annealed films have been obtained by heating in vacuum for 1 h at 350 centigrade without magnetic field. After annealing, the saturation field of the Fe-Ga films has been significantly reduced. By means of the 57Fe CEMS technique the contributions from several phases have been found: Fe-Ga A2 (bcc), traces of DO3 phase, a gallium-rich disordered phase and iron oxides (both geothite and magnetite). For the sample with x = 26.5 the heat treatment reduces the DO3 phase content whereas for the film with x = 16.4 the opposite tendency has been observed. Mossbauer results were compared with XRD and MOKE findings.
    Źródło:
    Nukleonika; 2013, 58, 1; 27-30
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer and Magnetic Study of Fe+Vitroperm+Plastic System
    Autorzy:
    Brzózka, K.
    Kollár, P.
    Szumiata, T.
    Sovak, P.
    Füzer, J.
    Fáberová, M.
    Bureš, R.
    Górka, B.
    Gawroński, M.
    Gzik-Szumiata, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201075.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    68.35.bd
    76.80.+y
    75.60.-d
    72.80.Tm
    Opis:
    Phase composition and magnetization curves of the soft magnetic composites, fabricated by compaction of several kinds of powders mixed in various proportions, have been investigated by means of conversion electron Mössbauer spectroscopy and an alternating gradient force magnetometry. The results point to significant quantity of iron oxides - hematite and magnetite - at the surface of the samples. After the rubbing of thin surface layer, the relative content of oxides was distinctly reduced. Magnetic measurements revealed very similar characteristics of hysteresis curves for all the investigated materials.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 148-149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Susceptibility and Evaluation of Causes of Cracks Formation in Braze-Weld Filler Metal in Lap Joints Aluminum – Carbon Steel Made with Use of CMT Method and High Power Diode Laser
    Autorzy:
    Adamiak, M.
    Wyględacz, B.
    Czupryński, A.
    Górka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/958197.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    braze-welding
    intermetallic compound phase
    high power diode laser
    brazing
    Opis:
    In this article results of studies on cracks formation susceptibility in braze-welded joints of thin aluminum sheets and double-sided zinc galvanized steel sheets for car body parts made by laser brazing with high power diode laser ROFIN DL 020 and CMT MIG-brazing, with filler material in form of powder and wire accordingly, were presented. Optimal welding parameters were determined by visual acceptance criteria. On joints made with optimal parameters further examinations were carried. Results of macro- and microscopic metallographic examinations, structural roentgenography, EDS microanalysis and hardness tests were presented. Causes of brittle intermetallic Fe-Al phases formation in Al-matrix filler metal in dissimilar aluminum – zinc plated carbon steel joints were pointed.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2113-2123
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing of flame sprayed Al2O3 matrix coatings containing TiO2
    Autorzy:
    Czupryński, A.
    Górka, J.
    Adamiak, M.
    Tomiczek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/356108.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flame spray process
    coating
    ceramic powder
    abrasive wear resistance
    erosion wear resistance
    adhesion strength
    Opis:
    The paper presents the results of the properties of flame sprayed ceramic coatings using oxide ceramic materials coating of a powdered aluininiuni oxide (Al2O3) matrix with 3% titanium oxide (TiO2) applied to unalloyed S235JR grade structural steel. A primer consisting of a metallic Ni-Al-Mo based powder has been applied to plates with dimensions of 5X200X300 mm and front surfaces of ø40x50 mm cylinders. Flame spraying of primer coating was made using a RotoTec 80 torch, and an external coating was made with a CastoDyn DS 8000 torch. Evaluation of the coating properties was conducted using metallographic testing, phase composition research, measurement of microhardness, substrate coating adhesion (acc. to EN 582:1996 standard), erosion wear resistance (acc. to ASTM G76-95 standard), and abrasive wear resistance (acc. to ASTM G65 standard) and thermal impact. The testing performed has demonstrated that flame spraying with 97% Al2O3 powder containing 3% TiO2 performed in a range of parameters allows for obtaining high-quality ceramic coatings with thickness up to ca. 500 μni on a steel base. Spray coating possesses a structure consisting mainly of aluminium oxide and a small amount of NiAl10O16 and NiAl32O49 phases. The bonding primer coat sprayed with the Ni-Al-Mo powder to the steel substrate and external coating sprayed with the 97%Al2O3 powder with 3% TiO2 addition demonstrates mechanical bonding characteristics. The coating is characterized by a high adhesion to the base amounting to 6.5 MPa. Average hardness of the external coating is ca. 780 HV. The obtained coatings are characterized by high erosion and abrasive wear resistance and the resistance to effects of cyclic thermal shock.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1363-1370
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The econimic efficiency of growing sweet potato (Ipomoea batatas L.{Lam.}) in Polish soil and climate conditions
    Efektywność uprawy batata (Ipomoea batatas L.{Lam.}) w warunkach glebowo-klimatycznych Polski
    Autorzy:
    Krochmal-Marczak, B.
