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Journal articles on the topic 'Radiation effect of moving magnet'

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Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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1

Vijaya, Kolli, Gurrampati Venkata Ramana Reddy, and Oluwole Daniel Makinde. "Soret Effect on MHD Casson Fluid Flow Past a Moving Vertical Plate in the Presence of Radiation and Chemical Reaction." Diffusion Foundations 26 (March 2020): 86–103. http://dx.doi.org/10.4028/www.scientific.net/df.26.86.

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In the Present study Soret effect on Magneto Hydro dynamic (MHD) steadytwo-dimensional free convective Casson fluid flow past a moving vertical plate in the presence of thermal radiation and chemical reaction is analysed. The governing partial differential equations of the flow, momentum, energy and mass are transformed into ordinary differential equations using suitable similarity variables. These Non-linear systems of ordinarydifferential equations are solved using Runge - Kutta method along with shooting technique. The effects of various parameters on the velocity, temperature and concentration are discussed. The Skin-friction, Nusselt number and Sherwood number are discussed in detail.
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2

Mohd Zokri, S., N. S. Arifin, A. R. Mohd Kasim, and Mohd Zuki Salleh. "Passive Control of Nanoparticles on MHD Jeffrey Nanofluid past a Convectively Heated Moving Plate with Thermal Radiation." International Journal of Automotive and Mechanical Engineering 15, no. 4 (December 24, 2018): 5775–92. http://dx.doi.org/10.15282/ijame.15.4.2018.5.0442.

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A theoretical study is conducted to investigate the thermal radiation effect on boundary layer flow of magneto-hydrodynamic (MHD) Jeffrey nanofluid across a moving plate with convective boundary condition. More physically acceptable model of passively controlled wall nanoparticle concentration is executed. Similarity transformation variables are utilised to transform the partial differential equations to non-linear ordinary differential equations. An effective Runge-Kutta Fehlberg Fourth-Fifth order (RKF45) method is employed to solve the obtained equations numerically. Validation of the present results has been made with the existing studies under the limiting cases and the results are found to be in a good agreement. Numerical solutions for several pertinent parameters are provided graphically over specified distributions. The results indicate that the temperature profile intensifies attributable to the increasing thermal radiation parameter. Besides, the increase of Brownian motion parameter pronounces negligible effect on the temperature profile, whereas nanoparticle concentration profile declines. Moreover, increment in the thermophoresis diffusion parameter results in the escalation of the temperature and nanoparticle concentration profiles.
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3

Mamatha, B., M. C. Raju, and S. V. K. Varma. "Thermal Diffusion Effect on MHD Mixed Convection Unsteady Flow of a Micro Polar Fluid Past a Semi-Infinite Vertical Porous Plate with Radiation and Mass Transfer." International Journal of Engineering Research in Africa 13 (December 2014): 21–37. http://dx.doi.org/10.4028/www.scientific.net/jera.13.21.

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The present study investigates the thermal diffusion and radiation effects on magneto hydro dynamic mixed convection flow of a micro polar fluid past an infinite, steadily moving porous plate with variable suction and constant viscosity. The equations of continuity, linear momentum, angular momentum, energy and diffusion, which govern the flow field, are solved by using a regular perturbation method. The behavior of the velocity, micro rotation, temperature, concentration, skin-friction, Nusselt number, and Sherwood number has been discussed for variations in the physical parameters with the help of the graphs.
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4

RASHIDI, MOHAMMAD MEHDI, and ESMAEEL ERFANI. "A NOVEL ANALYTICAL METHOD TO INVESTIGATE EFFECT OF RADIATION ON FLOW OF A MAGNETO-MICROPOLAR FLUID PAST A CONTINUOUSLY MOVING PLATE WITH SUCTION AND BLOWING." International Journal of Modeling, Simulation, and Scientific Computing 01, no. 02 (June 2010): 219–38. http://dx.doi.org/10.1142/s1793962310000146.

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In this article, Differential Transform Method (DTM) and Padé approximants (DTM-Padé), are considered for finding analytical solutions of a magneto-micropolar flow past a continuously moving plate with suction and blowing and radiation effect. This technique is extended to give solutions for system of nonlinear ordinary differential equations with boundary conditions at infinity. The analytic solutions of the system of nonlinear ordinary differential equations are constructed in the ratio of two polynomials. Graphical results are presented to investigate influence of the radiation parameter, magnetic field parameter, Prandtl number, coupling constant parameter and the surface mass transfer parameter on velocity profiles, angular velocity profiles and temperature profiles. In addition, the numerical method is used to investigate the validity of this analytical method, an excellent agreement is observed between the solutions obtained from the DTM-Padé and numerical results. The results reveal that the DTM-Padé is very effective and convenient for solving engineering problems especially for boundary-layer problems.
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5

Zigta, Binyam. "Thermal Radiation, Chemical Reaction and Viscous Dissipation Effects on Unsteady MHD Flow of Viscoelastic Fluid Embedded in a Porous Medium." Budapest International Research in Exact Sciences (BirEx) Journal 1, no. 3 (July 27, 2019): 35–57. http://dx.doi.org/10.33258/birex.v1i3.346.

