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Wyświetlanie 1-15 z 97
Tytuł:
Self-Ignition Delay and Control Parameters of Diesel Engines for Different Vehicle Feeding Systems and Different Fuels
Autorzy:
Lotko, Wincenty
Powiązania:
https://bibliotekanauki.pl/articles/2024151.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
self-ignition delay
combustion process
fuel injection process
diesel engine
renewable fuels
opóźnienie samozapłonu
proces spalania
proces wtrysku paliwa
silnik wysokoprężny
paliwa odnawialne
Opis:
The phenomena accompanying the self-ignition period have been the subject of extensive research in this area. They are usually carried out in constant volume pressure chambers or in reactors with constant air flow. Such tests are considered to be basic. The conditions in these tests are definitely different from those in compression ignition engines. Therefore, the comparison of the auto-ignition delay periods from test setups to those obtained from real engines raises a number of doubts. Because the self-ignition delay period determines the combustion process, a theoretical analysis was conducted, pertaining to a number of factors that have an impact on this process which determines the operational aspects of the engine, and thus its economics and ecology. The research object was a single-cylinder engine from AVL LIST GmbH in Graz, Austria. The engine is equipped with a Common Rail injection system. The test setup meets the following standards: Directive 1999/96/EC of the European Parliament and the Council of 13th December 1999, Regulation (EC) No 715/2007 of the European Parliament and the Council of 20th June 2007, as well as Commission Regulation (EC) No 692 /2008 of 18th July 2008. The analysis of the operational aspects of the self-ignition delay period was based on the results of tests on the AVL 5402 engine fueled with hydrocarbon fuels: diesel and synthetic oil. The engine was also fed with vegetable fuel – rapeseed oil. The obtained material from the tests warns the user of CI engines against the effects of their failure if the engine control parameters and the quality of fuel for its supply are not maintained as recommended by the manufacturers. The material contained in the publication is used for scientific analysis, and, which is worth emphasizing, is of a utilitarian nature.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 1; 245-254
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distance of the initial weights of tree parity machine drawn from different distributions
Autorzy:
Dolecki, M.
Kozera, R.
Powiązania:
https://bibliotekanauki.pl/articles/102120.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
neural networks
neurocryptography
Opis:
It is well-known that artificial neural networks have the ability to learn based on the provisions of new data. A special case of the so-called supervised learning is a mutual learning of two neural networks. This type of learning applied to a specific networks called Tree Parity Machines (abbreviated as TPM networks) leads to achieving consistent weight vectors in both of them. Such phenomenon is called a network synchronization and can be exploited while constructing cryptographic key exchange protocol. At the beginning of the learning process both networks have initialized weights values as random. The time needed to synchronize both networks depends on their initial weights values and the input vectors which are also randomly generated at each step of learning. In this paper the relationship between the distribution, from which the initial weights of the network are drawn, and their compatibility is discussed. In order to measure the initial compatibility of the weights, the modified Euclidean metric is invoked here. Such a tool permits to determine the compatibility of the network weights’ scaling in regard to the size of the network. The proper understanding of the latter permits in turn to compare TPM networks of various sizes. This paper contains the results of the simulation and their discussion in the context of the above mentioned issue.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 26; 137--142
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internet tools in education at different levels of teaching
Autorzy:
Wójcicka-Migasiuk, D.
Urzędowski, A
Powiązania:
https://bibliotekanauki.pl/articles/102805.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
modern education
training software
e-learning
research software
Opis:
Modern education opens up broad prospects for the use of the Internet and its applications. Global computer network helps us to cross all limits allowed for the development and transfer of knowledge and to stimulate and create personal skills. Time and distance are no longer an obstacle. Recently, it has also been popularized in the use of online tools for professional work and intellectual and to the education at all levels of education. In this way, teachers are able to adapt teaching tools to the students’ individual needs. Moreover, the aspects of graphical visualization can be more efficient and interesting for students from previously used resources. This paper presents various methods of the Internet in education, and in particular the use of software to solve advanced problems in the art, for example, to calculate transient states. These tools are not only used for training skills or to solve specific tasks but also to shape attitudes and social behavior.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 24; 66-71
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of different methods of flight data logging used in multirotor UAVs
Autorzy:
Gąsior, P.