    Sawicka, B.
    Bienia, B.
    Górka, M.
    Otekunrin, O.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1790058.pdf
    Data publikacji:
    2020
    Wydawca:
    The Polish Association of Agricultural and Agribusiness Economists
    Tematy:
    sweet potato
    cultivation technologies
    marketable yield
    cultivars
    direct costs
    profitability index
    słodki ziemniak
    technologie uprawy
    plon handlowy
    odmiany
    koszty
    bezpośrednie
    wskaźniki opłacalności
    Opis:
    The aim of this research was to determine the economic efficiency of sweet potato production in Polish conditions (49°49′ N, 21°50′ E). The study was based on the results of a 3-year (2017-2019) field experiment conducted in slightly acidic brown earth. The experiment used the random subblocks method, in which the main experimental factors were cultivation technologies: A) traditional, with no cover, B) with the use of PP spunbond nonwoven. Secondary factors included 5 cultivars of sweet potato of all earliness classes (Goldstar, Carmen Rubin, Satsumo Imo, Beauregard, White Triumph). Constant organic and mineral fertilization was used, and cultivation was carried out in accordance with normal agricultural practice. The propagating material included rooted cuttings of sweet potato from in vitro propagation, planted with 50 x 75 cm spacing. The economic effect of production was determined by all experimental factors. The profitability of production was increased by the use of PP spunbond nonwoven. The most beneficial economic factors were achieved when growing the Beauregard cultivar, and the least – when growing White Triumph. The largest cost of sweet potato commercial production were sweet potato cuttings, which amounted to 56%, and the smallest – plant protection products – 1% of direct costs per 1 ha of crops. Sweet potato production in Polish soil and climate conditions between 2017–2019 turned out to be cost-effective.
    Celem badań było określenie opłacalności produkcji batata w warunkach Polski (49°49′ N, 21°50′ E). Badania oparto na wynikach trzyletniego (2017-2019) doświadczenia polowego przeprowadzonego na glebie brunatnej, lekko kwaśnej. Eksperyment założono metodą losowanych podbloków, w których czynnikami I rzędu były technologie uprawy: A) tradycyjna, bez okryw i B) z zastosowaniem agrowłókniny polipropylenowej. Czynnik II rzędu stanowiło 5 odmian batata: Goldstar, Carmen Rubin, Satsumo Imo, Beauregard, White Triumph. Stosowano stałe nawożenie organiczne i mineralne, a zabiegi pielęgnacyjne prowadzono według zasad dobrej praktyki rolniczej. Materiałem rozmnożeniowym były ukorzenione sadzonki batata, pochodzące z rozmnożenia in vitro, wysadzone w rozstawie 50 x 75 cm. Efekt ekonomiczny produkcji różnicowały wszystkie czynniki eksperymentu. Opłacalność produkcji zwiększało stosowanie włókniny polipropylenowej. Najkorzystniejsze wskaźniki ekonomicznie uzyskano uprawiając odmianę Beuregard, a najmniej korzystne – w uprawie odmiany White Triumph. Największym kosztem w produkcji towarowej były sadzonki batata, które stanowiły ponad 56% tych kosztów, najmniejszym zaś – środki ochrony roślin i wynosiły 1% kosztów bezpośrednich poniesionych na 1 ha uprawy tego gatunku. Produkcja batata w warunkach glebowo-klimatycznych Polski w latach 2017-2019, okazała się opłacalna.
