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Wyświetlanie 1-15 z 69
Tytuł:
The Odyssey of a Diptych. Issues of Authorship and Provenience of the Virgen Dolorosa and the Cristo Coronado de Espinas from the Former Collection in Gołuchów
Wędrówka dyptyku. Problem autorstwa i proweniencji wizerunków „Mater Dolorosa” i „Chrystusa cierniem koronowanego” z dawnej kolekcji w Gołuchowie
Autorzy:
Rojewski, Oskar J.
Diéguez-Rodríguez, Ana
Powiązania:
https://bibliotekanauki.pl/articles/23352235.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Sztuki PAN
Tematy:
Prymitywiści niderlandzcy
Albrecht Bouts
sztuka XVI w.
Chrystus cierniem koronowany
Mater Dolorosa
Flemish primitives
16th-Century art
Christ Crowned with Thorns
Opis:
This paper aims to gather all information about the diptych of Mater Dolorosa and Christ Crowned with Thorns, which until 2023 stayed in the Provincial Museum of Pontevedra (Museo Provincial de Pontevedra) in Spain. The research addresses two aspects of the diptych: the controversy of its attribution to a circle of Albrecht Bouts or his follower and the diptych’s arrival at the Provincial Museum of Pontevedra. This study explains that this diptych’s former attributions cannot be supported due to his style and the new research about Bout’s workshop practices. Finally, it gathers all the documentary sources about its arrival at the Pontevedra Museum.
Wędrówka dyptyku. Problem autorstwa i proweniencji wizerunków „Mater Dolorosa” i „Chrystusa cierniem koronowanego” z dawnej kolekcji w Gołuchowie. Niniejszy artykuł stanowi analizę dyptyku z przedstawieniami Mater Dolorosa i Chry- stusa cierniem koronowanego, znajdującego się do 2023 r. w kolekcji Museo Provincial de Pontevedra w Hiszpanii. Przeprowadzone badania miały na celu wyjaśnienie dwóch kwestii: kontrowersji związanych z atrybucją dzieła kręgowi Albrechta Boutsa oraz z historią jego identyfikacji i dotarcia na Półwysep Iberyjski. W oparciu o analizę stylistyczną oraz ostatnie badania nad warsztatem rodziny Bouts, Autorzy proponują nową hipotezę na temat pochodzenia obrazów. Badania archiwalne i wnikliwa lek- tura literatury przedmiotu pozwoliły także na wyjaśnienie okoliczności przekazania dyptyku do Muzeum w Pontevedra.
Źródło:
Biuletyn Historii Sztuki; 2023, 85, 1; 47-68
0006-3967
2719-4612
Pojawia się w:
Biuletyn Historii Sztuki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of tree diversity and stand structure on above-ground carbon storage in evergreen broad-leaved and deciduous forests in Southeast Vietnam
Autorzy:
Tuan, N.T.
Rodriguez-Hernandez, D.I.
Tuan, V.C.
Quy, N.V.
Obiakara, M.C.
Hufton, J.
Powiązania:
https://bibliotekanauki.pl/articles/2130199.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Biodiversity assessment
Ecosystem functioning
Taxonomic diversity
Natural forests
Stand structure
Opis:
Understanding the relationship between tree species diversity and above-ground carbon (AGC) storage in tropical forests is essential for a sustainable flow of ecosystem goods and services. Although tropical forests of Vietnam are of particular interest due to their high biodiversity and carbon density, few studies have evaluated the relative importance of species composition, tree species diversity and forest structure on AGC storage by forest vegetation type. In this study, we tested for the influence of taxonomic diversity, forest structure and species composition on AGC storage in evergreen broad-leaved and deciduous forests of Southeast Vietnam. Data was collected within 137 rectangular plots (25 m × 20 m), randomly selected across a deciduous forest (DF) and four evergreen broad-leaved forest (EB) categories, with different standing volumes levels: very poor (EBG), poor (EBP), medium (EBM) and rich (EBR). In total, we identified 3687 individuals from 110 tree species belonging to 46 families in 6.85 hectares of sampled area. AGC storage significantly differed among forest categories, ranging from 14.81 Mg ha−1 in EBG to 146.74 Mg ha−1 in EBR. There was higher AGC in the medium diameter class (20-40 cm), except for EBR where there was higher AGC within individuals of 40-60 cm in diameter. Taxonomic diversity was weakly correlated with AGC while stand structure (stem density and maximum diameter) were strongly correlated. Our results suggest that maintaining the abundance distributions of remnant tree species, particularly that of large trees, is one important method to enhance AGC storage in the tropical ecosytems of southern Vietnam.