Bondyra, A.
Gardecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/114042.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microavionics
flash
RAM
memory card
Opis:
This paper describes the comparison of different methods of flight data logging in multirotor unmanned aerial vehicles. Solutions used in commercial avionics systems are presented and compared with the current design developed by authors. Based on the literature and analyzed examples, requirements for two separate logging systems are formulated. This approach allowed to modify current solutions and develop new methods for the high frequency data logging. Three different memory storages were considered for this task - SD card, RAM and external NAND Flash. Based on the theoretical calculations, developed prototypes and performed experiments, the best solution was selected.
Źródło:
Measurement Automation Monitoring; 2017, 63, 5; 168-170
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PPS Quality Estimation From Different Receivers
Autorzy:
Kubczak, P.
Matuszewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/114318.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
PPS signal
GPS
GLONASS
frequency source
time interval error
time measurement
synchronization
Opis:
The article presents data analysis of the short-term and long-term-periodic characteristics of the PPS (Pulse Per Second) signal from the navigation systems. The signal arrival time to the Earth was assessed in relation to a high stability frequency source. The basic statistical properties of the signal were calculated, e.g. mean, variance, autocorrelation and actual distributions of random variables were depicted by using a histogram. The differences have been compared between the quality of the signal from the GPS network, the GLONASS network and their combination. The equipment offered by various manufacturers was assessed. Finally, the impact of the MAV filter (Moving Average) on the characteristics of the random variable was examined. At last, but not least, the autocorrelation was checked.
Źródło:
Measurement Automation Monitoring; 2016, 62, 11; 383-386
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The types of computer graphics and their application at different levels of knowledge
Autorzy:
Makarewicz, A.
Korga, S.
Rosa, W
Powiązania:
https://bibliotekanauki.pl/articles/102456.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
visualization
dynamic geometry
teaching
Opis:
In this article we introduce the concept of computer graphics and graphical application C.a.R (Compasses and Ruler), its basic commands and several examples associated with the geometry. This subject is at all levels of knowledge in various stages of development. We will present the C.a.R possibilities that can be used in secondary schools, high schools and colleges. We show function graphs of varying degrees of difficulty that are too complicated for the human imagination.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 149-152
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concrete Capillarity under Different Curing Conditions Produced in Kurdistan-Iraq
Autorzy:
Herki, Bengin A.
Powiązania:
https://bibliotekanauki.pl/articles/102221.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
capillary water absorption
concrete
strength
UPV
absorpcja wody kapilarnej
beton
siła
Opis:
This study discussed the effect of the curing condition on the capillary water absorption of concrete incorporating the locally available materials. The compressive strength and ultrasonic pulse velocity (UPV) as part of mechanical and durability properties of concrete were also investigated. The engineering properties were conducted on concrete under three different curing conditions at different curing ages of 2 days, 7 days and 28 days. The three different curing conditions were water curing, dry curing and gunny-covered curing. According to the results obtained, the concrete under water curing condition demonstrated a lower capillary water absorption (CWA) at 2 and 7 days ages and the concrete under gunny-covered condition demonstrated lower CWA at 28 days of age, compared with the other curing conditions. It is interesting to see that the compressive strength (38 MPa) of concrete was almost the same at 28 days age under the gunny-covered and water curing conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 2; 131-139
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of Different WEDM Strategies Applied to Cut WC-Co Cemented Carbides
Autorzy:
Poroś, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2023467.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
WEDM
wire electrode
cemented carbides
roughness
elektrody druciane
węgliki spiekane
chropowatość
Opis:
