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    Tytuł:
    Enhancement of XPS surface sensitivity in nanocrystalline material
    Autorzy:
    Wróbel, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/778083.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    XPS
    nanomateriały
    badania powierzchni
    nanomaterials
    surface science
    Opis:
    The influence of the particle size on the surface sensitivity in XPS analysis was investigated. Previous reports about such influence were qualitatively only. In this report there are given mathematical description of XPS sensitivity and quantitative results. It was found that influence due to nanometric size on XPS analysis can be noticeable for particles below 15 nm of diameter and increases dramatically with reduction of the size.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 4; 62-63
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the carbon dioxide uptake efficiency of activated carbons using a secondary activation with potassium hydroxide
    Autorzy:
    Zgrzebnicki, M.
    Michalczyszyn, E.
    Wrobel, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/778515.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon
    activation
    pore size distribution
    DFT
    Opis:
    Secondary activation of commercial activated carbon (AC) ORGANOSORB 10-CO was carried out at 600, 700 and 800°C with mass ratios of potassium to AC (K/AC) in range 1–3. Crucial samples have shown following CO2  uptakes and SSA – 3.90 mmol/g and 1225 m2/g, 4.54 mmol/g and 1546 m2/g, 4.28 and 1717 m2/g for pristine material and samples obtained at 700°C with K/AC = 2 and at 800°C with K/AC = 3 respectively. Last sample also indicated significant mesopore volume increase in diameter range 2–5 nm, from 0.11 to 0.24 cm3/g. CO2 uptake increase was explained by formation of micropores up to diameter of 0.8 nm, which distribution was established from CO2  sorption using DFT. Surface chemistry of all samples has not changed during modification, what was proven by XPS. Moreover, deeper incorporation of potassium ions into graphite at higher temperatures was observed as confirmed with EDS, XPS and XRD.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 3; 87-94
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrically conductive acrylic pressure-sensitive adhesives containing carbon black
    Autorzy:
    Czech, Z.
    Pełech, R.
    Kowalczyk, A.
    Kowalski, A.
    Wróbel, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779803.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    akrylowe kleje samoprzylepne
    sadza
    materiały przewodzące elektryczność
    acrylic pressure-sensitive adhesives
    carbon black
    electrical conductive materials
    Opis:
    Acrylic pressure-sensitive adhesives (PSA) are non electrical conductive materials. The electrical conductivity is incorporated into acrylic self-adhesive polymer after adding electrically conductive additives like carbon black, especially nano carbon black. After an addition of electrical conductive carbon black, the main and typical properties of pressure-sensitive adhesives such as tack, peel adhesion and shear strength, are deteriorated. The investigations reveals that the acrylic pressure-sensitive adhesives basis must be synthesised with ameliorated initial performances, like high tack, excellent adhesion and very good cohesion. Currently, the electrical conductive solvent-borne acrylic PSA containing carbon black are not commercially available on the market. They are promising materials which can be applied for the manufacturing of diverse technical high performance self-adhesive products, such as broadest line of special electrically conductive sensitive tapes.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 77-81
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Commercial Kevlar derived activated carbons for CO2 and C2H4 sorption
    Autorzy:
    Kaliszewski, M.
    Zgrzebnicki, M.
    Kałamaga, A.
    Pinjara, S.
    Wróbel, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849281.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon
    carbonaceous catalysts
    autoxidation
    alpha-pinene
    iron particles
    biomass
    Opis:
    The carbonaceous precursor was obtained via pyrolysis of commercial aramid polymer (Kevlar). Additionally the precursor was activated at 1000°C in CO2 atmosphere for different times. Obtained materials were characterised by BET; XPS; SEM and optical microscopy. The sorption capacities were determined by temperature swing adsorption performed in TGA apparatus for CO2 and C2H4 gases. The obtained materials exhibit high difference in sorption of these gases i.e. 1.5 and 2.8 mmol/g @30°C respectively and high SSA ~1600 m2/g what can be applied in separation applications. The highest uptakes were 1.8 and 3.1 mmol/g @30°C respectively. It was found that the presence of oxygen and nitrogen functional groups enhances C2H4/CO2 uptake ratio.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 81-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and antibacterial properties of Fe3O4-Ag nanostructures
    Autorzy:
    Pachla, A.
    Lendzion-Bieluń, Z.
    Moszyński, D.
    Markowska-Szczupak, A.
    Narkiewicz, U.
    Wróbel, R. J.
    Guskos, N.
    Żołnierkiewicz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/778603.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Fe3O4 nanoparticles
    superparamagnetic nanoparticles
    silver nanoparticles
    Opis:
    Superparamagnetic iron oxide nanoparticles were obtained in the polyethylene glycol environment. An effect of precipitation and drying temperatures on the size of the prepared nanoparticles was observed. Superparamagnetic iron oxide Fe3O4 , around of 15 nm, was obtained at a precipitation temperature of 80°C and a drying temperature of 60°C. The presence of functional groups characteristic for a polyethylene glycol surfactant on the surface of nanoparticles was confirmed by FTIR and XPS measurements. Silver nanoparticles were introduced by the impregnation. Fe3O4-Ag nanostructure with bactericidal properties against Escherichia coli species was produced. Interesting magnetic properties of these materials may be helpful to separate the bactericidal agent from the solution.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 110-116
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja internetowego systemu do doboru elementów znormalizowanych
    Optimization of internet system to select normalized elements
    Autorzy:
    Wróbel, J.
    Raczko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/209859.pdf
    Data publikacji:
    2007
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    optymalizacja
    Internet
    łożyska toczne
    elementy maszyn
    optimization
    rolling bearing
    machine elements
    Opis:
    W pracy omówiono proces optymalizacji internetowego systemu do doboru elementów znormalizowanych. Zwrócono szczególną uwagę na środowisko sieciowe, w którym pracuje. Przedstawiono wyniki eksperymentów umożliwiających określenie systemu minimalizującego czas przetwarzania informacji i wymiany danych, minimalizującego obciążenie zasobów oraz maksymalizującego wydajność.
    In the paper, the process of optimization of the Internet system to select normalized elements was presented. The network environment in which it works was taken into consideration. The results of experiments enabling the qualification of system minimizing the time of the information processing and exchange of data, minimizing the burden of supplies as well as maximizing the efficiency were introduced.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2007, 56, sp.1; 105-114
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fetal state evaluation with fuzzy analysis of newborn attributes using CUDA architecture
    Autorzy:
    Czabański, R.
    Wróbel, J.
    Jeżewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333255.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    fuzzy systems
    fetal monitoring
    support vector machines
    CUDA architecture
    systemy rozmyte
    monitorowanie płodu
    architektura CUDA
    Opis:
    Cardiotocography is a biophysical method of fetal state evaluation involving the recording and analysis of the fetal heart rate (FHR). Since a proper interpretation of the signal is relatively difficult, an automatic classification is often based on computational intelligence methods. The quality of classifiers based on supervised learning algorithms depends on a proper selection of learning data. In case of the fetal state evaluation, the learning is usually based on a set of quantitative parameters of FHR signal and the corresponding reference information determined on the basis of the retrospective analysis of newborn attributes. Values of the single attribute have been used so far as a reference. As a result, a part of information on the actual neonatal outcome has always been lost. The following paper presents a method of the fuzzy reasoning leading to an evaluation of neonatal outcome as a function of three newborn attributes. The fuzzy system was used in the process of a qualitative evaluation of the fetal state based on quantitative analysis of FHR signal using a support vector machine (SVM). In order to improve computational effectiveness, the learning algorithm was implemented in Compute Unified Device Architecture (CUDA). The results of these studies confirm the effectiveness of the proposed method and indicate the possibility of practical usage of the fuzzy system in supervised learning algorithms for the qualitative evaluation of the fetal state.
    Źródło:
    Journal of Medical Informatics & Technologies; 2013, 22; 125-133
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Numerical Modelling to Determine the Conditions of Regeneration of Medium Carbon Steel
    Autorzy:
    Bęczkowski, R.
    Wróbel, J.
    Kulawik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/356535.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    regeneration process
    preheating
    numerical modeling
    mechanical phenomena
    phase transformations
    Opis:
    In the paper, the regeneration process of the material in grade C45 using the MAG welding was analysed. The effect of preheating on the properties of the regenerated layers was determined. Preheating technology was used to facilitate the process of regeneration and minimize the risk of imperfections. The use of numerical methods allows one to observe the direction of changes in the properties, structures and emerging stresses and accompanying strains of the elements depending on the temperature applied for preheating. Modeling of the stress state in the element made of medium carbon steel during the regeneration process was performed on original software based on the finite element method. The implemented numerical model consists of three basic elements – thermal phenomena, mechanical phenomena and phase transformations in the solid state. The performed numerical analysis made determining the optimum heating conditions possible, so that the material in the area of joint didn’t show tendency to create structural notches associated with the stress state.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2223-2230
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the quality of the fetal state assessment with epsilon-insensitive learning methods
    Autorzy:
    Czabański, R.
