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Tytuł:
Grain-size and microstructure of the loess from closed depressions in the Naleczow Plateau (East Poland)
Autorzy:
Kolodynska-Gawrysiak, R.
Trzcinski, J.
Zaremba, M.
Mroczek, P.
Powiązania:
https://bibliotekanauki.pl/articles/971455.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
The investigation was conducted in the eastern part of the Nałęczów Plateau, a region of the Lublin Upland, in eastern Poland. The loess cover of this region was formed mainly during the last glaciation, and loess accumulation lasted until 15,000–12,000 BP. The undulating loess plateau with numerous oval-shaped closed depressions (CDs) is the main landform in the study area. Particle size distribution and SEM analyses were conducted for loess profiles under the bottoms and on the slopes of 4 CDs. Grain-size distribution characteristics as well as qualitative and quantitative micromorphological characteristics of the the loess forming the bottoms and slopes of the depressions were compared and discussed. It was documented that the differences between the loess forming the bottoms and slopes of the depressions are insignificant in the case of clay fraction content, but are considerable in the case of microstructure characteristics. The differences documented result from the impact of syn- and post-depositional diagenetic processes related mainly to suffosion and hydroconsolidation occurring under the influence of water. A quantitative assessment of the morphological effects of these processes was carried out in the context of the origin of closed depressions. The morphological effect of Holocene diagenetic processes was manifested in the deepening of the initial closed depressions formed previously under the influence of primary morphogenetic processes.
Źródło:
Polish Journal of Soil Science; 2019, 52, 2; 295-305
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie elementów leśnych dróg wywozowych według opinii kierowców i zarządców dróg
Significance of the elements of forest transport roads in the opinion of the drivers and road managers
Autorzy:
Kikulski, J.
Trzciński, G.
Powiązania:
https://bibliotekanauki.pl/articles/985848.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drogi lesne
drogi wywozowe
parametry drog
opinia uzytkownikow
kierowcy
zarzadcy drog
badania ankietowe
high haulage vehicles
roads parameters
roads users
questionnaire survey
Opis:
The purpose of the study was to determine the importance of various parameters of forest roads used by heavy goods vehicles for transporting timber based on the research conducted among drivers and employees working on the road infrastructure of a forest district (road managers). The study analyzed the road parameters presented in the site plan, its vertical structure and type of surface (material). A questionnaire was sent by post to all (430) forest districts in Poland, which resulted in the receipt of 296 correctly completed surveys. Additionally, individual questionnaire interviews (82) were conducted with drivers of heavy goods vehicles (trucks with dolly or semi− −trailer, and trucks with trailer). The questionnaire used an analogue scale, where respondents marked a point corresponding to the intensity of their assessment. Non−parametric tests were used (Friedman ANOVA and Kendall compatibility factor, U Mann−Whitney) in the statistical analyses. According to drivers, the most important road parameters in the site plan are the width of intersections (widened sections in the form of arcs that facilitate turning onto a perpendicular road), the proper location of log−yards, widened curves and the roadway width. Forest district employees pointed the width of intersections and the roadway as the most important. The road elements in the situational plan are regarded as more important by drivers of vehicles with dolly or semi−trailer compared to the drivers of vehicles with a trailer, which is caused by the differences in the parameters of these vehicles (turning radius). The most important road parameter in terms of the vertical structure is its gradual course (no steep ascents and descents). The respondents attach great importance to the significance of the type of road surface used, and indicated bituminous and crushed stone pavements as the most useful on transport routes in the forest. The importance of road parameters was rated significantly higher by drivers of high tonnage vehicles. However, it should be emphasized that despite the differences found, the answers of forest district road managers also indicate that they attach great importance to having the transport roads in the forest meet specific design requirements. In general the respondents considered the parameters of all analyzed road elements important – the importance of individual parameters was evaluated to from 5 to 6.5 out of 7 pts.
Źródło:
Sylwan; 2018, 162, 12; 1038-1046
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The phenology of occurrence of dominant predatory Syrphidae (Diptera) species in apple orchards and on their edges
Autorzy:
Piekarska-Boniecka, A.
