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    Wyświetlanie 1-8 z 8
    Tytuł:
    Simple tank-to-wheels analysis tool for future vehicle powertrains
    Autorzy:
    Vavra, J.
    Macek, J.
    Takats, M.
    Cerovsky, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/243520.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    vehicle powertrain efficiency
    internal combustion engine
    fuel cells
    simulation
    driving cycle
    Opis:
    The future powertrains have to be properly assessed in early stages of vehicle design using simple and fast but reliable tools. The aim of the paper is to develop a simulation tool suitable for any of current transient cycles for finding of upper limits of tank-to-wheel efficiencies of recent or future vehicle powertrains in different concepts of vehicles to assess their potential, to find gaps between the state-of-the-art and to find ways to bridge them. The simulation philosophy and procedure may be described in the following steps. The testing cycle power demands on vehicle movement are analyzed and the optimum operation efficiency of a primary mover (engine, fuel cell, electric motor) is assigned to them. Dynamic torques at powertrain are accounted for. Speed, speed slip (driving machine/wheels) and load dependencies of transmission efficiency are simulated by simple models. In the case of a hybrid solution, charging and discharging efficiencies of energy accumulators and additional losses (e.g., in converters and inverters) are considered. The clear modular structure of the simulation tool enables the researcher to amend new features of powertrain components. The links to more detailed simulation tools are prepared. The simulation tool is described by regression and algebraic models (based on the results of higher level simulation tools) in a way giving immediate response during sensitivity analysis. The examples of tool calibration for different powertrains and results comparing powertrain potential are presented for lower medium class passenger car. The current simulation tool creates a useful link between detailed and accurate but CPU time demanding 1-D tools, based on partial differential equations, and rules-of-thumb, used sometimes for initial potential assessments. Moreover, the described tool does not require detailed data on the powertrain during early stage of design but it shows its potential for further development.
    Źródło:
    Journal of KONES; 2008, 15, 3; 525-534
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane zagadnienia w diagnostyce silników indukcyjnych
    Autorzy:
    Hickiewicz, J.
    Macek-Kamińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/156050.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    silniki elektryczne
    modelowanie i symulacja stanów dynamicznych
    diagnostyka silników indukcyjnych
    pomiary eksploatacyjne
    electric motors
    modeling and simulation of dynamic states
    diagnostics of induction motors
    operating diagnostic measurements
    Opis:
    Omówiono jakim badaniom winno się poddawać silniki indukcyjne w napędach elektrownianych. Szczególną uwagę zwrócono na silniki WN klatkowe w napędach potrzeb własnych. Przedstawiono potrzebę badań symulacyjnych i warunki jakie muszą być spełnione aby ich wyniki były wiarygodne. Zwrócono uwagę na eksploatacyjne pomiary diagnostyczne pozwalające na ocenę stanu silników i przydatność do dalszej pracy. Pokazano możliwości jakie w tym zakresie stwarzają: badania stanu izolacji napięciem stałym, badania stanu konstrukcji mechanicznej stojana pobudzeniem przez impuls elektromagnetyczny.