    Wróbel, J.
    Jeżewski, J.
    Łęski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333468.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    fetal monitoring
    fuzzy implication
    epsilon-insensitive learning
    monitorowanie płodu
    implikacja rozmyta
    Opis:
    Recording and analysis of fetal heart rate (FHR) signal is nowadays the primary method for the biophysical assessment of the fetal state. Since the correct interpretation of crucial FHR characteristics is difficult, methods of automated quantitative signal evaluation are still the subject of the research studies. In the following paper we investigated the possibility of improvement of the fetal state evaluation on the basis of the epsilon-insensitive learning (eIL). We examined two eIL procedures integrated with fuzzy clustering algorithms as well as different methods of logical interpretation of the fuzzy conditional statements. The quality of the FHR signal classification was evaluated using the data collected with the computerized fetal surveillance system. The learning performance was measured with the number of correct classification (CC) and overall quality index (QI) defined as a geometric mean of sensitivity and specificity. The obtained results (CC = 88 % and QI = 87 %) show a high efficiency of the fetal state assessment using the epsilon-insensitive learning based methods.
    Źródło:
    Journal of Medical Informatics & Technologies; 2014, 23; 19-26
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the efficiency of the three-way catalytic converter of a spark ignition engine of the chosen aromatic hydrocarbons removing
    Autorzy:
    Skrętowicz, M.
    Woźniak, J.
    Wróbel, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/133224.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    hydrocarbons
    three-way catalytic converter
    TWC
    exhaust
    benzene
    toluene
    xylenes
    BTX
    spark ignition engines
    węglowodory
    reaktor katalityczny trójfunkcyjny
    spaliny
    benzen
    toluen
    ksylen
    silnik z zapłonem iskrowym
    Opis:
    In the paper the results of measurement of the most popular aromatic hydrocarbons (benzene, toluene and xylenes) in the exhaust of spark ignition engine before and after three-way catalytic reactor were presented. The investigations have been conducted at fixed rotational speed, 2500 rpm and at a few different values of torque in range 0 – 80 Nm, every 10 Nm. Based on obtained results, the calculations of catalytic reactor efficiency in removing analysed components have been made. The measurements showed high efficiency of the catalytic converter in reduction of that pollutants in exhaust gases.
    Źródło:
    Combustion Engines; 2017, 56, 2; 83-86
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method of engines’ diagnosis in operationA method of engines’ diagnosis in operationA method of engines’ diagnosis in operation
    Autorzy:
    Sitnik, L.J.
    Sroka, Z. J.
    Wróbel, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/245541.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    combustion engine
    engine diagnostic
    diagnostic methods
    engine technical conditions
    Opis:
    It was found that there are discrepancies between the values of diagnostic parameters obtained in the test and natural exploitation. In addition, no appropriate tests are carried out which would be based on the degree of engine degradation in long-term natural use. One of the reasons is the lack of adequate, non-invasive diagnostic methods. The aim of the work was to show the possibility of creating a new diagnostic parameter of combustion engines in their natural operation. The parameter can be determined by a new method (presented in the article). The method is based on the assumption that the technical condition of the engine can be judged on the basis of the run-up curve, and in particular, on the basis of the linear direction coefficient, which is approximated by the points of the run-up curve at particular moments of the run-up. An additional requirement is that the points of the run-up curve are the average value of the speed from many runs. In addition, the statistical distributions of the speed values in the individual moments of the run-up should be of the same type. The direction coefficient of the straight line determined is a diagnostic parameter. The value of the new coefficient is the value of the straight-line factor. Further works are underway to determine the relationship between the directional coefficient and the technical condition of the engine.
    Źródło:
    Journal of KONES; 2018, 25, 3; 403-410
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The energy harvesting from waste heat
    Autorzy:
    Kardasz, P.
    Wróbel, R.
    Doskocz, J.
    Wiejkut, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189724.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    waste heat harvesting
    thermoelectric effect
    thermoelectric generators
    a Peltier cell
    Opis:
    The article focuses on the use of thermoelectrics for the energy harvesting from waste heat. There were discussed the thermoelectric effects and the solutions of converting the waste heat into electricity were shown. The application and operation of thermoelectrics for heat recovery from cars, the cogeneration of heat for home and in wristwatches were presented. An analysis of the possibilities of using Peltier cells in municipal and long-distance transport was conducted. The aim of the study was to evaluate the possibility of reducing fuel costs by obtaining electricity from the Peltier cells instead of the alternator. The efficiency tests of operation the Peltier cells were carried out. On their basis was possible to determine the amount of recovered energy thanks to their use. On the basis of calculations it was concluded that at the current price of unit cell, the use of this solution is not fully economically justifiable. However, there are possible solutions that could increase the efficiency of the cell. The advantages of using cells is reducing the vehicle engine wear and emission of harmful substances into the environment. It was found that most justifiable is the mounting of cells in vehicles equipped with multiple electrical receivers with low efficiency of the engine. It was indicated that more and more new thermoelectric materials that provide efficient and cheap energy harvesting on a large scale are looking for. In Google Patents and Espacenet are posted many solutions of waste heat recovery, which indicates that this field is constantly evolving.
    Źródło:
    World Scientific News; 2016, 48; 133-148
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Numerical Analysis of the Phenomena of Superficial Hardening of the Hot-Work Tool Steel Elements
    Analiza numeryczna zjawisk przypowierzchniowego hartowania elementów ze stali narzędziowej do pracy na gorąco
    Autorzy:
    Bokota, A.
    Kulawik, A.
    Szymczyk, R.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356335.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    hot-work tool steel
    phase transformations
    thermo-elastic-plastic finite element analysis
    obróbka cieplna
    stal narzędziowa do pracy na gorąco
    przemiany fazowe
    odkształcenia cieplne
    odkształcenia plastyczne
    odkształcenia transformacyjne
    Opis:
    In the paper the complex model of hardening of the hot-work tool steel is presented. Model of estimation of phase fractions and their kinetics is based on the continuous heating diagram (CHT) and cooling diagram (CCT). Phase fractions which occur during the continuous heating and cooling (austenite, pearlite or bainite) are described by Johnson-Mehl (JM) formula. To determine of the formed martensite the modified Koistinen-Marburger (KM) equation is used. Model takes into account the thermal, structural, plastic strains and transformation plasticity. To calculate the plastic strains the Huber-Mises plasticity condition with isotopic hardening is used. Whereas to determine transformations induced plasticity the Leblond model is applied. The numerical analysis of phase compositions and residual stresses in the hot-work steel (W360) element is considered.
    W pracy przedstawiono kompleksowy model hartowania stali narzędziowej do pracy na gorąco. Model szacowania ułamków faz oraz ich kinetyki oparto na wykresach ciągłego nagrzewania (CTPA) oraz chłodzenia (CTPc). Ułamki faz powstałych podczas ciągłego nagrzewania i chłodzenia (austenit, perlit lub bainit) wyznaczane są równaniem Johnsona- Mehla. Do określenia tworzącego się martenzytu wykorzystano zmodyfikowane równanie Koistinena i Marburgera. W modelu uwzględniono odkształcenia cieplne, strukturalne, plastyczne oraz odkształcenia transformacyjne. Do wyznaczania odkształceń plastycznych zastosowano warunek plastyczności Hubera-Misesa ze wzmocnieniem izotropowym, natomiast do wyznaczenia odkształceń transformacyjnych wykorzystano model Leblonda. Dokonano analizy numerycznej składu fazowego oraz naprężeń hartowniczych w elementach wykonanych ze stali narzędziowej do pracy na gorąco (W360).
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2763-2772
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the limits of quotients of polynomials in two variables
    Autorzy:
    Wituła, R.
    Hetmaniok, E.
    Wróbel, A.
    Matlak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122528.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Cauchy polynomials
    Ma polynomials
    Ferrers-Jackson polynomials
    limits of quotients of multivariable polynomials
    Opis:
    The aim of this paper is to discuss different types of decompositions and factorizations concerning a few families of symmetric polynomials in two variables including Ma polynomials, classic Cauchy polynomials, Ferrers-Jackson polynomials and some elementary polynomials as well. Application of the discussed decompositions and factorizations for determining the limits of quotients of the respective polynomials in two variables is presented here and some general theorems on these limits are also proven in this elaboration.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 1; 121-132
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy system for evaluation of fetal heart rate signals using FIGO criteria
    Autorzy:
    Czabański, R.
    Jeżewski, M.
    Wróbel, J.
    Jeżewski, J.
