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    Wyświetlanie 1-9 z 9
    Tytuł:
    Standing Waves in One-Dimensional Resonator Containing an Ideal Isothermal Gas Affected by the Constant Mass Force
    Autorzy:
    Perelomova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177416.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic resonator
    non-uniform media
    standing waves
    Opis:
    The study is devoted to standing acoustic waves in one-dimensional planar resonator which containing an ideal gas. A gas is affected by the constant mass force. Two types of physically justified boundary conditions are considered: zero velocity or zero excess pressure at both boundaries. The variety of nodal and antinodal points is determined. The conclusion is that the nodes of pressure and antinodes of velocity do not longer coincide, as well as antinodes of pressure and nodes of velocity. The entropy mode may contribute to the total field in a resonator. It is no longer isobaric, in contrast to the case when the external force is absent. Examples of perturbations inherent to the entropy mode in the volume of a resonator are discussed.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 263-271
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Standing Waves and Acoustic Heating (or Cooling) in Resonators Filled with Chemically Reacting Gas
    Autorzy:
    Perelomova, A.
    Pelc-Garska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177653.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    standing wave
    acoustic resonator
    non-equilibrium media
    Opis:
    Standing waves and acoustic heating in a one-dimensional resonator filled with chemically reacting gas, is the subject of investigation. The chemical reaction of A → B type, which takes place in a gas, may be reversible or not. Governing equations for the sound and entropy mode which is generated in the field of sound are derived by use of a special mathematical method. Under some conditions, sound waves propagating in opposite directions do not interact. The character of nonlinear dynamics of the sound and relative acoustic heating or cooling depends on reversibility of a chemical reaction. Some examples of acoustic heating in a resonator are illustrated and discussed.
    Źródło:
    Archives of Acoustics; 2014, 39, 3; 403-410
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DIVIDED BY CLASS, CONNECTED BY WORK: CLASS DIVISIONS AMONG THE NEW WAVE OF POLISH MIGRANTS IN THE UK
    Autorzy:
    Trevena, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/580225.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    POLES IN THE UK
    MIGRATION
    SOCIAL STANDING
    Opis:
    By now, it is a generally known fact that the majority of ‘new’ Polish migrants to the UK are carrying out simple, low-skilled work. At the same time, however, many of these migrants have considerably high levels of education (Anderson et al. 2006, Drinkwater et al. 2006, Fihel et al. 2008, Pollard et al. 2008). Up till now, this problem has been framed predominantly in terms of issues of brain drain, brain overflow and/or brain waste (Kaczmarczyk and Okolski 2005, Kaczmarczyk 2006). However, little attention has been given to the social world the ‘overqualified’ Polish migrants are living in. For the ‘overeducated’ migrants the world of work is often also one of class divisions. The values and general outlook of these (potentially) middle-class people often clash with those of their co-workers, i.e. working class Poles and Britons, resulting in a particular tension within the social environment of work as well as internal conflict. What is, therefore, the migrants’ perception of this situation? How do they view their class position in relation to their occupational and social standing in the UK? This article will be devoted to an analysis of these issues based on qualitative material gathered on well-educated Polish migrants working considerably below their level of qualifications.
    Źródło:
    Studia Migracyjne - Przegląd Polonijny; 2011, 37, 1(139); 71-96
    2081-4488
    2544-4972
    Pojawia się w:
    Studia Migracyjne - Przegląd Polonijny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of kinematics of sportsmen performing standing long jump in 2 different dynamical conditions
    Autorzy:
    Szerdiová, L.
    Šimšik, D.
    Dolná, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/221639.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kinematics
    dynamics
    standing long jump
    human motion analysis
    sports
    Opis:
    This paper presents results of the study devoted to analysis of impact of upper extremities' momentum on the jump length and analysis of selected kinematic data changes during the standing long jump. Four young sportsmen participated in the initial study. They have performed standing long jump in two measuring conditions: with and without arms swinging. Motion was captured using a 3D opto-electronic camera system SMART (BTS) and selected kinematic data were evaluated using software packages and data processing: trajectory of body centre of gravity (COG), velocity of COG, maximal vertical distance of COG, take-off angle together with momentum of upper extremities were analyzed. The data were statistically evaluated using descriptive statistics and analysis of variance. Statistical significance of the kinematic data and jump length were analyzed using the Kruskal-Wallis test and post-hoc test (p<0.05) in Statistics toolbox of Matlab program. Statistically significant differences were assessed within intraindividual and intraclass comparison of data.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 85-94
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Standing Waves in a Rectangular Resonator Containing Acoustically Active Gases
    Autorzy:
    Perelomova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176719.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    standing waves
    acoustically active gas
    resonator
    nonlinear propagation of sound
    Opis:
    The distribution of perturbations of pressure and velocity in a rectangular resonator is considered. A resonator contains a gas where thermodynamic processes take place, such as exothermic chemical reaction or excitation of vibrational degrees of a molecule’s freedom. These processes make the gas acoustically active under some conditions. We conclude that the incident and reflected compounds of a sound beam do not interact in the leading order in the case of the periodic sound with zero mean pressure including waveforms with discontinuities. The acoustic field before and after forming of discontinuities is described. The acoustic heating or cooling in a resonator is discussed.
