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    Wyświetlanie 1-23 z 23
    Tytuł:
    On effective algorithms solving regularity of Markov chains
    Efektywne algorytmy rozstrzygania regularności łańcuchów Markowa
    Autorzy:
    Dańko, A.
    Sawicka, A.
    Dańko, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/88396.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    łańcuch Markowa
    ergodyczny łańcuch Markowa
    regularny łańcuch Markowa
    Markov chain
    ergodic Markov chain
    regular Markov chain
    Opis:
    We propose algorithms deciding whether a Markov chain with an n_n transition matrix M is regular. The lowest complexity of such an algorithm can be not greater than O(n 3 ) and we argue that it cannot be essentially diminished.
    W pracy proponujemy algorytmy rozstrzygające regularność łańcuchów Markowa o macierzy przejść rozmiaru n x n. Najniższa złożoność takiego algorytmu może być nie większa niż O(n 3 i podana jest argumentacja, że nie można jej istotnie obniżyć.
    Źródło:
    Advances in Computer Science Research; 2016, 13; 5-25
    2300-715X
    Pojawia się w:
    Advances in Computer Science Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multilayered ZnO Films of Improved Quality Deposited by Magnetron Sputtering
    Autorzy:
    Ievtushenko, A.
    Karpyna, V.
    Lashkarev, G.
    Lazorenko, V.
    Baturin, V.
    Karpenko, A.
    Lunika, M.
    Dan'ko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811931.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.15.Cd
    61.05.cp
    68.55.jm
    Opis:
    Multilayered ZnO films were deposited by rf magnetron sputtering on silicon and sapphire substrates. The aim of this work is to improve structural quality of ZnO thin films grown on just listed substrates. Presented X-ray diffraction data testify to remarkable relaxation of compressive stress in two- and three-layered ZnO films in comparison with single-layer one.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1131-1137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    Examinations of parameters influencing the outflow of two phase air-sand stream from machine chamber and core box filling in shooting process
    Badania parametrów wpływających na wypływ dwufazowego strumienia piaskowo-powietrznego z komory nabojowej i wypełnienie rdzennicy w procesie dmuchowym
    Autorzy:
    Fedoryszyn, A.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/356971.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    core production
    core shooting
    core blowing
    rdzennice
    strzelarka
    nadmuchiwarka
    Opis:
    The study investigates the key aspects involved in the flow of the air-sand stream from the machine chamber and in the core box filling in the core shooting and core blowing processes. The prevailing tendency to manufacture thin-walled castings with intricate channel structures has become the major determinant of castings quality and production rates. An important parameter of most core sand used in the shooting processes is the ability to eject from the machine chamber and the core-box filling capability. These properties are the key factors determining the feasibility of manufacturing intricate cores and the process efficiency. The research work outlined in this study focuses on establishing the performance criteria of core sand ejection from the machine chamber and of core box filling and sand compaction. The results given below were obtained for several new-generation core sand types, containing organic and inorganic binders, and designed to be used in hot-box, warm box and warm air processes.
    W publikacji przedstawiono zagadnienia związane z wypływem strumienia piaskowo-powietrznego z komory nabojowej i zapełnianiem rdzennicy metodami dmuchowymi z wykorzystaniem strzelarek i nadmuchiwarek. Tendencja do konstrukcji odlewów o coraz cieńszych ściankach i skomplikowanych kanałach, sprawia, że produkcja wysokiej jakości rdzeni jest nadal czynnikiem determinujacym jakość oraz wydajność produkcji odlewów. Ważnymi właściwościami ogółu mas rdzeniowych stosowanych w procesach dmuchowych jest ewakuacja masy z komory nabojowej maszyny dmuchowej oraz zdolność do zapełniania i zagęszczania masy w rdzennicy. Właściwości te, decydują często o możliwosci wykonania skomplikowanych rdzeni oraz o efektywności procesu technologicznego. Przedstawione badania dotyczą ustalenia kryteriów oceny ewakuacji masy z komory nabojowej oraz zdolność do wypełniania rdzennicy i zagęszczania kilku nowoczesnych mas formierskich, zarówno organicznych jak i nieorganicznych, pochodzących technologii hot box, warm box, warm air.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 903-906
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of core manufacturing process with use of sand, bonded by ecological friendly nonorganic binders
    Autorzy:
    Fedoryszyn, A.
    Dańko, J.
    Dańko, R.
