Results 51 to 60 of about 31,139 (274)

Dificultades de aprendizaje de los estudiantes universitarios en la teoría del campo magnético y elección de los objetivos de enseñanza [PDF]

, 2003
El objetivo principal de este trabajo es analizar las ideas que tienen los estudiantes sobre cuál es la naturaleza del campo magnético. Hemos supuesto que el conocimiento significativo de la fuente del campo magnético es un prerrequisito básico para que ...
Almudí García, José Manuel, Guisasola Aranzabal, Jenaro, Zubimendi Herranz, José Luis   +2 more
core   +2 more sources

Impacto de rehabilitación física y sistema súper inductivo generando magnetismo en fractura postquirúrgica de tobillo: Reporte de caso

Revista Científica, 2022
Las fracturas pueden producir impotencia funcional, deformidad, hematoma, entumecimiento, dolor y cosquilleo. Muchas requieren cirugía y rehabilitación física por personal calificado y equipos adecuados.
David Alfonso Cabrera Vásconez, Carlos Ignacio Cisneros Boada, Christian Andrés Benavides Vásconez, Gabriel Patricio Benavides Vásconez, Eliana Belén Jiménez Meza, Emma Lucila Vásconez Pazmiño   +5 more
semanticscholar   +1 more source

Decomposition of the Methylene Blue Dye Using Layered Manganese Oxide Materials Synthesized by Solid State Reactions

International Journal of Chemical Engineering, Volume 2018, Issue 1, 2018., 2018
The modulation in the synthesis parameters of layered manganese oxides allowed us to produce materials with different AC conductivities. These conductivities were correlated with the catalytic performance of the materials in the decomposition of methylene blue, as a model of electron transfer reactions.
M. E. Becerra, A. M. Suarez, N. P. Arias, O. Giraldo, Donald L. Feke   +4 more
wiley   +1 more source

Synthesis of FeNi Alloy Nanomaterials by Proteic Sol‐Gel Method: Crystallographic, Morphological, and Magnetic Properties

Journal of Nanomaterials, Volume 2016, Issue 1, 2016., 2016
Proteic Sol‐Gel method was used for the synthesis of FeNi alloy at different temperature conditions and flow reduction. The solids were characterized by XRD, H2‐TPR, SEM, TEM, Mössbauer spectroscopy, and VSM. It was observed by X‐ray diffraction pure FeNi alloy in the samples reduced at 600°C (40 mL/min H2 flow) and 700°C (25 mL/min H2 flow).
Cássio Morilla dos Santos, Adanny Filipe Nogueira Martins, Bruna Carolina Costa, Thiago Soares Ribeiro, Tiago Pinheiro Braga, João Maria Soares, José Marcos Sasaki, Edward A. Payzant   +7 more
wiley   +1 more source

Magnetic relaxation and magnetization field dependence measurements in La0.5Ca0.5MnO3

, 2000
We reported a systematic change in the average magnetic relaxation rate, after the application and removal of a 5 T magnetic field, in a polycrystalline sample of La0.5Ca0.5MnO3. Magnetic relaxation measurements and magnetization versus field curves were
F.M Araujo-Moreira, Huang, J López, Labarta, Moritomo, Mydosh, P.N Lisboa-Filho, Roy, W.A Ortiz, W.A.C Passos, Xiao   +10 more
core   +3 more sources

La aguja de Hans Christian Ørsted

Epistemología e Historia de la Ciencia, 2022
El presente escrito da un panorama acerca de la electricidad y el magnetismo al terminar el siglo XVIII y al iniciar el siglo XIX, contexto en el cual, se tiene la invención de la pila de Alessandro Volta, y el desarrollo de la experiencia de la aguja ...
Rodrigo Andrés Bautista Rincón
doaj   +2 more sources

Influence of Nanocrystalline Structure on the Magnetic Properties of Wires and Microwires

Texture, Stress, and Microstructure, Volume 32, Issue 1-4, Page 245-267, 1999., 1997
The determining factors of the outstanding magnetic properties of the so‐called nanocrystalline materials are described. The discussion is based on results performed on wires and microwire materials with general composition FeSiB(CuNb) and obtained by different rapid solidification techniques.
M. Vázquez, P. Marin, J. Arcas, A. Hernando, A. P. Zhukov, J. González   +5 more
wiley   +1 more source

Superconductividad y magnetismo. Nociones básicas y aplicaciones

Ciencia Digital, 2022
Introducción. El acelerado desarrollo alcanzado en la sociedad ha dado lugar a la incesante búsqueda de recursos factibles para evitar la contaminación ambiental, resulta que los materiales superconductores pueden ser precisos en la causa.
Isbel Garcés Ramírez, Tomás Espinoza Achong, Thalía Pérez Ramos, Efraín Velasteguí López   +3 more
semanticscholar   +1 more source

Influence of Various Heat Treatments on Giant Magnetoimpedance Effect in Nanocrystalline FeSiBNbCu Ribbons

Texture, Stress, and Microstructure, Volume 32, Issue 1-4, Page 269-279, 1999., 1997
In this paper we present studies on the frequency dependence of the magneto‐impedance in the range of 0.1–2 MHz for Fe73.5Si13.5B9Nb3Cu1 and Fe73.5Si16.5B6Nb3Cu1 nanocrystalline ribbons, which differ in the sign of the magnetostriction constant. As cast samples were annealed in Ar atmosphere at 560℃, with and without an DC and AC magnetic field.
G. V. Kurlyandskaya, M. Vázquez, E. H.C.P. Sinnecker, A. P. Zhukov, J. P. Sinnecker, A. Hernando, M. El Ghannami   +6 more
wiley   +1 more source

Sobre a condenação do magnetismo animal: revisitando a história da psicologia

Psicologia: Teoria e Pesquisa
O presente trabalho procura desenvolver uma reflexão crítica sobre o processo de condenação do magnetismo animal. Partindo de uma crítica às versões lineares e progressistas da história da Psicologia, nas quais o magnetismo é excluído ou pouco explorado,
Maurício da Silva Neubern
doaj   +1 more source