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Wyszukujesz frazę "Wiśniowski, Piotr" wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    The profitability of disposing of vehicles fulfilling the older euro standards in terms of CO2 emission
    Autorzy:
    Menes, Maciej
    Wiśniowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/243693.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    CO2 emission
    exhaust gasses
    cars
    engines
    Opis:
    The automotive market is developing very dynamically. In recent years, we can observe activities of automotive concerns in the production of new models of electric, hybrid and hydrogen vehicles, and conventional cars are supplied with increasingly economical and low-emission engines. There are also increasingly stringent standards related to exhaust emissions from the exhaust system. From September 1, 2018, passenger cars have to comply with the Euro 6d-Temp emission standard and be homologated according to the WLTP test procedure including the WLTC driving cycle and emission measurements in road traffic conditions. The exhaust components measured during the test, such as carbon oxides, nitrogen oxides or hydrocarbons, are toxic to living organisms. However, it seems that the most important issue in the long term may be the value of carbon dioxide emissions, the excess of which poses an ecological threat to the entire planet. The production of new vehicles equipped with modern complicated combustion engines, batteries, fuel cells and electronic devices is associated with a very high emission of this greenhouse gas The authors of the following article, based on their own research, sought to estimate the ecological profitability of replacing a used passenger car meeting the Euro-4 emissions standard for a new vehicle bearing in mind the value of carbon dioxide emissions during vehicle production. The analysis was to indicate how intensive the annual operation of the vehicle should be to make it profitable to recycle and replace it with a modern car with lower emissions considering the global sum of carbon dioxide emissions.
    Źródło:
    Journal of KONES; 2019, 26, 1; 89-94
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Representativeness of emissions of toxic substances in bench tests reflecting the road traffic conditions of a vehicle
    Autorzy:
    Wiśniowski, Piotr
    Gis, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/133793.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    driving cycle
    road tests
    emission of toxic substances
    chassis dynamometer
    synthesis of road tests
    cykl jezdny
    badania drogowe
    emisja substancji toksycznych
    hamownia podwoziowa
    synteza testów jezdnych
    Opis:
    The results of measurements of exhaust emissions in real road traffic differ significantly from the results of stationary homologation tests. One of the solutions, helpful in determining the actual emission, is the creation of stationary exhaust emission tests simulating the use of the vehicle on the road. The article presents the method of reconstructing the synthetic driving test obtained on the basis of road tests and presents the obtained profile of the speed course. The authors discussed the reasonableness of selecting the emission component determining the correctness of the representativity of the stationary test obtained, which determines the amount of work done by the engine.
    Źródło:
    Combustion Engines; 2019, 58, 2; 88-90
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekologiczne aspekty zasilania silników gazowym paliwem LPG
    Ecological aspects of replacing the engines with gas LPG
    Autorzy:
    Gis, Maciej
    Wiśniowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1385317.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Wydawnictwo Ekonomiczne
    Tematy:
    emisja CO2
    instalacja LPG
    hamownia podwoziowa
    cykl jezdny
    NEDC
    CO2 emission
    LPG
    chassis dynamometer
    driving cycle
    Opis:
    Obniżenie emisji CO2 stanowi wyzwanie dla Europy i Świata. Krytyczną wartością jest wzrost średniej temperatury o 1,5 st. C. Transport jest odpowiedzialny za 20–25% emisji dwutlenku węgla. W Polsce znaczącą grupę pojazdów stanowią pojazdy z silnikami zasilanymi dwupaliwowo (benzyna + LPG). Autorzy referatu skupili się na problemie emisji dwutlenku węgla z pojazdów osobowych, których silniki zasilane były gazowym paliwem LPG.
    Reducing CO2 emissions is a challenge for Europe and the world. The critical value is an increase in the average temperature of 1.5 deg. C. Transport is responsible for 20-25% of carbon dioxide emissions. In Poland, a significant group of vehicles has dual fuel engines (petrol + LPG). The paper's authors focused on the issue of carbon dioxide emissions from passenger vehicles whose engines were powered by LPG gas.
