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Wyświetlanie 1-15 z 101
Tytuł:
Wyznaczanie parametrów odporności na pękanie materiałów quasi-kruchych na próbkach cylindrycznych z karbami
Determination of the fracture toughness parameters of the quasi-brittle material using cylindrical specimens
Autorzy:
Kazberuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/387134.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
odporność na kruche pękanie
pękanie
fracture toughness
fracture
Opis:
Zaproponowano metodę wyznaczania krytycznego współczynnika intensywności naprężeń materiału na ściskanych próbkach o przekroju kołowym z centralnie umieszczonym otworem w postaci rombu. Proces zniszczenia próbki postępuje od wierzchołku karbu typu V. Znając wartość obciążenia niszczącego oraz standardowe stałe materiałowe oblicza się krytyczny współczynnik intensywności naprężeń wykorzystując odkształceniowe kryterium pękania oparte na modelu Dugdale’a. Zagadnienie koncentracji naprężeń w otoczeniu wierzchołków otworu rozwiązano metodą osobliwych równań całkowych.
The method of determination of critical SIF of brittle and quasi-brittle material is presented. For the splitting cylindrical specimen with central diamond-shaped hole the stress intensity factors were calculated for arbitral vertex angle. The values of critical SIF was obtained considering the deformation fracture criterion based on Dugdale model of failure with assumption that fracture process zone starts from notch tip.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 3; 28-31
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature and hydrogen concentration influence on Zi -2.5Nb alloy mechanical and fracture toughness characteristics
Autorzy:
Daunys, M.
Dundulis, R.
Krasauskas, P.
Powiązania:
https://bibliotekanauki.pl/articles/386588.pdf
Data publikacji:
2007
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fracture
temperature
hydrogen
Opis:
This paper deals with an investigation of temperature and hydrogen concentration influence on Ignalina NPP RBMK-1500 unit 2 reactor fuel channel tube material - Zr-2.5Nb zirconium alloy (TMT-2) mechanical and fracture toughness characteristics. Two types of specimens were used in this study - tensile and compact semi-natural specimens. Testing temperatures were selected from 20 to 300°C that correspond various operating regimes of the reactor. Made-up hydrogen saturated specimens were tested at hydrogen concentration levels from 52 up to 140 ppm m order to examine hydrogen influence on mechanical and fracture toughness characteristics of the alloy. Dependence of fracture toughness to various mechanical characteristics of the alloy was analysed. Investigation has shown correlation of stress intensity factor Kc to modified plasticity criterion of the alloy.
Źródło:
Acta Mechanica et Automatica; 2007, 1, 1; 19-22
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epidemiological assessment of maxillofacial fractures in inhabitants of Lower Silesia, Poland, in 2002-2006 - Treatment of maxillofacial fracture
Autorzy:
Parulska, O.
Dobrzynski, M.
Bazan, J.
Calkosinski, I.
