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Tytuł:
Geometrically non-linear analysis of shells
Autorzy:
Ambroziak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1955341.pdf
Data publikacji:
2022-01-27
Wydawca:
Politechnika Gdańska
Tematy:
FEM
locking
shell
geometric non-linear
Opis:
The work's aim has been to verify the suitability of commercial engineering software for geometrically non-linear analysis of shell structures. The paper deals with static, geomet-rically non-linear analysis of shells made of isotropic materials. The Finite Element Method (FEM) has been chosen to solve the problem. The results of the ROBOBAT Ro-bot Millennium v. 19.0 and MSC.Marc v. 2005r2 commercial software are compared with the literature results.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 239-251
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrashort pulses supported by SESAM absorber
Autorzy:
Jasik, A.
Muszalski, J.
Gaca, J.
Wójcik, M.
Pierściński, K.
Powiązania:
https://bibliotekanauki.pl/articles/200639.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DBR
SESAM
mode-locking
femtosecond pulses
Opis:
We have developed a mode-locked diode-pumped Yb:KYW laser generating nearly band-width limited pulses as short as 101 fs. At 1.1 W absorbed power and 3% transmission output coupler, the laser delivers 150 mW for pulse duration of 110 fs, what corresponds to an efficiency of 14%. It was achieved using semiconductor saturable absorber mirror (SESAM) grown by molecular beam epitaxy. SESAM contains a distributed Bragg reflector (DBR) completed by single quantum well (SQW) playing role of an absorbing layer. The absorbers were crystallized in accordance with the predicted structure parameters under optimised growth conditions. The resonant-like type of structures ensured relatively high enhancement factor due to antireflective properties of SiO2 capping material and a wavelength independence of a group delay dispersion. The optimisation of the growth conditions of both an absorbing layer and DBR structure were widely carried out. Optical reflectance and high resolution X-ray diffraction have been used for characterization and verification of DBR structures. It results in reduction of the nonsaturable absorption in SESAM and self-starting mode-locking of the ultrashort pulses.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 477-483
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volumetric locking suppression method for nearly incompressible nonlinear elastic multi-layer beams using ANCF elements
Autorzy:
Orzechowski, G.
Frączek, J.
Powiązania:
https://bibliotekanauki.pl/articles/949295.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
multibody dynamics
ANCF
incompressibility
locking phenomena
multi-layer beams
Opis:
The analysis and solution of many modern flexible multibody dynamic problems require formulations that are able to effectively model bodies with nonlinear materials undergoing large displacements and deformations. The absolute nodal coordinate formulation (ANCF) in connection with a continuum-based approach is one way to deal with these systems. The main objective of this work is to extend an existent approach for the modelling of slender structures within the ANCF framework with nonlinear, nearly incompressible materials using the volumetric energy penalty technique. The main part of the study is devoted to the evaluation of multi-layer beam models and simplifications in the locking suppression method based on F-bar projection. The results present significantly better agreement with the reference solution for multi-layer structures built with the standard ANCF beam element as compared with the earlier implementation.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 977-990
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of linewidth enhancement factor (LEF) on routes to chaos in optically injected semiconductor lasers
Autorzy:
Al-Hosiny, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/2033881.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
injection locking
chaos
linewidth enhancement factor
routes to chaos
Opis:
The effect of the linewidth enhancement factor (LEF) or α-factor on two common routes to chaos (mainly period-doubling and quasi-periodic routes) in optically injected semiconductor laser is theoretically investigated using bifurcation diagrams. The value of the LEF is slightly modified to examine the sensitivity of routes to chaos to any variation in the LEF. Despite the fact that LEF enhances chaos in the system, both routes are found to be highly insensitive to the variation in the LEF.
Źródło:
Optica Applicata; 2021, 51, 4; 621-632
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of diesel fuel feed system with divided processes of forcing and dosing out
Autorzy:
Slavutskiy, V.
Salykin, E.
Belozubov, Y.
Kanygin, Z.
Powiązania:
https://bibliotekanauki.pl/articles/246069.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
system modernization
locking device
giving phase
pilot giving
differential characteristic
Opis:
A fuel delivery method that patented by authors realised by numerical and natural experiments. The traditional system is added a lock organ before an injector. The injector cavity is connected with the force main only for the time of injecting fuel. After a valve closing the injector cavity is connected with the cavity of low pressure. When cutting off at the end of the working plunger stroke the force main is discharging. In a delivery high-pressure the accumulation of energy flow takes place, it increases speed growing of pressure in the injection beginning. The valve closing is accompanied by fast pressure decrease in the end of injection process. Such feeder of fuel allows dividing forcing and dosing out processes. It improves, in comparison with traditional, both adaptive and power properties of system. Numerical experiments confirm working capacity of the modernised fuel feed system. Defined influence of its basic constructive and adjusting parameters on indicators of process of fuel delivery is presented. The offered system allows a flexible adjustment of the cycle fuel feed when changing a high speed regime as well as providing for a set speed Diesel characteristic and a versatile regulation if the cycle feed at Diesel start. The numerical experiments confirm the efficiency of the experimental system of fuel feed.
