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Wyświetlanie 1-15 z 55
Tytuł:
Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray
Dynamika kwitnienia, nektarowanie i oblot przez owady Phacelia campanularia A. Gray
Autorzy:
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/26779.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
flowering dynamics
nectar secretion
insect visitation
Phacelia campanularia
Hydrophyllaceae
nectar production
flower
sugar yield
Opis:
In the years 2004-2006, flowering dynamics and nectar secretion of Phacelia campanularia A. Gray flowers as well as the insect visitation rate were studied in the climatic conditions of Lublin, Poland. The flowering of phacelia started in the middle of June and lasted for 1.5 up to 2 months. Full bloom occurred between the third and fifth week of the flowering period of this taxon. For the study period, the average weight of nectar produced by 10 flowers was 75.64 mg, weight of sugars 11.31 mg, while their concentration in the nectar was 20.2%. Among the entomofauna foraging on the flowers of phacelia, honey bees were predominant, with their proportion among the pollinators accounting for 84.8%.
Źródło:
Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical and graphical modelling of aerobatic flight trajectories
Autorzy:
Linka, A.
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/245876.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mathematical models
flight trajectory
aerobatics
flight safety
glider aerobatics
Opis:
The article presents the current state of knowledge related to mathematical and graphical modelling of aircraft trajectories, particularly those of aerobatic flights. The first part of the article is an introduction to the subject of training and aerobatic flight. In the second chapter of this work, the authors describe the basic definitions related to mathematical modelling, rules for glider aerobatics (rules for the pilots and for the judges) and specification of navigation software, which is using during competitions. In the further part of the article the authors present example possibilities of application of the mathematical modelling tools in General Aviation and describe the possibilities of implementing the obtained models in selected navigation and tracking systems. In the same part of the article there is a description of the AeroSafetyShow Demonstrator PL – an intelligent system of flights supervision and safety (ASSD+PL), which will be using to compare the real flights trajectory and the models build trough the mathematical software. ASSD+PL in also only tracking system using by the judges at glider aerobatic World Championships. The aim of this article is to validate the applicability of the system comparing to the actual aircraft trajectory with the models referred to as ‘ideal’ for aerobatic purposes.
Źródło:
Journal of KONES; 2017, 24, 3; 181-187
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Python programming language as a tool for creating three-dimensional figures of glider aerobatics
Autorzy:
Linka, A.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/241817.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aerobatics
general aviation
fly trajectory
mathematical programming
Opis:
The article presents the possibilities and validity of the implementation in the field of developing mathematical models for aerobatics trajectory. Proposing a catalogue of three-dimensional figures and those described mathematically will allow improving judging and scoring level, as well as the art of piloting in aerobatics. In the first chapter, article describes the processes of aerobatic flight, judge evaluation method and the current state of technology supporting the scoring process. The second chapter presents the capabilities of the Python programming language, which will be a tool for the construction of three-dimensional models. The third chapter of this article is a description of the comparative analysis of ideal trajectories and obtained in real flight. This chapter also demonstrates the validity and necessity of introducing new standards for assessing aerobatic flights. Aerobatics flights and judging, intelligent system to control aerobatic flights, three-dimensional models of aerobatic flights are presented in the article. The article concerns on use modern technologies to support the judges during the competition. The introduction of ASSD + PL system and the possibility of implementing designed models of aerobatic figures open new paths for improving the art of pilotage and arbitration.
Źródło:
Journal of KONES; 2018, 25, 4; 247-253
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automation of training methods and judging of aerobatic flights
Autorzy:
Linka, A.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/245092.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aerobatics
aerobatic training
aerobatic judging
on-board transmitters
supervision system
Opis:
The article presents the specificity of aerobatic operations that use on-board transmitters to improve the quality of training and judging in this sport area. The first chapter of this work is an introduction to the topic under discussion and the second chapter describes the principles of aerobatic competitions, methods of judge evaluations and the regulations related to the correctness of the figure performance by the pilots. The third chapter contains information on the AeroSafetyShow Demonstrator+PL system (ASSD+PL) used to carry out active supervision over flights in general aviation (especially in gliders and airplanes aerobatic). In the fourth chapter of the article, the possibilities of application of the ASSD+PL system functionalities were described which could improve the quality of training and judge evaluations. The Polish measurement system is actually an only electronic system, which is accepted and respected by the aerobatic judges all over the Europe. Functionalities of the ASSD+PL are used by them to control and sum up all the forbidden crosses the box. The pilot flying too low can be even disqualified. Application interface can be also transmitted in the real time to the big screen as well for the judges, as for the wide spectators watching the competitions flights.