Źródło:
Dendrobiology; 2022, 88; 38-55
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mental health of Filipino seafarers: the contributory factors and the strategies applied onboard ship
Autorzy:
Sarinas, B. G. S.
Botante, J. D. D.
Nacion, J. S.
Bernas, M. L. B.
Rodriguez, O.
Powiązania:
https://bibliotekanauki.pl/articles/2172470.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
mental health
seafarers
Filipino
onboard test
stress fatigue
seafarers problems
Opis:
Mental health is equally important with physical health. Many reports found out that poor mental health is one of the major factors of depression among seafarers. This study ascertains the factors affecting mental health and the strategies applied by Filipino seafarers to combat these issues. A survey was used as a research design. A total of 100 seafarers taken through convenience and snowball sampling answered the validated researcher-made questionnaire. The questionnaire was sent in the JBLFMU Alumni Portal, messenger, and Gmail. Frequency, percentage, and rank were used. Themes were used to classify the strategies applied by seafarers to counteract mental health issues onboard ship. The results revealed that the major contributory factor affecting the mental health of Filipino seafarers is stress, while they believed that a positive outlook in life makes one’s self free from mental health problems onboard. The top three factors are stress, fatigue, and separation from families and friends. The top three strategies to counteract factors that affect seafarers’ mental health onboard ship are staying positive, socializing with crewmates, and communicating with family.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 125--134
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Migration Coverage in Europe, Russia and the United States
Autorzy:
Kreutler, Marcus
Fengler, Susanne
Asadi, Nastaran
Bodrunova, Svetlana
Budivska, Halyna
Diop, Layire
Ertz, Georgia
Gigola, Daria
Katus, Eszter
Kovacs, Denisa
Kuś, Michał
Láb, Filip
Litvinenko, Anna
Mack, Johanna
Maier, Scott
Pinto Martinho, Ana
Matei, Antonia
Miller, Kaitlin C.
Oppermann, Lisa
Pérez Vara, Eva
Polyák, Gábor
Ravisankar, Rajeev
Rodríguez Pérez, Carlos
Semova, Dimitrina J.
Skleparis, Dimitris
Splendore, Sergio
Štefaniková, Sandra
Szynol, Adam
Telo, Décio
Zguri, Rrapo
Powiązania:
https://bibliotekanauki.pl/articles/2152496.pdf
Data publikacji:
2022-09-22
Wydawca:
Polskie Towarzystwo Komunikacji Społecznej
Tematy:
comparative analysis
journalism
migration
refugee
media coverage
Opis:
Six years after the so-called ‘refugee crisis’ in 2015, the European Union remains divided on questions of migration and asylum policy. The issue also remains high on the agendas of the USA and Russia, two other key destination countries with immigration from Latin America and the Post-Soviet space. This article presents results from a comparative study of news coverage in 17 countries, focusing on 10 EU member states in Western and Central Eastern Europe (CEE), the USA and Russia. The intensity of coverage was remarkably different, with Hungary’s and Germany’s media standing out while Russian media displayed relatively low levels of coverage. Individual migrants and refugees were most visible in the two outlets from the USA. Media in CEE countries tended towards a more critical approach than media in Western Europe. However, differences between most countries’ pairs of analyzed media outlets indicate a more pluralistic debate than frequently assumed.
Źródło:
Central European Journal of Communication; 2022, 15, 2(31); 202-226
1899-5101
Pojawia się w:
Central European Journal of Communication
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protection of Lexicographic Product Graphs
Autorzy:
Klein, Douglas J.
Rodríguez-Velázquez, Juan A.
Powiązania:
https://bibliotekanauki.pl/articles/32361746.pdf
Data publikacji:
2022-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
lexicographic product
weak Roman domination
secure domination
total domination
double total domination
Opis:
In this paper, we study the weak Roman domination number and the secure domination number of lexicographic product graphs. In particular, we show that these two parameters coincide for almost all lexicographic product graphs. Furthermore, we obtain tight bounds and closed formulas for these parameters.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 1; 139-158
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the pre-injection system of a marine diesel engine through multiple-criteria decision-making and artificial neural networks
Autorzy:
Rodriguez, C. G.
