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    Wyświetlanie 1-13 z 13
    Tytuł:
    Portable systemfor fault diagnostics of the fuel injectors of medium power maritime diesel engine with application of acoustic signal
    Przenośny system diagnostyki uszkodzeń wtryskiwaczy paliwa do morskich silników wysokoprężnych średniej mocy
    Autorzy:
    Bejger, A.
    Guzik, J.
    Marczak, M.
    Olszowski, S.
    Ranachowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/263100.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    Diagnostyka uszkodzeń wtryskiwaczy paliwa
    Morskie silniki wysokoprężne
    sygnały akustyczne
    wtryskiwacz paliwa
    Opis:
    The possibilities of the application of a portable system for registration of the acoustic signal in frequency range of 1000 - 10000 Hz for diagnostic of common faults of the fuel injection system of the maritime diesel engine is presented. Clear differences in the registered waveforms are occurring when the records of the working fuel injector are compared with those recordedfrom injector with blocked nozzle orifice and when insufficient amount of fuel is delivered. Signal signatures of the operating fuel pump at those operating conditions are also presented. A procedure of comparing of the acoustic signals registered of similar faulty and good injectors is recommended by the authors as efficient and easy for use.
    W pracy przedstawiono dane techniczne I przykład zastosowania praktycznego przenośnego systemu do rejestracji sygnału akustycznego w zakresie częstotliwości 1000 - 10000 Hz, przeznaczonego do diagnostyki typowych uszkodzeń układu zasilania w paliwo morskich silników wysokoprężnych. Jako przykłady zarejestrowanych sygnałów przedstawiono przebiegi uzyskane na wtryskiwaczu działającym poprawnie, wtryskiwaczu zakoksowanym oraz przy podaniu zbyt niskiej dawki paliwa. Dla porównania pokazano przebiegi tych samych sytuacji diagnostycznych uzyskane na króćcu wylotowym z pompy paliwowej. Diagnostyka detekcji uszkodzenia polega na porównaniu przebiegu zmierzonego na wtryskiwaczu uszkodzonym z przebiegami zmierzonym na wtryskiwaczach sprawnych, biorąc pod uwagę charakterystyczne zniekształcenia przebiegów opisane w tekście.
    Źródło:
    Archiwum Motoryzacji; 2005, 3; 199-207
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study on sugar radicals utilized for detection of radiation treatment of food
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146706.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    density functional theory (DFT)
    dried fruits
    electron paramagnetic resonance (EPR)
    irradiation
    mannose
    sorbose
    Opis:
    Radicals produced by ionizing radiation in sugars, the components of dried and raw fruits give rise to stable multicomponent electron paramagnetic resonance (EPR) signals unidentified so far. The subject of the present EPR study is to identify the radicals stabilized in gamma-irradiated crystalline sugars, D(+)mannose and L(-)sorbose extracted from cranberries (Vaccininum oxycoccos) and rowan berries (Sorbus aucuparia), respectively. EPR measurements and density functional theory (DFT) simulations were employed for that purpose.
    Źródło:
    Nukleonika; 2012, 57, 4; 545-549
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on stable radicals produced by ionizing radiation in dried fruits and related sugars by electron paramagnetic resonance spectrometry and photostimulated luminescence method – I. D-fructose
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147212.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fructose
    PPSL
    EPR
    irradiation
    detection
    food products
    Opis:
    Stability of sugar born radicals separated from irradiated Iranian dried raisins and from D-fructose by Sigma Aldrich has been studied at room temperature by EPR and PPSL methods in a period of 360 days. It has been proven for the first time experimentally that the complex EPR spectrum of irradiated sugars is changed in time and after heating. Hence, this made it possible to distinguish spectral lines of two specific radicals contributing to the formation of multicomponent spectra, recorded in both time dependent and heating experiments. The radicals measured by EPR and energy traps detected by PPSL decay at room temperature in a similar way, suggesting a similar distribution of both species in sugar crystallites. We think that our experimental approach might be useful to study interrelation between the formation and trapping of radicals and energy accumulated in crystalline matrices. In order to achieve the isolation of individual sugars from fruits the extraction and specific separation procedures have been adapted with the use of methanol, ethanol and water solvents. Our results clearly show that radicals induced by radiation in fruits (with fructose born radicals as major constituent) are stable enough at room temperature for easy identification of irradiated raisins using the EPR method.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 89-94
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of irradiated dried fruits using EPR spectroscopy
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148844.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dried fruits
    electron paramagnetic resonance (EPR)
    fructose
    glucose
    irradiation
    Opis:
    The dominating carbohydrates in fruits are monosaccharides like fructose, glucose, sorbose and mannose. In dehydrated fruits, concentration of monosaccharides is higher than in fresh fruits resulting in the formation of sugar crystallites. In most of dried fruits, crystalline fructose, and glucose dominate and appear in proportion near to 1:1. Irradiation of dried fruits stimulates radiation chemical processes resulting in the formation of new chemical products and free radicals giving rise to multicomponent EPR signal which can be detected for a long period of time. For that reason, it is used as a marker for the detection of radiation treatment of dried fruits. It has been found that EPR spectra recorded in dried banana, pineapple, papaya, and fig samples resemble the EPR spectrum obtained by computer addition of fructose and glucose spectra taken in proportion 1:1. The decay of radiation induced EPR signals proceeds in dried fruits fast during the first month of observation and becomes much slower and almost negligible after prolonged storage. However, it remains intense enough for EPR detection even one year after processing. The radiation induced EPR signal is easily detected in dried fruits exposed to 0.5 kGy of gamma rays. Thus, the EPR method of the detection of irradiated fruits can be used for the control of dried fruits undergoing quarantine treatment with 200–300 Gy of ionizing radiation.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 627-631
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Sol-Gel Glasses Doped with Lanthanide Ions by Spectroscopic, Acoustic, and Positron Annihilation Methods
    Autorzy:
    Jerie, K.
