Relevant bibliographies by topics / Magnetism. Electromagnetism

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Magnetism. Electromagnetism'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Magnetism. Electromagnetism"

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Bezen, Sevim, Işıl Aykutlu, and Celal Bayrak. "An Examination of the Relationship between High School Students’ Self-efficacy Perceptions Concerning Electromagnetism and Their Academic Success." SHS Web of Conferences 48 (2018): 01049. http://dx.doi.org/10.1051/shsconf/20184801049.

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In the study, “Magnetism and Electromagnetic Induction” topic, which is part of the unit titled Electricity and Magnetism within the 11th grade Physics program that came into effect in 2013. In this study that aims to examine the relationship between high school students’ self-efficacy perceptions concerning electromagnetism and their academic success, study group consists of students who are enrolled at the 11th grade of Anatolian high schools in Ankara. Selection criterion was that students have completed covering “Magnetism and Electromagnetic Induction” topic. Within the scope of the study, answers to following questions were sought: “What is the self-efficacy level of 11th-grade students concerning electromagnetism?”, “What is the academic success levels of 11th grade students concerning electromagnetism?” and “Is there a meaningful relationship between students’ perception of self-efficacy concerning electromagnetism and their academic success?”. At the end of the study, it was revealed that students experience problems with electromagnetism, and thus they do not have a high perception of self-efficacy.
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Zhao, Guo Sheng, Zi Xia Cheng, Xiu Pang Wang, Dong Xue Li, Ke Yao, and Ke Qin Sun. "Simulation Research of Three-Phase Magnetic Controllable Reactor." Advanced Materials Research 538-541 (June 2012): 975–81. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.975.

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A kind of new type three-phase magnetism valve type controllable reactor is proposed in this article, its structure and the principle are introduced. The article carried the electromagnetism analysis on the new type magnetism valve type controllable reactor, and established the three-phase magnetism valve type controllable reactor two-dimensional simulation model with Ansoft electric-magnetic field analysis software. Simulation results verified the feasibility of adjusting the reactor reactance smoothly by adjusting the thyristor's triggering angle. Lastly, it made an analysis about three-phase magnetism valve type controllable reactor's electromagnetism field distribution.
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Chen, Ming Baio, Xiao Min Wang, Ri Ping Liu, Qing Xiang Yang, Wen Chang Liu, You Sheng Tao, Jun Yan, Xiao Yi Ma, Jian Li, and Pan Pan Zhai. "Methods and Equipment of Vacuum and Electromagnetism Suspending Distillation for Fine of Non-Ferrous Metals." Advanced Materials Research 295-297 (July 2011): 1150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1150.

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A kind of invention by make the technology excellence band together of vacuum distillation refines and Vacuum and electromagnetism refine. A kind of methods and equipment for fine of Non-ferrous metals, the unusual is: use the electromagnetism force and mix round effect of electro-magnetic induction for heat up and mix round and element distill process under electro-magnetism suspend state of Non-ferrous materials. A kind of equipment and equipment for fine of non-ferrous metals consist of vacuum furnace body, electro-magnetism loop, crucible, condenser and materials vacuum resent device, etc.; The main character is: the electro-magnetism loop is electro-magnetism conductor suspend loop which located the outside or inside the body of the furnace with a tier of insulation and magnetism transmit material. The aim of which is to develop the pureness of the product by electro-magnetism suspend vacuum distillation or deoxidize distillation and efficiency of smelting; reduce the cost of the smelting.
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Qadir, Asghar, and D. P. Mason. "Sesquicentennial of the presentation by James Clerk Maxwell of his paper "A Dynamical Theory of the Electromagnetic Field" to the Royal Society of London." International Journal of Modern Physics: Conference Series 38 (January 2015): 1560070. http://dx.doi.org/10.1142/s2010194515600708.

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James Clerk Maxwell is generally regarded as the greatest contributor to the development of Physics in the time between Newton and Einstein. His most important contributions are the Kinetic Theory of Gases and Electromagnetism which is the unified theory of Electricity and Magnetism. Although his major work on Electromagnetism was published in 1865 it was read at a meeting of the Royal Society of London in 1864. The sesquicentennial of the theory correctly falls in 2014. In this article that event is celebrated. Parts of his early and professional life are described. Aspects of his many contributions are discussed but mainly we concentrate on his contributions through thermal and electromagnetic Physics.
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JIMÉNEZ, JOSE BELTRÁN, and ANTONIO L. MAROTO. "THE DARK MAGNETISM OF THE UNIVERSE." Modern Physics Letters A 26, no. 40 (December 28, 2011): 3025–39. http://dx.doi.org/10.1142/s0217732311037315.