    The paper presents selected diagnostic tests which will be performed on induction motors used in electric drives in power plants[1, 2, 3]. In dynamic states, such as start-up, re-connection, etc., a rapid increase in the current and electromagnetic internal forces acting in the motor can occur. The dynamic states can cause a damage of the machine. There are proposed some dynamic simulation studies of electric drives as a method of diagnosing the causes of damage. The mathematical model of the induction machine (Section 2) [4, 5] [7, 8] is presented. There is also cited, previously developed by one of the authors [6], the method for determining the electromagnetic parameters of the model. In order to show the usefulness of the method, a comparison of measurements and calculations of some examples of dynamic processes is performed (Fig. 2). It concerns the energy-efficient induction motors [9] (Section 3). An example of comparison of the stator currents of energy-efficient motors obtained from simulating the dynamics of their start-up is presented in Fig. 5. It was noted that the damage of the rotor cage (Section 4) after improving the design of cages [10] and simplifying the methods for diagnosing the state of frames [11] [14] ceased to be a frequent cause of the induction motor damages. Measurements of the insulation state by constant voltage excitation, introduced by T. Glinka [12, 13] and widely used in power industry [14], are discussed in Section 5 (Fig. 6). The ways of estimating the insulation state are presented in [14, 15]. The usefulness of this method was proved on the motors activated after the flood [16]. The methods for testing the winding insulation are listed [17, 18, 19, 20]. The possibility of diagnosing the state of mechanical structures (housing, fixing, packages, etc.) by the method of stimulating with an electromagnetic pulse is also shown (Section 6). [14, 21].In the conclusions (Section 7) the necessity of dynamic simulation testing to verify the correctness of the selection of engines and to forecast the damages of engines is emphasized. The method for testing the winding insulation and the diagnosing of the state of mechanical structures by an electromagnetic pulse are assumed to be the ones of the future and development. The problem of diagnosing rolling bearing is not taken into consideration in the paper.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 71-75
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insights on Short-term Blooms of Planktonic Ciliates, Provided by an Easily Recognised Genus: Cyrtostrombidium
    Autorzy:
    Bulit, Celia
    Macek, Miroslav
    Montagnes, David J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/763531.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Bloom, conjugation, parasitism, patch, population dynamics, lagoon
    Opis:
    Planktonic ciliates occasionally form brief rapid increases in numbers (blooms) that can be trophically important. Although model simulations and mesocosm studies indicate that blooms occur over 10 to 20 days, field data are rarely suffi ciently detailed to reveal their occurrence and demise. Our data (collected over 57 weeks across a coastal lagoon) offer insights into the population dynamics of a single species, place these in the context of the entire ciliate assemblage, and provide guidance on what should continue to be examined. Specifically, to evaluate population dynamics we examine two species of Cyrtostrombidium, characterise temporal and spatial variation of their abundance, and relate these to abiotic phenomena and biological factors. This is also the first report of Cyrtostrombidium in a tropical coastal lagoon. Collectively our analysis reveals key aspects of the dynamics of this genus: 1) small-scale peaks in abundance are ~30 m in size and can persist for ~10–30 days, reaching a maximum of 100 cells ml–1; 2) these increases are driven by biotic factors (revealed through autocorrelation analysis); 3) long-term trends are driven by the shift between dry and rainy seasons and by the periods of isolation of lagoon from the sea (revealed through multiple regression analysis); 4) blooms may at times control primary production; 5) conjugation, an ecologically important event, may be associated with blooms (at times 9% of population was conjugating); and 6) dinoflagellate parasitism, poorly described in oligotrichs, is potentially important in population demise. These results both reflect on how ciliates may behave in short-term events and should encourage the continued need for detailed observations of field samples at a high taxonomic resolution.
    Źródło:
    Acta Protozoologica; 2013, 52, 1
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silniki indukcyjne klatkowe o podwyższonej sprawności w elektrowniach
    High-efficiency induction squirrel-cage motors in power plants
    Autorzy:
    Herman, W.
    Hickiewicz, J.
    Kamiński, M.
    Macek-Kamińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2076307.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silniki indukcyjne
    silniki klatkowe
    sprawność silnika
    elektrownia
    Opis:
    This short document describes the possibility of replacing standard electrical motors with high-efficiency models in power plants. Two different drives - the coal mill and the primary air fan - are presented. In both of them the replacement of the standard motors with their energy-saving counterparts is considered. The economic assessment of this replacement is included. The paper also compares these two types of electrical motors with two different drives options, taking into account their dynamic and usage qualities.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2005, 73; 31-35
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie silników o dużej sprawności do napędów wentylatorów młynowych
    The application of high-efficiency motors for fans mill drives
    Autorzy:
    Badowski, G.
    Hickiewicz, J.
    Macek-Kamińska, K.
    Kamiński, M.
    Pluta, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372848.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik elektryczny
    energooszczędność
    efektywność ekonomiczna
    sprawność
    modernizacja napędów elektrycznych
    napęd wentylatora
    Opis:
    The paper describes the possibility of using high-efficiency motors to fans mill drives. Criteria for economic analysis of replacing standard motors by energy-saving ones are quoted. The results of this analysis are presented. Mathematical models of induction motors for dynamic tests are briefly described. Simulation and measurement results of start-up for standard and energy-saving motors used in fans mill drives are given. Advisability of such a replacement is presented in the paper conclusion.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2010, 88; 135-140
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pośredni pomiar elektromagnetycznego momentu silnika indukcyjnego
    Indirect measurement of electromagnetic induction motor torque
    Autorzy:
    Badowski, G.
