scholarly journals Сканирующий оптический квантовый магнитометр, основанный на явлении выжигания провалов

2019 ◽  
Vol 45 (10) ◽  
pp. 22
Author(s):  
А.Н. Анисимов ◽  
Р.А. Бабунц ◽  
И.Д. Бреев ◽  
А.П. Бундакова ◽  
И.В. Ильин ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Physical Phenomenon ◽  
Signal Frequency ◽  
Hole Burning ◽  
Atomic Size ◽  
Quantum Magnetometer ◽  
Optically Detected ◽  
High Frequency Resonance ◽  
The Magnetic Field

A scanning optical quantum magnetometer with submicron spatial resolution is proposed. It is based on the physical phenomenon of hole burning in an optically detected magnetic resonance (ODMR) signal. This signal has been registered on spin colour centers of atomic size in silicon carbide under conditions of a saturation of spin levels by additional high-frequency resonance pumping. The increase in sensitivity is due to the narrowing of the ODMR line and an increase in the slope of the dependence of the signal frequency on the magnetic field.

scholarly journals ANALYSIS OF HIGH-FREQUENCY C-CORE MAGNETIC FLUX LEAKAGES FOR BONE TUMOR WITH INDUCTION HEATING BY USING MULTI-COIL

2019 ◽  
Author(s):  
Metharak Jokpudsa ◽  
Supawat Kotchapradit ◽  
Chanchai Thongsopa ◽  
Thanaset Thosdeekoraphat
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Tumor Tissue ◽  
Low Frequency ◽  
Heat Energy ◽  
High Frequencies ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field ◽  
The Magnetic Field ◽  
Flux Leakage

High-frequency magnetic field has been developed pervasively. The induction of heat from the magnetic field can help to treat tumor tissue to a certain extent. Normally, treatment by the low-frequency magnetic field needed to be combined with magnetic substances. To assist in the induction of magnetic fields and reduce flux leakage. However, there are studies that have found that high frequencies can cause heat to tumor tissue. In this paper present, a new magnetic application will focus on the analysis of the high-frequency magnetic nickel core with multi-coil. In order to focus the heat energy using a high-frequency magnetic field into the tumor tissue. The magnetic coil was excited by 915 MHz signal and the combination of tissues used are muscle, bone, and tumor. The magnetic power on the heating predicted by the analytical model, the power loss density (2.98e-6 w/m3) was analyzed using the CST microwave studio.

Filamentation and collapse of Langmuir waves in a weak magnetic field

1982 ◽  
Vol 28 (1) ◽  
pp. 19-36 ◽  
Author(s):  
P. Rolland ◽  
S. G. Tagare
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Small Angle ◽  
Nonlinear Interaction ◽  
High Frequency ◽  
Weak Magnetic Field ◽  
Low Frequency ◽  
Langmuir Waves ◽  
The Magnetic Field

The filamentation and collapse of Langmuir waves in a weak magnetic field are analysed in two particular cases of low-frequency acoustic perturbations: (i) adiabatic perturbations which correspond to subsonic collapse, and (ii) nonadiabatic perturbations which correspond to supersonic collapse. Here the existence of Langmuir filaments and Langmuir collapse in a weak magnetic field are due to nonlinear interaction of high-frequency Langmuir waves (which make small angle with the external magnetic field) with low-frequency acoustic perturbations along the magnetic field.

Hysteresis of the Resonance Absorption in Y–Ba–Cu–O

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3292-3295
Author(s):  
Gy. Kovács ◽  
N. Khatiasvili ◽  
T. Porjesz ◽  
I. Vajda
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Applied Field ◽  
Resonance Absorption ◽  
High Frequency Field ◽  
Hysteretic Behaviour ◽  
Frequency Field ◽  
The Magnetic Field

The effect of weak d.c. magnetic field on the interaction between high–T c superconductors and high frequency field has been studied. The magnetic field (Bres) at which the most intensive change in the absorption could be obtained depended on the previously applied field and displayed a hysteretic behaviour but it did not depend on the frequency.

scholarly journals Cosmic ray driven dynamo in barred and ringed galaxies

2010 ◽  
Vol 6 (S274) ◽  
pp. 398-400
Author(s):  
K. Kulpa-Dybeł ◽  
K. Otmianowska-Mazur ◽  
B. Kulesza-Żydzik ◽  
G. Kowal ◽  
D. Wóltański ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
High Frequency ◽  
Galactic Disk ◽  
Cosmic Ray ◽  
Field Configuration ◽  
Magnetic Field Configuration ◽  
Global Evolution ◽  
Weak Magnetic Fields ◽  
The Magnetic Field

AbstractWe study the global evolution of the magnetic field and interstellar medium (ISM) of the barred and ringed galaxies in the presence of non-axisymmetric components of the potential, i.e. the bar and/or the oval perturbations. The magnetohydrodynamical dynamo is driven by cosmic rays (CR), which are continuously supplied to the disk by supernova (SN) remnants. Additionally, weak, dipolar and randomly oriented magnetic field is injected to the galactic disk during SN explosions. To compare our results directly with the observed properties of galaxies we construct realistic maps of high-frequency polarized radio emission. The main result is that CR driven dynamo can amplify weak magnetic fields up to few μG within few Gyr in barred and ringed galaxies. What is more, the modelled magnetic field configuration resembles maps of the polarized intensity observed in barred and ringed galaxies.

scholarly journals The Magnetic Fields in the Envelopes of Proto-Planetary Nebulae

1993 ◽  
Vol 155 ◽  
pp. 381-381 ◽  
Author(s):  
J.Y. Hu
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Signal To Noise Ratio ◽  
Planetary Nebulae ◽  
Frequency Resolution ◽  
High Signal ◽  
Max Planck ◽  
Molecular Line ◽  
Protoplanetary Nebulae ◽  
The Magnetic Field

It is possible that the magnetic field plays important role in the formation of planetary nebulae(Poscoli, 1992). In order to measure the strength of magnetic field in the envelope of protoplanetary nebulae(PPNe) we have used the Max-Planck-Institut fur Radioastronomie 100-m telescope at Effelsberg to obtain the high frequency resolution and high signal-to-noise ratio 1612 MHz spectra of PPNe, IRAS08005-2356, 18276-1431, and 20406+2953 in both circular polarization. The nature of PPN of these objects are confirmed by Slikhuis et al.(1991), Le Bertre(1987), and Hu et al.(1992) based on the extensive optical, infrared and radio molecular line observations.

scholarly journals Design of a Sensor Coil for Electromagnetic Induction Tomography

2018 ◽  
Vol 218 ◽  
pp. 02001 ◽  
Author(s):  
Banjarnahor Dita Ayu ◽  
Rohmadi Rohmadi ◽  
Amir Rudin ◽  
Imamul Muttakin ◽  
Warsito P. Taruno
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Induction ◽  
Signal Frequency ◽  
Receiver Coil ◽  
Voltage Difference ◽  
Conductivity Property ◽  
Optimum Parameters ◽  
Magnetic Induction Tomography ◽  
Tomography Method ◽  
The Magnetic Field

Electromagnetic tomography method works by utilizing magnetic field induced by coils that are given an electric current. An object with certain conductivity property interferes the magnetic field which will be sensed by the sensor in the form of voltage difference. Experiment using iron as an object has been conducted. In addition, parameters given are distance between transmitter and receiver coil, and frequency of transmitter signal. The result shows that conductive material gives significant voltage difference, which ranges between 0 – 0.072 V. The optimal transmitter-receiver coil distance is the shortest, while the optimal transmitter signal frequency is at 5MHz and 9MHz. Based on the optimum parameters gained, multi-channel magnetic induction tomography (MIT) sensor is designed. It contains four transmitter coils and four receiver coils. They are arranged in circle, which each transmitter and receiver pairs are in opposite location. The sensor proved to be able to sense voltage difference induced by an object. Samples of imaging are also successfully provided accordingly.

scholarly journals Quantum Relativistic Electron Gas Expanding in One Dimension

2017 ◽  
Vol 45 ◽  
pp. 1760045 ◽  
Author(s):  
Hugo Pérez Rojas ◽  
Elizabeth Rodríguez Querts ◽  
Aurora Pérez Martínez
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Vector Boson ◽  
Electron Gas ◽  
Electron System ◽  
One Dimension ◽  
Ferromagnetic Behavior ◽  
Boson Field ◽  
Magnetic Field Axis ◽  
The Magnetic Field

Under the action of field intensities around the Schwinger critical field, a dense electron gas behaves as unidimensional, exerting strong pressure along the applied field. We suggest a model for maintaining the magnetic field self-consistently, by assuming spin parallel pairing leading to a partial bosonization of the electron gas, which is described by a charged vector boson field, able to experience condensation, leading to a ferromagnetic behavior. Our aim is to suggest a possible quantum relativistic self-magnetized jet model. High frequency photons will be deviated also along paths parallel to the external field, leading to a model for a jet. Any addition of matter and/or energy to the electron system, would contribute to increase the kinetic energy along the magnetic field axis, an the jet may extend for long distances.

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