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Artículos de revistas sobre el tema "Magnetisk resonans"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

SARGSYAN, A., G. HAKHUMYAN, R. MIRZOYAN, A. PAPOYAN, D. SARKISYAN, C. LEROY y Y. PASHAYAN-LEROY. "SELECTIVE AMPLIFICATION OF NARROW RESONANCE FORMED IN TRANSMISSION SPECTRUM OF Rb NANO-CELL IN MAGNETIC FIELD". International Journal of Modern Physics: Conference Series 15 (enero de 2012): 9–15. http://dx.doi.org/10.1142/s2010194512006897.

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Recently it was shown that "λ-Zeeman Technique" (λ-ZT) is a convenient tool to study individual transitions between the Zeeman sublevels of hyperfine levels in an external magnetic field. λ-ZT is based on resonant transmission spectrum of nanometric thin cell (NTC) of thickness L = λ, where λ is the resonant wavelength 794 nm for Rb D1 line. Narrow velocity selective optical pumping (VSOP) resonances in the transmission spectrum of the NTC are split into several components in a magnetic field. Examination of VSOP resonances allows one to identify and investigate an atomic transition in the range of magnetic fields 10 - 5000 G. Here we present a new method for selective addressing of VSOP resonance amplification (more than 10 times).

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2

Карпунин, В. В. y В. А. Маргулис. "Резонансное поглощение электромагнитного излучения в монослое фосфорена". Журнал технической физики 53, n.º 4 (2019): 474. http://dx.doi.org/10.21883/ftp.2019.04.47443.8944.

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AbstractThe absorption coefficient of the electromagnetic radiation in a phosphorene single layer placed in a magnetic field is found. A degenerate and nondegenerate electron gas is considered. The resonant dependences of the absorptance on the radiation frequency and applied magnetic field are found. Taking into account electron scattering at an ionized impurity leads to oscillation dependences of the absorption coefficient on the radiation frequency and external magnetic field. The resonance character of the absorption curve is shown. The conditions of resonances and position of resonance peaks are found.

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3

Шварцбург, А. Б., Л. М. Василяк, С. П. Ветчинин, К. В. Алыбин, О. Д. Вольпян, Ю. А. Обод, В. Я. Печеркин, П. А. Привалов y Д. В. Чуриков. "Резонансное рассеяние плоских электромагнитных волн ГГЦ диапазона кольцевыми диэлектрическими линейными структурами". Оптика и спектроскопия 129, n.º 2 (2021): 214. http://dx.doi.org/10.21883/os.2021.02.50560.255-20.

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Reverse resonance scattering on the main magnetic mode and wave properties of linear structures consisting of subwavelength dielectric elements in the form of flat thin rings excited by displacement currents of an incident plane electromagnetic wave in the microwave range are studied. It is shown that for a single ring, the magnetic field at the main resonant frequency is concentrated inside the ring and in the near zone, and for structures consisting of two or more rings, the magnetic field is also registered in the far zone. The measured main magnetic resonances in the spectrum of electromagnetic fields of one and two flat rings coincide with the calculated resonant frequencies.

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4

Decker, M., T. Pertsch y I. Staude. "Strong coupling in hybrid metal–dielectric nanoresonators". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n.º 2090 (28 de marzo de 2017): 20160312. http://dx.doi.org/10.1098/rsta.2016.0312.

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We study resonant photonic–plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens’ source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic–plasmonic mode hybridization in the corresponding mode profiles. These characteristics show that strong coupling is established between the two different resonant systems in the hybrid nanostructure. Furthermore, our results demonstrate that in comparison with purely metallic or dielectric nanostructures, hybrid metal–dielectric nanoresonators offer higher flexibility in tailoring the fractions of light which are transmitted, absorbed and reflected by the nanostructure over a broad range of parameters without changing its material composition. As a special case, highly asymmetric reflection and absorption properties can be achieved. This article is part of the themed issue ‘New horizons for nanophotonics’.

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5

Melik-Gaykazyan, Elizaveta V., Maxim R. Shcherbakov, Alexander S. Shorokhov, Isabelle Staude, Igal Brener, Dragomir N. Neshev, Yuri S. Kivshar y Andrey A. Fedyanin. "Third-harmonic generation from Mie-type resonances of isolated all-dielectric nanoparticles". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n.º 2090 (28 de marzo de 2017): 20160281. http://dx.doi.org/10.1098/rsta.2016.0281.

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Subwavelength silicon nanoparticles are known to support strongly localized Mie-type modes, including those with resonant electric and magnetic dipolar polarizabilities. Here we compare experimentally the efficiency of the third-harmonic generation from isolated silicon nanodiscs for resonant excitation at the two types of dipolar resonances. Using nonlinear spectroscopy, we observe that the magnetic dipolar mode yields more efficient third-harmonic radiation in contrast to the electric dipolar (ED) mode. This is further supported by full-wave numerical simulations, where the volume-integrated local fields and the directly simulated nonlinear response are shown to be negligible at the ED resonance compared with the magnetic one. This article is part of the themed issue ‘New horizons for nanophotonics’.

