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    Wyświetlanie 1-13 z 13
    Tytuł:
    Drezdeńskie plany Kamieńca Podolskiego
    Drezden maps of the Kamieniec Podolski fortifications
    Autorzy:
    Opyrchał, L.
    Bąk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366536.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Kamieniec Podolski
    Starcke Johann Georg
    Johann Georg Maximilian von Fürstenhoff
    fortyfikacje
    plany miast
    Kamianets-Podilskyi
    fortifications
    town plans
    Opis:
    W zbiorach Państwowej Uniwersyteckiej Biblioteki Saksońskiej w Dreźnie (SLUB – Sächsische Landesbibliothek – Staats- und Universitätsbibliothek Dresden) znajdują się dwa rękopiśmienne, dotychczas niepublikowane w Polsce plany Kamieńca Podolskiego: pierwszy sporządził Johann Georg Starcke, drugi wykonał J. G. M. Fürstenhoff.
    Among the collections of the Saxon State and University Library Dresden (SLUB – Sächsische Landesbibliothek – Staats- und Universitätsbibliothek Dresden) there are two hand-drawn maps of the Kamieniec Podolski stronghold, so far unpublished in Poland, one by Johann Georg Starcke, and the other by J. G. M. Fürstenhoff.
    Źródło:
    Kwartalnik Architektury i Urbanistyki; 2016, 61, 1; 55-66
    0023-5865
    Pojawia się w:
    Kwartalnik Architektury i Urbanistyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of cash pooling application in funds management in a capital group in hard coal mining industry
    Efekty wykorzystania cash poolingu w zarządzaniu środkami pieniężnymi w grupie kapitałowej w górnictwie węgla kamiennego
    Autorzy:
    Bąk, P.
    Sierpińska-Sawicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/219810.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cash pooling
    grupa kapitałowa
    konsolidacja
    netting
    rachunki powiązane
    capital group
    pooling
    linked accounts
    Opis:
    The article presents the effects of cash pooling application in a capital group. Calculations made on a mining company data indicate that the group’s companies achieve benefits on interests. Companies with surplus funds achieve higher interests on deposits. Companies recording cash shortages on current accounts pay lower interests on debit in the current account. Cash pooling provides for optimal use of the group’s funds, harmonisation of procedures in the area of financial cooperation, improves the group’s financial liquidity, and reduces the costs of external financing. One must not forget the effect of cash pooling manifested in high flexibility of financial settlements among the companies within the capital group.
    W artykule zaprezentowane zostały efekty zastosowania cash poolingu w grupie kapitałowej w branży górnictwa węgla kamiennego. W pierwszej części niniejszego opracowania przedstawiono istotę, rodzaje oraz sposoby zastosowania cash poolingu. W drugiej części pracy autorzy podkreślają korzyści zastosowania cash poolingu w grupie kapitałowej. Obliczenia dokonane z wykorzystaniem danych spółki węglowej wykazały, że spółki grupy osiągają korzyści odsetkowe. Spółki posiadające nadwyżki środków uzyskują wyższe odsetki z lokat. Spółki wykazujące niedobory gotówki na rachunkach bieżących płacą niższe odsetki od kredytów w rachunku bieżącym. Cash pooling zapewnia optymalne wykorzystanie środków finansowych grupy, ujednolicenie procedur w zakresie współdziałania finansowego, poprawia płynność finansową grupy i ogranicza koszty finansowania zewnętrznego. Nie bez znaczenia jako efekt cash poolingu jest również wysoki stopień elastyczności dokonywania rozliczeń finansowych między spółkami grupy kapitałowej. Wdrożenie w grupie kapitałowej cash poolingu pozwala osiągnąć wiele korzyści finansowych.
    Źródło:
    Archives of Mining Sciences; 2016, 61, 1; 95-107
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy Logic Enhancement of Material Strain Hardening Data Obtained in the Heyers Test
    Autorzy:
    Skrzat, A.
    Wójcik, M.