    Źródło:
    Annals of The Polish Association of Agricultural and Agribusiness Economists; 2020, 22, 2; 99-110
    2657-781X
    2657-7828
    Pojawia się w:
    Annals of The Polish Association of Agricultural and Agribusiness Economists
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joining of the AMC Composites Reinforced with Ti3Al Intermetallic Particles by Resistance Butt Welding
    Autorzy:
    Adamiak, M.
    Tomiczek, B.
    Górka, J.
    Czupryński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353835.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite materials
    intermetallics
    Ti3Al
    resistance butt welding
    mechanical properties
    Opis:
    The introduction of new reinforcing materials continues to be investigated to improve the final behaviour of AMCs as well as to avoid some drawbacks of using ceramics as reinforcement. The present work investigates the structure, properties and ability of joining aluminium EN-AW 6061 matrix composite materials reinforced with Ti3Al particles by resistance butt welding as well as composite materials produced by mechanical milling, powder metallurgy and hot extrusion techniques. Mechanically milled and extruded composites show finer and better distribution of reinforcement particles, which leads to better mechanical properties of the obtained products. Finer microstructure improves mechanical properties of obtained composites. The hardness increases twice in the case of mechanically milled composites also, a higher reinforcement content results in higher particle dispersion hardening, for 15 wt.% of intermetallics reinforcement concentration composites reach about 400 MPa UTS. Investigation results of joints show that best hardness and tensile properties of joints can be achieved by altering soft conditions of butt welding process e.g. current flow time 1.2 s and current 1400 A. To improve mechanical properties of butt welding joints age hardening techniques can also be used.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 847-852
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mean annual precipitation in a mountain river catchment area in the period 1984-2012 (the case of Kamienica river)
    Kształtowanie się opadów w zlewni rzeki górskiej w wieloleciu 1984-2012 (na przykładzie rzeki Kamienicy)
    Autorzy:
    Cupak, A.
    Górka, A.
    Michalec, B.
    Wałęga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/100552.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
    Tematy:
    precipitation
    extreme rainfall
    annual precipitation
    mountain river catchment (basin)
    opad atmosferyczny
    opad ekstremalny
    wilgotność roku
    zlewnia górska
    Opis:
    The aim of the study is to evaluate the mean annual precipitation in the mountain river catchment area, in the period between 1984-2012. Data on daily rainfall totals was obtained from IMGW PIB in Warsaw, and it came from two weather stations: one in Nowy Sącz, and the other in Krynica. It has been demonstrated that during the multi-year period covered by the study, there were variations in terms of precipitation levels; the year 1987 should be considered e¬tremely dry, while 2010, extremely wet - in the latter year, extreme rainfall was noted. In the analysed multi-year period, within the total annual precipitation, rain dominated during the first half year, which undoubtedly affects the hydrological regime of the Kamienica river.
    Celem pracy jest ocena kształtowania się charakterystyk opadu na obszarze górskiej rzeki Kamienicy w wieloleciu 1984-2012. Dane dotyczące sum dobowych opadów pozyskano z IMGW PIB w Warszawie i pochodziły z dwóch stacji opadowych: Nowy Sącz i Krynica. Wykazano, że w badanym wieloleciu występowały zróżnicowane lata pod względem wilgotności; za szczególnie suchy należy uznać 1987 rok, a wilgotny to 2010 rok, gdyż w tym roku występowała największa liczba opadów ekstremalnych. W badanym wieloleciu w sumie rocznej opadów dominowały opady z półrocza letniego, co niewątpliwie wpływa na reżim hydrologiczny rzeki Kamienicy.
