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Wyszukujesz frazę "Martinez, E." wg kryterium: Autor


Tytuł:
A new Middle Devonian heterocoral from Spain
Autorzy:
Fernandez-Martinez, E
Tourneur, F.
Lopez-Alcantara, A.
Powiązania:
https://bibliotekanauki.pl/articles/21951.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Cantabrian Zone
Heterocorallia
Eifelian
Devonian
heterocoral
Middle Devonian
paleontology
Spain
Opis:
Most of the heterocorals described up to now from strata older than Famennian are of doubtful affinities. Numerous specimens of the new genus and new species here described were collected during a sedimentological study of the Santa Lucía Formation in La Pola de Gordon (León province, Cantabrian Mountains, NW Spain). Stellaphyllia luciensis gen. et sp. nov. is characterized by cylindrical coralla, with a diameter of less than 2 mm and more than 2 cm long, having stellate to more or less rounded outer profile. Four to six septa, less frequently seven, are cojoined axially by a short oblique septum. The few tabulae present are steeply arched. The microstructure of the septa and interseptal elements shows thin elongate microlamellae parallel to a median plate which is granular in appearance. The new genus dated to the lower Eifelian age could be important in understanding the early phylogeny and origin of the order Heterocorallia.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaporation of magnetically treated water and NaCl solutions
Autorzy:
Carbonell, M.V.
Martinez, E.
Diaz, J.E.
Powiązania:
https://bibliotekanauki.pl/articles/26429.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
evaporation
physicochemical property
solution
magnetic treatment
sodium chloride
water change
water
magnetohydrodynamics
Źródło:
International Agrophysics; 2002, 16, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of quadrilateral discontinuity size on the energy absorption of structural steel profiles
Wpływ wielkości czworobocznych nieciągłości na pochłanianie energii w stalowych profilach strukturalnych
Autorzy:
Estrada, Q.
Szwedowicz, D.
Majewski, T.
Martinez, E.
Rodriguez-Mendez, A.
Powiązania:
https://bibliotekanauki.pl/articles/301235.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
thin-walled structure
geometrical discontinuities
finite element method
energy performance
struktury cienkościenne
nieciągłości geometryczne
metoda elementów skończonych
pochłanianie energii
Opis:
In this paper the effect of discontinuity size on energy absorption performance of steel square profiles is reported. The analysis consists of finite element simulations and experimental results of the compression strength of steel profiles with discontinuities. The discontinuities were placed at the mid span of the profiles in two walls opposite to each other. Square, rectangular and diamond initiators were evaluated at different scales. The numerical results determined the size intervals that present a good energy absorption performance in each case. Energy absorption capabilities were increased up to 12.54% with respect to a structure without discontinuities. Additionally, the peak load value (Pmax) was decreased 25.97% with the implementation of a diamond initiator. For structures with discontinuities with major axis close to the profile width, a buckling effect was observed. Finally, it was observed that the size of the initiators contributes to reduce the peak load (Pmax) value.
W pracy przedstawiono analizę wpływu rozmiaru nieciągłości na pochłanianie energii przez stalowe profile o przekroju kwadratowym. Analiza przedstawia wyniki symulacji elementami skończonymi próby ściskania profili stalowych z nieciągłościami oraz porównanie z danymi eksperymentalnymi. Nieciągłości zostały usytuowane w środku profilu w dwóch przeciwległych ścianach. W pracy zostały przebadane nieciągłości o formach kwadratowych, prostokątnych i rombowych dla różnych wymiarów. Stwierdzono wzrost o 12,54% możliwości pochłaniania energii w porównaniu dla struktur bez nieciągłości. Dodatkowo, w przypadku nieciągłości rombowych stwierdzono spadek wartości siły maksymalnej (Pmax) o 25,97%. Zaobserwowano występowanie efektu wyboczenia dla nieciągłości rombowej gdy wymiar jej osi zbliża się do szerokości profilu. Zaobserwowano, ze rozmiar nieciągłości wpływa na redukcje wartości maksymalnego obciążenia oraz w tym samym czasie na obniżenie pochłanianej energii.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 2; 186-193
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Assisted Cracking in a Microalloyed Steel Subjected to a Rapid Thermal Cycle at High Temperature
Autorzy:
Lopez-Martinez, E.
Vázquez-Gómez, O.
Vergara-Hernández, H. J.
Campillo, B.
