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Wyświetlanie 1-15 z 16
Tytuł:
A stress-based formulation of the free material design problem with the trace constraint and single loading condition
Autorzy:
Czarnecki, S.
Lewiński, T.
Powiązania:
https://bibliotekanauki.pl/articles/202340.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
free material design
anisotropic elasticity
compliance minimization
Opis:
The problem to find an optimal distribution of elastic moduli within a given plane domain to make the compliance minimal under the condition of a prescribed value of the integral of the trace of the elastic moduli tensor is called the free material design with the trace constraint. The present paper shows that this problem can be reduced to a new problem of minimization of the integral of the stress tensor norm over stresses being statically admissible. The eigenstates and Kelvin’s moduli of the optimal Hooke tensor are determined by the stress state being the minimizer of this problem. This new problem can be directly treated numerically by using the Singular Value Decomposition (SVD) method to represent the statically admissible stress fields, along with any unconstrained optimization tool, e.g.: Conjugate Gradient (CG) or Variable Metric (VM) method in multidimensions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 191-204
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-instantaneous generation of reference signals for hybrid compensator control
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262594.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
compensator control
CPC
harmonic filters
hybrid compensators
power variation
power theory
non-periodic currents
semi-periodic currents
harmonics
Opis:
Power variation of a customer load can disturb other loads in distribution systems and compensators for such loads are sometimes needed. Voltages and currents in systems with such loads can be asymmetrical, nonperiodic, distorted and even unpredictable. Consequently, reference signals for the compensator control have to be generated in a situation where the power properties of the load are not well specified. Voltages and currents in systems with time-varying loads, although nonperiodic, can be treated as quantities with a disturbed periodicity. These are referred to as semi-periodic quantities. Under such an assumption, the Current Physical Components (CPC) power theory can by used for estimation of the power properties of such loads. In such a case, the CPC power theory provides fundamentals for a quasi-instantaneous generation of reference signals for the compensator control, based both on the frequency- and on the time-domain approach. The paper presents fundamentals of generation of reference signals for unbalanced loads with semi-periodic voltages and currents.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 3-8
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powers of Asymmetrically Supplied Loads in Terms of the CPC Power Theory
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262671.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Opis:
Power related phenomena in three-phase, three-wire circuits with linear time-invariant (LTI) loads supplied with asymmetrical sinusoidal voltage are investigated in this paper. The study is based on the concept of the Currents’ Physical Component (CPC) power theory. It is shown that the supply current of LTI loads with sinusoidal asymmetrical voltage, as in the case of symmetrical voltage, is composed of only three physical components, the active, reactive and unbalanced currents. Consequently, loads in such conditions can be characterized by the active, reactive and unbalanced powers. The equivalent and unbalanced admittances of three-phase loads at symmetrical supply voltage are constant, independent on the supply voltage, parameters. The paper shows that these parameters at asymmetrical supply depend on the voltage asymmetry.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 1; 97-104
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Currents physical components (CPC) in circuits with nonsinusoidal voltages and currents. Part 1, Single-phase linear circuits
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262747.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
nonsinusoidal voltages and currents
harmonics
power definitions
power phenomena
apparent
reactive
scattered
unbalanced currents or powers
Opis:
The paper summarizes the present state of discussions on power phenomena, power definitions and compensation in single-phase linear circuits. The main concepts developed over several decades on how various non-active powers in circuits with nonsinusoidal voltages and currents should be defined and compensated are presented along with a detailed discussion of these concepts. The paper presents also the concept of the single-phase load current decomposition into Currents' Physical Components (CPC) and its application for power definitions and compensation in such circuits. The paper is not addressed to scientists and experts on powers, but rather to common electrical engineers that sometimes face power related problems in nonsinusoidal systems.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 3-14
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Currents Physical Components (CPC) in Circuits with Nonsinusoidal Voltages and Currents. Part 2: Three-Phase Three-Wire Linear Circuits
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262598.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
power definition
power phenomena
apparent
reactive
scattered
unbalanced currents or powers
Opis:
This paper summarizes the present state of discussions on power phenomena, power definitions and compensation in three-phase three-wire linear circuits with nonsinusoidal voltages and currents. In particular, definitions of the arithmetic and geometric apparent powers are discussed. It is shown that these two powers result in an erroneous value of power factor of unbalanced loads even if voltages and currents are sinusoidal. A reasoning that leads to a right selection of the apparent power definition is presented as well. The paper also presents the con-cept of the three-phase current decomposition into Currents' Physical Components (CPC) and its application for power definitions and compensation in three-phase circuits.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 3-13
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Some Properties of Instantaneous Active and Reactive Powers
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262612.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
active power filters
CPC theory
harmonics
non-sinusoidal systems
switching compensators
Opis:
Some features of the instantaneous active and reactive powers p and q , not reported earlier, are discussed in this paper. It is shown that oscillating components and of these powers may not depend on the order of the load current harmonic. It was shown, moreover, that a load supplied with a nonsinusoidal voltage may not be distinguished in terms of p and q powers from a harmonics generating load (HGL) supplied with a sinusoidal voltage. This observation is important for compensator control. Also it was shown that the instantaneous reactive power q cannot be interpreted as a measure of amount of energy exchanged between supply lines of a load or as amount of energy rotating around such lines, as it was suggested in some publications on the IRP p-q Theory. A phenomenon of energy rotation or exchange between lines does not exist.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2013, 16, 1; 11-17
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Interpretation of the Reactive Power in Terms of the CPC Power Theory
Autorzy:
Czarnecki, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/262669.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Opis:
Discussion on the physical interpretation of the reactive power Q is the subject of the paper. This power in common physical interpretation used to be associated with energy oscillation between the load and the supply source. The paper demonstrates that such interpretation is not correct. Just the opposite, the interpretation of the reactive power Q as an effect of energy oscillation is one of the major misinterpretations of power phenomena in electrical circuits. The Currents’ Physical Components (CPC) power theory is the main theoretical tool used in the discussion presented in this paper.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 1; 89-95
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization in structural mechanics
Autorzy:
Lewiński, T.