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6

Han, Aoxue, Colm Dineen, Viktoriia E. Babicheva y Jerome V. Moloney. "Second harmonic generation in metasurfaces with multipole resonant coupling". Nanophotonics 9, n.º 11 (5 de julio de 2020): 3545–56. http://dx.doi.org/10.1515/nanoph-2020-0193.

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AbstractWe report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employing a hydrodynamic nonlinear Drude model implemented into Finite-Difference Time-Domain (FDTD) simulations, and effective polarizabilities of nanoparticle multipoles in the lattice are analytically calculated at the fundamental wavelength by using a coupled dipole–quadrupole approximation. Excitation of narrow collective resonances in nanoparticle arrays with electric quadrupole (EQ) and magnetic dipole (MD) resonant coupling leads to strong linear resonance enhancement. In this work, we analyze SHG in the vicinity of the lattice resonance corresponding to different nanoparticle multipoles and explore SHG efficiency by varying the lattice periods. Coupling of electric quadrupole and magnetic dipole in the nanoparticle lattice indicates symmetry breaking and the possibility of enhanced SHG under these conditions. By varying the structure parameters, we can change the strength of electric dipole (ED), EQ, and MD polarizabilities, which can be used to control the linewidth and magnitude of SHG emission in plasmonic lattices. Engineering of lattice resonances and associated magnetic dipole resonant excitations can be used for spectrally narrow nonlinear response as the SHG can be enhanced and controlled by higher multipole excitations and their lattice resonances. We show that both ED and EQ–MD lattice coupling contribute to SHG, but the presence of strong EQ–MD coupling is important for spectrally narrow SHG and, in our structure, excitation of narrow higher-order multipole lattice resonances results in five times enhancement.

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7

Pignol, G., S. Baeßler, V. V. Nesvizhevsky, K. Protasov, D. Rebreyend y A. Voronin. "Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement". Advances in High Energy Physics 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/628125.

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Gravitational resonance spectroscopy consists in measuring the energy spectrum of bouncing ultracold neutrons above a mirror by inducing resonant transitions between different discrete quantum levels. We discuss how to induce the resonances with a flow through arrangement in the GRANIT spectrometer, excited by an oscillating magnetic field gradient. The spectroscopy could be realized in two distinct modes (so called DC and AC) using the same device to produce the magnetic excitation. We present calculations demonstrating the feasibility of the newly proposed AC mode.

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8

Galtier, S., S. V. Nazarenko y A. C. Newell. "On wave turbulence in MHD". Nonlinear Processes in Geophysics 8, n.º 3 (30 de junio de 2001): 141–50. http://dx.doi.org/10.5194/npg-8-141-2001.

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Abstract. We describe the fundamental differences between weak (wave) turbulence in incompressible and weakly compressible MHD at the level of three-wave interactions. The main difference is in the structure of the resonant manifolds and the mechanisms of redistribution of spectral densities along the applied magnetic field B0. Similar to pure acoustic waves, a three-wave resonance between collinear wave vectors is observed but, in addition, we also have a resonance through tilted planes and spheres. The properties of resonances and their consequences for the asymptotics are also discussed.

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9

MALKOVA, M. y F. DOMINGUEZ-ADAME. "TRANSMISSION RESONANCES IN MAGNETIC STRUCTURES BASED ON NARROW-GAP SEMICONDUCTORS". Surface Review and Letters 07, n.º 01n02 (febrero de 2000): 123–26. http://dx.doi.org/10.1142/s0218625x00000166.

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In this work we are concerned with magnetic junction structures in which a homogeneous narrow-gap semiconductor is subjected to an inhomogeneous magnetic field, in an attempt to elucidate the band-structure effect on the resonance tunneling. Careful investigation of the transmission as a function of the energy shows that the resonances in the spectrum can appear. These are remnants of the Landau levels localized near the interface boundary. Comparing the solutions obtained within two-band and single-band models we found the allowed values of the momentum to be quite different, resulting in different resonant values of the transmission coefficient of electron transport through the magnetic interface.

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10

Kozlov, D. A. y A. S. Leonovich. "The structure of field line resonances in a dipole magnetosphere with moving plasma". Annales Geophysicae 26, n.º 3 (26 de marzo de 2008): 689–98. http://dx.doi.org/10.5194/angeo-26-689-2008.

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Abstract. A theoretical model of field line resonance in the magnetosphere with a dipole magnetic field and moving plasma was constructed. Motion of medium was simulated by its azimuthal rotation. Analytical and numerical solutions were found for MHD equations describing the structure of field line resonances. It was shown that a monochromatic, fast magnetosonic wave can excite several harmonics of standing Alfvén waves on different resonant surfaces at once. The resonant surface density is maximum in the transition layer at the magnetopause. The resonant oscillation amplitude profile becomes asymmetric in our model in regions with a maximum gradient of the background plasma velocity (plasmapause and magnetopause), in contrast to models with immobile plasma. In the same regions, the phase of resonant oscillations varies non-monotonically across the resonant surface which may serve as a detector of such regions in geomagnetic pulsation observations.

