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    Wyświetlanie 1-8 z 8
    Tytuł:
    Noise emission of diesel engine powered by blend of diesel oil and ethyl tert-butyl ether
    Hałas silnika wysokoprężnego zasilanego mieszaninami eteru etylo-tert-butylowego z olejem napędowym
    Autorzy:
    Górski, K.
    Maciąg, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/263084.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    emisja hałasu
    proces spalania
    silnik wysokoprężny
    combustion process
    diesel engine
    noise emission
    Opis:
    The article presents results of research on noise emission from AD3.152 diesel engine powered by blends of diesel fuel (DF) and ethyl tert-butyl ether (ETBE). Measurements were executed in steady-state conditions for different engine partial loads, crankshaft rotational speeds and angles of fuel injection start. The research shows that engine noise emission increases for all tested ETBE/diesel blends in comparison to pure diesel fuel. The highest values of noise emission were recorded for ETBE40. Preliminary analysis of the combustion process suggests that noise emissions increase in line with the value of in-cylinder pressure.
    W artykule przedstawiono wyniki badań emisji hałasu silnika AD 3.152 zasilanego mieszaninami standardowego oleju napędowego i eteru etylo-tert-butylowego. Pomiary wykonano w warunkach ustalonych dla różnych obciążeń częściowych, prędkości obrotowej wału korbowego i kątów początku wtrysku paliwa. Badania pokazują, że emisja hałasu silnika wzrastała dla wszystkich badanych mieszanin paliwowych w stosunku do oleju napędowego. Największe wartości emisji hałasu zarejestrowano dla ETBE40. Wstępna analiza procesu spalania wskazuje, że emisja hałasu wzrasta wraz z prędkością narastania ciśnienia w komorze spalania.
    Źródło:
    Archiwum Motoryzacji; 2010, 3; 217-224
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building a wireless sensor network with use of RFM 12 modules - data exchange between nodes
    Autorzy:
    Mazur, D.
    Maciąg, P.
    Kielan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/114472.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    IEEE 802.15.4 standard
    wireless sensor networks
    RFM modules
    ATmega processors
    Opis:
    IEEE 802.15.4 standard defines Physical (PHY) and Wireless Medium Access Control (MAC) layers for wireless sensor networks (WSN). In recent years, many types of wireless sensor networks have been developed based on this standard. Currently, probably the most popular implementation of the mentioned standard are wireless ZigBee networks. Moreover, ZigBee provides functions normally attributed to the higher layers of network protocol stack. Among those the most important functions are: routing of data, data encryption and providing redundancy connections between devices in the network. We present a slightly different approach to the construction of wireless sensor networks. This is the beginning of series of papers about implementation of the IEEE 802.15.4 standard and the previously mentioned expansion functions in the network, built with RFM wireless communication modules and ATmega processors. This paper describes the basics of compiling wireless connection and data transmission with using RFM modules. In addition, blocking and non-blocking types of connections between radio modules and ways to connect RFM modules with ATmega processors are described.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 9; 438-442
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of vibroacoustic signals recorded in the passenger lift cabin
    Autorzy:
    Szydło, K.
    Maciąg, P.
    Longwic, R.
    Lotko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/102723.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    vibroisolations
    sound measuring
    noise emission
    Opis:
    The analysis of private tests is presented in the article. The applicable tests refer to accelerations, the level of the sound pressure as well as to the sound power emitted by the passenger lift cabin at different technical conditions of the lift. For a group of lifting devices the accelerations were tested at three axes with the use of an accelerometer. The accelerometer was placed in the central part of the cabin with simultaneous measurement of the acoustic parameters with the sound analyzer equipped with sound volume double microphone probe. An attempt was made to determine the impact of the frame - cabin system construction as well as the lift’s technical condition on the recorded parameters. It can allow to establish the limit values of the lift structure parameters under which a rapid drop of comfort takes place, while travelling in the lift as well as to indicate those construction elements the modification of which would affect the improvement of the operation noiselessness.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 30; 193-201
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetric Tunneling Conductance in Doped Antiferromagnets
    Autorzy:
    Maciąg, A.
    Wróbel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046776.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Mn
    74.25.Fy
    Opis:
    We calculate the tunneling conductance in the framework of the spin polaron model, which is an effective model for the t-J model, in the limit where at least short-range antiferromagnetic correlations exist. We show that both in the normal state and in the superconducting state the asymmetry of tunneling conductance is present. This fact is the implication of the particle-hole asymmetry of the spin polaron Hamiltonian in the limit of low density of spin polarons which are quasiparticles emerging in a hole doped antiferromagnet. Experimental evidence of analogous asymmetric tunneling conductance was found in the tunneling spectroscopy measurements of high T$\text{}_{c}$ superconductors.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 607-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Electronic Structure on the Phase Diagram of Weakly Doped Superconducting Cuprates
    Autorzy:
    Maciąg, A. M.