    Horoba, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/333142.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    monitoring płodu
    tętno płodu
    kryteria FIGO
    fetal monitoring
    fetal heart rate
    signal classification
    fuzzy systems
    Opis:
    Cardiotocography is a biophysical method of fetal monitoring during pregnancy and labour. It is mainly based on recording and analysis of fetal heart activity. The computerized fetal monitoring systems provide the quantitative description of the recorded signals but the effective methods supporting the conclusion generation are still needed. The evaluation of the signal can be made using criteria recommended by FIGO. Nevertheless, the quantitative description of the traces is inconsistent with qualitative nature of the obstetric knowledge. Therefore, we applied the fuzzy system based on Takagi-Sugeno-Kang model to evaluate and classify signals. FIGO guidelines were used for developing a set of fuzzy conditional rules defining the system performance. The proposed system was evaluated using data collected with computerized fetal surveillance system – MONAKO. The classification results confirm the improvement of the fetal state evaluation quality while using the proposed fuzzy system support.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 189-194
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Model and Numerical Analysis of Hardening Phenomena for Hot-work Tool Steel
    Autorzy:
    Bokota, A.
    Kulawik, A.
    Szymczyk, R.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382306.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    tool steel
    phase transformation
    stresses
    finite element analysis
    obróbka cieplna
    stal narzędziowa
    przemiany fazowe
    naprężenia
    metoda elementów skończonych
    Opis:
    In the paper the complex model of hardening of the hot-work tool steel is presented. Model of estimation of phase fractions and their kinetics is based on the continuous cooling diagram (CCT). Phase fractions which occur during the continuous heating and cooling (austenite, pearlite or bainite) are described by Johnson-Mehl-Avrami-Kolmogorov (JMAK) formula. To determine of the formed martensite the modified Koistinen-Marburger (KM) equation is used. The stresses and strains are calculated by the solution of equilibrium equations in the rate form. Model takes into account the thermal, structural, plastic strains and transformation plasticity. The thermophysical properties occurring in the constitutive relations are dependent on phase compositions and temperature. To calculate the plastic strains the Huber-Mises plasticity condition with isotopic hardening is used. Whereas to determine transformations induced plasticity the Leblond model is applied. The numerical analysis of phase compositions and residual stresses in the hot-work steel element is considered.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 9-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The prediction of the low fetal birth weight based on quantitative description of cardiotocographic signals
    Autorzy:
    Czabański, R.
    Jeżewski, M.
    Wróbel, J.
    Kupka, T.
    Łęski, J.
    Jeżewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333495.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    weryfikacja podpisu online
    programowanie dynamiczne
    online signature verification
    feature context
    dynamic programming
    Opis:
    Cardiotocography (CTG) is a routine method of fetal condition assessment used in modern obstetrics. It is a biophysical method based on simultaneous recording and analysis of activity of fetal heart, fetal movements and maternal uterine contractions. The fetal condition is diagnosed on the basis of printed CTG trace evaluation. The correct interpretation of CTG traces from a bedside monitor is very difficult even for experienced clinicians. Therefore, computerized fetal monitoring systems are used to yield the quantitative description of the signal. However, the effective methods, aiming to support the conclusion generation, are still being searched. One of the most important features defining the state of fetal outcome is the weight of the newborn. The presented work describes an application of the Artificial Neural Network Based on Logical Interpretation of fuzzy if-then Rules (ANBLIR) to evaluate the risk of the low birth weight using a set of parameters quantitatively describing the CTG traces. The obtained results confirm that the neuro-fuzzy based CTG classification methods are very efficient for the prediction of the fetal outcome.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 97-102
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of gestational age on neural networks interpretation of fetal monitoring signals
    Autorzy:
    Jeżewski, M.
    Czabański, R.
    Horoba, K.
    Wróbel, J.
    Łęski, J.
    Jeżewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333505.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    monitoring płodu
    kardiotokografia
    klasyfikacja
    sieci neuronowe
    fetal monitoring
    cardiotocography
    classification
    neural networks (NN)
    Opis:
    Cardiotocographic monitoring (CTG) is a primary biophysical monitoring method for assessment of the fetal state and is based on analysis of fetal heart rate, uterine contraction activity and fetal movement signals. Visual analysis of CTG traces is very difficult so computer-aided fetal monitoring systems have become a standard in clinical centres. We proposed the application of neural networks for the prediction of fetal outcome using the parameters of quantitative description of acquired signals as inputs. We focused on the influence of the gestational age (during trace recording) on the fetal outcome classification quality. We designed MLP and RBF neural networks with changing the number of neurons in the hidden layer to find the best structure. Networks were trained and tested fifty times, with random cases assignment to training, validating and testing subset. We obtained the value of sensitivity index above 0.7, what may be regarded as good result. However additional trace grouping within similar gestational age, increased classification quality in the case of MLP networks.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 137-142
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uboczne produkty wzbogacania węgla źródłem paliw i kruszyw : gospodarka odpadami poprodukcyjnymi w kopalniach Południowego Koncernu Węglowego SA
    By-products of Coal Enrichment as a Source of Fuel and Aggregates : Management of Post-Production Waste in the Mines of the Southern Concern Coal Company
    Autorzy:
    Wróbel, J.
    Fraś, A.
    Przystaś, R.
    Hycnar, J.
    Tora, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/318737.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    odpady
    muły węglowe
    mieszanki kruszywowe
    spoiwa
    waste products
    coal slime
    aggregate-binder blends
    Opis:
    Tauron Wydobycie, spółka należąca do Grupy TAURON, prowadzi politykę ograniczania ilości produkowanych odpadów wydobywczych, a docelowo ich całkowite gospodarowanie, prowadzi wysiłki w celu wykorzystania mułów węglowych i odpadów górniczych jako użytecznych produktów. Przeprowadzone badania i wdrożenia przynoszą Południowemu Koncernowi Węglowemu efekty technologiczne, ekologiczne i ekonomiczne. Wiele rozwiązań jest chronionych patentami a niektóre z nich otrzymały międzynarodowe nagrody. Prowadzony odzysk odpadów zmniejszył ich ilość zdeponowanych na składowiskach, a jednocześnie zmniejszyło zużycie surowców pierwotnych a także zwiększyło powierzchnię terenów poddanych rekultywacji i rewitalizacji. Większość prowadzonych procesów odzysku odpadów przyczyniła się do obniżenia kosztów unieszkodliwiania odpadów przy jednoczesnym osiągnięciu zysków ze sprzedaży paliw granulowanych, kruszyw. Ponadto działania te były i są źródłem istotnych efektów ekonomicznych. Uzyskane wyniki stały się możliwe dzięki wdrożeniu przez Spółkę polityki środowiskowej i dobrej współpracy z uczelniami, instytutami badawczymi i ośrodkami technologicznymi oraz dokonały inwestycji. Realizowane projekty inwestycyjne charakteryzowały się okresem spłaty od 8 do 24 miesięcy.
    Tauron Mining which is a part of TAURON Group pursues a policy of limiting the quantities of produced extractive waste, and in the future their total management, leads an efforts to process coal slurry and waste rocks into useful products. A carried out studies and implementations bring to Southern Poland Coal Company an intellectual, ecological and economical effects. A number of solutions are protected with patent declarations, and some of them have received international award. A conducted waste recovery reduced their quantity on the mine waste dump and simultaneously decreased the consumption of mineral resources and increased the acreage of objects and areas for recultivation and revitalization. Most of the ongoing recovery processes have contributed to a reduction of the costs of waste disposal while the occurrence of profits from the sale of granulated fuels, aggregates and aggregate binder mixtures. In addition, these activities were and are a source of significant economic effects among users of granulated coal slurry, aggregates and aggregate binder mixtures. Obtained results became possible thanks to the Company’s implementation of environmental policy and good cooperation with universities, research institutes and technology centres and made investments. Existing investment projects were characterized with payback period from 8 to 24 months.
    Źródło:
    Inżynieria Mineralna; 2017, R. 18, nr 2, 2; 39-45
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of mileage fuel consumption with the natural operation of the three different cycles
    Autorzy:
    Sitnik, L. J.
    Magdziarz-Tokłowicz, M.
    Walkowiak, Wł.
    Wróbel, R.
    Włostowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/243579.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    fuel consumption
    mileage fuel consumption
    resistance to motion
    energy consumption of traffic
    vehicle operation
    SI engine
    Opis:
    In the automotive industry in the world continuously being sought universal driving cycle. The test should closely match the fuel consumption and emissions of toxins in the fumes of the test vehicle in its real operating conditions [4]. However, in the previously developed solid driving tests established velocity profiles differ significantly from actual driving conditions. The difference in fuel consumption, comparing the natural operation of the NEDC test reaches an average of 18%. The new version of the driving cycle should be more realistic to the everyday use of additional equipment and gadgets that are installed in modern vehicles [1]. The impact on fuel consumption by vehicles may be conditioned not only by its size and weight, but also by the geometry of the track motion, forces causing the motion and the forces acting on the car when driving on curved tracks. The vehicle encounters and overcomes all the forces that act on it while driving-resistance movement. In the energy intake through the vehicle runs in the motor changes at the expense of the energy of fuel consumed. The driving force performs work on a given stretch of road balancing (predominant) friction. On the basis of the calculated resistance movement and the energy consumption of the movement in the selected object was a comparison of the actual consumption of fuel in the vehicle with the ignition spark. Analysis was performed and found differences in three cycles: urban, extra-urban and combined.
    Źródło:
    Journal of KONES; 2014, 21, 4; 439-444
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of electrical uterine contractile activity for prediction of preterm delivery
    Autorzy:
    Horoba, K.
    Jezewski, J.
    Matonia, A.
    Wrobel, J.
    Czabanski, R.
    Jezewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333763.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    electrical uterine activity
    electrohysterography
    preterm delivery prediction
    aktywność elektryczna macicy
    elektrohisterografia
    przewidywanie porodu przedwczesnego
    Opis:
    This study is aimed at evaluation of the capability to indicate the preterm delivery risk analysing the features extracted from signals of electrical uterine activity. Free access database was used with signals acquired in two groups of pregnant women who delivered at term and preterm. Signal features comprised classical time domain and spectral parameters of contractile activity, as well as the sample entropy. Their mean values were calculated over all contraction episodes detected in each record and their statistical significance for separating the two groups of recordings was provided. Influence of electrodes location, band-pass filter settings and gestation week was investigated. The obtained results showed that a spectral parameter – the median frequency was the most promising indicator of the preterm delivery risk.
    Źródło:
    Journal of Medical Informatics & Technologies; 2015, 24; 199-205
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Personal identity verification method based on lips photographs
    Autorzy:
    Wrobel, K.
    Doroz, R.
    Porwik, P.
    Naruniec, J.
    Kowalski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333548.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    biometrics
    lip features
    data classification
    biometria
    cechy wargi
    klasyfikacja danych
    Opis:
    The paper presents a personal identification method based on lips photographs. This method uses a new approach to the extraction and classification of characteristic features of the mouth from photographs. It eliminates the drawbacks that occur during the acquisition of lip print images with the use of the forensic method that requires special tools. Geometrical dimensions of the entire mouth as well as of the upper and lower lips were adopted as the features, on the basis of which the verification is performed. An ensemble classifier was used for the classification of the features obtained. The effectiveness of the classifier has been verified experimentally.
    Źródło:
    Journal of Medical Informatics & Technologies; 2015, 24; 59-65
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vehicle vibration in human health
    Autorzy:
    Sitnik, L.J.
    Magdziak-Tokłowicz, M.
    Wróbel, R.
    Kardasz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/242806.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    noise and vibration
    laser Doppler vibrometry
    digital signal processing
    Opis:
    Fast development of technology over the last decades has contributed to the adverse effects that may affect human health (both physical and mental). Such negative effects may include noise and vibration. These phenomena are accompanied by most of the technological processes. Need for more efficient and productive processes is causing rising trend in intensifying of these phenomena. It is unavoidable to increase efficiency without increasing the operating speed of machinery and equipment. The main goal of this paper is to carry out NVH (noise, vibration and harshness) analysis of engines; compression-ignition engine (diesel) and spark-ignition engine (gasoline) equipped in the same type of vehicle. But purpose is laying on presented methodology, not results of researches (but of course it will be presented too) which often (mainly) is made for failure detections. This paper will also cover influence of the engine mounting on generated acoustic vibrations followed by comparative NVH analysis of states occurring in diesel and gasoline engine. Scope of the work: a) theoretical introduction, b) presentation of vibration measurement (using LDV: Laser Doppler Vibrometry), c) NVH analysis in two types of engines, d) comparison of results, e) conclusions.
    Źródło:
    Journal of KONES; 2013, 20, 4; 411-418
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure
    Autorzy:
    Czerwiec, J.
    Dąbrowski, R.
    Żurowska, M.
    Ziobro, D.
    Wróbel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538235.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Nh
    78.15.+e
    64.70.M-
    Opis:
    Mesomorphic, thermodynamic, electro-optic and dielectric properties of three homologues of fluorosubstituted esters are described. Full chemical names of these compounds are as follows: (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-penta-fluoro-propano-ynloxyhex-1-oxy)-biphenyl-4-yl (in short 2F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-nona-fluoro-pentano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 4F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-trideca-fluoro-heptano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 6F6BBiOC8). The compounds exhibit ferroelectric smectic C* phase between crystalline and isotropic phase. Only one compound (6F6BBiOC8) shows antiferroelectric phase $(SmC_{A}^\ast)$ observed by dielectric spectroscopy, but the range of this phase is narrow of about 2°. All three compounds exhibit in the SmC* phase Goldstone mode and Maxwell-Wagner relaxation hidden in the conductivity contribution at low frequencies, whereas in the $SmC_{A}^\ast$ phase two anti-ferroelectric modes (AFM1) and (AFM2) contribute to the dielectric spectrum. The compounds were studied using differential scanning calorimetric, frequency domain dielectric spectroscopy, and reversal currents method to determine spontaneous polarization.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of anion in the effect of tetrabutylammonium salts on common radish seedlings: growth inhibition and oxidative stress
    Autorzy:
    Pawlowska, B.
    Telesinski, A.
    Wrobel, J.
    Biczak, R.
    Curylo, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/13755.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Źródło:
    Journal of Elementology; 2018, 23, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detekcja sakkad w sygnale ENG z użyciem grupowania rozmytego
    An application of fuzzy clustering for saccade detection in ENG signal
    Autorzy:
    Pander, T.
    Czabański, R.
    Wróbel, J.
    Horoba, K.
    Przybyła, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/98799.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    detekcja sakkad
    grupowanie rozmyte
    sygnał ENG
    oczopląs
    saccade detection
    fuzzy clustering
    ENG signal
    nystagmus
    Opis:
    Sygnał elektrynystagmograficzny (ENG) z oczopląsem ma postać fali o piłokształtnym kształcie składającym się z fazy wolnej oraz szybkiej. Faza szybka to ruch sakkadyczny gałki ocznej. Skuteczna i dokładna detekcja sakkad ma kluczowe znaczenie w określeniu charakteru oczopląsu. W celu prawidłowej detekcji położenia sakkad sygnał ENG jest filtrowany a maksima lokalne są wykrywane za pomocą rozmytej metody c-średnich. Proponowany algorytm charakteryzuje się dużą czułością i pozwala na automatyczną i precyzyjną lokalizację sakkad w sygnale ENG.
    The electronystagmography (ENG) signal corresponding to nystagmus has a form of a saw tooth waveform with fast components related to saccades. The accurate detection of saccades in ENG signal is the base for the further estimation of the nystagmus characteristic. The proposed algorithm is based on the proper filtering of the ENG signal providing a waveform with amplitude peaks corresponding the fast eyes rotation. The correct recognition of the local maxima of the signal is obtained by the means of fuzzy c-means clustering (FCM). The proposed algorithm is highly sensitive and allows for the automatic and precise localization of the saccades in ENG signal.
    Źródło:
    Aktualne Problemy Biomechaniki; 2013, 7; 137-142
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Mechanical Properties of High-Alloyed 23Cr-5Mn-2Ni-3Mo Cast Steel
    Mikrostruktura i właściwości mechaniczne wysokostopowego staliwa 23Cr-5Mn-2Ni-3Mo
    Autorzy:
    Kalandyk, B.
    Zapała, R.
    Kasińska, J.
    Wróbel, M.
    Balicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356347.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex stainless cast steels
    microstructure
    solution annealing
    mechanical properties
    staliwo typu duplex
    mikrostruktura
    roztwór do wyżarzania
    właściwości mechaniczne
    Opis:
    The article presents the microstructure and mechanical properties of cast duplex stainless steel type 23Cr-5Mn-2Ni-3Mo. It has been shown that the structure of the tested cast steel is composed of ferrite enriched in Cr, Mo and Si, and austenite enriched in Mn and Ni. In the initial state, at the interface, precipitates rich in Cr and Mo were present. A high carbon content (0.08%C) in this cast steel indicates that probably those were complex carbides of the M23C6 type and/or σ phase. Studies have proved that the solution annealing conducted at 1060°C was not sufficient for their full dissolution, while at the solutioning temperature of 1150°C, the structure of the tested material was composed of ferrite and austenite. Partial replacement of Ni by two other austenite-forming elements, which are Mn and N, has ensured obtaining mechanical properties comparable to cast duplex 24Cr-5Ni-3Mo steel of the second generation. Basing on the results of static tensile test, a twice higher yield strength was proved to be obtained, compared to the cast austenitic 18Cr-9Ni and 19Cr-11Ni-2Mo steel commonly used in the foundry industry. In addition to the high yield strength (YS = 547 ÷ 572 MPa), the tested cast steel was characterized by the following mechanical properties: UTS = 731 ÷ 750 MPa, EL = 21 ÷ 29.5%, R.A. = 43 ÷ 52%, hardness 256 ÷ 266 HB. Fractures formed in mechanical tests showed ductile-brittle character.