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11

Yan, Zhendong, Zhixing Zhang, Wei Du, Wenjuan Wu, Taoping Hu, Zi Yu, Ping Gu, Jing Chen y Chaojun Tang. "Graphene Multiple Fano Resonances Based on Asymmetric Hybrid Metamaterial". Nanomaterials 10, n.º 12 (2 de diciembre de 2020): 2408. http://dx.doi.org/10.3390/nano10122408.

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We theoretically investigate multiple Fano resonances in an asymmetric hybrid graphene–metal metamaterial. The multiple Fano resonances emerge from the coupling of the plasmonic narrow bonding and antibonding modes supported by an in-plane graphene nanoribbon dimer with the broad magnetic resonance mode supported by a gold split-ring resonator. It is found that the Fano resonant mode with its corresponding dark mode of the antibonding mode in the in-plane graphene nanoribbon dimer is only achieved by structural symmetry breaking. The multiple Fano resonances can be tailored by tuning the structural parameters and Fermi levels. Active control of the multiple Fano resonances enables the proposed metamaterial to be widely applied in optoelectronic devices such as tunable sensors, switches, and filters.

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12

Alkahby, H. Y. "On the coronal heating mechanism by the resonant absorption of Alfven waves". International Journal of Mathematics and Mathematical Sciences 16, n.º 4 (1993): 811–16. http://dx.doi.org/10.1155/s0161171293001012.

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In this paper, we will investigate the heating of the solar corona by the resonant absorption of Alfven waves in a viscous and isothermal atmosphere permeated by a horizontal magnetic field. It is shown that if the viscosity dominates the motion in a high (low)-βplasma, it creates an absorbing and reflecting layer and the heating process is acoustic (magnetoacoustic). When the magnetic field dominates the oscillatory process it creates a non-absorbing reflecting layer. Consequently, the heating process is magnetohydrodynamic. An equation for resonance is derived. It shows that resonances may occur for many values of the frequency and of the magnetic field if the wavelength is matched with the strength of the magnetic field. At the resonance frequencies, magnetic and kinetic energies will increase to very large values which may account for the heating process. When the motion is dominated by the combined effects of the viscosity and the magnetic field, the nature of the reflecting layer and the magnitude of the reflection coefficient depend on the relative strengths of the magnetic field and the viscosity.

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13

Kahraman, Adem, Mustafa Kahraman, Erol Bozdoğan, Fatih Alper y Metin Akgün. "Toraks difüzyon manyetik rezonans görüntüleme". Tuberk Toraks 62, n.º 3 (29 de septiembre de 2014): 215–30. http://dx.doi.org/10.5578/tt.8317.

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14

Yao, Yan Ping, Hong Yan Zhang y Zheng Geng. "Wireless Power Transfer Systems via Strong Coupled Magnetic Resonances — Design, PCB Implementation and Tests". Advanced Materials Research 383-390 (noviembre de 2011): 5984–89. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5984.

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In this paper, we present theoretical analysis and detailed design of a class of wireless power transfer (WPT) systems based on strong coupled magnetic resonances. We established the strong coupled resonance conditions for practically implementable WPT systems. We investigated the effects of non-ideal conditions presented in most practical systems on power transfer efficiency and proposed solutions to deal with these problems. We carried out a design of WPT system by using PCB (Printed Circuit Board) antenna pair, which showed strong coupled magnetic resonances. The innovations of our design include: (1) a new coil winding pattern for resonant coils that achieves a compact space volume, (2) fabrication of resonant coils on PCBs, and (3) integration of the entire system on a pair of PCBs. Extensive experiments were performed and experimental results showed that our WPT system setup achieved a guaranteed power transfer efficiency 14% over a distance of two times characteristic length(44cm). The wireless power transfer efficiency in this PCB based experimental system was sufficiently high to lighten up a LED with a signal generator.

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15

Yılmaz, Güliz, Işıl Başara, Gülgün Yılmaz Ovalı, Serdar Tarhan, Yüksel Pabuşcu y Hatice Mavioğlu. "Magnetic resonance imaging findings of Susac syndrome". Cumhuriyet Medical Journal 36, n.º 1 (28 de marzo de 2014): 96–100. http://dx.doi.org/10.7197/1305-0028.1215.

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16

Ünver, Mahmut y Atilla Ergüzen. "Compressing of Magnetic Resonance Images with Cuda". International Journal of Trend in Scientific Research and Development Volume-3, Issue-1 (31 de diciembre de 2018): 1140–45. http://dx.doi.org/10.31142/ijtsrd20209.

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17

Dilbar, Khodjieva. "Magnetic Resonance Imaging of Cerebral Hemorrhagic Stroke". International Journal of Psychosocial Rehabilitation 24, n.º 02 (20 de febrero de 2020): 434–38. http://dx.doi.org/10.37200/ijpr/v24i2/pr200354.

