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    Wyświetlanie 1-12 z 12
    Tytuł:
    A Rough Estimation of Acoustics of the Cuboidal Room with Impedance Walls
    Autorzy:
    Kocan-Krawczyk, A.
    Brański, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177714.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fourier analysis
    room acoustics
    absorption coefficient
    boundary-value problem
    impedance boundary conditions
    Opis:
    The cuboidal room acoustics field is modelled with the Fourier method. A combination of uniform, impedance boundary conditions imposed on walls is assumed, and they are expressed by absorption coefficient values. The absorption coefficient, in the full range of its values in the discrete form, is considered. With above assumptions, the formula for a rough estimation of the cuboidal room acoustics is derived. This approximate formula expresses the mean sound pressure level as a function of the absorption coefficient, frequency, and volume of the room separately. It is derived based on the least-squares approximation theory and it is a novelty in the cuboidal room acoustics. Theoretical considerations are illustrated via numerical calculations performed for the 3D acoustic problem. Quantitative results received with the help of the approximate formula may be a point of reference to the numerical calculations.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 227-233
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Influence of the Wall Acoustic Impedance on the Room Acoustics. The Exact Solution
    Autorzy:
    Brański, A.
    Kocan-Krawczyk, A.
    Prędka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/177084.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fourier analysis
    architectural acoustics
    absorption coefficients
    boundary-value problems
    Opis:
    The Fourier method is applied to the description of the room acoustics field with the combination of uniform impedance boundary conditions imposed on some walls. These acoustic boundary conditions are expressed by absorption coefficient values In this problem, the Fourier method is derived as the combination of three one-dimensional Sturm-Liouville (S-L) problems with Robin-Robin boundary conditions at the first and second dimension and Robin-Neumann ones at the third dimension. The Fourier method requires an evaluation of eigenvalues and eigenfunctions of the Helmholtz equation, via the solution of the eigenvalue equation, in all directions. The graphic-analytical method is adopted to solve it It is assumed that the acoustic force constitutes a monopole source and finally the forced acoustic field is calculated. As a novelty, it is demonstrated that the Fourier method provides a useful and efficient approach for a room acoustics with different values of wall impedances. Theoretical considerations are illustrated for rectangular cross-section of the room with particular ratio. Results obtained in the paper will be a point of reference to the numerical calculations.
    Źródło:
    Archives of Acoustics; 2017, 42, 4; 677-687
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunohistochemical evaluation of hippocampal CA1 region astrocytes in 10 - day - old rats after monosodium glutamate treatment
    Autorzy:
    Krawczyk, A.
    Jaworska-Adamu, J.
    Rycerz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/30435.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    High concentration of glutamate (Glu) is excitotoxic for nervous system structures. This may lead to glial reactivity ie. increased expression of glial fibrillary acidic protein (GFAP) and S100β protein, and also to hypertrophy and proliferation of cells which are determined by the presence of Ki-67 antigen. The aim of the study was to analyse the immunoreactivity of the GFAP, S100β and Ki-67 proteins in astrocytes of hippocampal CA1 region in young rats after administration of monosodium glutamate (MSG) at two doses: 2 g/kg b.w. (I group) and 4 g/kg b.w. (II group). In rats from I and II group morphologically altered astrocytes with the GFAP expression were observed in the SLM of the hippocampal CA1 region. The cells had eccentrically located nuclei and on the opposite site of the nuclei there were single or double, long and weakly branched processes. Moreover, in the SLM the increase of the number of GFAP and S100β immunopositive astrocytes and nuclei with Ki-67 expression, in contrary to control individuals, was observed. These results suggest the increased expression of the proteins in early reactions or hyperplasia which, together with cell hypertrophy, indicate late reactivity of astroglia in response to glutamate noxious effect.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunoreactivity of arcuate nucleus astrocytes in rats after intragastric administration of habanero peppers (Capsicum Chinese Jacq.)
    Autorzy:
    Rycerz, K.
    Krawczyk, A.
    Jaworska-Adamu, J.
    Golynski, M.
    Lutnicki, K.