    W artykule przedstawiono mikrostrukturę i właściwości mechaniczne, kwasoodpornego staliwa ferrytyczno - austenitycznego 23Cr-5Mn-2Ni-3Mo typu duplex. Wykazano, że struktura badanego staliwa składa się z ferrytu δ wzbogaconego w C r, Mo i S i oraz austenitu wzbogaconego w Mn i Ni. W stanie wyjściowym na granicy międzyfazowej występują wydzielenia wzbogacone w C r i Mo. Wysoka zawartość C (0.08%) w tym staliwie wskazuje, że prawdopodobnie są to złożone węgliki M23C6 i/lub faza σ. Wykazano, że temperatura przesycania 1060°C nie jest wystarczająca do ich całkowitego rozpuszczenia. Natomiast w temperaturze przesycania 1150°C struktura badanego materiału składa się z ferrytu i austenitu. Częściowe zastąpienie Ni przez dwa inne pierwiastki austenitotwórcze jakimi są Mn i N zapewniło uzyskanie porównywalnych właściwości mechanicznych do staliwa duplex 24Cr-5Ni-3Mo drugiej generacji. Na podstawie przeprowadzonej statycznej próby rozciągania wykazano dwukrotnie wyższą granicę plastyczności w porównaniu do często stosowanego w przemyśle odlewniczym austenitycznego staliwa 18Cr-9Ni i 19Cr-11Ni-2Mo. Poza wysoką granicą plastyczności (Rp0,2 = 547 ÷ 572 MPa), badane staliwo charakteryzowało się następującymi właściwościami mechanicznymi: Rm = 731 ÷ 750 MPa, As = 21 ÷ 29,5%, Z = 43 ÷ 52%, HB = 256 ÷ 266. Przełomy po badaniach wytrzymałościowych wykazywały charakter ciagliwo-kruchy.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2529-2534
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Reorientation Studies in Nd$\text{}_{2}$Fe$\text{}_{14-x}$Si$\text{}_{x}$B (0
    Autorzy:
    Gargula, R.
    Pędziwiatr, A.
    Bogacz, B.
    Wróbel, S.
    Bartolomé, J.
    Stankiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030427.pdf
    Data publikacji:
    2002-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    76.80.+y
    64.60.-i
    Opis:
    Nd$\text{}_{2}$Fe$\text{}_{14-x}$Si$\text{}_{x}$B (x=0.25, 0.5, 0.75, 1.0, 1.5, 2.0) intermetallic compounds were investigated by magnetometry, $\text{}^{57}$Fe Mössbauer effect, electric resistivity, and differential scanning calorimetry mainly in the vicinity of the spin reorientation temperature, T$\text{}_{SR}$. The Curie temperature, T$\text{}_{C}$, and T$\text{}_{SR}$ were determined for different compositions and the spin phase diagram was constructed. $\text{}^{57}$Fe Mössbauer spectra showed noticeable changes in the reorientation region. For temperatures above the transition, the spectra were analysed using 6 Zeeman patterns associated with 6 inequivalent crystal sites in Nd$\text{}_{2}$Fe$\text{}_{14}$B according to site occupations (16k$\text{}_{1}$:16k$\text{}_{2}$:8j$\text{}_{1}$:8j$\text{}_{2}$:4c:4e). In the transition region, 12 subspectra had to be incorporated in the analysis. Electric resistivity measurements showed a typical metallic behaviour with no anomalies in the magnetic transition region. Differential scanning calorimetry measurements revealed broad endothermic two stage peaks around T$\text{}_{SR}$.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 2; 289-294
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projective filtering based on L1-norm PC
    Autorzy:
    Przybyła, T.
    Wróbel, J.
    Pander, T.
    Czabański, R.
    Jeżewski, J.
    Matonia, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332906.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    embedded space
    projective filtering
    nonlinear noise reduction
    PCA
    L1-norm PCA
    przestrzeń osadzona
    filtrowanie rzutowe
    nieliniowa redukcja szumów
    norma L1 PCA
    Opis:
    The paper presents a modification of nonlinear state-space projections (NSSP) method. The proposed approach deals with the sub-space estimation problem. In the original NSSP method, the principal component analysis (PCA) is used for the subspace determination. The classical PCA uses L2-norm. It is well known that the L2-norm is sensitive to outliers. Thus, in this paper the L1-norm PCA is proposed a subspace determination. In numerical experiments an analytic signal and real ECG signals are processed with the proposed method. The signals are contaminated with Gaussian distributed noise with different signal to noise ratio (SNR). Obtained results confirm the usefulness of the proposed modification.
    Źródło:
    Journal of Medical Informatics & Technologies; 2013, 22; 79-86
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data stream processing in fetal monitoring system: I. algebra and query language
    Autorzy:
    Widera, M.
    Jeżewski, J.
    Winiarczyk, R.
    Wróbel, J.
    Horoba, K.
    Gacek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/333189.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    język zapytań
    przetwarzanie strumienia danych
    system zarządzania bazami danych
    monitorowanie płodu
    query language
    data stream processing
    database management system
    fetal monitoring
    Opis:
    The paper presents the algebra and declarative query language developed for fetal monitoring system MONAKO. At present, the system architecture is centralised. Recording, analyzing and visualization of data are carrying out in the central unit. Therefore, the system cannot scale in a simple manner. Presented solution enables to define query based on data streams that makes the updated answers currently available. Applying database management system that carries out its tasks based on presented assumptions enables the construction of monitoring system of distributed architecture
    Źródło:
    Journal of Medical Informatics & Technologies; 2003, 5; MI83-90
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated carbons from molasses as CO₂ sorbents
    Autorzy:
    Młodzik, J.
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070546.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    Aim of this research is to obtain effective, molasses based activated carbon, which would adsorb big amounts of CO₂. Molasses was mixed with KOH. Weight ratio of dry materials was 1:1 (AC1, AC3) and 1:2 (only AC2). Homogeneous mixture was obtained. Material was left for 3 h at 25°C. Drying lasted for 12 h at 200°C, and the material was grounded. The mixture was pyrolysed at 750°C, under constant flow (18 dm³/min) of nitrogen. The material was grounded again. Then, powder was washed with water, until filtrate was neutral, which took about 5 dm³ of water. AC3 was washed with 1 dm³ of water. After drying, materials were soaked in HCl (0.1 mol/dm³) for 19 h, and washed with water, until filtrate was neutral. CO₂ adsorption was performed under high pressure up to 40 atm, at 40°C. Specific surface area (according to the Brunauer-Emmett-Teller equation) was calculated for AC1, AC2 and AC3 and it is respectively 1985, 1967, and 2026 m²/g, micropore volume - 0.714, 0.707, and 0.728 cm³/g and it was between 75% and 89% of total pore volume. The excess uptake at 40 atm pressure was as follows: AC1 - 14.02 mmol/g, AC2 - 12.75 mmol/g, and AC3 - 15.79 mmol/g.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 402-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integration test procedures for a collision avoidance decision support system using STPA
    Autorzy:
    Dugan, S.
    Skjetne, R.
    Wróbel, K.
    Montewka, J.
    Gil, M.
    Utne, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201452.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Opis:
    The transition from conventionally manned to autonomous ships is accompanied by the development of enhanced Decision Support Systems (DSS) for navigators. Such systems need to consider interactions among hardware, software, and humans and their potential effects on system performance, which require rigorous testing to verify the system's safe decision-making ability and operational limits. Testing requirements for verification are aimed at 1) assessing the system's reliability and failure handling performance, and 2) integration testing. This work uses the System-Theoretic Process Analysis (STPA) to develop integration tests for a novel DSS. STPA is a structured methodology to identify hazards from multiple sources, including hardware or software failures, system interactions, and human errors. The objectives of the study are to develop and assess the feasibility of integration test procedures based on STPA. The stability monitoring subsystem from the DSS is analyzed as a case study. The results are used to suggest functional and performance integration test procedures.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 375--381
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferroelectric Liquid Crystal for Use in a New Generation of LCDs
    Autorzy:
    Fitas, J.
    Marzec, M.
