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    Wyświetlanie 1-12 z 12
    Tytuł:
    Zmodernizowane szafy aparatowe do lokomotywy ET22-2000
    Modernised cubicles for locomotive class ET22
    Autorzy:
    Brzozowski, R.
    Czechowski, P.
    Górecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/250758.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    lokomotywa ET22-2000
    szafa aparatowa do lokomotyw
    Zakład Bombardier Transportation (Obsługa Klienta) Polska
    Zakład Naprawczy Lokomotyw Elektrycznych S.A. Gliwice
    Opis:
    Modernizacja lokomotywy elektrycznej ET22, o numerze seryjnym 315, przeprowadzona w Zakładach Naprawczych Lokomotyw Elektrycznych S.A. w Gliwicach, obejmuje szeroki zakres zmian, między innymi wyposażenia elektrycznego, którego głównym dostawcą do wykonanej modernizacji jest Bombardier Transportation (Obsługa Klienta) Polska Sp. z o.o. w Łodzi.
    Źródło:
    TTS Technika Transportu Szynowego; 2004, 11, 12; 54-56
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data mining system for air quality monitoring networks
    Autorzy:
    Czechowski, P.
    Badyda, A.
    Majewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/204820.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air pollutants
    data quality analysis
    data mining
    estimation
    exploratory methods
    harmonic
    principal component analysis
    statistical tests outliers
    influential
    leverage observations
    analytical software system
    programming
    Eco Data Miner
    EDM
    Winsorized mean
    Cook
    Mahalanobis distance
    DFITS
    COVRATIO
    Opis:
    The use of quantitative methods, including stochastic and exploratory techniques in environmental studies does not seem to be sufficient in practical aspects. There is no comprehensive analytical system dedicated to this issue, as well as research regarding this subject. The aim of this study is to present the Eco Data Miner system, its idea, construction and implementation possibility to the existing environmental information systems. The methodological emphasis was placed on the one-dimensional data quality assessment issue in terms of using the proposed QAAH1 method - using harmonic model and robust estimators beside the classical tests of outlier values with their iterative expansions. The results received demonstrate both the complementarity of proposed classical methods solution as well as the fact that they allow for extending the range of applications significantly. The practical usefulness is also highly significant due to the high effectiveness and numerical efficiency as well as simplicity of using this new tool.
    Źródło:
    Archives of Environmental Protection; 2013, 39, 4; 123-147
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of air pollution on visibility in urban conditions. Warsaw case study
    Autorzy:
    Majewski, G.
    Czechowski, P O
    Badyda, A.
    Brandyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207001.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    visibility
    air pollution
    pollutants
    mathematical models
    nitrogen oxides
    sulfur dioxide
    urban conditions
    urban air pollution
    urban atmosphere
    particle matter (PM)
    przejrzystość powietrza
    zanieczyszczenie powietrza
    modele matematyczne
    tlenki azotu
    zanieczyszczenia
    dwutlenek siarki
    warunki miejskie
    pyły zawieszone
    Opis:
    The influence of air pollutants on visibility in Warsaw Agglomeration has been investigated. Following pollutants were considered: PM10, SO2, NO2 and O3, while meteorological parameters included: air temperatures (mean, minimum, maximum), solar radiation, relative air humidity, rainfall rates and wind speed. Initial analyses were performed with the use of principal component analysis (PCA). In next stages, the logistic regression (LR), the analysis of variance (ANOVA), one-way classification and a model path of generalized regression models (GRM) were applied. PCA analysis showed that in the cold season the visibility index depends on PM10, SO2, NO2 and the temperatures: T, Tmin, and Tmax. In the warm season, the index of visibility is mostly shaped by four elements: O3, T, Tmax and solar radiation. Logistic regression model indicated that in the warm season only two variables are significantly related to visibility: PM10 and relative humidity of air. Regularities in the cold season shown by the LR correspond with the conclusions from the PCA. Among meteorological conditions, the most important is air temperature, but only Tmax preserves the same direction of influence as the one pointed by the PCA model.
    Źródło:
    Environment Protection Engineering; 2014, 40, 2; 47-64
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the data set from a two-year observation of the ambient water-soluble ions bound to four particulate matter fractions in an urban background site in Southern Poland
    Autorzy:
    Rogula-Kozłowska, W.
    Majewski, G.
    Czechowski, P. O.
