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    Wyświetlanie 1-12 z 12
    Tytuł:
    Selected application of the Chinese remainder theorem in multiparty computation
    Autorzy:
    Jakubski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/122387.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    multiparty cryptography
    secret sharing
    distributed algorithms
    modular arithmetic
    kryptografia wielopartyjna
    algorytmy rozproszone
    arytmetyka modularna
    Opis:
    In this paper we present protocols checking the equality of two distributed numbers and calculation of the product in such a way that the distributed numbers are unknown to anyone. The presented protocols use the Chinese Remainder Theorem. As a result, the obtained protocols have many interesting cryptographic features.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 39-47
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A picture that is something more than just a picture
    Autorzy:
    Dyja, R.
    Jakubski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/121667.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    digital picture
    steganography
    hiding information
    obraz cyfrowy
    steganografia
    ukrywanie informacji
    Opis:
    Our paper presents the ways of hiding information with the usage of a digital picture. A branch of science that deals with hiding messages in the wider media is called steganography. Due to the rapid expansion of Internet and the associated in rease in data exchange, this field appears to be a subject of interest. In this paper we present our own algorithms of hiding data in pictures and their implementations.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2011, 16; 111-116
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Quartz Sand Quality on Bending Strength and Thermal Deformation of Moulding Sands with Synthetic Binders
    Autorzy:
    Dobosz, S. M.
    Grabarczyk, A.
    Major-Gabryś, K.
    Jakubski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380092.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    quartz sand
    moulding sand
    synthetic resin
    hot distortion
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    piasek kwarcowy
    masa formierska
    żywica syntetyczna
    Opis:
    Modern techniques of castings production, including moulding sands production, require a strict technological regime and high quality materials. In the case of self-hardening moulding sands with synthetic binders those requirements apply mainly to sand, which adds to more than 98% of the whole moulding sand mixture. The factors that affect the quality of the moulding sands are both chemical (SiO2, Fe2O3 and carbonates content) and physical. Among these factors somewhat less attention is paid to the granulometric composition of the sands. As a part of this study, the effect of sand quality on bending strength Rgu and thermal deformation of self-hardening moulding sands with furfural and alkyd resin was assessed. Moulding sands with furfural resin are known [1] to be the most susceptible to the sand quality. A negative effect on its properties has, among others, high content of clay binder and so-called subgrains (fraction smaller than 0,1mm), which can lead to neutralization of acidic hardeners (in the case of moulding sands with furfuryl resin) and also increase the specific surface, what forces greater amount of binding agents. The research used 5 different quartz sands originating from different sources and characterized with different grain composition and different clay binder content.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 9-12
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Prediction of Moulding Sand Moisture Content Based on the Knowledge Acquired by Data Mining Techniques
    Autorzy:
    Regulski, K.
    Jakubski, J.
    Opaliński, A.
    Brzeziński, M.
    Głowacki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355982.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    application of information technology to the foundry industry
    moulding sands
    decision trees
    ANOVA
    data mining
    Opis:
    The subject of the study is the improvement of the quality of moulding sand preparation. An exploration research performed on the data concerning moulding sand quality parameters was described. The aim of the research was to find relationships between various factors determining the properties of moulding sands and, based on the results obtained, build models predicting the sand moisture content with the induction of classification and regression trees. A two-match prediction approach was demonstrated and its effectiveness in evaluating the moulding sand moisture content was discussed. The knowledge in the form of rules acquired in this way can be used in the creation of knowledge bases for systems supporting decisions in the diagnostics of the moulding sand rebonding process. Formalized knowledge also facilitates further processing of the measurement data.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1709-1714
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Thermal Deformation of Hot-box Moulding Sands
    Autorzy:
    Grabarczyk, A.
    Major-Gabryś, K.
    Dobosz, S. M.
    Jakubski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381390.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry material
    innovative foundry technology
    mechanical properties
    moulding sand deformation
    hot distortion
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    właściwości mechaniczne
    odkształcenie masy formierskiej
    deformacja cieplna
    Opis:
    The constantly developing and the broadly understood automation of production processes in foundry industry, creates both new working conditions - better working standards, faster and more accurate production - and new demands for previously used materials as well as opportunities to generate new foundry defects. Those high requirements create the need to develop further the existing elements of the casting production process. This work focuses on mechanical and thermal deformation of moulding sands prepared in hot-box technology. Moulding sands hardened in different time periods were tested immediately after hardening and after cooling. The obtained results showed that hardening time period in the range 30-120 sec does not influence the mechanical deformation of tested moulding sands significantly. Hot distortion tests proved that moulding sands prepared in hot-box technology can be characterized with stable thermal deformation up to the temperature of circa 320 °C.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 55-58
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Additive "B" on the Properties of CO2-Hardened Foundry Sands with Hydrated Sodium Silicate
    Autorzy:
    Kamińska, J.