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18

Marzal, Vicente, Juan Carlos Torres, Isabel Pérez, José Manuel Sánchez-Pena y Braulio García-Cámara. "Induced Magnetic Anisotropy in Liquid Crystals Doped with Resonant Semiconductor Nanoparticles". Journal of Nanomaterials 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/7659074.

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Currently, there are many efforts to improve the electrooptical properties of liquid crystals by means of doping them with different types of nanoparticles. In addition, liquid crystals may be used as active media to dynamically control other interesting phenomena, such as light scattering resonances. In this sense, mixtures of resonant nanoparticles hosted in a liquid crystal could be a potential metamaterial with interesting properties. In this work, the artificial magnetism induced in a mixture of semiconductor nanoparticles surrounded by a liquid crystal is analyzed. Effective magnetic permeability of mixtures has been obtained using the Maxwell-Garnett effective medium theory. Furthermore, permeability variations with nanoparticles size and their concentration in the liquid crystal, as well as the magnetic anisotropy, have been studied.

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19

Li, Wei Xin y He Zhang. "Analysis of Wireless Energy Transfer System Using Magnetic Resonant Coupling". Advanced Materials Research 591-593 (noviembre de 2012): 1164–67. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1164.

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In order to research the relationship between coupling distance and transmission efficiency, study on the transmission characteristics of magnetic resonant coupling for wireless power transmission system, simulation model of wireless power transmission system via magnetic resonance coupling were established based on the theory of two ports network analysis method. The frequency expression of maximum efficiency and the resonant frequency splitting phenomenon condition of a contact-less power transmission system were derived. In a weak coupling at resonance, magnetic resonant coupling can transfer energy with high efficiency. The resonant frequency changes from two to one depending on the critical condition. Until a certain distance, maximum efficiencies are not got. The transmission characteristics of this system were researched by simulation software and experiments. The results show that the transmission characteristics are consistent with theoretical analysis and simulation.

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20

Uberoi, C. "Resonant absorption of Alfven Waves and the Associated Phenomenon of Magnetic Reconnection". Symposium - International Astronomical Union 142 (1990): 245–49. http://dx.doi.org/10.1017/s007418090008801x.

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The mathematical analysis of the Alfven Wave equation in inhomogeneous magnetic fields which explain the resonance absorption of Alfven surface waves near a resonant layer can also be used to show that magnetic reconnection process can arise near the zero frequency resonant layer driven by very low frequency Alfven surface waves. The associated phenomena of resonant absorption and magnetic reconnection in inhomogeneous plasmas can explain the recent obsrevations of intense magnetic activity in the long period geomagnetic micropulsations range, at magnetospheric cusp latitudes, during the time of occurence of flux transfer events.

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21

MD, Dr Prashanth Kumar K. S. "Magnetic Resonance Myelography in Evaluation of Degenerative Disc Disease of Lumbar Spine in Comparision with Conventional Magnetic Resonance Imaging of Lumbar Spine". Journal of Medical Science And clinical Research 04, n.º 11 (20 de noviembre de 2016): 14018–27. http://dx.doi.org/10.18535/jmscr/v4i11.84.

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22

Kravchenko, Eleonora A. "Magnetism of Bismuth(III) Oxide-Based Compounds". Solid State Phenomena 233-234 (julio de 2015): 113–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.113.

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209Bi NQR experiments, including analysis of zero-field line shapes, Zeeman-perturbed patterns and zero-field spin-echo envelopes were made to examine magnetic splitting of resonances revealed in the spectra of Main group element compounds of general composition BakBilAmOn (A=Al, В, Ge, Br, Cl). The results were explained assuming the existence in the compounds of ordered internal magnetic fields from 5 to 250 G which notably exceed those of nuclear magnetic moments. A dramatic (8−10-fold) increase in the resonance intensities, instead of broadening and fading, was observed for such compounds upon applying weak (below 500 Oe) external magnetic fields. The effect was shown to relate to the spin dynamics, namely, to the influence of external magnetic field on the nuclear spin-spin relaxation of the compounds with anomalous magnetic properties. In α-Bi2O3, paramagnetism depending on the thermal prehistory of a sample was found using SQUID-technique; magnetoelectric effect linear in magnetic field was also observed for this oxide.

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23

Atdayev, Agylych, Alexander L. Danilyuk y Serghej L. Prischepa. "Interaction of electromagnetic radiation in the 20–200 GHz frequency range with arrays of carbon nanotubes with ferromagnetic nanoparticles". Beilstein Journal of Nanotechnology 6 (24 de abril de 2015): 1056–64. http://dx.doi.org/10.3762/bjnano.6.106.

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The interaction of electromagnetic radiation with a magnetic nanocomposite based on carbon nanotubes (CNT) is considered within the model of distributed random nanoparticles with a core–shell morphology. The approach is based on a system composed of a CNT conducting resistive matrix, ferromagnetic inductive nanoparticles and the capacitive interface between the CNT matrix and the nanoparticles, which form resonance resistive–inductive–capacitive circuits. It is shown that the influence of the resonant circuits leads to the emergence of specific resonances, namely peaks and valleys in the frequency dependence of the permeability of the nanocomposite, and in the frequency dependence of the reflection and transmission of electromagnetic radiation.