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Despite the success of Maxwell's electromagnetism in the description of the electromagnetic interactions on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that the problems of dark energy and the origin of cosmic magnetic fields could be pointing to a modification of Maxwell's theory on large scales. Here, we review such a proposal in which the scalar state which is usually eliminated by means of the Lorenz condition is allowed to propagate. On super-Hubble scales, the new mode is essentially given by the temporal component of the electromagnetic potential and contributes as an effective cosmological constant to the energy–momentum tensor. The new state can be generated from quantum fluctuations during inflation and it is shown that the predicted value for the cosmological constant agrees with observations, provided inflation took place at the electroweak scale. We also consider more general theories including non-minimal couplings to the spacetime curvature in the presence of the temporal electromagnetic background. We show that both in the minimal and non-minimal cases, the modified Maxwell's equations include new effective current terms which can generate magnetic fields from sub-galactic scales up to the present Hubble horizon. The corresponding amplitudes could be enough to seed a galactic dynamo or even to account for observations just by collapse and differential rotation in the protogalactic cloud.
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Rehn, J., and R. Moessner. "Maxwell electromagnetism as an emergent phenomenon in condensed matter." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2075 (August 28, 2016): 20160093. http://dx.doi.org/10.1098/rsta.2016.0093.

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The formulation of a complete theory of classical electromagnetism by Maxwell is one of the milestones of science. The capacity of many-body systems to provide emergent mini-universes with vacua quite distinct from the one we inhabit was only recognized much later. Here, we provide an account of how simple systems of localized spins manage to emulate Maxwell electromagnetism in their low-energy behaviour. They are much less constrained by symmetry considerations than the relativistically invariant electromagnetic vacuum, as their substrate provides a non-relativistic background with even translational invariance broken. They can exhibit rich behaviour not encountered in conventional electromagnetism. This includes the existence of magnetic monopole excitations arising from fractionalization of magnetic dipoles; as well as the capacity of disorder, by generating defects on the lattice scale, to produce novel physics, as exemplified by topological spin glassiness or random Coulomb magnetism. This article is part of the themed issue ‘Unifying physics and technology in light of Maxwell's equations’.
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Ciobanu, Robert, Maurizio Repetto, Octavian Dontu, Fabio Freschi, and Tudor Prisecaru. "Device Used for Magnetic Treatment of Fuel Fluids before Burner." Applied Mechanics and Materials 186 (June 2012): 214–18. http://dx.doi.org/10.4028/www.scientific.net/amm.186.214.

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Worldwide magnetism was considered a "stepchild" of electromagnetism, but lately this has changed, and scientists give it great importance today, making a series of studies in which it is the main "actor". Regarding the magnetostatic field, the appearance of magnets with high performance, has led the development of permanent magnet structures with different technical applications, which successfully replace electromagnets. In this paper our main objective was to design and test a device used for magnetic treatment of fuel fluid which flow through pipes before burner to improve combustion dynamics and decrease the released fumes.
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Nolan, Sam. "Electricity and Magnetism (3rd ed.) by E Purcell and D Morin." New Directions in the Teaching of Physical Sciences, no. 9 (February 12, 2016): 109. http://dx.doi.org/10.29311/ndtps.v0i9.507.

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This book is an excellent updated introduction to this classic 50 year old text for 1st and 2nd year undergraduate electromagnetism. Starting from the basic concept of electronic charge and building in neat sequential units, from electrostatics, through current and into magnetism, it provides an excellent introduction to Maxwell’s equations.
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Moored, Keith W. "Effect of conservation of spatial volume on electromagnetism." Physics Essays 34, no. 2 (June 27, 2021): 248–55. http://dx.doi.org/10.4006/0836-1398-34.2.248.

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This essay presents an alternate mechanism for electromagnetism and provides arguments supporting new concepts of this phenomenon. Electricity and magnetism are defined and influenced by the electric permittivity ε o and magnetic permeability μ o physical constants of the vacuum. This essay's concepts are predicated on the notion that the free-space vacuum appears to be composed of an energy field with characteristics of an elastic medium termed the “spatial energy field” or SEF. It is proposed that the geometric volume of the SEF requires conservation, and this is achieved via stretching or compression of space exhibiting wavelike qualities. The SEF, representing spacetime, has specific properties related to the emergence of an electrical field force via the Poynting vector. Magnetic field force appears to emanate from the SEF based on the Lorentz force. Space (SEF) appears to mediate energy fields, such as electrical and magnetic fields, and provides a framework for the transmission of electromagnetic waves in addition to momentum-gravitational waves. Conservation of spatial volume influences these phenomena.
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Overduin, James, Taylor Pettaway, Hannah Clark, and Mark Edmonston. "Rolling Railgun: A Lab Activity for Introductory Electromagnetism." Physics Educator 02, no. 04 (December 2020): 2050017. http://dx.doi.org/10.1142/s2661339520500171.

