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Tytuł:
A discrete variable based methodology for topology optimization considering spatially uneven manufacturing errors
Autorzy:
Xia, Meng
Li, Jing
Powiązania:
https://bibliotekanauki.pl/articles/27309953.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
interval field
manufacturing errors
morphological operations
topology optimization
Opis:
Manufacturing errors (MEs) are unavoidable in product fabrication. The omnipresence of manufacturing errors (MEs) in product engineering necessitates the development of robust optimization methodologies. In this research, a novel approach based on the morphological operations and interval field (MOIF) theory is proposed to address MEs in the discrete-variable-based topology optimization procedures. On the basis of a methodology for deterministic topology optimization (TO) based on the Min-Cut, MOIF introduces morphological operations to generate geometrical variations, while the dimension of the structuring element is dynamically set by the interval field function’s output. The effectiveness of the proposed approach as a powerful tool for accounting for spatially uneven ME in the TOs has been demonstrated.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 1121--1133
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conformational Ensemble of B Chain in $T_{6}$ Human Insulin Based on the Landau Free Energy
Autorzy:
Lei, Yanlin
He, Jianfeng
Liu, Jiaojiao
Li, Jing
Powiązania:
https://bibliotekanauki.pl/articles/1398189.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
insulin
structural flexibility
free energy
conformational ensemble
Opis:
Insulin is an important peptide hormone for the glucose metabolism. The structural flexibility of insulin B chain attracts a lot of our attention for understanding the biological activity. Our work carried out the extensive sampling to statistically clarify the structural changes of isolated $T_{6}$ human insulin B chain. We introduced the Landau free energy to describe the isolated insulin B chain whose experimental structure locates a local energy minimum. Its trained model was subjected to thousands of heating and cooling circles between the high and low temperatures. Six typical structure clusters were found by classifying the final generated structures with RMSD and radius of gyration. The structures in clusters indicate the potential deformations of insulin B chain at residues 5-8 of N-terminus, residues 9-12 of central helix and residues 24-29 of C-terminus, which agrees with the experimental results.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1261-1265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital watermarking algorithm based on 4-level discrete wavelet transform and discrete fractional angular transform
Autorzy:
Li, Jing-You
Zhao, Chun-Hui
Zhang, Guang-Da
Powiązania:
https://bibliotekanauki.pl/articles/2033921.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital watermarking algorithm
mix optical bistability
Harris feature point detection
discrete wavelet transform
discrete fractional angular transform
singular value decomposition
Opis:
Nowadays, there are many watermarking algorithms based on wavelet transform. The simple one is to insert directly the watermark into the wavelet transform coefficients. However, most of the existing watermarking schemes can only resist traditional signal processing attacks, such as image compression, noise and filtering. When the watermarked image is subject to geometric transformations, especially rotation attack, it is hard to detect the watermark successfully. In this paper, a digital watermarking algorithm is proposed based on 4-level discrete wavelet transform and discrete fractional angular transform. To enhance the security of the algorithm, the watermark is scrambled with the simplicity of Arnold transform and chaos-based mix optical bistability model, since the chaos is pseudorandom and sensitive to the initial values. And the watermark is embedded into the medium frequency sub-band of the 1-level wavelet decomposition according to the Harris feature point detection. Simulation results show that the proposed digital watermarking algorithm by combining 4-level discrete wavelet transform with discrete fractional angular transform could resist rotation attack and other common attacks.
Źródło:
Optica Applicata; 2021, 51, 4; 605-619
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of electromagnetic performance of the interior permanent magnet brushless DC motor with stator slot skewed structure based on quasi-3D moving electromagnetic-field circuit coupling calculation
Autorzy:
Gan, Xue-Gui
Fan, Zhen-Nan
Li, Jing-Can
Powiązania:
https://bibliotekanauki.pl/articles/2042795.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interior permanent magnet brushless DC motor
quasi-three-dimensional electromagnetic-field circuit coupling analysis
stator slot skew
Opis:
This paper takes a 50 kW interior permanent magnet brushless DC motor as an example, and explores the influence of the degree of stator slot skew on the overall motor magnetic density and air gap magnetic density; then reveals the influences of stator slot skewed structure on a series of key electromagnetic properties like no-load back electromotive force (B-EMF), cogging torque, electromagnetic torque, torque fluctuation, electromagnetic loss, input power, output power and operating efficiency. On this basis, a relatively best range of the skew degrees is obtained. The research work in this paper has direct reference value for the further improvement of design and manufacture, operation and maintenance, control and protection of such motors.