    Bąk, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/354901.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fuzzy logic
    plasticity
    material hardening parameters
    Heyer's method
    Opis:
    Fuzzy logic determination of the material hardening parameters based on the Heyer’s method was applied in this research. As the fuzzy input variables, the length of two measuring bases and the maximum force registered in the Heyer's test were used. Firstly, the numerical experiment (the simulation of the fuzzification of the input data) with the assumed disturbance of input variables was performed. Next, on the basis of experimental investigations (eleven samples made from the same material), the membership functions associated with the input data were created. After that, the fuzzy analysis was examined. Fuzzy material hardening constants obtained by means of the α-level optimization and the extension principle methods were compared. Discrete values of the hardening data are found in the defuzzification process, by application of the mass center method.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1059-1065
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Degradation of Cast Iron Surface - Protective Paint Coat Joint
    Autorzy:
    Tupaj, M.
    Orłowicz, A. W.
    Mróz, A.
    Bąk, G.
    Abram, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381862.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin-wall casting
    flake graphite
    grey cast iron
    corrosion
    protective paint coat
    odlewy cienkościenne
    grafit
    żeliwo szare
    korozja
    powłoka ochronna
    Opis:
    The paper is a presentation of a study on issues concerning degradation of protective paint coat having an adverse impact on aesthetic qualities of thin-walled cast-iron castings fabricated in furan resin sand. Microscopic examination and microanalyses of chemistry indicated that under the coat of paint covering the surface of a thin-walled casting, layers of oxides could be found presence of which can be most probably attributed to careless cleaning of the casting surface before the paint application process, as well as corrosion pits evidencing existence of damp residues under the paint layers contributing to creation of corrosion micro-cells.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 133-136
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Semiconductor Element Substitution on the Electric Properties of Barium Titanate Ceramics
    Autorzy:
    Garbarz-Glos, B.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Bąk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/354672.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium titanate
    ceramics
    dielectric permittivity
    electric conductivity
    phase transitions
    PTCR effect
    Opis:
    The investigated ceramics were prepared by a solid-state reaction from simple oxides and carbonates with the use of a mixed oxide method (MOM). The morphology of BaTi0.96Si0.04O3 (BTSi04) ceramics was characterised by means of a scanning electron microscopy (SEM). It was found that Si+4 ion substitution supported the grain growth process in BT-based ceramics. The EDS results confirmed the high purity and expected quantitative composition of the synthesized material. The dielectric properties of the ceramics were also determined within the temperature range (ΔT=130-500K). It was found that the substitution of Si+4 ions had a significant influence on temperature behavior of the real (ε’) and imaginary (ε”) parts of electric permittivity as well as the temperature dependence of a.c. conductivity. Temperature regions of PTCR effect (positive temperature coefficient of resistivity) were determined for BTSi04 ceramics in the vicinity of structural phase transitions typical for barium titanate. No distinct maximum indicating a low-temperature structural transition to a rhombohedral phase in BTSi04 was found. The activation energy of conductivity was determined from the Arrhenius plots. It was found that substitution of Si ions in amount of 4wt.% caused almost 50% decrease in an activation energy value.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 887-890
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Dielectric Properties of BiNbO4-Based Microwave Ceramics
    Autorzy:
    Czekaj, D.
    Lisińska-Czekaj, A.
    Garbarz-Glos, B.
    Bąk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356034.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BiNbO4 ceramics
    impedance spectroscopy
    simulation and modelling
    quivalent electric circuit method
    Opis:
    In the present paper results of the studies devoted to computer simulations of dielectric response of electroceramics in a frequency domain as well as analysis of the experimental data are given. As an object of investigations BiNbO4-based microwave ceramics was taken. Simulations of the hypothetical impedance response of the ceramic system were performed under assumption of the brick-layer model. A strategy for analysis and modelling of the impedance data for microwave electroceramics was discussed. On the base of the discussed strategy modelling of the dielectric response of BiNbO4 ceramics was performed with the electric equivalent circuit method. The Voigt’s and Maxwell’s circuits were taken as electric models. Parameters of the electric components of the circuits were determined and related to parameters of the ceramic object under study. It was found that fitting quality was good and changed within the range χ2 = 6.78 × 10-4 – 6.77 × 10-5 depending on the model.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1177-1181
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of the Mechanochemical Synthesis for the Preparation of Advanced Ceramics Based on Barium Titanate
    Autorzy:
    Garbarz-Glos, B.
    Bąk, W.
    Budziak, A.