Lamas, M. I.
Rodriguez, J. D.
Abbas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2033205.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine engine
emissions
consumption
artificial neural networks
multi-criteria decision making
computational fluid dynamics
Opis:
The present work proposes several pre-injection patterns to reduce nitrogen oxides in the Wartsila 6L 46 marine engine. A numerical model was carried out to characterise the emissions and consumption of the engine. Several pre-injection quantities, durations, and starting instants were analysed. It was found that oxides of nitrogen can be noticeably reduced but at the expense of increasing consumption as well as other emissions such as carbon monoxide and hydrocarbons. According to this, a multiple-criteria decision-making (MCDM) model was established to select the most appropriate parameters. Besides, an artificial neural network (ANN) was developed to complement the results and analyse a huge quantity of alternatives. This hybrid MCDM-ANN methodology proposed in the present work constitutes a useful tool to design new marine engines.
Źródło:
Polish Maritime Research; 2021, 4; 88-96
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a sheltered euhaline area of the Southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition
Autorzy:
Bilbao, J.
Muniz, O.
Rodriguez, J.G.
Revilla, M.
Laza-Matinez, A.
Seoane, S.
Powiązania:
https://bibliotekanauki.pl/articles/2078991.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton community
phytoplankton composition
biomass
physicochemical variation
aquaculture
mussel
Biscay Bay
Opis:
This study describes the phytoplankton community in sheltered euhaline waters of the Basque coast (southeastern Bay of Biscay). Phytoplankton composition, cell size, abundance, biomass and the presence of potentially toxic taxa, together with chlorophyll a, nutrients and hydrographic and optical conditions were measured, from August 2016 to August 2017, in the Mutriku port, with the main aim of assessing the suitability of the phytoplankton community as a food resource for bivalves. The water column in Mutriku showed the typical environmental conditions of Basque marine waters, with no significant nutrient enrichment caused by anthropogenic pressures. Haptophytes represented the greatest contribution to cell abundance (31—47%), and diatoms were the dominant group in terms of biomass (52—79%), which could favour mussel growth due to their high fatty acid content. In addition, the size structure of the phytoplankton community was suitable for mussel ingestion, since the predominant cell size was 2—20 μm. Regarding toxic phytoplankton, the genera that pose a risk for human health and those that affect negatively mussel physiology and survival were considered. Altogether, ten toxic phytoplankton taxa were identified, contributing in less than 5% to the total cell abundance of Mutriku. However, median chlorophyll a concentration was low (0.5 μg L−1), reflecting the oligotrophic conditions of the area. Therefore, even if the composition of the phytoplankton community could be favourable for bivalve aquaculture, biomass values are low compared to other zones of bivalve production.
Źródło:
Oceanologia; 2021, 63, 1; 12-26
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kelvin-Helmholtz instabilities in the Colorado River Delta, Gulf of California
Autorzy:
Carbajal, N.
Vargas, J.T.
Rodriguez, J.H.G.
Montano Ley, Y.
Salas de Leon, D.A.
Powiązania:
https://bibliotekanauki.pl/articles/2078904.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Kelvin-Helmholtz instability
Colorado River Delta
tidal current
bottom sediment
bathymetry
suspended sediment
satellite image
Opis:
In the Colorado River Delta, the interaction of tidal currents and sea-bottom sediment formed, in geological times, large-scale seabed patterns known as sandbanks. These patterns are oriented along the delta, almost parallel to the dominant tidal flow, with the bathymetry having an undulating character across the delta. Calculations and analysis showed that the interaction of tidal currents with the bathymetry causes velocity shears, faster flowing over the ridges than in the troughs. Kelvin-Helmholtz instabilities emerge from the velocity shear, and a large amount of suspended sediment makes the instabilities visible in satellite images. The physical and dynamic conditions allowed us to find an explanation for the existence of these Kelvin-Helmholtz instabilities. Since sandbanks have been observed in different seas such as the North Sea, The Gulf of Korea, the Gulf of Khambhat in India, the Jiangsu coast in China, the Persian Gulf, and Moreton Bay in Australia, the results suggest the existence of instabilities in these areas. Satellite images, intense tidal currents, undulating topography, and suspended sediment made it possible to explain the generation and identification of KelvinHelmholtz instabilities.