Źródło:
Archives of Electrical Engineering; 2022, 71, 1; 159-174
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Moral Education Affinity from the Perspective of Psychology
Autorzy:
Jing, Zhang
Suting, Li
Powiązania:
https://bibliotekanauki.pl/articles/943813.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
moral education affinity
mental process
psychological mechanism
generation of affinity
cultivation of affinity
Opis:
Moral education affinity has a very important influence on the smoothdevelopment of moral education activities and the improvement of educationaleffectiveness. From the perspective of psychology, the needs and emotions ofthe educatees are its motivational mechanism, the will of the educatees is itsmaintenance mechanism, psychological compatibility is its guarantee mechanism,and the learning psychology of the educatees is the reinforcement mechanism.The generation of moral education affinity is the process of educators’ activeinterpersonal attraction, the application of positive psychological effect, the changeof educatees’ attitude, and the psychological exchange and interaction betweeneducators and educatees. The main way to cultivate moral education affinity isto fully pay attention to the needs or changes of the educatees, make efforts tostimulate and strengthen the learning motivation, maintain the main status androle of the educatees, and enhance the appeal and affinity of the educationalprocess through the unity of knowledge and action.
Źródło:
Ethics in Progress; 2020, 11, 1; 120-132
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Tradeoff between Growth and Environment: Evidence from China and the United States
Kompromis pomiędzy wzrostem a środowiskiem: Przykład Chin i USA
Autorzy:
Xu, Jing
Li, Jianjun
Powiązania:
https://bibliotekanauki.pl/articles/371378.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
economic growth
environmental protection
trade-off
individual preference
public opinion
rozwój ekonomiczny
ochrona środowiska
kompromis
indywidualne preferencje
opinia publiczna
Opis:
This paper empirically analyzes individual attitudes on the tradeoff between environment and economy, and factors that might influence such choice for two representative countries: China and the United States. Based on the World Value Survey, the Chinese are found more inclined to support environmental protection, while people from the United States choose economic growth as priority. Considering three sets of correlates of sociodemo-graphics, environmental attitude and social context, variables such as education, political affiliation and envi-ronmental consciousness show significance in influencing personal preferences, and the effect of health, age, employment and marital status demonstrates heterogeneity across countries. Such micro-level evidence on how the public weighs the economy versus environment can provide policy guidance for the government to better respond to public opinions.
Artykuł poddaje analizie indywidualne postawy odnoszące się do kompromisu pomiędzy środowiskiem a eko-nomią, a także czynniki, które mają wpływ na kształtowanie się takich postaw, w odniesieniu do dwóch ważnych krajów: Chin i USA. Według danych World Value Survey okazuje się, ze Chińczycy są bardziej skłonni wspierać ochronę środowiska, podczas gdy Amerykanie za priorytet uznają rozwój ekonomiczny. Uwzględniając trzy zbiory korelatów odnoszące się do socjodemografii, postaw wobec środowiska i kontekstu społecznego, zmienne takie jak edukacja, orientacja polityczna i świadomość ekologiczna, okazuje się, że te czynniki odgrywają istotne znaczenie w kształtowaniu indywidualnych priorytetów, a kwestie zdrowia, wieku, zatrudnienia i stanu cywilnego wypadają podobnie w różnych krajach. Dane z takiego mikro poziomu pokazują, jak ludzie indywidualnie rozstrzygają spór pomiędzy ekonomią a środowiskiem, co stanowi polityczną wskazówkę dla rządu, dzięki której można lepiej odpowiadać na nastroje społeczne.
