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    Wyświetlanie 1-12 z 12
    Tytuł:
    Badania procesu ciecia zdzbel zboz
    Autorzy:
    Zuk, D
    Powiązania:
    https://bibliotekanauki.pl/articles/801645.pdf
    Data publikacji:
    1994
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    zjawiska fizyczne
    maszyny rolnicze
    zespol tnacy
    zboza
    ciecie
    zdzbla
    Opis:
    W pracy przedstawiono syntetyczny przegląd dotychczasowych badań procesu cięcia. Opisano sposób określenia i oceny zjawisk mechanicznych zachodzących w źdźble w procesie cięcia.
    On the basis of the carried out studies it was found that during the grain stalk cutting process it was possible to separate four physically noticeable and theoretically justified phases which are as follows: 1) stalk elastic strain, 2) stalk plastic strain (crushing), 3) stalk tissue division, 4) the cut down stalk influence on the cutting element.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1994, 415; 161-166
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the type of aging after supersaturating on hardness and AW-7020 stop structure
    Autorzy:
    Abramczyk, N.
    Żuk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/247196.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    AW-7020 alloy
    natural aging
    artificial aging
    saturation
    hardness
    ductility
    internal structure
    Opis:
    Effect of the type of aging after supersaturating on hardness and AW-7020 stop structure
    Źródło:
    Journal of KONES; 2018, 25, 3; 9-16
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of parametric structure modelling in the design process
    Autorzy:
    Żuk, D.
    Abramczyk, N.
    Lesnau, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/243506.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    parameterization
    control parameters
    modelling
    davit
    automation
    Opis:
    Automation of processes related to design and manufacturing is one of the essential goals of most manufacturing companies. The use of modern computer-aided design systems CAD allows partial automation of such processes. The parametric model can be built in some CAD systems. In the parametric model, selected dimensions are treated as control parameters. By changing the values of these parameters, we can control the remaining geometrical dimensions of the model. These dimensions can be associated with linear control parameters using mathematical relationships. Parameterization allows you to associate a geometric model with a mathematical model and allows you to automatically make changes to all elements associated with the currently modified parameter. When working on a non-parameterized model, the changes in the modelled object must be applied separately for each part and subassembly of which it is composed. In a parametric model, changing one parameter entails changes in other parameters dependent on it. Parameterization of the model allows its use for further modification of the designed structure related to customer requirements, even for that very complex, as well as accelerating the design process itself. The article presents a three-dimensional geometric model of a boat davit created with the use of the Siemens NX 9.0 software. In the work, the geometry of the crane model was parameterized for the assumed values of its height and reach. As a result of parametric modelling, the values of the individual geometric dimensions of the device’s structure elements and their mass were obtained. It was justified that thanks to the use of parameterized models, the time of design and construction processes can be significantly reduced, which makes the process more efficient.
    Źródło:
    Journal of KONES; 2018, 25, 3; 541-548
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the type of layered distribution of rubber recyclate as an additive modifying the mechanical properties of epoxy-glass composites
    Autorzy:
    Abramczyk, N.
    Żuk, D.
    Panasiuk, K.
