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Wyświetlanie 1-15 z 828
Tytuł:
“CRAWL.PL” Measuring Statistical and Structural Properties of the Polish Web : Technical Report
Autorzy:
Castillo, C.
Starosta, B.
Sydow, M.
Powiązania:
https://bibliotekanauki.pl/articles/92889.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
web crawling
web graph
Page rank
Polish Web
Opis:
This document summarizes the results of an experiment made in the Polish-Japanese Institute of Information Technology, Warsaw, Poland during autumn 2005 and winter 2006. The goal of the project was to collect and analyze large portion of Polish Web documents in order to characterize the structure and other properties of the „.pl” domain. Up to the knowledge of the authors, it was the first publicly reported research experiment of this kind over the Polish Web. The following sections include information about downloaded Web pages, Web sites, and their characteristics. We also present various statistics concerning hosts and domains, as well as the link structure. Among the results of the experiment are the first data sets representing graphs of the Polish Web which will be publicly available for other researchers.
Źródło:
Studia Informatica : systems and information technology; 2007, 1(8); 43-73
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“Teaching in university science laboratories. Developing best practice” kurs on-line dla nauczycieli akademickich prowadzących zajęcia laboratoryjne (opis przypadku)
“Teaching in university science laboratories. Developing best practice” an on-line course for university teachers conducting laboratory classes (a case study)
Autorzy:
Brouwer, N.
Byers, B.
Fleerackers, G.
Maciejowska, I.
Mcdonnell, C.
Mocerino, M.
Powiązania:
https://bibliotekanauki.pl/articles/267536.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
MOOC
zajęcia laboratoryjne
rozwój kompetencji dydaktycznych
nauczyciele akademiccy
university laboratory
CPD
lecturer
TA
Opis:
Grupa chemików, specjalistów z dydaktyki chemii oraz technologii informacyjnych, współpracujących w ramach sieci ECTN, opracowała i przeprowadziła w semestrze zimowym roku 2017/18 pilotaż MOOC, którego celem było zbadanie możliwości rozwoju tym sposobem kompetencji dydaktycznych nauczycieli akademickich i doktorantów z kierunków przyrodniczych, prowadzących zajęcia laboratoryjne. Zarówno przygotowanie kursu, jak i jego prowadzenie na platformie Coursera pokazało zalety pracy dydaktycznej w międzynarodowym środowisku. Jednocześnie stwierdzono, że w polskich warunkach najlepszym rozwiązaniem jest jednak nauczanie mieszane oraz udział prowadzącego kurs w aktywnościach na platformie.
A group of chemists, chemical education researchers and CPD experts, cooperated within the working group ‘Lecturing Qualifications and Innovative Teaching Methods’ of the ECTN (European Chemistry Thematic Network) to develop and conduct a pilot for a MOOC entitled “Teaching In University Science Laboratories. Developing Best Practice”, during the winter semester 2017/18. The purpose of this piloting phase was to explore opportunities for developing competences in conducting laboratory classes in academic teachers and PhD students (TA). The goals for the course were: to identify the purposes of implementing laboratory classes in higher education; to compare different types of laboratory sessions with respect to their aim and expected learning outcomes; to provide strategies on how to increase student engagement; to develop strategies to cope with different levels of pre-knowledge and lab experience within a group of students: to develop effective questions to probe student understanding of laboratory practice; to create a rubric for assessing a student performing a lab activity and subsequently submitting a report and finally – to reflect on how this course can impact on your own teaching practice. Both the preparation of the course and its implementation on the Coursera platform demonstrated advantages of educational work in an international environment. At the same time, it was found that for the Polish participants, a blended learning format with the participation of a course instructor in the activities on the platform was likely to produce the best results.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2018, 58; 11-14
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$K_{β}//K_{α}$ X-Ray Intensity Ratios for Co, Ni, Cu, and~Zn in Phthalocyanines Complexes
Autorzy:
Baltas, H.
Ertugral, B.
Kantar, C.
Sasmaz, S.
Yılmaz, E.
Cevik, U.
Powiązania:
https://bibliotekanauki.pl/articles/1504553.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.Rj
32.80.-t
31.70.-f
Opis:
The $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Cu and Zn in metalophthalocyanines complexes have been studied. Co, Ni, Cu and Zn elements have been excited by using 59.5 keV photons emitted by 50 mCi $\text{}^{241}Am$ radioactive source. K X-rays emitted by samples have been counted by a Si(Li) detector with resolution 0.16 keV at 5.9 keV. We have found that $K_{β} // K_{α}$ X-ray intensity ratios of Co, Ni, Zn, and Cu complexes have changed depending on chemical structures of Co, Ni, Zn and Cu. The measured values have been compared with the theoretical predictions and experimental values of pure elements.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 764-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Electron Gas in Non-Uniform Magnetic Fields
Autorzy:
Gallagher, B. L.