Źródło:
Problemy Ekorozwoju; 2018, 13, 1; 15-20
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Spectral Characterizations of Graphs
Autorzy:
Huang, Jing
Li, Shuchao
Powiązania:
https://bibliotekanauki.pl/articles/31341668.pdf
Data publikacji:
2017-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Laplacian spectrum
adjacency spectrum
cospectral graphs
spectral characterization
Opis:
Several matrices can be associated to a graph, such as the adjacency matrix or the Laplacian matrix. The spectrum of these matrices gives some informations about the structure of the graph and the question “Which graphs are determined by their spectrum?” is still a difficult problem in spectral graph theory. Let $ \mathcal{U}_p^{2q} $ be the set of graphs obtained from $ C_p $ by attaching two pendant edges to each of $ q (q \le p) $ vertices on $ C_p $, whereas $ \mathcal{V}_p^{2q} $ the subset of $ \mathcal{U}_p^{2q} $ with odd $p$ and its $q$ vertices of degree 4 being nonadjacent to each other. In this paper, we show that each graph in $ \mathcal{U}_p^{2q} $, $p$ even and its $q$ vertices of degree 4 being consecutive, is determined by its Laplacian spectrum. As well we show that if $G$ is a graph without isolated vertices and adjacency cospectral with the graph in $ \mathcal{V}_p^{p−1} = \{ H \} $, then $ G \cong H $.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 3; 729-744
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Determinant of q-Distance Matrix of a Graph
Autorzy:
Li, Hong-Hai
Su, Li
Zhang, Jing
Powiązania:
https://bibliotekanauki.pl/articles/30147229.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
q-distance matrix
determinant
weighted graph
directed graph
Opis:
In this note, we show how the determinant of the q-distance matrix Dq(T) of a weighted directed graph G can be expressed in terms of the corresponding determinants for the blocks of G, and thus generalize the results obtained by Graham et al. [R.L. Graham, A.J. Hoffman and H. Hosoya, On the distance matrix of a directed graph, J. Graph Theory 1 (1977) 85-88]. Further, by means of the result, we determine the determinant of the q-distance matrix of the graph obtained from a connected weighted graph G by adding the weighted branches to G, and so generalize in part the results obtained by Bapat et al. [R.B. Bapat, S. Kirkland and M. Neumann, On distance matrices and Laplacians, Linear Algebra Appl. 401 (2005) 193- 209]. In particular, as a consequence, determinantal formulae of q-distance matrices for unicyclic graphs and one class of bicyclic graphs are presented.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 103-111
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Minimum Spectral Radius of Signless Laplacian of Graphs with a Given Clique Number
Autorzy:
Su, Li
Li, Hong-Hai
Zhang, Jing
Powiązania:
https://bibliotekanauki.pl/articles/30148000.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
clique number
kite graph
signless Laplacian
spectral radius
Opis:
In this paper we observe that the minimal signless Laplacian spectral radius is obtained uniquely at the kite graph $PK_{n-\omega,\omega}$ among all connected graphs with $n$ vertices and clique number $\omega$. In addition, we show that the spectral radius $\mu$ of $PK_{m,\omega}$ $(m\geq1)$ satisfies $$\frac{1}{2}(2\omega-1+\sqrt{4\omega^{2}-12\omega+17})\leq\mu\leq 2\omega-1.$$ More precisely, for $m>1$, $\mu$ satisfies the equation \[ \mu-\omega-\frac{\omega-1}{\mu-2\omega+3}=a_m\sqrt{\mu^2-4\mu}+\frac{1}{t_1}, \] where $a_m=\frac{1}{1-t_1^{2m+3}}$ and $t_{1}=\frac{\mu-2+\sqrt{(\mu-2)^{2}-4}}{2}$. At last the spectral radius $\mu(PK_{\infty,\omega})$ of the infinite graph $PK_{\infty,\omega}$ is also discussed.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 95-102
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic load analysis of the connecting bolts in a universal joint
Autorzy:
An, Yuchen
Liu, Jing
Li, Zengguang
Powiązania:
https://bibliotekanauki.pl/articles/2087028.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
dynamic loads
connecting bolts
universal joint
dynamic model
Opis:
Dynamic loads of the connecting bolts in a universal joint can greatly affect the bolt fatigue and fracture, as well as the machinery safety and stability. But few researches focused on those. To obtain the dynamic load characteristics of the connecting bolts in a universal joint, this paper established a flexible dynamic model for the connecting bolts. A multibody dynamic model of a universal joint is developed. The dynamic loads on the connecting bolts of the universal joint are analyzed. The influences of the preloads, speeds and loads are studied. The amplitude and frequency properities are obtained. The effect of the preload is small when the preload is in the range of 80%~120% of the standard value. The load and speed have great influence on the time- and frequency-domain dynamic loads of the bolts. The flexible dynamic model of the connecting bolt is closer to the actual situation than the rigid model since it can consider the preload and deformation of the bolts. This study can provide guidance for the fatigue life prediction of the universal shaft and its bolts.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 2; 211--225