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We describe a laboratory exercise for an introductory calculus-based electricity and magnetism course in which students construct and study the performance of a “rolling railgun” formed by two small coin magnets connected by a ferromagnetic axle which carries current from one rail to the other. This exercise can be scaled up from a simple, mostly qualitative activity to a more comprehensive comparison between theory and experiment that will challenge students’ calculus skills. The required components are small and inexpensive enough to mail to students who are taking the course remotely. We report on our initial success in incorporating this lab into our curriculum at Towson University.
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Dissertations / Theses on the topic "Magnetism. Electromagnetism"

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Li, Zhou, of Western Sydney Nepean University, and of Mechatronic Computer and Electrical Engineering School. "Numerical computation of core losses in permanent magnet machines." THESIS_XXXX_MCEE_Li_Z.xml, 2000. http://handle.uws.edu.au:8081/1959.7/284.

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This thesis presents a study on core loss calculations in rotating electrical machines. The basic concepts concerning magnetic moments, ferromagnetism, magnetic domains and magnetic hysteresis are introduced. The three-term models for alternating and rotational core losses in electrical steel sheets are presented. Several core loss measurement techniques are reviewed and an experiment is carried out to measure the total core losses in an electrical sheet steel sample under alternating and rotational magnetic fields of various frequencies and amplitudes. The coefficients in the loss models for alternating and rotational core losses are obtained through curve fitting process. The theory of electromagnetic fields is presented through the Maxwell equations and field scalar equations. A detailed review on core loss models for rotating electrical machines is presented. A rotational core loss model is adopted to calculate the core losses in a PM motor. The total core loss in the PM motor is obtained by summing the element losses using a MATLAB program. An experiment is conducted to measure the total core loss in the PM motor. The calculated total core loss in the PM motor is compared with the experimental results. The calculated total core losses are about 19% lower than the tested results. Various possible causes for this discrepancy are discussed
Master of Engineering (Hons)
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Šindelář, Petr. "Návrh hybridního magnetického ložiska." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-443089.

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The thesis deals with the design of a hybrid magnetic bearing. This is an extension of the issue of common bearings in high-speed motors. The work is divided into three parts. A general theory of magnetic bearings is described in the first part. The second part deals with the mathematical description of the bearing. A proposal of specific hybrid magnetic bearing is described in the third part. The bearing for the motor was already designed. It is a 45000rpm motor with a power output of 12 kW. This thesis aims to create a design of hybrid magnetic bearing with magnets to create a permanent magnetic field and coils to regulate forces to stabilize the rotor and limit vibrations. The practical design includes mathematical calculation in Matlab and computer simulation based on the finite element method in ANSYS Maxwell.
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Silva, Leonardo de Sousa. "Efeitos de diluição química no composto intermetálico GdIn3." Pós-Graduação em Física, 2013. https://ri.ufs.br/handle/riufs/5294.

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This work proposes the development of a technique to growth of single crystals through metallic flux technique at the Sergipe State. Besides, the system YxGd1-xIn3 (0 x 0.5 to pass of 0.10 % ) has been obtained via this technique and its structural and magnetic properties are studied. X-ray diffraction results have been performed in order to verify if the desired crystalline phase was obtained. The experimental results show that it has been grown with success. The magnetic characterization is carried out through magnetic susceptibility data as function of temperature (2 x 300 K) and magnetic field (??7 H 7T). The T-dependence of the magnetization shows a suppression of the magnetic ordering temperature with increasing of the yttrium concentration. The analyses of these experimental data show that the system presents magnetic frustration which is linked to the dilution effect introduced by the yttrium ion in the gadolinium site. The magnetization data as function of magnetic field carried out at 2 K show a usual behavior of a material with antiferromagnetic ordering.
Este trabalho propôs a implementação da técnica de crescimento de monocristais via fluxo metálico, na Universidade Federal de Sergipe (UFS) campus de itabaiana. Além disso, o sistema YxGd1-xIn3 (0 < x < 0.5 a passo de 0.10 % ) foi obtido através dessa técnica e as propriedades estruturais e magnéticas foram estudadas. Medidas de difração de raios X foram realizadas com o intuito de verificar o crescimento da fase cristalina desejada. Os dados mostraram que ela foi obtida com sucesso. A caracterização magnética foi feita através de medidas de susceptibilidades magnética em função da temperatura (2 < x < 300 K) e do campo magnético (-7 < H < 7T). As medidas de magnetização em função da temperatura mostraram uma supressão da temperatura de ordenamento magnético com o aumento da concentração de ítrio. As análises desses dados mostraram que o sistema apresenta frustração magnética que está ligado ao efeito de diluição introduzido pelo íon de ítrio no sitio do gadolínio. As medidas de magnetização em função do campo magnético realizadas a 2 K mostraram um comportamento típico de um material com ordenamento antiferromagnético.
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Li, Zhou. "Numerical computation of core losses in permanent magnet machines /." View thesis, 2000. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030901.113715/index.html.

