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    Wyświetlanie 1-26 z 26
    Tytuł:
    Why Aquinas Stopped Commenting on Boethius’s De Trinitate
    Autorzy:
    Ugwuanyi, Faustinus Ik.
    Powiązania:
    https://bibliotekanauki.pl/articles/507300.pdf
    Data publikacji:
    2020-03-30
    Wydawca:
    International Étienne Gilson Society
    Tematy:
    Aquinas
    Boethius
    De Trinitate
    Trinity
    Neoplatonism
    Opis:
    The article is an attempt to answer the question of why Aquinas stops his commentary on Boethius’s De Trinitate at question six, article four, whereas this is before the point in the treatise where Boethius gets to the heart of the subject matter. The author shows that Aquinas (1) decides to do so because the treatise cannot afford him the means of demonstrating the existence of the Trinity, (2) holds that, although rational explanations could be given in terms of proof of God’s existence, one cannot come to the knowledge of the truth of the existence of the Trinity by reason alone, and (3) concludes that, although we cannot prove the doctrine of the existence of the Trinity through philosophical demonstration, we can, however, show that this doctrine and other doctrines known through the light of faith are not contradictory.
    Źródło:
    Studia Gilsoniana; 2020, 9, 1; 167-188
    2300-0066
    Pojawia się w:
    Studia Gilsoniana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gods Covenants and the Sacraments of Christian Initiation
    Przymierze Boże i sakramenty chrześcijańskiej inicjacji
    Autorzy:
    Ugwuanyi, Faustinus Ik.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035165.pdf
    Data publikacji:
    2020-02-17
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    przymierza Boga
    sakramenty inicjacji chrześcijańskiej
    Chrystus − mądrość i moc Boga
    God's covenants
    the Sacraments of Christian initiation
    Christ−God's wisdom and power
    Opis:
    Katechetyczne wyjaśnienie Pisma Świętego i jego związku z liturgią stało się pilne, szczególnie w dzisiejszym świeckim społeczeństwie, w którym większość doktryn i praktyk religijnych Kościoła jest zagrożonych utratą znaczenia lub niewłaściwą interpretacją. Twierdzono również, że istnieje związek między przymierzami Boga a sakramentami inicjacji chrześcijańskiej w Nowym Testamencie. Artykuł ma na celu ukazanie biblijnej relacji sakramentów wtajemniczenia chrześcijańskiego z przymierzami Boga. Badanie to prowadzi nie tylko do wyjaśnienia ze względu na rosnącą świadomość i ciągłe pogłębianie rozumienia, ale także potwierdzenie znaczenia tych sakramentów i zasadniczej natury Chrystusa, który jest mądrością i mocą Boga.
    A Catechetical explanation of the Scriptures and their relation to liturgy has become urgent, especially in today's secular society where most of the Church's doctrines and faith-practices are under threat of either losing their meaning or misinterpreted. Also, it has been contended that there is a connection between God's covenants and the New Testament Sacraments of Christian initiation. The article aims to explain the Scriptural relationship of the Sacraments of Christian initiation with God's covenants. The relevance of the study is not only to provide an explanation because of the growing awareness and the constant search for explanations of things but also to reaffirm the importance of these Sacraments and the essential nature of Christ who is God's wisdom and power.
    Źródło:
    Roczniki Teologiczne; 2019, 66, 11; 35-50
    2353-7272
    Pojawia się w:
    Roczniki Teologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboulbeniales (Ascomycetes) from Latvia
    Gatunki Laboulbeniales (Ascomycetes) z terenu Łotwy
    Autorzy:
    De Kesel, A.
    De Kesel, I.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/67072.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    This contribution presents new and historical data on the Laboulbeniales of Latvian Coleoptera. An annotated checklist of 26 taxa is given, 13 are new for Latvia. Only six taxa (accepted names) from Briedis’ historical list were found again and six more need to be confirmed as Briedis’ material was lost. A neotype is indicated here for the extremely rare Laboulbenia elaphricolaSiemaszko et Siemaszko. Its morphology is discussed and compared with Laboulbenia elaphriSpegazzini and Laboulbenia vulgaris Peyr.
    W artykule przedstawiono zarówno nowe jak i historyczne dane o gatunkach Laboulbeniales występujących na łotewskich Coleoptera, przede wszystkim na Carabidaei Staphylinidae. Odnotowano 26 gatunków, z których 13 jest nowych dla Łotwy. Pierwsza lista gatunków Laboulbeniales z Łotwy została opublikowana w roku 1932 przez Briedisa w Acta Horti Botanici Universitatis Latviensis. Kolekcja Briedisa najprawdopodobniej zaginęła. Sześć potwierdzonych taksonów z listy Briedisa zostało na nowo odnalezionych, a dalsze sześć należy odszukać. Krytyczna lista 26 gatunków zawiera również uwagi taksonomiczne dotyczące m. in. Laboulbenia elaphricolaSiemaszko et Siemaszko.
