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    Wyświetlanie 1-11 z 11
    Tytuł:
    In search of stratigraphic subdivision of the period 8–0 ka in Greenland ice cores
    Autorzy:
    De Jong, Matheus G.G.
    Seijmonsbergen, Arie C.
    De Graaff, Leo W.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041900.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Holocene
    ice cores
    stratigraphy
    pattern matching
    Źródło:
    Polish Polar Research; 2019, 40, 2; 55-77
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Acoustic Emission Signals Originating from the Core Magnetization of Power Oil Transformer
    Autorzy:
    Olszewska, A.
    Witos, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/177181.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power oil transformers
    magnetization of transformers cores
    magnetoacoustic emission
    Opis:
    In this paper, the properties of AE signals originating from phenomena occurring during magnetization of ferromagnetic materials which are used to construct power transformer cores are presented. The AE signals in a selected power oil transformer were recorded and analyzed. The analysis included, i.e., time, frequency, and time-frequency analyses, calculations of amplitude distributions of the signals and defined AE descriptors, determination of the descriptor map on the side walls of transformers, as well as a detailed analysis of selected part of the signals. The maps of descriptors were analyzed in the frequency bands of 20–70 kHz, 70–100 kHz, and 100–200 kHz. The analysis of the properties of the signals was performed in time and frequency domains. Based on the analysis, there were identified the AE signals originating from the phenomena occurring during the core magnetization of a power oil transformer. To identify those phenomena, the maps of the ADC descriptor calculated in the band of 20–70 kHz when selecting the measurement points in which there were no AE sources from partial discharges were used. An analysis of magnetoacoustic emission signals in the bands of 70–100 kHz and 100–200 kHz was also performed. The analysis of the signal properties in such an extended frequency range allowed determining the properties of the magnetoacoustic signals coming from core sheets of power oil transformers.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 799-812
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advances in Technology of Soluble Cores for Die Castings
    Autorzy:
    Jelínek, P.
    Adámková, E.
    Mikšovský, F.
    Beňo, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380425.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    salt cores
    manufacture
    squeezing
    shooting
    cooking salt
    bonding of cores
    salinity
    cleaning water
    electric conductance
    rdzeń solny
    wytwarzanie
    wyciskanie
    sól kuchenna
    oczyszczanie wody
    przewodnictwo elektryczne
    Opis:
    A number of technologies is developed that substitute simple metal cores in the high-pressure casting technology. Soluble cores, namely on the salt basis, represent the highest prospect. The contribution gives the results of the production of salt cores by high-pressure squeezing and shooting with using a binder. Special attention is paid to the shape of NaCl salt crystals with additives and the influence on strength properties of cores. A technology of bonding the salt cores is developing. Salinity of circulating water is studied and it is checked with the aid of electrical conductance.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameters of the two-phase sand-air stream in the blowing process
    Autorzy:
    Dańko, J.
    Dańko, R.
    Burbelko, A. A.
    Skrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380343.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rdzeń odlewniczy
    badania eksperymentalne
    obliczenia symulacyjne
    foundry cores
    blowing processes
    shooting processes
    experimental investigations
    simulation calculations
    Opis:
    Theoretical problems concerning the determination of work parameters of the two-phase sand-air stream in the cores making process by blowing methods as well as experimental methods of determination of the main and auxiliary parameters of this process decisive on the cores quality assessed by the value and distribution of their apparent density are presented in the paper. In addition the results of visualisations of the core-box filling with the sand-air stream, from the blowing chamber, obtained by the process filming by means of the quick-action camera are presented in the paper and compared with the results of simulation calculations with the application of the ProCast software.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 25-30
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determinanty i bariery w procesie zmiany ścieżki rozwoju niemieckiego regionu Brandenburgii
    Autorzy:
    Dąbrowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2022459.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Berlin-Brandenburg Metropolitan Region
    capital city effect
    clusters
    regional growth cores (Regionale Wachstumskerne)
    territorial and sectoral concentration
    Źródło:
    Studia komitetu przestrzennego zagospodarowania kraju PAN; 2017, 179; 135-154
    0079-3507
    Pojawia się w:
    Studia komitetu przestrzennego zagospodarowania kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conceptual Design of a Core Making System
    Autorzy:
    Asłanowicz, M.
    Dańko, J.
    Dańko, R.
    Fedoryszyn, A.
    Fulko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/383204.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry cores
    blowing process
    shooting process
    experimental investigations
    simulation calculations
    rdzeń odlewniczy
    wstrzeliwanie
    badania eksperymentalne
    obliczenia symulacyjne
    Opis:
    The paper presents the topics related with the production of small and medium-sized cores by means of blowing methods. The basic information concerning the manufacturers of the blowing machines and the general characteristics of machines offered by them are presented. The basic design of blowing machines are presented with discussions of the theoretical works of Boenisch, Axionov and J. Dańko determining important from the technology point of view sand and air flow parameters including different methods of core box filling factors and the factor eV representing the sand ability to evacuate from the shooting chamber.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 13-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Core Blowing Process - Assessment of Core Sands Properties and Preliminary Model Testing
    Autorzy:
    Dańko, R.
    Dańko, J.
    Burbelko, A.
    Skrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380188.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry cores
    blowing processes
    shooting processes
    experimental investigations
    simulation calculations
    rdzenie odlewnicze
    wstrzeliwanie
    proces szybkiego łączenia
    badania eksperymentalne
    obliczenia symulacyjne
    Opis:
    The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting) depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number, distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand. Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties on the basis of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability factor provide a better possibility of assessing the core sand behaviour during flowing and core box filling, which indicate the value and structure of the obtained compacting decisive – after hardening – for strength and permeability. The mentioned above aspects are analysed – on the basis of authors’ own examinations - in the hereby paper.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern Alphaset (APNB) Flexible Formulations-Enhanced Performance
    Autorzy:
    Ghosh, D. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837863.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    make molds and cores
    sand binder
    resin performance
    alkaline phenolic no-bake
    APNB
    wytwarzenie form i rdzeni
    spoiwo piaskowe
    właściwości żywic
    Opis:
    APNB (alkaline phenolic no bake), widely known as Alphaset is one of the major sand binder systems used in foundries to make molds and cores without application of heat or gas. This is a two part system comprising of a phenol-formaldehyde resin in alkaline medium as binder and range of esters of dibasic acids and/or polyhydric alcohols as hardeners. Resin performance varies depending upon formulations. Major variables in formulations are mole ratio of phenol: formaldehyde, total alkali content, ratio of two alkalis (NaOH & KOH) and molecular weight of polymers i.e. chain length. In present work, one mole ratio of phenol & formaldehyde has been chosen to prepare 8 resins [...].
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 18-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Mechanical Properties of Cast Ceramic Cores Based on Ethyl Silicate
    Autorzy:
    Bořil, Petr
    Kaňa, Václav
    Myška, Martin
    Krutiš, Vladimír
    Powiązania:
    https://bibliotekanauki.pl/articles/2203935.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ethyl silicate
    Shaw process
    cast cores
    ceramics
    fibre reinforcement
    mechanical properties
    krzemian etylu
    proces Shawa
    rdzenie odlewane
    ceramika
    zbrojenie włóknami
    właściwości mechaniczne
    Opis:
    The aim of the paper is experimental verification of the influence of the composition of the ceramic mixture on the mechanical properties of cast ethyl silicate cores. Cast ceramic cores have a great potential in the production of complex castings, especially in the field of hydropower. However, the disadvantage of the cast ceramic cores is their low strength during cores removing from the core box and handling with them. The research is focused mainly on the possibilities of increasing the handling strength of the cores during removal from the core box and after their ignition. The paper investigates different ways of increasing the strength of cast ceramic cores by adjusting the composition of the ceramic mixture. Further, the research verifies the possibility of increasing the strength of ceramic cores by adding synthetic fibers to the ceramic mixture. The paper also contains the results of measuring the strength of the cores after impregnation with a solution of phosphorous binder and subsequent annealing.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 47--52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lost Cores for High-Pressure Die Casting
    Autorzy:
    Jelinek, P.
    Adámková, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379956.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    product development
    salt cores
    high-pressure die casting
    squeezing-injection
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    rozwój produktów
    odlewnictwo wysokociśnieniowe
    rdzeń
    Opis:
    Development of salt cores prepared by high-pressure squeezing and shooting with inorganic binders has shown a high potential of the given technology even for high-pressure casting of castings. Strength, surface quality of achieved castings, and solubility in water become a decisive criterion. The shape and quality of grain surface particularly of NaCl – cooking salts that can be well applied without anticaking additives has shown to be an important criterion. Thus the salt cores technology can cover increasingly growing demands for casting complexity especially for the automobile industry.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 101-104
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Liquid Glass Mixtures with Improved Knocking-Out Ability in Castings Production for Railway Transport
    Autorzy:
    Svinoroev, Y.
    Batyshev, K.
    Deev, V.
    Semenov, K.
    Bykadorov, V.
    Prusov, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379925.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    liquid glass mixtures
    softening additives
    steel casting
    large-size castings
    castings production for railway transport
    molds and cores
    ciekłe szkło
    dodatki zmiękczające
    odlewy stalowe
    odlewy wielkogabarytowe
    odlewy do transportu kolejowego
    rdzenie
    formy
    Opis:
    Analysis of the use of the Russian materials (liquid glass and softening additives) has been made in accordance with the modern requirements for use in the technological processes of casting as binding materials in the production of large-sized steel railway casting. The reasons for poor knockout of liquid glass mixtures have been investigated. A complex action softening additive has been recommended for a better knocking-out ability. This solution provides a softening effect at the points of maximum formation of the liquid glass matrix strength in the processes of polymorphic transformation of the material under the influence of elevated temperatures as the result of filling the mold cavity by the melt. It has been shown that the use of additives of complex action leads to the decrease in the specific work of the knockout by four – seven times depending on the composition of the mixture and the design features of the casting. Experimental-industrial tests of the proposed method for softening the liquid glass mixtures have been made and the "Front Buffer Stop" casting has been made (for the rolling stock of locomotives and railway wagons). The tests confirmed the effectiveness and expediency of implementation of new liquid glass mixtures with softening additives in conditions of foundry enterprises.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 27-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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