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Wyświetlanie 1-10 z 10
Tytuł:
Geophysical survey (GPR) in West Saqqara (Egypt): preliminary remarks
Autorzy:
Welc, F.
Trzciński, J.
Kowalczyk, S.
Mieszkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2027033.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ar chae o log i cal mis sion
ground-pen e trat ing ra dar
Dry Moat
Saqqara
Egypt
Opis:
Geo phys i cal in ves ti ga tions in West Saqqara area were part of the ar chae o log i cal field work of the Pol ish-Egyp tian archae o log i cal mis sion dur ing the cam paign in 2012. The main pur pose of geo phys i cal prospection us ing the groundpene trat ing ra dar (GPR) was to de ter mine the lo ca tion of po ten tial un der ground se pul chral struc tures. Dur ing the GPR sur vey, op ti mal depth pen e tra tion was achieved due to dry rocks and mono lithic struc ture of the lime stone pla teau on which the an cient cem e tery was lo cated. Us ing an tenna of 100 MHz, the depth of pen e tra tion was up to 45 m and with an tenna of 250 MHz, up to 15 meters. Three main groups of archaeological structures were identified: sarcophagi and mum mies, burial shafts; mo bile ob jects (solid rock blocks as frag ments of tombs). One of the main goal of the GPR sur - vey was to track the route of the west ern part of the Dry Moat, ex pressed by a wide and shal low de pres sion spread ing to - wards north-south. The re sults of geo phys i cal in ves ti ga tions sug gest that Saqqara pla teau is an ideal site for us ing GPR survey ing technology.
Źródło:
Studia Quaternaria; 2013, 30; 99-108
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?
Autorzy:
Konon, A.
Ostrowski, S.
Rybak-Ostrowska, B.
Ludwiniak, M.
Śmigielski, M.
Wyglądała, M.
Uroda, J.
Kowalczyk, S.
Mieszkowski, R.
Kłopotowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/138980.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
strike-slip fault pattern
restraining stepover
Permo-Mesozoic cover
Holy Cross Mountains Fold Belt
uskok przesuwczy
pokrywa
perm
mezozoik
Góry Świętokrzyskie
Opis:
A newly recognized Mnin restraining stepover is identified in the Permo-Mesozoic cover of the western part of the Late Palaeozoic Holy Cross Mountains Fold Belt (Poland), within a fault pattern consisting of dextral strikeslip faults. The formation of a large contractional structure at the Late Cretaceous – Cenozoic transition displays the significant role of strike-slip faulting along the western border of the Teisseyre-Tornquist Zone, in the foreland of the Polish part of the Carpathian Orogen. Theoretical relationships between the maximum fault offsets/ mean step length, as well as between the maximum fault offsets/mean step width allowed the estimation of the values of possible offsets along the Snochowice and Mieczyn faults forming the Mnin stepover. The estimated values suggest displacements of as much as several tens of kilometres. The observed offset along the Tokarnia Fault and theoretical calculations suggest that the strike-slip faults west of the Late Palaeozoic Holy Cross Mountains Fold Belt belong to a large strike-slip fault system. We postulate that the observed significant refraction of the faults forming the anastomosing fault pattern is related also to the interaction of the NW-SE-striking faults formed along the western border of the Teisseyre-Tornquist Zone and the reactivated WNW-ESE-striking faults belonging to the fault systems of the northern margin of the Tethys Ocean.
Źródło:
Acta Geologica Polonica; 2016, 66, 3; 429-449
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of texture evolution in KOBO extrusion process
Modelowanie rozwoju tekstury w procesie wyciskania metodą KOBO
Autorzy:
Kowalczyk-Gajewska, K.
Stupkiewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/350890.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plastyczność
mikrostruktura
tekstura krystaliczna
wyciskanie metodą KOBO
plasticity
microstructure
crystallographic texture
KOBO extrusion
Opis:
The paper is aimed at modelling of evolution of crystallographic texture in KOBO extrusion which is an unconventional process of extrusion assisted by cyclic torsion. The analysis comprises two steps. In the first step, the kinematics of the KOBO extrusion process is determined using the finite element method. A simplifying assumption is adopted that the material flow is not significantly affected by plastic hardening, and thus a rigid-viscoplastic material model with no hardening is used. In the second step, evolution of crystallographic texture is modelled along the trajectories obtained in the first step. A micromechanical model of texture evolution is used that combines the crystal plasticity model with a self-consistent grain-to-polycrystal scale transition scheme, and the VPSC code is used for that purpose. Since each trajectory corresponds to a different deformation path, the resulting pole figures depend on the position along the radius of the extruded rod.