Siatkowski, I.
Zyprych-Walczak, J.
Trzciński, P.
Rzańska-Wieczorek, M.
Powiązania:
https://bibliotekanauki.pl/articles/11855248.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
The blooming wild plants in the vicinity of orchards may attract adult Syrphidae to these cultivations. Hence in 2008–2010 studies were conducted around Czempiń (western Wielkopolska) which covered the occurrence of the imagines of 5 dominant predatory Syrphidae species in apple orchards and on their edges. The phenology of Episyrphus balteatus (De Geer), Eupeodes corollae (F.), Melanostoma mellinum (L.), Sphaerophoria scripta (L.) and Syrphus vitripennis Meigen in apple orchards as well as in the neighbouring shrubberies and on the side of the road overgrown with trees and bushes was analysed. A greater abundance of imagines of the studied species was found on the edges than in the apple orchards. Also a preference for either orchards or their sides was indicated for Syrphidae, as they appeared in these biocenoses earlier or later, but not at the same time. A correlation between a mass catch of Syrphidae in the orchards and their edges was found. It was shown that the blooming plants of orchard edges, such as Tilia cordata, Symphoricarpos albus, Cirsium arvense and Galium aparine, could attract Syrphidae imagines to the orchards.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 1; 23-38
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Melt-Cast Composition Based on NTO and FOX-7
Autorzy:
Belaada, A.
Trzciński, W. A.
Chyłek, Z.
Szala, M.
Paszula, J.
Powiązania:
https://bibliotekanauki.pl/articles/358828.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NTO
FOX-7
low-sensitivity explosives
melt-cast explosives
Opis:
A melt-cast composition containing NTO, FOX-7, TNT, Al and wax was prepared and tested. The viscosity of the melted composition was measured. Its sensitivity to impact, friction, shock wave and jet impact were determined, and its thermal stability and ignition temperature were established. Some detonation properties of the composition were investigated. The heat of detonation was measured using a calorimetric bomb. The detonation pressure and velocity were determined in a plate-dent test. The results of a cylinder test were used for the determination of the Gurney energy, the detonation pressure and energy, and the so-called effective exponent of the expansion isentrope and the JWL equation of state of the detonation products.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 882-902
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explosive Properties of 4,4’,5,5’-Tetranitro-2,2’-bi-1H-imidazole Dihydrate
Autorzy:
Lewczuk, R.
Szala, M.
Rećko, J.
Cudziło, S.
Klapötke, T. M.
Trzciński, W. A.
Szymańczyk, L.
Powiązania:
https://bibliotekanauki.pl/articles/358061.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
TNBI dihydrate
NTO
explosives
detonation properties
thermal analysis
Opis:
This paper reports measured explosive properties of 4,4’,5,5’-tetranitro-2,2’-bi-1H-imidazole dihydrate (TNBI•2H2O). Non-isothermal kinetics analysis, calorimetric measurements, detonability tests, small-scale shock reactivity tests (SSRT), detonation velocity measurements and cylinder tests were performed. The results of the cylinder tests were used to determine the acceleration ability of TNBI•2H2O. Some experiments were conducted also with TNT, NTO, FOX-7 and RDX. Our experimental studies have shown that TNBI•2H2O is a thermodynamically stable compound, surpassing TNT with regard to its energetic and detonation parameters. The results of the SSRT indicate that this material has better performance in small charges than RDX, FOX-7 and NTO.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 3; 612-626
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New records on the distribution of Dermacentor reticulatus ticks (Acari: Ixodidae) in the Olsztyn region (north-eastern Poland)
Autorzy:
Kubiak, K.
Dziekonska-Rynko, J.
Sielawa, H.
Dzika, E.
Trzcinski, D.
Powiązania:
https://bibliotekanauki.pl/articles/5980.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
new record
species distribution
Dermacentor reticulatus
tick
Acari
Ixodidae
Olsztyn region
Polska
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NTO-based Melt-cast Insensitive Compositions
Autorzy:
Trzciński, W. A.