    Tykarska, M.
    Wróbel, S.
    Dąbrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399018.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Nh
    64.70.M-
    Opis:
    The key to improvements in liquid crystalline displays lies in the continuous synthesis and studies of new kinds of liquid crystalline substances. Among them, ferroelectric compounds are the subject of much attention, due to the potential progresses in switching time, colour depth, and other qualities of liquid crystal displays. In this paper we describe the research of the physical properties of 4-(2-methylbutoxy)phenyl 4-(octyloxy)-benzoate for purposes of its potential application in liquid crystal displays.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 954-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dodatkowa profilaktyka tąpaniowa z wykorzystaniem strzelań w warstwach stropowych - doświadczenia KGHM Polska Miedź S.A. O/ZG „Rudna
    Additional prevention against tremors with the use of blasting in roof layers - tests of KGHM Polska Miedź S.A. "Rudna" coal mine
    Autorzy:
    Anderko, A.
    Laskowski, M.
    Mirek, A.
    Osman, R.
    Wróbel, J
    Powiązania:
    https://bibliotekanauki.pl/articles/165113.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    geologia
    górnictwo
    eksploatacja złoża
    profilaktyka tąpaniowa
    geology
    mining
    deposit exploitation
    prevention against tremors
    Opis:
    Przedstawiono przypadki stosowania w KGHM Polska Miedź S.A. O/ZG „Rudna" strzelań w warstwach stropowych w ramach profilaktyki tąpaniowej w różnych uwarunkowaniach geologiczno-górniczych. Omówiono genezę, przebieg i efektywność odprężenia górotworu strzelaniem długimi otworami w warstwach stropowych na przykładzie pól eksploatacyjnych G-23/1, G-1/7, X/1, G-7/5 i G-11/8. W przypadku pól G-23/1 i G-1/7, z uwagi na rodzaj użytego MW i długość otworów strzałowych rzędu 60 m, konieczne było opracowanie przez służby kopalni wielu szczegółów technicznych dotyczących konstrukcji i sposobu ładowania MW oraz jego zabezpieczenia przed wypadnięciem z otworu.
    This paper presents the cases of using blasting in roof layers in the framework of prevention against tremors in different geological and mining conditions, performed in KGHM Polska Miedź S.A. "Rudna" coal mine. It describes the origin, course and efficiency of rock mass decompression thanks to blasting with long blast-holes in roof layers on the example of exploitation fields G-23/1, G-1/7, X/1, G-7/5 and G-11/8. In cases of fields G-23/1 and G-1/7, it was necessary to develop a series of technical details, concerning the structure and manner of loading the blasting material and securing it against falling down the hole, because of the type of the used blasting material and the length of blast-holes amounting to 60m.
    Źródło:
    Przegląd Górniczy; 2015, 71, 2; 1-9
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GaSb Dots Grown on GaAs Surface by Metalorganic Chemical Vapour Deposition
    Autorzy:
    Bożek, R.
    Babiński, A.
    Baranowski, J. M.
    Stępniewski, R.
    Klusek, Z.
    Olejniczak, W.
    Starowieyski, K.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934054.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    68.55.-a
    Opis:
    We report metaloorganic chemical vapour deposition growth of an anisotropic GaSb islands on GaAs (001) surface with a typical dimensions around 200 nm. Results of investigations employing scanning electron microscope, scanning tunnelling microscope and ph9tocapacitance are presented.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 974-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design challenges for home telemonitoring of pregnancy as a medical cyber-physical system
    Autorzy:
    Horoba, K.
    Jeżewski, J.
    Wróbel, J.
    Pawlak, A.
    Czabański, R.
    Porwik, P.
    Penkala, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/333007.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    pregnancy monitoring
    telemonitoring at home
    Medical Cyber Physical Systems
    monitorowanie ciąży
    telemonitoring w domu
    systemy medyczne
    Opis:
    The paper introduces the problem of designing a telemedical system for pregnancy monitoring at home. It focuses on design challenges concerning embedded computing and networking, requirements modelling, and presents the architecture and solutions when based on new class Medical Cyber-Physical Systems (MCPS). The proposed system consists of a Body Area Network (BAN) of advanced sensors that are interconnected on a body of a pregnant woman, a Personal Area Network (PAN) that is responsible for embedded processing of physical signals, smart alarms, data transmission and communication with the Surveillance Centre located in hospital. It is expected that this dependable telemedical system will provide a high societal value to women with high-risk pregnancy.
    Źródło:
    Journal of Medical Informatics & Technologies; 2014, 23; 59-66
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on tribological properties of dental composite materials
    Autorzy:
    Dziedzic, K.
    Zubrzycka-Wróbel, J.
    Józwik, J.
    Barszcz, M.
    Siwak, P.
    Chałas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/103005.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dental materials
    biotribology
    friction coefficient
    wear
    Opis:
    Dental practice today used a lot of different materials. This paper evaluates tribological and mechanical properties of two dental materials CeramX and I-Light. Tribological analysisad of samples was conducted at temperature 37°C and in the environment of artificial saliva. The wear rate was evaluated with a ball-on-disc tribotester, in accordance to ASTM G-133 norm. The counterbodies were 6-mm-in-diameter Al2 O3 steel balls. The load of 2, 10 and 20 N was applied. The tests were conducted at 0.15 m/s sliding velocity over a sliding stroke of 1000 m. The changes in the value of the following parameters were measured during the trials: friction coefficient, friction force, temperature and wear depth. After completing the tribological tests the surface of samples was carried out.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 32; 144-149
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission of vibrations from the engine to the car body
    Autorzy:
    Aleksieva, V.
    Valchanov, H.
    Magdziak-Tokłowicz, M.
    Wróbel, J.
    Włostowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/243558.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    LDV
    laser Doppler vibrometry
    car body
    car suspension
    Opis:
    Vibrations have become an important factor of vehicles. Vibration tests help identify, and then tune the automotive vehicle to improve the structural strength. Due to the increasing development of vehicles and machines and their widespread use. Increased research-using vibrations due to their low or zero interference with the vehicle under test. Vibration testing is often carried out using Laser Doppler Vibrometry (LDV), a device that is used for contactless measurement of vibration on the surface. The laser beam is directed from the device to the surface of interest, and the amplitude and frequency of vibration are extracted from the Doppler shift frequency of the reflected laser beam due to the movement surface. High values of vibration transmitted from the engine, and the way significantly affect the body of the vehicle and the driver. Article presents results of research carried out on vehicles powered by three different engines and rpm. Tests were carried out on an engine dynamometer in the same environmental conditions. Two of engines were with spark ignition, including one with a supercharged engine and compression ignition engine. The measurements were made using the Laser Doppler Vibrometry using Fast Fourier Transform. The spectrum obtained is used for further analysis to determine the acceleration level at various frequencies. Obtained from Fast Fourier Transform readings used for drawing graphs of frequency V acceleration. The results of the study are interesting and promising, as they show a significant difference in the velocity for spark ignition engines and compression-ignition.
    Źródło:
    Journal of KONES; 2016, 23, 4; 17-23
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of predictive capabilities of quantitative cardiotocographic signal features
    Autorzy:
    Czabański, R.
    Jeżewski, M.
    Roj, D.
    Szaszkowski, Z.
    Kupka, T.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332937.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    monitorowanie płodu
    tętno płodu
    klasyfikacja sygnału
    fetal monitoring
    fetal heart rate
    signal classification
    ROC analysis
    Opis:
    Cardiotocography (CTG) is the main method of assessment of the fetal state during pregnancy and labour used in clinical practice. It is based on quantitative analysis of fetal heart rate, fetal movements and uterine contractions signals. The evaluation of the CTG signals can be made using criteria recommended by International Federation of Obstetrics and Gynecology. Nevertheless, the diagnosis verification is possible only after the delivery on the basis of newborn assessment. In the proposed work we evaluated the capacity of quantitative analysis of CTG traces in predicting fetal outcome. The relationship between CTG signal features and attributes of fetal outcome was assessed on the basis of ROC curves analysis. The obtained results indicate the adequate predictive capabilities of the selected CTG features especially for fetal outcome assessed with Apgar score and suggest the necessity of applying the criteria for the CTG traces evaluation that are related to the gestational age. Our study also shows the value of the CTG monitoring as a screening procedure providing appropriate confirmation of fetal wellbeing.
    Źródło:
    Journal of Medical Informatics & Technologies; 2010, 16; 11-17
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smart selection of signal analysis algorithms for telecare of high-risk pregnancy
    Autorzy:
    Wróbel, J.
    Matonia, A.
    Horoba, K.
    Jeżewski, J.
    Czabański, R.
    Pawlak, A.
