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657 results on '"López-López M"'

1. One-loop vertex correction in a plane wave

Author

Di Piazza, A. and Lopez-Lopez, M. A.

Subjects
High Energy Physics - Phenomenology
Abstract

We compute the general expression of the one-loop vertex correction in an arbitrary plane-wave background field for the case of two on-shell external electrons and an off-shell external photon. The properties of the vertex corrections under gauge transformations of the plane-wave background field and of the radiation field are studied. Concerning the divergences of the vertex correction, the infrared one is cured by assigning a finite mass to the photon, whereas the ultraviolet one is shown to be renormalized exactly as in vacuum. Finally, the corresponding expression of the vertex correction within the locally-constant crossed field is also derived and the high-field asymptotic is shown to scale according to the Ritus-Narozhny conjecture., Comment: 42 pages, 5 figures

Published
2020
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2. Interculturality and Teacher Education. A Study from Pre-Service Teachers' Perspective

Author

Hinojosa Pareja, Eva F. and López López, M. Carmen

Abstract

Due to the multicultural nature of society and the failure of some of the educational models adopted to respond to cultural diversity, there is a need to pay greater attention to teachers' training. This study examines Teacher Education students' beliefs about cultural diversity and their relationship with pre-service teacher training as key aspects in designing intercultural teacher training proposals and improving educational practice. This quantitative, descriptive study was carried out with 1464 participants enrolled in teacher training programs. The results show that future teachers have positive beliefs about cultural diversity in general terms, but their positions diverge when dealing with specific aspects and transferring them to professional practice. These beliefs vary depending on the year group, with students who are finishing their training process having more intercultural beliefs.

Published
2018

7. Construction and validation of Leading Inclusive Education in Compulsory Education Questionnaire (LIE-Q-Teaching Team).

Author

López-López, M. Carmen, León-Guerrero, M. José, and Hinojosa-Pareja, Eva F.

Subjects
*TEACHER development, *EDUCATIONAL leadership, *TEACHERS, *SCHOOL administration, *PSYCHOMETRICS
Abstract

The objective of this work is to create, and validate, a questionnaire aimed at assessing those actions undertaken by school management teams to promote inclusion in compulsory education sector in Spain. It is based on the perspective of teaching teams (members of management teams and teachers). To determine the psychometric properties of the questionnaire a descriptive, exploratory factorial and confirmatory factorial analysis was performed. In the pilot phase of the instrument, 243 members of teaching teams participated. The results obtained confirm that it is a valid and reliable scale with a bifactorial structure. The first of these factors includes actions carried out by the management teams to energise inclusive culture in their schools and thus turn them into inclusive communities. The other set of actions includes interventions with the aim of improving the training of students and creating professional learning communities. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Characterization of n-GaN / p-GaAs NP heterojunctions

Author

Hernández-Gutiérrez, C.A., Casallas-Moreno, Y.L., Cardona, Dagoberto, Kudriavtsev, Yu, Santana-Rodríguez, G., Mendoza-Pérez, R., Contreras-Puente, G., Mendez-Garcia, V.H., Gallardo-Hernández, S., Quevedo-Lopez, M.A., and López-López, M.

Published
2019
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19. Construction and Validation of a Questionnaire to Study Future Teachers' Beliefs about Cultural Diversity

Author

López López, M. Carmen and Hinojosa Pareja, Eva F.

Abstract

The article presents the construction and validation process of a questionnaire designed to study student teachers' beliefs about cultural diversity. The study, beyond highlighting the complexity involved in the study of beliefs, emphasises their relevance in implementing inclusive educational processes that guarantee the right to a good education for all. The questionnaire was administered to 1464 students from the different Teacher Education specialties. The results show that the instrument has a satisfactory internal consistency and is structured in seven components that largely correspond to the theoretical proposals used as the basis for constructing the questionnaire. The actions and analyses performed in the process of elaborating this inventory represent an advance compared to other similar studies in this line of research. From a methodological point of view, they provide detailed information about the questionnaire's psychometric characteristics, reliability and validity, with particular emphasis on the empirical data stemming from its application. From a conceptual point of view, the study incorporates beliefs related to different theoretical models of attention to cultural diversity, as well as their possible practical derivations at different levels of specificity.