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Thesis (M.Sc (Hons)) -- University of Western Sydney, Nepean, 2000.
"Submitted for the degree of Master of Engineering (Hons), School of Mechatronic, Computer & Electrical Engineering, University of Western Sydney, Nepean" Includes bibliographical references (leaves 107-114).
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Parsa, Nitin. "MILLIMETER-WAVE FARADAY ROTATION FROM FERROMAGNETIC NANOWIRES AND MAGNETOELASTIC MATERIALS." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1561468969375731.

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Lukawska, Anna Beata. "THERMAL PROPERTIES OF MAGNETIC NANOPARTICLES IN EXTERNAL AC MAGNETIC FIELD." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401441820.

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Pires, Artur José dos Santos. "Uma proposta de sequência didática para tópicos de magnetismo e eletromagnetismo." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2315.

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Acompanha: Produto educacional: uma proposta de sequência didática para tópicos de magnetismo e eletromagnetismo
CAPES
O objetivo deste trabalho foi estudar a aplicação de uma sequência didática pautada na atividade experimental por meio de uma abordagem investigativa com uma turma da 4ª Série do Ensino Técnico Integrado em informática de nível Médio, com uma faixa etária entre 15 e 17 anos de uma instituição de ensino da rede pública federal da cidade de Campo Mourão/PR. A implementação da proposta e posteriormente análise dos dados atendeu os pressupostos da pesquisa qualitativa. Com esse trabalho, constatou-se que os alunos traziam suas explicações para o fenômeno físico estudado as quais careciam de respaldo técnico e científico e, a partir do trabalho em grupo durante a implementação da proposta, possibilita a estes uma visão mais científica e menos simplista do conceito estudado.
The objective of this work was to study the application of a didactic sequence based on the experimental activity by an investigative approach with a group of the 4th grade students of an Integrated Technical Course in Computer Science, at age between 15 and 17 years old of a federal institution in Campo Mourão city / PR. The implementation of the proposal and later analysis of the data met the assumptions of the qualitative research. With this work, it was verified that the students brought their explanations for the physical phenomenon studied, which needed technical and scientific support and, the group work, during the implementation of the proposal, allows them a more scientific and less simplistic view of the concept studied.
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Hartman, Gregory. "Monolithically integrated non-reciprocal devices based on magnetic thin films." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1369095798.

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Fernàndez, Martínez Antonio. "Estudi de Materials Magnètics amb Microones." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/145975.

