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    Wyświetlanie 1-15 z 15
    Tytuł:
    EBSD Strain Analysis of CuZn10 Cast Alloy During Cavitational Wear
    Autorzy:
    Jasionowski, R.
    Zasada, D.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/380062.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EBSD method
    cavitation
    cavitational erosion
    strain analysis
    metoda EBSD
    kawitacja
    erozja kawitacyjna
    analiza odkształceń
    Opis:
    Microstreams of liquid formed during the implosion of cavitation bubbles and the effects of pressure waves coming from disappearing bubbles are the main causes of damage of the washed surface, leading to loss of material (the cavitation erosion). Repeated cavitation implosions cause non-uniform stress state resulting in the strengthening of the surface layer, change of micro-geometry and surface cracks leading to detachment of the material particles. Course of cavitation erosion process depends on the effects of plastic deformation at the beginning of the destruction. The aim of this study was analysis of plastic deformation by EBSD method of CuZn10 cast alloy at the beginning of the cavitation destruction process.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 51-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Destruction Mechanism of Z10400 Zn-based Alloy Subjected to Cavitational Erosion
    Autorzy:
    Jasionowski, R.
    Zasada, D.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/380734.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc alloy
    cavitation wear
    Electron Backscattered Diffraction (EBSD)
    stop cynku
    zużycie kawitacyjne
    dyfrakcja elektronów wstecznie rozproszonych
    Opis:
    Z10400 zinc-based alloy has a very good casting properties and high resistance to corrosion. These two advantages make that Z10400 zinc-based alloy is commonly used for cathodic protection of hulls of ships. Cathodic anodes made of Z10400 zinc-based alloy in the propeller and flap rudder areas are also additionally exposed to the cavitation erosion. The aim of this work was to determine the cavitation erosion resistance of Z10400 zinc-based alloy, which is applied as protectors in cathodic protection of hulls of ships. The examination of cavitational erosion was carried out on a jet-impact measuring device. Study of the mechanism of the destruction of Z10400 alloy based on analysis was performed with scanning electron microscope Quanta 3d FEG and electron back scattered diffraction (EBSD) method.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 48-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EBSD Strain Analysis of CuZn10 Alloy in As-cast State and After Plastic Working and Annealing During Cavitational Wear
    Autorzy:
    Jasionowski, R.
    Zasada, D.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/381392.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Electron Backscattered Diffraction (EBSD)
    cavitation wear
    strain analysis
    dyfrakcja elektronów wstecznie rozproszonych
    zużycie kawitacyjne
    analiza odkształceń
    Opis:
    Electron backscatter diffraction (EBSD) system in conjunction with scanning electron microscope (SEM) allows performing full material characterization which include analysis of individual grain orientations, crystal orientation, global and local texture, phase identification and distribution or microstrain mapping. EBSD technique may be also applied for assessing lattice strain introduced during local plastic deformation due to its close relationship with development of dislocation substructure. The aim of this study was analysis of surface deformation by EBSD method of CuZn10 alloy in as-cast state and after plastic working and annealing, with different grain size at the beginning of the cavitation destruction process. The local changes of plastic deformation inside each grain were expressed by Grain Orientation Spread (GOS) and Kernel Average Misorientation (KAM) parameters.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 53-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Destruction Mechanism of ZnAl4 as Cast Alloy Subjected to Cavitational Erosion Using Different Laboratory Stands
    Autorzy:
    Jasionowski, R.
    Polkowski, W.
    Zasada, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381763.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cavitation
    cavitation wear
    alloy ZnAl
    cast alloy
    destruction mechanism
    kawitacja
    zużycie
    stop ZnAl
    stop żeliwa
    destrukcja
    Opis:
    The main reason of a cavitational destruction is the mechanical action of cavitation pulses onto the material’s surface. The course of cavitation destruction process is very complex and depends on the physicochemical and structural features of a material. A resistance to cavitation destruction of the material increases with the increase of its mechanical strength, fatigue resistance as well as hardness. Nevertheless, the effect of structural features on the material’s cavitational resistance has been not fully clarified. In the present paper, the cavitation destruction of ZnAl4 as cast alloy was investigated on three laboratory stands: vibration, jet-impact and flow stands. The destruction mechanism of ZnAl4 as cast alloy subjected to cavitational erosion using various laboratory stands is shown in the present paper.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Crystalographic Texture on Cavitation Wear Resistance of As-Cast CuZn10 Alloy
    Autorzy:
    Jasionowski, R.