    Hickiewicz, J.
    Macek-Kamińska, K.
    Kamiński, M.
    Herman, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373123.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik indukcyjny
    maszyna elektryczna
    moment elektromagnetyczny
    pomiary
    Opis:
    The principle assign of slow variable induction motor torque based on power measurement taken by motor was briefly presented in the paper. Sample waveforms of motor load torque received of based on registered waveform input power were shown. It seems that in case of high-power driver, which continuously registration electrical quantity such as power or current input is currently often applying, registration of slow variable load torque can be comfortable to assessment of motor work.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2010, 86; 109-112
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Dispersion Method on the Microstructure and Properties of MWCNTs/AA6061 Composites
    Autorzy:
    Dobrzański, L. A.
    Macek, M.
    Tomiczek, B.
    Nuckowski, P. M.
    Nowak, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352262.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanocomposites
    powder metallurgy
    mechanical milling
    carbon nanotubes
    aluminium alloys
    Opis:
    The aim of this work was to study the effect of different methods of multi-walled carbon nanotubes (MWCNTs) dispersion, and their influence on the microstructure and properties of aluminium alloy matrix composites produced using the powder metallurgy techniques, such as powder milling/mixing and hot extrusion. The main problem in the manufacturing of nanocomposites is the homogeneous distribution of MWCNTs in the metal matrix. To achieve their proper distribution a high-energy and low-energy mechanical milling, using a planetary ball mill, and mixing, using a turbulent mixer, were applied. Studies have shown that composite materials prepared using milling and extrusion have a much better dispersion of the reinforcing phase, which leads to better mechanical properties of the obtained rods. The low-energy mechanical mixing and mixing using the turbulent mixer neither change the powder morphology nor lead to adequate dispersion of the carbon nanotubes, which directly affects the resulting properties.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1229-1234
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in survival of colorectal cancer patients in Swietokrzyskie Province (Southern Poland) from the second half of the 1990s to the early 21st century - a population-based study
    Autorzy:
    Macek, P.
    Biskup, M.
    Ciepiela, P.
    Terek-Derszniak, M.
    Sosnowska-Pasiarska, B.
    Król, H.
    Smok-Kalwat, J.
    Góźdź, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085547.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    colorectal cancer
    relative survival
    population-based registries
    Opis:
    Introduction and objectives. For years, the increase in cancer incidence and deaths has constituted a significant health and social problem. Variation in the burden in cancers in different regions of the world requires constant monitoring of the epidemiological situation in this regard. Assessing survival in cancer patients is a valuable source of information for patients and physicians alike, as well as for politicians who have a direct impact on the shaping of health policy and health systems. The aim of the present study was to assess the changes in the 5-year relative survival of colorectal cancer patients during 1995–2014. Materials and method. The data of 8,970 patients with colorectal cancer in the years 1995–2014, 5,033 males and 3,937 females aged 67.5 ± 11.7 from Świętokrzyskie Cancer Registry were used. Cases were classified according to the topographical codes ICD-O-3: C18.0-C18.9, C19.9, C20.9, C21.0-C21.2, C21.8. The end of follow-up was fixed at 31 December 2014. Four five-year calendar periods were defined. In each calendar period, relative survival rates using the Ederer II method were estimated separately for males and females. Results. In 2010–2014 (against 1995–1999), the absolute increase in the 5-year relative survival in males and females with colon cancer was the highest and reached 9.8 percentage point (p.p.) and 9.6 p.p., respectively. Patterns of survival for both colon and rectal cancer patients according to gender and age were very similar. Conclusions. In 1995–2014, an increase in the value of relative survival rates of males and females with colorectal cancer was observed. Systematic increase in funding in health care was a chance for reducing the burden of colorectal cancer by more widespread and equal access of effective early detection and cancer treatment.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 301-305
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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