    Dulian, P.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/351521.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BaTiO3
    mechanochemical synthesis
    X-ray methods
    dielectric properties
    Opis:
    In the present study, the lead-free BaTi1-x Zrx O3 (for x = 0, 0.05 and 0.15) ceramics were prepared by High-Energy Ball Milling and heat treatments. The performed X-ray, SEM and EDS measurements confirmed high purity, good quality and the expected quantitative composition of the obtained samples. The study of dielectric properties was performed by means of broadband dielectric spectroscopy at the frequency ranging from 0.1 Hz to 10 MHz. The obtained measurement data, analyzed in accordance with the Arrhenius formalism demonstrated the presence of relaxation type dielectric mechanisms. The impedance answer of studied ceramic materials indicated the presence of two relaxation processes: one with a dominant resistive component and the other with a small capacitive component. The observed dielectric relaxation process is temperature dependent and has a “non-Debye” character.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1391-1396
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of a Thin-Wall Casting Mould Cavity Filling Conditions on the Casting Surface Quality
    Autorzy:
    Trytek, A.
    Orłowicz, A. W.
    Tupaj, M.
    Mróz, M.
    Markowska, O.
    Bąk, G.
    Abram, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/382148.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin wall casting
    grey cast iron
    cold shots
    computer simulation
    odlew cienkościenny
    żeliwo szare
    symulacja komputerowa
    Opis:
    The paper presents results of metallographic examination of faults occurring in the course of founding thin-walled cast-iron castings in furan resin sand molds. A non-conformance of the scab type was Observed on surface of the casting as well as sand buckles and cold shots. Studied the chemical composition by means of a scanning electron microscope in a region of casting defects: microanalysis point and microanalysis surface. Around the observed defects discloses high concentration of oxides of iron, manganese and silicon. A computer simulation of the casting process has been carried out with the objective to establish the cause of occurrence of cold shots on casting surface. The simulation was carried out with the use of NovaFlow & Solid program. We analyzed the flowing metal in the mold cavity. The main reason for the occurrence of casting defects on the surface of the casting was gating system, which caused turbulent flow of metal with a distinctive splash stream of liquid alloy.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 222-226
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alternative, Direct Synthesis Method of the Ceramic Solid Solutions Based on BaTiO3 Through a High Energy Ball Milling
    Autorzy:
    Bąk, W.
    Dulian, P.
    Garbarz-Glos, B.
    Czekaj, D.
    Lisińska-Czekaj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351595.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ceramics
    mechanochemical synthesis
    dielectric properties
    phase transitions
    ferroelectrics
    Opis:
    Polycrystalline samples BaTiO3 and the solid solutions Ba0.9 Sr0.1 TiO3, 0.9 Sr0.1 Ti0.9 Sn0.1 O3, Ba0.9 Sr0.1 Ti0.8 Sn0.2 O3 were obtained by means of a mechanochemical treatment based on the high-energy ball milling technique and next a high temperature solid state reaction method. The influence of synthesis condition on microstructural, dielectric and ferroelectric properties of obtained solid solutions were investigated. The structure and morphology of the investigated samples were characterized by an X-ray diffraction (XRD) and scanning electron microscopy (SEM). The characterization of electrical properties of the ceramics within the temperature range from –130°C to 250°C were performed by means of a dielectric spectroscopy method at the frequency ranging from 0.1 Hz to10 MHz. The diffusion of the paraelectric – ferroelectric phase transition and dielectric relaxation for ceramic samples are described.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 805-810
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Diffraction Study of Bismuth Layer-Structured Multiferroic Ceramics
    Autorzy:
    Lisińska-Czekaj, A.
    Czekaj, D.
    Garbarz-Glos, B.
    Bąk, W.
    Kuźniarska-Biernacka, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/355806.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bi5FeTi3O15 ceramics
    X-ray diffraction
    crystal structure
    Opis:
    Goal of the present research was to apply a solid state reaction route to fabricate bismuth layer-structured multiferroic ceramics described with the formula Bi5FeTi3O15 and reveal the influence of processing conditions on its crystal structure and phase composition. Simple oxide powders Bi2O3, TiO2 and Fe2O3 were used to fabricate Aurivillius-type bismuth layer-structured ferroelectrics. Pressureless sintering in ambient air was employed and the sintering temperature was TS = 900°C, TS = 1000°C and TS = 1040°C. The phase composition as well as crystal structure of ceramics sintered at various processing conditions was examined with powder X-ray diffraction method at room temperature. The Rietveld refinement method was applied for analysis of X-ray diffraction data. It was found that ceramics adopted orthorhombic structure Cmc21. The unit cell parameters of bismuth layer-structured multiferroic ceramics increased slightly with an increase in sintering temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 811-815
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics
    Autorzy:
    Lisińska-Czekaj, A.