    Asłanowicz, M.
    Fulko, T.
    Ościłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/947570.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanization of foundry proces
    automation of foundry proces
    core blowing machine
    casting core
    inorganic binder
    mechanizacja procesu odlewniczego
    automatyzacja procesu odlewniczego
    maszyna odlewnicza
    rdzeń odlewniczy
    spoiwo nieorganiczne
    Opis:
    Mechanization of the process of core making with the use of inorganic and organic binders is based, almost solely, on core blowing machines. Presently the core blowing machines are equipped with tools and devices that allow for application of different technologies of core making. Cold-box, hot-box and warm-air technologies require that core blowing machines shall be additionally equipped with either core-box pre-heating system or gas purging and neutralization system, or hot air purging systems. Considering the possibility of using varied, the most advantageous technologies of core making, the production of universal core blowing machines equipped with replaceable devices has been undertaken in Poland. The universal core blowing systems allow for mechanization of core making process also with the use of sand, bonded by modern, eco-friendly binder systems. The paper presents selected results-based evaluation of core blowing process showing the scope of conducted design and implementation works.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Application of the Triboelectric Method for the Ongoing Assessment of the Quality of Reclaim in Mechanical Reclaimers
    Autorzy:
    Dańko, R.
    Pietrzak, A.
    Gruszka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2161212.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical reclamation
    reclamation process
    regeneration
    foundry engineering
    fenol resin
    moulding sand
    regeneracja mechaniczna
    proces rekultywacji
    regeneracja
    inżynieria odlewnicza
    żywica fenolowa
    Opis:
    The method of the ongoing assessment of the reclaim quality originating from the mechanical reclamation is described in this paper. In the process, the triboelectric system of measuring amounts of dust in the dedusting part of a reclamation device was applied. Based on the online measurements of the amounts of dust generated in the spent sand-reclamation process and the post-process determinations of the ignition losses and granular structures of the removed dust, the proper work parameters of the experimental reclaimer were selected. The allowable value of the ignition losses as well as the main fraction of the reclaimed matrix being similar to fresh sand was assumed as the main criteria of the positive assessment of the process. Within the presented investigations, a periodically operating device for rotor-mechanical reclamation was developed. The possibility of changing the intensity and time of the reclamation treatment as well as the triboelectric system of the dust-amount measuring were applied in this device. Tests were performed for the spent moulding sand with phenol-resol resin Carbophen 5692 hardened by CO2. This sand represents the moulding sand group with a less harmful influence on the surroundings for which the recovery of the quartz matrix utilising the reclamation requires stricter control of the parameters of the reclamation process and reclaim quality.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 63--70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Hardener on the Emission of Harmful Substances from Moulding Sands with Furan Resin in the Pyrolysis Process
    Autorzy:
    Holtzer, M.
    Kmita, A.
    Żymankowska-Kumon, S.
    Bobrowski, A.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380824.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    furan resin
    mould sand
    emission of gases
    pyrolisis
    BTEX
    PAH
    żywica furanowa
    masa formierska
    emisja gazów
    piroliza
    Opis:
    The furan resin offers advantages such as high intensity, low viscosity, good humidity resistance and is suitable for cast different casting alloys: steel, cast iron and non-ferrous metal casting. For hardening furan resins are used different hardeners (acid catalysts). The acid catalysts have significant effects on the properties of the cured binder (e,g. binding strength and thermal stability) [1 - 3]. Investigations of the gases emission in the test foundry plant were performed according to the original method developed in the Faculty of Foundry Engineering, AGH UST. The analysis is carried out by the gas chromatography method with the application of the flame-ionising detector (FID) (TRACE GC Ultra THERMO SCIENTIFIC).
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 107-111
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth rate and carcass quality of hybrid fatteners depending on the age of slaughter
    Tempo wzrostu i jakość tuszy tuczników hybrydowych w zależności od wieku w dniu uboju
    Autorzy:
    Jankowiak, H.
    Cebulska, A.
    Novotni-Dankó, G.
    Balogh, P.
    Zmudzińska, A,
    Powiązania:
    https://bibliotekanauki.pl/articles/29433576.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    pig
    fattener
    age of slaughter
    fattening
    slaughter value
    growth rate
    carcass quality
    Źródło:
    Acta Scientiarum Polonorum. Zootechnica; 2023, 22, 1; 25-32
    1644-0714
    Pojawia się w:
    Acta Scientiarum Polonorum. Zootechnica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Reclaim Addition on the Emission of PAHs and BTEX from Moulding Sands with Furfuryl Resin with the Average Amount of Furfuryl Alcohol
    Autorzy:
    Holtzer, M.