    Polkowski, W.
    Zasada, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/355595.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    texture
    cavitation
    cavitation erosion
    electron backscatter diffraction
    EBSD
    CuZn10 alloy
    Opis:
    Analysis of a crystallographic texture (a preferred orientation) effect on cavitation wear resistance of the as-cast CuZn10 alloy, has been conducted in the present paper. The experiment was conducted on the CuZn10 alloy samples with <101>//ND or <111>//ND preferred orientations (where the ND denotes direction that is perpendicular to the exposed surface). The cavitation resistance examinations have been carried out on three different laboratory stands (namely, vibration, jet-impact and flow stands) that are characterized by a various intensity and a way of cavitation’s excitement. Obtained results point towards a higher cavitation resistance of the CuZn10 alloy with the <111>//ND preferred orientation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 935-940
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyniki badań nad nową odmianą kostrzewy trzcinowej
    Rezultaty ispytanijj novogo sorta ovsjanicy trostnikovidnojj
    Results of tests of a new tall fescue variety
    Autorzy:
    Goral, S.
    Sybilska, A.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/795064.pdf
    Data publikacji:
    1988
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    Испытания проведенные в Радзикове с сортом Рахеля показали возможность достижения урожая 13 т сухого вещества с гектара. Рассматриваемый сорт характеризуется очень ранним началом роста и равномерным распределением урожаев.
    The tests carried out at Radzików on the Rahela variety have proved the possibility of getting the cut yield reaching 13 t of dry matter from hectare. This variety is characterized by a very early growth start and uniform distribution of yields.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1988, 366
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of aluminum content on the microstructure and cavitation wear of feal intermetallic alloys
    Autorzy:
    Jasionowski, R.
    Zasada, D.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/386821.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    intermetallic alloys
    cavitation
    cavitation wear
    Electron Backscattered Diffraction (EBSD)
    stopy międzymetaliczne
    kawitacja
    EBSD
    Opis:
    Intermetallic-based alloys (so called intermetallics) of the Fe-Al binary system are modern construction materials, which in re- cent decades have found application in many branches of the power, chemical and automotive industries. High resistance of FeAl based alloys to cavitational erosion results first of all from their high hardness in the as-cast state, large compressive stresses in the material, as well as homogeneous structure. In the present paper, the effect of aluminum content on the microstructure, texture and strain imple- mented upon cavitation wear of FeAl intermetallic alloys, have been analyzed by field emission gun scanning electron microscopy (FEG SEM) and electron backscatter diffraction (EBSD) analysis. Obtained results of structural characterization indicates that with increasing aluminium content effects of orientation randomization (weakening of <100>//ND casting texture), grain refinement and rising of mechani- cal strenght (and so cavitational resistance) take place.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 1; 49-52
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by LENS Technique
    Autorzy:
    Łazińska, M.
    Durejko, T.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356020.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FeAl intermetallics
    nano-Al2O3 addition
    Laser Engineered Net Shaping
    Opis:
    Results of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl2O3 (n-Al2O3) particles by the LENS method and a subsequent characterization of the as received materials’ structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool. The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al2O3 content. Although, indirect methods revealed influence of n-Al2O3 addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al2O3 significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al2O3 causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al2O3 addition. Four times lower increase of samples mass was noticed for sample with the n-Al2O3 addition as compared to the pure Fe40Al intermetallic alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1703-1712
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of various imaging modes in scanning electron microscopy during evaluation of selected Si/refractory sessile drop couples after wettability tests at ultra-high temperature
    Autorzy:
    Polkowska, A.
    Warmuzek, M.
    Kalarus, J.
    Polkowski, W.