Powiązania:
https://bibliotekanauki.pl/articles/3318.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Tematy:
epidemiology
maxillofacial fracture
treatment
fracture
inhabitant
Lover Silesia
Polska
2002-2006 period
Opis:
Introduction and objective. Epidemiological assessment of maxillofacial fractures carried out by a given specialized centre may constitute valuable material for comparison with other regions of Poland and the European Union. This material could help standardize the present methods of treating craniofacial skeleton dislocations, and plan appropriate financial resources both for specialized treatment of such fractures and fractures that require multidisciplinary care. Moreover, the frequency of complicated maxillofacial fractures leading to residual disability and circumstances in which fracture occurred may be useful for the Social Security authorities. Materials and methods. This study is a continuation of research on maxillofacial traumatology carried by the Maxillofacial Department of the Medical University in Wrocław, Lower Silesia. Since 1956, a statistical review of maxillofacial fractures has been kept in 5 or 10-year periods. Statistical analysis of this kind is useful in indentifying the frequency of the phenomenon, taking suitable treatment precautions, verifying treatment methods, and analyzing costs and losses incurred as a result of absence at work. Sociological aspect of such studies includes indicating sources of socially adverse phenomena, i.e. violence or alcohol abuse. The studies were based on clinical documentation of 937 patients, where dependencies between chosen parameters were identified. As a basic statistical analysis of variable interdependence the χ2 test of independence was applied. Conclusions. Lately, there have been more maxillofacial fractures resulting from civilization changes. Simultaneously, there are new treatment methods and significant progress has been made regarding materials that are used in these treatments.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2015, 09, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
With-Fracture Gurney Model to Estimate both Fragment and Blast Impulses
Autorzy:
Hutchinson, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/358683.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
Gurney
Taylor
casing
fracture
explosive
Opis:
Work to extend Gurney’s model for fragment velocity to predict blast impulse is ongoing by means of analytical calculations, based on gas and casing dynamics, with comparisons to available experimental data. The issue of early case fracture, with release of explosive gases thus retaining a greater degree of momentum, is also addressed. The method is based on that of G.I. Taylor and can include both case material compressive fow stress and explosive properties such as Chapman-Jouguet pressure. Comparisons between this new Taylor-based theory and blast data from studies of cased charges are shown. The potential effects on blast output of casing dynamic material properties appear considerable. Dynamic testing of case metals is needed to confrm the yield stresses implied by the blast data. It is expected that this method will be useful to the researcher in a number of roles.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 2; 175-186
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of modification for structure and impact resistance of silumin AlSi11
Autorzy:
Romankiewicz, R.
Romankiewicz, F.
Powiązania:
https://bibliotekanauki.pl/articles/111700.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
silumin
modification
fracture
modyfikacja
pęknięcie
Opis:
In this paper the results of the modification process of alloy AlSi11 as well as the influence of modification for structure and impact resistance have been presented. The investigation revealed that the modification of the AlSi11 silumin with the addition 0,05 - 0,4% AlSr10 and 0,1 - 0,2% AlB4 simultaneously provided the advantageous refinement of the α-phase as well as the change of the morphology of the eutectic silicon from the lamellar into the fibrous one. The change resulted in a relevant increase in the impact resistance of the alloy and the widening of the plastic area of the fracture of the silumin samples.
Źródło:
Production Engineering Archives; 2014, 3, 2; 6-9
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Internal Scrap on Mechanical Properties of Selected Cobalt Alloys
Autorzy:
Dęsoł, B.
Zapała, R.
Pałka, P.
Powiązania:
https://bibliotekanauki.pl/articles/106965.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
cobalt alloy
mechanical properties
fracture
scrap
Opis:
This paper presents the results of mechanical tests carried out on two different commercially available cobalt alloys applied in dental prosthetics for the production of frame dentures. The test samples were obtained by the method of investment casting using as a charge pure primary materials and pure primary materials mixed with various additions of process scrap (25, 50, and 75%). The tests showed that the alloys could not reach the mechanical properties reported by the manufacturer in either case. In the case of the alloy without the addition of tantalum, the general conclusion was that both the plastic and strength properties decreased with increasing amounts of the introduced process scrap. The mechanical properties (mainly elongation) of the alloy containing Ta reached the highest values in the samples containing 75% of the process scrap. Examinations of fractures carried out by SEM have revealed their varied character – ductile or transcrystalline. All of the samples tested showed the presence of dendrites and solidification areas, with shrinkage porosity occurring in the internal sample zones.
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 3; 59-63
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal implants in ostheosynthesis - construction solutions, materials and applications
Autorzy:
Hutnik, A.
Świeczko-Żurek, B.
Szumlański, A.
Serbiński, W.
Powiązania:
https://bibliotekanauki.pl/articles/285836.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
metal implants
intramedullary nail
fracture
ostheosynthesis
Opis:
Every day human bones undergo different injuries resulting from public transport accidents, diseases or trauma. Consequently, they cause temporary or constant patients disability or even death. Fractures happen not only to elderly people suffering from osteoporosis, but also more and more frequently to young people, who got some injuries as a result of life style, e.g. doing sports. The desire to enhance the physical well being and quality of patients' life, who got some injury causes constant development of medical devices for osteosynthesis. In the case of complicated fractures, in which plaster treatment is not sufficient, surgical treatment and applying implant are indispensable. The aim of the article is to present two case studies on intramedullary nails. The first one concerns a method of osteosynthesis for a patient, who was injured in an accident. The second one presents the failure of the implanted intramedullary nail. The research included evaluation of the type of fracture and the analysis of microstructure, chemical composition and hardness of the implant materials.