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24

Evans, Paul G., Samuel D. Marks, Stephan Geprägs, Maxim Dietlein, Yves Joly, Minyi Dai, Jiamian Hu et al. "Resonant nanodiffraction x-ray imaging reveals role of magnetic domains in complex oxide spin caloritronics". Science Advances 6, n.º 40 (octubre de 2020): eaba9351. http://dx.doi.org/10.1126/sciadv.aba9351.

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Spin electronic devices based on crystalline oxide layers with nanoscale thicknesses involve complex structural and magnetic phenomena, including magnetic domains and the coupling of the magnetism to elastic and plastic crystallographic distortion. The magnetism of buried nanoscale layers has a substantial impact on spincaloritronic devices incorporating garnets and other oxides exhibiting the spin Seebeck effect (SSE). Synchrotron hard x-ray nanobeam diffraction techniques combine structural, elemental, and magnetic sensitivity and allow the magnetic domain configuration and structural distortion to be probed in buried layers simultaneously. Resonant scattering at the Gd L2 edge of Gd3Fe5O12 layers yields magnetic contrast with both linear and circular incident x-ray polarization. Domain patterns facet to form low-energy domain wall orientations but also are coupled to elastic features linked to epitaxial growth. Nanobeam magnetic diffraction images reveal diverse magnetic microstructure within emerging SSE materials and a strong coupling of the magnetism to crystallographic distortion.

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25

Zhou, Ziyao, Bin Peng, Mingmin Zhu y Ming Liu. "Voltage control of ferromagnetic resonance". Journal of Advanced Dielectrics 06, n.º 02 (junio de 2016): 1630005. http://dx.doi.org/10.1142/s2010135x1630005x.

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Voltage control of magnetism in multiferroics, where the ferromagnetism and ferroelectricity are simultaneously exhibiting, is of great importance to achieve compact, fast and energy efficient voltage controllable magnetic/microwave devices. Particularly, these devices are widely used in radar, aircraft, cell phones and satellites, where volume, response time and energy consumption is critical. Researchers realized electric field tuning of magnetic properties like magnetization, magnetic anisotropy and permeability in varied multiferroic heterostructures such as bulk, thin films and nanostructure by different magnetoelectric (ME) coupling mechanism: strain/stress, interfacial charge, spin–electromagnetic (EM) coupling and exchange coupling, etc. In this review, we focus on voltage control of ferromagnetic resonance (FMR) in multiferroics. ME coupling-induced FMR change is critical in microwave devices, where the electric field tuning of magnetic effective anisotropic field determines the tunability of the performance of microwave devices. Experimentally, FMR measurement technique is also an important method to determine the small effective magnetic field change in small amount of magnetic material precisely due to its high sensitivity and to reveal the deep science of multiferroics, especially, voltage control of magnetism in novel mechanisms like interfacial charge, spin–EM coupling and exchange coupling.

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CHEN, Z. Y., B. N. WAN, Y. J. SHI, H. J. JU, J. X. ZHU y H. F. LIANG. "Resonant interaction of runaway electrons with magnetic field ripple in tokamak plasmas". Journal of Plasma Physics 75, n.º 5 (octubre de 2009): 669–74. http://dx.doi.org/10.1017/s0022377809007843.

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AbstractThe toroidal magnetic field of tokamaks is generated by a finite number of coils, which slightly modulates the magnetic field and runaway electrons experience this modulation. The resonant interaction between runaway electrons and the magnetic field ripple has been observed in the HT-7 tokamak. The maximum energy of runaways in the edge region could be blocked by the resonance of gyromotion with the nth harmonic of the magnetic field ripple. This resonant interaction is favorable for the control of runaway energy.

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27

MA, TIANXING. "RESONANT SPIN POLARIZATION IN A TWO-DIMENSIONAL HOLE GAS". Modern Physics Letters B 25, n.º 15 (20 de junio de 2011): 1259–70. http://dx.doi.org/10.1142/s0217984911026279.

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Within the Luttinger Hamiltonian, electric-field-induced resonant spin polarization of a two-dimensional hole gas in a perpendicular magnetic field was studied. The spin polarization arising from splitting between the light and the heavy hole bands shows a resonant peak at a certain magnetic field. Especially, the competition between the Luttinger term and the structural inversion asymmetry leads to a rich resonant peaks structure, and the required magnetic field for the resonance may be effectively reduced by enlarging the effective width of the quantum well. Furthermore, the Zeeman splitting tends to move the resonant spin polarization to a relative high magnetic field and destroy these rich resonant spin phenomena. Finally, both the height and the weight of the resonant peak increase as the temperature decreases. It is believed that such resonant spin phenomena may be verified in the sample of a two-dimensional hole gas, and it may provide an efficient way to control spin polarization by an external electric field.