    Żymankowska-Kumon, S.
    Bobrowski, A.
    Dańko, R.
    Kmita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383161.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environment protection
    foundry
    moulding sands
    BTEX
    PAHs
    reclaim
    ochrona środowiska
    odlewnia
    masa formierska
    odzysk
    Opis:
    In this paper, the results of decomposition of the moulding sand with furan-formaldehyde resin (with middle content of furfuryl alcohol about 50 %) also on a quartz matrix and with additions of a reclaimed material, under industrial conditions, are presented. Investigations of the gases emission in the test foundry plant were performed according to the original method developed in the Faculty of Foundry Engineering, AGH UST. The dependence of the emitted PAHs and BTEX group substances and ignition losses on the reclaim fraction in a moulding sand are of a linear character of a very high correlation coefficient R2. On the bases of the derived equations, it is possible to determine the amount of the emitted hazardous substances from the moulding sand containing the known fraction of the reclaim.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 37-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Reclaim Addition to the Moulding Sand Matrix Obtained in the ALPHASET Technology on the Emission of Gases - Comparison with Moulding Sand with Furfuryl Resin
    Autorzy:
    Holtzer, M.
    Żymankowska-Kumon, S.
    Bobrowski, A.
    Kmita, A.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/379528.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovatory materials
    ecology
    modern technologies
    innowacyjne materiały
    nowoczesne technologie
    ekologia
    Opis:
    This study focuses on the ALPHASET process of mould making (Ester-Cured Alkaline Phenolic No-Bake). The cross – linking of alkaline phenolic resole resin by adding at least one kind of organic esters is the secondary popular system (after the technology of molding sands with furfuryl resins) with the advantages including low odour, virtually no smoke, easy to stripping, good finishing, low veining, minimal erosion, and very good hot strength. The phenolic resoles used in the system are prepared typically by reacting 30-55% formaldehyde solution with less phenol using a strong alkali catalyst, such as sodium hydroxide or potassium hydroxide at the temperatures of below 110oC (pH > 7). After removing parts of water this yields a thermal set phenolic resin solution with solid content 50-70%. In order to significantly increase strength and to improve the moisture and humidity resistance of sand mould, it is necessary to mix a little silence solution addition with resin binder (about 0.1 – 0.3% based on the amount of resin binder).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 121-125
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Harmfulness of Phenolic Resins Hardened by CO2 in an Aspect of Emission of Substances from BTEX and PAH Groups
    Autorzy:
    Holtzer, M.
    Żymankowska-Kumon, S.
    Bobrowski, A.
    Dańko, R.
    Kmita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380226.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environment protection
    phenolic resin
    BTEX
    PAH
    foundry
    ochrona środowiska
    żywica fenolowa
    odlewnia
    Opis:
    Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. If in the initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylobenzene, xylenes), and also polycyclic aromatic hydrocarbons (PAHs) can be formed and released.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 39-43
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elution of mixed moulding sands with the GEOPOL binder and core sands with the phenolic resin
    Autorzy:
    Holtzer, M.
    Żymankowska-Kumon, S.
    Dańko, R.
    Kmita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380919.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environment protection
    phenolic resin
    moulding sand
    core sand
    BTEX
    PAHs
    ochrona środowiska
    żywica fenolowa
    masa formierska
    masa rdzeniowa
    Opis:
    Out of moulding and core sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. Depending on the kind of the applied resin under an influence of a temperature such compounds as for example BTEX group and polycyclic aromatic hydrocarbons (PAHs) can be formed and released. During storing or economic utilization of used sand is possibility of eluting harmful substances into the environment. Therefore at assessing an influence of the used sand on the environment two above elements should be taken into consideration. Only such investigations provide the complete assessment of the given sand harmfulness.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 53-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Harmfulness Assessment of Moulding Sands with a Geopolymer Binder and a New Hardener, in An Aspect of the Emission of Substances from the Btex Group
    Ocena szkodliwości masy formierskiej ze spoiwem geopolimerowym i nowym utwardzaczem w aspekcie emisji związków z grupy BTEX
    Autorzy:
    Bobrowski, A.
    Holtzer, M.