Kubrak, V.
Rushforth, A.
Neumann, A. C.
Edmonds, K. W.
Main, P. C.
Henini, M.
Marrows, C. H.
Hickey, B. J.
Thoms, S.
Dahlberg, D. E.
Powiązania:
https://bibliotekanauki.pl/articles/2014148.pdf
Data publikacji:
2000-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Jt
73.20.Dx
73.23.Ad
73.50.Fq
Opis:
We present a review of some of our recent experimental work on hybrid ferromagnet/semiconductor devices in which 2D electrons propagate through magnetic barriers, periodic magnetic modulations, and random magnetic fields.
Źródło:
Acta Physica Polonica A; 2000, 98, 3; 217-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Case Study of Explosion A Single Solar Burst Type III and IV Due to Active Region AR1890
Autorzy:
Hamidi, Z. S.
Ibrahim, M. B.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412554.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar burst
III
IV
radio region
X-ray region
solar flare
active region
Opis:
Using data from a BLEIN Callisto site, we aim to provide a comprehensive description of the synopsis formation and dynamics of a a single solar burst type III and IV event due to active region AR1890. This eruption has started since 14:15 UT with a formation of type III solar burst. To investigate the importance of the role of type III solar burst can potentially form a type IV solar burst, the literature review of both bursts is outlined in detailed. The orientation and position of AR1890 make the explosion of a class C-solar flare is not directly to the Earth. Nevertheless, it is clear that the interactions of others sunspots such as AR1893,AR1895,AR1896, AR1897 and AR1898 should be studied in detail to understand what makes the type III burst formed before the type IV solar burst.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 171-180
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study on Ex-Situ & In-Situ Formed Metal Matrix Composites
Autorzy:
Gobalakrishnan, B.
Rajaravi, C.
Udhayakumar, Gobikrishnan
Lakshminarayanan, P. R.
Powiązania:
https://bibliotekanauki.pl/articles/2203734.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MMCs
Al-SiC
Al-TiB2
extrusion
heat treatment
mechanical properties
microstructure
Opis:
An attempt has been made to synthesize the aluminium based ex-situ (Al-SiC) and in-situ (Al-TiB2) formed metal matrix composites with varying weight percentage of reinforcement contents such as 4wt.%, 6wt.% and 8wt.%. Synthesized composites were subjected to a cold extrusion process followed by heat treatment according to the ASTM B 918-01 standards. The mechanical properties of in-situ composites were evaluated as per the ASTM guidelines and compared with ex-situ formed composites and base metal properties. Superior properties were noticed in the in-situ formed composites and the mechanical properties such as yield strength, Ultimate tensile strength (UTS) and Hardness for both ex-situ and in-situ composites were found to increase with increasing the reinforcement addition. Cold extruded Al-8 wt.% SiC composite properties such as hardness, yield strength and UTS are 87 RB, 152 MPa, 216 MPa respectively. Whereas, for Al-8 wt.% TiB2 composite, the corresponding properties are 94 RB, 192 MPa, 293 MPa. The morphology of the composites is analysed by Optical and Scanning Electron Microscopic (SEM) whereas presence of reinforcement particles such SiC and TiB2 along with intermetallic phases Mg2Si and Al5FeSi are confirmed by EDX, XRD and Element Mapping analyses.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 171--185
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of two enzymatic methods of clinical dextran production
Autorzy:
Sikora, B.
Kubik, C.
Bielecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/410412.pdf
Data publikacji:
2017
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
dextransucrase
dextranase
acceptor dextrans
clinical dextran
dekstranosacharaza
dekstranaza
dekstran kliniczny
Opis:
The aim of this study was to evaluate and compare of the two enzymatic methods of clinical dextran production were compared. The reactions were performed at 30°C and pH 5.4 in solutions containing different amounts of sucrose, using dextransucrase (DS, in the presence of dextranase (D) (method 1) or acceptor dextrans (method 2). The activity of Leuconostoc mesenteroides L dextransucrase (DS), which converts sucrose to dextran, was 0.4 U ml-1 in both the methods. As much as 53-56% of clinical dextran fractions were obtained for 28 h from 10% sucrose solutions, which contained 1.5% or 2.5% acceptor dextrans with molecular mass of 10 and 15 kDa, respectively. Approximately 50% of these fractions was obtained (also in 28 h) from 10% sucrose solutions by using 0.004 U ml-1 of DN, added to reaction mixtures 5 h later than our experiments indicate that the clinical dextran can be efficiently produced by using both the compared methods, which employ either acceptor dextrans with definite molecular mass, or the dextranase. Because consumption of the latter enzyme is rather small, and it is easily available, thus this method should be attractive for clinical dextran manufacturers.
