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    Wyświetlanie 1-12 z 12
    Tytuł:
    Microstructure and Creep Resistance of Mg-Al-Ca-Sr Alloys
    Mikrostruktura i odporność na pełzanie stopów magnezu Mg-Al-Ca-Sr
    Autorzy:
    Rzychoń, T.
    Adamczyk-Cieślak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355876.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast magnesium alloys
    Mg-Al-Ca-Sr alloys
    microstructure
    mechanical properties
    odlewnicze stopy magnezu
    stopy Mg-Al-Ca-Sr
    mikrostruktura
    właściwości mechaniczne
    Opis:
    Microstructure and creep properties of cast Mg-Al-Ca-Sr alloys have been investigated. The microstructure was characterized using light microscopy, scanning and transmission electron microscopy. Phase identification was made by EBSD technique and by SAED analysis. The measurement of volume fraction of intermetallic phases was performed using quantitative metallography. Creep tests were performed at 180°C and at applied stress between 45 and 90 MPa. Microstructure of tested alloys composed of α-Mg grains and intermetallic compounds in the interdendritic regions. It was found that the addition of calcium and strontium improves creep resistance at 180°C.
    W artykule przedstawiono wyniki badań mikrostruktury i odporności na pełzanie odlewniczych stopów magnezu Mg-Al-Ca-Sr. Mikrostrukturę badano metodami mikroskopii świetlnej, skaningowej i elektronowej transmisyjnej. Identyfikacji faz dokonano metodami EBSD i dyfrakcji elektronów (TEM). Pomiar udziałów objętościowych faz dokonano za pomocą metalografii ilościowej. Badania odporności na pełzanie przeprowadzono w temperaturze 180°C przez 100 h. Mikrostruktura badanych stopów składa się z ziaren roztworu stałego α-Mg i faz międzymetalicznych w przestrzeniach międzydendrytycznych. Stwierdzono, że dodatek wapnia i strontu poprawia odporność na pełzanie w temperaturze 180°C.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 329-334
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A self-stabilising multipurpose single-wheel robot
    Samostabilizujący się uniwersalny jednokołowy robot
    Autorzy:
    Buratowski, T.
    Cieślak, P.
    Giergiel, M.
    Uhl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/281977.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    single-wheel robot
    nonholonomic single-wheel robot
    stabilization
    control design
    Opis:
    This article presents a design process of a single-wheel robot which consists of building a theoretical model, designing a mechanical structure, simulating the design, building a prototype and testing it. It describes the control strategy for this vehicle, developed during the simulation process, and how it works for a ready built prototype. It mainly focuses on the self-stabilisation problem encountered in the single-wheel structure and shows the test rig results for this case. The design of the robot is under patent protection.
    Praca przedstawia zgłoszoną do opatentowania konstrukcję jednokołowego robota anholonomicznego, wyposażonego w układ sterowania oraz system stabilizacji bazujący na budowie odwróconego wahadła fizycznego.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2012, 50, 1; 99-118
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnesium - an important component of high-energy compositions
    Magnez - istotny składnik mieszanin wysokoenergetycznych
    Autorzy:
    Zygmunt, A.
    Cieslak, K.
    Golofit, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/14046.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Magnesium is a widely used component in high-energy compositions. Mixtures containing this metal can be found in show and military pyrotechnics, rocket propellants and various explosive masses. Magnesium containing compositions have high combustion temperature, which allows one to achieve the desired special effect. Two important stages in designing new high-energy mixtures, i.e. compatibility of substances and optimal composition, were described. The calculations were based on mixtures containing magnesium. In line with the standard STANAG 4147, using differential scanning calorimetry, compatibilities of mixtures of magnesium with octogen (HMX) and magnesium with hekzaazahekzanitroizowurzitane (CL-20) were examined. Magnesium is compatible with these nitroamines. An optimal composition which ensures the maximum combustion temperature and specific impulse was determined using the calculation programme isp2001. The optimum composition of the Mg : HMX composition burns at a lower temperature than the Mg : CL-20 mixture. The combustion temperature was 3493K for the former mixture and 3807K for the latter one. The specific impulse determined for both compositions was 273s. The specific impulse was established for mixtures with different shares of magnesium. The mixture containing in octogen reached the maximum specific impulse at 5% Mg, while the mixture containing CL-20 reached the highest specific impulse at 15% of this metal. The dependence of the specific impulse of rocket propellant containing polybutadiene with terminal hydroxyl groups (HTPB), ammonium perchlorate and magnesium was examined. The maximum value of the impulse increases with a decreasing amount of the binder. When another binder such as for poly(glycidyl azide) (GAP) was used, a reverse relationship was observed. The specific impulse increased with an increased binder content. The influence of various oxidants on the combustion temperature of pyrotechnic mixtures was defined. The highest combustion temperature was achieved for compositions with the magnesium content in the range of 20 to 45%. The effect on combustion temperature of the oxidants polytetrafluoroethylene, potassium chlorate and iron oxide was compared.