    Rerak, M.
    Czekaj, D.
    Lubina, M.
    Garbarz-Glos, B.
    Bąk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353453.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low temperature
    broad band dielectric spectroscopy
    multiferroic Bi6Fe2Ti3O18 ceramics
    Opis:
    In the present research the tool of broadband dielectric spectroscopy was utilized to characterize dielectric behavior of Bi6Fe2Ti3O18is (BFTO) Aurivillius-type multiferroic ceramics. Dielectric response of BFTO ceramics was studied in the frequency domain (Δν=0.1Hz - 10MHz) within the temperature range ΔΤ=-100°C - 200°C. The Kramers-Kronig data validation test was employed to validate the impedance data measurements and it was found that the measured impedance data exhibited good quality justifying further analysis. The residuals were found to be less than 1%, whereas the "chi-square" parameter was within the range χ2~-10-7 -10-5. Experimental data were analyzed using the circle fit of simple impedance arc plotted in the complex Z”-Z` plane (Nyquist plot). The total ac conductivity of the grain boundaries was thus revealed and the activation energy of ac conductivity for the grain boundaries was calculated. It was found that activation energy of ac conductivity of grain boundaries changes from ΕA=0.20eV to ΕA=0.55eV while temperature rises from Τ=-100°C up to Τ=200°C. On the base of maxima of the impedance semicircles (ωmτm=l) the relaxation phenomena were characterized in terms of the temperature dependence of relaxation times and relevant activation energy was calculated (ΕA=0.55eV).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1447-1452
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Processing Conditions on Crystal Structure of Bi6Fe2Ti3O18 Ceramics
    Autorzy:
    Lisińska-Czekaj, A.
    Lubina, M.
    Czekaj, D.
    Rerak, M.
    Garbarz-Glos, B.
    Bąk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353909.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    influence
    condition
    crystal structure
    Opis:
    Aim of the present research was to apply a solid state reaction route to fabricate Aurivillius-type ceramics described with the formula Bi6Fe2Ti3O18 (BFTO) and reveal the influence of processing conditions on its crystal structure. Pressureless sintering in ambient air was employed and the sintering temperatures were 850 and 1080 °C. It was found that the fabricated BFTO ceramics were multiphase ones. They consisted of two Bim+1Fem-3Ti3O3m+3 phases, namely the phase with m=5 (i.e. the stoichiometric phase) and m=4 (i.e. the phase with a reduced number of layers in the slab). Detailed X-ray diffraction patterns analysis showed that both phases adopted the same orthorhombic structure described with Fmm2 (42) space group. The ratio of weight fractions of the constituent phases (m=5): (m=4) was ~30:70.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 881-886
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Sn and Pb Ions Substitutions on Dielectric Properties of Barium Titanate
    Autorzy:
    Bąk, W.
    Kajtoch, C.
    Ptaszek, S.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Ziętek, D.
    Glos, T.
    Garbarz-Glos, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352509.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium titanate ceramics
    dielectric properties
    phase transition
    Opis:
    The results of the microstructural and dielectric measurements of (Ba1-xPbx)(Ti1-xSnx)O3 (BPTSx) (x = 0, 0.05, 0.10, 0.30) polycrystalline samples are presented. The samples were obtained by means of a high temperature synthesis and their expected stoichiometry was confirmed by energy dispersive spectroscopy (EDS) measurements. The dielectric properties of BPTSx were studied with the use of broadband dielectric spectroscopy. The measurements over a wide range of temperature (from 140 K to 600 K) and frequency (from 0.1 Hz to 10 MHz) were performed. The experimental results indicate an influence of Pb ions in a sublattice A and Sn ions in a sublattice B substitution on paraelectric - ferroelectric phase transition parameters. Diffused phase transitions from a paraelectric to ferroelectric state (for x = 0.10 and x = 0.30) were observed. From the electric modulus measurements in the frequency domain the relaxation times and the activation energy were determined.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 905-908
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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