    Baranowski, A.
    Legendziewicz, J.
    Guzik, M.
    Burakowski, A.
    Gliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047126.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Jc
    43.35.Cg
    61.20.Qg
    61.25.Em
    62.60.+v
    78.70.Bj
    Opis:
    The results of optical spectroscopic (UV-Vis, absorption, and emission), acoustic (sound velocity of precursor solutions, the solvation numbers of ions in these solutions), and positron annihilation of glasses are presented and discussed for silica glasses obtained by the alcoholic sol-gel technique, doped with selected lanthanides and with some addition of ethylene glycol. The aim of these investigations was the determination of the local structure of glass close to lanthanide ions and its influence on the optical properties of the material. The results show that the existence of alcohol-glycol solvates in glasses decrease the number of empty voids in its structure as well as the size of the remaining ones. One can suppose that this is caused by cooperative interactions of glycol molecules with the network of hydrogen bonds of the glass.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 583-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inoculation of Austenite Primary Grains in Cast Iron
    Autorzy:
    Kopyciński, D.
    Guzik, E.
    Szczęsny, J.
    Dorula, J.
    Siekaniec, D.
    Ronduda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381068.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crystallization process
    grey cast iron
    primary austenite grain
    inoculation
    tensile strength
    krystalizacja
    żeliwo szare
    austenit
    wytrzymałość na rozciąganie
    Opis:
    The modification is a widespread method of improving the strength properties of cast iron. The impact in terms of increasing amounts of eutectic grains has been thoroughly studied while the issue of the impact on the mechanical properties of primary austenite grains has not been studied in depth yet. The paper presents the study of both aspects. The methodology was to conduct the melting cast iron with flake graphite, then modifying the alloy by two sets of modifiers: the commercial modifier, and a mixture of iron powder with a commercial inoculant. The DAAS test was carried out to identify the primary austenite grains. The degree of supercooling was determined and the UTS test was performed as well. Additionally carried out the metallographic specimen allowing for counting grains. It can be concluded that the introduction of the iron powder significantly improved the number of austenite primary grains which resulted in an increase in tensile strength UTS.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 45-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetric detrended fluctuation analysis reveals asymmetry in the rr intervals time series
    Autorzy:
    Mieszkowski, D.
    Kośmider, M.
    Krauze, T.
    Guzik, P.
    Piskorski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122480.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    scaling exponents
    random walk
    detrended fluctuation analysis
    deheart rate variability
    heart rate asymmetry
    wykładniki skalowania
    błądzenie losowe
    analiza fluktuacji
    zmienność rytmu serca
    asymetria rytmu serca
    Opis:
    In this paper we apply the Asymmetric Detrended Fluctuation Analysis to the RR intervals time series. The mathematical background of the ADFA method is discussed in the context of heart rate variability and heart rate asymmetry. We calculate the α- and α+ ADFA scaling exponents for 100 RR intervals time series recorded in a group of healthy volunteers (20-40 years of age) with the use of the local ADFA. It is found that on average α+ < α-, and that locally α- dominates most of the time over α+ - both results are highly statistically significant.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 99-106
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Transport Properties of RNiSb Compounds (R = Gd, Tb, Dy, Yb, Lu)
    Autorzy:
    Skolozdra, R. V.
    Guzik, A.
    Goryn, A. M.
    Pierre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964639.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    72.15.Eb
    72.20.Pa
    Opis:
    The structural, magnetic, electrical and thermoelectric properties of heavy rare-earths ternary compounds RNiSb were investigated. Except Yb-based compound (and nonmagnetic Lu), all compounds are low temperature antiferromagnets. YbNi$\text{}_{0.9}$Sb reflects some mixed valence behaviour. Magnitude of the resistivity indicates that investigated compounds are semimetals or high doped semiconductors.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 343-346
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of structure and abrasion resistance of the metal composite based on an intermetallic FeAl phase with VC and TiC precipitates
    Autorzy:
    Kopyciński, D.
    Guzik, E.
    Gilewski, R.
    Szczęsny, A.