Źródło:
Biotechnology and Food Science; 2017, 81, 2; 125-136
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector
Autorzy:
Mohammed, Muhsin
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shivani, ---
Skurzok, M.
Silarski, M.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030045.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Fr
41.75.Ht
77.22.Ej
36.10.Dr
85.75.Mm
87.57.uk
Opis:
A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1486-1489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Methodology for Long-Term Analysis of Innovative Signalling Systems on Regional Rail Lines
Autorzy:
D’Acierno, L.
Botte, M.
Di Salvo, C.
Caropreso, C.
Montella, B.
Powiązania:
https://bibliotekanauki.pl/articles/136192.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
microscopic rail system simulation
operational cost definition
public transport management
signalling system
travel demand estimation
Opis:
A rail system may be considered a useful tool for reducing vehicular flows on a road system (i.e. cars and trucks), especially in high-density contexts such as urban and metropolitan areas where greenhouse gas emissions need to be abated. In particular, since travellers maximise their own utility, variations in mobility choices can be induced only by significantly improving the level-of-service of public transport. Our specific proposal is to identify the economic and environmental effects of implementing an innovative signalling system (which would reduce passenger waiting times) by performing a cost-benefit analysis based on a feasibility threshold approach. Hence, it is necessary to calculate long-term benefits and compare them with intervention costs. In this context, a key factor to be considered is travel demand estimation in current and future conditions. This approach was tested on a regional rail line in southern Italy to show the feasibility and utility of the proposed methodology.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 3; 77-85
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-agent brokerage platform for media content recommendation
Autorzy:
Veloso, B.
Malheiro, B.
Burguillo, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/330094.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
multi agent computing
brokerage platform
media content personalisation
recommendation
przetwarzanie wieloagentowe
platforma maklerska
Opis:
Near real time media content personalisation is nowadays a major challenge involving media content sources, distributors and viewers. This paper describes an approach to seamless recommendation, negotiation and transaction of personalised media content. It adopts an integrated view of the problem by proposing, on the business-to-business (B2B) side, a brokerage platform to negotiate the media items on behalf of the media content distributors and sources, providing viewers, on the business-to-consumer (B2C) side, with a personalised electronic programme guide (EPG) containing the set of recommended items after negotiation. In this setup, when a viewer connects, the distributor looks up and invites sources to negotiate the contents of the viewer personal EPG. The proposed multi-agent brokerage platform is structured in four layers, modelling the registration, service agreement, partner lookup, invitation as well as item recommendation, negotiation and transaction stages of the B2B processes. The recommendation service is a rule-based switch hybrid filter, including six collaborative and two content-based filters. The rule-based system selects, at runtime, the filter(s) to apply as well as the final set of recommendations to present. The filter selection is based on the data available, ranging from the history of items watched to the ratings and/or tags assigned to the items by the viewer. Additionally, this module implements (i) a novel item stereotype to represent newly arrived items, (ii) a standard user stereotype for new users, (iii) a novel passive user tag cloud stereotype for socially passive users, and (iv) a new content-based filter named the collinearity and proximity similarity (CPS). At the end of the paper, we present off-line results and a case study describing how the recommendation service works. The proposed system provides, to our knowledge, an excellent holistic solution to the problem of recommending multimedia contents.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 513-527
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Generation of Variable Temperature Scanning Probe Microscope for Spectroscopy
Autorzy:
Chomiuk, P.
Uder, B.
Bettac, A.
Köble, J.
Tröppner, C.
Powiązania:
https://bibliotekanauki.pl/articles/1198427.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
73.20.At
Opis:
In this contribution we present the design and first results of a new generation of variable temperature scanning probe microscope that has been developed to enhance the performance in tunnelling spectroscopy at lower temperatures. Its performance has been proven with imaging and spectroscopy experiments on the well known Si(111), Au(111), and Ag(111) surfaces.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1049-1051
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A North American ammonite fauna from the late Middle Turonian of Vaucluse and Gard, southern France: the Romaniceras mexicanum, Prionocyclus hyatti and Coilopoceras cf. springeri association
Autorzy:
Amédro, F.
Robaszynski, F.
Matrion, B.
Devalque, C.