Lasota, J.
Chyłek, Z.
Szala, M.
Paszula, J.
Powiązania:
https://bibliotekanauki.pl/articles/358929.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NTO
insensitive explosives
melt-cast explosives
Opis:
This paper presents research on insensitive melt-cast explosive compositions based on 3-nitro-1,2,4-triazol-5-one (NTO) and containing TNT, wax, Al and RDX. The viscosity of the compositions in the operating temperature range was measured. Thermal analysis was performed as well as thermal stability and sensitivity to mechanical and thermal stimuli were tested. The detonation parameters were also determined. Finally, the acceleration ability (Gurney energy) and the JWL coefficients for the detonation products were established.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 3; 592-611
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-strain behaviour analysis of Middle Polish glacial tills from Warsaw (Poland) based on the interpretation of advanced field and laboratory tests
Autorzy:
Bąkowska, A.
Dobak, P.
Gawriuczenkow, I.
Kiełbasiński, K.
Szczepański, T.
Trzciński, J.
Wójcik, E.
Zawrzykraj, P.
Powiązania:
https://bibliotekanauki.pl/articles/139030.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
glacial tills
Warsaw
compressibility
strength
advanced tests
glina lodowcowa
Warszawa
ściśliwość
wytrzymałość
testy
Opis:
The selected parameters of the Wartanian and Odranian tills, with relation to their spatial occurrence, grain size distribution, mineralogical composition, matric suction and other physical characteristics, are presented. The assessment of the lithogenesis and stress history on the microstructure is attempted. The comparison of the compression and permeability characteristics from field and laboratory tests has been performed. Laboratory consolidation tests carried out with up to 20MPa vertical stress, revealed two yield stress values, one in the range of a couple hundreds kPa, the other in the range of a couple thousands kPa. Based on those results, the reliability of the soil preconsolidation assessment, with the use of the two different methods is discussed. The aspect of the triaxial strength reduction under the dynamic loading of diverse frequency and amplitude is raised. The research results depict a variety of possible geological-engineering characteristics, under the divergent constraints scenarios, of compression or strength weakening origin. The effects of the specialized research program will widen the possibilities of physio-mechanical and structural characterization of soils for geological-engineering purposes.
Źródło:
Acta Geologica Polonica; 2016, 66, 3; 561-585
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Confined Explosions of Composite Explosives and Layered Charges
Autorzy:
Maiz, L.
Trzciński, W. A.
Szala, M.
Paszula, J.
Karczewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/358488.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
thermobaric
composite explosives
layered charges
confined explosion
QSP
Opis:
In the present work, the confined explosions of cylindrical homogeneous and layered charges composed of two different types of macroscopic granular multi-component RDX-based composites were investigated. These composites were obtained by the so-called “wet slurry method”. For comparison, charges consisting of simple mixtures instead of the composites, TNT and phlegmatized RDX (RDXph) were also studied. The effect of the following parameters: the structure of the macroscopic granular composite, the type of charge (cylindrical pressed material or layered with an RDXph core), oxygen availability (air or argon atmosphere) and the aluminium particle size, on the quasi-static pressure (QSP) measured inside a 150 dm3 explosion chamber was determined. Solid post-detonation residues from inside the explosion chamber were also collected and analyzed. A combination of all of these results enabled very important conclusions about aluminium combustion and behaviour during the explosion of composite and layered charges, to be drawn.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 957-977
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for Preparing Spheroidal Particles of 3-Nitro- 1,2,4-triazol-5-one (NTO)
Autorzy:
Lasota, J.
Chyłek, Z.
Trzciński, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/358248.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NTO
recrystallization
properties
Opis:
This paper presents an overview of methods for recrystallizing 3-nitro- 1,2,4-triazol-5-one (NTO), with particular emphasis on methods for obtaining spheroidal particles with low porosity. The effects of selected solvents and surfactants on the recrystallization results was checked. Products in the form of spheroidal particles were obtained for some selected solvent-surfactant systems. The bulk density, surface area, size distribution, and sensitivity to friction and impact were tested for the spherical NTO samples and thermal analysis was also performed.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 4; 769-783
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie stref zagrożenia odłamkami
Determination of hazard areas for metal fragments
Autorzy:
Trzciński, W. A.
