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Wyszukujesz frazę "Ziółkowski, Andrzej" wg kryterium: Autor


Tytuł:
Parametrization of Cauchy stress tensor treated as autonomous object using isotropy angle and skewness angle
Autorzy:
Ziółkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/38887565.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Cauchy stress
oriented geometrical object
isotropy angle
skewness angle
isomorphic cylindrical coordinates
pure shear
comparison reference state
anisotropy factor
biaxial tests
simple shear
planar shear
triaxiality factor
Opis:
Intrinsic features (eigenproperties) of the Cauchy stress tensor are discussed. Novelty notions of isotropy and skewness mode angles are introduced for the improved parametric description of spherical (isotropic) and deviatoric (anisotropic) components of stress tensor. The skewness angle is defined with pure shear employed as a comparison reference mode upon observing that pure shear states can be interpreted as elementary (atomic) blocks of any macroscopic deviatoric stress state. An original statistical-physical interpretation of the stress tensor orthogonal invariants is provided. A micromechanical explanation for observed decrease of the stress tensor anisotropy factor values, measured in terms of the tensor orbit diameter, with stress deviator diverging from pure shear mode, is proposed. Explicit reasons explaining why biaxial experimental layouts (simple shear and/or planar shear) are insufficient for the comprehensive characterization of materials properties submitted to complex stress states loadings are presented. New explicit formulas for the triaxiality factor valid for biaxial stress states are delivered.
Źródło:
Engineering Transactions; 2022, 70, 3; 239-286
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetry
Autorzy:
Rychlewski, Jan
Ziółkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/38902795.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
definition of symmetry
concept of Γ-set
orbits of elements
orbit markers
ornament principle
motif
symmetry of causes and effects
invariant extension of function
Opis:
The concept of symmetry was introduced already by the ancient Greeks in relation to spatial (geometric) systems. They understood it as commensurability and proportionality and linked it with the aesthetic categories of harmony and beauty. A spatial system (object) was considered symmetric if it consisted of regular, repeatable parts of comparable size, creating a coordinated, ordered, larger whole. Only two thousand years later, in the twentieth century, the essence of the concept of symmetry was identified. Symmetry is invariance (stability, durability, constancy) of a feature (geometric, physical, biological, informational, etc.) of an object (an object can here be a geometric system, a material thing, but also a natural phenomenon, physical law, social relation, etc.) after subjecting it to a set of transformations (transformations can be shifts, reflections, rotations, permutations, etc.), with respect to which symmetry is considered. The above observation led to the discovery of the universal nature of the concept of symmetry, which in a broader sense can be understood as a philosophical category, one of the fundamental regularities of mathematical character in the organization of the Universe. The contemporary understanding of symmetry has led to significant and nonobvious conclusions. For example, it turned out that the invariance (symmetry) of the laws of motion with respect to the shift in time is equivalent to the necessity of the existence of the principle of conservation of energy, the invariance (symmetry) of the laws of motion with respect to the shift in physical space proves to be equivalent to the existence of the principle of conservation of momentum. The Report provides an outline of the general formal language of symmetry applicable to the study of any situation in which this concept appears. The key elements of the mathematical apparatus of the algebraic theory of symmetry are defined and discussed, the notions of Γ-sets, orbits, orbital markers, invariants, and invariant functions. They provide versatile tools enabling the analysis of all types of symmetries. The Report concisely presents important results of the theory of symmetry, such as: the ornament principle – expressing the most straightforwardly the innermost property of complex symmetrical objects, the representation theorem for symmetric objects, the theorem on the symmetry of causes and effects of physical laws, the theorem on invariant extension of any function.