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La resposta dels materials i/o sistemes físics quan interactuen amb la radiació electromagnètica ens dóna informació sobre les propietats físiques d’aquesta classe de materials i/o sistemes, com per exemple la conductivitat elèctrica, la permeabilitat magnètica, l’isospín d’un nucli atòmic, etc. Dos exemples són les ressonàncies magnètiques nuclear i electrònica, que consisteixen en sotmetre un material a radiació electromagnètica en el rang de radiofreqüència i microones, freqüències entre el 10 MHz i 300 GHz, i a un camp magnètic estacionari. En aquesta tesi es presenten els comportaments i/o la resposta de dos materials magnètics en front a la radiació de microones, el qual pertany al rang de freqüències compres entre els 300 MHz i els 300 GHz. Per aquest propòsit, el Grup de Magnetisme, Superconductivitat, Microones i Baixes temperatures de la Universitat de Barcelona, disposa d’un analitzador de xarxes vectorial model E8361A de la companyia Agilent, que permet analitzar senyals electromagnètiques, transmeses i/o reflectides, entre 10 MHz i 110 GHz. Les dues classes de materials magnètics que s’han estudiat son: el granat d’itri-ferro, amb composició química corresponent Y3Fe5O12 (YIG) i la manganita de lantà i calci, amb composició química corresponent La0.25Ca0.75MnO3. En el cas del YIG, encara que és un material magnètic força estudiat, ens vàrem plantejar el seu estudi emprant nous dissenys de ressonadors de microones. Aquest fet, junt amb l’aparició de nous resultats experimentals inesperats, i mancats d’una interpretació, justifiquen el seu estudi en aquesta memòria de tesis. En el cas de la manganita, ens trobàrem en la situació oposada, no hi ha gaires publicacions sobre mesures experimentals de ressonància electrònica de espín en aquest tipus de materials. Juntament amb l’aparició de nous fenòmens magnètics no publicats, quan es va procedir a la seva sistemàtica i completa caracterització magnètica. Fets que justifiquen el seu estudi en aquesta memòria de tesis. Aquesta memòria de tesis està organitzada en dos capítols: El primer capítol està dedicat al granat de d’itri-ferro, material ferrimagnètic a temperatura ambient (la seva temperatura de Curie és de 550 K), i que té les pèrdues d’energia més petites de tots els materials coneguts, quan aquest està sotmès a una senyal electromagnètica de microones. Llavors, aquest material és el més indicat per a l’estudi del fenòmens associats a la ressonància ferromagnètica. Per tant, en aquest capítol es presenta una introducció a la tècnica i a la fenomenologia física associada a la ressonància magnètica; una descripció de les propietats físiques del granat d’itri-ferro i una introducció a l’electrònica de microones. Aquesta última servirà com fonament per comprendre els experiments de ressonància ferromagnètica a temperatura ambient; ja que en ells s’empren tres tipus de ressonadors de microones: dos ressonadors de línia de microtira lambda/2 i un tercer consistent en dos ressonadors lambda/2 de microtira acoblats electrònicament entre ells en els seus centres (en forma de X). Juntament amb l’analizador de xarxes vectorial i un electromagnet, que pot aplicar camps magnètics fins a 0.5 T. La mostra de YIG ha estat crescuda epitaxialment en les dues cares d’un disc de granat de gadolini-gal.li (Gd3Ga5O12). El conjunt té un gruix de 0.5 mm i un diàmetre de 4 mm; les dues capes de YIG tenen un gruix de 49.6 milimicres cadascuna. Els resultats experimentals ens mostren tres espectres de absorció associats a tres classes de modes magnetoestàtics, com conseqüència de tres tipus de distribucions espacials de camp magnètic de microones, que sent el disc de YIG. Observats a quatre freqüències de ressonància diferents. I no únicament a una freqüència fixada, sinó en el rang de freqüències que defineixen cada pic de ressonància de cada ressonador. Els resultats d’aquesta última classe d’experiments mostren una correspondència lineal entre la freqüència de microones i el camp magnètic aplicat, però no correspon amb la relació obtinguda a través de la teoria dels modes magnetoestàtics. Es van realitzar estimacions per descartar qualsevol efecte de potència o acoblament entre les dues capes de YIG, portant a l’única explicació possible que aquests modes magnetoestàtics estan interaccionant amb la radiació electromagnètica que ells mateixos generen en la mostra de YIG. Arrel d’això, s’ha ideat un model basat en aquesta conclusió, per explicar com canvien les relacions lineals entre la freqüència de microones i el camp magnètic aplicat, en presència de radiació electromagnètica. Model que explica satisfactòriament els resultats obtinguts en les mesures experimentals de ressonància ferromagnètica en YIG. El segon capítol està dedicat a l’estudi de la manganita La0.25Ca0.75MnO3 des del punt de vista magnètic i de la ressonància electrònica d’espín. Per això, en aquest capítol se realitza una introducció a la família de manganites La(1-x)CaxMnO3 , atenent a la seva fenomenologia magnètica. Degut a això, també es descriu el fenomen del esbiaix d’intercanvi i la dinàmica de sistemes superparamagnètics i de vidres de espín. Aquests seran els fonaments per entendre els resultats de la caracterització magnètica de dues manganites nanogranulars, que anomenarem A i B; les quals fóren fabricades pel mètode sol-gel y calcinades a 600ºC i a 1000ºC respectivament. Per poder realitzar aquestes mesures