Praca jest poświęcona modelowaniu rozwoju tekstury krystalograficznej w procesie wyciskania metodą KOBO - niekonwencjonalnym procesie wyciskania przy udziale cyklicznego skręcania. Analiza jest prowadzona w dwóch krokach. W pierwszym kroku, przy pomocy metody elementów skończonych, wyznaczane jest pole deformacji w procesie KOBO przy upraszczającym założeniu, że nie zależy ono w sposób istotny od umocnienia materiału. W pracy zastosowano model sztywno-lepkoplastyczny bez umocnienia. W drugim kroku, modelowany jest rozwój tekstury krystalograficznej wzdłuż trajektorii wyznaczonych w pierwszym kroku. W tym celu wykorzystano mikromechaniczny model łączacy model plastyczności kryształów i samozgodny schemat przejścia mikro-makro zaimplementowany w programie VPSC. Poniewaz ścieżka deformacji jest inna dla każdej trajektorii, wynikowe figury biegunowe wykazują zależność od położenia wzdłuż promienia wyciskanego pręta.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 1; 113-118
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical cycles in the modern power system – exergy analysis under partial loads
Autorzy:
Kowalczyk, T.
Ziółkowski, P.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/175484.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hierarchical cycles
partial loads
combine cycles
Opis:
The aim of this paper is to investigate thermodynamic efficiency of hierarchical thermodynamic cycles under partial loads by using of exergy analysis. Advanced hierarchical cycles are composed of few energy conversion systems, which can be powered by several different sources of energy jointly. This kind of cooperation gives opportunities to provide high efficient and clean conversion of fossil fuels to electricity. Moreover, power plant consisting of few traditional power system gives new possibilities of optimization under partial loads.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 3-23
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Recrystallization Annealing on the Properties and Structure of Low-Carbon Ferritic Steel IF
Autorzy:
Kowalczyk, K.
Jabłońska, M.
Rusz, S.
Junak, G.
Powiązania:
https://bibliotekanauki.pl/articles/355122.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low-carbon IF steel
annealing
mechanical properties
microstructure
Opis:
This paper shows results of researches of a structure and mechanical properties of metal sheets of IF steels subjected to recrystallization annealing. The annealing was held in the scope of the temperature of 600-900°C over 25 min time. The impact of heat treatment on changes of properties and structure of the researches steel has been analysed. During annealing typical processes of rebuilding of the structure deformed as a result of cold deformation in the form of forming new recrystallized grains and their growth were observed. As the temperature of annealing increases the hardness of the material gradually decreases.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1957-1961
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the DRECE Process of Severe Plastic Deformation on the Mechanical Properties of the Ultra-Low Carbon Interstitial Free Steel
Autorzy:
Kowalczyk, K.
Jabłońska, M.
Rusz, S.
Bednarczyk, I.
Powiązania:
https://bibliotekanauki.pl/articles/352805.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sheet metal
high strength steel
interstitial free steel
SPD process
Opis:
This research paper shows the influence of a repeated SPD (Severe Plastic Deformation) plastic forming with the DRECE technique (Dual Rolls Equal Channel Extrusion) on hardening of low carbon IF steel. The influence of number of passes through the device on change of mechanical properties, such as tensile strength TS and yield stress YS, of tested steel was tested. The developed method is based on equal channel extrusion with dual rolls and uses a repeated plastic forming to refinement of structure and improve mechanical properties of metal bands [1-2]. For the tested steel the increase of strength properties after the DRECE process was confirmed after the first pass in relation to the initial material. The biggest strain hardening is observed after the fourth pass.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2095-2100
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery
Autorzy:
Ziółkowski, P.
Kowalczyk, T.