Źródło:
Engineering Transactions; 2023, 71, 2; 265-283
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Krytyczna analiza badań eksperymentalnych dotyczących kontekstualizmu
Autorzy:
Ziółkowski, Adrian Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/706062.pdf
Data publikacji:
2012-09-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kontekstualizm
inwariantyzm
filozofia eksperymentalna
kontekstualizmepistemiczny
inwariantyzm zależny od interesu
metodologia,eksperyment
Opis:
Oprócz wielu innych problemów filozoficznych, w obszarze zainteresowań filozofów eksperymentalnych znalazła się w ostatnich latach problematyka kontekstualizmu. Większość przeprowadzonych w tym zakresie badań dotyczyła scenariuszy bankowych autorstwa Keitha DeRose’a, mających stanowić argument na rzecz kontekstualizmu epistemicznego. Choć niektóre z przeprowadzonych do tej pory eksperymentów przemawiają na rzecz kontekstualizmu, w wypadku przeważającej ich części nie udało się uzyskać wyników stanowiących wsparcie dla tej koncepcji. W artykule omawiam najważniejsze badania empiryczne poruszające wspomnianą tematykę. Główna teza artykułu głosi, że zrealizowane dotychczas badania są, ze względu na swe istotne niedoskonałości metodologiczne, niekonkluzywne, a nawet jeśli pozwalają rozstrzygnąć między skrajnymi wersjami kontekstualizmu i inwariantyzmu, nie pozwalają na to samo w odniesieniu do bardziej umiarkowanych wersji tych stanowisk.
Źródło:
Przegląd Filozoficzny. Nowa Seria; 2012, 3; 299-314
1230-1493
Pojawia się w:
Przegląd Filozoficzny. Nowa Seria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of emissions and fuel consumption from forklifts by location of operation
Autorzy:
Ziółkowski, Andrzej
Fuć, Paweł
Jagielski, Aleks
Bednarek, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2097652.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
forklifts
portable emission measurement system
PEMS
exhaust emission
fuel consumption
wózki widłowe
przenośne systemy pomiaru emisji
emisja spalin
zużycie paliwa
Opis:
The share of road transport accounts for more than 85% of the total structure of freight transportation. In this process, mainly motor vehicles are used to carry out the freight work. In addition to them, forklifts are also used, whose task is to load and unload goods. These vehicles are categorized as NRMM (Non-Road Mobile Machinery). Forklift trucks have internal combustion or electric drive. The paper presents an analysis of the emission of pollutants and fuel consumption from forklift trucks equipped with diesel and LPG power. The study uses the author's test taking into account the raising/lowering of a pallet, a loaded and unloaded run. The measurements were made in the warehouse and outside the warehouse using the Portable Emission Measurement System (PEMS) equipment. The aim was to show the influence of loading conditions on the emission of pollutants and fuel consumption.
Źródło:
Combustion Engines; 2022, 61, 2; 30--35
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pułki ułanów Księstwa Warszawskiego : 6-ty, 3-ci, 2-gi : 1807-1812. [T. 1]
Autorzy:
Ziółkowski, Andrzej (1956- ).
Borowski, Jacek (historia).
Pełka, Mariola.
Współwytwórcy:
Czop, Jan. Ilustracje
Marszałek, Dariusz. Redakcja
Firma Handlowo Usługowa NAPOLEON V, Dariusz Marszałek. pbl
Data publikacji:
2013-2014
Wydawca:
Oświęcim : Wydawnictwo Napoleon V
Tematy:
Wojsko Księstwa Warszawskiego
Kawaleria
Wojsko
Opis:
Informacja o części na podstawie wprowadzenia.
Bibliogr. s. 359-363. Indeks.
Dostawca treści:
Bibliografia CBW
Książka
Tytuł:
An analysis of the use of cruise control in a passenger car
Autorzy:
Andrzejewski, Maciej
Merkisz, Jerzy
Nowak, Mateusz
Ziółkowski, Andrzej
Daszkiewicz, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/263054.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
fuel consumption
cruise control
speed driving strategy
Opis:
Most vehicles are powered by internal combustion engines. Due to the nature of their operation they emit, among others, carbon dioxide which contributes to the greenhouse effect. CO2 production is strictly correlated with fuel consumption. The article presents the results of road tests of a passenger car with a spark-ignition engine meeting the Euro 6 emission norm. The test vehicle was equipped with a classic exhaust gas aftertreatment system – a three-way catalytic converter. The aim of the study was to verify the impact of the cruise control use on the vehicle fuel consumption. The measurements were based on Portable Emission Measurement System type mobile equipment for exhaust emission tests. The tests were carried out in real driving conditions travelling on an express way. Test drives took place on a route with variable topographic profile. Three test drives with different speeds were carried out, but the aim was to obtain an average speed of 130 km/h.