    Wróbel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047334.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Mn
    74.25.Dw
    Opis:
    Motivated by the difference between the experimental phase diagram of cuprates and expectations of the t-J model, we analyze the influence of the electronic structure on superconducting state generation for small levels of doping. Following some theoretical studies of the Fermi surface for hole doped superconducting cuprates we base our calculations on the t-t'-t''-J model. We construct the spin polaron model, which is an effective model for the t-J model, and we expand it by adding the new terms related to the next neighbor hopping integrals t' and t''. In the framework of this model we study evolutions of superconducting correlation functions with doping. As a result of numerical calculations we find out that superconducting state vanishes for small levels of doping and finite values of t' and t''. This is in qualitative agreement with experimental results.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 721-725
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The usage of Trefftz functions and Picards iteration for solving different problems of a two-dimensional wave equation
    Autorzy:
    Krzyszkowska, P.
    Maciąg, A.
    Walaszczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/122544.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    wave equation
    Trefftz functions
    Picard's iteration
    równanie falowe
    funkcje Trefftza
    iteracja Picarda
    Opis:
    The paper presents a method of solving two-dimensional wave equations which describe vibrations of the membrane with variable thickness and with damping. The differential operator is decomposed into two parts. The first one describes vibrations of the membrane with constant thickness without damping. The second contains the rest of the original operator and is treated as inhomogeneity for the first one. Picard’s iterations are used to calculate a successive approximation of the exact solution. Trefftz functions (wave polynomials) are used to solve the problem in each iteration. The presented examples show the usefulness of the method. The approach described in this paper can be used also for solving nonlinear problems for a wave equation.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 3; 129-140
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconventional Superconductivity, Spontaneous Time-Reversal Symmetry Breaking and Lowering of Kinetic Energy in Doped, Short-Range Antiferromagnets
    Autorzy:
    Wróbel, P.
    Maciąg, A.
    Eder, R.
    Fulde, P.
    Micnas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038385.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Mn
    71.10.Fd
    Opis:
    In this paper we focus on the anomalous temperature dependence of the in-plane conductivity and symmetry mixing of the superconducting order parameter observed in various experiments on cuprates. We show that the one-band Hubbard model is not capable of describing the physics of cuprates because the kinetic energy is lowered in this model in the superconducting state, which contradicts experimental observations. The proper model to investigate doped, short-range antiferromagnets is the t-J model, for which our results agree with experiments. We analyze a spin polaron model, that is an effective model for a doped antiferromagnet. In the framework of this model we also study the superconducting order-parameter symmetry-mixing phenomenon. We show that the expected mixing of d-wave symmetry with p-wave symmetry takes place in the superconducting order-parameter at a finite value of the doping parameter. This symmetry mixing brakes the time-reversal symmetry.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 575-581
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates
    Autorzy:
    Wróbel, P.
    Maciąg, A.
    Suleja, W.
    Eder, R.
    Micnas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536806.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Mn
    74.72.Kf
    Opis:
    We argue that three gaps observed in underdoped cuprates can be attributed to the formation of antiferromagnetic spin polarons and bipolarons. Within the spin polaron scenario the antinodal pseudogap at he high energy scale originates from the change of the Fermi surface topology, induced by antiferromagnetic correlations. That change gives rise to the diminishing of the spectral weight at the antinodal region near the Brillouin zone boundary. We demonstrate that effect by analyzing effective models of doped antiferromagnets. The second type of pseudogap appearing at the intermediate energy scale originates from the phenomena which are precursory to superconductivity and predominantly concern the portion of the Fermi surface near the nodal region. In order to analyze the latter phenomenon we use the negative U Hubbard model, in which many details typical to spin polaron physics are neglected, but which contains the essential ingredient of it, that is the strong short range attraction. The lowest energy scale is related to the true superconducting gap which develops with doping, although both types of pseudogap diminish with doping. This behavior can be explained by the fact that the spin polaron band is empty in the undoped system and therefore the formation of the superconducting state in the system is forbidden. Due to a pedagogical character of this report, we present in the introduction a short overview of mostly recent experimental results which are related to the gap-pseudogap physics.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 292-298
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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