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28

Afanasiev, Dmytro, Jorrit R. Hortensius, Mattias Matthiesen, Samuel Mañas-Valero, Makars Šiškins, Martin Lee, Edouard Lesne et al. "Controlling the anisotropy of a van der Waals antiferromagnet with light". Science Advances 7, n.º 23 (junio de 2021): eabf3096. http://dx.doi.org/10.1126/sciadv.abf3096.

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Van der Waals magnets provide an ideal playground to explore the fundamentals of low-dimensional magnetism and open opportunities for ultrathin spin-processing devices. The Mermin-Wagner theorem dictates that as in reduced dimensions isotropic spin interactions cannot retain long-range correlations, the long-range spin order is stabilized by magnetic anisotropy. Here, using ultrashort pulses of light, we control magnetic anisotropy in the two-dimensional van der Waals antiferromagnet NiPS3. Tuning the photon energy in resonance with an orbital transition between crystal field split levels of the nickel ions, we demonstrate the selective activation of a subterahertz magnon mode with markedly two-dimensional behavior. The pump polarization control of the magnon amplitude confirms that the activation is governed by the photoinduced magnetic anisotropy axis emerging in response to photoexcitation of ground state electrons to states with a lower orbital symmetry. Our results establish pumping of orbital resonances as a promising route for manipulating magnetic order in low-dimensional (anti)ferromagnets.

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29

Kikuchi, Hiroyuki, Toshiyuki Kikuchi, Hiroshi Yamamoto, Toru Nagashima y Kaichi Isono. "Magnetic resonance imaging for biliary cancer". Japanese Journal of Gastroenterological Surgery 25, n.º 3 (1992): 938. http://dx.doi.org/10.5833/jjgs.25.938.

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İNCİ, Ercan, Özgür KILIÇKESMEZ, Bengi GÜRSES, Neslihan TAŞDELEN, Sibel AYDIN, Tan CİMİLLİ y Nevzat GÜRMEN. "Ovaryen Kitlelerin Görüntülenmesinde Kantitatif Difüzyon-Ağırlıklı Manyetik Rezonans". Turkiye Klinikleri Journal of Medical Sciences 31, n.º 1 (2011): 86–92. http://dx.doi.org/10.5336/medsci.2009-15860.

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31

Nam, Myung Jin. "A Review on Nuclear Magnetic Resonance Logging: Data Interpretation". Journal of the Korean Society of Mineral and Energy Resources Engineers 50, n.º 1 (2013): 144. http://dx.doi.org/10.12972/ksmer.2013.50.1.144.

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32

Demirci, Deniz, Yonca Anik, Ahmet Kaya, Bahar O. Ozgur, Ali Demirci y Turgay Ozgur. "Magnetic resonance spectroscopy of gastrocinemius muscle in running exercise". International Journal of Academic Research 5, n.º 6 (10 de diciembre de 2013): 72–77. http://dx.doi.org/10.7813/2075-4124.2013/5-6/a.10.

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33

Науменко, В. А., А. С. Гаранина, С. С. Водопьянов, А. А. Никитин, А. О. Преловская, Е. И. Демихов, М. А. Абакумов y А. Г. Мажуга. "Магнитно-резонансная томография для персонализированной оценки и прогнозирования эффективности доставки наноформуляций противоопухолевых препаратов". НАНОМЕДИЦИНА, n.º 6 (30 de diciembre de 2018): 22–26. http://dx.doi.org/10.24075/vrgmu.2018.086.

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Магнитно-резонансная томография (МРТ) широко используется для диагностики онкологических заболеваний, а также для исследования доставки препаратов на магнитных наноносителях. Накопление наночастиц в опухоли высоковариабельно в популяции и зависит от биологических факторов, которые во многом остаются не изученными. В последние годы было высказано предположение о возможности использования МРТ для предсказания ответа на терапию наноформулированными препаратами на основе скрининговых данных о накоплении в опухоли магнитно-контрастных диагностикумов. Несмотря на то, что пилотные испытания указывают на принципиальную возможность предложенного подхода, существует ряд концептуальных проблем и технических ограничений для внедрения технологии в клинику. В статье представлены современные представления о механизмах, определяющих эффективность доставки препаратов в опухоль, а также преимуществах и недостатках методов, позволяющих стратифицировать опухоли по степени накопления наночастиц. Дальнейшие исследования в данной области позволят разработать эффективные алгоритмы индивидуального лечения противоопухолевыми препаратами, доставляемыми на наночастицах.

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34

BERMAN, GENNADY P., ALAN R. BISHOP y BORIS M. CHERNOBROD. "QUANTUM ENGINEERING FOR THREAT REDUCTION AND HOMELAND SECURITY". International Journal of High Speed Electronics and Systems 17, n.º 03 (septiembre de 2007): 607–18. http://dx.doi.org/10.1142/s0129156407004813.