    Żymankowska-Kumon, S.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353731.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sands
    binder
    geopolymers
    gasses emission
    BTEX
    piaski formierskie
    spoiwo
    geopolimery
    emisja gazów
    Opis:
    The harmfulness assessment of moulding sands with a geopolymer binder and a new hardener, in an aspect of the emission of substances from the BTEX group, was performed. Within the expedience project the new series of hardeners for the inorganic GEOPOL binder was developed. Before the introduction of the new system of moulding sands it was necessary to estimate their influence on the environment. To this aim the gasses emission from moulding sands subjected to the influence of liquid cast iron was tested with regard to the content of the gases from the BTEX group (benzene, toluene, ethylbenzene and xylenes). For the comparison the analogous investigations of the up to now applied moulding sands with the geopolymer binder, were performed. It was found that both systems of moulding sands binding emit similar amounts of gases, as well as similar amounts of substances from the BTEX group. Moulding sands with the GEOPOL binder are much more environmentally friendly than moulding sands with organic binders. The content of the BTEX group substances in gases emitted from moulding sands with the GEOPOL binder was approximately 10-times lower than in case of the moulding sands with organic binders.
    W ramach projektu celowego opracowano nową serię utwardzaczy dla spoiwa nieorganicznego Geopol. Przed wprowadzeniem nowego systemu mas formierskich konieczne było określenie ich wpływu na środowisko. W tym celu przeprowadzono badania emisji gazów z mas poddanych oddziaływaniu ciekłego żeliwa pod kątem zawartości w tych gazach związków z grupy BTEX (benzen, toluen, etylobenzen i ksyleny). Dla porównania przeprowadzono analogiczne badania dotychczas stosowanego systemu wiązania masy ze spoiwem geopolimerowym. Stwierdzono, ze obydwa systemy wiązania mas formierskich emitują zbliżone ilości gazów, jak również związków z grupy BTEX. W porównaniu do mas ze spoiwami organicznymi można uznać, że masy ze spoiwem GEOPOL są wysoce przyjazne dla środowiska. Zawartość związków z grupy BTEX w gazach emitowanych z mas ze spoiwem GEOPOL była około 10-krotnie mniejsza niż w przypadku mas ze spoiwami organicznymi.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 341-344
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the Reclamation Ability of Moulding Sands with the Modified Binding System and the Reclaim Quality Assessment
    Autorzy:
    Bobrowski, A.
    Dańko, R.
    Holtzer, M.
    Drożyński, D.
    Skrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380847.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    geopolymer binder
    reclaim
    hardeners
    reclaim quality
    masa formierska
    spoiwo
    odzysk
    utwardzacze
    jakość odzysku
    Opis:
    The investigation results of the reclaiming ability of a spent moulding sand with the geopolymer Geopol developed by the SAND TEAM Company as well as a moulding sand with a modified binding system based on the geopolymer binder and new hardener offered by the KRATOS Company, are presented in the paper. The basic aim of investigations was the comparison of the reclaiming ability of spent moulding sands with additions of hardeners supplied by various producers. All hardeners were of the same hardening rate. Amounts of the geopolymer binder and of the hardener was the same for both tested moulding sands.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of a liquid metal temperature on a thermal decomposition of a phenolic resin
    Autorzy:
    Holtzer, M.
    Bobrowski, A.
    Dańko, R.
    Żymankowska-Kumon, S.
    Kolczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382247.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environment protection
    phenolic resin
    BTEX compounds
    alluminium
    foundry
    ochrona środowiska
    żywica fenolowa
    związki typu BTEX
    aluminium
    odlewnictwo
    Opis:
    Due to the presence of harmful substances in resins those mould sands may be hazardous to the natural environment and workers. The general assessment of harmfulness of sands used for molds and cores encompasses 2 basic points: emission of hazardous substances during processes of preparing sands, pouring mold with liquid metals (high temperatures), cooling and shaking-out; possibility of washing out hazardous substances from used sands to the environment, during storage or economic use outside foundries. We present the results of research on the emission of BTEX compounds from mould sands with phenolic resins during pouring liquid metal of different temperature (cast iron and Al alloy). The research was conducted according to the original method prepared by the authors, which has been used for years in cooperation with various foundries (Poland, abroad).
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 35-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Harmfulness of Moulding Sands with Alkyd Resin Subjected to the High Temperature Influence
    Autorzy:
    Holtzer, M.
    Dańko, R.