    Dyl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200603.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    epoxy-glass composites
    recycling
    rubber recyclate
    static tensile test
    modification
    kompozyty epoksydowo-szklane
    recykling
    recyklat gumowy
    statyczna próba rozciągania
    modyfikacja
    Opis:
    Purpose: The research aimed to determine the effect of adding rubber recyclate as a sandwich layer of sandwich composites made based on glass mat and epoxy resin EPO 652. Design/methodology/approach: Four types of research materials with a 5% addition of rubber recyclate and with different ways of layer distribution in the composite and one variant without the addition of recyclate as a comparative material were produced for the study. Samples made of the materials in question were subjected to a static tensile test to determine the changes in strength parameters caused by the addition and distribution of the modifier. Findings: Four types of research materials with a 5% addition of rubber recyclate and with different ways of layer distribution in the composite and one variant without the addition of recyclate as a comparative material were produced for the study. Samples made of the materials in question were subjected to a static tensile test to determine the changes in strength parameters caused by the addition and distribution of the modifier. Research limitations/implications: As a result of the conducted research, the fundamental influence of the recyclate additive and its distribution method on the changes in parameters recorded during the static tensile test was clearly found. Practical implications: The analyses carried out enable the selection of the optimal material variant depending on the intended application. Originality/value: The analysis of the preliminary results obtained during the research showed that epoxy-glass composites based on EPO 652 resin with the addition of rubber recyclate in the form of two and three sandwich layers have better strength parameters than the composite with random addition of recyclate to the matrix. The material characterized by the highest plasticity is a variant with two layers of recyclate spacers. At the same time, it can be stated that the highest values of relative deformation ε obtained a composite with one sandwich layer of rubber recyclate.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 118, 2; 61--66
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Composition of Native Oxide Layers on $In^{+}$ Implanted and Thermally Annealed GaAs
    Autorzy:
    Kulik, M.
    Kołodyńska, D.
    Żuk, J.
    Komarov, F.
    Filiks, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400486.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uj
    79.60.-i
    82.80.Yc
    Opis:
    Semi-insulating GaAs wafers have been implanted with 250 keV In^{+} ions at a fluence of $3 \times 10^{16} cm^{-2}$. The samples prepared in this way were subsequently annealed at a temperature of 600°C or 800°C for 2 h. Thicknesses of the native oxide layers on implanted GaAs after samples storage in air were evaluated using the Rutherford backscattering spectrometry with the nuclear reaction $O^{16}(α,α)O^{16}$ method. The chemical composition of native oxide layers on $In^{+}$ implanted and annealed GaAs has been studied using X-ray photoelectron spectroscopy. $As_{2}O_{3}$, $As_{2}O_{5}$, $Ga_{2}O_{3}$, $GaAs$, $InAs$ and $InAsO_4$ compounds were detected in these layers.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 943-947
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stan obecny i strategia rozwoju branży węgla brunatnego w I połowie XXI wieku w Polsce
    Present status and development strategy of brown coal industry in the first half of XXI century
    Autorzy:
    Kasztelewicz, Z.
    Kaczorowski, J.
    Mazurek, S.
    Orlikowski, D.
    Żuk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/349344.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    górnictwo odkrywkowe
    węgiel brunatny
    energetyka
    bezpieczeństwo energetyczne
    opencast mining
    brown coal
    power industry
    energetic safety
    Opis:
    Artykuł przedstawia stan obecny kopalń węgla brunatnego, a w tym osiągnięte podstawowe parametry produkcyjne od początku działalności do 2008 roku. Podstawowa część artykułu to założenia poszczególnych kopalń odnośnie utrzymania i rozwoju zdolności produkcyjnych w zagłębiach czynnych i perspektywicznych. Przedstawione są możliwe wielkości wydobycia węgla, mocy elektrowni i produkcji energii elektrycznej w czynnych i nowych elektrowniach oraz przetwórstwa chemicznego węgla brunatnego na paliwa płynne i gazowe.
    The article introduces the present state of brown coal mines, including fundamental production parameters from the beginnings of operation till year 2008. The main part of the article are assumptions concerning individual mines about sustaining and developing production capacity both in existing and perspective basins. There are also possible quantities of coal output, quantities of power and production of electric energy in active and new power plants as well as chemical processing of brown coal to liquid and gas fuels shown in the paper.
    Źródło:
    Górnictwo i Geoinżynieria; 2009, 33, 2; 213-231
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diode Laser Surface Alloying of Armor Steel with Tungsten Carbide
    Autorzy:
    Janicki, D.
    Górka, J.
    Kwaśny, W.
    Gołombek, K.
    Kondracki, M.
    Żuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351086.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser surface alloying
    diode laser
    armor steel
    metal matrix composite
    tungsten carbide
    Opis:
    Metal matrix composite (MMC) surface layers reinforced by WC were fabricated on armor steel ARMOX 500T plates via a laser surface alloying process. The microstructure of the layers was assessed by scanning electron microscopy and X-ray diffraction. The surface layers having the WC fraction up to 71 vol% and an average hardness of 1300 HV were produced. The thickness of these layers was up to 650 μm. The addition of a titanium powder in the molten pool increased the wettability of WC particles by the liquid metal in the molten pool increasing the WC fraction. Additionally, the presence of titanium resulted in the precipitation of the (Ti,W)C phase, which significantly reduced the fraction of W-rich complex carbides and improved a structural integrity of the layers.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 473-481
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of primary care physicians and nurses in convincing patients to participate in a colorectal cancer screening program in a Polish coordinated care organization: a questionnaire-based study
    Autorzy:
    Guzek, M.
    Szafraniec-Burylo, S.
    Wyrebiak, A.
    Kowalczyk, D.
    Bukato, G.
    Prusaczyk, A.
    Zuk, P.
    Czech, M.
    Kurpas, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1773.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Opis:
    Background: Medical assistants/care coordinators play a crucial role in the coordinated care system. The tasks of nurses and some qualified supporting staff have been extended to include this role along with the implementation of the pilot program POZ Plus in Polish primary healthcare. A personalized approach to the patient is especially important during the implementation of large-scale prevention programs. Aim of the study: To assess who has the greatest influence on the patient’s decision to undergo screening colonoscopy and outline the current and potential roles of nurses in this process. Material and methods: This questionnaire-based study was conducted at the coordinated care facility Medical and Diagnostic Center (CMD) in Siedlce, Poland between March 1st and June 15th, 2017. Results: 138 patients participated in the study. The majority (75; 54.4%) reported they were directly convinced to undergo colonoscopy by a primary care physician. 18 (13.0%) were convinced by a nurse, and 22 (15.9%) by another specialist. The remaining (23; 16.7%) patients indicated other factors. The majority of patients (74; 53.6%) responded saying that all necessary information about the entire test course was provided by the nurse, while 35 (25.4%) shared that this information had come from the primary care physician, 8 (5.80%) from the specialist doctor, 3 (2.17%) from the receptionist and 18 (13.0%) from other sources of information, such as the Internet, leaflets and notice boards. Conclusions: We found that primary care physicians at this institution have an important role in convincing patients to undergo preventive colonoscopy, while nurses provide key information to patients on the preparation and the course of this procedure. Although the current model seems to be effective in a coordinated care setting, there may be still a place for nurse care coordinators to take on some tasks previously performed by doctors.
    Źródło:
    Medical Science Pulse; 2019, 13, 2
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Desorption of Helium from Defected Silicon
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Wójtowicz, A.
    Mączka, D.
    Yuschkevich, Y.
    Vaganov, Y.
    Żuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402210.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Vx
    61.72.uf
    Opis:
    The thermal desorption spectroscopy measurements of He implanted silicon samples are reported. The He implantation energy was 90 keV (at 45° tilt) while the fluence was 10¹⁶ cm¯². Additionally, the influence of Si pre-implantation (fluences in the range 10¹⁴-10¹⁶ cm¯², E=260 keV) was under investigation. The He releases from both interstitials/vacancies (β peak) and cavities (α peak or rather band consisting probably of at least two peaks) were observed. The α peak disappears for the pre-implantation fluences larger than 10¹⁵ cm¯², while β peak becomes broader and shifts toward higher temperatures. The thermal desorption spectra were collected using heating ramp rates in the range 0.3-0.7 K/s. Desorption activation energy of the β peak for different pre-implantation fluences was found using the Redhead analysis of the β peak shift. It varies from 0.97 eV for the sample that was not pre-implanted up to 1.3 eV for the sample pre-implanted with the fluence 10¹⁶ cm¯².
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 849-852
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of Linola and W92/72 transgenic flax seeds on the rabbit caecal fermentation - in vitro study
    Autorzy:
    Mista, D.