    Sobczak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/391383.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    scanning electron microscopy
    sessile drop method
    silicon
    refractories
    in-lens detectors
    Opis:
    In this work, FEI SciosTM field emission gun scanning electron microscope (FEG SEM) equipped with a unique combination of analytical and imaging detectors was utilized to examine structure and chemistry of selected Si/ refractory couples. The couples were obtained in wettability tests performed by the sessile drop method coupled with contact heating of a refractory substrate (h-BN, SiC) at ultra-high temperature (up to 1750°C). The SEM observations were carried out on top-views of the couples, in order to evaluate surface and interfacial phenomena in Si/h-BN and Si/SiC systems. A full range of available detectors (e.g. classical Everhart-Thornley detector (ETD) or advanced in-lens detectors) working under various operation modes (secondary electrons (SE), backscattered electrons (BSE), a mixed mode), were used upon analyses in order to reveal specific features of obtained structures.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 337-344
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioimpedance vector pattern in women with breast cancer detected by bioelectric impedance vector analysis. Preliminary observations
    Autorzy:
    Malecka-Massalska, T.
    Chara, K.
    Smolen, A.
    Kurylcio, A.
    Polkowski, W.
    Lupa-Zatwarnicka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/50874.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Twice malignant transformation of hypertrophic lichen planus
    Autorzy:
    Krasowska, D.
    Kozlowicz, K.
    Kowal, M.
    Kurylcio, A.
    Budzynska-Wlodarczyk, J.
    Polkowski, W.
    Chodorowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/50185.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Awareness of gastrointestinal tract malignancies among the population of Lublin province (Eastern Poland) - a cross-sectional study
    Autorzy:
    Barbecka, M.
    Kolasińska-Bzoma, M.
    Kolasińska-Gliwa, E.
    Polkowski, W.
    Offerhaus, G.J.A.
    Maciejewski, R.
    Sitarz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085871.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    awareness of gastrointestinal malignancies
    cancer prevention
    primary health care
    prophylaxis
    risk factors
    Opis:
    Introduction. Currently, malignancies are the most severe medical problems worldwide. Numerous, already known risk factors in carcinogenesis could be potentially avoided. Some cancer risk factors have been recognized and have become the targets of primary prophylaxis. Objective. The aim of the study was to ascertain the state of knowledge about risk factors, primary prevention and early detection of malignancies of gastrointestinal tract (GIT) in the urban and rural population of the Lublin province in Eastern Poland. Materialas and method. The study was cross-sectional. The originally designed questionnaire was applied to the group of 1,352 patients, representatives of both the rural and urban environments of the Lublin province during random appointments with their general practitioner (GP). Results. The study showed low awareness of the issues connected with GIT malignancies within the studied group. The problem was particulary apparent in the rural population. Conclusions. In order to raise general awareness of cancer, different means should be applied in urban and rural populations. GPs and the media were found to have the leading rols in the promotion of primary prevention.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 3; 469-475
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wetting behavior of Si-13.5B alloy on polycrystalline h-BN-based substrates
    Autorzy:
    Polkowski, W.
    Sobczak, N.
    Nowak, R.
    Kudyba, A.
    Bruzda, G.
    Polkowska, A.
    Homa, M.
    Turalska, P.
    Shuleshova, O.
    Kaban, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/391820.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    silicon-boron alloys
    hexagonal boron nitride
    wettability
    interfaces
    AMADEUS Project
    Opis:
    In this work, for the first time the results of an experimental evaluation of the high temperature behavior of molten Si-B alloy in contact with refractory materials at temperatures up to 1750°C, under static argon atmosphere (p = 850– 900 mbar), is shown. The material investigated, having a nominal chemical composition of Si-13.5B (at. %), was fabricated by using the crucible-less electric arc-melting process assisted by the levitation drop method. The wettability of the molten alloy in contact with commercial hexagonal boron nitride (h-BN) substrates was evaluated by means of especially developed sessile drop technique combined with a contact heating procedure. It was found that both couples show a lack of wettability in the whole tested temperature range (the measured contact angle was θ > 130°). The more stable behavior in contact with molten Si-13.B alloy, evidenced by higher θ values and a lack of drop vibration during the high temperature exposition, was observed for the h-BN based composite substrate.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 321-326
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Altered tissue electrical properties in women with breast cancer – Preliminary observations.
    Autorzy:
    Malecka-Massalska, T.
    Chara, K.
    Golebiowski, P.
    Wladysiuk, M.
    Smolen, A.
    Kurylcio, A.
    Zuchora, B.