Źródło:
Journal of KONES; 2017, 24, 4; 165-171
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flowering of siberian peashrub (Caragana arborescens Lam.) and its forage value to pollinating insects
Kwitnienie i wartość pożytkowa karagany syberyjskiej (Caragana arborescens Lam.) dla owadów zapylających
Autorzy:
Stawiarz, E.
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/27976.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Under the conditions of Lublin (central-eastern Poland), observations were conducted on the flowering of Caragana arborescens shrubs for two growth seasons as well as nectar and pollen production by the flowers of this species was investigated. The flowering period of Caragana arborescens began at the turn of April and May and lasted for 24 days, while for a single flower it was 6.30 ± 0.79 days. The average weight of nectar, sugars and pollen produced by 10 Siberian peashrub flowers was, respectively: 46.70 ± 8.39 mg, 22.79 ± 6.10 mg, and 4.45 ± 0.34 mg. The nectar sugar concentration amounted 49.60 ± 10.08%. Pollen grains reached average dimensions of 21.94 ± 0.76 μm x 21.52 ± 0.71 μm. During a growing season, one Caragana arborescens shrub can provide on average 101.8 g of nectar, 49.7 g of sugars, and 9.7 g of pollen.
W warunkach Lublina (środkowo-wschodnia Polska) prowadzono przez dwa sezony wegetacyjne obserwacje kwitnienia krzewów Caragana arborescens oraz badania obfitości nektarowania i pylenia jej kwiatów. Okres kwitnienia gatunku rozpoczynał się na przełomie kwietnia i maja i trwał średnio 24 dni, pojedynczego kwiatu 6,3 dnia. średnia masa nektaru, cukrów oraz pyłku wytwarzana przez 10 kwiatów karagany syberyjskiej osiągnęła odpowiednio: 46,70 mg, 22,79 mg oraz 4,45 mg. Średnia koncentracja cukrów w nektarze wyniosła 49,6%. Ziarna pyłku osiągały średnie wymiary 21,94 μ m x 21,52 μ m. Jeden krzew Caragana arborescens może dostarczyć w sezonie wegetacyjnym średnio 101,8 g nektaru, 49,7 g cukrów i 9,7 g pyłku.
Źródło:
Acta Agrobotanica; 2014, 67, 3
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamical systems as the main instrument for the constructions of new quadratic families and their usage in cryptography
Autorzy:
Ustimenko, V.
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/106218.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
discrete logarithm
cryptographic algorithm
cryptography
public key cryptography
Opis:
Let K be a finite commutative ring and f = f(n) a bijective polynomial map f(n) of the Cartesian power K^n onto itself of a small degree c and of a large order. Let f^y be a multiple composition of f with itself in the group of all polynomial automorphisms, of free module K^n. The discrete logarithm problem with the pseudorandom base f(n) (solvef^y = b for y) is a hard task if n is sufficiently large. We will use families of algebraic graphs defined over K and corresponding dynamical systems for the explicit constructions of such maps f(n) of a large order with c = 2 such that all nonidentical powers f^y are quadratic polynomial maps. The above mentioned result is used in the cryptographical algorithms based on the maps f(n) – in the symbolic key exchange protocols and public keys algorithms.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2012, 12, 3; 65-74
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the key exchange and multivariate encryption with nonlinear polynomial maps of stable degree
Autorzy:
Ustimenko, V.
Wroblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/106224.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
key exchange
polynomial mapping
stable degree
Opis:
We say that the sequence gn, n≥3, n→∞ of polynomial transformation bijective mapsof free module Kgn over commutative ring K is a sequence of stable degree if the order of gn is growing with n and the degree of each nonidentical polynomial map of kind gkn is an independent constant c. Transformation b = τgnkτ−1, where τ is the affine bijection, n is large and k is relatively small, can be used as a base of group theoretical Diffie-Hellman key exchange algorithm for the Cremona group C(Kn) of all regular automorphisms of Kn. The specific feature of this method is that the order of the base may be unknown for the adversary because of the complexity of its computation. The exchange can be implemented by tools of Computer Algebra (symbolic computations). The adversary can not use the degree of right handside in bx = d to evaluate unknown x in this form for the discrete logarithm problem. In the paper we introduce the explicit constructions of sequences of elements of stable degree for the cases c = 3 and c = n+2/4 for each commutative ring K containing at least 3 regular elements and discuss the implementation of related key exchange and multivariate map algorithms.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2013, 13, 1; 63-80
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On New Examples of Families of Multivariate Stable Maps and their Cryptographical Applications
Autorzy:
Wróblewska, A.
Ustimenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/106283.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
multivariate map
cryptographical application
stable element
invertible decomposition
Opis:
Let K be a general finite commutative ring. We refer to a family gn, n = 1, 2, . . . of bijective polynomial multivariate maps of Kn as a family with invertible decomposition gn = gn1 gn2 . . . g gnk, such that the knowledge of the composition of gni allows computation of gni for O(ns) (s > 0) elementary steps. A polynomial map g is stable if all non-identical elements of kind gt, t > 0 are of the same degree. We construct a new family of stable elements with invertible decomposition. This is the first construction of the family of maps based on walks on the bipartite algebraic graphs defined over K, which are not edge transitive. We describe the application of the above mentioned construction for the development of stream ciphers, public key algorithms and key exchange protocols. The absence of edge transitive group essentially complicates cryptanalysis.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2014, 14, 1; 19-36
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flowering abundance and pollen productivity of Ligularia clivorum Maxim. And Ligularia przewalskii Maxim.
Obfitość kwitnienia i wydajność pyłkowa Ligularia clivorum Maxim. i Ligularia przewalskii Maxim.
Autorzy:
Wróblewska, A.
Stawiarz, E.
Powiązania:
https://bibliotekanauki.pl/articles/11542336.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Ligularia genus includes species cultivated in house gardens and urban parks as an attractive ornamental plants. During flowering period their flower heads may provide pollen food for pollinators. In the period 2004–2008, the present study investigated the abundance of flowering and pollen production of two Ligularia species as a source of pollen for insects. Under the conditions of Lublin, the onset of flowering of L. clivorum occurs in the second half of July, whereas L. przewalskii starts to bloom already in the last week of June. Depending on species and weather conditions, the period of flowering of L. clivorum lasted 48–67 days, while in the case of L. przewalskii from 29 to 38 days. In both taxa, female ray florets and bisexual disc florets are found in capitulum inflorescences. The weight of pollen produced by 10 L. clivorum flowers was almost twice higher than that in L. przewalskii. Pollen production per unit area for these taxa was 6.92 g·m⁻² and 1.53 g·m⁻², respectively.
Rodzaj Ligularia skupia gatunki uprawiane w ogrodach przydomowych i na rabatach jako atrakcyjne rośliny ozdobne. W okresie kwitnienia ich koszyczki kwiatowe mogą dostarczać pokarmu pyłkowego dla zapylaczy. W latach 2004–2008 badano intensywność kwitnienia oraz pylenia dwu gatunków Ligularia jako źródeł po żytku pyłkowego dla owadów. W warunkach Lublina początek kwitnienia L. clivorum przypada w drugiej po łowie lipca, L. przewalskii już w ostatnim tygodniu czerwca. W zależności od gatunku i czynników pogody, okres kwitnienia L. clivorum trwał 48–67 dni, L. przewalskii od 29 do 38 dni. W kwiatostanach typu koszyczka znajdują się u obu taksonów kwiaty języczkowate żeńskie i rurkowate obupłciowe. Masa pyłku wytworzona przez 10 kwiatów L. clivorum była prawie dwukrotnie wyższa niż u L. przewalskii. Wydajność pyłkowa z jednostki powierzchni osiągnęła dla tych taksonów odpowiednio 6,92 g·m⁻² i 1,53 g·m⁻².