experimentals, es disposa d’un magnetòmetre MPMS que permet realitzar mesures de magnetització entre 2 K y 350 K, aplicant camps magnètics entre -5 T i 5 T, a més de realitzar mesures de susceptibilitat magnètica a diferents freqüències de camp magnètic altern entre 0.1 Hz i 1500 Hz. Els resultats obtinguts mostren que els nanogrànuls contenen, des del punt de vista magnètic, un nucli antiferromagnètic i una escorça formada per clústers ferromagnètics, que interactuen a través de l’interacció de intercanvi. A més, en la mostra B s’observa el fenomen de l’ordenament de càrrega a altes temperatures i la manifestació d’un vidre d’espín interficial a baixes temperatures, entre els clústers ferromagnètics i el nucli antiferromagnètic. Fets molt poc habituals en aquest tipus de mostres i que no es donen en la mostra A. Finalment, en les mesures de ressonància electrònica d’espín, es van emprar dues classes de ressonadors de microones: un ressonador coaxial i un ressonador de microtira curtcircuitat i alhora connectat en sèrie a una resistència de 50 Ohms, específica per senyals de radiofreqüència i microones. Amb ells, els resultats experimentals obtinguts per a la mostra A concorden amb el model hidrodinàmic per als vidres d’espín. Fet que permet estimar la dependència de la constant giromagnètica i la constant d’anisotropia uniaxial efectiva de la mostra A, amb la temperatura. La correlació entre l’anisotropia magnètica uniaxial efectiva i la temperatura concorda amb la corresponent als vidres d’espín i/o les nanopartícules magnètiques i a més, permet l’estimació de la seva temperatura d’ ordenament de càrrega, essent aproximadament de 225 K . El factor giromagnètic de la mostra A reflecteix un canvi de la seva estructura cristal.lina, associada als clústers ferromagnètics, mentre va variant la temperatura. Fet que es presenta com una alternativa a l’hora d’estudiar canvis estructurals en els cristalls.
In this doctoral thesis, the response against the microwave electromagnetic radiation of two well differentiated magnetic materials is studied: the yttrium-iron garnet and the nanogranular manganite of chemical composition La0.25Ca0.75MnO3. In the case of the yttrium-iron garnet (YIG), even though it is a well-known magnetic material, we considered its study using a new sort of microwave resonators. This fact, together with the obtaining of unexpected experimental results without physical interpretation, inspires its study in this thesis. In the case of the manganite, we had found the opposite situation, in the literature experimental studies in electron spin resonance (ESR) have hardly ever been reported in this kind of materials. Therefore, we decided to perform its study using different microwave resonators. It was necessary, as well, to characterize magnetically the samples to understand their behavior. Precisely in these last experimental measurements, performed following a complete and systematic procedure, we were able to explain new physical phenomenology never reported previously, until now, in this material. This doctoral thesis, entitled “Study of Magnetic Materials with Microwaves” is arranged in two chapters. The first one is devoted to the study of the ferromagnetic resonance in a disk-shaped YIG sample. The results show the appearance of three types of Magnetostatic Spin Forward Volume Waves (MSFVW), for three kinds of microstrip resonators (two linear ones and one X-shaped), related with three kinds of magnetic spatial distributions. The relationship between the microwave frequency and the applied magnetic field does not follow the theoretical model of MSFVW and, after some estimations, we concluded that this is caused by the interaction between the MSFVW and the electromagnetic radiation generated by them. This new fact is explained theoretically by the development of a new model, considering this last interaction. The second chapter is devoted to the study of nanogranular manganites of chemical composition La0.25Ca0.75MnO3, from the point of view of their magnetism and their ESR response. A complete and systematic magnetic characterization is performed firstly in two samples, named A and B. Both samples manifest exchange bias interaction between ferromagnetic shell clusters and antiferromagnetic core, in each nanograin. Moreover, in sample B, interficial spin-glass is observed at low temperatures and charge ordering transition at high temperatures. These facts are rarely reported in similar magnetic systems. And they are not observed in sample A. ESR experiments were performed in sample A with a coaxial resonator and a short-circuited microstrip resonator connected to a 50 Ohms series resistor. The results follow the hydrodynamic model, allowing the estimation of the effective magnetic anisotropy constant and the gyromagnetic factor at different temperatures. The first one shows the same thermal behavior expected for nanoparticles and/or spin-glasses, and it also allows the estimation of the charge ordering temperature of sample A around 225 K. The thermal dependence of the gyromagnetic factor shows the expected behaviour for the crystalline structure of a La0.25Ca0.75MnO3 nanoparticle system. This means that the calculation of the thermal behavior of gyromagnetic factor is an alternative to X-ray thermal studies.
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Kadlecová, Lucie. "Elektromagnetické výkonové aktuátory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377004.