Hańderek, J.
Powiązania:
https://bibliotekanauki.pl/articles/92650.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
amunicja
zagrożenia odłamkami
strefy bezpieczne dla odłamków
ammunition
fragment hazard
safety distances for metal fragment
Opis:
W pracy dokonano przeglądu metod stosowanych w Polsce i w krajach NATO do wyznaczania stref zagrożenia odłamkami. Szczegółowo omówiono procedurę obliczania stref zagrożenia przedstawioną w normie STANAG 4440. Zaproponowano własną metodę określania maksymalnego zasięgu dla odłamków niebezpiecznych dla ludzi. Dla modelowego pocisku obliczono prędkość początkową i rozkład masowy odłamków oraz wyznaczono strefy zagrożenia dla ludzi oraz maksymalny zasięg odłamków dla różnych poziomów bezpieczeństwa. Podobne obliczenia wykonano dla modelowego stosu amunicji. Porównano uzyskane rezultaty z wielkościami stref określonych w przepisach obowiązujących w Polsce.
The paper presents an overview of methods used in Poland and NATO countries for determining hazard zones for fragments. The procedure for calculating the hazard zones presented in the STANAG 4440 is discussed in detail. The method was proposed to estimate the maximum distance for debris dangerous to humans. For a model projectile the initial velocity and mass distribution of fragments were calculated and the zone of hazard to humans and maximum distance for fragments for different security levels were determined. Similar calculations were performed for a model stack of ammunition. The results obtained were compared with the zones specified in the Polish regulations.
Źródło:
Materiały Wysokoenergetyczne; 2015, T. 7; 14-30
2083-0165
Pojawia się w:
Materiały Wysokoenergetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation and Decomposition Characteristics of Dichlorate(VII) μ-Tris(4-amino-1,2,4-triazole)copper(II)
Autorzy:
Cudziło, S.
Trzciński, W. A.
Paszula, J.
Nita, M.
Powiązania:
https://bibliotekanauki.pl/articles/358059.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
4-amino-1,2,4-triazole
complex copper compound
primary explosive
detonation parameters
Opis:
Dichlorate(VII) μ-tris(4-amino-1,2,4-triazole)copper(II) is an explosive with a performance close to that of lead azide. However, it is quite stable and has moderate sensitivity to thermal and mechanical stimuli. In order to fully characterize it as a primary explosive, its thermal decomposition kinetics were studied and some important detonation and explosion parameters (detonation heat and velocity, acceleration ability, water shock wave overpressure, and energy) were measured and/or calculated.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 539-552
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie reakcji materiałów wysokoenergetycznych na uderzenie strumienia kumulacyjnego
Investigation of the reaction of energetic materials on jet impact
Autorzy:
Trzciński, W. A.
Piergies, J.
Steckiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/211240.pdf
Data publikacji:
2013
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
materiały wysokoenergetyczne
strumień kumulacyjny
improwizowane urządzenia wybuchowe
energetic materials
cumulative jet
improvised explosive devices
Opis:
W pracy zbadano reakcję materiałów wysokoenergetycznych zamkniętych w ciężkich otoczkach na uderzenie strumienia kumulacyjnego. Do badań wytypowano nieidealne materiały wybuchowe, trotyl oraz środki bojowe zabezpieczone przez policję. Scharakteryzowano strumień generowany przez zastosowane ładunki kumulacyjne. Materiały wybuchowe zamykano w rurach stalowych i ich reakcję oceniano na podstawie ilości i wielkości odłamków. Próby przeprowadzono na specjalnie przygotowanym stanowisku umożliwiającym odzyskanie odłamków. Środki bojowe testowano w warunkach poligonowych.