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In this paper the effect of unsteady, incompressible, magneto hydrodynamics filled with electrically conducting viscoelastic fluid in an infinite vertical Couette porous channel wall embedded in a porous medium is analyzed. A uniform magnetic field is applied perpendicular to the channel wall. The temperature of the moving channel wall varies periodically and the temperature difference between the two infinite vertical channel walls is high due to thermal radiation. The Eckert number is the ratio of the kinetic energy of the flow to the temperature difference of the channel walls. The solution of the governing equations is obtained using regular perturbation techniques. These techniques are used to transform partial differential equations that are difficult to solve in closed form. These equations are reduced to a set of ordinary differential equations in dimensionless form so can be solved analytically. The effects of physical parameters Viz. Hartmann number, Viscoelastic parameter, Eckert number, Permeability of porous medium, Chemical reaction parameter, thermal Grashof number for heat transfer, modified Grashof number for mass transfer, frequency parameter and Schmidt number on flow parameters Viz., velocity, temperature and concentration has been discussed and shown graphically. The theoretical results have been supported by MATLAB code simulation study. The results show that velocity decreases with increasing values of frequency, Hartmann number and viscoelastic parameter but reverse effect is observed with temperature, thermal Grashof number, modified Grashof number and permeability of porous medium. Furthermore, The result shows that an increment in both thermal radiation parameter and Eckert number results in decrement of temperature near the moving porous channel wall while it approaches to a zero in the region close to the boundary layer of the stationary channel wall,. An increment in both chemical reaction and Schmidt number results in decreasing concentration. The velocity of fluid increases as Grashof number and modified Grashof number increases.
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6

Zigta, B., and P. R. Koya. "The Effect of MHD on Free Convection with Periodic Temperature and Concentration in the Presence of Thermal Radiation and Chemical Reaction." International Journal of Applied Mechanics and Engineering 22, no. 4 (December 20, 2017): 1059–73. http://dx.doi.org/10.1515/ijame-2017-0068.

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Abstract This paper studies the effect of magneto hydrodynamics on unsteady free convection between a pair of infinite vertical Couette plates. The temperature of the plates and concentration between the plates vary with time. Convection between the plates is considered in the presence of thermal radiation and chemical reaction. The solution is obtained using perturbation techniques. These techniques are used to transform nonlinear coupled partial differential equations to a system of ordinary differential equations. The resulting equations are solved analytically. The solution is expressed in terms of power series with some small parameter. The effect of various parameters, viz., velocity, temperature and concentration, has been discussed. Mat lab code simulation study is carried out to support the theoretical results. The result shows that as the thermal radiation parameter R increases, the temperature decreases near the moving porous plate while it approaches to a zero in the region close to the boundary layer of the stationary plate. Moreover, as the modified Grashof number, i.e., based on concentration difference, increases, the velocity of the fluid flow increases hence the concentration decreases. An increase in both the chemical reaction parameter and Schmidt number results in decreased concentration.
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7

Seddeek, M. A., S. N. Odda, M. Y. Akl, and M. S. Abdelmeguid. "Analytical solution for the effect of radiation on flow of a magneto-micropolar fluid past a continuously moving plate with suction and blowing." Computational Materials Science 45, no. 2 (April 2009): 423–28. http://dx.doi.org/10.1016/j.commatsci.2008.11.001.

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8

Zaginaylov, Gennadiy I., Yuri V. Gandel, and Petr V. Turbin. "Modeling of plasma effect on the diffraction radiation of relativistic beam moving over a grating of finite extent." Microwave and Optical Technology Letters 16, no. 1 (September 1997): 50–54. http://dx.doi.org/10.1002/(sici)1098-2760(199709)16:1<50::aid-mop16>3.0.co;2-8.

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9

Shur, Michael S., and Victor Ryzhii. "Plasma Wave Electronics." International Journal of High Speed Electronics and Systems 13, no. 02 (June 2003): 575–600. http://dx.doi.org/10.1142/s0129156403001831.

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Plasma waves are oscillations of electron density in time and space. In deep submicron field effect transistors plasma wave frequencies lie in the terahertz range and can be tuned by applied gate bias. Since the plasma wave frequency is much larger that the inverse electron transit time in the device, it is easier to reach "ballistic" regimes for plasma waves than for electrons moving with drift velocities. In the ballistic regime, no collisions of electrons with impurities or lattice vibrations occur on a time scale on the order of the plasma oscillation period, and the device channel acts as a resonant cavity for the plasma waves, making possible tunable resonant detection or even emission of the electromagnetic radiation in the terahertz range. We review the theory of plasma waves in field effect transistors; discuss instabilities of these waves in different device structures and their applications for detection and generation of the terahertz radiation.
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10

Golenkov, A. G., A. V. Shevchik-Shekera, M. Yu Kovbasa, I. O. Lysiuk, M. V. Vuichyk, S. V. Korinets, S. G. Bunchuk, S. E. Dukhnin, V. P. Reva, and F. F. Sizov. "THz linear array scanner in application to the real-time imaging and convolutional neural network recognition." Semiconductor Physics, Quantum Electronics and Optoelectronics 24, no. 1 (March 9, 2021): 90–99. http://dx.doi.org/10.15407/spqeo24.01.090.

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Room temperature linear arrays (up to 160 detectors in array) from silicon metal- oxide-semiconductor field-effect transistors (Si-MOSFETs) have been designed for sub- THz (radiation frequency 140 GHz) close to real-time direct detection operation scanner to be used for detection and recognition of hidden objects. For this scanner, the optical system with aspherical lenses has been designed and manufactured. To estimate the quality of optical system and its resolution, the system modulation transfer function was applied. The scanner can perform real-time imaging with the spatial resolution better than 5 mm at the radiation frequency 140 GHz and contrast 0.5 for the moving object speed up to 200 mm/s and the depth of field 20 mm. The average dynamic range of real time imaging system with 160-detector linear array is close to 35 dB, when the sources with the output radiation power of 23 mW (IMPATT diodes) are used (scan speed 200 mm/s). For the system with 32-detector array, the dynamic range was about 48 dB and for the single-detector system with raster scanning 80 dB with lock-in amplifier. However, in the latter case for obtaining the image with the sizes 20×40 mm and step of 1 mm, the average scanning time close to 15 min is needed. Convolutional neural network was exploited for automatic detection and recognition of hidden items.
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11

Ahmad, Salman, Muhammad Ijaz Khan, Tasawar Hayat, Muhammad Waqas, and Ahmed Alsaedi. "Irreversibility in two-dimensional magneto-nanomaterial flow of Jeffrey fluid with Arrhenius activation energy." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 12 (December 2, 2019): 4485–506. http://dx.doi.org/10.1108/hff-12-2018-0805.