    Dorula, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379554.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium cast iron
    Al4C3
    TiC
    VC
    intermetallic FeAl
    iron aluminides
    aluminium
    żeliwo
    faza międzymetaliczna FeAl
    aluminidek żelaza
    Opis:
    Metal alloys with matrix based on an Fe-Al system are generally considered materials for high-temperature applications. Their main advantages are compact crystallographic structure, long-range ordering and structural stability at high temperatures. These materials are based on an intermetallic phase of FeAl or Fe3Al, which is stable in the range from room temperature up to the melting point of 1240°C. Their application at high temperatures is also beneficial because of the low cost of production, very good resistance to oxidation and corrosion, and high mechanical strength. The casting alloy the structure of which includes the FeAl phase is, among others, high-aluminium cast iron. This study has been devoted to the determination of the effect of vanadium and titanium on the transformation of the high-aluminium cast iron structure into an in-situ FeAl-VC composite.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 51-54
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bootstrapping the empirical bounds on the variability of Sample Entropy in 24-hour ECG recordings for 1 hour segments
    Autorzy:
    Zurek, S.
    Grabowski, W.
    Kosmider, M.
    Jurga, S.
    Guzik, P.
    Piskorski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/973621.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    sample entropy
    complexity
    bootstrap
    heart rhythm variability
    zmienność rytmu serca
    entropia próbkowa
    elektrokardiogram
    szacowanie błędu
    Opis:
    We investigate the variability of one of the most often used complexity measures in the analysis of the time series of RR intervals, i.e. Sample Entropy. The analysis is carried out for a dense matrix of possible r thresholds in 79 24h recordings, for segments consisting of 5000 consecutive beats, randomly selected from the whole recording. It is repeated for the same recordings in random order. This study is made possible by the novel NCM algorithm which is many orders of magnitude faster than the alternative approaches. We find that the bootstrapped standard errors for Sample entropy are large for RR intervals in physiological order compared to the standard errors for shuffled data which correspond to the maximum available entropy. This result indicates that Sample Entropy varies widely over the circadian period. This paper is purely methodological and no physiological interpretations are attempted.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 2; 105-113
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical Behaviour of the Mean-Field Ferromagnet $Cu_{1.02}[Cr_{1.77}Ti_{0.24}]Se_4$
    Autorzy:
    Krok-Kowalski, J.
    Władarz, G.
    Rduch, P.
    Malicka, E.
    Groń, T.
    Guzik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409626.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.50.Dd
    64.60.Ht
    Opis:
    Magnetization, M, and susceptibility, χ, measurements showed both strong lowering of magnetic moment in comparison with $CuCr_2Se_4$ matrix and zero-field-cooling-field-cooling susceptibility splitting characteristic for the spin-glass behaviour. Isothermal magnetization curves, M(H), easy saturate and large values both of the Curie $T_{C}$=253 K and Curie-Weiss θ=283.5 K temperatures indicate the ferromagnetic order which coexists with the spin-glass state. The critical behaviour investigated around the paramagnetic-ferromagnetic phase transition revealed that the values of critical exponents are close to those predicted by the mean field model for long-range magnetic interactions.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1102-1104
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific Heat and Magnetic Structure of GdT$\text{}_{2}$X$\text{}_{2}$ Compounds (T = Cu, Ni, X = Sn, Sb)
    Autorzy:
    Kaczmarska, K.
    Pierre, J.
    Schmitt, D.
    Lambert-Andron, B.
    Belllisent, R.
    Guzik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964649.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.40.-s
    75.50.Ee
    Opis:
    The magnetic specific heat of GdNi$\text{}_{2}$Sn$\text{}_{2}$, GdNi$\text{}_{2}$Sb$\text{}_{2}$ and GdCu$\text{}_{2}$Sb$\text{}_{2}$ shows a λ-type anomaly at T$\text{}_{N}$ with a noticeable reduction of the discontinuity compared to that expected for a simple antiferromagnet. It can be associated with the existence of amplitude modulated magnetic structure just below T$\text{}_{N}$. Above T$\text{}_{N}$ a weak magnetic contribution is observed, evidencing the short-range ordering. From neutron diffraction studies it can be also concluded that investigated compounds have not simple antiferromagnetic structures. For GdNi$\text{}_{2}$Sn$\text{}_{2}$ the propagation vector Q=(0.3,1/2,1/2) was found with the magnetic moments along the [1,0,0] axis.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 347-350
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Simple Approach to Data Analysis for the Detection of Hazardous Materials by Means of Neutron Activation Analysis
    Autorzy:
    Kaźmierczak, Ł.
    Borsuk, S.
    Gierlik, M.
    Guzik, Z.
    Iwanowska-Hanke, J.
    Korolczuk, S.
    Kozłowski, T.
    Krakowski, T.
    Marcinkowski, R.
    Swiderski, L.
    Szeptycka, M.
    Szewiński, J.
    Urban, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402637.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.85.Fj
    Opis:
    Neutron activation analysis is a well-known method for determining isotopic composition of different materials. Due to the non-destructive nature of the method it can also be used in homeland security application, for example an inspection of packages of unknown origin. For this purpose hazardous material detection system (SWAN) was built. The device has an automatic decision algorithm that analyze the spectrum of gamma rays of $\text{}^{12}C,$ $\text{}^{14}N$ and $\text{}^{16}O$. Characteristic ratio of these lines gives the requested answer. Using such a simple approach SWAN is able to obtain promising results.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1540-1542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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