Hernet, J.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/175466.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
binary cycle
waste heat
ORC
thermodynamical analysis
numerical
analysis
CFM (computational flow mechanics)
Opis:
In this paper, thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery from exhaust gases are presented. According to that purpose, the CFM (computation flow mechanics) approach has been used correctly. In this paper, traditional steam cycle, the bottoming organic Rankine cycle (ORC) and a system of waste heat recovery with use of water with temperature 90 ◦C have been analyzed. The Szewalski binary vapour cycle is providing steam as the working fluid in the high temperature part of the cycle, while another fluid – organic working fluid – as the working substance substituting conventional steam over the temperature range represented by the low pressure steam expansion. The steam cycle for reference conditions, the Szewalski binary vapour cycle, and the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery have been comprised. Four working fluids in the low temperature part of binary cycle such as ammonia, propane, isobutene and ethanol have also been investigated. Moreover, the Szewalski cycle is a good resolution for proper using heat flux received from the exhaust gases heat regeneration system.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 51-75
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of powdery mildew resistance genes in common wheat [Triticum aestivum L.em.Thell.]. XI. Cultivars grown in Poland
Autorzy:
Kowalczyk, K
Hsam, S.L.K.
Zeller, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/2044252.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pathogen isolate
powdery mildew
protein quality
Polish agriculture
Polska
wheat
wheat cultivar
Erysiphe graminis f.sp.tritici
common wheat
Triticum aestivum
resistance gene
Opis:
A collection of common wheat cullivars grown in Poland were analyzed for resistance to powdery mildew disease by using eleven differential isolates of Erysiphe graminis f. sp. tritici (Blumeria graminis). Among a total of 69 accessions, 48 cultivars possessed resistance which is attributed to known resistance genes present either individually or in a combination. Four cultivars were resistant to all the isolates used and another four cultivars revealed race-specific resistance which does not correspond to the response patterns of previously documented resistance. Resistance genes Pm2 and Pm6 in a combination were most widely distributed, and genes Pm3d, Pm4b, Pm5 and Pm8 were also postulated.
Źródło:
Journal of Applied Genetics; 1998, 39, 3; 225-236
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of zero-dimensional model of SOFC with internal fuel reforming for complex hybrid energy cycles
Autorzy:
Badur, J.
Lemański, M.
Kowalczyk, T.
Ziółkowski, P.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/184970.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuel cell
SOFC
mathematical model
experiment
verification
ogniwo paliwowe
model matematyczny
eksperyment
weryfikacja
Opis:
The article presents a zero-dimensional mathematical model of a tubular fuel cell and its verification on four experiments. Despite the fact that fuel cells are still rarely used in commercial applications, their use has become increasingly more common. Computational Flow Mechanics codes allow to predict basic parameters of a cell such as current, voltage, combustion composition, exhaust temperature, etc. Precise models are particularly important for a complex energy system, where fuel cells cooperate with gas, gas-steam cycles or ORCs and their thermodynamic parameters affect those systems. The proposed model employs extended Nernst equation to determine the fuel cell voltage and steadystate shifting reaction equilibrium to calculate the exhaust composition. Additionally, the reaction of methane reforming and the electrochemical reaction of hydrogen and oxygen have been implemented into the model. The numerical simulation results were compared with available experiment results and the differences, with the exception of the Tomlin experiment, are below 5%. It has been proven that the increase in current density lowers the electrical efficiency of SOFCs, hence fuel cells typically work at low current density, with a corresponding efficiency of 45–50% and with a low emission level (zero emissions in case of hydrogen combustion).
Źródło:
Chemical and Process Engineering; 2018, 39, 1; 113--128
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Lactobacillus spp. and yeast based probiotic (Lavipan) supplementation for the reduction of Salmonella Enteritidis after infection of broiler chickens
Autorzy:
Smialek, M.
Kaczorek, E.
Szczucińska, E.
Burchardt, S.
Kowalczyk, J.
Tykałowski, B.
Koncicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/2087578.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chicken
probiotic
Salmonella Enteritidis
serological response
Źródło:
Polish Journal of Veterinary Sciences; 2019, 1; 5-10
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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