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Purpose The purpose of this paper is to study entropy generation in magneto-Jeffrey nanomaterial flow by impermeable moving boundary. Adopted nanomaterial model accounts Brownian and thermophoretic diffusions. Modeling is arranged for thermal radiation, nonlinear convection and viscous dissipation. In addition, the concept of Arrhenius activation energy associated with chemical reaction are introduced for description of mass transportation. Design/methodology/approach Homotopy algorithms are used to compute the system of ordinary differential equations. Findings The afore-stated analysis clearly notes that simultaneous aspects of activation energy and entropy generation are not yet investigated. Therefore, the intention here is to consider such effects to formulate and investigate the magneto-Jeffrey nanoliquid flow by impermeable moving surface. Originality/value As per the authors’ knowledge, no such work has yet been published in the literature.
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12

Wu, X. L., W. M. Yang, S. H. Zhu, J. Z. Guo, T. N. Lu, and J. L. Pei. "Effect of Magnet Moving Speed on the Relaxation Rate of the Levitation Force for YBCO Bulk." Materials Science Forum 546-549 (May 2007): 2103–6. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2103.

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The effect of magnet moving speed on the relaxation of the maximum levitation force of YBCO bulk has been investigated. The experiment was carried out between a cylinder permanent magnet and a single-domain YBCO bulk, and the levitation force was measured using a self-made levitation force measurement system. It is found that the levitation force decreases with time after the gap distance between the magnet and YBCO bulk reduced to 2 mm and kept for the test. It is also found that the levitation force and its relaxation rate is different for different moving speed between the magnet and the YBCO bulk, and the higher the moving speed, the greater the relaxation rate of levitation force. However, the largest levitation force is obtained at an optimal speed, the higher the levitation force, and the faster the relaxation of levitation force.
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13

Pal, D. R., and MA Samad. "Combined Effects of Viscous Dissipation and Thermal Radiation on non-Newtonian FluidAlong a Surface with Heat Generation and Uniform Surface Heat Flux." Dhaka University Journal of Science 63, no. 2 (August 20, 2015): 97–104. http://dx.doi.org/10.3329/dujs.v63i2.24443.

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The paper analyses the effects of Magneto-hydrodynamic (MHD) free convective heat and mass transfer flow on non-Newtonian power law fluids along a continuously moving stretching sheet with radiation, heat generation and viscous dissipation under the simultaneous action of suction, thermal radiation, heat source, uniform transverse magnetic field and viscous dissipation. The governing non-linear partial differential equations describing the flow fields under consideration are transformed into non-linear ordinary differential equations by using appropriate analysis of similarity and then solved the resulting problem numerically by applying Nachtsheim-Swigert shooting iterative technique along with sixth order Runge-Kutta integration scheme. The computational results of the skin friction coefficient (Cf) the rate of heat transfer namely the local Nusselt number (Nux) and the mass transfer coefficient namely the local Sherwood number (Shx) have also been presented in tabular form. In the present study, a comparison has also been done with a published article and found a good agreement.Dhaka Univ. J. Sci. 63(2):97-104, 2015 (July)
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14

Fazal, Imran, Mohd Noh Karsiti, K. S. Rama Rao, and Saiful Azrin Zulkifli. "Modeling and Simulation of Moving Iron Linear Generator (MILG)." Applied Mechanics and Materials 110-116 (October 2011): 2464–68. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2464.

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Moving permanent magnet linear generator has some limitations such as thermal and impact force demagnetization, and complex control strategies. To overcome these limitations one of the solution is moving iron linear generators. This paper presents the analysis of flux using FEM for moving iron linear generator. The flux density varies with peak value of 0.85 for 6/1, 0.98 for 6/2 and 1.27 for 6/4 MILGs with the movement of translator. The effect of air gap on different MILGs is studied. The FEM analysis indicates that air gap have direct impact on output of the generator. The analysis is performed to replace the moving permanent magnet by moving iron in a different applications.
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15

Vijayalakshmi, A. R., and B. Kanimozhi. "Hall, Magneto Hydrodynamic and Radiation Effects on Rotating Fluid Past a Moving Vertical Plate with Mass Diffusion." Journal of Computational and Theoretical Nanoscience 14, no. 12 (December 1, 2017): 5761–69. http://dx.doi.org/10.1166/jctn.2017.7010.

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16

Zhu, S. H., W. M. Yang, X. L. Wu, J. Z. Guo, T. N. Lu, and S. B. Xi. "Effect of the Moving Speed between Magnet and Superconductor on the Levitation Force of Single-Domain YBCO Bulk." Materials Science Forum 546-549 (May 2007): 2107–10. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2107.

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The effect of the moving speed between a permanent magnet and a superconductor on the levitation force of single-domain YBCO bulk has been studied at liquid nitrogen temperature. It is found that the levitation force is much different with different moving speed, the maximum levitation force and the stiffness of the force-distance curve are increasing first and then decreasing with the increasing of the moving speed and, there is a reasonable speed to get the maximum levitation force. It is also found that the maximum attractive force is decreasing with the increasing of the moving speed.
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17

Faizan Ahmed, Muhammad, A. Zaib, Farhan Ali, Omar T. Bafakeeh, El Sayed Mohamed Tag-ElDin, Kamel Guedri, Samia Elattar, and Muhammad Ijaz Khan. "Numerical Computation for Gyrotactic Microorganisms in MHD Radiative Eyring–Powell Nanomaterial Flow by a Static/Moving Wedge with Darcy–Forchheimer Relation." Micromachines 13, no. 10 (October 18, 2022): 1768. http://dx.doi.org/10.3390/mi13101768.