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable Apparel Product Design Methods: a Fashion Brand Company Case Study
Metody zrównoważonego projektowania produktu w zakresie odzieży: studium przypadku firmy marki modowej
Autorzy:
Zheng, Jing
Li, Li
Gu, Wen
Liu, Gang Xiao
Powiązania:
https://bibliotekanauki.pl/articles/234207.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
sustainability
sustainable apparel
product design
clothing series design
fashion brand company
zrównoważony rozwój
zrównoważone projektowanie
produkty odzieżowe
projektowanie serii odzieży
marka modowa
Opis:
Fashion brand companies must fully consider all the three following aspects in apparel product design: perspectives, method and model (the key research questions proposed by this study), and practise in a sustainable way, with a focus on the combination of enterprise practices and sustainable development. In this paper, we make full use of the key elements of clothing design to establish a user-friendly theoretical model based on the concept of “clothing series design” and conducted the first trial at an appropriate company (Burberry). Then we applied this method derived from our model to the new products released as part of the 2019 Spring and Summer collection at a Chinese apparel company to test the stability of the method. The study proposed a new sustainable design method and received positive application results through the tests at Burberry and at a Chinese apparel company, which can be considered as one of the major contributions of this study.
Firmy modowe muszą w pełni uwzględnić wszystkie trzy aspekty projektowania produktów odzieżowych: perspektywy, metody i modele (kluczowe pytania badawcze zaproponowane w badaniu) i praktykować w sposób zrównoważony, koncentrując się na połączeniu praktyk przedsiębiorstw i zrównoważonego rozwoju. W artykule w pełni wykorzystano kluczowe elementy projektowania odzieży, tak aby stworzyć przyjazny dla użytkownika model teoretyczny oparty na koncepcji „projektowania serii odzieży” i przeprowadzono pierwszą próbę w firmie odzieżowej „Burberry”. Następnie zastosowano metodę pochodzącą z opracowanego modelu w nowych produktach wydanych w ramach kolekcji wiosenno-letniej 2019 w chińskiej firmie odzieżowej, w celu przetestowania stabilności tej metody. Badanie zasugerowało nową metodę zrównoważonego projektowania i uzyskało pozytywne wyniki zastosowania w testach w Burberry i chińskiej firmie odzieżowej, które można uznać za jeden z głównych wkładów tego badania.
Źródło:
Fibres & Textiles in Eastern Europe; 2020, 4 (142); 23-33
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Broadband convolutional scattering characteristics of all dielectric transmission Pancharatnam–Berry geometric phase metasurfaces
Autorzy:
Li, Yiyun
Jin, Yongxing
Jing, Xufeng
Shi, Lijiang
Li, Chenxia
Hong, Zhi
Powiązania:
https://bibliotekanauki.pl/articles/2086765.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
grating
metasurface
optical device
Opis:
In order to obtain the broadband scattering characteristics, we propose a superperiodic cell structure with all-dielectric material to construct Pancharatnam–Berry geometric phase encoding metasurfaces. Because we cannot design or prepare infinitesimal coding unit particles, according to the generalized Snell’s law, we can only obtain discrete scattering angle regulation for the basic coding metasurface sequence. In order to obtain multi-angle scattering characteristics, we introduce the Fourier convolution principle in digital signal processing on the Pancharatnam–Berry geometric phase encoding metasurfaces. By using the addition and subtraction operations on two encoding metasurface sequences, a new encoding metasurface sequence can be obtained with different deflection angle. Fourier convolution operations on the encoding metasurfaces can provide an efficient method in optimizing encoding patterns to achieve continuous scattering beams. The addition and subtraction methods are also applicable to the checkerboard coding mode. The combination of Fourier convolution principle and Pancharatnam–Berry phase coded metasurface in digital signal processing can realize more powerful electromagnetic wave manipulation capability.
