Autor: Zhang, W.-B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Economic development and international and interregional tourism
Rozwój gospodarczy a turystyka międzynarodowa i międzyregionalna
Autorzy:: Zhang, W.-B.
Powiązania:: https://bibliotekanauki.pl/articles/2051177.pdf
Data publikacji:: 2020
Wydawca:: Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:: interregional trade
international tourism
services
growth
wealth accumulation
Opis:: Subject and purpose of work: Tourism was the fastest growing industry until the outbreak of Covid-2019. Nevertheless, there are a few studies on how the industry interacts with the rest of economies within a comprehensive analytical framework. The main concern of this study is how international and interregional tourism interacts with national economic development and economic structural change. Tourism and economic growth are investigated in a multi-regional small open economy which is perfectly competitive. Materials and methods: National economy consists of multiple regions and each region has three sectors: industry, service, and housing. Production side is the same as in the neoclassical growth theory. Households move freely between regions, equalizing utility level between regions by selecting housing, goods, tourism, and saving. A region’s amenity is endogenously related to the region’s population. Results: We explicitly solve the dynamics of the multi-regional economy. The system has a unique stable equilibrium point. Conclusions: We simulate the motion of the model and examine the effects of changes in the rate of interest, foreigners’ preference for visiting a region, a region ‘s total productivity of the service sector, domestic consumers’ preference for visiting a region, as well as the propensity to save, the propensity to consume regional services and housing
Źródło:: Economic and Regional Studies; 2020, 13, 4; 375-387
2083-3725
2451-182X
Pojawia się w:: Economic and Regional Studies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography
Autorzy:: Dai, B.
Lan, L.-G.
Zhang, W.-B.
Tian, Y.
Powiązania:: https://bibliotekanauki.pl/articles/358613.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: technology of materials
testing and analysis
compression molding
polymer bonded explosive
stress state
strain ellipsoid
X-ray tomography
Opis:: Precise measurement of the inner structural strain of polymer bonded explosive (PBXs) granules during compression molding is highly desirable in order to investigate the inner stress distribution field and its underlying generation mechanism, with the aim of improving the stress distribution uniformity. In this contribution, TATB-based (1,3,5-triamino-2,4,6-trinitrobenzene) PBX granules were formulated and the stress-strain state of the PBX granules during the warm molding process was analyzed. Strain markers were implanted at different locations and the deformation characteristics and regularity of the embedded spherical strain markers were obtained by X-ray micro-tomography. Thus the local strain states at different locations could be obtained, and the local stress state could be deduced. The results showed that axisymmetric deformation occurred in all of the strain markers, where the flat strain ellipsoids were mainly compressed uni-axially. In the central region, the stress was mainly in an axial direction, and the shear force was small. Not only axial stresses, but also large shear stresses in the surrounding region of the cylindrical grains were present. The stress gradient in the central region was greater than that in the surrounding region. The stress was greater in the surrounding region because this region was squeezed by the mold. The maximum strain degree was 44.8% larger than the minimum strain degree. The local stress increment in each region was quantified. The stress increments of the three axes were in the range 14.2-19.5 MPa. This study examined the feasibility of evaluating the inner stress–strain state of PBX granules in a quantitative manner, which is significant in determining the inner strain and stress distribution in PBX granules during the molding process.
Źródło:: Central European Journal of Energetic Materials; 2017, 14, 3; 688-707
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Design of brake force distribution model for front-and-rear-motor-drive electric vehicle based on radial basis function
Autorzy:: Sun, B.
Zhang, T.
Gao, S.
Ge, W.
Li, B.