Źródło:
Oceanologia; 2021, 63, 3; 321-328
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Participation of interferon type I during canine parvovirus infection
Autorzy:
Reyes-Cruz, T.
Martínez-Gómez, D.
Verdugo-Rodríguez, A.
Bustos-Martínez, J.
López-Islas, J.
Méndez-Olvera, E.T.
Powiązania:
https://bibliotekanauki.pl/articles/2087108.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
canine parvovirus
antiviral immunity
IFNβ
viral pathogenesis
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 3; 375-384
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on health risk factors as a basis to implement programs that promote a nutritional culture in students of the la Sabana University
Autorzy:
Rodriguez, S.
Martinez, M.
Segnini, F.
Cajiao, V.
Aivasovsky, I.
Celis, L.G.
Ayala, J.
Rozo, C.
Russi, A.
Girata, V.
Almonacid, C.C.
Powiązania:
https://bibliotekanauki.pl/articles/2087202.pdf
Data publikacji:
2021
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
health promotion
disease prevention
obesity
non-communicable diseases
healthy lifestyle
Opis:
Background. Nowadays the importance of lifestyles in the prevention of type 2 diabetes and the metabolic syndrome has been largely accertained. Objective. The purpose of our work is to implement programs that promote a nutritional culture in adolescents and young adults of the La Sabana University. Methods. The methodology entailed, after the corresponding informed consent, taking measures of the triceps and supraescapular skinfolds, waist circumference, body mass index (BMI), lean mass, and fat mass. Fasting blood samples were also taken to quantify cholesterol, triglycerides, high density lipoprotein (HDL) and low density lipoprotein (LDL). Results. The results obtained show that of the 165 students, 10.3% were underweight, 13.93% were overweight and 0.6% were obese. With regards to gender, 4.8% of the men and 9% of the women were overweight, 3% of the men and 7.2% of the women were underweight, and 0.6% of the women were obese. The blood chemistry showed that 30% had hypercholesterolemia, 18% hypertriglyceridemia, 17% reported low HDL levels and 67% reported high LDL levels. Of all the cases studied, 40% are at risk of a metabolic syndrome. 60% claimed not to practice any physical activity - especially women who reported 44.70%. Conclusions. These findings have allowed us at the institution to implement a culture of healthy habits. The have also allowed us to identify students with risk factors for type 2 diabetes and metabolic syndrome. This is why the cardio- metabolic monitoring and control based on healthy eating and physical activity are important.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2021, 72, 1; 89-94
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhomogeneity detection in phytoplankton time series using multivariate analyses
Autorzy:
Muniz, O.
Rodriguez, J.G.
Revilla, M.
Laza-Martinez, A.
Seoane, S.
Franco, J.
Powiązania:
https://bibliotekanauki.pl/articles/2079181.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton community
monitoring programme
uncertainty
multivariate analysis
inhomogeneity
Opis:
Phytoplankton communities have long been used as water quality indicators within environmental policies. This has fostered the development of national and international phytoplankton monitoring programs, but these networks are subject to sources of uncertainty due to laboratory issues. Nevertheless, studies regarding the interference associated with these aspects are not well-documented. Hence, a long time series (2003–2015) from the Basque continental shelf (southeastern Bay of Biscay) was analyzed to evaluate the uncertainty given by laboratory strategies when studying phytoplankton variability. Variability in phytoplankton communities was explained not only by environmental conditions but also by changes in fixatives (glutaraldehyde and acidic Lugol's solution) and laboratory staff. Based on Bray-Curtis distances, phytoplankton assemblages were found to be significantly dissimilar according to the effect of changes in the specialist handling the sample and the employed fixative. The pair-wise permutational multivariate analysis of variance (PERMANOVA) showed significant differences between the two fixatives utilized and also between the three taxonomists involved. Thus, laboratory-related effects should be considered in the study of phytoplankton time series.
Źródło:
Oceanologia; 2020, 62, 3; 243-254
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of an InAs/GaSb superlattice barrier photodetector covering the full LWIR spectral domain
Autorzy:
Alchaar, R.
Rodriguez, J.-B.
Höglund, L.
Naureen, S.
Costard, E.
Christol, P.