    Porwik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/333593.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    fetal monitoring
    abdominal fetal electrocardiogram
    smart signal processing
    telemedicine
    monitorowanie płodu
    brzuszne EKG płodu
    inteligentne przetwarzanie sygnałów
    telemedycyna
    Opis:
    Telemedical system for fetal home monitoring with smart selection of signal analysis algorithms is presented in this paper. Fetal monitoring signals are provided by a mobile instrumentation consisting of bioelectrical signal recorder and tablet PC which retrieves and processes the data as well as provides wireless data transmission based on Internet. The fetal surveillance system enables analysis, dynamic presentation and archiving of acquired signals and medical data. Novelty of the proposed approach relies on smart fitting of the algorithms for analysis of the abdominal signals in mobile instrumentation, as well as on controlling of the fetal monitoring session from the surveillance center. These actions are performed automatically through continuous analyzing of the signal quality and the reliability of the quantitative parameters determined for the acquired signals. Using that approach the amount and content of data transmitted through remote channels to the surveillance center can be controlled to ensure the most reliable assessment of the fetal well-being.
    Źródło:
    Journal of Medical Informatics & Technologies; 2014, 23; 27-33
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of automated detection of uterine contraction using tocography
    Autorzy:
    Horoba, K.
    Wrobel, J.
    Jezewski, J.
    Kupka, T.
    Czabanski, R.
    Roj, D.
    Jezewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/334025.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    uterine contractile activity
    tocography
    automated contraction detection
    aktywność skurczowa macicy
    tokografia
    automatyczne wykrywanie skurczu
    Opis:
    Monitoring of uterine contractile activity enables to control the progress of labour. Automated detection of contractions is to be an integral part of the signal analysis implemented in computer aided fetal surveillance system. Evaluation of efficiency of three algorithms for automated detection of uterine contractions in the signal of uterine mechanical activity is presented. These algorithms are based generally on analysis of the frequency distribution of signal values. The reference data in form of beginning and end of contraction episodes were obtained from human expert. Obtained results showed high efficiency of the algorithms tested where the best one ensured the sensitivity and positive predictive value equal to 92.2 and 97.2, respectively.
    Źródło:
    Journal of Medical Informatics & Technologies; 2015, 24; 207-214
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segmentation of biomedical signals using an unsupervised approach
    Autorzy:
    Przybyła, T.
    Wróbel, J.
    Czabański, R.
    Horoba, K.
    Pander, T.
    Momot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333275.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    atraktor
    przestrzeń jądra
    grupowanie rozmyte
    embedded space
    attractor
    PCA
    kernel space
    fuzzy clustering
    Opis:
    The paper presents an unsupervised approach to biomedical signal segmentation. The proposed segmentation process consists of several stages. In the first step, a state-space of the signal is reconstructed. In the next step, the dimension of the reconstructed state-space is reduced by projection into principal axes. The final step involves fuzzy clustering method. The clustering process is applied in the kernel-feature space. In the experimental part, the fetal heart rate (FHR) signal is used. The FHR baseline and the acceleration or deceleration patterns are the main signal nonstationarities but also the most clinically important signal features determined and interpreted in computer-aided analysis.
    Źródło:
    Journal of Medical Informatics & Technologies; 2012, 19; 125-131
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of activated carbon from beet molasses and TiO₂ as the adsorption of CO₂
    Autorzy:
    Glonek, K.
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075525.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    The objective of this work is to produce activated carbon from sugar beet molasses containing TiO₂ for CO₂ adsorption and reduction. Textural properties of activated carbons were obtained based on the adsorption-desorption isotherms of nitrogen at 77 K. The specific surface areas of activated carbons were calculated by the Brunauer-Emmett-Teller method. The volumes of micropores were obtained by density functional theory method. The adsorption isotherms of CO₂ were measured up to the pressure of 1 atm at a temperature of 40°C. The best activated carbon adsorbed 1.9 mmol/g of CO₂.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 158-161
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of commercial activated carbons for CO₂ adsorption
    Autorzy:
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel,A. Gęsikiewicz-Puchalska, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070602.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    The aim of the investigations was a modification of DTO, a commercial activated carbon (AC), to improve CO₂ adsorption capacity. The adsorption of CO₂ up to 40 bar at 40°C temperature was investigated. The volumetric method was applied for CO₂ adsorption isotherm measurements. The starting material - DTO - was modified using chemical activation (KOH, ZnCl₂, K₂CO₃). The textural parameters of all the ACs were determined by nitrogen adsorption at the liquid nitrogen temperature of -196°C on Quadrasorb SI. Results showed that the AC modified with KOH had the highest S_{BET}, V_{tot}, V_{mic} values of 2063 m²/g, 1.13 cm³/g, and 0.67 cm³/g, respectively. ACs with a wider pore size distribution (from micropores to mesopores) were obtained. The maximum CO₂ adsorption was equal to 14.44 mmol/g for DTO/KOH - modified carbon whereas 8.07 mmol/g of CO₂ was adsorbed at DTO. The CO₂ adsorption capacities of the ACs were found to be closely correlated with the BET surface areas of the materials tested. The experimental data was fitted to the Freundlich, Langmuir, Sips and Toth equations to determine the model isotherm. The Sips model was found to be the best for fitting the adsorption of CO₂.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 394-401
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of simulation-based training in neonatal cardiopulmonary resuscitation complicated by meconium aspiration syndrome
    Autorzy:
    Zych, B.
    Błaż, W.
    Muster, M.
    Kraśnianin, E.
    Wróbel, R.
    Kremska, A.
    Błajda, J.
    Raba, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087796.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Tematy:
    newborns
    simulation
    meconium aspiration syndrome
    cardiopulmonary resuscitation
    education
    midwives
    Opis:
    Background: The use of simulation-based training is strategic in training medical staff. Aim of the study: The aim of the study was to assess the knowledge and skills of performing neonatal CPR (cardiopulmonary resuscitation) complicated by the presence of meconium in the respiratory tract in two groups of midwives (trained in the traditional tutorial-based model vs simulation-based training) with an interactive neonatal manikin. Material and methods: The knowledge and practical skills assessment was conducted in two groups of midwives. The knowledge of the participants was assessed using both a written test consisting of 25 control questions (5 questions on meconium aspiration syndrome, 20 on neonatal CPR) and practical skills including 12 activities (1-initial, 9-proper, 2-final). The complex “success” indicator was determined based on the effects of patient resuscitation (15 minutes of the scenario), and the reference point for knowledge and skills was to obtain a minimum of 70% correct answers/activities performed, evaluated by three independent experts. Results: In the knowledge test, the respondents scored 17.93 ± 3.11 points out of 25 (71.7%). Practical skills for all respondents were 17.57 ± 2.49 points out of 21 (83.66%), with a tendency to obtain higher points in cleaning of the airways and stimulation of the newborn, and lower for ventilation and the use of an alternative method of intubation. Despite the similar level of practical skills in both groups, only a higher statistical tendency was observed in three out of nine instrumented “proper activities” in the simulation trained midwives. Conclusions: The scenario used by us assessing the knowledge and skills of midwives taught in traditional tutorial-based and simulation-based training, indicates the advantage of acquiring individual competences in a short time using simulation-based training. This increasingly popular scientific model allows the acquisition of “invasive” competencies, but it requires further research.
    Źródło:
    Medical Science Pulse; 2020, 14, 3; 25-30
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dimensional Crossovers in Magnetoresistance of Submicron Films and Wires of CdTe:In
    Autorzy:
    Jaroszyński, J.
    Wróbel, J.
    Sawicki, M.
    Skośkiewicz, T.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Dietl, T.
    Kamińska, E.
    Papis, E.
    Piotrowska, A.
    Duś, R.
    Nowakowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952536.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Jv
    Opis:
    We present millikelvin studies of magnetoresistance for epitaxial films and wires of CdTe:In. In comparison to the data with theoretical predictions for the weakly localized regime we put into the evidence the presence of the temperature-induced dimensional crossovers in the studied systems. Our measurements probe the electron phase-breaking rate and indicate that the main dephasing mechanism arises from electron scattering from thermal fluctuations of three- or two-dimensional electron liquid.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1027-1031
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ supersorbentu polimerowego na wybrane parametry biochemiczne w glebie i siewkach pszenicy ozimej (Tricticum aestivum L.)
    Effect of supersorbent polymer on some biochemical parameters in soil and seedlings of winter wheat (Tricticum aestivum L.)
    Autorzy:
    Snioszek, M.
    Platkowski, M.
    Strek, M.
    Mielczarek, M.
    Telesinski, A.
    Wrobel, J.
    Biczak, R.
    Pawlowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/800627.pdf
    Data publikacji:
    2016
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    Jednym ze sposobów częściowego zmniejszenia deficytu wody, szczególnie na glebach lekkich, może być zastosowanie supersorbentów polimerowych powodujących zwiększenie retencji wodnej i poprawiających strukturę gleby. Celem podjętych badań było określenie oddziaływania AgroHydroGelu na aktywność enzymów glebowych (dehydrogenaz i fosfataz), a także na wybrane parametry biochemiczne w siewkach pszenicy ozimej odmiany Skagen (aktywność katalazy i peroksydazy, zawartość polifenoli ogółem oraz zawartość barwników asymilacyjnych). Doświadczenie polowe założono na piasku gliniastym, do którego wprowadzono AgroHydroGel w ilościach odpowiadających dawkom sorbentu dla gleb o bardzo dużej przepuszczalności (1,19 g·kg⁻¹), dużej przepuszczalności (1,59 g·kg⁻¹) i średniej przepuszczalności (1,99 g·kg⁻¹). Na podstawie przeprowadzonych badań, stwierdzono istotne zmiany oznaczanych parametrów biochemicznych w glebie i siewkach pszenicy ozimej. Spośród oznaczanych enzymów glebowych największe zmiany wystąpiły w przypadku dehydrogenaz. Z kolei w siewkach pszenicy ozimej zaobserwowano głównie stymulację aktywności katalazy, inhibicję aktywności peroksydazy oraz wzrost zawartości barwników asymilacyjnych.
    Supersorbent polymer application may be a way to partial reduction of water deficit, especially in sandy soils. It causes an increase in water retention, at the same time improving soil structure. The aim of this study was to determine the impact of AgroHydroGel on the activity of soil enzymes (dehydrogenases and phosphatases), as well as on selected biochemical parameters in seedlings of winter wheat cv. Skagen (activity of catalase and peroxidase and content of total polyphenols and assimilation pigments). The pot experiment was carried out on soil material taken from the topsoil of Brunic Arenosol in Agricultural Experimental Station in Lipnik, located in the West Pomeranian District, Poland. According to the classification of the United States Department of Agriculture, it was soil with a granulometric composition of loamy sand, with Corg content of 8.7 g·kg⁻¹. AgroHydroGel was added to the soil samples in amounts appropriate to doses for soils of a very high permeability (1.19 g·kg⁻¹), high permeability (1.59 g·kg⁻¹) and medium permeability (1.99 g·kg⁻¹). A monocotyledonous plant, winter wheat (Triticum aestivum L.) cv. Skagen, was used in the experiment. Seeds of the plant, originating from the same source, were sown into a plastic plant pots that were filled with reference soil and soil thoroughly mixed with the studied supersorbent. Soil samples were collected on days 1, 7, 14, 21 and 28, and activities of acid phosphatase (EC 3.1.3.2), alkaline phosphatase (EC 3.1.3.1) and dehydrogenases (EC 1.1.1.x) were determined. Moreover, in winter wheat seedlings, analyses of catalase (EC 1.11.1.6), peroxidase (EC 1.11.1.7) activity and content of photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoids) were performed on days 14, 21 and 28. Obtained results showed significant changes in measured biochemical parameters in soil and the seedlings of winter wheat. Among soil enzymes the highest changes were observed in dehydrogenases activity. However, in the seedlings of winter wheat, a stimulation of catalase activity, inhibition of peroxidase activity and increase in assimilation pigments concentration were mainly reported. These results showed that application of AgroHydroGel may cause disturbances in soil ecochemical state and initiate oxidative stress in wheat seedlings.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 2016, 587
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy
    Autorzy:
    Wawrzyniak, A.
    Chruściel, J.
    Douali, R.
    Dubois, F.
    Leblond, J.
    Legrand, Ch.
    Ossowska-Chruściel, D.
    Marzec, M.
    Ropa, P.
    Czerwiec, J.
    Wróbel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399012.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Nh
    64.70.M-
    77.22.Gm
    77.22.Ej
    Opis:
    (S)-(+)-4'-[(4-(1-methylheptyloxycarbonylphenyl) thiocarbonylphenyl]-decyloxybenzoate (in short 10.OPOSMH) was studied by complementary methods. The substance shows rich polymorphism. In addition to ferroelectric and antiferroelectric smectic C* phases it possesses three ferrielectric sub-phases. Phase transitions between the phases were revealed by differential scanning calorimetry and static dielectric permittivity measurements. The aim of this paper was to study phase transitions and differences in dielectric spectra shown by different phases. Collective and molecular dynamics of all phases shown by 10.OPOSMH will be discussed in terms of theoretical models. Dielectric spectra of antiferroelectric phase show two characteristic dielectric relaxation modes: one connected with the molecular process (reorientation around the short axis) and the other originating from fluctuations of antiferroelectric order parameters.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 933-936
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Electrooptic Investigations of B Phases οf Banana-Shaped Thioesters
    Autorzy:
    Wierzejska-Adamowicz, M.
    Ossowska-Chruściel, D.
    Chruściel, J.
    Douali, R.
    Legrand, Ch.
    Marzec, M.
    Mikułko, A.
    Sikorska, A.
    Wróbel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538244.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Nh
    77.84.-s
    78.20.Jq
    Opis:
    Electrooptic and dielectric measurements were done for B phases of two banana-shaped homologues 1,3-phenylene bis{4-[(4-nonylo-xy-benzoyl)sulfanyl]benzoate (9OSOR) and 1,3-phenylene bis{4-[(4-dodecylo-xy-benzoyl)sulfanyl]benzoate (12OSOR). Polarizing microscopy allowed to identify $B_{1}$ phase for 9OSOR and $B_{2}$ phase for 12OSOR on the basis of texture observation. Spontaneous polarization measurements were performed using reversal current method. The current response to applied triangular voltage shows that $B_{1}$ phase is a ferroelectric and $B_{2}$ phase - antiferroelectric one for which two well separated peaks were observed. Polarization for phase $B_{1}$ of 9OSOR is rather small and its temperature dependence is unusual for ferroelectric liquid crystals - it increases with temperature. Spontaneous polarization for $B_{2}$ phase of 12OSOR compound is of about 600 nC/$cm^{2}$. Dielectric spectra measured with bias field for $B_{2}$ phase of 12OSOR show two well separated relaxation processes. In the low frequency range the relaxation process is connected with fluctuations of ferroelectric domains. The relaxation process in the high frequency range appearing also without bias field is connected with molecular reorientation. The dielectric spectra measured for $B_{1}$ phase of 9OSOR with and without bias voltage showed only one dielectric relaxation process connected with molecular reorientation around the short axis.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 557-561
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyznaczenie przemieszczeń powierzchniowych na osuwisku w Kłodnem (gmina Limanowa, południowa Polska)
    Determination of surface displacement on the landslide in Kłodne (Limanowa community, southern Poland)
    Autorzy:
    Ćwiąkała, P.
    Stanisz, J.
    Wróbel, A.
    Kaczmarczyk, R.
    Drwal, P.
    Grabek, P.
    Daroch, M.
    Pękala, M.
    Świątek, M.
    Zierkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075554.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Karpaty fliszowe
    osuwiska
    monitoring geodezyjny
    Kłodne
    flysch Carpathians
    landslides
    geodetic monitoring
    Opis:
    Examination of the landslide in Kłodne was carried out in 2013 and 2014. The work was divided into two parts: geological engineering investigations (mapping of the external borders of the landslide) and geodetic surveying (photogrammetric studies and monitoring of surface movements). The boundaries of the landslide were marked using a Garmin eTrex GPS receiver and a geological compass (Freiberg). The boundaries have not changed and is convergent with previous studies. In the south-western part of the landslide the boundary is blurred as a result of anthropogenic transformation of the area. In the south-eastern part (as at May17, 2014) about 200 m3 of the colluvial material has been moved. Photogrammetric studies were based on the analysis of aerial photos from May 26, 2009 (prior tothe landslide formation) and on the orthophotomap created from images taken in July 2010, after the formation of the landslide. Displacement vectors were determined by comparing the locations of specific terrain details in the pictures taken before and after the mass movements occurred. In the upper part of the landslide the maximum horizontal displacement value was 87.7 m, the minimum was 6.2, and the average – 84.5 m. In the lower part of the landslide the horizontal displacements amounted to 65.5 m, had a minimum value of 10.3, and an average of 54.8 m. In the last stage of the study the base measurement network was created. It consisted of 68 points stabilized in the ground. The measurements were performed using the static GNSS observations method and linear-angular measurements carried out with a precise total station. In 2013, horizontal displacements ranged from 1 to 8.1 mm, and vertical ones ranged from –9.8 to 13.5 mm. In 2014, there were displacements observed in the vicinity of the main slope. They were directed to the south. The horizontal displacement vector has reached values from 2 to 94 mm, and the vertical vector was from –63 to 16 mm.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 2; 122--130
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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