Źródło:
Engineering of Biomaterials; 2012, 15, 115; 7-11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of static crack propagation in adhesive joints
Autorzy:
Hedayati, R
Jahanbakhshi, M
Ghorbani Khouzani, S
Powiązania:
https://bibliotekanauki.pl/articles/280484.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fracture
adhesive joint
debonding
APDL
LEFM
Opis:
In this work, fracture mechanics methodology is used to predict crack propagation in the adhesive joining of aluminum and composite plates. Three types of loadings and two types of glass-epoxy composite sequences: [0/90]2s and [0/45/-45/90]s are considered for the composite plate. Therefore 2 × 3 = 6 cases are considered and their results are compared. The debonding initiation load, complete debonding load, crack face profile and load-displacement diagram have been compared for the six cases.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 937-946
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the design of experiments and statistical hypothesis to reduce defects in the flange of the steel plate process
Autorzy:
Sadłowska, Hanna
Wójcik, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/29520066.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
laser cutting
flanging
fracture
statistical hypotheses
Opis:
The paper presents a discussion on the occurrence of defects in the circumferential flange of steel plate. The numerous flange face defects have been analysed. The types of defects have been selected and categorized using an experimental planning procedure involving 600 samples for 24 different process variants, considering variables such as material, hole diameter, tool size and tool position. The analysis of experimental results enabled to determine of the optimal values of process parameters to minimize the occurrence of defects. Furthermore, the influence of individual parameters on the quality of the flange surface has been carried out to obtain the process parameters’ impact using statistical hypotheses. As a result, it was possible to develop rules which will be helpful in the design process, especially important when changing the material to be processed.
Źródło:
Computer Methods in Materials Science; 2022, 22, 3; 149-156
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supracondylar humerus fractures in children – a retrospective study
Złamania nadkłykciowe kości ramiennej u dzieci – badanie retrospektywne
Autorzy:
Napora, Justyna
Mazur, Natalia
Trzciński, Rafał
Sobocki, Bartosz Kamil
Szczutkowski, Karol
Krakowiak, Artur
Dąbrowski, Filip
Mazurek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2191550.pdf
Data publikacji:
2022-06-30
Wydawca:
Wydawnictwo Exemplum
Tematy:
supracondylar fracture
paediatric orthopaedics
humerus
fracture
children
elbow
złamanie nadkłykciowe
ortopedia dziecięca
kość ramienna
złamanie
dzieci
łokieć
Opis:
Introduction. Supracondylar fracture of the humerus is the most common type of distal humeral fracture in children. Either operative or non-operative treatment depends on Gartland’s classification and neurovascular damage. There is still room for discussion on which Kirschner pin’s configuration should be chosen – crossed pinning or lateral pinning. Aim. Our study aimed to compare clinical results of treating supracondylar humeral fractures in children with cross and lateral pinning. We also aimed to assess the correlation between sociodemographic data and clinical results. Materials and methods. 75 patients aged less than 18 years, operated for supracondylar humeral fracture between September 2010 and June 2021 were retrospectively analysed. Two treatment modalities were studied for comparison – crossed pinning and lateral pinning. Results. Crossed pinning was performed in 62 patients (82.7%) and lateral pinning in 13 patients (17.3%). The mean age during trauma was 6.83 years (2-14). There was a significantly higher incidence (p = 0.03) of current complaints in the group treated from the side compared to the group treated crosswise (54% vs 32% of patients reported current complaints, respectively). There were no relevant differences observed between the type of fixation and the following studied parameters: current VAS (Visual Analogue Scale) pain score, Baumann angle of the operated limb, flexion deficit in the elbow joint of the operated limb, presence of current neurological complications, satisfaction with the current function of the limb, Flynn criteria, and Mayo Elbow Score. Conclusions. The discussion in the literature addressing the superiority of lateral or crossed pinning of supracondylar humeral fractures in children still exists. Both methods provide excellent clinical and functional results.