Źródło:
Journal of KONES; 2009, 16, 1; 459-464
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybór i zastosowanie lanych elastomerów uretanowych w dźwigniowo-sprężynowych bezpiecznikach pługów
Choice and application of cast urethane elastomers to lever-spring overload lockings in the ploughs
Autorzy:
Stężała, S.
Ptaszyński, S.
Pałka, G.
Wieczorek, S.
Powiązania:
https://bibliotekanauki.pl/articles/239644.pdf
Data publikacji:
2005
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
bezpiecznik
pług
sprężyna
elastomer uretanowy
plough
overload locking
spring
urethane elastomer
Opis:
Przeprowadzono badania trzech rodzajów lanych elastomerów uretanowych w aspekcie zastosowania jako sprężyn mechanicznych zabezpieczeń pługów. Wytypowano jeden z nich jako spełniający założone wymagania. Wyznaczono jego charakterystykę jako zależność wielkości odkształcenia od wielkości siły sprężającej i odprężającej. Na jej podstawie skonstruowano sprężynę spełniającą stawiane mechanicznym bezpiecznikom pługów uwarunkowania techniczno-użytkowe. Prototypy sprężyn poddano badaniom eksploatacyjnym w trakcie orki zakamienionego gruntu, wyznaczając charakterystykę pracy bezpieczników uzbrojonych w nowe sprężyny. Uzyskane wyniki wskazują na ich przydatność użytkową, a efekty orki odpowiadają efektom stosowania pługów z zabezpieczeniami hydro-pneumatycznymi.
Three kinds of cast urethane elastomers were tested in respect of their application as the springs to mechanical lockings of the ploughs. One of them has been chosen as complying with assumed requirements. Its characteristic was determined as a dependence of strain rate on compressive and decompressive forces. On such a basis the spring was constructed that complied with technical and operation requirements for mechanical lockings of the ploughs. The prototype springs were subjected to oprating tests in the course of ploughing on stony ground; operation characteristic was evaluated for overload lockings equipped with the new springs. The test results proved their usability: the effects of ploughing were equivalent to those obtained at using ploughs with hydro-pneumatic lockings.
Źródło:
Problemy Inżynierii Rolniczej; 2005, R. 13, nr 4, 4; 17-28
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Error reduction of the Doppler lidar signal using a re-normalization method
Autorzy:
Park, N G
Baik, S H
Park, S K
Kim, D L
Kim, D. H.
Powiązania:
https://bibliotekanauki.pl/articles/173914.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
injection-seeded laser
Doppler lidar
frequency locking
wind lidar
Doppler velocity measurement
Opis:
In this paper, we present a re-normalization method for a Doppler signal of a Doppler lidar system. For the Doppler lidar system, we used an injection-seeded pulsed Nd:YAG laser as a transmitter and an iodine cell as a Doppler frequency discriminator. A frequency locking system that uses the absorption feature of iodine gas is too sensitive to the external or internal noises (iodine cell temperature instability, laser frequency fluctuation, environmental noises, etc.) to maintain its locking point ideally, and this frequency locking error makes the Doppler lidar system acquire the noises as the Doppler frequency shifts. To reduce the Doppler signal error induced by a frequency locking error, we used a re-normalization method by an addition of a laser beam path separated from a transmitter to the Doppler frequency discriminator for re-normalization. In this method, fluctuations of the Doppler signal were reduced using the reference signal. The reduced amount of standard deviation between the Doppler signal and the re-normalization signal was 4.838×10–3 and the Doppler signals showed a 53.3% fluctuation reduction of the averaged error value by this method.
Źródło:
Optica Applicata; 2014, 44, 1; 103-111
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomechanical analysis of limited-contact plate used for osteosynthesis
Autorzy:
Pochrząst, M.
Basiaga, M
Marciniak, J.
Kaczmarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/306242.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
internal fixation
biomechanics
locking compression plates
fracture
titanium alloys
biomechanika
pękanie
stop tytanu
Opis:
This paper presents the results of numerical analysis aimed at determining the state of stresses and displacements of compression plate used in osteosynthesis of tibia, carried out by applying finite element method using the ANSYS program. The analysis took into account two variants of the osteosynthesis. Variant I included the osteosynthesis in which plate was attached directly to the bone, in variant II, the plate was moved away from the bones by about 5 mm. Biomechanical characteristics of the corrective osteotomy plate–tibia was determined for implants made of Ti-6Al-4V alloy. The boundary conditions adopted for the analysis reflect phenomena occurring in a real system. Based on the results of the analysis relative displacements and reduced stresses in various components were determined as a function of the applied load within the range of F = 500–1500 N. The maximum forces, both variant I and variant II determined during analysis, ensure that the generated stress does not exceed yield strength of the material and compressive strength of the bone, and do not exceed safety movement in the fracture gap. In addition, it was found that the locking of the compressive plate to the bone has a little effect on the distribution of displacements and stresses on the plate–tibia system in the case of a simple fracture.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 1; 99-105
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended penalty coefficients for elimination the locking effects in moderately thick beam and plate finite elements
Autorzy:
Gilewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/230116.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metoda elementów skończonych
blokada ścinania
stabilizacja
spójność
finite elements method
shear locking
stabilization
consistency
Opis:
The present paper is dedicated to presentation and energy verification of the methods of stabilization the strain energy by penalty coefficients. Verification of the methods is based on the consistency and ellipticity conditions to be satisfied by the finite elements. Three methods of stabilization are discussed. The first does not satisfy the above requirements. The second is consistent but cannot eliminate parasitic energy terms. The third method, proposed by the author, is based on the decomposition of the element stiffness matrix. The method can help to eliminate locking of the finite elements. For two-noded beam element with linear shape functions and exact integration a stabilized free of locking (and elliptical) element is received (equivalent to reduced integration element). Two plate finite elements are analyzed: four-noded rectangular element and DSG triangle. A new method of stabilization with the use of four independent parameters is proposed. The finite elements with this kind of stabilization satisfy the consistency condition. In the rectangular element it was not possible to eliminate one parasitic term of energy which appears during the procedure. For DSG triangle all parasitic terms of energy are eliminated. The penalty coefficients depends on the geometry of the triangle.
Źródło:
Archives of Civil Engineering; 2014, 60, 3; 367-385
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu nieosiowego położenia par obrotowych siłownika na sprawność mechaniczną
Analysis of the effect of hydraulic cylinder rotational couplings unalignment on its mechanical efficiency
Autorzy:
Stępniewski, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/287012.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
siłownik
tarcie
sprawność mechaniczna
samohamowność
hydraulic cylinder
rotational pairs
friction
mechanical efficiency
self-locking
Opis:
Przeanalizowano wpływ błędu położenia osi par obrotowych mocowania siłownika na sprawność mechaniczną. Założono, że siły reakcji działają pomiędzy pierścieniami tłoka i cylindrem lub siły reakcji działają pomiędzy pierścieniem tłoka i cylindrem i pomiędzy tłoczyskiem i uszczelnieniem. Zamodelowano cztery warianty błędnego położenia środków par obrotowych, gdy błąd położenia dotyczy jednej z par (cylindra lub tłoczyska) i obu par jednocześnie a osie par obrotowych znajdują się po tej samej lub przeciwnych stronach osi siłownika. Siły tarcia obliczono iteracyjnie z warunków równowagi statycznej. Wyznaczono przebiegi sprawności oraz wymiary odległości osi par obrotowych od osi siłownika, dla których połączenie jest samohamowne.
The effect of axial alignment of hydraulic cylinder rotational pairs on its mechanical efficiency was analyzed. It was assumed that the reaction forces appear between piston rings and cylinder as well as between piston rod and the sealing. Four variants of unalignment were modeled: only one rotational pair is unaligned to cylinder axis (two cases) and both rotational pairs are shifted from cylinder axis (including two options – the shift to opposite direction or to the same direction). The friction forces were iteratively computed for the static balance conditions. Computed mechanical efficiency was plotted as a function of unalignment (normalized) for the interval from zero to value of device self-locking (when the efficiency is equal zero).
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 8, 8; 367-375
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple three-stage frequency-stabilized diode laser system using injection-locking and tapered amplifier
Autorzy:
Szonert, Jerzy
Głódź, Małgorzata
Kowalski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2063897.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
diode laser
optical injection-locking
master oscillator power amplifier
optical limiting amplifier
tapered amplifier
Opis:
We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5%) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (recision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.