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The intention of this study is to carry out a numerical investigation of time-dependent magneto-hydro-dynamics (MHD) Eyring–Powell liquid by taking a moving/static wedge with Darcy-Forchheimer relation. Thermal radiation was taken into account for upcoming solar radiation, and the idea of bioconvection is also considered for regulating the unsystematic exertion of floating nanoparticles. The novel idea of this work was to stabilized nanoparticles through the bioconvection phenomena. Brownian motion and thermophoresis effects are combined in the most current revision of the nanofluid model. Fluid viscosity and thermal conductivity that depend on temperature are predominant. The extremely nonlinear system of equations comprising partial differential equations (PDEs) with the boundary conditions are converted into ordinary differential equations (ODEs) through an appropriate suitable approach. The reformed equations are then operated numerically with the use of the well-known Lobatto IIIa formula. The variations of different variables on velocity, concentration, temperature and motile microorganism graphs are discussed as well as force friction, the Nusselt, Sherwood, and the motile density organism numbers. It is observed that Forchheimer number decline the velocity field in the case of static and moving wedge. Furthermore, the motile density profiles are deprecated by higher values of the bio convective Lewis number and Peclet number. Current results have been related to the literature indicated aforementioned and are found to be great achievement.
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18

Osipov, V. V., V. V. Lisenkov, V. A. Shitov, and K. E. Luk'yashin. "Effects of laser radiation on immobile and fast-moving targets." Quantum Electronics 39, no. 4 (April 30, 2009): 321–27. http://dx.doi.org/10.1070/qe2009v039n04abeh013964.

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19

Ginzburg, Vitalii L. "Radiation by uniformly moving sources (Vavilov-Cherenkov effect, transition radiation, and other phenomena)." Uspekhi Fizicheskih Nauk 166, no. 10 (1996): 1033. http://dx.doi.org/10.3367/ufnr.0166.199610b.1033.

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20

Ginzburg, Vitalii L. "Radiation by uniformly moving sources (Vavilov–Cherenkov effect, transition radiation, and other phenomena)." Physics-Uspekhi 39, no. 10 (October 31, 1996): 973–82. http://dx.doi.org/10.1070/pu1996v039n10abeh000171.

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21

Reddy, Thummala Sankar, Parakapali Roja, Shaik Mohammed Ibrahim, and Giulio Lorenzini. "Thermal Radiation and Viscous Dissipation Effects on (MHD) Bioconvection Stream of Maxwell Nanoliquid over a Permeable Vertical Plate Due to Gyrotactic Microorganisms." Mathematical Modelling of Engineering Problems 9, no. 2 (April 28, 2022): 325–35. http://dx.doi.org/10.18280/mmep.090205.

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This manuscript deliberates on thermal radiation and viscous dissipation possessions on magneto-hydrodynamic (MHD) bioconvection stream of a new variety of water established the upper-convected Maxwell, Nanoliquid covering Nanoparticles and motile gyrotactic microorganisms over an absorptive vertical moving plate. Nanoliquid bio convective is developed through the mutual possessions of buoyant forces and magnetic field on the collaboration of motile microorganisms and Nanoparticles. The leading nonlinear PDE of the problem are transforming into a structure of nonlinear ODE over suitable similarity conversion and shooting method procedure joined with Runge–Kutta–Fehlberg integration pattern, the exemplary BVP is attempted numerically. A parametric investigation of the complete stream regime is supported out to demonstrate the possessions of the leading constraints, specifically bioconvection Lewis quantity Lb, traditional Lewis quantity Le, bioconvection Peclet quantity Pe, buoyancy quotient constraint Nr, bioconvection Rayleigh quantity Rb, Brownian motion constraint Nb, thermophoresis constraint Nt, Hartmann quantity Ha, Grashof quantity Gr, radiation constraint R Eckert quantity Ec, microorganisms concentration variance constraint Ω and a suction/injection constraint fw on the flow, temperature, volume fraction of nanoparticles and motile microorganisms density outlines as well as the friction quantity, the local Nusselt quantity, the local Sherwood quantity and the local density quantity of the motile microorganisms.
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22

Horsley, S. A. R., M. Artoni, and G. C. La Rocca. "Radiation pressure on a moving body: beyond the Doppler effect." Journal of the Optical Society of America B 29, no. 11 (October 24, 2012): 3136. http://dx.doi.org/10.1364/josab.29.003136.

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23

Ginzburg, V. L. "Radiation from Uniformly Moving Sources (Vavilov–Cherenkov Effect, Transition Radiation, and Some Other Phenomena)." Acoustical Physics 51, no. 1 (2005): 11. http://dx.doi.org/10.1134/1.1851624.

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24

Chu, Yu-Ming, M. Ijaz Khan, M. Israr Ur Rehman, Seifedine Kadry, and M. K. Nayak. "Flow and thermal management of MHD Cross nanofluids over a thin needle with auto catalysis chemical reactions." International Journal of Modern Physics B 34, no. 30 (October 28, 2020): 2050287. http://dx.doi.org/10.1142/s0217979220502872.

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This research work concerns the investigation of electrically conducting stagnation point flow, heat and mass transport of magneto-Cross nanofluids towards a moving and stretched surface of thin needle. The Buongiorno nanofluid model is incorporated to model the governing expressions. The flow is conducted electrically and generated through stretching impact. Internal diffusion of particle, homogenous–heterogeneous reactions and radiative heat flux effects are utilized to examine the behavior of heat and mass transport on the surface of thin needle. Suitable similarity variables and boundary layer approximations are used to turn into dimensionless one. After that, numerical outcomes are computed by a Shooting method (bvp4c) package in MATLAB. The incentives of sundry relevant parameters on the flow field, skin friction coefficient, heat transfer rate, temperature field and concentration distribution are portrayed via graphical tactic and have been elucidated in detail. The outcomes indicate that the temperature distribution is more versus rising values of radiative heat flux, magnetic parameter and Eckert number.
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25

Fei, Teng, and Hai Tao Yu. "The Design of a Moving-Magnet Linear Oscillating Motor for Linear Compressors." Applied Mechanics and Materials 416-417 (September 2013): 433–38. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.433.