    Źródło:
    Acta Mycologica; 2006, 41, 1
    0001-625X
    2353-074X
    Pojawia się w:
    Acta Mycologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trypanosoma [Herpetosoma] sp. in the social vole [Microtus socialis] for first time in Ukraine
    Autorzy:
    Karbowiak, G.
    Wita, I.
    Czaplinska, U.
    Polishchuk, I.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/837245.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    parasite
    Ukraine
    blood
    social vole
    vole
    Trypanosoma microti
    Microtus socialis
    small mammal
    Źródło:
    Annals of Parasitology; 1998, 44, 3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The social vole [Microtus socialis] as a zoonotic reservoir of Babesia microti in steppe zone of Ukraina
    Autorzy:
    Karbowiak, G.
    Wita, I.
    Czaplinska, U.
    Polishchuk, I.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/838857.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    parasite
    Ukraine
    Babesia microti
    social vole
    vole
    Microtus socialis
    Europe
    rodent
    small mammal
    Źródło:
    Annals of Parasitology; 1998, 44, 3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Transition Metal Carbides on Microstructure and Mechanical Properties of Ultrafine Tungsten Carbide Via Spark Plasma Sintering
    Autorzy:
    Lee, Jeong-Han
    Oh, Ik-Hyun
    Park, Hyun-Kuk
    Powiązania:
    https://bibliotekanauki.pl/articles/2048887.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    transition metal carbide
    spark plasma sintering
    grain growth inhibitor
    hardness
    Opis:
    WC-Co cemented carbides were consolidated using spark plasma sintering in the temperature 1400°C with transition metal carbides addition. The densification depended on exponentially as a function of sintering exponent. Moreover, the secondary (M, W)Cx phases were formed at the grain boundaries of WC basal facet. Corresponded, to increase the basal facets lead to the plastic deformation and oriented grain growth. A higher hardness was correlated with their grain size and lattice strain. We suggest that this is due to the formation energy of (M, W)Cx attributed to inhibit the grain growth and separates the WC/Co interface.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1029-1032
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does silicon increase the tolerance of a sensitive pepper genotype to salt stress?
    Autorzy:
    Altuntas, O.
    Dasgan, H.Y.
    Akhoundnejad, Y.
    Kutsal, I.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/12711848.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    We evaluated the growth performance, ion regulation, osmotic potential, and chlorophyll content of two pepper (Capsicum annuum) genotypes with different salinity tolerance levels (Karaisali is tolerant and Demre is sensitive to salinity) under saline conditions with the application of silicon (Si). Plants were grown in pots filled with vermiculite in control or saline conditions [150 mM sodium chloride (NaCl)] with or without 2 mM Si from potassium silicate for 60 days after sowing. Better growth effects due to Si application were observed in the sensitive pepper Demre than in Karaisali, particularly, the root and fruit growth were remarkably enhanced in Demre. Furthermore, Si application reduced sodium (Na) and chloride (Cl) concentrations and increased potassium (K) and calcium (Ca) concentrations in the leaves and roots. The reduction in Na concentration in the leaves due to Si application was 9% and 2% in Demre and Karaisali, respectively. Under saline conditions, the increase in K concentration due to Si application in the leaves was 11% and 14% in Demre and Karaisali, respectively. In addition, Si application resulted in an increase in K/Na ratios in the leaves by 22% and 17% in Demre and Karaisali, respectively, in the presence of 150 mM NaCl. The increase in Ca concentration in the roots due to Si application was 55% in Demre compared with only 9% in Karaisali. The addition of NaCl decreased the chlorophyll concentration in both the genotypes, but Si application increased it. This increase in chlorophyll concentration was higher in Demre than in Karaisali. Si application allowed both the genotypes to maintain higher osmotic potentials than those in untreated plants. As a result, it may be claimed that under salt stress, Si application has a more alleviative effect on the susceptible pepper genotypes (Demre) than on the tolerant one (Karaisali). This information could be useful for the practical application of Si under saline conditions.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 2; 87-96
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economic efficiency of community-based flood risk management: An empirical study from Indonesia
    Autorzy:
    Sedyowati, Laksni
    Chandrarin, Grahita
    Nugraha, Ginanjar I.K.