Powiązania:
https://bibliotekanauki.pl/articles/352035.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
persistent slip mark
fatigue crack growth
hydrogen enhanced local plasticity
microalloyed steel
Opis:
In a martensitic-bainitic microalloyed steel, the effect of hydrogen on fatigue crack growth was studied using rotary bending fatigue tests. The steel was subjected to a rapid thermal cycle to get a microstructure similar to that which would be formed within the coarse-grained heat-affected zone of a weld. Crack growth was monitored as a function of the number of cycles applied during fatigue tests on three types of specimens: 1) those without hydrogen charge, 2) those charged with hydrogen and 3) those charged with hydrogen which was then discharged through low-temperature heat treatment. All types showed persistent slip marks, and cracks propagated along high-shear-stress planes. In the presence of hydrogen, crack growth was affected by microstructural defects caused by the hydrogen charging process, and the persistent slip marks developed in an area closer to the crack tip and crack path. On the contrary, without hydrogen, crack growth occurred perpendicular to the applied force, and the persistent slip marks were fewer in number and further from the crack tip and crack path. This indicates that the plasticity increased (i.e., the damage that occurred in the presence of hydrogen matched the hydrogen-enhanced local plasticity mechanism).
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 315-321
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mentoring Student Training, what Is Important?
Autorzy:
Raposo-Rivas, M.
Martinez-Figueira, E.
Powiązania:
https://bibliotekanauki.pl/articles/26182733.pdf
Data publikacji:
2013-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mentor
mentoring
student training
education
professional profile
professional competence
Opis:
Numerous activities and tasks are performed in the course of the tutorial during student training, but not all have the same importance for the tutor. We approach this answer through a wider investigation (Martinez, 2010) conducted in two phases: an initial qualitative one using an interview as a tool for obtaining information, and a second one more quantitative with an electronic questionnaire. The results show the importance that tutors attribute to “being available for students”, “integration into the center” and “providing contextual knowledge and access to documentation of the institution”.
Źródło:
The New Educational Review; 2013, 32; 243-254
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mentoring Student Training: What Do Mentors Do?
Autorzy:
Martínez-Figueira, E.
Raposo-Rivas, M.
Powiązania:
https://bibliotekanauki.pl/articles/2031772.pdf
Data publikacji:
2014-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mentor
mentoring
teaching practice
student learning
Opis:
In this paper we look into the role of mentors in student training given it is of paramount importance and at times both unknown and undefined. We studied this issue through research conducted in three Spanish universities using Creswell’s biphasic model along with sequential data triangulation. We obtained information by interviewing mentors and applying an electronic questionnaire. The results show that basically mentors are available for students in student training, facilitate their integration in the center. The study indicates that conceptualizing and operationalizing mentoring functions is difficult, however, they set up a reference for the development of student training.
Źródło:
The New Educational Review; 2014, 37; 188-201
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How inclusive education becomes a community project: a participatory study in the northwest of Spain
Autorzy:
Parrilla, A.
Martinez-Figueira, E.
Raposo-Rivas, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011468.pdf
Data publikacji:
2015-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
inclusive schools
education for all
participatory research
community-based research
collaborative inquiry
Opis:
This paper shows how a participatory study on inclusive education was designed and developed in a town in the northwest of Spain. The methodology included the development of collaborative inquiries at intra-school, interschool and local levels. It was designed by following the principles of participative and community-based research. This study demonstrates diverse ways in which different educational levels face inclusion; the value of collaboration between agents and institutions for innovative thinking and practice; and the need to develop further and wider research connecting participatory research and community engagement movements to systematic research into inclusive education.
Źródło:
The New Educational Review; 2015, 42; 177-188
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of convolutional neural networks using the fuzzy gravitational search algorithm
Autorzy:
Poma, Yutzil
Melin, Patricia
González, Claudia I.
Martínez, Gabriela E.
Powiązania:
https://bibliotekanauki.pl/articles/384794.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
neural networks
convolutional neural network
fuzzy gravitational search algorithm
deep learning
Opis:
This paper presents an approach to optimize a Convolutional Neural Network using the Fuzzy Gravitational Search Algorithm. The optimized parameters are the number of images per block that are used in the training phase, the number of filters and the filter size of the convolutional layer. The reason for optimizing these parameters is because they have a great impact on performance of the Convolutional Neural Networks. The neural network model presented in this work can be applied for any image recognition or classification applications; nevertheless, in this paper, the experiments are performed in the ORL and Cropped Yale databases. The results are compared with other neural networks, such as modular and monolithic neural networks. In addition, the experiments were performed manually, and the results were obtained (when the neural network is not optimized), and comparison was made with the optimized results to validate the advantage of using the Fuzzy Gravitational Search Algorithm.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 1; 109-120
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł

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