Źródło:
Optica Applicata; 2022, 52, 2; 297--323
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of accuracy of simple methods for design and analysis of a blazed phase grating microstructure
Autorzy:
Wang, W.
Jing, X.
Zhao, J.
Li, Y.
Tian, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173533.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
grating
effective medium theory
scalar diffraction theory
Opis:
In order to precisely analyze and design the transmittance characteristics of a blazed grating, the validity of both the scalar diffraction theory and the effective medium theory is quantitatively demonstrated. By making a comparison of diffraction efficiencies calculated by the two simplified methods and Fourier modal method, the accuracy can be obtained. It is found that when the normalized period is more than three wavelengths of the incident light, the scalar diffraction theory is useful to calculate the transmittance of the blazed grating within the error of less than 3%. The validity of the scalar diffraction theory increases when the normalized period increases. Importantly, by considering the Fresnel reflection effect, the validity of scalar diffraction theory can be significantly enhanced. Furthermore, when no higher-order diffraction waves appear and only zeroth order diffraction wave propagates, the effective medium theory is accurate to compute the diffraction efficiency within the difference of less than 1% between the zeroth order effective medium theory and Fourier modal method. The polarization characteristics of the validity of effective medium theory are also quantitatively demonstrated. The validity of the two simplified theories is dependent on not only the normalized period of surface microstructure but also the normalized groove depth.
Źródło:
Optica Applicata; 2017, 47, 2; 183-198
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of efficiency for broadband unidirectional light scattering by core-shell nanoantennas
Autorzy:
Wang, Weimin
Wang, Xiaoyue
Huang, Biqun
Jing, Xufeng
Li, Chenxia
Powiązania:
https://bibliotekanauki.pl/articles/173186.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoparticles
core-shell nanocube
particle chain
broadband unidirectional scattering
Opis:
A core-shell nanocube antenna is proposed to numerically simulate broadband unidirectional scattering. Comparing the scattering of a dielectric nanocube and core-shell nanocube, it is found that the core-shell nanocube has a higher forward/backward ratio and better unidirectional scattering efficiency. In order to further enhance forward scattering efficiency and reduce the side-lobe of scattering, the particle chain of core-shell nanocubes is proposed by arranging multiple nanoparticles. It is possible to achieve better unidirectional scattering over a wide spectral range. In addition, we also numerically studied the effect of the gap between the particles and the radius of the metal core on unidirectional scattering. It is demonstrated that the optimal gap should be selected to achieve ideal unidirectional forward scattering. The unique optical properties of core-shell nanocubes have important practical applications particularly in the fields of nanoantennas, photovoltaic devices, and nanolasers that require reflection suppression.
Źródło:
Optica Applicata; 2019, 49, 4; 655-667
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on tensile fracture failure of a steel plate with a surface crack
Autorzy:
Chong, Zhewen
Tao, Jing
Xie, Yuehui
Wu, Dongrong
Li, Tao
Powiązania:
https://bibliotekanauki.pl/articles/2200891.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
steel plate
surface crack
stress intensity factor
SIF
fracture failure
Opis:
In order to study the effect of different surface crack parameters on the fracture failure of steel plate, the model was established by FEM. The results showed that the edge surface crack has the greatest influence on the fracture failure of the steel plate, and for non-edge surface cracks, the central surface crack has the greatest influence on the fracture failure of the steel plate. The larger the a/t and the smaller the a/c, the easier the steel plate fracture failure occurs. The a/c has a certain influence on the variation law of K and the position where Kmax appears.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 343--354
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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