    Zubrzycki, J.
    Orlowska-Kowalik, G.
    Lupa-Zatwarnicka, K.
    Polkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/51083.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and objectives: In the United States, breast cancer (BC) is the most common non-skin cancer. In Poland, it is estimated that the number of new breast cancer cases affects about 13,500 women each year. There are many methods for nutritional status assessment. One of them is bioimpedance analysis (BIA). Direct bioimpedance measures (resistance, reactance, phase angle (PA)) determined by bioelectrical impedance analysis (BIA) detectf changes in tissue electrical properties. The study was conducted to investigate whether there are any tissue electrical differences in patients with breast cancer. Materials and methods: The direct bioimpedance measures determined by bioelectrical impedance analysis (BIA) were performed on 34 patients with BC and 34 healthy volunteers. The measurements were made with ImpediMed bioimpedance analysis SFB7 BioImp v1.55 (Pinkenba Qld 4008, Australia). Results: Reactance and resistance at 50 kHz was found to be significantly greater in patients with BC than in the control group (53.59° ± 1.53 vs. 47.26° ± 1.25, respectively, p=0.0031; 603.24° ± 15.38 ohm vs. 515.87° ± 11.48 ohm, respectively, p=0.00004). Conclusion: Pre-surgical patients diagnosed with BC have altered tissue electrical properties. Further observations of a larger patient group would be valuable to calculate survival, validate the prognostic significance of PA, and monitor nutritional and therapeutic interventions in this patient population.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The integration of BI, ERP and CRM systems
    Integracja systemów BI, ERP i CRM
    Autorzy:
    Pólkowski, Z.
    Constantin, D.
    Raducu, A. I.
    Blidaru, E. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/131387.pdf
    Data publikacji:
    2016
    Wydawca:
    Uczelnia Jana Wyżykowskiego
    Tematy:
    BI
    Business Intelligence
    ERP
    enterprise resource planning
    CRM
    Customer Relationship Management
    IT integration
    Enterprise Resource Planning
    zarządzanie relacjami z klientami
    integracja IT
    Opis:
    In the sphere of business there is a lot of confusion among Business Intelligence (BI), Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) systems with the major one being that most people think BI is the same as ERP, whereas BI is a more evolved technology which, even though it relies on ERP, is also based on back office data. Moreover, not everyone is aware that most CRM functionality can be embedded in ERP and BI solutions. To fully use the potential of the BI and CRM systems, they should be integrated into a central system supporting the management of the organisation which is usually a key element of companies internal IT infrastructure. In this paper the authors are committed to describing and explaining the major differences existing among BI, ERP and CRM systems in various aspects. Also, the authors aim to explain the advantages and disadvantages of those solutions and the future trends. The methods used in this study are analysis, observation and the study of literature.
    W sferze gospodarczej występują nieporozumienia dotyczące Business Intelligence (BI), Enterprise Resource Planning (ERP) oraz Customer Relationship Management (CRM). Większość ludzi sądzi, że rozwiązania BI są podobne do ERP. Okazuje się, że BI jest bardziej rozwiniętą technologią, która wykorzystuje ERP. Podobne nieporozumienia dotyczą systemów CRM. Nie każdy zdaje sobie sprawę, że większość funkcjonalności CRM może być zaimplementowane w ERP i BI. Aby w pełni wykorzystać potencjał systemów BI i CRM, powinny one zostać włączone do centralnego systemu wspomagającego zarządzanie organizacją, który w przedsiębiorstwach jest zazwyczaj kluczowym elementem wewnętrznej infrastruktury IT. W niniejszym artykule autorzy scharakteryzowali i wyjaśnili istotne różnice istniejące między systemami CRM, ERP i BI w różnych aspektach. Ponadto, zostały opisane zalety i wady tych rozwiązań i pojawiające się trendy w tym zakresie . Metody zastosowane w tym badaniu to analizy, obserwacje i badania literaturowe.
    Źródło:
    Zeszyty Naukowe Uczelni Jana Wyżykowskiego. Studia z Nauk Technicznych; 2016, 5; 49-63
    2543-6740
    Pojawia się w:
    Zeszyty Naukowe Uczelni Jana Wyżykowskiego. Studia z Nauk Technicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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