Powiązania:: https://bibliotekanauki.pl/articles/224023.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electric vehicle
motor drive
front-and-rear-motor-drive
brakes force
brake force distribution
pojazd elektryczny
napęd silnikowy
napęd silnikowy przedni i tylny
siła hamowania
rozkład siły hamowania
Opis:: To achieve high-efficiency and stable brake of a front-and-rear-motor-drive electric vehicle (FRMDEV) with parallel cooperative braking system, a multi-objective optimal model for brake force distribution is created based on radial basis function (RBF). First of all, the key factors, which are the coefficient of brake force distribution between the front and rear shafts, the coefficient of brake force distribution at wheels, the coefficient of regenerative brake force distribution between front and rear axles, that influence the brake stability and energy recovery of the FRMDEV are analyzed, the fitness functions of brake stability and energy recovery are established. Secondly, the maximum allowed regenerative brake torque influenced by the state of charge of battery is confirmed, the correction model of the optimal distribution coefficient of regenerative brake force is created according to motor temperatures. Thirdly, based on HALTON sequence method, a two-factor database, vehicle velocity and brake strength, that characterizes vehicle operation is designed. Then an off-line response database of the optimal brake force distribution is established with the use of particle swarm optimization (PSO). Furthermore, based on hybrid RBF, the function model of the factor database and the response database is established, and the accuracy of the model is analyzed. Specially, the correlation coefficient is 0.995 and the predictive error variance is within the range between 0.000155 and 0.00018. The both indicate that the multi-objective distribution model has high accuracy. Finally, a hardware-in-loop test platform is designed to verify the multi-objective optimal brake force distribution model. Test results show that the real-time performance of the model can meet the demand of engineering application. Meanwhile, it can achieve both the brake stability and energy recovery. In comparison with the original brake force distribution model based on the rule algorithm, the optimized one proposed in this paper is able to improve the energy, recovered into battery, by 14.75%.
Źródło:: Archives of Transport; 2018, 48, 4; 87-98
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Applying Image Analysis for Automatic Density Measurement of High-tightness Woven Fabrics
Zastosowanie analizy obrazu do automatycznej oceny gęstości tkanin o dużej zwartości
Autorzy:: Pan, R.
Zhang, J.
Li, Z.
Gao, W.
Xu, B.
Li, W.
Powiązania:: https://bibliotekanauki.pl/articles/232730.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:: high-tightness woven fabric
image analysis
Fourier transform
threshold processing
image reconstruct
wysoka szczelność tkaniny
analiza obrazu
transformat Fouriera
rekonstrukcja obrazu
Opis:: To realise the density measurement of high-tightness woven fabrics, an efficient inspection method based on the structure relation is developed in this paper. The structure relations of typical HTWF, twill and satin weave are analyzed and a calculation equation of warp density is given with the fabric weave, weft density and wale density. In the experiment, the weft and wale densities are measured with the Fourier transform, image reconstruction and threshold processing based on separately captured images. The warp density is finally calculated based on the mean value of wale and weft density and the given calculation equation constructed with the weave pattern. The experimental results prove that the automatic measurement density system can realize the precise measurement of high-tightness woven fabric density with satisfactory precision and can replace the current manual analysis method.
Dla zrealizowania pomiarów gęstości tkanin o dużej zwartości opracowano metodę oceny opartą o zależności strukturalne. Zależności strukturalne typowych tkanin HTWF, o splocie skośnymi i satynowym analizowano i opracowano wzory dla obliczania gęstości osnowy, w zależności od gęstości wątku i gęstości prążków wypukłych. Przy przeprowadzeniu eksperymentu gęstości wątku i prążków wypukłych mierzono stosując transformatę Fouriera, rekonstrukcję obrazu i obliczenie wartości progowych wykorzystując indywidualnie otrzymane obrazy. Gęstość osnowy w efekcie jest obliczana w oparciu o średnią wartość gęstości prążków i wątku. Wyniki eksperymentalne potwierdziły, że automatyczny pomiar gęstości jest systemem, który może realizować precyzyjnie pomiar gęstości tkanin o dużej zwartości z zadowalającą dokładnością i w ten sposób może zastąpić dotychczas stosowane metody manualne.
Źródło:: Fibres & Textiles in Eastern Europe; 2016, 2 (116); 66-72
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study on recovery of lead, zinc, iron from jarosite residues and simultaneous sulfur fixation by direct reduction
Autorzy:: Wang, Y.
Yang, H.
Zhang, W.