Wstęp. Złamanie nadkłykciowe jest najczęstszym rodzajem złamania końca dalszego kości ramiennej u dzieci. W zależności od klasyfikacji Gartlanda i obecności uszkodzeń nerwowo-naczyniowych stosuje się leczenie operacyjne lub nieoperacyjne. Tematem do dyskusji pozostaje to która metoda stabilizacji daje lepsze wyniki – wprowadzanie drutów Kirschnera od boku czy na krzyż. Cel. Celem naszej pracy było przedstawienie i porównanie wyników leczenia złamań nadkłykciowych z podziałem na powyższe metody oraz ocena korelacji między danymi socjo-demograficznymi, a wynikiem leczenia. Materiał i metody. Analizie retrospektywnej poddano 75. chorych w wieku poniżej 18 lat, operowanych z powodu złamania nadkłykciowego kości ramiennej w okresie od września 2010 do czerwca 2021. W celu porównania zbadano dwie metody leczenia – stabilizację metodą od boku oraz na krzyż. Wyniki. Stabilizację metodą na krzyż wykonano u 62 chorych (82,7%), od boku u 13 (17,3%). Średni wiek w czasie urazu wynosił 6,83 lat (2-14). Wystąpiła istotnie większa częstość (p = 0,03) aktualnych dolegliwości w grupie leczonej metodą od boku w porównaniu z grupą leczoną metodą krzyżową (odpowiednio 54% vs. 32% chorych). Nie zaobserwowano istotnych różnic pomiędzy rodzajem stabilizacji, a następującymi badanymi parametrami: aktualna ocena bólu w skali VAS (Visual Analogue Scale), kąt Baumanna, deficyt zgięcia w stawie łokciowym operowanej kończyny, obecność aktualnych powikłań neurologicznych, zadowolenie z aktualnej funkcji kończyny, kryteria Flynna i Mayo Elbow Score. Wnioski. W piśmiennictwie nadal trwa dyskusja na temat wyższości bocznego lub krzyżowego stabilizowania złamań nadkłykciowych kości ramiennej u dzieci. Obie metody zespalania dają dobre wyniki kliniczne i funkcjonalne.
Źródło:
Chirurgia Narządów Ruchu i Ortopedia Polska; 2022, 87, 2; 57-62
0009-479X
2956-4719
Pojawia się w:
Chirurgia Narządów Ruchu i Ortopedia Polska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does water lubrication affect friction differently for rocks and soils? Evidence and open questions
Autorzy:
Cafaro, F.
Hamad, A.
Monterisi, L.