    Nugroho, Bambang
    Powiązania:
    https://bibliotekanauki.pl/articles/292291.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    community participation
    cost benefit analysis
    economic efficiency
    flood resilience
    flood risk management
    urban drainage
    Opis:
    Flood risk management are considerably influenced by several factors, such as all sources of flooding, social circum-stances, policy and even the potential for local economic growth. To encourage government, business, community and other parties to continue investing in flood risk management projects, it is necessary to give understanding that the projects can also provide economic benefits through systematic predictions and assessments of costs, benefits and social values, especially on flood-affected communities. This study aims: (1) to develop knowledge and understanding on small-scale flood risk management project in Malang City, Indonesia, and; (2) to assess the economic efficiency of the project investment considering all benefits, both monetary and non-monetary. The research method is a mixed method combining quantitative questionnaires (N = 53 from 162 families) with qualitative in-depth interviews (N = 10) and field observations. The runoff discharge and the inundation depth were calculated using hydrology and hydraulic analysis, while the economic efficiency was analysed using cost benefit analysis (CBA). The results show that the community-based flood risk management system can reduce the flood risk up to 30% compared to before the implementation of that system. This system also provides direct financial benefits through the use of drainage channels for fish and vegetables farming. It causes the increase of the net social benefit about 70–90% and the net present value (NPV) greater than zero (NPV > 0). Therefore, the project investment is recommended to be proceeded.
    Źródło:
    Journal of Water and Land Development; 2020, 46; 200-208
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of complex separation schemes and an error of separation products output determination
    Charakterystyka złożonych układów rozdziału oraz błąd oznaczania jego produktów
    Autorzy:
    Mladetskij, I.K.
    Pilov, P.I.
    Kobets, E.N.
    Markova, T.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/349611.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    algorytm wyznaczania wskaźników
    równania bilansu frakcji
    algorithm calculation of indicators
    equations of fraction balance
    Opis:
    Imperfection of dividing devices assumes their connection in technological chains. The more rigid the requirements to the cleanliness of products of division, the more complex (difficult) such chains. As a rule, it is the consecutive connections with feedbacks - recycles. The mathematical description of such circuits is bulky enough and in identical transformations gives a high probability of a mistake. With the purpose of formalization of the mathematical analysis of technologies of division we have offered the method which is turned into an algorithm of qualitative-quantity indicators calculation of division in each point of the dividing circuit which essence consists of drawing up of the equations of balance of narrow fractions of a product on each dividing operation. These equations form the system which gives required values of technological parameters when is solved. By results of the decision, it is possible to make the technological balance of the enterprise for any required interval of time. The reporting of the concentrating enterprise is connected to quantity (amount) of made production which is always expressed through an output (exit) of a product. It is the main characteristic of work of the enterprise. It is calculated on the basis of approbation of quality indicators. The more exact the approbation - the more exact the definition of the output and the more complex the scheme - the more complex the definition of the output's error. Thus, the formal algorithm of definition of an error of calculation of quantity indicators of complex dividing circuits is necessary. Numerical methods are most comprehensible to work on computers and consequently we have tested one of the ways of estimation of this error, which, in our opinion, is suitable for such analysis. The essence of the method consists in use of the function of disclosing of the valuable component, which acts on an input of the dividing circuit. For change of the condition of the circuit the increment is given with the help of this characteristic which is shifted concerning initial position. All other calculations are carried out on earlier, mentioned algorithm.
    Niedokładność pracy urządzeń rozdzielających wynika z ich połączeń w układach technologicznych. Ostrzejsze wymagania stawiane jakości produktów poszczególnych sekcji powodują skomplikowanie układów. Z reguły jest to związane z zawrotami (recyklami). Matematyczny opis takich obiegów jest bardzo niewygodny i w identycznych transformacjach daje wysokie prawdopodobieństwo błędu. W celu formalizacji analizy matematycznej technologii sekcji autorzy proponują metodę, która jest sprowadzona do algorytmu obliczeń wskaźników jakościowo--ilościowych sekcji w każdym punkcie obiegu rozdzielającego, którego istota polega na wyprowadzeniu równań bilansu wąskich frakcji produktu w każdej operacji rozdziału. Równania te tworzą układ, który pozwala określać wymagane wartości parametrów technologicznych. Możliwe jest wykonanie bilansu technologicznego ciągu w każdym ustalonym odcinku czasu. Opis ciągu technologicznego jest związany z wielkością produkcji. Jest to główna charakterystyka pracy ciągu. Kalkulowana jest ona na podstawie kwalifikacji wskaźników jakościowych. Im bardziej dokładna kwalifikacja, tym bardziej dokładne określenie wyjścia i bardziej złożony schemat oraz tym bardziej złożone określenie błędu na wyjściu. Format algorytmu określania błędu obliczeń wskaźników jakościowych złożonych układów rozdziału jest niezbędny. Metody numeryczne są najbardziej odpowiednie i dlatego to właśnie one były testowane przy estymacji błędów. Istota metody polega na użyciu funkcji odsłaniania (uwalniania) składników wartościowych, która działa na wejściu obiegu rozdziału.