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The fundamental theory and simplified model of moving-magnet 1inear oscillating motor are presented in this paper. Based on the analysis of the equivalent magnetic and electric circuit model, a 2D finite element (FE) model of a linear oscillating motor with two separated stators is established. Through the FE simulation, the effect of the input voltage on the electric-magnetic force and displacement is investigated. The efficiency of the motor is estimated according to the analysis.
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26

MUBDIR, Bilal A. "EFFECT OF MOVING AVERAGE FILTER WITH PID CONTROLLER USING HIL TECHNIQUE." MINAR International Journal of Applied Sciences and Technology 03, no. 03 (September 1, 2021): 111–23. http://dx.doi.org/10.47832/2717-8234.3-3.14.

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Designing fast response controller that can achieving steady state with minimum error is big challenge in control application. Proportional Integral Derivate (PID) controllers are conventional controllers for their simplicity and wide range of applications in industrial. Many efforts have been made in improving the PID controller performance by enhancing the controller with different techniques for tuning its operation or filtering the feedback signal. In this paper, the effect of using Moving Average filter with the PID controller for controlling the speed of Permanent Magnet DC (PMDC) Motor with noisy speed sensor is discussed. PID controller and the moving average filter are modeled in MATLAB/Simulink software, where the Hardware in the Loop (HIL) technique with aid of microcontroller was used for the controlled plant which is a PMDC motor in this study. Comprehensive study on the available techniques used to modeling the PID controller is done as well. Furthermore, full practical tests prove that the controller behavior is more stable when moving average filter used and its effect minimized time needed to reach the steady state point clearly by 76%.
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27

Ferfecki, Petr, Marek Konečný, Michal Molčan, and Jaroslav Zapoměl. "Numerical Simulation and Experimental Analysis of the Magnetic Damping Effect generated by a Moving Magnet." Manufacturing Technology 20, no. 6 (December 23, 2020): 714–19. http://dx.doi.org/10.21062/mft.2020.114.

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28

Haroun, Mohamed Hassan. "Electromagnetohydrodynamic peristaltic flow of a couple stress nanofluid through a vertical annulus in the presence of Hall currents and thermal radiation." International Journal of Applied Electromagnetics and Mechanics 68, no. 2 (February 22, 2022): 141–57. http://dx.doi.org/10.3233/jae-210051.

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This paper investigates the electric properties of gold nanoparticles mixed with a convection dielectric couple stress fluid inside a vertical cylindrical tube with moving endoscope in the presence of Hall currents and thermal radiation. Under the long wavelength approximation and the use of appropriate conversion relationships between fixed and moving frame coordinates, the exact solutions have been evaluated for temperature distribution, gold nanoparticles concentration, electrical potential function and nanofluid pressure, while analytical solution is found for the axial velocity using the homotopy analysis method. The results show that the presence of the electric field enhances the effects of Brownian motion parameter, thermophoresis parameter, radiation parameter, Hall currents and wave amplitude ratio on the axial nanofluid velocity, while it was found that its presence reduces the effects of couple stress parameter, thermophoresis diffusion constant and Brownian diffusion constant.
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29

Kelemenová, Tatiana, Ivana Koláriková, and Ondrej Benedik. "LINEAR SOLENOID ELECTROMAGNETIC ACTUATOR WITH DIFFERENTIAL SERIES WINDINGS." Acta Mechatronica 6, no. 4 (December 31, 2021): 57–61. http://dx.doi.org/10.22306/am.v6i4.80.

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A linear solenoid electromagnetic actuator is a device for creating a linear reciprocating motion with a force effect. It contains a moving part consisting of a permanent magnet in the housing, threaded spacers, threaded rods, nuts for adjusting the stroke of the actuator and the hanging eyes of the actuator. The device further comprises a non-moving part formed by the coil body, the left actuator coil winding, the right actuator coil winding and the actuator cover, the sense of winding the left actuator coil winding opposite.
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30

Margaritondo, Giorgio. "The simple physics of the bending magnet spectrum." Journal of Synchrotron Radiation 25, no. 4 (May 29, 2018): 1271–76. http://dx.doi.org/10.1107/s1600577518005441.

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A new elementary model of the bending magnet synchrotron radiation is presented, with minimal mathematical formalism. The model explains features not justified by other simplified approaches; in particular, it brings to light the key role of the directional Doppler effect.
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31

Cappelli, Luigi, Fabrizio Marignetti, Enzo de Santis, Yuri Coia, and Roberto di Stefano. "Design of a Moving-Coil Linear Generator for Marine Energy Conversion." Applied Mechanics and Materials 416-417 (September 2013): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.311.

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The Inertial Sea Wave Converter is a device that uses the effect of a gyroscope to convert wave energy into electric energy. It is equipped with two Linear Tubular Permanent Magnet Generators. This paper describes the design and optimization processes for a moving-coil linear generator to be installed on the Inertial Sea Wave Converter. FEM Analysis has been performed to validate the design and to optimize forces and generated power. A Power Factor Corrector has been developed as frontend electronics.
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32

Sangyong Kim, Myeong-Gyu Song, No-Cheol Park, Jeonghoon Yoo, Young-Pil Park, and Kyoung-Su Park. "Optimal Design of Moving-Magnet Type Actuators for Optical Disk Drives Considering Effect of Coil Electromagnet." IEEE Transactions on Magnetics 45, no. 5 (May 2009): 2228–31. http://dx.doi.org/10.1109/tmag.2009.2016164.