    Rogula-Kopiec, P
    Powiązania:
    https://bibliotekanauki.pl/articles/207331.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chemical composition
    inorganic ions
    PM2.5
    air
    precipitation
    atmosphere
    Southern Poland
    skład chemiczny
    powietrze
    paliwa stałe
    zanieczyszczenie
    Południe Polski
    Opis:
    Ten water-soluble ions (F–, Cl–, NO3–, PO43–, SO42–, Na+, NH4+, K+, Ca2+, Mg2+), distributed among four fractions of particulate matter, PM, were investigated in an urban background site. The PM was sampled twice a week during a two-year sampling period. Mass distribution among the PM fractions and ambient concentrations of the ten PM-bound ions in the heating and non-heating periods, the seasonal effects in the PM fraction-bound ion concentrations (generalized regression model), and the principal components of all the resulting sets of ambient concentrations (principal component analysis) were determined, discussed, and interpreted in the terms of source apportionment of PM emissions. The formation of secondary inorganic aerosol in transformations of gaseous precursors (e.g., SOx, NOx, NH3) appeared to be most probable and significant source of PM2.5, especially of its sub-fraction PM1–2.5, in the non-heating period. In the heating period, PM and PM2.5 bound water-soluble ions originated mainly from combustion of coal and other solid fuels, or waste. Coarse particles (PM2.5–10 and PM10–40) and some PM2.5–40-bound ions (e.g. Na+, K+, Mg2+) may come from re-suspension of mineral matter and road dust. In some part, coarse PM may consist of mineral and salt particles containing gaseous and semi-volatile compounds.
    Źródło:
    Environment Protection Engineering; 2017, 43, 1; 137-149
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena stężenia całkowitej rtęci gazowej (TGM) na terenie stacji tła regionalnego Granica-KPN (województwo mazowieckie, Polska) w latach 2010–2011
    Estimation of Total Gaseous Mercury (TGM) Concentration at the Regional Background Station in Granica-KPN (Mazovia Province, Poland), 2010–2011
    Autorzy:
    Majewski, G.
    Czechowski, P O
    Badyda, A.
    Kleniewska, M.
    Brandyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819012.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    rtęć gazowa
    Granica-KPN
    powietrze atmosferyczne
    atmospheric mercury
    mercury measurement
    atmospheric air
    Opis:
    The study presents measurement results of the concentration of total gaseous mercury (TGM) in the atmospheric air of 2010–2011 coming from the only measurement station in the Mazovia Province, the Granica-KPN station (λE 20°27'20" φN 52°◦17'09.088"). A series of measurement results of mercury concentration was used to estimate the model which identifies the influence of chosen measurement results, both imission and meteorological ones, on concentrations of gaseous mercury in the atmospheric air. Due to the number of measurements limited to 2 years, the study made an attempt to perform an initial evaluation of seasonal factors. The analyses used included: the Principal Component Analysis (PCA) and a path for the Generalised Regression Model (GRM). Average concentration of TGM in 2010–2011 amounted to 1.52 ng m-3 which is very close to the background values obtained in other European countries. Seasonal dependence of TGM concentration was observed; in the cold half-year the TGM concentration was higher compared to the summer season. The obtained results of identifying the PCA and GRM models enable presenting the following synthetic, final conclusions: The employed models of PCA and GRM show that key factors which shape mercury concentration are the following: suspended dust PM10, gaseous pollutants: SO2 and NO2, and meteorological parameters: air temperature, relative humidity of air and solar radiation intensity. The index of the phenomenon, i.e. the first principal component, identifies this relationship as the strongest and most significant, but it is worth noting that there occurs inversely proportional influence of air temperature and solar radiation intensity. The GRM model shows the occurrence of seasonality in monthly periods and in total as an interaction of the year and the months, which is further confirmed in the PCA model through “distribution” of the effect of specific factors over successive principal components. Ozone, for instance, is connected with the first three components to a different degree (-0.6 with Component 1, 0.3 with Component 2 and 0.62 with Component 3) and not with the first or only one of the components. The PCA model is a linear relationship within each component separately and the relationships, being orthogonal to each other, account for successive parts of the total variance. The variables: ozone, wind velocity and atmospheric pressure are not related to the index of the phenomenon, i.e. to the first component. They are related to next principal components, which may prove a strong irregularity of the relationships or the occurrence of seasonality. To build the model, the study used data from a period of two years: 2010 and 2011. It does not give a sufficient number of observations for stable identification of seasonality (at least 5 repetitive periods) and further correlations of factors, i.e. successive principal components. Those components may indicate not so much the absence of measurement correlations with mercury, but a non-linear character or a strong dependence on various seasonal influences, such as yearly, seasonal or monthly fluctuations.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 2; 1302-1317
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced External Counterpulsation in Patients with Advanced Ischemic Cardiomyopathy
    Autorzy:
    Przywara-Chowaniec, B.
    Gawlikowski, M.
    Kuczaj, A.
    Bachorz, M.
    Czechowski, P.