    Źródło:
    Journal of Elementology; 2014, 19, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural hybridization between Elymus repens and Elymus hispidus assessed by AFLP analysis
    Autorzy:
    Szczepaniak, M
    Cieslak, E.
    Bednarek, P.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/58862.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    pollen fertility
    Polska
    hybridization
    hybrid
    botany
    flora
    new species
    Elymus x mucronatus
    Elymus hispidus
    Elymus repens
    genetic variation
    Opis:
    Hybrid speciation within the genus Elymus is analyzed and discussed. The supposed hybrid origin of Elymus x mucronatus between Elymus repens and Elymus hispidus was tested. In this aim, pollen viability and AFLP variation of putative progenitors and progenies from two natural populations were studied. Pollen fertility of hybrids ranging from 0 to 91.95% (average 59.50%) indicates the occurrence of F1 hybrids and backcross hybrids. Seven EcoRI/MseI AFLP primer combinations generated a total of 477 AFLP fragments (300 polymorphic) for 48 parental and hybrid individuals. UPGMA and principal coordinates analysis of the AFLP data set show that hybrids are closer to E. hispidus than to E. repens and suggest unidirectional introgression towards E. hispidus. AFLP fragments of the hybrid taxon were additively inherited from the parental species and no hybrid-specific bands were identified. AFLP analysis validates the hybrid status of E. ×mucronatus. Populations in which E. repens, E. hispidus and their hybrids co-occur still progress from early hybridization stages of F1 hybrids to an advanced hybridization stage of a well-established hybrid swarm. E. ×mucronatus is potentially self-sustaining by predominant vegetative reproduction by rhizomes and partial fertility leading to the development of mature seeds. We propose to consider Elymus ×mucronatus as a new species of hybrid origin in the Polish flora.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2007, 76, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    People identification based on dynamic determinants of human gait
    Autorzy:
    Michałowska, M.
    Walczak, T.
    Grabski, J. K.
    Cieślak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/128208.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    people identification
    human gait
    force plate
    artificial neural networks
    rozpoznawanie osób
    chód człowieka
    platforma siłowa
    sztuczne sieci neuronowe
    Opis:
    In the paper a way of people identification, based on ground reaction forces during gait, is presented. The authors established that each individual has an unique gait pattern that can be described by quantitative parameters, calculated using measurements coming from the force plates. Fifteen volunteers took part in this study. Each person walked barefoot at least 100 times through 10-m-long walkway with the force plates built in. Determinants were calculated based on vertical and anterior-posterior components of the ground reaction force. The obtained parameters were used as an input matrix of the artificial neural network designed for identification of each person. Effectiveness of the recognition was assessed as root mean square error between expected and obtained output values. It was proved, that human identification based on presented determinants of the gait and artificial neural network is possible at a high level.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application and properties of aluminum in primary and secondary explosives
    Autorzy:
    Zygmunt, A.
    Gańczyk, K.
    Kasztankiewicz, A.
    Cieślak, K.