    Angrecki, M.
    Palma, A.
    Jakubski, J.
    Wildhirt, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/352315.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    moulding sand
    hydrated sodium silicate
    additive “B”
    Opis:
    The results of own studies concerning the application of a new additive to the CO2-hardened sodium water glass foundry sands are presented. The new additive, which is a composition of aqueous solutions of modified polyalcohols, has been designated by the symbol “B” and is used as an agent improving the sand knocking out properties. The scope of studies included various mechanical and technological properties of foundry sand mixtures, such as permeability, friability, life cycle of cores and knocking out properties. Two types of water glass with different values of the silica modulus and density, designated as R145 and R150, were tested. Moulding sands used in the tests were made with the additive “B”. For comparison, a reference sand mixture with water glass but without the additive “B” was also prepared.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1637-1641
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastyczność – nowe kryterium oceny jakości mas formierskich
    Elasticity - a New Quality Assessment Criterion for Moulding Sands
    Autorzy:
    Grabarczyk, A.
    Dobosz, S. M.
    Major-Gabryś, K.
    Jakubski, J.
    Morek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380078.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    masa samoutwardzalna
    masa sypka
    elastyczność
    deformacja cieplna
    moulding sand
    self hardening moulding sand
    elasticity
    hot distortion
    Opis:
    Współczesne odlewnictwo cechuje wysoki stopień automatyzacji w procesach produkcji masowej. Wspomaganie procesów zakładania rdzeni i składania form odlewniczych przez wszelkiego rodzaju manipulatory oraz roboty przyczynia się do pękania form oraz rdzeni podczas montażu. Często występujące uszkodzenia rdzeni są wynikiem niskiej elastyczności mas formierskich, nawet przy wysokiej wytrzymałości rdzeni. W celu zbadania tego zjawiska opracowany został specjalny moduł pomiarowy połączony z klasycznym pomiarem skłonności mas do odkształceń w wysokich temperaturach – hot distortion. W ramach niniejszej pracy przedstawiona zostanie szczegółowo metodyka pomiaru oraz wstępne badania elastyczności i deformacji cieplnej dla sypkich mas samoutwardzalnych ze spoiwem furfurylowym oraz alkidowym o określonych składach.
    Modern casting is characterized by a high degree of automation in the processes of mass production. Supporting the processes of inserting cores and composing the moulds with all kinds of manipulators and robots leads to breakage of both cores and moulds during installation. Common core damages are the result of low elasticity of the moulding sands, despite high strength resistance of the cores. In order to investigate this phenomenon a special measuring module, connected with a classical measurement of the tendency of moulding sands to deform in high temperatures-hot distortion, has been developed. Within the framework of this paper the methods of measurement and preliminary research of elasticity and thermal deformation of self-hardening moulding sands with furfuryl and alkyd binders will be presented.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 39-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Deformation of Moulding and Core Sands with an Inorganic Binder Containing a Relaxation Additive
    Autorzy:
    Bobrowski, A.
    Drożyński, D.
    Jakubski, J.
    Szumera, M.
    Kaczmarska, K.
    Grabowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381739.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    inorganic binder
    geopolymer binder
    thermal deformation
    dilatometric studies
    masa formierska
    spoiwo nieorganiczne
    spoiwo geopolimerowe
    odkształcanie termiczne
    badania dylatometryczne
    Opis:
    The paper presents the results of an investigation of the thermal deformation of moulding sands with an inorganic (geopolymer) binder with a relaxation additive, whose main task is to reduce the final (residual) strength and improves knocking-out properties of moulding sand. The moulding sand without a relaxation additive was the reference point. The research was carried out using the hot-distortion method (DMA apparatus from Multiserw-Morek). The results were combined with linear deformation studies with determination of the linear expansion factor (Netzsch DIL 402C dilatometer). The study showed that the introduction of relaxation additive has a positive effect on the thermal stability of moulding sand by limiting the measured deformation value, in relation to the moulding sand without additive. In addition, a relaxation additive slightly changes the course of the dilatometric curve. Change in the linear dimension of the moulding sand sample with the relaxation additive differs by only 0.05%, in comparison to the moulding sand without additive.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 93-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Welcome to the Journal of Casting and Materials Engineering
    Autorzy:
    Grabowska, B.