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33

Ahmedov, Haci, Beste Korutlu, Lev Dorosinskiy, Recep Orhan, and Ozlen Tuncel. "External Magnetic Field Measurements in UME Kibble Balance." ACTA IMEKO 9, no. 3 (September 30, 2020): 33. http://dx.doi.org/10.21014/acta_imeko.v9i3.780.

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The new definition of kilogram in terms of the fixed value of Planck constant ensures the long-term stability of SI mass unit and enables traceability from more than one source. Kibble balance experiments offer an effective primary realization method for the new definition of kilogram. Kibble Balance apparatus operating at National Metrology Institute of Turkey is designed with a stationary coil and an oscillating magnet. In contradistinction to traditional moving coil Kibble balance experiments, external magnetic field brings an asymmetry between the Ampere’s law of force and the Faraday’s law of induction in moving magnet experiments. In this paper, we develop a method based on the external magnetic flux density difference measurements in vertical direction to take into account the effect of the external magnetic field on the realization of kilogram. The proposed model in this approach fits well with the data such that the kilogram realization requirement is met within the accuracy of the measuring instrument.
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34

Thumma, Thirupathi, O. Anwar Beg, and Siva Reddy Sheri. "Finite element computation of transient dissipative double diffusive magneto-convective nanofluid flow from a rotating vertical porous surface in porous media." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 231, no. 2 (June 2017): 89–108. http://dx.doi.org/10.1177/2397791417712856.

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This article aimed to investigate the transient dissipative magnetohydrodynamic double diffusive free convective boundary layer flow of electrically conducting nanofluids from a stationary or moving vertical porous surface in a rotating high permeability porous medium, considering buoyancy, thermal radiation and first-order chemical reaction. Thermo-diffusion (Soret) and diffuso-thermo (Dufour) effects are also considered. Darcy’s law is employed. The mathematical model is formulated by considering water-based nanofluids containing metallic nano-particles for both stationary and moving plate cases. Three nanofluids are examined, namely copper, aluminium oxide or titanium oxide in water. The transformed non-linear, coupled, dimensionless partial differential equations describing the flow are solved with physically appropriate boundary conditions using Galerkin weighted residual scheme. For prescribed permeability, numerical results are presented graphically for the influence of a number of emerging parameters. Validation of finite element solutions for skin friction and Nusselt number is achieved via comparison with the previously published work as special cases of the present investigation and very good correlation obtained. Increasing rotational parameter is observed to reduce both primary and secondary velocity components. Primary and secondary velocities are consistently elevated with increasing Soret, Dufour, thermal Grashof and solutal Grashof numbers. Increasing Schmidt number, chemical reaction and suction parameter both suppress nano-particle concentration whereas the converse behavior is computed with increasing Soret number. The study is relevant to high-temperature rotating chemical engineering systems exploiting magnetized nanofluids and also electromagnetic nanomaterial manufacturing processes.
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35

NAKAMURA, GEN, and KAZUHIRO YAMAMOTO. "QUANTUM LARMOR RADIATION FROM A MOVING CHARGE IN AN ELECTROMAGNETIC PLANE WAVE BACKGROUND." International Journal of Modern Physics A 27, no. 24 (September 28, 2012): 1250142. http://dx.doi.org/10.1142/s0217751x12501424.

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We extend our previous work [Phys. Rev. D83, 045030 (2011)], which investigated the first-order quantum effect in the Larmor radiation from a moving charge in a spatially homogeneous time-dependent electric field. Specifically, we investigate the quantum Larmor radiation from a moving charge in a monochromatic electromagnetic plane wave background based on the scalar quantum electrodynamics at the lowest order of the perturbation theory. Using the in–in formalism, we derive the theoretical formula of the total radiation energy from a charged particle in the initial states being at rest and being in a relativistic motion. Expanding the theoretical formula in terms of the Planck constant ℏ, we obtain the first-order quantum effect on the Larmor radiation. The quantum effect generally suppresses the total radiation energy compared with the prediction of the classical Larmor formula, which is a contrast to the previous work. The reason is explained by the fact that the radiation from a moving charge in a monochromatic electromagnetic plane wave is expressed in terms of the inelastic collisions between an electron and photons of the background electromagnetic waves.
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36

Gaunaurd, G. C., and T. J. Eisler. "Classical Electrodynamics and Acoustics: Sound Radiation by Moving Multipoles." Journal of Vibration and Acoustics 119, no. 2 (April 1, 1997): 271–82. http://dx.doi.org/10.1115/1.2889714.

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In classical electrodynamics (CED) P. Dirac used the average of retarded and advanced fields to represent the bound field and their difference to represent the free field in his derivation of the (Lorentz-Dirac) equation of motion for an electron. The latter skew-symmetric combination filtered out the radiation part of the field. It can also be used to derive many properties of the power radiated by acoustic sources, such as angular and frequency distributions. As in CED there is radiation due to source acceleration and radiation patterns exhibit the “headlight effect.” Power radiation patterns are obtained by this approach for point multipoles undergoing various motions. Applications to sound radiation problems from rotating machinery are shown. Numerous computed plots illustrate all cases.
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37

Asano, Yoshihiro. "Shielding design calculation for SPring-8 beamlines using STAC8." Journal of Synchrotron Radiation 5, no. 3 (May 1, 1998): 615–17. http://dx.doi.org/10.1107/s0909049597019249.

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The beamlines of SPring-8 are classified by synchrotron radiation source into undulator, wiggler and bending-magnet beamlines for safety analysis. The shielding design calculations for synchrotron radiation are performed with a new shielding design code, STAC8, taking into consideration the linear-polarization effect, the slant length of the shield hutch wall and the build-up effect as functions of scattering angle and azimuthal angle.
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38

Gadalla, Mohamed, Mehdi Ghommem, George Bourantas, and Karol Miller. "Modeling and Thermal Analysis of a Moving Spacecraft Subject to Solar Radiation Effect." Processes 7, no. 11 (November 4, 2019): 807. http://dx.doi.org/10.3390/pr7110807.