    Żymankowska-Kumon, S.
    Kubecki, M.
    Bobrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354778.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    binding
    BTEX
    thermal analysis
    GC/MS
    Opis:
    Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. These resins in their initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin, under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAHs) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX and PAHs group. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 500 – 1 300°C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. The qualitative and quantitative analyses of compounds were performed by means of the gas chromatography coupled with the mass spectrometry (GC/MS).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2171-2176
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the compounds from the BTEX group, emitted during thermal decomposition of alkyd resin
    Autorzy:
    Kubecki, M.
    Holtzer, M.
    Bobrowski, A.
    Dańko, R.
    Grabowska, B.
    Żymankowska-Kumon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/380216.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    wiązanie
    BTEX
    analiza termiczna
    GC-MS
    moulding sand
    binding
    thermal analysis
    Opis:
    Suitability of the given binding agent for the moulding sands preparation depends on the one hand on the estimation of technological properties of the sand and the mould made of it and the obtained casting quality and on the other hand on the assessment of this sand influence on the natural and working environment. Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. If in the initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin (phenol-formaldehyde, urea, furfuryl, urea-furfuryl, alkyd) under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAH) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX group. An emission of these components constitutes one of the basic criteria of the harmfulness assessment of binders applied for moulding and core sands. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 5000C - 13000C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. Within investigations the minimal amount of adsorbent necessary for the adsorption of compounds released during the decomposition of the resin sample of a mass app. 15 mg was selected. Also the minimal amount of solvent needed for the desorption of compounds adsorbed in the column with adsorbent was found. The temperature range, in which the maximal amounts of benzene, toluene, ethylobenzene and xylenes are released from the resin, was defined. The qualitative and quantitative analyses of compounds from the BTEX group were performed by means of the gas chromatography combined with the mass spectrometry (GC/MS).
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza związków z grupy BTEX powstających podczas termicznego rozkładu żywicy alkidowej
    Analysis of the compounds from the BTEX group emitted during thermal decomposition of alkyd resin
    Autorzy:
    Kubecki, M.
    Holtzer, M.
    Bobrowski, A.
    Dańko, R.
    Grabowska, B.
    Żymankowska-Kumon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381040.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    żywica syntetyczna
    związek BTEX
    rozkład termiczny
    chromatografia gazowa
    spektrometria masowa
    moulding sand
    synthetic resin
    BTEX compounds
    thermal decomposition
    gas chromatography
    mass spectrometry
    Opis:
    Przydatność danego spoiwa do sporządzania mas formierskich obejmuje z jednej strony ocenę właściwości technologicznych samej masy i wykonanej z niej formy i jakości otrzymanego odlewu, a z drugiej strony ocenę wpływu tej masy na środowisko naturalne i środowisko pracy. Z pośród mas stosowanych w przemyśle odlewniczym na szczególną uwagę zasługują masy ze spoiwami organicznymi. Spoiwa te oparte są na żywicach syntetycznych, które z jednej strony zapewniają uzyskanie przez masę odpowiednich właściwości technologicznych i otrzymanie dobrych odlewów, ale z drugiej negatywnie oddziałują na środowisko. O ile w stanie wyjściowym żywice te tylko w niewielkim stopniu stanowią zagrożenie zarówno dla ludzi jak i środowiska, to pod wpływem temperatury generują bardzo szkodliwe produkty, będące wynikiem ich termicznego rozkładu. W zależności od rodzaju stosowanej żywicy (fenolowo-formaldehydowej, mocznikowej, furfurylowej, furfurylowo–mocznikowej, alkidowej) pod wpływem temperatury mogą tworzyć się i uwalniać takie związki jak: alkohol furfurylowy, formaldehyd, fenol, związki z grupy BTEX (benzen, toluen, etylobenzen, ksyleny), a także wielopierścieniowe węglowodory aromatyczne (WWA). [...]
    Suitability of the given binding agent for the moulding sands preparation depends on the one hand on the estimation of technological properties of the sand and the mould made of it and the obtained casting quality and on the other hand on the assessment of this sand influence on the natural and working environment. Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. If in the initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin (phenol-formaldehyde, urea, furfuryl, urea–furfuryl, alkyd) under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAH) can be formed and released. [...]
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 119-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dictyonema black shale and Triassic sandstones as potential sources of uranium
    Autorzy:
    Kiegiel, K.
    Zakrzewska-Kołtuniewicz, G.
    Gajda, D.
    Miśkiewicz, A.
    Abramowska, A.
    Biełuszka, P.
    Danko, B.
    Chajduk, E.
    Wołkowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147500.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium ores
    leaching
    extraction
    ion-exchange chromatography
    precipitation
    Opis:
    The main objective of the present study was an assessment of the possibility of uranium recovery from domestic resources in Poland. In the fi rst stage uranium was leached from the ground uranium ore by using acidic (sulfuric acid or hydrochloric acid) or alkaline (carbonate) solutions. The leaching efficiencies of uranium were dependent on the type of ore and it reached 81% for Dictyonemic shales and almost 100% for sandstones. The novel leaching routes, with the application of the helical membrane contactor equipped with rotating part were tested. The obtained postleaching solutions were concentrated and purifi ed using solvent extraction or ion exchange chromatography. New methods of solvent extraction, as well as hybrid processes for separation and purifi cation of the product, were studied. Extraction with the use of membrane capillary contactors that has many advantages above conventional methods was also proposed as an alternative purification method. The fi nal product U3O8 could be obtained by the precipitation of ‘yellow cake’, followed by calcination step. The results of precipitation of ammonium diuranate and uranium peroxide from diluted uranium solution were presented.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 515-522
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutron emission parameters from the collapse of the condensed Z-pinch
    Autorzy:
    Anan'ev, S. S.
    Bakshaev, Y. L.
    Bryzgunov, V. A.
    Chernenko, A. S.
    Dan'ko, S. A.
    Kazakov, E. D.
    Klír, D.
    Korolev, V. D.
    Smirnova, E. A.
    Ustroev, G. I.
    Vikhrev, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146662.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutrons
    energy distribution
    fast Z-pinch
    Opis:
    The parameters of neutron emission from the neck of the condensed Z-pinch, were measured at an S-300 installation (2 MA, 100 ns). Profiled loads with central parts made from microporous deuterated polyethylene (with a density of 100 mg/cm3) were used in the experiments. Neutron emission parameters were measured by the time-of-flight (TOF) method. Neutrons were registered using four flight bases with 10 scintillation detectors which were placed at two axial and two radial directions. It was found that the mean neutron energy, determined by the TOF method, turned out to be anisotropic. The average energy of neutrons emitted along the axis towards the cathode, was shifted to higher energy (2.6-2.8 MeV) and the average energy of neutrons emitted towards the anode, was shifted to lower energy (2.1-2.3 MeV) compared to the d-d reaction neutron energy 2.45 MeV. The average energy of neutrons, emitted in two opposite radial directions, was close to 2.45 MeV. The half-width of the energy distributions reconstructed for all directions was 400-500 keV. The analysis of the experimental results demonstrated that the found phenomena could be explained by a slowly decaying high energy tail in the energy distribution of colliding deuterons. The maximal neutron yield was of 6 x 109.
    Źródło:
    Nukleonika; 2012, 57, 3; 333-336
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilizing of Z-pinch and Plasma Focus discharges due to thick wires
    Autorzy:
    Kubeš, P.
    Kravárik, J.
    Paduch, M.
    Tomaszewski, K.
    Scholz, M.
    Karpinski, L.
    Szydlowski, A.
    Bakshaev, Y.
    Blinov, P.
    Chernenko, A. S.
    Gordeev, E. M.
    Dan’ko, S. A.
    Korolev, V. D.
    Shashkov, A.
    Tumanov, V. I.
    Romanova, V.
    Klír, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146991.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    X-ray source
    XUV spectroscopy
    Z-pinch
    Opis:
    This paper presents the results of the diagnostics observing the impact of the plasma sheath imploded in megaamper Z-pinch or plasma focus devices onto the Al or C wires of 30-300 mi m in diameter fixed in the center axis. The discharges were operated with a maximum current of 1.5-3 MA at two devices, PF 1000 at IPFLM in Warsaw, and Stand 300 at RRC Kurchatov Institute in Moscow. At the plasma impact the 10-50 ns XUV pulse was emitted in K-shell lines from the ring or helical-like forms on the surface of the wire corona. The scenario of the production of the non-equilibrium intensities of the C and Al H-like and He-like lines is discussed considering fast transformation of magnetic field, electron beams acceleration, total ionization of the ions and fast recombination in dense and magnetized wire corona.
    Źródło:
    Nukleonika; 2001, 46, 1; 5-7
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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