Powiązania:
https://bibliotekanauki.pl/articles/138974.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cretaceous
Turonian
Ammonites
Transgressive event
migration
North America
Southern France
kreda
turon
amonity
migracja
Ameryka Północna
Francja Południowa
Opis:
An unusual, exotic, ammonite fauna including Romaniceras mexicanum Jones, 1938, Prionocyclus hyatti (Stanton, 1894) and Coilopoceras cf. springeri Hyatt, 1903 is recorded from the late Middle Turonian of Vaucluse and Gard, southern France. It is the first record of this ammonite association outside the Gulf Coast region and the Western Interior of the United States of North America. Up to present, these species were considered as endemic to the Western Interior sea-way. The migration of numerous ammonites from North America to western Europe during the late Middle Turonian suggests it is linked to a transgressive event or to a short sea-level high.
Źródło:
Acta Geologica Polonica; 2016, 66, 4; 729-736
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel proteomic approach to analyse methionine oxidation reveals protein oxidation patterns in Arabidopsis seeds
Autorzy:
Meimoun, P.
Valot, B.
Job, D.
Bailly, C.
Powiązania:
https://bibliotekanauki.pl/articles/80575.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
reactive oxygen species
nucleic acid
protein
oxidation
methionine
methionine sulphoxide reductase
protein oxidation
Arabidopsis
seed
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Probabilistic Model of Assessment of Level Network Functionality
Probabilistyczny model oceny funkcjonalności osnowy wysokościowej
Autorzy:
Wolski, B.
Toś, C.
Powiązania:
https://bibliotekanauki.pl/articles/385677.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
osnowa niwelacyjna
niezawodność
ocena funkcjonalności
użytkowalność osnowy
levelling network
reliability
functionality assessment
usability of network
Opis:
Zagadnienie stabilności punktów wysokościowych daje się opisać w podejściu fenomenologicznym za pomocą modelu niezawodności. Praktycznym efektem analizy niezawodności jest prognoza destrukcji badanej osnowy. Identyfikacja procesu degradacji jako funkcji czasu umożliwia racjonalne planowanie pomiarów aktualizujących i modernizacyjnych sieci niwelacyjnych. Newralgicznym elementem oceny stanu osnowy niwelacyjnej jest pozyskanie danych spełniających wymogi podejścia niezawodnościowego. Procedurę tę oraz algorytm analizy niezawodnościowej przedstawiono w artykule. Problem zilustrowano przykładami badań dwóch osnów zastabilizowanych na obszarach o gęstej zabudowie.
The question of stability of elevation points can be described at the phenomenological approach by means of a reliability model. The practical effect of analysis is a prediction of the destruction of the level network in the researched areas. The identifi cation of the degradation process as a function of time enables the rational planning of updating measurements. The neuralgic point of the question is an acquisition of data which fulfills the reliability approach demands. This question as well as the procedure of the reliability analysis method of data is presented in this paper. In the examples of two cases the authors present the results of research on control level network situated in urban areas in compact sett lement conditions.
Źródło:
Geomatics and Environmental Engineering; 2017, 11, 2; 73-83
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of investigations into the management of gangue in the flotation of platinum group minerals
Autorzy:
O’Connor, C.
Wiese, J.
Corin, K.
McFadzean, B.
Powiązania:
https://bibliotekanauki.pl/articles/110708.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Depressants
chromite
copper sulphate
platinum group minerals
Opis:
The Bushveld Complex of South Africa contains almost 90% of the world’s reserves of platinum group minerals (PGMs). In the flotation of PGMs, there are significant challenges arising from the need to treat ever-decreasing grades of the relevant ore deposits. The major challenge in the flotation of these ore bodies is the control and management of the gangue minerals, particularly silicates such as orthopyroxene, plagioclase feldspar, and pyroxene which are often rimmed with talc which makes them naturally floatable. It has been shown that various polysaccharide depressants such as CMC and guar have different properties in terms of depressing the gangue minerals. Since the PGMs are often associated with sulphides, copper sulphate is widely used as an activator in PGM flotation but can inadvertently activate the gangue minerals as well as reduce the recovery of PtTe2 which accounts for up to 40% of the Pt in the Platreef ore body. Depressants also reduce the mass of solids reporting to the froth and can thus destabilize the froth. This effect on the froth can be mitigated by using higher frother dosages or water of higher ionic strength. In summary due care needs to be taken to carry out site test work to develop an optimum ratio of collector, frother, activator and depressant to ensure that the highest grades and recoveries of the PGEs are obtained while reducing depressant dosage as much as possible. Chromite recoveries can be reduced through the application of gravity separation or reducing entrainment through reduced water recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1107-1115
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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