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The impact of solar radiation on spacecraft can increase the cooling load, degrade the material properties of the structure and possibly lead to catastrophic failure of their missions. In this paper, we develop a computational model to investigate the effect of the exposure to solar radiation on the thermal distribution of a spacecraft with a cylindrical shape which is traveling in low earth orbit environment. This is obtained by the energy conservation between the heat conduction among the spacecraft, the heating from the solar radiation, and the radiative heat dissipation into the surroundings while accounting for the dynamics of the space vehicle (rotational motion). The model is solved numerically using the meshless collocation point method to evaluate the temperature variations under different operating conditions. The meshless method is based on approximating the unknown field function and their space derivatives, by using a set of nodes, sprinkled over the spatial domain of the spacecraft wall and functions with compact support. Meshless schemes bypass the use of conventional mesh configurations and require only clouds of points, without any prior knowledge on their connectivity. This would relieve the computational burden associated with mesh generation. The simulation results are found in good agreement with those reported in previously-published research works. The numerical results show that spinning the spacecraft at appropriate rates ensures low and uniform temperature distribution on the spacecraft, treated as thick-walled object of different geometries. Therefore, this would extend its lifetime and protect all on-board electronic equipment needed to accomplish its mission.
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39

Islam, S. H., and N. Ahmed. "EFFECT OF RADIATION ON CONVECTIVE MHD FLOW PAST A MOVING VERTICAL POROUS PLATE." Advances and Applications in Fluid Mechanics 20, no. 3 (July 26, 2017): 363–74. http://dx.doi.org/10.17654/fm020030363.

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40

BINI, DONATO, and ANDREA GERALICO. "EQUILIBRIUM ORBITS OF PARTICLES UNDERGOING POYNTING-ROBERTSON EFFECT IN SCHWARZSCHILD SPACETIME." International Journal of Modern Physics: Conference Series 12 (January 2012): 247–55. http://dx.doi.org/10.1142/s2010194512006447.

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Equilibrium orbits of particles moving on the equatorial plane of a Schwarzschild spacetime are investigated when a test radiation field is superposed to the background gravitational field. The radiation flux is endowed with a fixed but arbitrary (non-zero) angular momentum. It is found that multiple equilibrium circular orbit exist provided that the photon angular momentum is sufficiently high. The stability of such orbits is also analyzed.
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41

Cohen, Aina E., Paul J. Ellis, Mitchell D. Miller, Ashley M. Deacon, and R. Paul Phizackerley. "An automated system to mount cryo-cooled protein crystals on a synchrotron beamline, using compact sample cassettes and a small-scale robot." Journal of Applied Crystallography 35, no. 6 (November 13, 2002): 720–26. http://dx.doi.org/10.1107/s0021889802016709.

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An automated system for mounting and dismounting pre-frozen crystals has been implemented at the Stanford Synchrotron Radiation Laboratory (SSRL). It is based on a small industrial robot and compact cylindrical cassettes, each holding up to 96 crystals mounted on Hampton Research sample pins. For easy shipping and storage, the cassette fits inside several popular dry-shippers and long-term storage Dewars. A dispensing Dewar holds up to three cassettes in liquid nitrogen adjacent to the beamline goniometer. The robot uses a permanent magnet tool to extract samples from, and insert samples into a cassette, and a cryo-tong tool to transfer them to and from the beamline goniometer. The system is simple, with few moving parts, reliable in operation and convenient to use.
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42

Rubino, Edoardo, and Tindaro Ioppolo. "A Vibrometer Based on Magnetorheological Optical Resonators." Vibration 1, no. 2 (October 17, 2018): 239–49. http://dx.doi.org/10.3390/vibration1020017.

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This paper addresses the feasibility of an optical vibrometer that is based on the shift of the optical modes, also known as whispering gallery modes (WGMs), of a magnetorheological optical resonator. The optical resonator that is used in this study is fabricated by mixing polyvinyl chloride plastisol with magnetically polarizable particles. When a permanent magnet that is located nearby the optical resonator is moved, it induces a perturbation of the morphology of the resonator, due to the magnetostrictive effect. This change in the morphology induces a shift in the optical modes of the resonator. The shift of the optical modes can be related to the displacement of the permanent magnet. The proposed sensor concept is based on monitoring the displacement of a tiny magnet that is attached to a moving surface. The optical quality factor of the resonator used in these studies was of the order of 106. The experimental results show a sensitivity of 0.32 pm/μm and a resolution that is less than 300 nm.
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43

Sharma, Rohit, Syed Modassir Hussain, Hitesh Joshi, and Gauri Shenkar Seth. "Analysis of Radiative Magneto-Nanofluid over an Accelerated Plate in a Rotating Medium with Hall Effects." Diffusion Foundations 11 (August 2017): 129–45. http://dx.doi.org/10.4028/www.scientific.net/df.11.129.

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Present research work has been undertaken to analyze the effects of Hall current on natural convective flow of radiative, incompressible, viscous and electrically conducting magneto-nanofluid over a uniformly accelerated moving vertical ramped temperature plate in a rotating medium. Three types of water based nanofluids containing the nanoparticles of alumina, copper and titanium oxide have been accounted. The mathematical model of the problem has been presented using the nanoparticle volume fraction model. The Laplace transform technique has been employed to solve the mathematical model. The closed-form expressions of nanofluid velocity, temperature, shear stress and rate of heat transfer at the plate have been obtained for both the conditions of ramped temperature and isothermal plates. The effects of various physical parameters on the nanofluid velocity due to primary and secondary flows and temperature have been exemplified using various graphs whereas, the numerical values of shear stress and rate of heat transfer at the plate have been reported in tabular form for different values of physical parameters of interest. Moreover, the numerical results have been compared for the natural convective flow near ramped temperature plate with the corresponding flow near isothermal plate. It has been noted that both the nanofluid velocity and temperature are higher in magnitude in the case of isothermal plate than that of ramped temperature plate. The results of present research work have been validated with the earlier published work.
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44

Arafa, W., H. Badran, and H. El-Samman. "Effect of moving air and variable radon concentration on the response of charcoal canister." Radiation Measurements 40, no. 2-6 (November 2005): 662–65. http://dx.doi.org/10.1016/j.radmeas.2005.02.021.