    Gołofit, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190129.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    aluminum
    primary explosives
    secondary explosives
    detonation parameters
    Opis:
    Aluminum is an easily available and cheap material, which is widely used in military and civil industries, e.g. in space technology, explosion welding, mining, production of oil and natural gas, manufacture of airbags. Primary and secondary explosives containing aluminum are described in this part of the work. Aluminum is added to high explosives of different shapes and sizes. These parameters influence inter alia detonation velocity (D), explosion heat, detonation pressure, pressure impulse and thermal stability. Detonation parameters of high explosive (HE) containing aluminum have been determined for binary systems consisting of high explosive or oxidizer and aluminum, plastic bonded explosives (PBX), melt cast explosives, thermobaric explosives (TBX), ammonium nitrate fuel oil (ANFO). Aluminum causes different effects on detonation velocity and explosion heat depending on the type of high explosive in binary systems. The dependence of the aluminum content in a mixture with ammonium nitrate with detonation velocity increased for an aluminum range from 0 to 10%, changed little between 10 and 16% of aluminum added and decreased from 16 to 40% of the aluminum content. For an aluminum content higher than 40%, the detonation process was not observed. The performance of explosives can be determined by the shock wave intensity. An increase in the pressure impulse made Al particle react with gaseous products and the air behind the front of detonation wave. The addition of aluminum also influences the thermal stability of high explosive materials.
    Źródło:
    Journal of Elementology; 2017, 22, 2; 747-759
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application and properties of aluminum in primary and secondary explosives
    Autorzy:
    Zygmunt, A.
    Gańczyk, K.
    Kasztankiewicz, A.
    Cieślak, K.
    Gołofit, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/963927.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Aluminum is an easily available and cheap material, which is widely used in military and civil industries, e.g. in space technology, explosion welding, mining, production of oil and natural gas, manufacture of airbags. Primary and secondary explosives containing aluminum are described in this part of the work. Aluminum is added to high explosives of different shapes and sizes. These parameters influence inter alia detonation velocity (D), explosion heat, detonation pressure, pressure impulse and thermal stability. Detonation parameters of high explosive (HE) containing aluminum have been determined for binary systems consisting of high explosive or oxidizer and aluminum, plastic bonded explosives (PBX), melt cast explosives, thermobaric explosives (TBX), ammonium nitrate fuel oil (ANFO). Aluminum causes different effects on detonation velocity and explosion heat depending on the type of high explosive in binary systems. The dependence of the aluminum content in a mixture with ammonium nitrate with detonation velocity increased for an aluminum range from 0 to 10%, changed little between 10 and 16% of aluminum added and decreased from 16 to 40% of the aluminum content. For an aluminum content higher than 40%, the detonation process was not observed. The performance of explosives can be determined by the shock wave intensity. An increase in the pressure impulse made Al particle react with gaseous products and the air behind the front of detonation wave. The addition of aluminum also influences the thermal stability of high explosive materials.
    Źródło:
    Journal of Elementology; 2017, 22, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Precipitation Processes and Mechanical Properties of Aged Inconel 718 Alloy after Annealing
    Autorzy:
    Maj, P.
    Adamczyk-Cieślak, B.
    Slesik, M.
    Mizera, J.
    Pieja, T.
    Sieniawski, J.
    Gancarczyk, T.
    Dudek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352832.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inconel 718
    mechanical properties
    heat treatment
    Opis:
    Inconel 718 is a precipitation hardenable nickel-iron based superalloy. It has exceptionally high strength and ductility compared to other metallic materials. This is due to intense precipitation of the γ’ and γ” strengthening phases in the temperature range 650-850°C. The main purpose of the authors was to analyze the aging process in Inconel 718 obtained in accordance with AMS 5596, and its effect on the mechanical properties. Tensile and hardness tests were used to evaluate the mechanical properties, in the initial aging process and after reheating, as a function of temperature and time respectively in the ranges 650°-900°C and 5-480 min. In addition, to link the mechanical properties with the microstructure transmission microscopy observations were carried out in selected specimens. As a result, factors influencing the microstructure changes at various stages of strengthening were observed. The authors found that the γ’’ phase nucleates mostly homogenously in the temperature range 650-750°C, causing the greatest increase in strength. On the other hand, the γ’ and δ phases are formed heterogeneously at 850°C or after longer annealing in 800°C, which may weaken the material.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1695-1702
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer and magnetic studies of FeCoNiCuNbSiB nanocrystalline alloys
    Autorzy:
    Grabias, A.