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2012, 11, 3; 57-67
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oligomerization of hexafluoropropylene oxide in the presence of alkali metal halides
Autorzy:
Meissner, E.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/777879.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tlenek heksafluoropropylenu
oligomeryzacja
oligomery tlenku heksafluoropropylenu
heksafluoropropylene oxide
oligomers of hexafluoropropylene oxide
Opis:
Oligomers of hexafluoropropylene oxide are raw materials for the synthesis of compounds having unique properties such as high chemical and thermal resistance. Two basic parameters have influence on the process of hexafluoropropylene oxide oligomerization: the kind of the catalyst and the solvent. The temperature and pressure influence this process to a lesser extent. The influence of halide ions, the solvent and the temperature on the oligomerization of hexafluoropropylene oxide has been studied.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 3; 95-97
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the influence of parameters on hexafluoropropylene oxide oligomerization in the presence of complex amines
Autorzy:
Meissner, E.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/777883.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tlenek heksafluoropropylenu
oligomery tlenku heksafluoropropylenu
hexafluoropropylene oxide
oligomers of hexafluoropropylene oxide
Opis:
Oligomers of hexafluoropropylene oxide were tested as potential materials for obtaining various compounds with unique properties, of which most important are chemical and thermal resistance. Two basic parameters influence the oligomerization process of hexafluoropropylene oxide: the type of the catalyst and the type of the solvent. Other parameters such as temperature and pressure have significantly less influence. The influence of tertiary amines as catalyst, the type of the solvent, temperature, pressure and catalyst concentration were tested in the process of hexafluoropropylene oxide oligomerization.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 3; 98-100
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epoxidation of allyl-glycidyl ether with hydrogen peroxide over Ti-SBA-15 catalyst and in methanol medium
Autorzy:
Walasek, M.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/778347.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
diglycidyl ether
allyl-glycidyl ether
Ti-SBA-15
epoxidation
Opis:
This work presents the studies on the epoxidation of allyl-glycidyl ether (AGE) over the Ti-SBA-15 catalyst. In these studies an aqueous hydrogen peroxide was used as an oxidizing agent and as a solvent methanol was applied. The studies on the influence the following parameters: temperature (20–80°C), molar ratio of AGE/H2O2  (1:1.5–5:1), methanol concentration (10–90 wt%), catalyst content (1–9 wt%) and reaction time (15–240 min.) were carried out and the most favourable values of these parameters were chosen (temperature 80°C, molar ratio of AGE/H2O2 = 5:1, methanol concentration 30 wt%, catalyst content 3 wt% and the reaction time 240 min.). At these conditions the functions describing the process reached the following values: the selectivity of diglycidyl ether (DGE) 9.2 mol%, the conversion of AGE 13.9 mol% and the efficiency of H2O2  conversion 89.9 mol%.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 4; 9-14
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidation of hexafluoropropylene with molecular oxygen
Autorzy:
Meissner, E.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/778427.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heksafluoropropylen
tlenek heksafluoropropylenu
epoksydacja
oligomeryzacja
Opis:
The results of the oxidation of hexafluoropropylene (HFP) to hexafluoropropylene oxide (HFPO) have been presented. The oxidation was carried out in an autoclave within the range of temperatures of 120 - 170°C and in the presence of an organic solvent (carbon tetrachloride). Molecular oxygen was used here as an oxidizing agent. The influence of: the molar ratio of HFP/O from 13.4 to 4.09:1, the process temperature, the addition of inert gas (nitrogen) from 4 to 18 atm and the periodical dosing of oxygen were investigated. The functions describing the process were: the conversion of HFP and the yield of HFPO in relation to HFP consumed. The presented process is very interesting owing to a wide application of HFPO.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 1; 20-22
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new method of 1,2-epoxy-3-butanol production over titanium silicalite catalysts
Autorzy:
Wajzberg, J.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/779811.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
1,2-epoksy-3-butanol
epoksydacja w fazie ciekłej
TS-1
Ti-Beta
Ti-MCM-41
1,2-epoxy-3-butanol
liquid phase epoxidation
Opis:
The results of 1-butene-3-ol (1B3O) epoxidation over the titanium silicalite catalysts: TS-1, Ti-Beta, Ti-MCM-41 has been presented. The optimal parameters obtained for the individual catalyst were compared. The main functions describing the process were: the selectivity of transformation to 1,2-epoxy-3-butanol (1,2E3B) in relation to 1B3O consumed, the conversions of 1B3O and hydrogen peroxide and the selectivity of the transformation to organic compounds in relation to the H2O2 consumed. The main product of the epoxidation process was 1,2-epoksy-3-butanol, the chemical compounds having a lot of applications.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 2; 49-52
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on the deactivation of Ti-MCM-41 catalyst in the process of allyl alcohol epoxidation
Autorzy:
Wróblewska, A.
Makuch, E.
Powiązania:
https://bibliotekanauki.pl/articles/778158.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
titanium silicate Ti-MCM-41 catalyst
deactivation of Ti-MCM-41catalyst
regeneration of Ti-MCM-41catalyst
Opis:
The synthesis of Ti-MCM-41 catalyst was performed. The obtained catalyst was characterized by the following instrumental methods: UV-vis, IR spectroscopy, XRD, and X-ray microanalysis. The activity of the obtained catalyst was tested in the process of allyl alcohol epoxidation with 30 wt.% hydrogen peroxide in methanol as a solvent and under atmospheric pressure. In the next stage, recovery of Ti-MCM-41 catalyst from the post-reaction mixture and its regeneration by washing with appropriate solvents and drying were conducted. In the case of total loss of the activity of the catalyst, calcination of the catalyst was also carried out. The loss of titanium from the structure of Ti-MCM-41 catalyst and a partial collapsing of the structure of this catalyst can be the main reason of the decrease the activity of the catalyst what was manly visible in the decrease of the values of two functions of this process: the allyl alcohol conversion and conversion of hydrogen peroxide to organic compounds.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 4; 111-115
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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