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This master thesis focuses on literature research of problematics linked to power actuators working on electromagnetic principle to accelerate metal projectiles. It’s goal is mathematical analysis and constuction of selected type of electromagntic power actuator – induction coilgun
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Books on the topic "Magnetism. Electromagnetism"

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), Bellingham School District No 501 (Wash. Magnetism, electromagnetism, electricity. Bellingham, Wash: The Schools, 1989.

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A, Selen Mats, and Stelzer Tim, eds. Electricity and magnetism. New York: W.H. Freeman, 2012.

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A, Greenwood D., ed. Electricity and magnetism. Cambridge: Cambridge University Press, 1991.

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Classical theory of electricity and magnetism: A course of lectures. Calcutta: Oxford University Press, 1990.

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K, Brussel Morton, ed. Electricity and magnetism. New York: Wiley, 1985.

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Grant, I. S. Electromagnetism. 2nd ed. Chichester [England]: Wiley, 1990.

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Jefimenko, Oleg D. Electricity and magnetism: An introduction to the theory of electric and magnetic fields. 2nd ed. Star City, W. Va: Electret Scientific Co., 1989.

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1938-, Olsson Martin G., ed. Classical electricity and magnetism: A contemporary perspective. Boston: Allyn and Bacon, 1987.

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Waves: Principles of light, electricity, and magnetism. Minneapolis: Lerner Publications Co., 2002.

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service), SpringerLink (Online, ed. The Classical Theory of Fields: Electromagnetism. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Book chapters on the topic "Magnetism. Electromagnetism"

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Dobbs, E. R. "Magnetism." In Basic Electromagnetism, 79–101. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2112-5_6.

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Warnes, L. A. A. "Magnetism and electromagnetism." In Electronic and Electrical Engineering, 227–38. London: Macmillan Education UK, 1994. http://dx.doi.org/10.1007/978-1-349-13012-2_12.

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Keighley, John, and Stephen Doyle. "Magnetism and Electromagnetism." In Physics GCSE, 163–77. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-14325-2_14.

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Warnes, Lionel. "Magnetism and electromagnetism." In Electronic and Electrical Engineering, 249–60. London: Macmillan Education UK, 2003. http://dx.doi.org/10.1007/978-0-230-21633-4_13.

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Warnes, Lionel. "Magnetism and electromagnetism." In Electronic and Electrical Engineering, 243–54. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-15052-6_13.

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Keighley, H. J. P. "Magnetism, Electromagnetism, Motors, Dynamos and Transformers." In Work Out Physics GCSE, 154–74. London: Macmillan Education UK, 1987. http://dx.doi.org/10.1007/978-1-349-09448-6_12.

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Keighley, H. J. P. "Magnetism, Electromagnetism, Motors, Dynamos, Transformers and Cells." In Work Out Physics ‘O’ Level and GCSE, 183–204. London: Macmillan Education UK, 1986. http://dx.doi.org/10.1007/978-1-349-07213-2_14.

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Matsushita, Teruo. "Electromagnetic Induction." In Electricity and Magnetism, 231–53. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54526-2_10.

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Matsushita, Teruo. "Electromagnetic Wave." In Electricity and Magnetism, 271–90. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54526-2_12.

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Matsushita, Teruo. "Electromagnetic Wave." In Electricity and Magnetism, 339–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82150-0_12.

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Conference papers on the topic "Magnetism. Electromagnetism"

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"Committees: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICE-R3M) 2019." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/12.0001077.

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"Preface: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICE-R3M) 2019." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/12.0000688.

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Machado, J. A. Tenreiro, Isabel S. Jesus, and Alexandra Galhano. "A Fractional Calculus Perspective in Electromagnetics." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84862.

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Some experimentation with magnets was beginning in the late 19th century. By then reliable batteries had been developed and the electric current was recognized as a stream of charge particles. Maxwell developed a set of equations expressing the basic laws of electricity and magnetism, and demonstrated that these two phenomena are complementary aspects of electromagnetism. He showed that electric and magnetic fields travel through space, in the form of waves, at a constant velocity. Maxwell is generally regarded as the nineteenth century scientist who had the greatest influence on twentieth century physics, making contributions to the fundamental models of nature. Bearing these ideas in mind, in this study we apply the concept of fractional calculus and some aspects of electromagnetism, to the static electric potential, and we develop a new fractional order approximation method to the electrical potential.
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"Photographs of ICE-R3M 2019: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICE-R3M) 2019." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/12.0001078.

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Agustine, Eleonora, Dini Fitriani, Kartika H. Kirana, Fatah Ramdhan, and Wahyu Srigutomo. "Analysis of changes in soil physical properties using electrical method as an indicator of pollution distribution in North Jakarta." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017183.