Song, R.
Jiang, B.
Powiązania:: https://bibliotekanauki.pl/articles/110933.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: jarosite
direct reduction
recovery
valuable metal
sulfur fixation
Opis:: Jarosite residues, which are generated in a zinc production plant by a hydrometallurgical process, contain a large amount of valuable metal components. In this study, a method was proposed for the recovery of lead, zinc and iron from the residues and simultaneous sulfur fixation through direct reduction followed by magnetic separation. The influences of the roasting temperature, roasting time and the concentration of SO2 gas in the direct reduction process were researched in detail. Results showed that the volatilization rates of lead, zinc and sulfur were 96.97%, 99.89% and 1.09%, respectively, and the iron metallization rate was 91.97% under optimal reduction conditions; roasting temperature 1523 K for 60 min. The magnetic concentrate with the iron content of 90.59% and recovery rate of 50.87% was obtained from the optimal reduction product by grinding and magnetic separation. The optimum fineness for separation 96.56% less than 37 μm accounted with magnetic field strength 24 kA/m. The theoretical analysis was carried out by thermodynamics, X-ray powder diffraction, gas analysis and scanning electron microscopy.
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 2; 517-526
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Depth-resolved measurement of the compression displacement fields on the front and rear surfaces of an epoxy sample
Autorzy:: Zhang, W.
Dong, B.
He, Z.
Xie, S.
Zhou, Y.
Powiązania:: https://bibliotekanauki.pl/articles/174399.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: depth-resolved measurement
compression displacement field
wavenumber-scanning interferometry
epoxy
Opis:: Compression is one of the typical parameters measured in material mechanics. In this research, the compression displacement fields on the front and rear surfaces of an epoxy sample are measured by using a tilt depth-resolved wavenumber-scanning Michelson interferometer. The light source is a distributed feedback laser diode, the wavenumber of which can be modulated to about 1.017 × 10⁴ m^–1 by the temperature without mode hopping. A random-sampling Fourier transform is designed to evaluate the phase differences before and after the applied loads. Experimental results show that the depth-resolved measurement of the compression displacement field is of high accuracy. It can be used to analyze force propagation inside resin-based composites.
Źródło:: Optica Applicata; 2018, 48, 2; 311-323
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
Autorzy:: Xiao, X.
Xu, J.
Lu, B.
Cai, W.
Zhang, Y.
Shen, H.
Yang, B.
Xiang, W.
Powiązania:: https://bibliotekanauki.pl/articles/1399369.pdf
Data publikacji:: 2015-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.10.Fq
61.05.C-
78.20.Ci
78.70.Ps
Opis:: The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
Źródło:: Acta Physica Polonica A; 2015, 127, 3; 854-858
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Free-Carrier Plasmons as a Novel Tool in Semiconductor Physics
Autorzy:: Szuszkiewicz, W.
Bardyszewski, W.
Dingrong, Qian
Jiaming, Zhang
Julien, C.
Balkanski, M.
Witkowska, B.
Mycielski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1879491.pdf
Data publikacji:: 1991-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.45.Gm
72.30.+q
75.50.Pp
Opis:: It is demonstrated that free-carrier plasmons being well defined collective excitations of the electron gas in the range of small wave vectors can serve as a sensitive tool to investigate the optical processes related to the small momentum transfers. As an example the system HgSe:Fe is analysed both experimentally and theoretically.
Źródło:: Acta Physica Polonica A; 1991, 79, 1; 141-144
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Experimental Studies on Charging Operation of a Compact Repetitive Tesla Transformer
Autorzy:: Zhang, Z.
Zhang, J.
Yang, H.
Qian, B.
Meng, Z.
Li, D.
Wang, S.
Cao, Y.
Zhou, W.