    Źródło:
    Górnictwo i Geoinżynieria; 2006, 30, 3/1; 229-245
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current status of intestinal parasitic infections among inhabitants of the Ghazni and Parwan provinces, Afghanistan
    Autorzy:
    Korzeniewski, Krzysztof
    Chin Chung, Won
    Augustynowicz, Alina
    Lass, Anna
    Jong IK, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/553070.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
    Tematy:
    intestinal parasites
    helminths
    protozoa
    Afghanistan.
    Źródło:
    Family Medicine & Primary Care Review; 2017, 1; 23-28
    1734-3402
    Pojawia się w:
    Family Medicine & Primary Care Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tandonia totevi (Wiktor, 1975) (Pulmonata: Milacidae) in Bulgaria and north eastern Greece. Redescription
    Autorzy:
    Schneppat, U.E.
    Georgiev, D.G.
    Dedov, I.K.
    Wondrak, G.
    Knechtle, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/83237.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    Tandonia totevi
    Pulmonata
    Milacidae
    Bulgaria
    Greece
    slug
    anatomy
    redescription
    biogeography
    ecology
    Peloponnese
    Opis:
    New materials of Tandonia totevi (Wiktor, 1975) from Bulgaria have enabled the authors to prepare a detailed redescription and to distinguish the species from those from southern Greece which have been confused with T. totevi for almost 30 years. From the southern Greek Islands, the Peloponnese and the island of Euboea at least three more species need to be described and discriminated from T. totevi. The spermatophores of T. totevi from Bulgaria are described here for the first time, as is an intra-integumental glandular secreting organ of unknown function. The first description of spermatozoa of T. totevi is included. The first photographs of living specimens and the first observations on the behaviour and ecology are provided.
    Źródło:
    Folia Malacologica; 2011, 19, 4
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applicability Study of Co and Eu Extraction Using Solvent from Ca Rich HCl Solution
    Autorzy:
    Oh, Maengkyo
    Lee, Keunyoung
    Foster, Richard I.
    Kim, Ik-Soo
    Lee, Chang-Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/2203724.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solvent extraction
    radioactive wastewater
    waste valorization
    Cyanex 272
    Cyanex 301
    Opis:
    This study was conducted to treat radioactive acidic wastewater, which contained radioactive 60Co and 152Eu. The wastewater can be generated during a decommissioning project to reduce the volume of radioactive concrete waste from nuclear facilities. With a variety of methods for separating the radioactive nuclides available, we evaluated the separation applicability of the solvent extraction method. From our results, Co and Eu could be easily extracted from the Ca rich wastewater using Cyanex301 (Co extraction (%) 99.8, Eu extraction (%) 99.6) without Ca extraction. On the other hand, Eu could be selectively separated by Cyanex272 (Eu extraction (%) 99.1) without Co and Ca extraction at pH 2~3. Therefore, the extraction method can be tailored according to the target radionuclides present in the wastewater and be selectively applied to the overall treatment process. By extracting radioactive Co and Eu from acidic wastewater to below the discharge criteria, treated wastewater could be regarded as non-radioactive industrial waste, to be economically and easily handled. Moreover, it may be possible to reuse separated Co and Eu for research and industrial applications by realizing waste valorization.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 123--126
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Superior Thermal Protective Coating on Carbon Composites
    Autorzy:
    Bae, Soo Bin
    Lee, Ji Eun
    Paik, Jong Gyu
    Cho, Nam Choon
    Lee, Hyung Ik
    Powiązania:
    https://bibliotekanauki.pl/articles/354076.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    silicon carbide
    CVR
    CVD
    Opis:
    A superior SiC based thermal protection coating process for carbon composite, which can be especially effective in a hot oxidizing atmosphere, was established in this study. A multi-coating process based on a combination of Chemical Vapor Reaction (CVR) and Chemical Vapor Deposition (CVD) was developed. Various protective coating layers on carbon composite were tested in hot oxidizing surroundings and the test results verified that the thermal ablation rate could be dramatically reduced down to 3.8% when the protective multi-coating was applied. The thermal protection mechanism of the coating layers was also investigated.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1371-1375
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consolidation and Oxidation of Ultra Fine WC-Co-HfB2 Hard Materials by Spark Plasma Sintering