Cemented carbides WC-Co feature high mechanical properties and outstanding wear resistance. Traditional grinding of such hard workpiece features low material removal rate and diminished tool life. Notwithstanding that, even if, proper cooling fluid is applied; abrasive machining of cemented carbides characterizes poor efficiency. The aim of this study was to investigate the issue of WEDM of the cemented carbides WC-Co with two alternative materials of the wire electrodes applied. The presented experimental surface layer geometry measurements was carried out on a modern profilometer MITUTOYO SV 3200. Especially, WEDM results with wire flushing and in immersion were compared. Investigated were the effects of such input parameters as the pulse width and the time between two pulses on the output parameters such as area cutting efficiency, workpiece surface roughness in 2D and 3D. Analysing SEM microphotographs the surface layer defects after WEDM, cobalt depletion and pitting was discoursed. The analysed results provided WEDM of WC-Co cemented carbides with molybdenum wire electrode as seventy one percent less efficient and higher roughness was obtained for the same number of passes. The lowest height of the roughness on the surface after cutting with molybdenum wire amounted to Ra and Sa = 3.5 μm. Such roughness involves a 25 μm deep undesirable heat affected zone. WEDM with equal number of passes and brass wire resulted in roughness Ra and Sa =0,9 μm. In further research, an endeavour should be directed to examine different water and hydrocarbons derivative dielectrics impact on the surface layer structure and chemical composition of the machined WC-Co carbides.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 126-135
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stacking sequence optimization of composite beams with different layer thicknesses
Autorzy:
Karaçam, F
Timarci, T
Powiązania:
https://bibliotekanauki.pl/articles/102025.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
laminated composite beams
static analysis
genetic algorithm
layer thickness
stacking sequence optimization
Opis:
In this study, stacking sequence optimization of composite beams with different layer thicknesses is investigated for various boundary conditions. A unified shear deformation theory is used for analytical solution. The optimization process is carried out in order to obtain the minimum deflection parameters for Clamped-Free (C-F), Clamped-Clamped (C-C) and simply supported (S-S) boundary conditions under a uniform distributed load by use of genetic algorithm for a specific number of population and generation. Finally, among all possible combinations of layer thicknesses, the one giving the minimum deflection parameter and corresponding stacking sequence is chosen. The minimum values and corresponding stacking sequences are presented for different boundary conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 26; 7-11
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement uncertainty analysis of different CNC machine tools measurement systems
Autorzy:
Semotiuk, L.
Józwik, J.
Kuric, I.
Powiązania:
https://bibliotekanauki.pl/articles/102390.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
measurement uncertainty
inspection probe
control system
CNC machine tool
Opis:
In this paper the results of measurement uncertainty tests conducted with a Heidenhain TS 649 probe on CNC machine tools are presented. In addition, identification and analysis of random and systematic errors of measurement were presented. Analyses were performed on the basis of measurements taken on two different CNC machine tools with Heidenhain control system. The evaluated errors were discussed and compensation procedures were proposed. The obtained results were described in tables and figures.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 19; 41-47
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametry barwy wołowiny kulinarnej z różnych krajów
Colour factors of culinary beef from different countries
Autorzy:
Cierach, M.
Wierzbicka, A.
Borzyszkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2070248.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wołowina kulinarna
barwa
culinary beef
colour
Opis:
W pracy zbadano parametry barwy wybranych gatunków wołowiny kulinarnej, która była zróżnicowana pod względem kraju pochodzenia. Zauważono, że w wyniku wzrostu zapotrzebowania na mięso wołowe w Unii Europejskiej nastąpił import tego surowca z krajów Ameryki Południowej i Stanów Zjednoczonych. Stwierdzono, że wołowina ta różni się parametrami barwy, w wyniku zróżnicowania rasowego oraz wpływu specyficznych warunków środowiskowych, hodowlanych i genetycznych na zwierzęta. Okazało się, że najwyższym parametrem jasności L* odznaczała się wołowina argentyńska i amerykańska, a najniższym mięso wolowe z Brazylii. Najwyższą „czerwoność" a* zanotowano w wołowinie polskiej (ZM „Warmia" w Biskupcu). Natomiast parametr „żółtości" 6* nie różnił się statystycznie istotnie w żadnym mięsie wołowym.