Powiązania:: https://bibliotekanauki.pl/articles/1807860.pdf
Data publikacji:: 2009-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.30.Ng
84.30.Jc
84.30.Qi
84.70.+p
Opis:: Charging operations of a compact Tesla transformer were experimentally investigated, in single-shot and rep-rate (50 pps for 1 s) modes, respectively. The charging limitations were also explored. The experimental results were compared and analyzed. The maximum secondary charging voltages of the Tesla transformer were measured to be 380 kV and 300 kV in single-shot and rep-rate modes, respectively. The RMS pulse-to-pulse instability of the secondary charging voltage is generally less than 10% but increases with the increasing initial voltage across the primary capacitor. Since the secondary capacitor of the Tesla transformer is a pulse forming line (PFL), continued operation is possible if there is breakdown in the PFL. Furthermore, operation can even be continued under occasional breakdown for some pulses, without the effects on the operations of subsequent pulses.
Źródło:: Acta Physica Polonica A; 2009, 115, 6; 973-975
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Integrating Role of Sustainable Development Paradigm in Shaping the Human-landscape Relation
Integrująca rola paradygmatu zrównoważonego rozwoju w kształtowaniu relacji człowiek-krajobraz
Autorzy:: Bielińska, E. J.
Futa, B.
Baran, S.
Żukowska, G.
Pawłowska, M.
Cel, W.
Zhang, T.
Powiązania:: https://bibliotekanauki.pl/articles/370989.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:: rural areas
landscape protection
sustainable development
obszary wiejskie
ochrona krajobrazu
rozwój zrównoważony
Opis:: In order to implement the sustainable development paradigm more broadly, it is postulated to deviate from the simple protectionism, which is based on sectoral approach, in favour of systemic landscape management, which encompasses the human-landscape relations. The article presents the issues concerning rural landscape protection in Poland in relation to the assumptions of the European Landscape Convention. The aim of the article is to analyze the causes of inefficiency of the Polish rural landscape protection system.
W celu szerszego uwzględnienia paradygmatów zrównoważonego rozwoju postulowane jest odejście od ochraniarstwa, opartego na ujęciu sektorowym, na rzecz systemowego zarządzania krajobrazem, obejmującego relacje człowiek-krajobraz. W artykule przedstawiono zagadnienia dotyczące ochrony krajobrazu na obszarach wiejskich w Polsce odnosząc je do zapisów Europejskiej Konwencji Krajobrazowej. Celem artykułu jest analiza przyczyn nieskuteczności polskiego systemu ochrony krajobrazu na obszarach wiejskich.
Źródło:: Problemy Ekorozwoju; 2015, 10, 2; 159-168
1895-6912
Pojawia się w:: Problemy Ekorozwoju
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Measurement of the Indentation Modulus and the Local Internal Friction in Amorphous SiO2 Using Atomic Force Acoustic Microscopy
Autorzy:: Zhang, B.
Wagner, H.
Büchsenschütz-Göbeler, M.
Luo, Y.
Küchemann, S.
Arnold, W.
Samwer, K.
Powiązania:: https://bibliotekanauki.pl/articles/352901.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: amorphous materials
potential energy landscape
internal friction
atomic force acoustic microscopy
Opis:: For the past two decades, atomic force acoustic microscopy (AFAM), an advanced scanning probe microscopy technique, has played a promising role in materials characterization with a good lateral resolution at micro/nano dimensions. AFAM is based on inducing out-of-plane vibrations in the specimen, which are generated by an ultrasonic transducer. The vibrations are sensed by the AFM cantilever when its tip is in contact with the material under test. From the cantilver’s contactresonance spectra, one determines the real and the imaginary part of the contact stiffness k*, and then from these two quantities the local indentation modulus M' and the local damping factor Q_loc^-1 can be obtained with a spatial resolution of less than 10 nm. Here, we present measured data of M' and of Q_loc^-1 for the insulating amorphous material, a-SiO₂. The amorphous SiO₂ layer was prepared on a crystalline Si wafer by means of thermal oxidation. There is a spatial distribution of the indentation modulus M' and of the internal friction Q_loc^-1. This is a consequence of the potential energy landscape for amorphous materials.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 9-12
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Genome-wide association study of terpenoids in resin reveals candidate genes for resin yield in Pinus massoniana
Autorzy:: Bai, Q.