    Kowalski, P.
    Geodecki, M.
    Kawecki, D.
    Barańska, K.
    Paluch, M.
    Pluszczyk, M.
    Opara, M.
    Puzio, A.
    Nowalany-Kozielska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418031.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.63.Ec
    82.60.Fa
    Opis:
    A significant increase in the number of patients with heart failure of varied etiology has been observed in the recent years. Apart from pharmacological and surgical therapies, new, non-invasive assistance methods of cardiovascular system are still sought. One of them is external counterpulsation. Within this study, effectiveness of such a form of therapy has been examined in a group of 10 patients with an ischemic left ventricular systolic dysfunction. It has been shown that external counterpulsation has a beneficial influence onto the result of a six-minute walk test and causes a slight decrease in the creatinine concentration in the patients undergoing the tests.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 866-869
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of small river deltas : the dependence of morphology on grain size and discharge
    Autorzy:
    Witek, P.
    Czechowski, L.
    Misiura, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060519.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    hydrology
    sedimentology
    river deltas
    numerical modelling
    Opis:
    We studied the dependence of the morphology of small river deltas on the grain size, the total discharge, and the slope of the deposits. We use Computational Fluid Dynamics (CFD) methods of numerical modelling. For all models we used the same initial geometry of the river valley and a portion of the lake. Our simulations show the expected dependence of the shape of our simulated small deltas on the grain size. Moreover, we find that the final type of delta could be characterized by the average slope in the region close to the delta front.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 975--980
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The formation of single-channel and multiple-channel rivers on large slopes
    Autorzy:
    Misiura, K.
    Czechowski, L.
    Witek, P.
    Bendiukova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060527.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    river classification
    multiple channel rivers
    single channel river
    sedimentation
    Opis:
    We investigated the formation of different types of rivers depending on slope, total discharge, and grain size. Calculations were performed using numerical package CCHE2D, developed by the National Center for Computational Hydroscience and Engineering. The model is based on the Navier-Stokes equations for depth-integrated two-dimensional turbulent flow and the three-dimensional convection-diffusion equation of sediment transport. For each model we use the same river geometry, suspended load concentration, and bedload transport rate. We distinguish three types of rivers using two methods for classification (single-channel, multiple-channels and transitional). We found that the trend line for transitional rivers is an increasing function of Q in space (Q, d) and that for large S the number of multichannel rivers decreases.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 981--989
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrocarbons in the Upper Permian PZ1– PZ2 cycles of the Kłodawa Salt Structure, central Poland
    Autorzy:
    Wolny, Ł.
    Czechowski, F
    Burliga, S.
    Raczyński, P.
    Hojniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191617.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Zechstein Basin
    Kłodawa Salt Structure
    PZ1–PZ2 rocks
    hydrocarbons
    biomarkers
    maturity
    hydrocarbons migration
    Opis:
    Organic geochemical studies were carried out on the sulphate–shale–carbonate series, representing the upper PZ1 and lower PZ2 sections of the Zechstein cycles in the Kłodawa Salt Structure, located in the central part of the Zechstein Basin, in Poland. Hydrocarbons extracted from the Na1 and Na2 rock salts, the A1g and A2 anhydrites, the Ca2 dolomitic anhydrite and the T2 shale-carbonate rocks were analysed by gas chromatography mass spectrometry (GC-MS). Homological series of the n-alkanes and chained isoprenes indicate the algal nature of the organic matter with the characteristic chemiistry of type II kerogen deposited under anoxic conditions. The molecular composition of other biomarkers (n-alkylbenzenes, steranes) as well as phenenthrene and dibenzothiophene and their methyl derivatives revealed the highest maturity of the hydrocarbons (level of advanced stage of the oil-window zone) in the upper part of the Stinking Shale. In the adjacent beds, a gradual decrease in the maturity of the hydrocarbons was observed both upwards and downwards in the stratigraphic sequence. The main source rock of the hydrocarbons is represented by the Stinking Shale deposits. The observed trend of vertical variation in maturity through the rock profile is explained as resulting from the continuous vertical migration of hydrocarbons, expelled during maturation from the Stinking Shale rocks into the underlying and overlying strata.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2014, 84, 4; 363-374
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Magnetic Fredericksz Transition in Ferronematics
    Autorzy:
    Kopčanský, P.
    Koneracká, M.
    Jadżyn, J.
    Czechowski, G.