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Nasikhudin, Markus Diantoro, Ahmad Kusumaatmaja, and Kuwat Triyana. "Enhancing photocatalytic performance by sonication and surfactant addition on the synthesis process of PVA/TiO2 nanofibers membranes by electrospinning method." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017654.

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Santoso, Nono Agus, Rendra Aditya Hakim, Reza Rizki, Wijayanti Ashuri, Andri Yadi Paembonan, and Siti Zulaikah. "Geothermal studies to identify the flow of hot water in Natar, Lampung using gradiometer." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015796.

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Muztaza, Nordiana Mohd, Rosli Saad, Mokhtar Saidin, and Kiu Yap Chong. "Magnetic signal approach to the interpretation of meteorite impact crater at Bukit Bunuh." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015801.

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Hirt, Ann M. "Magnetic methods applied to the material, life, and environmental sciences." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015817.

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Luthfiyah, Ishmah, Markus Diantoro, Ulwiyatus Sa'adah, Siti Wihdatul Himmah, Hari Wisodo, Zainul Arifin Imam Supardi, and Arif Hidayat. "Magnetic driven electrical conductivity and band gap energy of SrTi1-XCrxO3." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015818.

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Reports on the topic "Magnetism. Electromagnetism"

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Thornell, Travis, Charles Weiss, Sarah Williams, Jennifer Jefcoat, Zackery McClelland, Todd Rushing, and Robert Moser. Magnetorheological composite materials (MRCMs) for instant and adaptable structural control. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38721.

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Magnetic responsive materials can be used in a variety of applications. For structural applications, the ability to create tunable moduli from relatively soft materials with applied electromagnetic stimuli can be advantageous for light-weight protection. This study investigated magnetorheological composite materials involving carbonyl iron particles (CIP) embedded into two different systems. The first material system was a model cementitious system of CIP and kaolinite clay dispersed in mineral oil. The magnetorheological behaviors were investigated by using parallel plates with an attached magnetic accessory to evaluate deformations up to 1 T. The yield stress of these slurries was measured by using rotational and oscillatory experiments and was found to be controllable based on CIP loading and magnetic field strength with yield stresses ranging from 10 to 104 Pa. The second material system utilized a polystyrene-butadiene rubber solvent-cast films with CIP embedded. The flexible matrix can stiffen and become rigid when an external field is applied. For CIP loadings of 8% and 17% vol %, the storage modulus response for each loading stiffened by 22% and 74%, respectively.
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Griffin, Stephen M., and L. L. Helms. Sub-Audio Magnetics: Miniature Sensor Technology for Simultaneous Magnetic and Electromagnetic Detection of UXO. Fort Belvoir, VA: Defense Technical Information Center, July 2010. http://dx.doi.org/10.21236/ada578948.

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Hadjipanayis, George C. Magnetic Meta-Materials for Electromagnetic Applications. Fort Belvoir, VA: Defense Technical Information Center, June 2006. http://dx.doi.org/10.21236/ada458377.

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Burns, L. E., G. R. C. Graham, J. D. Barefoot, Rebecca-Ellen Woods, and R. A. Pritchard. Chulitna electromagnetic and magnetic airborne geophysical survey. Alaska Division of Geological & Geophysical Surveys, March 2020. http://dx.doi.org/10.14509/30416.

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Vahala, L., G. Vahala, and N. Bretz. Electromagnetic wave scattering from magnetic fluctuations in tokamaks. Office of Scientific and Technical Information (OSTI), July 1991. http://dx.doi.org/10.2172/5499858.

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Emond, A. M., L. E. Burns, and G. R. C. Graham. Tonsina electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, January 2015. http://dx.doi.org/10.14509/29169.

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Emond, A. M., L. E. Burns, and G. R. C. Graham. Tok electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, 2015. http://dx.doi.org/10.14509/29347.

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Emond, A. M., L. M. Little, G. R. C. Graham, and B. J. Minsley. Airborne electromagnetic and magnetic survey, Yukon Crossing, interior Alaska. Alaska Division of Geological & Geophysical Surveys, December 2018. http://dx.doi.org/10.14509/29682.

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Burns, L. E., G. R. C. Graham, and J. D. Barefoot. Liscum electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, November 2019. http://dx.doi.org/10.14509/29755.

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Burns, L. E., J. D. Barefoot, and T. J. Naibert. Goodpaster electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, March 2019. http://dx.doi.org/10.14509/29813.

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