    Autorzy:
    Park, Hyun-Kuk
    Oh, Ik-Hyun
    Kim, Ju-Hun
    Hong, Sung-Kil
    Lee, Jeong-Han
    Powiązania:
    https://bibliotekanauki.pl/articles/2049178.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    hafnium diboride
    spark plasma sintering
    oxidation
    mechanical property
    Opis:
    In this study, a novel composite was fabricated by adding the Hafnium diboride (HfB2) to conventional WC-Co cemented carbides to enhance the high-temperature properties while retaining the intrinsic high hardness. Using spark plasma sintering, high density (up to 99.4%) WC-6Co-(1, 2.5, 4, and 5.5 wt. %) HfB2 composites were consolidated at 1300°C (100°C/min) under 60 MPa pressure. The microstructural evolution, oxidation layer, and phase constitution of WC-Co-HfB2 were investigated in the distribution of WC grain and solid solution phases by X-ray diffraction and FE-SEM. The WC-Co-HfB2 composite exhibited improved mechanical properties (approximately 2,180.7 kg/mm2) than those of conventional WC-Co cemented carbides. The high strength of the fabricated composites was caused by the fine-grade HfB2 precipitate and the solid solution, which enabled the tailoring of mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 997-1000
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the Durability of SiC-Coated Carbon Composites Under Thermal Shock Conditions
    Autorzy:
    Lee, Ji Eun
    Bae, Soo Bin
    Cho, Nam Choon
    Lee, Hyung Ik
    Meng, Zicheng
    Lee, Kee Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049309.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    carbon composites
    silicon carbide coating
    chemical vapor deposition
    chemical vapor reaction
    Opis:
    Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 777-782
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Si Addition on Microstructure and Mechanical Properties of the Al Alloys with High Cr Content Prepared by Gas Atomization and SPS Processes
    Autorzy:
    Kim, Yong-Ho
    Oh, Ik-Hyun
    Yoo, Hyo-Sang
    Park, Hyun-Kuk
    Lee, Jung-Han
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Cr-Si
    gas atomization
    spark plasma sintering
    powder
    rapid solidification
    Opis:
    This research describes effects of Si addition on microstructure and mechanical properties of the Al-Cr based alloys prepared manufactured using gas atomization and SPS (Spark Plasma Sintering) processes. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). Microstructure of the as-atomized Al-Cr-Si alloys with high contents of Cr and Si was composed multi-phases with hard and thermally stable such as Al13Cr4Si4, AlCrSi, Al8Cr5 and Cr3Si intermetallic compounds. The average hardness values were 703 Hv for S5, 698 Hv for S10 and 824 Hv for S20 alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with hard and thermally stable and fine microstructure by the addition of high Cr and Si using rapid solidification and SPS process.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1045-1049
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Process Variables on Friction Stirred Microstructure and Surface Hardness of AZ31 Magnesium Alloy
    Autorzy:
    Kim, Jae-Yeon
    Hwang, Jung-Woo
    Lee, Seung-Mi
    Hyun, Chang-Young
    Park, Ik-Keun
    Byeon, Jai-Won
    Powiązania:
    https://bibliotekanauki.pl/articles/355106.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir process
    AZ31 alloy
    diamond particle
    process variable
    grain size
    Opis:
    Effects of various friction stir processing (FSP) variables on the microstructural evolution and microhardness of the AZ31 magnesium alloy were investigated. The processing variables include rotational and travelling speed of the tool, kind of secondphase (i.e., diamond, Al2 O3 , and ZrO2 ) and groove depth (i.e., volume fraction of second phase). Grain size, distribution of second phase particle, grain texture, and microhardness were analyzed as a function of the FSP process variables. The FSPed AZ31 com-posites fabricated with a high heat input condition showed the better dispersion of particle without macro defect. For all composite specimens, the grain size decreased and the microhardness increased regardless of the grooved depth compared with that of the FSPed AZ31 without strengthening particle, respectively. For the AZ31/diamond composite having a grain size of about 1 μm, microhardness (i.e., about 108 Hv) was about two times higher than that of the matrix alloy (i.e., about 52 Hv). The effect of second phase particle on retardation of grain growth and resulting hardness increase was discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 907-911
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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