    Żywucki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964799.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Md
    61.30.Gd
    Opis:
    The magnetic Fredericksz transition in ferronematics (thermotropic nematic liquid crystals 7CB and MBBA combined with fine magnetic particles of a size 10 nm) as a function of concentration of magnetic particles was studied by using simple dielectric measurements. The increase of the threshold magnetic field is observed in 7CB based ferronematic while the decrease of threshold field in MBBA based ferronematic is observed when the concentration of magnetic particles is increased. Experimental results are discussed in the framework of Brochard, de Gennes and Burylov, Raikher theories.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 437-440
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Indicators Of Burnished Surface Evaluation – Reasons Of Application
    Autorzy:
    Toboła, D.
    Rusek, P.
    Czechowski, K.
    Miller, T.
    Duda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/221546.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface geometrical structure
    slide diamond burnishing
    correlation analysis
    discrete Fourier transform
    Opis:
    Modern production technology requires new ways of surface examination and a special kind of surface profile parameters. Industrial quality inspection needs to be fast, reliable and inexpensive. In this paper it is shown how stochastic surface examination and its proper parameters could be a solution for many industrial problems not necessarily related with smoothing out a manufactured surface. Burnishing is a modern technology widely used in aircraft and automotive industries to the products as well as to process tools. It gives to the machined surface high smoothness, and good fatigue and wear resistance. Every burnished material behaves in a different manner. Process conditions strongly influence the final properties of any specific product. Optimum burnishing conditions should be preserved for any manufactured product. In this paper we deal with samples made of conventional tool steel – Sverker 21 (X153CrMoV12) and powder metallurgy (P/M) tool steel – Vanadis 6. Complete investigations of product properties are impossible to perform (because of constraints related to their cost, time, or lack of suitable equipment). Looking for a global, all-embracing quality indicator it was found that the correlation function and the frequency analysis of burnished surface give useful information for controlling the manufacturing process and evaluating the product quality. We propose three new indicators of burnishing surface quality. Their properties and usefulness are verified with the laboratory measurement of material samples made of the two mentioned kinds of tool steel.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 2; 263-274
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numeryczna analiza procesu hartowania w piecu rurowym z zimną komorą chłodzenia
    Numerical analysis of the quenching process in the tubular furnace with cold cooling chamber
    Autorzy:
    Pokrzywa, M.
    Niewiedzielski, R.
    Kula, P.
    Atraszkiewicz, R.
    Lipa, S.
    Czechowski, L.
    Jankowski, J.
    Wajman, T.
    Sobczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/395248.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    analiza numeryczna
    modelowanie
    obróbka cieplna
    hartowanie
    numerical analysis
    modeling
    heat treatment
    hardening
    Opis:
    W artykule przedstawiono zagadnienie wymiany ciepła pomiędzy stalowym wsadem poddanym uprzednio obróbce cieplno-chemicznej (nawęglanie próżniowe) a przepływającym gazem pod wysokim ciśnieniem. Problem naukowy rozwiązano wykorzystując stworzony w środowisku Delphi, specjalnie dla tego typu zagadnień, zewnętrzny program nadrzędny, umożliwiający połączenie oprogramowania opartego na metodzie objętości skończonej - ANSYS CFX 12.0 i metodzie elementów skończonych - ANSYS 12.0. Do programu zaimplementowane zostały dwa modele: przepływowy i termiczny. Stworzony program pozwala na analizę tempa chłodzenia w każdym punkcie objętości i optymalizację procesu chłodzenia z intensywnie i turbulentnie przepływającym gazem. Dla poprawnego zdefiniowania i modelowania zjawiska wymiany ciepła pomiędzy wsadem a medium chłodzącym stworzono bazę danych materiałowych, obejmującą wielkości fizyczne pozwalające stworzyć model numeryczny uwzględniający przemiany fazowe z tzw. ciepłem utajonym oraz wpływ szybkości chłodzenia na zmiany zachodzące w strukturze detalu. Przy tworzeniu baz materiałowych posłużono się programem JMatPro.
    The following work presents the issue of heat transfer between the steel charge after vacuum carburizing process and gas which intensively flows through. The external managing program has been created in Delphi environment to solve the scientific research problem, which connect the Finite Volume Method - ANSYS CFX 12.0 with Finite Element Method - ANSYS 12.0. To the program there were implemented two models: flow and thermal. Created program allows to analyze cooling rate at each point of the volume and optimize the cooling process with gas intensively and turbulently flowing through. For the correct definition and modeling of the phenomenon of the heat transfer between the steel charge and cooling gas, the database of material properties was created, which includes physical quantities that allow to create a numerical model taking into account the so-called phase transitions with latent heat and the influence of the cooling rate to changes in the structure of the detail. Thanks to JMatPro4 program, the application of different material properties database of material properties could be applied.
    Źródło:
    Postępy Nauki i Techniki; 2011, 8; 59-67
    2080-4075
    Pojawia się w:
    Postępy Nauki i Techniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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