    Źródło:
    Gospodarka Materiałowa i Logistyka; 2019, 5; 197-206
    1231-2037
    Pojawia się w:
    Gospodarka Materiałowa i Logistyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of road traffic conditions on a chassis dynamometer
    Autorzy:
    Wiśniowski, Piotr
    Ślęzak, Marcin
    Niewczas, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1363316.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    drive test
    exhaust emission
    road tests
    chassis dynamometer
    Opis:
    The article presents and compares the results of exhaust emission tests in conditions of real vehicle traffic with the results obtained during bench tests on a chassis dynamometer in conditions of road traffic simulation. A series of tests were carried out using a mobile exhaust analyzer and a vehicle speed recorder. The research route was designated in the center of a large urban agglomeration. Laboratory tests were designed according to an algorithm approximating the actual driving sections, and when choosing their order during the test construction, a random factor was introduced. The presented approach reflects the random nature of road traffic while ensuring the representativeness of toxic emissions from the vehicle's exhaust system. The results of measurements of carbon dioxide emission, carbon monoxide, nitrogen oxides and hydrocarbons registered in road and stationary, laboratory emissin tests were compared. Substantial agreement was found between the tests. Difficulties and differences in results due to research problems have also been described.
    Źródło:
    Archiwum Motoryzacji; 2019, 84, 2; 171-178
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An attempt to reduce the emission of spark-ignition engine with mixtures of bioethanol and gasoline as substitute fuels
    Autorzy:
    Gis, Wojciech
    Gis, Maciej
    Wiśniowski, Piotr
    Bednarski, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/247883.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    simulation
    combustion engines
    air pollution
    environmental protection
    Opis:
    Limiting emissions of harmful substances is a key task for vehicle manufacturers. Excessive emissions have a negative impact not only on the environment, but also on human life. A significant problem is the emission of nitrogen oxides as well as solid particles, in particular those up to a diameter of 2.5 microns. Carbon dioxide emissions are also a problem. Therefore, work is underway on the use of alternative fuels to power the vehicle engines. The importance of alternative fuels applies to spark ignition engines. The authors of the article have done simulation tests of the Renault K4M 1.6 16v traction engine for emissions for fuels with a volumetric concentration of bioethanol from 10 to 85 percent. The analysis was carried out for mixtures as substitute fuels – without doing any structural changes in the engine's crankshafts. Emission of carbon monoxide, carbon dioxide, hydrocarbons, oxygen at full throttle for selected rotational speeds as well as selected engine performance parameters such as maximum power, torque, hourly and unit fuel consumption were determined. On the basis of the simulation tests performed, the reasonableness of using the tested alternative fuels was determined on the example of the drive unit without affecting its constructions, in terms of e.g. issue. Maximum power, torque, and fuel consumption have also been examined and compared. Thus, the impact of alternative fuels will be determined not only in terms of emissions, but also in terms of impact on the parameters of the power unit.
    Źródło:
    Journal of KONES; 2019, 26, 3; 31-38
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative tests of a passenger car with compression ignition engine on chassis dynamometer during NEDC and WLTC tests and during RDE road test
    Autorzy:
    Gis, Wojciech
    Gis, Maciej
    Wiśniowski, Piotr
    Bednarski, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/134170.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    emissions
    pollutant emissions
    particle matter
    NEDC
    WLTP
    RDE
    emisje
    emisje zanieczyszczeń
    emisja zanieczyszczeń
    cząstki stałe
    Opis:
    Air pollution is a challenge for municipal authorities. Increased emission of PM10 and PM2.5 particles is particularly noticeable in Poland primarily the autumn and winter period. That is due to the start of the heating season. According to the above data, road transport accounted for approximately 5% of the creation of PM10 particles, ca. 7% of PM2.5 and approximately 32% for NOx. In Poland, suspended particles (PM10 and PM2.5) cause deaths of as many as 45,000 people a year. The issue of smog also affects other European cities. Therefore, it is necessary to undertake concrete efforts in order to reduce vehicle exhaust emissions as much as possible. It is therefore justifiable to reduce the emission of exhaust pollution, particularly NOx, PM, PN by conventional passenger cars powered by compression ignition engines. Emissions by these passenger cars have been reduced systematically. Comparative tests of the above emission of exhaust pollution were conducted on chassis dynamometer of such passenger car in NEDC cycle and in the new WLTC cycle in order to verify the level of emissions from this type of passenger car. Measurements of fuel consumption by that car were also taken. Emission of exhaust pollution and fuel consumption of the this car were also taken in the RDE road test.