    Kroliczewska, B.
    Zawadzki, W.
    Pecka, E.
    Steininger, M.
    Hull, S.
    Zuk, M.
    Szopa, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/30370.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The effect of W92/72 transgenic flax seeds taken from a variety of Linola on the production of SCFA, ammonia and methane by bacteria inhabiting rabbit caecum was studied. The in vitro method was used where caecal contents from rabbits was incubated with W92/72 transgenic or Linola flax seeds, or without any additives (control samples).The total concentration of SCFA was higher in samples with the addition of flax seeds than in the control samples. The increase in concentrations of acetic, propionic and butyric acids was the highest in samples with Linola seeds added. A higher percentage of propionic and butyric acids was observed in the contents incubated with addition of flax seeds as compared to the control samples. This increase was the result of a percentage decrease in acetic acid. No differences were observed in the concentration of ammonia between fermented samples. Moreover, the addition of flax seeds resulted in slight decrease of pH in incubated samples. In gas samples, the methane level was higher in samples with flax seeds added, although the highest level was found in samples with transgenic seeds.In addition, gas pressure was significantly higher in samples with flax seeds added as compared to control samples, and this may indicate a higher intensity of microbiological fermentation processes. These studies suggest that neither Linola nor W92/72 flax seeds have any unfavorable effect on the caecal microflora activity of rabbits. A beneficial influence of flax seeds on the microbiological fermentation process in rabbit caecum was observed, based on an increase in percentage ratio of propionic acid in samples with flax seeds added.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Pattern Fabrication in Amorphous Silicon Carbide with High-Energy Focused Ion Beams
    Autorzy:
    Tsvetkova, T.
    Takahashi, S.
    Sellin, P.
    Gomez-Morilla, I.
    Angelov, O.
    Dimova-Malinovska, D.
    Zuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503892.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.75.Ak
    42.70.Ln
    68.37.Uv
    73.61.Jc
    Opis:
    Topographic and optical patterns have been fabricated in a-SiC films with a focused high-energy (1 MeV) $H^{+}$ and $He^{+}$ ion beam and examined with near-field techniques. The patterns have been characterized with atomic force microscopy and scanning near-field optical microscopy to reveal local topography and optical absorption changes as a result of the focused high-energy ion beam induced modification. Apart of a considerable thickness change (thinning tendency), which has been observed in the ion-irradiated areas, the near-field measurements confirm increases of optical absorption in these areas. Although the size of the fabricated optical patterns is in the micron-scale, the present development of the technique allows in principle writing optical patterns up to the nanoscale (several tens of nanometers). The observed values of the optical contrast modulation are sufficient to justify the efficiency of the method for optical data recording using high-energy focused ion beams.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 56-59
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Desorption Studies of $Ar^{+}$ Implanted Silicon
    Autorzy:
    Drozdziel, A.
    Wojtowicz, A.
    Turek, M.
    Pyszniak, K.
    Maczka, D.
    Slowinski, B.
    Yushkevich, Y.
    Zuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382778.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Vx
    61.72.uf
    Opis:
    Thermal desorption spectrometry measurements were performed for Ar implanted Si samples. Implantation energy $E_{i}$ varied in the range 85-175 keV. The release of implanted Ar in two steps was observed in the temperature range 930-1300 K: the relatively narrow peak at lower temperature ( ≈ 930 K for implantation fluence 5 × $10^{16}$ $cm^{-2}$) is due to the release of Ar from the agglomerations (bubbles) while the broader peak observed for higher temperatures ( ≈ 950 K for implantation fluence 5 × $10^{16}$ $cm^{-2}$) comes from Ar atoms diffusing out of the sample. Inverse order of peaks is observed compared to the results for lower energy implantations (< 50 keV). Analyzing the thermal desorption spectra collected for different heating ramp rates enabled estimation of the desorption activation energy (2 eV for $E_{i}$ = 85 keV and 1.7 eV for $E_{i}$ = 115 keV).
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1400-1403
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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