A given culinary beef type in terms of colour features and varied by a place of origin was studied. It was noticed that the increased beef demand in the UE led to beef import from the South America and USA. Beef colour features depend on an influence of environmental, breeding and genetic factors and racial division. It appeared that the highest brightness parameter, L*, was achieved for Argentinian and American beef, whereas the lowest one was noticed for Brazilian one. The highest 'redness' parameter, a*, was found for Polish beef. The 'yellowness' parameter, b*, did not differ significantly for these beef meat.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 2; 29-30
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of acceleration of different dynamic microobjects by the television scanning optical microscope
Autorzy:
Prudyus, I.
Matiieshyn, Y.
Powiązania:
https://bibliotekanauki.pl/articles/114123.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
television scanning optical microscope
microscope field of view
acceleration of movement
Opis:
The acceleration of the dynamic microobjects (MO) movement, the motion of which is accelerated uniformly or non-uniformly is an important task for television measuring systems. Most existing measuring systems usually have a small range of acceleration with a short period of growth. Such period of growth of the acceleration is characteristic for many dynamic MO. Better instruments to determine the non-uniform velocity of the various objects are based on various laser devices. These instruments are contactless and high-speed enough. In the paper the basics of the television scanning optical microscope (TSOM) are presented. In the Chapter 2 the schematic diagram of the TSOM and its main functionalities are pointed out. In the Chapter 3 an adaptation of the TSOM for movement acceleration of microobjects is discussed. Modified structural and functional diagram of the instrument is presented.
Źródło:
Measurement Automation Monitoring; 2015, 61, 8; 410-412
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM Simulation of Different Engine Mount Models in an Aircraft Piston Diesel Engine
Autorzy:
Magryta, Paweł
Pietrykowski, Konrad
Borowiec, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2204049.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
engine mount
diesel engine
aircraft
FEM
finite element method
Opis:
The article presents the results of numerical simulations using the FEM (Finite Element Method) of the engine mount strength for mounting an aircraft diesel engine with opposite pistons called PZL-100. Four versions of the mount prepared by aircraft engine producer WSK "PZL-Kalisz" company were analyzed. Tests were performed in Catia v5 software in the Generative Structure Analysis module. The boundary conditions were engine gravity force, propeller thrust force, and propeller torque. S235JR steel was defined as the material. A design grid with tetrahedral elements with a single element size of 2 mm was used. As part of the simulation study, four structural solutions for the test engine mounts were calculated in terms of strength. The results of stress maps and the magnitude of deformation of the mount elements were compared. Based on the obtained results, one of the mount versions was recommended for actual fabrication.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 230--241
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modal analysis of real timber frame houses with different insulation materials
Autorzy:
Szczepański, M.
Migda, W.
Jankowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/101994.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
timber frame house
earthquake resistance
dynamic
numerical model
modal analysis
Opis:
The aim of this article is to present the results of a numerical modal analysis of two actual structures of timber frame buildings and the different behaviour due to the used insulation material. One model of the timber structure was filled with mineral wool, while the other with polyurethane foam. During the modal analysis, eigenvalues for both models have been determined. The results of the analysis clearly show the increase of stiffness and damping properties of skeletal constructions achieved by the use of polyurethane foam as the skeleton filling. The numerical model was based on prior experimental test on real scale single frame elements, therefore the result can be assumed to be adequate.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 31; 215-221
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nawożenie a wartość opałowa ziarna różnych gatunków zbóż
Fertilization and calorific value of cereal grain different species
Autorzy:
Kaszkowiak, E.
Kaszkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2071391.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zboża
ziarno
spalanie
plonowanie
cereals
grain
combustion
fielding
Opis:
W pracy przedstawiono wyniki badań wartości energetycznej dla ziarna jęczmienia jarego i owsa jarego oraz jęczmienia ozimego i żyta ozimego przy różnym poziomie nawożenia azotem. Wzrost poziomu nawożenia azotem spowodował w większości zbóż wzrost zawartości skrobi i tłuszczu. Nie wpływał jednak istotnie na wartość energetyczną. Powodował jednak zmiany plonów.
The paper presents research results dealing with the energy value of grain of spring barley, spring oats, winter barley and winter rye at different levels of nitrogen fertilization. The increased level of nitrogen fertilization resulted in the increase of starch and fat content in most cereal. It did not affect significantly the energetic value, however, caused changes in yield.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 5; 59-60
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 97

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