Published
2016
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28. Optical studies of nitrogen plasma for molecular beam epitaxy of InN.

Author

Pérez-Caro, M., Ramírez-López, M., Hernández-Méndez, S., Rodríguez, B. A. G., Casallas-Moreno, Y. L., Gallardo-Hernández, S., and López-López, M.

Subjects
REFLECTION high energy electron diffraction, NITROGEN plasmas, MOLECULAR beam epitaxy, REACTIVE nitrogen species
Abstract

We report on the optical characterization of a nitrogen plasma source based on radiofrequency (RF) used to grow III-nitride materials by molecular beam epitaxy (MBE). Optical emission spectroscopy (OES) was used to study the nitrogen plasma response as a function of the RF power applied and the flow rate of molecular nitrogen. Analysis of the intensities of spectral signals assigned to atomic and molecular species and the ratio of these intensities is performed in detail. The OES results show that the plasma source studied is sensitive to the RF power applied to produce an atomic nitrogen signal, while varying the incoming flow impacts the signal of metastable nitrogen molecules; this outcome allows for the determination of conditions under which certain types of nitrogen species are favored over others. InN films were grown on AlN-buffered Si(111) substrates by MBE under different plasma operational parameters, where, according to the OES studies, atomic nitrogen or excited molecular nitrogen is favored in the plasma. In situ reflection high-energy electron diffraction, scanning electron microscopy, and x-ray diffraction techniques were employed to characterize the InN samples. It is found that the surface morphology of the InN films is highly sensitive to the plasma conditions. A transition in the growth mode from smooth compact films to coalesced islands and columnar structures is observed when the dominant reactive species is atomic nitrogen or excited molecular nitrogen. The results of the characterization are discussed and correlated with the reactive nitrogen species present in the plasma. [ABSTRACT FROM AUTHOR]

Published
2020
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29. Interference and electro-optical effects in cubic GaN/GaAs heterostructures prepared by molecular beam epitaxy.

Author

Zendejas-Leal, B. E., Casallas-Moreno, Y. L., Yee-Rendon, C. M., González-Pedreros, G. I., Santoyo-Salazar, J., Aguilar-Hernández, J. R., Vázquez-López, C., Gallardo-Hernández, S., Huerta-Ruelas, J., and López-López, M.

Subjects
MOLECULAR beam epitaxy, ELECTRO-optical effects, AUDITING standards, THERMO-optical effects, HETEROSTRUCTURES, OPTICAL interference
Abstract

Cubic GaN (c-GaN) samples on GaAs (0 0 1) substrates were grown by RF-plasma-assisted molecular beam epitaxy, in which an As4 overpressure was employed for the nucleating layer. Photoreflectance spectra were obtained in the temperature range from 14 to 300 K. Two independent phenomena were noticed. The first one consisted in optical interference features below the c-GaN bandgap, whose origin is a thermo-optical effect: the ultraviolet perturbation beam changes the refractive index of the c-GaN. The second one represents electro-optical phenomena in which two classical band-to-band transitions occur: the first transition for c-GaN layer in which the temperature dependence reveals defects in the film attributed to a hexagonal fraction estimated previously between 3% and 10%, and a second transition for the GaAs substrate that shows Franz–Keldysh oscillations. [ABSTRACT FROM AUTHOR]

Published
2020
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48. The Professional Profile of Teachers Working with Roma Students based on their Perceptions of Cultural Diversity. A Study in Compulsory Education

Author

López-López, M. Carmen, Rodríguez-Sabiote, Clemente, La Malfa, Stefania, López-López, M. Carmen, Rodríguez-Sabiote, Clemente, and La Malfa, Stefania

Abstract

Encouraging inclusive and intercultural education has become one of the key objectives for a number of international organisations and educational systems. However, moving towards this goal is impossible without the collaboration of teachers as their perceptions influence the way they organise and carry out their professional activities. The aim of this paper is to define the professional profile of compulsory education teachers working with Roma students in the Italian city of Messina. It is based on a study of their perceptions of cultural diversity and involves 182 teachers responsible for teaching students in the first cycle of compulsory education (6-14 year olds). A quantitative design using descriptive statistics resulted in the identification of two types of teacher profile, one with positions favourable to cultural diversity and the other with views and practices not favourable to it.

Published
2021

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