Czarnecki, S.
Dzierżanowski, G.
Sokół, T.
Powiązania:
https://bibliotekanauki.pl/articles/202001.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
structural optimization
topology optimization
free material design
anisotropic elasticity
compliance minimization
minimum weight design
funicular structures
optimal design of frames
Opis:
Optimization of structural topology, called briefly: topology optimization, is a relatively new branch of structural optimization. Its aim is to create optimal structures, instead of correcting the dimensions or changing the shapes of initial designs. For being able to create the structure, one should have a possibility to handle the members of zero stiffness or admit the material of singular constitutive properties, i.e. void. In the present paper, four fundamental problems of topology optimization are discussed: Michell’s structures, two-material layout problem in light of the relaxation by homogenization theory, optimal shape design and the free material design. Their features are disclosed by presenting results for selected problems concerning the same feasible domain, boundary conditions and applied loading. This discussion provides a short introduction into current topics of topology optimization.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 23-37
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Forms of Leading the Aviation Firms. International Perspectives of Future Trends in Global Aviation Industry
Autorzy:
Kalisz, David E.
Czarnecki, Paweł S.
Powiązania:
https://bibliotekanauki.pl/articles/2158535.pdf
Data publikacji:
2018
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
viation
airline
business model
strategy
competition
jet engine
Opis:
Polish air transport is an important component of both the European and global transport services market. Enterprises and institutions responsible for its development should be conducive to shaping the most competitive position of entities of the air transport market. In Polish airports and branch infrastructural investments, balanced and sustainable development should be taken into account, determining the level of quality of services provided and access to the market. These aspects are highlighted in the strategy for the development of regional airports, whose task is also to stimulate the mobility of people and their transport activities. Air transport, although it is a relatively young form of transport, the history of which goes back over a hundred years back, is nowadays a very important element of the global economy. In the last decades the air passenger transport was treated as an elite one. It has now become very common and has contributed to the mobility of people in many regions of the world. More and more often, not only global companies or corporations are talked about, but also referring to the ease of moving, taking up work or studying in different parts of the world, away from the home country, people choose most often the air transportation.
Źródło:
Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne; 2018, 2(29); 27-36
1898-0171
Pojawia się w:
Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comments on "Physical Interpretation of the Reactive Power in Terms of CPC Power Theory Revisited"
Autorzy:
Czarnecki, L. S.
Haley, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/262839.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
power definitions
scattered power
scattered current
harmonic generating loads
HGL
harmonic generated power
finite energy signals
Opis:
The paper evaluates the possibility of formulating the Currents’ Physical Component (CPC) – based power theory in the time-domain. It was concluded that the currents’ physical components, defined originally in the frequency-domain, can be calculated in the time-domain, but there is still the lack of their physical interpretation in that domain.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2013, 16, 2; 7-9
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence-based Practice in Social Work Education
Autorzy:
Suvada, Jozef
Olah, Michal
Czarnecki, Pawel S.
Powiązania:
https://bibliotekanauki.pl/articles/2135492.pdf
Data publikacji:
2013
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
evidence-based practice
social work
education
Opis:
This paper contains a review of the current literature around the dissemination of evidence-based practice (EBP), current social work models for dissemination of EBP, interviews with experts in the field, and a synthesis of this combined knowledge into recommendations for future dissemination of research and EBP efforts.
Źródło:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne; 2013, 1(10); 221-248
1898-8431
Pojawia się w:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Social Work Education: Historical and Current Perspectives
Autorzy:
Suvada, Jozef
Czarnecki, Pawel S.
Otim, Robert
Akol, Zainab
Powiązania:
https://bibliotekanauki.pl/articles/2135336.pdf
Data publikacji:
2013
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
social pedagogy
social work
education
evaluation
work-based education
Źródło:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne; 2013, 2(11); 261-283
1898-8431
Pojawia się w:
Humanum. Międzynarodowe Studia Społeczno-Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of changes in sod under intensive use
Ocena zmian zachodzących w darni pod wpływem intensywnego użytkowania
Autorzy:
Czarnecki, J.
Cudzik, A.
Brennensthul, M.
Białczyk, W.
Wolski, K.
Świerszcz, S.