    Balicki, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/32031.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Habanero pepper fruits contain capsaicin (CAP) characterised by a spicy taste. Astrocytes express vanilloid receptor (TRPV1), which interacts with cannabinoids including CAP. Only a few studies revealed that CAP leads to alterations of the arcuate nucleus (ARC) structures. The aim of this study was to analyse the GFAP (GFAP-IR) and S100β (S100β-IR) immunoreactive astrocytes of ARC in adult rats after intragastric administration of habanero pepper fruits. Adult, Wistar rats received a peanut oil – control group (C) – and oil suspension of habanero pepper fruits at a dose of 0.08 g dm/kg b.w. for 7 days – E1 group – and 28 days – E2 group. After euthanasia, the brains were embedded in paraffin blocks using a routine histological technique. Frontal slices of ARC were immunohistochemically stained for GFAP and S100β using specific antibodies in the peroxidase-antiperoxidase method. Astrocytes of ARC were morphologically and morphometrically analysed under a light microscope. The results of the study did not reveal statistically significant changes in the density of GFAP-IR cells in E1 and E2 groups of rats in comparison with group C. A statistically significant increase in the density of S100β-IR astrocytes was observed in the E1 group and a decrease in the E2 group. Astrocytes with expression of both studied proteins were characterised by morphological alterations in ARC in the E2 group. The obtained results suggest an influence of CAP contained in habanero pepper fruits on the reactivity of astroglia, which may have an impact on the astrocyte-neuron interactions in order to maintain a proper activity of nervous cells in ARC.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunoreactivity for calretininin interneurons of the hippocampal CA1 field and dentate gyrus in adult rats after administration of habanero peppers (Capsicum chinense Jacq.)
    Autorzy:
    Jaworska-Adamu, J.
    Krawczyk, A.
    Rycerz, K.
    Gołyński, M.
    Wawrzyniak, A.
    Lutnicki, K.
    Balicki, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087682.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    capsaicin
    interneurons
    calretinin
    hippocampus
    rats
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 3; 469-474
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological properties of rail steel in straight moderately loaded sections of railway tracks
    Właściwości tribologiczne stali szynowych w prostych odcinkach średnioobciążonych torowisk
    Autorzy:
    Bąkowski, H.
    Posmyk, A.
    Krawczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351561.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stale szynowe
    zużycie ścierne
    zużycie zmęczeniowe
    bainitic rail steel
    pearlitic rail steel
    abrasive wear
    fatigue wear
    Opis:
    The paper describes the examination results of tribological properties of three types of steels used and suggested for rails manufacturing. The tests concentrated on loads, sliding and rolling speeds similar to those occurring in real conditions i.e. rolling track operation. Average loaded conditions were assumed and applied at straight railway track sections. Slight track declivity and high/low speeds of locomotive were considered. "Amsler" stand was used for laboratory tests. Three types of steels i.e. two pearlitic steels: WHT - without heat treatment, HT - with heat treatment (with the microstructure of fine pearlite) as well as one bainitic steel suggested for rail production have been tested. The measurements of wear, hardness, friction coefficient as well as structural changes at surface layers of the tested rollers have been performed during the test.
    W pracy opisano wyniki badań właściwości tribologicznych trzech stali stosowanych i proponowanych na szyny kolejowe. W badaniach tych stali na szyny stosowano obciążenia, poślizgi i prędkości toczenia podobne, jakie występują w warunkach rzeczywistych czyli w warunkach eksploatacji torowisk. Przyjęto warunki obciążenia występujące, jako średnio obciążone i zainstalowane na prostych odcinkach torów kolejowych przy uwzględnieniu niewielkiej pochyłości toru i przy prędkościach jazdy wagonu przy małej i dużej prędkości. Badania laboratoryjne przeprowadzono na tribotesterze " Amslera". Przebadano próbki trzech stali to jest dwie stale perlityczne - jedną z obróbką termiczną (o mikrostrukturze drobnego perlitu) a drugą bez obróbki oraz jedną stal o strukturze bainitycznej, proponowaną do wprowadzenia do produkcji szyn. W czasie badań mierzono zużycie, twardość, współczynnik tarcia oraz zmiany strukturalne w warstwach przypowierzchniowych badanych rolek wymienionych stali.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 3; 813-822
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carryover effects and amidosulfuron and tribenuron-methyl mixture on yielding of faba bean, sugar beet and winter rape seeded in crop rotation
    Autorzy:
    Adamczewski, K
    Paradowski, A.
    Krawczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/66598.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    amidosulphuron
    sulphonylurea
    oilseed rape
    residual effect
    crop rotation
    winter oilseed rape
    plant protection
    herbicide
    cereal field
    weed control
    tribenuron-methyl
    sugar-beet
    Opis:
    The aim of the experiments was to evaluate the effect of amidosulfuron and tribenuron-methyl used in spring barley on yield of winter rape, horse bean and sugar beet cultivated as rotation crop plants. The field experiments were conducted during two years. They were conducted at the Experimental Station of the Institute for Plant Protection at Winna Góra, and showed that amidosulfuron and tribenuron-methyl used in spring barley do not influence on yield of winter oil seed rape, horse bean and sugar beet cultivated in normal crop rotation.