    Górny, M.
    Brzeziński, M.
    Jakubski, J.
    Bobrowski, A.
    Kaczmarska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/106971.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wstęp
    nota edytorska
    introduction
    editorial
    Źródło:
    Journal of Casting & Materials Engineering; 2017, 1, 1; 1
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Cupola Furnace and Blast Furnace Slags with Respect to Possibilities of Their Utilization
    Autorzy:
    Pribulová, A.
    Futáš, P.
    Petrík, J.
    Pokusová, M.
    Brzeziński, M.
    Jakubski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/350993.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cupola furnace slag
    blast furnace slag
    chemical composition
    melting temperature
    microstructure of slag
    Opis:
    Blast furnace and cupola furnace are furnace aggregates used for pig iron and cast iron production. Both furnace aggregates work on very similar principles: they use coke as the fuel, charge goes from the top to down, the gases flow against it, etc. Their construction is very similar (cupola furnace is usually much smaller) and the structures of pig iron and cast iron are very similar too. Small differences between cast iron and pig iron are only in carbon and silicon content. The slags from blast furnace and cupola furnace are very similar in chemical composition, but blast furnace slag has a very widespread use in civil engineering, primarily in road construction, concrete and cement production, and in other industries, but the cupola furnace slag utilization is minimal. The contribution analyzes identical and different properties of both kinds of slags, and attempts to explain the differences in their uses. They are compared by the contribution of the blast furnace slag cooled in water and on air, and cupola furnace slag cooled on air and granulated in water. Their chemical composition, basicity, hydraulicity, melting temperature and surface were compared to explain the differences in their utilization.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1865-1873
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Molding Sand Elasticity
    Autorzy:
    Major-Gabryś, K.
    Grabarczyk, A.
    Dobosz, S.M.
    Jakubski, J.
    Morek, J.
    Beňo, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/106977.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    molding sands
    mechanical deformation
    elasticity
    hot-distortion
    Opis:
    The progressive mechanization and automation of industrial equipment is the driving force of progress, not only in the field of production but also in the measuring and control equipment. In mold production, the automation of processes such as forming molds and cores along with their assembly has led to increases in serial production, reductions in defects, and the shortening of molding times, among others. Thanks to automation in mold and core departments and the use of all sorts of manipulators, mold production in foundries has gained momentum. Unfortunately, in addition to the mentioned advantages, there are also new challenges as to the quality and properties of the molding and core sands used in highly automated foundries.This article presents recent research on molding sand elasticity. The topic was introduced as an attempt to answer the new needs of highly mechanized foundries. The article discusses a new method of measuring the resistance of molding materials to undergoing mechanical deformation (molding sand elasticity), with an additional analysis of the bending strengths of the tested samples. Precise measurements, test sample preparation, and interpretation of the received results are presented in the article.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 2; 38-44
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Moulding Sand Type on Mechanical and Thermal Deformation
    Autorzy:
    Grabarczyk, A.
    Major-Gabryś, K.
    Dobosz, S. M.
    Jakubski, J.
    Bolibruchová, D.
    Brůna, M.
    Pastirčák, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353843.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    moulding sand
    core sand
    organic binder
    inorganic binder
    mechanical deformation
    thermal deformation
    Opis:
    Casting industry has been enriched with the processes of mechanization and automation in production. They offer both better working standards, faster and more accurate production, but also have begun to generate new opportunities for new foundry defects. This work discusses the disadvantages of processes that can occur, to a limited extend, in the technologies associated with mould assembly and during the initial stages of pouring. These defects will be described in detail in the further part of the paper and are mainly related to the quality of foundry cores, therefore the discussion of these issues will mainly concern core moulding sands. Four different types of moulding mixtures were used in the research, representing the most popular chemically bonded moulding sands used in foundry practise. The main focus of this article is the analysis of the influence of the binder type on mechanical and thermal deformation in moulding sands.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 347-351
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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