    Źródło:
    Archives of Acoustics; 2016, 41, 1; 67-73
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Synthesis and Modification of Conical Ni Structures by One-Step Method
    Autorzy:
    Skibińska, K.
    Semeniuk, S.
    Kutyła, D.
    Kołczyk-Siedlecka, K.
    Jędraczka, A.
    Żabiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049399.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrodeposition
    one-step method
    crystal modifier
    nickel cones
    free-standing structures
    Opis:
    In this work the conical Ni structures were obtained from an electrolyte containing NH4Cl as a crystal modifier. This process is called one-step method and allows to cover large areas with micro- and nanostructures during a single electrodeposition. Presence of NH4Cl promotes a vertical direction of structure growth in order to block a horizontal one. Additionally, this method does not require using chromic acid solution, which is dangerous for the environment. Due to the ferromagnetic properties of Ni, obtained coatings could be applied as magnetic devices. The influence of the parameters such as a preparation of copper substrate, a composition of electrolyte and electrodeposition conditions (time, the electrolyte temperature and current density) was investigated in this work.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 861-869
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability Characteristics of Free-Standing Nanowires Based on the Strain Gradient Theory with the Consideration of Casimir Attraction and Surface Effects
    Autorzy:
    Sedighi, H. M.
    Ouakad, H. M.
    Khooran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220374.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    free-standing cylindrical nanowire
    Casimir force
    proximity force approximation
    Dirichlet asymptotic approximation
    Opis:
    Size-dependent dynamic instability of cylindrical nanowires incorporating the effects of Casimir attraction and surface energy is presented in this research work. To develop the attractive intermolecular force between the nanowire and its substrate, the proximity force approximation (PFA) for small separations, and the Dirichlet asymptotic approximation for large separations with a cylinder-plate geometry are employed. A nonlinear governing equation of motion for free-standing nanowires – based on the Gurtin-Murdoch model – and a strain gradient elasticity theory are derived. To overcome the complexity of the nonlinear problem in hand, a Garlerkin-based projection procedure for construction of a reduced-order model is implemented as a way of discretization of the governing differential equation. The effects of length-scale parameter, surface energy and vacuum fluctuations on the dynamic instability threshold and adhesion of nanowires are examined. It is demonstrated that in the absence of any actuation, a nanowire might behave unstably, due to the Casimir induction force.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 489-507
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave absorption by used moulding and core sands
    Autorzy:
    Nowak, D.
    Stachowicz, M.
    Granat, K.
    Pigiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380205.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recykling
    współczynnik fali stojącej
    mikrofale
    materiał formierski
    recycling
    standing wave ratio
    microwaves
    moulding materials
    Opis:
    The paper presents measurement results of standing wave ratio to be used as an efficiency indicator of microwave absorption by used moulding and core sands chosen for the microwave utilization process. The absorption measurements were made using a prototype stand of microwave slot line. Examined were five used moulding and core sands. It was demonstrated that the microwave absorption measurements can make grounds for actual microwave utilization of moulding and core sands.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 87-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochłanianie mikrofal przez zużyte masy formierskie i rdzeniowe
    Microwave absorption by used moulding and core sands
    Autorzy:
    Nowak, D.
    Stachowicz, M.
    Granat, K.
    Pigiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382415.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    utylizacja mikrofalowa
    współczynnik fali stojącej
    materiał formierski
    microwave utilization
    standing wave ratio
    foundry material
    Opis:
    W pracy zaprezentowano wyniki badań pomiaru współczynnika fali stojącej dla oceny skuteczności pochłaniania mikrofal przez zużyte masy formierskie i rdzeniowe wytypowane do przeprowadzenia z ich udziałem procesu mikrofalowej utylizacji. Badania pochłaniania mikrofal zostały przeprowadzone z wykorzystaniem prototypowego stanowiska mikrofalowej linii szczelinowej. Badaniom poddano pięć zużytych mas formierskich i rdzeniowych. Wykazano, że uzyskane wyniki pochłaniania mikrofal mas formierskich i rdzeniowych daje podstawy do przeprowadzenia z ich udziałem procesu mikrofalowej utylizacji.
    The paper presents measurement results of standing wave ratio to be used as an efficiency indicator of microwave absorption by used moulding and core sands chosen for the microwave utilization process. The absorption measurements were made using a prototype stand of microwave slot line. Examined were five used moulding and core sands. It was demonstrated that the microwave absorption measurements can make grounds for actual microwave utilization of moulding and core sands.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 149-152
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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