    Przedmiotem badań była ocena działania następczego preparatów amidosulfuron i tribenuron-methylowego, zastosowanych wiosną w jęczmieniu jarym, na rośliny uprawiane w płodozmianie, które to rośliny wykazują dużą wrażliwość na preparaty sulfonomocznikowe, tj. burak cukrowy, rzepak ozimy i bobik. W dwuletnich badaniach po zastosowaniu zalecanych i wyższych dawek nie stwierdzono ujemnego wpływu tych preparatów na rośliny uprawiane po jęczmieniu jarym.
    Źródło:
    Journal of Plant Protection Research; 1998, 38, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rain water chemistry at Calypsobyen, Svalbard
    Autorzy:
    Krawczyk, Wiesława Ewa
    Bartoszewski, Stefan A.
    Siwek, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2051715.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Svalbard
    Bellsund
    precipitation
    long-range transport of pollutants
    Źródło:
    Polish Polar Research; 2008, 29, 2; 149-162
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Effects Induced in Liver Tissues by Pulsed Focused Ultrasonic Beams from Annular Array Transducer
    Autorzy:
    Kujawska, T.
    Secomski, W.
    Krawczyk, K.
    Nowicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176937.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    annular array transducer
    pulsed focused nonlinear ultrasound
    electronically moved focus
    tissue heating
    biological effects
    tissue necrosis
    Opis:
    Many therapeutic applications of pulsed focused ultrasound are based on heating of detected lesions which may be localized in tissues at different depths under the skin. In order to concentrate the acoustic energy inside tissues at desired depths a new approach using a planar multi-element annular array transducer with an electronically adjusted time-delay of excitation of its elements, was proposed. The 7-elements annular array transducer with 2.4 MHz center operating frequency and 20 mm outer diameter was produced. All its elements (central disc and 6 rings) had the same radiating area. The main purpose of this study was to investigate thermal fields induced in bovine liver in vitro by pulsed focused ultrasonic beams with various acoustic properties and electronically steered focal plane generated from the annular array transducer used. The measurements were performed for the radiating beams with the 20 mm focal depth. In order to maximize nonlinear effects introducing the important local temperature rise, the measurements have been performed in two-layer media comprising of a water layer, whose thickness was specific for the transducer used and equal to 13 mm, and the second layer of a bovine liver with a thickness of 20 mm. The thickness of the water layer was determined numerically as the axial distance where the amplitude of the second harmonics started to increase rapidly. The measurements of the temperature rise versus time were performed using a thermocouple placed inside the liver at the focus of the beam. The temperature rise induced in the bovine liver in vitro by beams with the average acoustic power of 1W, 2Wand 3Wand duty cycle of 1/5, 1/15 and 1/30, respectively, have been measured. For each beam used the exposure time needed for the local tissue heating to the temperature of 43.C (used in therapies based on ultrasonic enhancement of drug delivery or in therapies involving stimulation of immune system by enhancement of the heat shock proteins expression) and to the temperature of 56.C (used in HIFU therapies) was determined. Two sets of measurements were done for each beam considered. First, the thermocouple measurement of the temperature rise was done and next, the real-time monitoring of dynamics of growth of the necrosis area by using ultrasonic imaging technique, while the sample was exposed to the same acoustic beam. It was found that the necrosis area becomes visible in the ultrasonic image only for beams with the average acoustic power of 3 W, although after cutting the sample the thermo ablated area was visible with the naked eye even for the beams with lower acoustic power. The quantitative analysis of the obtained results allowed to determine the exposure time needed to get the necrosis area visible in the ultrasonic image.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 937-944
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual coordinate measuring machine built using Laser Tracer system and spherical standard
    Autorzy:
    Sładek, J.
    Gąska, A.
    Olszewska, M.
    Kupiec, R.
    Krawczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220886.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    virtual CMM model
    Monte Carlo method
    LaserTracer
    Opis:
    Improvements of modern manufacturing techniques implies more efficient production but also new challenges for coordinate metrologists. The crucial task here is a coordinate measurement accuracy assessment. It is important because according to technological requirements, measurements are useful only when they are stated with their accuracy. Currently used methods for the measurements accuracy estimation are difficult to implement and time consuming. It is therefore important to implement correct and validated methods that will also be easy to implement. The method presented in this paper is one of them. It is an on-line accuracy estimation method based on the virtual CMM idea. A model is built using a modern LaserTracer system and a common test sphere and its implementation lasts less than one day. Results obtained using the presented method are comparable to results of commonly used uncertainty estimation methods which proves its correct functioning. Its properties predispose it to be widely used both in laboratory and industrial conditions.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 77-86
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strain induced recrystallization in hot forged inconel 718 alloy
    Rekrystalizacja stopu inconel 718 indukowana odkształceniem podczas kucia matrycowego
    Autorzy:
    Krawczyk, J.
    Łukaszek-Sołek, A.
    Śleboda, T.
    Bała, P.
    Bednarek, S.
    Wojtaszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355033.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Inconel 718
    kucie matrycowe
    mikrostruktury
    hot forging
    recrystallization
    microstructure
    simulations
    Opis:
    Changes in the microstructure of Inconel 718 resulting from hot forging were investigated in this work. Axisymmetrical forging characterized by the areas of different forging reduction ratios was subjected to the analysis. The investigated alloy was forged under various thermomechanical conditions. Two forging modes, differing by the geometry and the temperature of the billet were performed in industrial conditions. It was revealed, that the microstructure of the alloy after forging was in the solutionized condition with different levels of recrystallization determining the differences in the grain size. Moreover, numerous simulations of the analyzed forging process taking into account variable thermomechanical conditions were performed using QForm 3D v. 5.1 software. The results of the simulations were compared with the results of forging the investigated alloy in industrial conditions. These results showed to be in very good agreement with the experimental observations. The changes in the microstructure of the investigated alloy forging were also compared with the results of the performed simulations. This study allowed determining both the influence of chosen thermomechanical parameters on recrystallization process in hot forged Inconel 718 alloy as well as the possibility of obtaining good quality forgings with uniform microstructure out of this alloy.
    W pracy przedstawiono wyniki badań zmian w mikrostrukturze stopu Inconel 718 powstałych w wyniku kucia. Kształtowano odkuwkę o kształcie zbliżonym do osiowosymetrycznego będącej jednocześnie przykładem odkuwki posiadającej obszary charakteryzujące sie różnym stopniem przerobu materiału. Pozwoliło to uzyskać złożone warunki termomechaniczne podczas kucia i po jego zakończeniu. Zastosowano dwa różne wymiary wsadu oraz dwie różne temperatury nagrzania do kucia. Stwierdzono, ze po kuciu mikrostruktura stopu jest w stanie przesyconym z różnym stopniem zaawansowania procesu rekrystalizacji oraz wielkości ziarna po rekrystalizacji. Przeprowadzono również szereg symulacji procesu kucia omawianego materiału w zmiennych warunkach cieplno mechanicznych z zastosowaniem programu QForm 3D v. 5.1. Odniesienie wyników modelowania numerycznego analizowanego procesu przeróbki plastycznej do uzyskanej mikrostruktury odkuwki pozwoliło na przedstawienie koncepcji roli warunków termomechanicznych na proces rekrystalizacji w stopie Inconel 718 oraz określenie możliwości kształtowania odkuwki z tego stopu w celu uzyskania jednorodnej mikrostruktury.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 2; 593-603
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility of FPGA to HPC computation migration of plasma impurities diagnostic algorithms
    Autorzy:
    Linczuk, P.
    Krawczyk, R. D.
    Zabolotny, W.
    Wojenski, A.
    Kolasinski, P.
    Pozniak, K. T.
    Kasprowicz, G.
    Chernyshova, M.
    Czarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226512.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma diagnostic
    GEM system
    feedback loops
    Intel Xeon
    Intel Xeon Phi
    high performance computing HPC
    Opis:
    We present a feasibility study of fast events parameters estimation algorithms regarding their execution time. It is the first stage of procedure used on data gathered from gas electron multiplier (GEM) detector for diagnostic of plasma impurities. Measured execution times are estimates of achievable times for future and more complex algorithms. The work covers usage of Intel Xeon and Intel Xeon Phi - high-performance computing (HPC) devices as a possible replacement for FPGA with highlighted advantages and disadvantages. Results show that less than 10 ms feedback loop can be obtained with the usage of 25% hardware resources in Intel Xeon or 10% resources in Intel Xeon Phi which leaves space for future increase of algorithms complexity. Moreover, this work contains a simplified overview of basic problems in actual measurement systems for diagnostic of plasma impurities, and emerging trends in developed solutions.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 3; 323-328
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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