Źródło:
Archiwum Motoryzacji; 2020, 89, 3; 37-49
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tests of a prototype spark-ignited, direct-injection engine powered by JET-A1 fuel
Autorzy:
Świątek, Piotr
Fuć, Paweł
Ziółkowski, Andrzej
Świątek, Lech
Melwiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/133682.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
alternative fuel
test engine
piston aircraft engine
jet-a1
paliwo alternatywne
silnik testowy
tłokowy silnik lotniczy
Opis:
The article presents a part of the work done in a research and development project being made by SWIATEK Lech Swiatek company. It describes the comparison of different fuels used in piston engines with JET-A1 turbine engine fuel. Next, the proposed combustion process of JET-A1 fuel and a prototype one-cylinder engine are described. In details, a special cylinder head and direct injection programmable computer are presented. In the next part, a designed and built test stand is described. Finally, the results and conclusions are presented. The designed test stand enabled to perform assumed tests. The innovative JET-A1 combustion process was possible to perform and the power and torque were higher in 1900-3000 rpm range than with the gasoline fuel. The designed GDI programmable injection computer enabled to fully control the injection and ignition parameters.
Źródło:
Combustion Engines; 2019, 58, 3; 117-120
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the environmental costs in Poland of city buses meeting the Euro VI norm based on tests in real operating conditions
Autorzy:
Rymaniak, Łukasz
Fuć, Paweł
Lijewski, Piotr
Kamińska, Michalina
Daszkiewicz, Paweł
Ziółkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/223940.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
evaluating the costs
city buses
exhaust emissions
HDV
RDE
PEMS
ocena kosztów
autobusy miejskie
emisje spalin
Opis:
The article analyzes the environmental costs which consisted of determining the annual cost for gases and particles released into the atmosphere by city buses meeting the Euro VI norm. To this end, exhaust emissions of a city bus equipped with a conventional drive system were performed. The vehicle had a length of 18m and was powered by a CI engine with a swept volume of 10,5 dm3, with a maximum power of 240 kW. In order to measure the ecological indicators, tests were performed in real driving conditions using the PEMS system. The apparatus made it possible to measure the concentration of gaseous compounds and particulate matter in the exhaust, which made it possible to determine the road exhaust emissions of the tested vehicle. The research was carried out on a test route including urban and suburban roads in accordance with legislative guidelines. The measurements showed that the bus met the exhaust emission limits determined on the basis of measuring windows defined in relation to the work generated by the drive system. In addition to information on the emissivity of the vehicle, the annual emissions from city buses meeting the Euro VI standard in Poland were also estimated. The information contained in the central vehicle register for the number of vehicles registered in Poland that meet the latest emission standards has been used for this purpose.
Źródło:
Archives of Transport; 2019, 52, 4; 109-115
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology for manufacturing catalytic systems using a pilot line for precious metal recovery
Autorzy:
Fuć, Paweł
Sokolnicka-Popis, Barbara
Ziółkowski, Andrzej
Bednarek, Maciej
Jagielski, Aleks
Michałowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/24202483.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
DPF
TWC
PM
catalytic systems
układy katalityczne
Opis:
The subject of this article is to compare the effectiveness of commercial exhaust gas aftertreatment systems such as TWC and GPF with their prototype variant, which is produced on a pilot line that allows the recovery of precious metals. What's more, the said production line allows the manufacture of components compliant with Euro IV, V and VI standards. Depending on the model of the monolith made, it is possible to reduce the consumption of precious metal raw materials by up to 20%, which should be considered a significant result. The article describes in detail the manufacturing process of metal carriers using the mentioned technology. A dynamic engine dynamometer was used for tests verifying the effectiveness of particulate filters, on which the RDE test route covering the area of the Poznan agglomeration was mapped. The tests performed are particularly important, as it should be borne in mind that according to the forecast in 2025, internal combustion engines powered by conventional fuels will account for 85% of all propulsion sources. In addition, the increasing environmental awareness of vehicle users and manufacturers requires solutions to reduce PM emissions into the atmosphere in both mass and number.