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We review the results of our current research on quantum engineering which include the theory, modeling and simulations of quantum devices for potential applications to threat reduction and homeland security. In particular, we discuss: (i) scalable solid-state quantum computation with qubits based on (a) nuclear spins of impurity atoms in solids, (b) superconducting junctions, and (c) unpaired electron spins of spin radicals in self-assembled organic materials; (ii) quantum neural devices; (iii) quantum annealing; (iv) novel magnetic memory devices based on magnetic tunneling junctions with large tunneling magnetoresistance; (v) terahertz detectors based on microcantilever as a light pressure sensor; (vi) BEC based interferometers; (vii) quantum microscopes with a single-spin resolution based on (a) a magnetic resonant force microscopy and (b) an optically detected magnetic resonance; and (viii) novel approach for suppression of fluctuations in free space high-speed optical communication. Finally, we describe the similarities between the behavior of cross sections in reactions with heavy nuclei in the regions of strongly overlapped resonances and electron conductivity in semiconductor heterostructures.

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35

Yang, Zhi Gang y Hai Feng Xie. "Design and Dynamic Modeling of Piezoelectric Resonant Air Pump with Magnetic Spring". Advanced Materials Research 531 (junio de 2012): 630–33. http://dx.doi.org/10.4028/www.scientific.net/amr.531.630.

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A novel piezoelectric resonant air pump with magnetic spring has been proposed which using magnetic spring to replace the traditional mechanical spring. Then a prototype is designed and produced and test is made. Effects on output flow and pressure by axial distance of magnetic spring are analyzed through theoretical analysis and actual measurement of the resonance pump output flow and output pressure. Experimental results indicate that the gas transportation capacity is improved by using this piezoelectric resonant air pump in this paper.

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36

DMITRIENKO, I. S. "Nonlinear non-stationary Alfvén resonance". Journal of Plasma Physics 62, n.º 2 (agosto de 1999): 145–64. http://dx.doi.org/10.1017/s0022377899007758.

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For a cold plasma that is inhomogeneous (in the direction across an external homogeneous magnetic field), the nonlinear equation describing the spatial structure and temporal behaviour of a non-stationary disturbance in a resonance layer is obtained. The matching conditions for a disturbance through the resonance layer are obtained, and in the linear limit give a well-known linear matching. It is shown that the spatial and temporal behaviour of the resonance disturbance and the evolution of the resonant absorption in terms of nonlinear theory are determined by the ratio of the nonlinear to linear non-stationary spatial scales. The spatial–temporal profile of the disturbance in the resonance layer and the resonant absorption for different values of this ratio are calculated. A nonlinear decrease in the resonant absorption and a stratification of the resonance disturbance are revealed.

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37

Саргсян, А., Т. А. Вартанян y Д. Саркисян. "Применение магнито-индуцированных переходов в атомах -=SUP=-87-=/SUP=-Rb в когерентных оптических процессах". Журнал технической физики 128, n.º 1 (2020): 16. http://dx.doi.org/10.21883/os.2020.01.48833.259-19.

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The prospects of using Fg = 1-Fe = 3 magnetically induced (MI) transitions of the 87Rb D2 line to form optical resonances in strong magnetic fields up to 3 kG have been experimentally demonstrated. A micrometer-thick cell filled with the Rb atomic vapor is used. A simple and convenient method for determining the magnetic induction with a micron spatial resolution is presented. In this case, there is no need for a reference frequency spectrum. The probability of the MI transition in the magnetic field range of 0.3–2 kG may exceed the probability of a “normal” atomic transition; therefore, it is reasonable to use MI transition at the frequency of “coupling” or probe lasers in Lambda- and V systems to form EIT- resonance (also called dark resonance) in the process of electromagnetically induced transparency (EIT). The formation of dark resonances in strong magnetic fields, when there is a frequency shift of the dark resonance up to ~ 10 GHz, has a number of practical applications. Note that when using “ordinary” atomic transitions in the Lambda- system for magnetic fields of > 1 kG, dark resonances are practically absent.

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38

Grenier, S., J. M. Tonnerre, E. Jal, M. Elzo y N. Jaouen. "Interfacial magnetism by resonant X-ray reflectivity". Acta Crystallographica Section A Foundations of Crystallography 67, a1 (22 de agosto de 2011): C60—C61. http://dx.doi.org/10.1107/s0108767311098564.

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39

Lander, G. H., W. G. Stirling, S. Langridge y Doon Gibbs. "Resonant X-ray scattering in 5f magnetism". Journal of Magnetism and Magnetic Materials 140-144 (febrero de 1995): 1349–52. http://dx.doi.org/10.1016/0304-8853(94)00569-9.

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40

Sakata, M., T. Kawasaki, T. Shibue, S. Tsuruta, H. Yoshimura y H. Namiki. "3P135 Magnetic tests and ferromagnetic resonance on Daphnia resting eggs". Seibutsu Butsuri 45, supplement (2005): S237. http://dx.doi.org/10.2142/biophys.45.s237_3.

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41

Jingjing Yu, Jingjing Yu, Huajin Chen Huajin Chen, Xinning Yu Xinning Yu y Shiyang Liu Shiyang Liu. "Unidirectional perfect magnetic metamaterial absorber based on nonreciprocal mie resonance". Chinese Optics Letters 12, s1 (2014): S11301–311304. http://dx.doi.org/10.3788/col201412.s11301.