Powiązania:
https://bibliotekanauki.pl/articles/2172879.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water lubrication
friction scale
fracture
sliding
roughness
Opis:
The present paper focuses on the shear strength exhibited by rocks and soils when sliding along dry and wet surfaces, with this mechanism of failure being strongly related to the water lubrication phenomenon. It is well known that the frictional behaviour of geomaterials requires multiscale investigation. Under this perspective, experimental evidence of both friction at the grain scale (i.e. interparticle friction) and friction along sliding surfaces of rock and granular soil samples (i.e. surface friction) are analysed by using data from the literature. The review is addressed at linking different scales, stating the differences between rocks and soils in terms of frictional response to sliding and trying to point out still open problems for the research.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 3; 211--223
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rib kinematics analysis in oblique and lateral impact tests
Autorzy:
Jastrzębski, Dominik
Perz, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/306287.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pęknięcie
tułów
żebro
THUMS
fracture
thorax
rib
Opis:
Understanding thorax kinematics and rib breaking mechanisms in conditions of oblique and lateral impact is crucial in safety systems development. To increase knowledge level on this subject, simulation and experimental tests are necessary. The purpose of this study was to obtain single rib kinematics in the case of oblique and lateral impact conditions using numerical simulation approach. Methods: Two impact tests using human body model of a 50th percentile man (THUMS v4.0.1 AM50) were performed in LS-Dyna R7.1.1. Impactor was a rigid cylinder with a diameter of 152 mm, and velocity equal to 6.7 m/s. Impact angle measured to sagittal plane was 30 and 90°, respectively in oblique and lateral impact case. Results: Kinematics of ribs from 3rd to 6th were analyzed. Results shown significant similarities between oblique impact and kinematics of ribs tested in frontal impact conditions in the literature, with maximal costochondral joint displacement relatively to costovertebral joint varying from 65.4 mm (3rd rib) to 82.0 mm (5th rib). Deformation of rib in lateral impact conditions was different than during oblique impact test, with distinctive “flattening” approximately in the middle of the rib. Maximal relative displacement varies from 16.4 mm (6th rib) to 26.6 mm (5th rib) and its location depends on the analyzed rib. Conclusions: Oblique impact scenario may be simulated for the single rib on an experimental way using set-up of the frontal impact. Experimental simulation of the lateral impact for the single rib should not use the same set-up, as the kinematics analysis showed significant differences between simulated cases.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 1; 135-141
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fracture toughness of 19Mn5 steel pipe welded joints materials
Autorzy:
Daunys, M.
Krasauskas, P.
Dundulis, R.
Powiązania:
https://bibliotekanauki.pl/articles/387258.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pękanie
wytrzymałość
stal
fracture
strength
steel pipes
Opis:
This paper presents an investigation of Ignalina NPP reactor’s main circulated circuit (MCC) pipeline welded joints materials fracture toughness properties. Standard compact C(T)-1T specimens containing “V” and “K” – type welds were cut off from the various MCC pipe’s zones, produced from the 19Mn5 steel pipe and welded by electrodes UTP-068HH, YONI-13/55 and CT-36. Critical J – integraf JIc values were defined Rusing J–R curve test method, which results on determination of J – integral values as a function of crack extension ?a. The investigation enables to calculate critical crack length ?amax and ?ac sizes and J – integral JIc, Jmax and JPmax values, which are used to predict safe service lifetime of the cracked pipelines.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 4; 24-27
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic fracture criterion of Ti6Al4V titanium alloy under wide range of strain rates
Autorzy:
Moćko, W.
Kostrzewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/279621.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
titanium alloys
failure
fracture
anisotropy
Hopkinson bar
Opis:
The new fracture criterion taking into account stress triaxiality, strain rate and anisotropy is introduced in this paper. The model is capable to predict the influence of the loading direction on the fracture strain. The equation is applied to estimate the fracture locus of Ti6Al4V titanium alloy under quasi-static and dynamic loading regimes.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 741-745
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design criteria for scantling of longitudinal and transverse connections in the torsion box under fatigue loading
Autorzy:
Silva-Campillo, Arturo
Suárez-Bermejo, Juan Carlos
Herreros-Sierra, Miguel Ángel
Powiązania:
https://bibliotekanauki.pl/articles/1573576.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fatigue life
ship structures
crack growth
fracture
Opis:
Fatigue is one of the main failure modes in marine structures, and it is caused by the strong cyclic characteristics of the loads they support. This failure mode is amplified in areas of high stress concentration, such as at the intersection of primary and secondary elements. In this paper, a two-phase study is proposed that compares numerical and experimental results using a digital image correlation technique. The described procedure establishes selection, design, and scantling criteria and provides recommendations for the design of the transverse structure using specimens with different geometries. These geometries correspond to different designs for the transverse primary structure that use a longitudinal secondary stiffener with variable thickness and longitudinal spacing to transverse in a dynamic and quasi-static regime. The stress state for this regime is calculated based on the biaxiality indication concept, which uses the fatigue phenomenon (safety factor and sensitivity curves) and fracture mechanics (parameters of the Paris crack propagation law, correlation value, and law of variation of the stress intensity factor).
Źródło:
Polish Maritime Research; 2021, 2; 116-127
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 101

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