    Źródło:
    Geomatics, Landmanagement and Landscape; 2016, 2; 31-40
    2300-1496
    Pojawia się w:
    Geomatics, Landmanagement and Landscape
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Medobory Hills (Ukraine): Middle Miocene reef systems in the Paratethys, their biological diversity and lithofacies
    Miodobory – środkowomioceński system rafowy, jego zróżnicowanie biologiczne i litofacje
    Autorzy:
    Górka, M.
    Studencka, B.
    Jasionowski, M.
    Hara, U.
    Wysocka, A.
    Poberezhskyy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062479.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    coralline algae-vermetid reefs
    serpulid-microbialite reefs
    lithofacies
    biodiversity
    Badenian-Sarmatian boundary
    Ukraine
    Moldova
    rafy krasnorostowo-wermetidowe
    rafy serpulowo-mikrobialitowe
    litofacje
    bioróżnorodność
    granica baden-sarmat
    Ukraina
    Mołdawia
    Opis:
    The unique Middle Miocene reef belt formed within the Paratethyan realm constitutes at present the Medobory Hills in western Ukraine and northernmost Moldova. Not only is the size of this structure (almost 300 km long) quite unusual, but also the development of peculiar facies and their spatial distribution. Two distinct reef generations appear in Medobory (Late Badenian and Early Sarmatian), both separated by a sharp erosional boundary. Two Upper Badenian calcareous lithofacies dominate – organodetrital and biohermal (with coralline-algae as main framework builders accompanied by a rich invertebrate assemblage). The Lower Sarmatian strata, although megascopically very similar to Upper Badenian ones, differ drastically when studied closely. The main reef components here are serpulids and microbialites, usually with ubiquitous, but taxonomically highly impoverished fauna. Differences in lithofacies and biotic communities between both reef systems unveil open-marine environment during formation of Upper Badenian reefs and a drastic change of conditions at the Badenian/Sarmatian boundary (including emersion and intense weathering). The Early Sarmatian basin was established soon after and highly restricted conditions prevailed in it (e.g. with mesohaline waters and intense evaporation occurring simultaneously); its deposits are the last record of Middle Miocene sedimentation within the Medobory area.
    Wzgórza Miodoborów, rozciągające się na przestrzeni niemal 300 km na obszarze zachodniej Ukrainy i północnej Mołdawii, założone są na pasie raf miocenu środkowego, uformowanych w obrębie północno-wschodnich peryferii Paratetydy. Znaczne zróżnicowanie litofacjalne, jak i zmienność zespołów biotycznych wśród utworów rafowych jest rezultatem obecności dwóch generacji raf (późnobadeńskiej i wczesnosarmackiej) oddzielonych wyraźną powierzchnią erozyjną. Wśród wapiennych osadów górnego badenu dominują litofacje organodetrytyczne i biohermalne. Ich głównym składnikiem skałotwórczym są krasnorosty, którym towarzyszą bogate taksonomicznie zespoły bezkręgowców, obejmujące m.in. korale, mięczaki, szkarłupnie. Rafy sarmatu dolnego budowane są przez mikrobiality, w obrębie których występują serpule (i podrzednie mszywioły). Silnie zubożona taksonomicznie fauna zamieszkująca rafy sarmackie zdominowana jest przez mięczaki. Różnice bio- i litofacjalne w obrębie wymienionych generacji raf są efektem drastycznej zmiany warunków sedymentacji, połączonej z emersją i intensywnym wietrzeniem, do której doszło na przełomie badenu i sarmatu w efekcie przebudowy basenu przedkarpackiego. W jej wyniku pełnomorski zbiornik późnobadeński został zastąpiony przez silnie izolowany basen wczesnego sarmatu, zaś powstałe w tym ostatnim osady wieńczą sukcesję utworów miocenu w tej części zapadliska przedkarpackiego.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2012, 449; 147--174
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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