    Basykh, V.
    Ferenc, J.
    Cieślak, G.
    Kulik, T.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146338.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous ribbons
    nanocrystalline alloys
    Mössbauer spectroscopy
    soft magnetic properties
    Opis:
    Nanocrystalline Fe80–x–yCoxNiyCu1Nb3Si4B12 alloys were prepared by the annealing of amorphous ribbons. Primary crystallization of the alloys annealed at temperatures of between 500 and 550°C was studied by X-ray diffraction and Mössbauer spectroscopy. Magnetic properties of the alloys were investigated using a hysteresis loop tracer and vibrating sample magnetometer. The annealed ribbons are composed of a two-phase nanostructure consisting of bcc Fe-based grains embedded in an amorphous matrix. Conversion electron Mössbauer spectroscopy (CEMS) measurements reveal a more advanced crystallization process in the surface layers when compared with the volume of the ribbons. The degree of saturation magnetization of the nanocrystalline alloys is of about 1.5 T. The coercive fi eld varies from 1.0 to 6.5 A/m and peaks at an annealing temperature of 525°C. Magnetic softening of the nanocrystalline alloys observed after annealing at 550°C is correlated with a volume fraction of the nanocrystalline bcc phase.
    Źródło:
    Nukleonika; 2017, 62, 2; 79-84
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application and properties of aluminum in rocket propellants and pyrotechnics
    Autorzy:
    Kasztankiewicz, A.
    Ganczyk-Specjalska, K.
    Zygmunt, A.
    Cieslak, K.
    Zakoscielny, B.
    Golofit, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/15933.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Źródło:
    Journal of Elementology; 2018, 23, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entropy Change Calculations for Pure Gd and a Ni-Mn-Cu-Ga Heusler Alloy: Constant Field vs. Constant Temperature Experiment
    Autorzy:
    Ferenc, J.
    Kowalczyk, M.
    Wróblewski, R.
    Cieślak, G.
    Sielicki, K.
    Leonowicz, M.
    Kulik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402338.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    65.40.gd
    Opis:
    The magnetocaloric effect may be assessed indirectly by expressing it as the change in magnetic entropy in varying magnetic field, H, as the function of temperature, T. Magnetization, M=f(T,H), may be experimentally acquired from a series of isothermal measurements with variable field, or from a series of constant field measurements with variable temperature. The accuracy of magnetic entropy calculation depends on the number of series in these experiments. The aim of this work is to determine how little data is sufficient to obtain accurate results of magnetic entropy change calculations, on the basis of real, magnetocaloric materials. Pure gadolinium and a Ni-Mn-Cu-Ga Heusler alloy were studied. For both materials, the magnetic entropy change and relative cooling power were calculated from both experiments, with the decreasing number of experimental data. For both materials, the constant field experiment with only 6 field values provided only a 5% error of calculations, as compared to the experiment with 100 field values. The Arrott plots were also drawn for constant field mode with 6 field values, easily indicating the order of transition. Comparison of the calculation results suggests that the constant field mode magnetization measurement may be more accurate and faster than isothermal mode.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 111-115
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of the Formation of Non-Metallic Precipitates During a Continuous Casting of Steel
    Autorzy:
    Kalisz, D.
    Żak, P. L.
    Tokarski, T.
    Wzorek, Ł.
    Suchy, J. S.
    Kiczor, M.
    Cieślak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/958226.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-metallic oxide precipitates
    modelling
    continuous casting of steel
    crystallization
    Opis:
    The authors own computer software, based on the Ueshima mathematical model with taking into account the back diffusion, determined from the Wołczyński equation, was developed for simulation calculations. The applied calculation procedure allowed to determine the chemical composition of the non-metallic phase in steel deoxidised by means of Mn, Si and Al, at the given cooling rate. The calculation results were confirmed by the analysis of samples taken from the determined areas of the cast ingot. This indicates that the developed computer software can be applied for designing the steel casting process of the strictly determined chemical composition and for obtaining the required non-metallic precipitates.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 335-340
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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