Powiązania:
https://bibliotekanauki.pl/articles/1818247.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
barrier photodetector
InAs/GaSb type-2 superlattice
long wavelength infrared
performance analysis
Opis:
In this paper, we present the electrical and electro-optical characterizations of an InAs/GaSb type-2 superlattice barrier photodetector operating in the full longwave infrared spectral domain. The fabricated detectors exhibited a 50% cut-off wavelength around 14 μm at 80 K and a quantum efficiency slightly above 20%. The dark current density was of 4.6×10⁻² A/cm² at 80 K and a minority carrier lateral diffusion was evaluated through dark current measurements on different detector sizes. In addition, detector spectral response, its dark current-voltage characteristics and capacitance-voltage curve accompanied by electric field simulations were analyzed in order to determine the operating bias and the dark current regimes at different biases. Finally, dark current simulations were also performed to estimate a minority carrier lifetime by comparing experimental curves with simulated ones.
Źródło:
Opto-Electronics Review; 2020, 28, 3; 164--170
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radon measurements in groundwater mines in La Palma and El Hierro, Canary Islands (Spain)
Autorzy:
Santamarta, Juan C.
Gutiérrez, Luis Enrique Hernández
Martín, Jesica Rodríguez
Pérez, Lina
Bascones, Rafael J. Lario
Moro, Ángel Morales González
Pérez, Noelia Cruz
Powiązania:
https://bibliotekanauki.pl/articles/1853859.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
promieniowanie
wody podziemne
kopalnia
Wyspy Kanaryjskie
radon gas
radiation
groundwater
mines
Canary Islands
Opis:
In the Canary Islands, groundwater is the main source of drinking water. Groundwater mines have been the system used by the engineers of the archipelago to collect water from the ground. The Canary Islands are volcanic with soils characterized by being rich in uranium, the disintegration of which gives rise to radon gas. In this study, radon gas levels in the mines on two islands of the archipelago have been measured to study exposure to this gas in the galleries. Results show values much higher than the European regulatory limit concentrations.
Źródło:
Archives of Mining Sciences; 2020, 65, 4; 869-876
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single spiking neuron multi-objective optimization for pattern classification
Autorzy:
Juarez-Santini, Carlos
Ornelas-Rodriguez, Manuel
Soria-Alcaraz, Jorge Alberto
Rojas-Domínguez, Alfonso
Puga-Soberanes, Hector J.
Espinal, Andrés
Rostro-Gonzalez, Horacio
Powiązania:
https://bibliotekanauki.pl/articles/385022.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
multi-objective optimization
spiking neuron
pattern classification
Opis:
As neuron models become more plausible, fewer computing units may be required to solve some problems; such as static pattern classification. Herein, this problem is solved by using a single spiking neuron with rate coding scheme. The spiking neuron is trained by a variant of Multi-objective Particle Swarm Optimization algorithm known as OMOPSO. There were carried out two kind of experiments: the first one deals with neuron trained by maximizing the inter distance of mean firing rates among classes and minimizing standard deviation of the intra firing rate of each class; the second one deals with dimension reduction of input vector besides of neuron training. The results of two kind of experiments are statistically analyzed and compared again a Mono-objective optimization version which uses a fitness function as a weighted sum of objectives.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 1; 73-80
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of SrTiO3 by the Calcination of SrCO3 and TiO2 Mixtures Intensively Ground by Means of High Energy Milling
Autorzy:
Rocha-Rangel, Enrique
Pech-Rodríguez, Wilian J.
López-Hernández, Juan
Calles-Arriaga, Carlos A.
Armendáriz-Mireles, Eddie N.
Castillo-Robles, José A.
Rodríguez-García, José A.
Powiązania:
https://bibliotekanauki.pl/articles/356247.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SrTiO3
mechanochemistry
insulating ceramics
perovskite
Opis:
A SrTiO3 electroceramic with perovskite structure was produced by the calcination of a mixture of SrCO3 and TiO2 intensively grounded by high energy milling. For this purpose, raw materials were mixed in stoichiometric amounts in a planetary type mill; the obtained powder mixture was calcined for 2 h at temperatures between 800 and 1300°C. Samples resulting from the calcination were characterized by XRD, FTIR, SEM analysis and electrical measurements. From XRD, it was determined that the SrTiO3 formed presents the cubic structure of perovskite. The complete reaction for SrTiO3 compound formation occurs at 1200°C. Micrograph observations indicate the presence of a homogeneous microstructure with tiny grain size. The measured values of electrical resistivity were within the typical range of insulating materials.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 621-626
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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