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45

YAMANE, Kosho, Yoshihisa TAKAYAMA, Shinya KIJIMOTO, and Satoshi ISHIKAWA. "Modeling of magnetic damper composed of ring magnet and coaxially and relatively moving conducting disk considering skin effect." Transactions of the JSME (in Japanese) 82, no. 837 (2016): 15–00659. http://dx.doi.org/10.1299/transjsme.15-00659.

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46

Vittek, Ján, Vladimir Vavrús, Jozef Buday, and Jozef Kuchta. "Forced dynamics control of an actuator with linear PMSM." Facta universitatis - series: Electronics and Energetics 22, no. 2 (2009): 183–95. http://dx.doi.org/10.2298/fuee0902183v.

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The paper presents design and verification of Forced Dynamics Control of an actuator with linear permanent magnet synchronous motor. This control method is a relatively new one and offers an accurate realization of a dynamic speed response, which can be selected for given application by the user. In addition to this, the angle between stator current vector and moving part flux vector is maintained mutually perpendicular as it is under conventional vector control. To achieve prescribed speed response derived control law requires estimation of an external force, which is obtained from the set of observers. The first observer works in pseudo-sliding mode and observes speed of moving part while the second one has filtering effect for elimination of the previous one chattering. The overall control system is verified by simulations and experimentally. Preliminary experiments confirmed that the moving part speed response follows the prescribed one fairly closely.
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47

Liu, Z. S., Z. W. Fang, and X. X. Li. "Design of permanent magnet synchronous generator and anti-electromagnetic interference research." Journal of Physics: Conference Series 2345, no. 1 (September 1, 2022): 012008. http://dx.doi.org/10.1088/1742-6596/2345/1/012008.

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Abstract Compared with the electric excitation synchronous generator, permanent magnet synchronous generator (PMSG) use permanent magnet excitation to replace electric field winding, which can simplify the motor structure and also reduce the motor weight and loss, improve the efficiency and the reliability of the motor. And it also eliminates the excitation loss. Permanent magnet synchronous generator (PMSG) has many advantages such as wide load range, strong overload capacity and obvious energy saving effect. Based on Motor design software, Motor-Cad, a permanent magnet synchronous generator (PMSG) was optimum designed in this paper it can be used as an independent backup power source for daily life, business, engineering construction site, emergency rescue and emergency treatment, and the establishment of its structure, performance parameter and mathematical model were studied. At the same time, how to improve the capacity of permanent magnet generator against electromagnetic radiation interference is also a problem considered. Therefore, a current switching device is designed in the control system to prevent electromagnetic pulse damage to the permanent magnet generator. The performance simulation verifies that the permanent magnet synchronous generator designed in this paper meets the design requirements completely.
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48

de Hoop, Adrianus T. "Electromagnetic radiation from moving, pulsed source distributions: The 3D time-domain relativistic Doppler effect." Wave Motion 46, no. 1 (January 2009): 74–77. http://dx.doi.org/10.1016/j.wavemoti.2008.08.003.

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49

SAA, ALBERTO, and MARCELO SCHIFFER. "THE GRAVITATIONAL VAVILOV–CHERENKOV EFFECT." Modern Physics Letters A 13, no. 19 (June 21, 1998): 1557–64. http://dx.doi.org/10.1142/s0217732398001637.

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In this letter we show that an uncharged black hole moving superluminally in a transparent dielectric medium violates Hawking's area theorem. The violation can be overcome through the emission of radiation. Since modes cannot emerge from the black hole itself, this radiation must originate from a collective effect in the medium, in complete analogy with the Vavilov–Cherenkov effect. However, because the black hole is uncharged, the emission mechanism must be different. We discuss the physical origin of the effect and obtain a Newtonian estimation. Then we obtain the appropriate equations in the relativistic case and show that the field which is radiated away is a combination of gravitational and electromagnetic degrees of freedom. Possible astrophysical relevance for the detection of primordial black holes and binary systems is discussed.
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50

Wang, Jian, Li Wang, Yiyong Liu, and Wei Zhang. "Effect Analyses of Thermal Deformation on Magnetic Performance of the CPMU Prototype in SSRF." IOP Conference Series: Materials Science and Engineering 1240, no. 1 (May 1, 2022): 012144. http://dx.doi.org/10.1088/1757-899x/1240/1/012144.

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Abstract A cryogenic permanent magnet undulator (CPMU) prototype cooled by sub-cooled liquid nitrogen was developed in Shanghai Synchrotron Radiation Facility (SSRF) in 2016. The CPMU prototype mainly consist of NdFeB based hybrid magnet arrays with a period of 20 mm and a magnetic length of 1.6 m, a pair of girders to support the magnetic arrays, parallel SLN2 cooling loops attached to the girders, thermal spacers connecting the girders and the copper LN2 tubes, electric heaters to heat the girders and regulate the magnet working temperature at around 120 K, and stems made of stainless steel to support the girders. During the first magnetic field measurement, the RMS phase error of the CPMU prototype changed from 3.2 degree at room temperature to 4.5 degree at 135 K. By shimming the magnetic field, its RMS phase error is reduced to 3.5 at low temperature finally. This paper presents detailed analyses of temperature distribution and thermal deformation along the CPMU girder during cool down process. By comparison with test results, the deterioration of the RMS phase error is well explained. The analyses can provide guidance for magnetic field shimming and avoid or reduce the deterioration of the RMS phase error at low temperature.
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