Źródło:
Opto-Electronics Review; 2022, 30, 1; 1--13
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forces Generated in the Parking Brake of the Pallet Locking System
Autorzy:
Hrabovský, Leopold
Mlčák, Tomáš
Kotajný, Gustav
Powiązania:
https://bibliotekanauki.pl/articles/102668.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
automated parking system
locking system
pallet brake
zautomatyzowany system parkowania
system blokowania
hamulec paletowy
Opis:
Automatic parking systems are parking structures with a computer-controlled automated vehicle loading and unloading process using sophisticated technological equipment. The paper describes a construction design for a pallet locking system, which is used to lock parking pallets with or without a vehicle, at a particular location and floor, that is, in a rack cell. This is one of the basic design concept variants of “Multi-Tower” automatic parking systems. This concept makes it possible to store cars stacked in rack cells. Cars on pallets are guided to the vertical cells of the parking system, stacked above each other on pallets, by an electric freight traction elevator. Pallets are stacked into the horizontal cells, on either or both sides, on a given floor of the parking system by means of a chain transfer device. After the pallet has been guided to a particular position, the pallet must be fixed in this position by the pallet locking system so that when the vehicle needs to be retrieved, the chain transfer device can again latch onto it and move it to the traction lift cage without any problems. The locking system also functions as a brake for the pallet carrying the parked vehicle. The paper also presents the theoretical calculations of the pallet brake, which is a crucial element of the pallet locking system of the conceptual variant of the “MULTI TOWER” automatic parking system.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 181-187
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple fiber Bragg grating sensing system based on active mode-locking fiber laser
Autorzy:
Meng, Delong
Yu, Xiaolei
Zhao, Zhimin
Shan, Shilei
Li, Hongzhe
Powiązania:
https://bibliotekanauki.pl/articles/2172831.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fibre optics
Fabry-Perot laser diode
fibre laser
active mode-locking
fibre Bragg grating
Opis:
In this paper, a new multiple fiber Bragg grating (FBG) sensing system based on active mode-locking fiber laser is proposed. The active mode-locking fiber laser is composed of a linear cavity with an Fabry–Perot laser diode (F-P LD) as a reflective cavity mirror, and the erbium-doped fiber as the gain medium. Meanwhile, the F-P LD is also used as the modulating element of the fiber laser. Multiple FBGs cascaded in a long fiber are used as both the sensors in the system and the components for wavelength selection in the active mode-locking fiber laser. The capacity of the proposed sensing system to interrogate multiple FBGs in wavelength and spatial domain is investigated. The proposed sensing system has the characteristics of low cost, good stability, good compatibility, and can be used in quasi-distributed multi-point sensing.
Źródło:
Optica Applicata; 2022, 52, 3; 375--384
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wizualizacja śladów blokowania kół pojazdu oraz zmiana drogi hamowania przy zmiennej wilgotności nawierzchni asfaltowej
The visualization of the traces of the blocked wheels and the change of the breaking distance at various levels of humidity of the asphalt surface
Autorzy:
Kępa, P.
Tereszkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/313388.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
droga hamowania
blokada kół pojazdu
nawierzchnia jezdni
breaking distance
locking the vehicle wheels
road surface
Opis:
Zatrzymanie pojazdu przed torem ruchu innego użytkownika drogi jest możliwe wtedy, gdy w chwili powstania zagrożenia pojazd znajduje się w odległości większej niż droga potrzebna do jego zatrzymania. Często zdarza się, że od chwili zaistnienia zdarzenia do chwili podjęcia oględzin miejsca zdarzenia wilgotność nawierzchni jezdni, w wyniku działania warunków atmosferycznych, ulega zmianie. W artykule omówiono wpływ zmiany drogi zatrzymania pojazdu przy różnej wilgotności nawierzchni asfaltowej na podstawie przeprowadzonego eksperymentu oraz wizualizację śladów powstałych na mokrej nawierzchni asfaltowej po jej wyschnięciu.
Stopping the vehicle in front of another road user’s traffic track is possible when, at the moment when the danger occurred, the vehicle’s distance is greater than the distance required to stop it. Often does it happen that since the time of the traffic incident to the time of the inspection, the humidity of the road surface changes as a result of the change of weather conditions. The article discusses the influence of the change of the vehicle stopping distance at different humidity levels of the asphalt surface on the basis of the conducted experiment and the visualization of the traces made on wet asphalt after drying.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 212-215, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of algorithms for separation of synchronous subspaces
Autorzy:
Almeida, M.
Bioucas-Dias, J.
Vigário, R.
Oja, E.
Powiązania:
https://bibliotekanauki.pl/articles/201566.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase locking
synchrony
source separation
subspaces
Independent Component Analysis (ICA)
Independent Subspace Analysis (ISA)
magnetoencephalogram (MEG)
Opis:
Independent Subspace Analysis (ISA) consists in separating sets (subspaces) of dependent sources, with different sets being independent of each other. While a few algorithms have been proposed to solve this problem, they are all completely general in the sense that they do not make any assumptions on the intra-subspace dependency. In this paper, we address the ISA problem in the specific context of Separation of Synchronous Sources (SSS), i.e., we aim to solve the ISA problem when the intra-subspace dependency is known to be perfect phase synchrony between all sources in that subspace. We compare multiple algorithmic solutions for this problem, by analyzing their performance on an MEG-like dataset.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 455-460
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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