Zhang, Q.
Cai, Y.
Lian, H.
Liu, W.
Luo, M.
Zeng, L.
He, B.
Powiązania:: https://bibliotekanauki.pl/articles/2078149.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Pinus massoniana
GC-MS
terpenoid
GWAS
candidate gene
Opis:: Masson pine (Pinus massoniana) is an important species for resin tapping in China. Molecular assisted selection (MAS) has been gradually introduced in to the selection and breeding of masson pine. Until now, the lack of connection between genome information and phenotypic data has hindered the breeding and selection of important chemical compounds of xylem resin. In this study, gas chromatography mass spectrometer (GC-MS) was employed for qualitative and quantitative analysis of chemical compounds of resin collected from 69 masson pine germplasm resources. Then, genome-wide association study (GWAS) was conducted for the terpenoids with higher heritability. A total of 15 primary compounds, including six diterpenes and nine monoterpenes/sesquiterpenes, were detected from xylem resin. By using five GWAS methods, 42 associated SNPs were identified from these masson pines. The P. taeda genome database was used for detecting candidate genes related to the associated SNPs. By using transcriptome data, several members of PKc_like super family, Cytochrome P450, AP2-ERF, F-box, and ABC transporter were found to be highly expressed in the masson pines with higher resin-yielding capacity. The terpenoids associated SNPs can be directly used for MAS. These candidate genes, especially the two F-box members, will contribute to the study of terpenoid biosynthesis mechanisms in the future.
Źródło:: Dendrobiology; 2020, 84; 109-121
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Teaching Machines on Snoring : A Benchmark on Computer Audition for Snore Sound Excitation Localisation
Autorzy:: Qian, K.
Janott, C.
Zhang, Z.
Deng, J.
Baird, A.
Heiser, C.
Hohenhorst, W.
Herzog, M.
Hemmert, W.
Schuller, B.
Powiązania:: https://bibliotekanauki.pl/articles/177964.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: snore sound
obstructive sleep apnea
acoustic features
machine learning
Opis:: This paper proposes a comprehensive study on machine listening for localisation of snore sound excitation. Here we investigate the effects of varied frame sizes, and overlap of the analysed audio chunk for extracting low-level descriptors. In addition, we explore the performance of each kind of feature when it is fed into varied classifier models, including support vector machines, k-nearest neighbours, linear discriminant analysis, random forests, extreme learning machines, kernel-based extreme learning machines, multilayer perceptrons, and deep neural networks. Experimental results demonstrate that, wavelet packet transform energy can outperform most other features. A deep neural network trained with subband Energy ratios reaches the highest performance achieving an unweighted average recall of 72.8% from four types for snoring.
Źródło:: Archives of Acoustics; 2018, 43, 3; 465-475
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Vertebral fusion in two Early Jurassic sauropodomorph dinosaurs from the Lufeg Formation of Yunnan, China
Autorzy:: Xing, L.
Rothschild, B.M.
Ran, H.
Miyashita, T.
Scott Persons IV, W.
Sekiya, T.
Zhang, J.
Wang, T.
Dong, Z.
Powiązania:: https://bibliotekanauki.pl/articles/19988.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:: Here we describe two instances of pathological vertebral fusion in two genera of sauropodomorph dinosaurs from the Early Jurassic Lufeng Formation in Yunnan, China. The first is a specimen, of Lufengosaurus huenei with two fused cervical vertebrae, and the other is a specimen of the Lufeng basal sauropod, with two fused caudal vertebrae. Both pathologies are consistent with spondyloarthropathy and represent the earliest known occurrence of that disease in dinosaurs. The two specimens affirm that early dinosaurs suffered from the same bone diseases as living vertebrates. Spondyloarthropathy in these dinosaurs may have been induced by long-term mechanical stress, such as weight bearing, and/or limited motion at the joint that would otherwise have inhibited such remodeling. In both cases, surface remodeling suggests that the animals survived well beyond the initiation of spondyloarthropathy.
Źródło:: Acta Palaeontologica Polonica; 2015, 60, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki