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Journal articles on the topic 'Magnetic field simulator'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Pastena, M., L. Sorrentino, and M. Grassi. "Design and Validation of the University of Naples Space Magnetic Field Simulator (SMAFIS)." Journal of the IEST 44, no. 1 (December 19, 2001): 33–42. http://dx.doi.org/10.17764/jiet.44.1.y2401q13726534t7.

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This paper discusses the design and validation of the space magnetic field simulator at the university of Naples. The simulator is designed to reproduce, with predetermined uniformity, the magnetic field vector as sensed by an orbiting satellite in the an assigned volume about the simulator's geometrical center. The simulator will be used primarily for ground testing the magnetic attitude control subsystem onboard the university microsatellite SMART. The paper describes the criteria as well as the mathematical model used for the simulator design. The design aims mainly at developing a simulator configuration that maximizes the volume in which the desired magnetic field vector is realized with a predetermined uniformity with respect to a nominal field. The simulator is configured as an open-loop system, in which fixed currents are used to nullify the local magnetic field. Precision currents are then added to the fixed ones to accurately reproduce, in the test volume, the in-orbit magnetic field vector variation. Results of the simulator validation tests are presented.

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2

Liñares, Jesús, Xesús Prieto-Blanco, Gabriel M. Carral, and María C. Nistal. "Quantum Photonic Simulation of Spin-Magnetic Field Coupling and Atom-Optical Field Interaction." Applied Sciences 10, no. 24 (December 10, 2020): 8850. http://dx.doi.org/10.3390/app10248850.

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In this work, we present the physical simulation of the dynamical and topological properties of atom-field quantum interacting systems by means of integrated quantum photonic devices. In particular, we simulate mechanical systems used, for example, for quantum processing and requiring a very complex technology such as a spin-1/2 particle interacting with an external classical time-dependent magnetic field and a two-level atom under the action of an external classical time-dependent electric (optical) field (light-matter interaction). The photonic device consists of integrated optical waveguides supporting two collinear or codirectional modes, which are coupled by integrated optical gratings. We show that the single-photon quantum description of the dynamics of this photonic device is a quantum physical simulation of both aforementioned interacting systems. The two-mode photonic device with a single-photon quantum state represents the quantum system, and the optical grating corresponds to an external field. Likewise, we also present the generation of Aharonov–Anandan geometric phases within this photonic device, which also appear in the simulated systems. On the other hand, this photonic simulator can be regarded as a basic brick for constructing more complex photonic simulators. We present a few examples where optical gratings interacting with several collinear and/or codirectional modes are used in order to illustrate the new possibilities for quantum simulation.

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3

Yang, Jin Xian. "Design and Application of Geomagnetic Dynamic Simulator." Key Engineering Materials 467-469 (February 2011): 1200–1205. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.1200.

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A geomagnetic dynamic simulator was designed, and attitude simulation application method was proposed. Three pairs of square Helmholtz coil system was designed, and the geomagnetic field was cancelled by DC current, forming a zero magnetic field space and generating controlled size and direction magnetic field. Three DC current sources were adopted to produce the current for canceling geomagnetic field and the desired magnetic field. The geomagnetic field was offset without three DC power, the premise of saving cost and ensure the accuracy. As the magnetometer accuracy and dynamic capability does not take into account two indicators, so calibration mode, select high-precision magnetometer, or for remanence measurements. The selection of simulation in the dynamic simulation using magnetometers can meet the small satellite in orbit simulation requirements.

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4

Kumar, Anil, Hasina Khatun, Nitin Kumar, Udaybir Singh, V. Vyas, and A. K. Sinha. "Particle-in-cell analysis of beam-wave interaction in gyrotron cavity with tapered magnetic field." Canadian Journal of Physics 88, no. 11 (November 2010): 857–61. http://dx.doi.org/10.1139/p10-078.

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A commercially available electromagnetic simulator — MAGIC, a particle-in-cell (PIC) code — has been used to carry out a comparative study of the beam-wave interaction under uniform and tapered magnetic field profiles of a 42 GHz, 200 kW gyrotron. The magnetic field profile across the resonant cavity varies by ±6.5% with a peak value of 1.615 T. The MAGIC simulation shows the desire performance of the gyrotron under both magnetic field conditions with an operating mode TE03 and a pitch factor of 1.26. The analysis of the simulated results show that stability in the power growth was reached more quickly and achieved higher output power in the case of a tapered magnetic field.

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5

Pastena, M., and M. Grassi. "Optimum design of a three-axis magnetic field simulator." IEEE Transactions on Aerospace and Electronic Systems 38, no. 2 (April 2002): 488–501. http://dx.doi.org/10.1109/taes.2002.1008981.

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6

Chung, Hyun-Ju, Chang-Seob Yang, and Woo-Jin Jung. "A Magnetic Field Separation Technique for a Scaled Model Ship through an Earth's Magnetic Field Simulator." Journal of Magnetics 20, no. 1 (March 31, 2015): 62–68. http://dx.doi.org/10.4283/jmag.2015.20.1.062.

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7

Wang, Wei. "The Simulation of Lane Based on Magnetic Markers Guidance in Laboratory." Advanced Materials Research 823 (October 2013): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.823.370.

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It is a high expense that the experiment of the testing vehicle based on magnetic markers carrying on outdoors. The distribution and movement of magnetic markers were simulated by direct-current electromagnet, using single chip microcomputer and power amplifier to control direct-current electromagnet. It cuts down the expense of experiment. This dissertation is focus on mainly the design of lane simulator. In the lane simulator, every 0.5m arranged a direct-current electromagnet. When the speed is 80km/h,the electrifying time of the direct-current electromagnet is 0.025s. And the electric voltage of the direct-current electromagnet is 24v, and the magnetic field intensity of the direct-current electromagnet is 12000Gs.

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8

EMURA, Takashi, Masaaki KUMAGAI, and Ryota NOMURA. "Magnetic Field Type 6-Axis Motion Capture System for Driving Simulator." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2002 (2002): 65–66. http://dx.doi.org/10.1299/jsmermd.2002.65_7.

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9

GILSON, ERIK P., RONALD C. DAVIDSON, PHILIP C. EFTHIMION, RICHARD MAJESKI, and HONG QIN. "The Paul Trap Simulator Experiment." Laser and Particle Beams 21, no. 4 (October 2003): 549–52. http://dx.doi.org/10.1017/s0263034603214129.

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The assembly of the Paul Trap Simulator Experiment (PTSX) is now complete and experimental operations have begun. The purpose of PTSX, a compact laboratory facility, is to simulate the nonlinear dynamics of intense charged particle beam propagation over a large distance through an alternating-gradient transport system. The simulation is possible because the quadrupole electric fields of the cylindrical Paul trap exert radial forces on the charged particles that are analogous to the radial forces that a periodic focusing quadrupole magnetic field exert on the beam particles in the beam frame. By controlling the waveform applied to the walls of the trap, PTSX will explore physics issues such as beam mismatch, envelope instabilities, halo particle production, compression techniques, collective wave excitations, and beam profile effects.

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10

Padun, O., Y. Kovalenko, B. Rassamakin, V. Ostapchuk, and A. Pynchuk. "DEVELOPING AND CREATION OF GROUND TESTING SIMULATOR FOR ORIENTATION AND STABILIZATION SYSTEM OF POLYITAN NANOSATELLITES." Journal of Rocket-Space Technology 27, no. 4 (December 30, 2019): 125–30. http://dx.doi.org/10.15421/451918.

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The article under the heading "Developing and creation of ground testing simulator for orientation and stabilization system of PolyITAN nanosatellites" is devoted to the research of methods of developing of the specialized simulator for the nanosatellite orientation and stabilization system ground testing. This problem is showed on the example of simulator developed in the National Technical Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”. Ground testing of the orientation and stabilization system is critically important phase of the pre-flight preparation of the nanosatellite. In order to provide precise tests, the simulator described in this article was developed. Objective of the simulator is to create targeted magnetic field in assured volume, where flight of the nanosatellite is imitated, stabilization and orientation performances are tested. The introduction describes experience of the PolyITAN team in developing of nanosatellites, the tasks of the first two nanosatellites - PolyITAN-1 and PolyITAN-2 are revealed, the actuality of this research is highlighted. The main part reveals the order of development of the simulator for orientation and stabilization system ground testing in gradual and sector-wise way. First part shows construction decisions in the simulator’s configuration to ensure accomplishment of the simulator’s objective. Second part describes calculation of the number of turns and the diameter of the wire to provide required value of the modulus of the vector of magnetic field induction, which is created by the simulator. Next part is devoted to calculation of power required for power sources, increment of magnetic field induction as a function of the current increment is provided, what is very important for power source selection. Next part is a research of the uniformity sphere - working space of the simulator, which must provide enough volume for testing of the 3U nanosatellites of CubeSat format. Final part describes control system of the simulator.

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11

Häpe, M., W. J. Becker, W. Ricken, A. Peters, H. Reeg, and A. Schlörit. "Development and Construction of a Simulator for High Frequency Magnetic Field Measurements." Sensor Letters 5, no. 1 (March 1, 2007): 333–36. http://dx.doi.org/10.1166/sl.2007.065.

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12

Nakano, Tomohito, Yoshihi Kawase, Tadashi Yamaguchi, Masanori Nakamura, Noriaki Nishikawa, and Hitoshi Uehara. "Parallel Computing of Magnetic Field for Rotating Machines on the Earth Simulator." IEEE Transactions on Magnetics 46, no. 8 (August 2010): 3273–76. http://dx.doi.org/10.1109/tmag.2010.2045225.

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13

Du, Lihang, Cheng Gao, Qi Zhang, Jianbao Wang, Rengtang Hong, and Dexin Qu. "Simulation and evaluation of leakage electric field of bounded-wave simulator." Journal of Electromagnetic Waves and Applications 33, no. 8 (February 22, 2019): 959–71. http://dx.doi.org/10.1080/09205071.2019.1577184.

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14

Takeuchi, N., Y. Yamanashi, Y. Saito, and N. Yoshikawa. "3D simulation of superconducting microwave devices with an electromagnetic-field simulator." Physica C: Superconductivity 469, no. 15-20 (October 2009): 1662–65. http://dx.doi.org/10.1016/j.physc.2009.05.039.

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15

Post, Mark Andrew, Junquan Li, and Regina Lee. "Design and Construction of a Magnetic Field Simulator for CubeSat Attitude Control Testing." Journal of Instrumentation, Automation and Systems 1, no. 1 (July 31, 2014): 1–9. http://dx.doi.org/10.21535/jias.v1i1.125.

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16

Piergentili, Fabrizio, Gian Paolo Candini, and Marco Zannoni. "Design, Manufacturing, and Test of a Real-Time, Three-Axis Magnetic Field Simulator." IEEE Transactions on Aerospace and Electronic Systems 47, no. 2 (April 2011): 1369–79. http://dx.doi.org/10.1109/taes.2011.5751264.

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17

Yang, Chang-Seob, Hyun-Ju Chung, and Jae-Jin Jeon. "A Study on Magnetic Signature Analysis Techniques of a Scaled Model Ship using Earth Magnetic Field Simulator." Journal of the Korea Institute of Military Science and Technology 16, no. 4 (August 5, 2013): 465–72. http://dx.doi.org/10.9766/kimst.2013.16.4.465.

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18

Hong, Na-Yeong, Hyunwoong Seo, Min-Kyu Son, Soo-Kyoung Kim, Song-Yi Park, Kandasamy Prabakar, and Hee-Je Kim. "Alignment ofTiO2(Anatase) Crystal of Dye-Sensitized Solar Cells by External Magnetic Field." International Journal of Photoenergy 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/638105.

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In this study, magnetic field (B) was applied on TiO2(anatase) of dye-sensitized solar cell (DSC) for alignment of crystal. Magnetic field was applied on TiO2when deposited TiO2on the fluorine tin oxide (FTO) was dried at 373 K for crystalline orientation. And applying time ofBwas varied 0~25 min. Characteristics of the magnetic field applied TiO2films were analyzed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Current-voltage characteristics were also analyzed using solar simulator, and it was confirmed that the energy conversion efficiency of 41% was increased. Finally, it was identified that the magnetic field affected orientation of TiO2, resulting in the enhancement of the performance of the DSC.

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19

Park, Bu S., and Sunder S. Rajan. "Novel Method to Improve the Uniformity of 7T Body MR Images." Concepts in Magnetic Resonance Part B 2021 (May 5, 2021): 1–9. http://dx.doi.org/10.1155/2021/6673923.

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When using ultrahigh-field MR systems (7T), the variations in the RF magnetic field can lead to significant loss in image uniformity. To optimize the overall MR image quality, the image region is divided into multiple smaller regions of interest (the ROIs), which can be independently optimized using transmit array optimization techniques including RF shimming, to improve RF magnetic fields and image intensity. Electromagnetic numerical simulations and corresponding transverse magnetization (|Mt|) acquired using the Bloch equation-based MRI simulator are used to evaluate the proposed method. Compared to the simulation results of quadrature driving method, mean and standard deviation (SD) of |Mt| in the full image (an inner diameter of 500 mm) were improved 47% (mean) and 48% (SD), whereas 94% (max) and 97% (mean) improved in the unaveraged SAR using the proposed method. The uniformity of |Mt| acquired using the method was especially improved in the peripheral region of the selected phantom image compared to that of other methods. The proposed method using multiple independently optimized ROIs and numerical simulations significantly improved the uniformity of |Mt| body images at 7T. This technique would be generally applicable to any high-field strength MR systems, which generate short RF wavelengths compared to the field of view.

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20

Terrones, Adrián, and Carlos Sabín. "Towards Quantum Simulation of Black Holes in a dc-SQUID Array." Universe 7, no. 12 (December 15, 2021): 499. http://dx.doi.org/10.3390/universe7120499.

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We propose quantum simulations of 1 + 1D radial sections of different black hole spacetimes (Schwarzschild, Reissner–Nordstrøm, Kerr and Kerr–Newman), by means of a dc-SQUID array embedded on an open transmission line. This was achieved by reproducing the spatiotemporal dependence of 1 + 1D sections of the spacetime metric with the propagation speed of the electromagnetic field in the simulator, which can be modulated by an external magnetic flux. We show that the generation of event horizons—and therefore Hawking radiation—in the simulator could be achieved for non-rotating black holes, although we discuss limitations related to fluctuations of the quantum phase. In the case of rotating black holes, it seems that the simulation of ergospheres is beyond reach.

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21

Liu, Wei, Xiangjun Gong, To Ngai, and Chi Wu. "Near-surface microrheology reveals dynamics and viscoelasticity of soft matter." Soft Matter 14, no. 48 (2018): 9764–76. http://dx.doi.org/10.1039/c8sm01886c.

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We report the development of a microrheology technique that incorporates a magnetic-field-induced simulator on total internal reflection microscopy (TIRM) to probe the near-surface dynamics and viscoelastic behaviors of soft matter like polymer solution/gels and colloidal dispersions.

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22

Peng, Yong-Bo, Roger Ghanem, and Jie Li. "Investigations of microstructured behaviors of magnetorheological suspensions." Journal of Intelligent Material Systems and Structures 23, no. 12 (May 28, 2012): 1351–70. http://dx.doi.org/10.1177/1045389x12447288.

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Microstructured behaviors of magnetorheological suspensions under magnetic fields with different magnitudes are investigated using a large-scale atomic/molecular massive parallel simulator. We investigated four kinds of typical characteristics of microstructured behaviors: (a) phase separation of structures, (b) statistics of chain and cluster sizes, (c) structural anisotropy of aggregates, and (d) fluctuation of suspensions. It is found that the higher the magnitude of external magnetic fields, the lesser the time the phase separation of structures undergoes. Magnetic dipolar particles, moreover, exhibit plane size-dependent structured behavior as they tend to cluster into nematic-like sheets along the shorter dimension of the field-perpendicular plane, even under conditions of uniform initial distribution and steady magnetic fields. In the presence of the shear, meanwhile, we observe that the suspensions move along with the flow field and connect to form long sheets along flow direction toward restraining the transportation of the shear flow. The application of the shear weakens the effect of the magnetic fields on the fluctuation of suspensions. Besides, the macroscale shear stress of magnetorheological suspensions is investigated as a function of the Mason number revealing that the constitutive model of rheological suspensions based on the Bingham law is of applicability.

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23

Marconcini, Paolo, and Massimo Macucci. "Transport Simulation of Graphene Devices with a Generic Potential in the Presence of an Orthogonal Magnetic Field." Nanomaterials 12, no. 7 (March 26, 2022): 1087. http://dx.doi.org/10.3390/nano12071087.

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The effect of an orthogonal magnetic field is introduced into a numerical simulator, based on the solution of the Dirac equation in the reciprocal space, for the study of transport in graphene devices consisting of armchair ribbons with a generic potential. Different approaches are proposed to reach this aim. Their efficiency and range of applicability are compared, with particular focus on the requirements in terms of model setup and on the possible numerical issues that may arise. Then, the extended code is successfully validated, simulating several interesting magnetic-related phenomena in graphene devices, including magnetic-field-induced energy-gap modulation, coherent electron focusing, and Aharonov–Bohm interference effects.

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24

IKEDA, Takahiro, Akira MATSUSHITA, Yasuhisa HASEGAWA, and Yoshiyuki SANKAI. "2P2-L09 Motion simulator for lower extremities in high magnetic field(Neurorobotics & Cognitive Robotics)." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2011 (2011): _2P2—L09_1—_2P2—L09_4. http://dx.doi.org/10.1299/jsmermd.2011._2p2-l09_1.

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25

Wilhelm, Johann, and Werner Renhart. "Exploiting the T(x) function in fast hysteresis models for transient circuit simulations." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 5 (September 2, 2019): 1427–40. http://dx.doi.org/10.1108/compel-12-2018-0532.

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Purpose The purpose of this paper is to investigate an alternative to established hysteresis models. Design/methodology/approach Different mathematical representations of the magnetic hysteresis are compared and some differences are briefly discussed. After this, the application of the T(x) function is presented and an inductor model is developed. Implementation details of the used transient circuit simulator code are further discussed. From real measurement results, parameters for the model are extracted. The results of the final simulation are finally discussed and compared to measurements. Findings The T(x) function possesses a fast mathematical formulation with very good accuracy. It is shown that this formulation is very well suited for an implementation in transient circuit simulator codes. Simulation results using the developed model are in very good agreement with measurements. Research limitations/implications For the purpose of this paper, only soft magnetic materials were considered. However, literature suggests, that the T(x) function can be extended to hard magnetic materials. Investigations on this topic are considered as future work. Originality/value While the mathematical background of the T(x) function is very well presented in the referenced papers, the application in a model of a real device is not very well discussed yet. The presented paper is directly applicable to typical problems in the field of power electronics.

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26

LI, YIMING. "COMPUTER SIMULATION OF MAGNETIZATION FOR 3D ELLIPSOIDAL TORUS-SHAPED InAs/GaAs QUANTUM RINGS." International Journal of Modern Physics C 14, no. 04 (May 2003): 501–7. http://dx.doi.org/10.1142/s0129183103004693.

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In this paper we computationally investigate the magnetization for three-dimensional (3D) InAs/GaAs nanorings with different radii in an external magnetic field. Our simulation model includes: (i) the effective mass Hamiltonian in nonparabolic approximation, (ii) the position- and energy-dependent quasi-particle effective mass approximation, (iii) the finite hard wall confinement potential, and (iv) the Ben Daniel–Duke boundary conditions. The nonlinear iterative method is applied to solve the 3D problem. With the developed computer simulator, we find the magnetization for the 3D InAs/GaAs ring is a negative function and oscillates nonperiodically. The oscillation saturates when the applied magnetic filed is increased. This result provides an alternative for the nanoring energy shell structure study and is useful for spintronics applications.

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27

Samluk, Jesse P., Cathleen A. Geiger, and Chester J. Weiss. "Full-physics 3-D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice." Annals of Glaciology 56, no. 69 (2015): 405–14. http://dx.doi.org/10.3189/2015aog69a737.

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AbstractIn this paper we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discretization of Maxwell’s equations and present 2-D sliced visualizations of their associated EM fields at discrete frequencies. Several interesting observations result: First, since the simulator computes the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the complete, coupled interactions between air, snow, sea ice and sea water as a function of their conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features are violated. But the most important new finding is that changes in conductivity affect EM field response by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and magnetic fields. These effects are demonstrated through a visual feature we define as ‘null lines’. Null line shape is affected by changes in conductivity near material boundaries as well as transmitter location. Our results encourage the use of null lines as a planning tool for better ground-truth field measurements near deformed ice types.

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28

Miyazawa, H., M. Koizumi, T. Mizuta, K. Oku, S. Shirai, and I. Yoshimi. "Development of an electron optics simulator to consider the 3-D magnetic deflection field in CRTs." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 363, no. 1-2 (September 1995): 341–46. http://dx.doi.org/10.1016/0168-9002(95)00325-8.

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29

Then, Yi Lung, Kok Yeow You, Mohamad Ngasri Dimon, and Wei Ying Lai. "Evaluation of the Equivalent Lumped Element Parameters of Modified Microstrip Ring Resonator." Applied Mechanics and Materials 735 (February 2015): 278–81. http://dx.doi.org/10.4028/www.scientific.net/amm.735.278.

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Microstrip ring resonator (MRR) sensor was modeled by simple equivalent lumped element circuits in free space based on simulation data obtained from Microwave Office (AWR) simulator and comparison was made with the measurements using the E5071C Network Analyzer. The calculated reflection coefficient, |G| and complex input impedanceZinusing lumped element model were compared with the measurements results. Both results showed well agreement with a little discrepancy, basically due to imperfect soldering. The MRR was designed to have operating frequencies between 0.5 GHz and 4.5 GHz. The maximum surrounding of magnetic field,Hϕis within 15 A/m in free space.

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PARK, MIN GYU, SANG KWANG BANG, SEONG HWAL SHIN, KI WOONG SEONG, and JYUNG HYUN LEE. "ALTERNATING MAGNETIC FIELD GENERATOR FOR THREE-DIMENSIONAL POSITION TRACKING OF MEDICAL TREATMENT EQUIPMENT FOR TRAINING." Journal of Mechanics in Medicine and Biology 21, no. 05 (April 21, 2021): 2140027. http://dx.doi.org/10.1142/s0219519421400273.

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In recent years, the incidence of cardiovascular disease is high due to the aging population and westernization of dietary habits, what encourages researching new methods. Most cardiovascular procedures use the catheter. In the procedure using a catheter, a long time of training is required to lower the procedure risk. So, a medical training simulator is being developed. In the actual procedure, the position of the catheter is confirmed by a C-arm using X-ray, but there is a risk of over exposure to radiation if the X-ray device is used until training. To solve this problem, in previous studies, the position of the catheter was tracked using a permanent magnet. However, the method of permanent magnet has a high error value due to the shape of the external magnetic flux density and the interference of environmental magnetic field. In this paper, an alternating magnetic field generator is proposed for 3D position tracking of medical equipment for training. An electromagnet with an optimal shape was designed through finite element analysis. The designed electromagnet is implemented and tested to confirm the performance. Through the location tracking experiment, an equation to estimate the distance between the electromagnet and the Hall sensor in 3D space was derived by linear regression recursive method. Through the derived equation, it was possible to track the position of the electromagnet at any position in the 3D space. Unlike previous studies using permanent magnets, the proposed alternating magnetic field generator has an isotropic shape with an external magnetic flux density according to the same distance. So, it is possible to reduce errors in position and distance, and minimize the effect of environmental magnetic fields by using an alternating magnetic field.

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31

Zuffada, C., and N. Engheta. "Field Uniformity Criteria for the Design of a Two-Wire EMP Simulator." Electromagnetics 8, no. 1 (January 1988): 29–35. http://dx.doi.org/10.1080/02726348808908203.

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32

Nakano, Tomohito, Yoshihiro Kawase, Tadashi Yamaguchi, Yoshiyasu Shibayama, Masanori Nakamura, Noriaki Nishikawa, and Hitoshi Uehara. "Parallel Computing of Magnetic Field Analysis for Rotating Machines Driven by Voltage Source on the Earth Simulator." IEEJ Transactions on Industry Applications 131, no. 10 (2011): 1212–16. http://dx.doi.org/10.1541/ieejias.131.1212.

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33

Wang, Xingjuan, Hebin Jin, Liguang Zhu, Ran Liu, and Tushun Song. "Effect of high-frequency electromagnetic field on microstructure of mold flux." High Temperature Materials and Processes 39, no. 1 (August 7, 2020): 368–76. http://dx.doi.org/10.1515/htmp-2020-0037.

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AbstractSoft-contact of molten steel can be achieved by applying a high-frequency electromagnetic field above the mold of continuous casting, which can effectively eliminate surface defects and achieve billets with no cracks and no oscillation marks. It also has some influence on the mold flux. In this study, the effect of a high-frequency electromagnetic field (20 kHz) on a mold flux flow field was simulated using a finite element software, and the slag film was extracted using a slag film simulator. The effect of the high-frequency magnetic field on the microstructure of the mold flux was analyzed using X-ray diffraction, Raman spectroscopy, and mineral phase testing. The results show that the high-frequency electromagnetic field disrupts the orderly movement and increases the movement rate of the liquid flux. The precipitate phase of the slag film did not change, but the silicate dimer Q1 decreased, the chain Q2 increased, and the network degree was increased. The slag film structure changed from the original two-layer form of crystalline layer–glass layer into a three-layer form of crystal layer–glass layer–crystal, and the crystallization ratio increased by 35% on average. The grain-size melilite granularity was reduced from the original 0.12 to 0.005 mm.

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Louis, C. K., S. L. G. Hess, B. Cecconi, P. Zarka, L. Lamy, S. Aicardi, and A. Loh. "ExPRES: an Exoplanetary and Planetary Radio Emissions Simulator." Astronomy & Astrophysics 627 (June 27, 2019): A30. http://dx.doi.org/10.1051/0004-6361/201935161.

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Context. Earth and outer planets are known to produce intense non-thermal radio emissions through a mechanism known as cyclotron maser instability (CMI), requiring the presence of accelerated electrons generally arising from magnetospheric current systems. In return, radio emissions are a good probe of these current systems and acceleration processes. The CMI generates highly anisotropic emissions and leads to important visibility effects, which have to be taken into account when interpreting the data. Several studies have shown that modelling the radio source anisotropic beaming pattern can reveal a wealth of physical information about the planetary or exoplanetary magnetospheres that produce these emissions. Aims. We present a numerical tool, called ExPRES (Exoplanetary and Planetary Radio Emission Simulator), which is able to reproduce the occurrence in a time-frequency plane of R−X CMI-generated radio emissions from planetary magnetospheres, exoplanets, or star–planet interacting systems. Special attention is given to the computation of the radio emission beaming at and near its source. Methods. We explain what physical information about the system can be drawn from such radio observations, and how it is obtained. This information may include the location and dynamics of the radio sources, the type of current system leading to electron acceleration and their energy, and, for exoplanetary systems, the orbital period of the emitting body and the strength, rotation period, tilt, and the offset of the planetary magnetic field. Most of these parameters can only be remotely measured via radio observations. Results. The ExPRES code provides the proper framework of analysis and interpretation for past, current, and future observations of planetary radio emissions, as well as for future detection of radio emissions from exoplanetary systems (or magnetic, white dwarf–planet or white dwarf–brown dwarf systems). Our methodology can be easily adapted to simulate specific observations once effective detection is achieved.

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Hou, Yong-shen. "Simplified Model and Simulation Analysis of Ferrite Hollow Bead Coating Based on Computer Aided Design Method." Journal of Physics: Conference Series 2174, no. 1 (January 1, 2022): 012068. http://dx.doi.org/10.1088/1742-6596/2174/1/012068.

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Abstract When ferrite hollow beads were made into coating materials, because ferrite hollow beads had hollow internal structure and conductive and magnetic ball wall, ferrite hollow beads have typical resonant ball characteristics in structure. The absorbing coating composed of numerous ferrite hollow beads could be considered as a resonant absorber. With the rapid development of information technology, especially computer technology, the introduction of computer simulation technology can often save experimental costs and reduce the blindness of experiments. Therefore, in order to comply with this development trend, this chapter will establish the absorber model of ferrite hollow bead coating based on HFSS (high frequency simulator structure) electromagnetic simulation software, and qualitatively analyze the relationship between the thickness of ferrite hollow bead coating and the resonant frequency of absorber and the distribution state of electromagnetic field inside the coating through the of computer simulation software.

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Kumar, Arun, P. S. T. N. Srinivas, Shiv Bhushan, Sarvesh Dubey, Yatendra Kumar Singh, and Pramod Kumar Tiwari. "Threshold Voltage Modeling of Double Gate-All-Around Metal-Oxide-Semiconductor Field-Effect-Transistors (DGAA MOSFETs) Including the Fringing Field Effects." Journal of Nanoelectronics and Optoelectronics 14, no. 11 (November 1, 2019): 1555–64. http://dx.doi.org/10.1166/jno.2019.2658.

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In this paper, an analytical threshold voltage model of double gate-all-around metal-oxide-semiconductorfield-effect-transistors (DGAA MOSFETs) including the fringing field effects is developed. The total fringing capacitance arising due to induced fringing fields in the device is divided into inner, outer and bottom fringing capacitance. A simple expression for each fringe capacitance is developed individually. The 3-D Poisson's equation has been solved in the channel region using the parabolic potential approximation method to develop the surface potential expressions. The effects of fringing capacitances of inner and outer gates which causes charge induction in the source/drain regions have been incorporated within the developed surface potential expressions. The change in potential due to these induced charges of source/drain region along the channel is formulated and added with the developed surface potential expression at both surfaces. The obtained modified surface potential equations have been utilized to derive the expression of the threshold voltage of the device. The performance of the proposed model has been compared with the previously developed model of DGAA MOSFET structure without High-k dielectrics. The effects of variation of device parameters on the threshold voltage have been also analyzed. The accuracy of the proposed model has been verified by numerical simulation results obtained by a device simulator VTCAD from Cogenda Int.

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Muksin, Ali, Ridanto Eko Poetro, and Robertus Heru Triharjanto. "PICO-SATELLITE DETUMBLING SIMULATION USING MAGNETIC ATITUDE ACTUATOR (SIMULASI DETUMBLING PADA SATELIT PIKO MENGGUNAKAN AKTUATOR SIKAP MAGNETIK)." Jurnal Teknologi Dirgantara 15, no. 1 (December 14, 2017): 11. http://dx.doi.org/10.30536/j.jtd.2017.v15.a2524.

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One of the methods to control Nano/pico-satellite’s attitude is using magneto-torquers as attitude actuators. ITB, at the moment is planning to develop a cubesat. Therefore, the objective of the research was to investigate the performance of such attitude control system for 3U class cubesat. The research used Matlab/simulink-based satellite simulator developed by LAPAN and ITB, and B-dot control law. The advantages of the method are that the actuators are small and lighter compared to the other type of actuators, such as momentum wheels or reaction wheels. However, the disadvantages is that the torques can be created only when the actuator oriented at non-zero angle with local magnetic field. The results showed that the attitude control system could performed the detumbling operation, with the best transient time at about two orbits period. Varying the gain parameter in the controller may result into variation of transient time and even unstability. AbstrakSalah satu cara untuk mengendalikan sikap satelit nano/piko adalah dengan menggunakan magneto-torquer sebagai aktuator. Saat ini ITB tengah mewacanakan pengembangan cubesat, sehinggga tujuan dari penelitian ini adalah untuk mengevaluasi kinerja sistem kendali sikap berdasarkan medan magnet Bumi pada cubesat kelas 3U. Penelitian ini menggunakan simulator satelit berbasis MATLAB/simulink yang dikembangkan oleh LAPAN dan ITB, moda kendalinya berbasis hukum kendali b-dot. Keuntungan dari sistem kendali ini adalah ukuran dan beratnya yang kecil, dibandingkan dengan moda kendali lain, seperti momentum wheel atau reaction wheel. Sementara kerugiannya adalah hanya bisa menghasilkan torsi saat aktuator mempunyai sudut tidak nol dengan medan magnet Bumi. Hasil menunjukkan bahwa moda kendali tersebut dapat melakukan manuver de-tumbling, dengan waktu transient terbaik mendekati dua periode orbit. Juga ditunjukkan bahwa variasi waktu transient dan ketidakstabilan dapat diperoleh dengan memvariasikan parameter gain pada kontroler.

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TREW, R. J., and M. W. SHIN. "HIGH FREQUENCY, HIGH TEMPERATURE FIELD-EFFECT TRANSISTORS FABRICATED FROM WIDE BAND GAP SEMICONDUCTORS." International Journal of High Speed Electronics and Systems 06, no. 01 (March 1995): 211–36. http://dx.doi.org/10.1142/s0129156495000067.

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Electronic and optical devices fabricated from wide band gap semiconductors have many properties ideal for high temperature, high frequency, high power, and radiation hard applications. Progress in wide band gap semiconductor materials growth has been impressive and high quality epitaxial layers are becoming available. Useful devices, particularly those fabricated from SiC, are rapidly approaching the commercialization stage. In particular, MESFETs (MEtal Semiconductor Field-Effect Transistors) fabricated from wide band gap semiconductors have the potential to be useful in microwave power amplifier and oscillator applications. In this work the microwave performance of MESFETs fabricated from SiC, GaN and semiconducting diamond is investigated with a theoretical simulator and the results compared to experimental measurements. Excellent agreement between the simulated and measured data is obtained. It is demonstrated that microwave power amplifiers fabricated from these semiconductors offer superior performance, particularly at elevated temperatures compared to similar components fabricated from the commonly employed GaAs MESFETs.

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Bakry, Mostafa, and Ludger Klinkenbusch. "Application of Kramers-Kronig transformations to increase the bandwidth of small antennas." Advances in Radio Science 17 (September 19, 2019): 65–70. http://dx.doi.org/10.5194/ars-17-65-2019.

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Abstract. The internally stored electric energy (Q-energy) of a disk monopole antenna increases as compared to a monopole antenna without a top disk. Recently it was shown that the Q-energy can be significantly reduced and the bandwidth increased by shielding the disk monopole antenna using a thin magnetic material. In the present paper we consider the same structure to explain another method to increase the bandwidth by using a shield made of dispersive magnetic material. We apply the Kramers-Kronig transforms to derive physically correct real and imaginary parts of the dispersive magnetic material. We do not aim at a reduction of the internal energy but at a compensation of the electric by a magnetic stored energy for a wide frequency range. Disk monopole antennas with shells consisting of such dispersive permeability are finally numerically evaluated by means of a commercial frequency-domain field simulator.

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Kristensen, Brian Holch, Finn Jørgen Laursen, Vibeke Løgager, Poul Flemming Geertsen, and Anders Krarup-Hansen. "Dosimetric and geometric evaluation of an open low-field magnetic resonance simulator for radiotherapy treatment planning of brain tumours." Radiotherapy and Oncology 87, no. 1 (April 2008): 100–109. http://dx.doi.org/10.1016/j.radonc.2008.01.014.

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Iijima, T., S. Hagiwara, S. Tanaka, A. Tonegawa, Kazutaka Kawamura, and Kohnosuke Sato. "Ion Acceleration by Ion-Cyclotron Resonance in Non-Uniform Magnetic Field Using the TPD-Sheet IV Linear Divertor Simulator." Fusion Science and Technology 63, no. 1T (May 2013): 417–19. http://dx.doi.org/10.13182/fst13-a16973.

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42

Xu Cheng, J. K. O. Sin, J. Shen, Yong-jin Huai, Rui-zhen Li, Yu Wu, and Bao-wei Kang. "A general design methodology for the optimal multiple-field-limiting-ring structure using device simulator." IEEE Transactions on Electron Devices 50, no. 11 (November 2003): 2273–79. http://dx.doi.org/10.1109/ted.2003.815132.

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Kim, KiHyuk, GyoungBum Kim, Seung Yong Cha, and SungWoo Hwang. "Construction of an RF-band test fixture model using 3-D field simulator." Microwave and Optical Technology Letters 48, no. 3 (2006): 498–500. http://dx.doi.org/10.1002/mop.21390.

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Takimoto, Toshikio, Ryuta Endo, Akira Tonegawa, and Kohnosuke Sato. "Investigating the effects of a magnetic field divergence on plasma heat load using the linear divertor simulator TPD-Sheet IV." Nuclear Materials and Energy 19 (May 2019): 352–57. http://dx.doi.org/10.1016/j.nme.2019.02.026.

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CHEN, HSING-YI. "Electric Field Distributions Inside a Large Wire-Array NEMP Simulator by the Time-Domain Moment Method." Electromagnetics 23, no. 4 (January 2003): 373–86. http://dx.doi.org/10.1080/02726340390202541.

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Cerdeira, A., M. Estrada, and M. A. Pavanello. "On the compact modelling of Si nanowire and Si nanosheet MOSFETs." Semiconductor Science and Technology 37, no. 2 (January 5, 2022): 025014. http://dx.doi.org/10.1088/1361-6641/ac45c0.

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Abstract In this paper, three-dimensional technology computer aided design simulations are used to show that the electron concentration, current density, and electric field distribution from the interface at the lateral channels and from the top channel to the centre of the silicon wire, in nanowire and nanosheet structures, are practically same. This characteristic makes it possible to consider that the total channel width for these structures is equal to the perimeter of the transistor sheet, allowing to extend of the application of the symmetric doped double-gate model (SDDGM) model to nanowires and nanosheets metal-oxide-semiconductor field effect transistors, with no need to include new parameters. The model SDDGM is validated for this application using several measured and simulated structures of nanowires and nanosheets transistors, with different aspect ratios of fin width and fin height, showing very good agreement between measured or simulated characteristics and modelled. SDDGM is encoded in Verilog-A language and implemented in the SmartSPICE circuit simulator.

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Cirkovic, Sasa, Jasna Ristic-Djurovic, Alexey Vorozhtsov, and Serguei Vorozhtsov. "Calibration of the simulation model of the VINCY cyclotron magnet." Nuclear Technology and Radiation Protection 17, no. 1-2 (2002): 13–18. http://dx.doi.org/10.2298/ntrp0202013c.

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The MERMAID program will be used to isochronise the nominal magnetic field of the VINCY Cyclotron. This program simulates the response, i. e. calculates the magnetic field, of a previously defined model of a magnet. The accuracy of 3D field calculation depends on the density of the grid points in the simulation model grid. The size of the VINCY Cyclotron and the maximum number of grid points in the XY plane limited by MERMAID define the maximumobtainable accuracy of field calculations. Comparisons of the field simulated with maximum obtainable accuracy with the magnetic field measured in the first phase of the VINCY Cyclotron magnetic field measurements campaign has shown that the difference between these two fields is not as small as required. Further decrease of the difference between these fields is obtained by the simulation model calibration, i. e. by adjusting the current through the main coils in the simulation model.

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Kumar, Ningombam Ajit, Aheibam Dinamani Singh, and Nameirakpam Basanta Singh. "Examining the Short Channel Characteristic and Performance of Triple Material Double Gate Silicon-on-Nothing Metal Oxide Semiconductor Field Effect Transistors with Grading Channel Concentration." Journal of Nanoelectronics and Optoelectronics 14, no. 12 (December 1, 2019): 1672–79. http://dx.doi.org/10.1166/jno.2019.2667.

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A 2D surface potential analytical model of a channel with graded channel triple material double gate (GCTMDG) Silicon-on-Nothing (SON) MOSFET is proposed by intermixing the benefits of triple material in gate engineering and graded doping in the channel. The surface potential distribution function of the GCTMDG SON MOSFET is obtained by solving the Poisson's equation, applying suitable boundary conditions, and using a parabolic approximation method. It is seen in the proposed device that the Short Channel Effects (SCEs) are subdued due to the apprehensible step in the surface potential profile that screen the potential of the drain. The effects of the various device parameters are studied to check the merit of the device. For the validation of the proposed device, it is compared with the simulated results of ATLASTM, a device simulator from SILVACO.

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Iancu, Voichiţa, Luis Diez, Emil Sluşanschi, and Ramón Agüero. "Balancing the Electromagnetic Field Exposure in Wireless Multi-Hop Networks: An EMF-Aware Routing Scheme." Mathematics 10, no. 4 (February 21, 2022): 668. http://dx.doi.org/10.3390/math10040668.

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This work is situated at the conjunction of the fields of distributed systems, telecommunications, and mathematical modeling, aiming to offer solutions to the problem of people’s overexposure to electro-magnetic fields (EMF) radiation. In this paper, we propose a new routing scheme for wireless multi-hop networks, which seeks a fairer distribution of the exposure to electromagnetic fields, by leveraging a combination of the transmitted power and the accumulated exposure as a routing metric. We carry out a holistic approach, including: (1) an algorithmic study, (2) an analytical model of the aforementioned novel routing metric, and (3) the specification of a routing protocol. We make a performance assessment of our novel routing protocol and the corresponding algorithm, by means of an extensive simulation campaign over the NS-3 simulator. The obtained results yield that the proposed novel solution is able to not only fairly distribute the exposure, but also to reduce its average value, thus enhancing the user experience. We also show that the power consumption using the EMF-aware proposed solution, based on Cycle Canceling Algorithm (CCA), and that observed with an approach seeking power reduction are alike. Indeed, even if there exist key-differences from the user experience’s point of view between both routing approaches, there is no statistically relevant power increase between them. Thus, our solution manages to keep the consumed power at a low level, and at the same time it reduces the overall nodes’ exposure to EMF.

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KURISUNO, Atsuya, Satoshi NAKAMOTO, Kazuya ICHIMURA, Hiromasa TAKENO, Yuichi FURUYAMA, and Akira TANIIKE. "Improvement of Electron Recovery Using a Magnetic Field with a Low Mirror Ratio in a Secondary Electron Direct Energy Converter Simulator." Plasma and Fusion Research 15 (July 2, 2020): 2405046. http://dx.doi.org/10.1585/pfr.15.2405046.

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