In the paper, the reaction of energetic materials closed in heavy enclosures on jet impact was tested. Non-ideal explosives, TNT and munitions secured by the police were chosen for investigations. A cumulative jet generated by the applied shaped charges was characterized. Explosives were confined in steel tubes and their response was assessed by taking into account the number and size of fragments. Tests were carried out on a special set-up that allows for recovery of debris. Warfare agents were tested on the training range.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 1; 287-305
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geophysical survey (GPR) in West Saqqara (Egypt): preliminary remarks
Autorzy:
Welc, F.
Trzciński, J.
Kowalczyk, S.
Mieszkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2027033.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ar chae o log i cal mis sion
ground-pen e trat ing ra dar
Dry Moat
Saqqara
Egypt
Opis:
Geo phys i cal in ves ti ga tions in West Saqqara area were part of the ar chae o log i cal field work of the Pol ish-Egyp tian archae o log i cal mis sion dur ing the cam paign in 2012. The main pur pose of geo phys i cal prospection us ing the groundpene trat ing ra dar (GPR) was to de ter mine the lo ca tion of po ten tial un der ground se pul chral struc tures. Dur ing the GPR sur vey, op ti mal depth pen e tra tion was achieved due to dry rocks and mono lithic struc ture of the lime stone pla teau on which the an cient cem e tery was lo cated. Us ing an tenna of 100 MHz, the depth of pen e tra tion was up to 45 m and with an tenna of 250 MHz, up to 15 meters. Three main groups of archaeological structures were identified: sarcophagi and mum mies, burial shafts; mo bile ob jects (solid rock blocks as frag ments of tombs). One of the main goal of the GPR sur - vey was to track the route of the west ern part of the Dry Moat, ex pressed by a wide and shal low de pres sion spread ing to - wards north-south. The re sults of geo phys i cal in ves ti ga tions sug gest that Saqqara pla teau is an ideal site for us ing GPR survey ing technology.
Źródło:
Studia Quaternaria; 2013, 30; 99-108
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany mikrostrukturalne past gruntowych pod wpływem ciśnienia ssania
Microstructural changes in remoulded specimens due to suction pressure
Autorzy:
Wójcik, E.
Trzciński, J.
Łądkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/2075002.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
microstructure
pore space
Neogene clay
suction pressure
mikrostruktura
przestrzeń porowa
iły neogeńskie
ciśnienie ssania
Opis:
This paper presents an issue of microstructural changes in clay soils during the water loss due to increase of suction pressure. The change of microstructure affects the geological engineering properties of soils causes problems with the foundation of buildings. The volumetric changes of cohesive soils, containing significant amounts of clay minerals from the smectite group, are caused by a variable water content in soil. The phenomenon of the moisture change significantly alters the geological engineering properties of these soils as a result of shrinking and swelling. This paper aims at presenting the microstructural changes in remoulded specimens of Neogene clays caused by loss of moisture due to suction pressure. The scientific examination involved quantitative analyses of the microstructure using scanning electron microscopy (SEM) to study pore space details of remoulded specimens. Tested samples from selected levels of the Neogene clays (Poznan Series) were collected from the Warsaw-Stegny area. Samples were taken from a research polygon for these clay soils. The basic geological engineering properties of clay soils and remoulded specimens have been examined after being prepared according to strictly defined procedures. Through successive stages of the suction pressure (from 50 to 1600 kPa), the samples underwent the process of loss of moisture. Application of a novel method of sample preparation procedure for remoulded specimens allowed examining structurally homogeneous soils and obtaining results without an effect of material anisotropy. The qualitative and quantitative analysis of soil microstructures were performed using SEM and STIMAN software for quantitative images processing. The analysis allowed determination of the number of geometric and morphometric parameters of the microstructure with high accuracy. Based on this study, significant qualitative and quantitative changes in loss of moisture due to suction pressure in the process of remoulded specimens were noted along with changes in the microstructure and pore space of clay soils. The obtained results showed the effect of successive stages of "closing" of the structure of cohesive soils. Microstructural changes have a significant influence on the values of clay soil properties during the shrinkage and swelling process, which are caused by changes in the water content.
Źródło:
Przegląd Geologiczny; 2013, 61, 1; 74--82
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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