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42

Xueting Zhang, Xueting Zhang, Guoqing Yang Guoqing Yang, Kang Dai Kang Dai y Ying Chen Ying Chen. "Ultra-narrow parametric magnetic resonances in a miniature vapor cell". Chinese Optics Letters 15, n.º 7 (2017): 070201. http://dx.doi.org/10.3788/col201715.070201.

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43

Nishanova, Yulduz, Marat Khodjibekov, Igor Juravlev y Sevinch Kurbanova. "Magnetic – Resonance Imaging in the Early Diagnosis of Breast Cancer". International Journal of Psychosocial Rehabilitation 24, Special Issue 1 (28 de febrero de 2020): 899–918. http://dx.doi.org/10.37200/ijpr/v24sp1/pr201234.

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44

Parida, Kalyani. "Magnetic Resonance Spectroscopy — Revisiting the Imaging Aspects of Brain Tumors". Journal of Medical Science And clinical Research 05, n.º 04 (30 de abril de 2017): 24205. http://dx.doi.org/10.18535/jmscr/v5i6.226.

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45

Raj, Abhishek, Alankrita, Akansha Srivastava y Vikrant Bhateja. "Computer Aided Detection of Brain Tumor in Magnetic Resonance Images". International Journal of Engineering and Technology 3, n.º 5 (2011): 523–32. http://dx.doi.org/10.7763/ijet.2011.v3.280.

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46

MIYAZAWA, TATSUO. "Nuclear Magnetic Resonance in Biochemistry". YAKUGAKU ZASSHI 105, n.º 11 (1985): 1009–18. http://dx.doi.org/10.1248/yakushi1947.105.11_1009.

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47

Wang, Hao, An Na Wang, Qiang Zhao y Yu Zhang. "Research on Wireless Power Transmission Based on Magnetic Resonance Coupling". Advanced Materials Research 811 (septiembre de 2013): 651–56. http://dx.doi.org/10.4028/www.scientific.net/amr.811.651.

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e. The formalism of wireless power transmission is discussed coupled mode theory can be used to describe the resonance process. According to the changing process of input impedance and input current to describe the demarcate of resonant frequency. also demonstrate that loop circuits have an important effect of the resonant magnetic field distribution.

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48

Nizami Huseyn, Elcin, Emin Taleh Mammadov y Mohammad Hoseini. "A REVIEW ON THE DIVISION OF MAGNETIC RESONANT PROSTATE IMAGES WITH DEEP LEARNING". NATURE AND SCIENCE 03, n.º 01 (5 de marzo de 2021): 13–17. http://dx.doi.org/10.36719/2707-1146/06/13-17.

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Deep learning; it is often used in dividing processes on images in the biomedical field. In recent years, it has been observed that there is an increase in the division procedures performed on prostate images using deep learning compared to other methods of image division. Looking at the literature; It is seen that the process of dividing prostate images, which are carried out with deep learning, is an important step for the diagnosis and treatment of prostate cancer. For this reason, in this study; to be a source for future splitting operations; deep learning splitting procedures on prostate images obtained from magnetic resonance (MRI) imaging devices were examined. Key words: deep learning, image division, prostate cancer

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49

Wang, Haidong, Teng Wu, He Wang, Sheng Li, Zaisheng Lin, Xiang Peng y Hong Guo. "A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts". Applied Sciences 10, n.º 10 (22 de mayo de 2020): 3608. http://dx.doi.org/10.3390/app10103608.

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We propose a compact 4He magnetometer realizing magnetic field measurement and laser-frequency stabilization simultaneously in a single 4He atomic cell. The frequency stabilization scheme is based on the asymmetric line shape of magnetic resonance which is induced by spatially inhomogeneous light shifts. We investigate the asymmetric line shape of the magnetic resonance signal theoretically and experimentally in laser pumped 4He magnetometer with the magneto-optical double-resonance configuration. Notice that, due to the asymmetric line shape, the in-phase component of the magnetic resonance signal is shown to have a linear dependence with respect to the laser frequency detuning and is used to actively lock the laser frequency to the resonant point. The method reduces the complexity of the system and improves the stability of the magnetometer, making the laser-pumped 4He magnetometer more compact and portable.

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50

Nonoyama, Shinji, Shinji Motoki y Jun-Ichiro Inoue. "Resonant Reflections in a Particle Conducting Through a Normal-Conductor–Superconductor Interface in Magnetic Fields". International Journal of Modern Physics B 17, n.º 15 (20 de junio de 2003): 2863–81. http://dx.doi.org/10.1142/s0217979203018600.

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A quantum resonance in the conduction through the normal-conductor–superconductor junction is investigated in the presence of a magnetic field using a numerical transfer matrix method. It is shown that dip-pairs in the conductance curve occur at a certain geometry of the system owing to the resonant reflection caused by the interference of the reflected electron and hole waves under a finite magnetic field. By examining a local density of quasiparticles, we found that the feature of the resonant state giving the dip-pair in the conductance (in a magnetic field) is very different from that in a finite bias voltage.

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