Powiązania:
https://bibliotekanauki.pl/articles/93485.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
sod
compactness
maximum shear stress
sodding
darń
zwięzłość
maksymalne naprężenie ścinające
zadarnienie
Opis:
The paper presents research results which aimed at evaluation of the change in the sodding degree and selected strength parameters of sod used with varied intensity; additionally sod was modified through administration of biopreparation. Measurements were taken on two types of sod. The first one was formed from perennial rye grass, the second one from orchard grass. It was proved that the use of the investigated facilities resulted in reduction of sodding, which was related to the sod forming species. No impact of biopreparation use on the sodding degree was proved. Intensive use affected the increase of the value of the analysed strength parameters; at low soil moisture (5.0-5.5%) considerable compaction in the surface layer of soil was reported.
W pracy przedstawiono wyniki badań, których celem była ocena zmian stopnia zadarnienia oraz wybranych parametrów wytrzymałościowych darni użytkowanej z różną intensywnością, dodatkowo darń modyfikowano poprzez podanie biopreparatu. Pomiary wykonano na dwóch rodzajach darni, z których pierwsza darń utworzona była z życicy trwałej, druga z kupkówki pospolitej. Wykazano, że użytkowanie badanych obiektów skutkowało spadkiem ich zadarnienia, które było ściśle związane z gatunkiem tworzącym darń. Nie wykazano wpływu stosowania biopreparatu na stopień zadarnienia. Intensywne użytkowanie wpływało na zwiększenie wartości analizowanych parametrów wytrzymałościowych, przy niskiej wilgotności gleby (5,0-5,5%) zauważono znaczne zagęszczenie w wierzchniej warstwie gleby.
Źródło:
Agricultural Engineering; 2017, 21, 3; 5-15
2083-1587
Pojawia się w:
Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characterization of Carane Derivative Stereoisomers - Potent Local Anesthetics
Autorzy:
Grochowski, J.
Serda, P.
Pasenkiewicz-Gierula, M.
Czarnecki, R.
Librowski, T.
Lochyński, S.
Frąckowiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/2030630.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Qt
61.10.-i
Opis:
The paper reports on structural investigation and phase analysis of a newly synthesized potent local anesthetic with chiral molecular structure. Absolute structure and absolute configuration on four chiral centres was determined using microcrystalline single-crystal diffraction with anomalous scattering of X-ray radiation azimuthal scan technique. Phase analysis for new compound (KP23SS) and its epimer (KP23RS) was carried out using classical and synchrotron radiation powder diffraction. Enantiopurity of the bulk material was verified for both isomers by comparison of experimental and simulated high-resolution powder diffraction diagrams. The presence of two new polymorphic phases of KP23RS was documented. Comparative conformational analysis was carried out using differential Fourier synthesis and least-squares molecule overlap technique. A model of epimeric disorder was discussed for the homochiral phase.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 665-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Effective Microorganisms Technology as a lake restoration tool - a case study of Muchawka Reservoir
Autorzy:
Sitarek, M.
Napiórkowska-Krzebietke, A.
Mazur, R.
Czarnecki, B.
Pyka, J.P.
Stawecki, K.
Olech, M.
Sołtysiak, S.
Kapusta, A.
Powiązania:
https://bibliotekanauki.pl/articles/1190178.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
restoration
eutrophication
remediation
EM
nutrients
Opis:
This paper presents the effects of an application of Effective Microorganisms (EM) technology in line with the method developed by Sitarek, thus evaluating its effectiveness as a tool in the biological restoration of a water body. In 2012-2013, EM was applied in Muchawka Reservoir situated in the town of Siedlce (eastern Poland). Analyses of water parameters and bottom sediments were carried out in 2011, before the EM technology was implemented and again in 2013-2015 after the EM application was completed. In spring 2011, the average total nitrogen (TN) content at the surface was 3.1 mg dm-3 while the total mineral nitrogen content equalled 0.893 mg dm-3. After the EM application was completed, in the summer of 2013, the TN content was on average 2.5 mg dm-3. The content of nitrates and nitrites in the summer of 2013 reached 1.20 mg dm-3 at the most. Lower levels of such forms of nitrogen were observed in 2013 and also in subsequent years at the bathing beach (site 1) and the hostel (site 3) than at the inflow (site 4). Likewise, the highest content of phosphates was recorded at the inflow site (4), being four -fold lower at the other sites (1, 3). The average content of TP before the EM technology was applied was 0.205 mg dm-3, whereas after the application of effective microorganisms it fell down to 0.189 mg dm-3 (2013-2015). Only slight changes of TSITP indicated that waters in Muchawka Reservoir were eutrophic. After EM was applied twice, no streaks, cyanobacterial scums or pollution at the bathing sites were visible. The bacteriological evaluation of the water samples was carried out by the County Branch of the State Sanitary Inspectorate in Siedlce. The bacteriological water quality was described as “excellent”. These findings suggest that the method developed by Sitarek, combined with probiotic preparations, could be a useful tool in the restoration of water bodies, but the conclusion requires further detailed verification.
Źródło:
Journal of Elementology; 2017, 22, 2; 529-543
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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