    Źródło:
    Combustion Engines; 2019, 58, 3; 228-234
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the dynamics of lightweight shell and spatial structures with the aid of computational fluid dynamics and a shaking table
    Badania dynamiki lekkich konstrukcji powłokowych i przestrzennych przy zastosowaniu obliczeniowej mechaniki płynów oraz stołu wstrząsowego
    Autorzy:
    Padewska-Jurczak, Agnieszka
    Cornik, Dawid
    Walentyński, Ryszard
    Wiśniowski, Maciej
    Szczepaniak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27829900.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Opis:
    In determining the effects of actions when designing road structures, the influence of the loads caused by the buffeting of the passing vehicles (high-cycle forces) is neglected. Taking into account the fatigue load, they can have a very large impact on the assessment of the load capacity. The subject of analysis is the pressure and velocity distributions around a truck. At the current stage of the work, it can be concluded that the gusts of passing trucks affect the dynamics of the gantry structure and the elements suspended on it, such as platforms or boards. There is a strong suction force. It is possible to simplify the model in such a way that the board and the wind move with the speed of the vehicle while the truck remains stationary. Due to the lack of reliable guidelines for strength calculations of such structures, advanced Computational Fluid Dynamics (CFD) tools were used. This paper also presents a shaking table built by the authors for dynamic loading of structural models. It describes the construction of the shaking table and the kind of movement made by the table deck. It also shows a scheme of the table deck suspension on linear bearings, as well as a scheme of the table motion system.
    Przy określaniu skutków oddziaływań przy projektowaniu obiektów drogowych pomija się wpływ obciążeń wywołanych podmuchami od przejeżdżających pojazdów (siły wysokocyklowe). Biorąc pod uwagę również obciążenie zmęczeniowe, mogą one mieć bardzo duży wpływ na ocenę nośności konstrukcji. Przedmiotem analizy są rozkłady ciśnień i prędkości wokół samochodu ciężarowego. Na obecnym etapie prac można stwierdzić, że podmuchy od przejeżdżających ciężarówek wpływają na dynamikę konstrukcji bramownicy i zawieszonych na niej elementów, takich jak pomosty czy tablice. Istnieje duża siła ssąca. Możliwe jest uproszczenie modelu w taki sposób, aby tablica i wiatr poruszały się z prędkością pojazdu, podczas gdy ciężarówka pozostaje nieruchoma. Ze względu na brak rzetelnych wytycznych do obliczeń wytrzymałościowych takich konstrukcji, zastosowano zaawansowane narzędzia obliczeniowej mechaniki płynów (CFD). W artykule przedstawiono również zbudowany przez autorów stół wstrząsowy do dynamicznego obciążania modeli konstrukcyjnych. Opisano w nim konstrukcję stołu oraz rodzaj ruchu, jaki wykonuje płyta stołu. Przedstawiono również schemat zawieszenia płyty stołu na liniowych łożyskach oraz schemat układu ruchu stołu.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 4; 379--392
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tandemly repeated trinucleotides - comparative analysis
    Autorzy:
    Piwowar, Monika
    Meus, Jan
    Piwowar, Piotr
    Wiśniowski, Zdzisław
    Stefaniak, Justyna
    Roterman, Irena
    Powiązania:
    https://bibliotekanauki.pl/articles/1041237.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    trinucleotide tandem repeats
    microsatellites
    neurodegenerative disease
    Opis:
    Characteristics of 64 possible tandem trinucleotide repeats (TSSR) from Homo sapiens (hs), Mus musculus (mm) and Rattus norvegicus (rn) genomes are presented. Comparative analysis of TSSR frequency depending on their repetitiveness and similarity of the TSSR length distributions is shown. Comparative analysis of TSSR sequence motifs and association between type of motif and its length (n) using ρ-coefficient method (quantitatively measuring the association between variables in contingency tables) is presented. These analyses were carried out in the context of neurodegenerative diseases based on trinucleotide tandems. The length of these tandems and their relation to other TSSR is estimated. It was found that the higher repetitiveness (n) the lower frequency of trinucleotides tandems. Differences between genomes under consideration, especially in longer than n=9 TSSR were discussed. A significantly higher frequency off A- and T-rich tandems is observed in the human genome (as well as in human mRNA). This observation also applies to mm and rn, although lower abundant in proportion to human genomes was found. The origin of elongation (or shortening) of TSSR seems to be neither frequency nor length dependent. The results of TSSR analysis presented in this work suggest that neurodegenerative disease-related microsatellites do not differ versus the other except the lower frequency versus the other TSSR. CAG occurs with relatively high frequency in human mRNA, although there are other TSSR with higher frequency that do not cause comparable disease disorders. It suggests that the mechanism of TSSR instability is not the only origin of neurodegenerative diseases.
    Źródło:
    Acta Biochimica Polonica; 2006, 53, 2; 279-287
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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