Źródło:
Combustion Engines; 2023, 62, 3; 89--96
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innowacyjne bezołowiowe farby utwardzane promieniami UV do malowania szkła użytkowego
Innovative lead-free UV-cured paint coatings for decorating utility glass
Autorzy:
Langer, Ewa
Zubielewicz, Małgorzata
Kamińska-Bach, Grażyna
Jurczyk, Sebastian
Bańcer, Teresa
Ziółkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/41149865.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
farby utwardzane UV
malowanie szkła
przyczepność do szkła
UV-cured paints
glass painting
adhesion to glass
Opis:
Omówiono wyniki badań nad opracowaniem farb utwardzanych promieniami UV przeznaczonych do malowania szkła użytkowego. Opracowano kompozycje lakierowe różniące się rodzajem oligomerów, monomerów i fotoinicjatorów oraz środków pomocniczych, wypełniaczy i pigmentów barwiących. Odpowiednio dobrany układ promotorów adhezji, złożony z pochodnej estrowej kwasu fosforowego oraz aminofunkcyjnego silanu, zapewnił uzyskanie bardzo dobrej przyczepności do szkła bez jakiejkolwiek wstępnej obróbki powierzchni. Powłoki odznaczały się ponadto bardzo dobrym usieciowaniem i doskonałymi właściwościami odpornościowymi.
The results of research on the development of UV-cured paint coatings for utility glass are discussed. Paint compositions differing in the type of oligomers, monomers and photoinitiators as well as additives, fillers and colouring pigments have been developed. A properly selected system of adhesion promoters, consisting of an ester derivative of phosphoric acid and an amino-functional silane, provides very good adhesion to glass without any preliminary surface treatment. In addition to very good adhesion, the coatings are characterized by very good crosslinking and resistance properties.
Źródło:
Ochrona przed Korozją; 2023, 9; 274-287
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of exhaust emission measurements in rural conditions from heavy-duty vehicle
Autorzy:
Ziółkowski, Andrzej
Fuć, Paweł
Lijewski, Piotr
Rymaniak, Łukasz
Daszkiewicz, Paweł
Kamińska, Michalina
Szymlet, Natalia
Jagielski, Aleks
Powiązania:
https://bibliotekanauki.pl/articles/2097466.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
heavy-duty vehicle
emission test
exhaust emission
samochód ciężarowy
badanie emisji
emisja spalin
Opis:
Road transport holds for the largest share in the freight transport sector in Europe. This work is carried out by heavy vehicles of various types. It is assumed that, in principle, transport should take place on the main road connections, such as motorways or national roads. Their share in the polish road infrastructure is not dominant. Rural and communal roads roads are the most prevalent. This fact formed the basis of the exhaust emissions and fuel consumption tests of heavy vehicles in real operating conditions. A set of vehicles (truck tractor with a semi-trailer) meeting the Euro V emission norm, transporting a load of 24,800 kg, was selected for the tests. The research was carried out on an non-urban route, the test route length was 22 km. A mobile Semtech DS instrument was used, which was used to measure the exhaust emissions. Based on the obtained results, the emission characteristics were determined in relation to the operating parameters of the vehicles drive system. Road emission, specific emission and fuel consumption values were also calculated.
Źródło:
Combustion Engines; 2020, 59, 3; 54--58
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł

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