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Journal articles on the topic 'Flat spiral coil'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Luca, Dorin, Cristina Biriş, and Dorian Luca. "Electromagnetic Forming Analysis of the Al 99.0 Sheet with Tools of Different Configurations." MATEC Web of Conferences 290 (2019): 03010. http://dx.doi.org/10.1051/matecconf/201929003010.

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Electromagnetic forming is an advanced manufacturing procedure, characterized by the fact that the tool carrying the deformation force does not touch the workpiece. This paper presents research regarding the electromagnetic forming of Al 99.0 (EN AW-1200) sheet with coils, having different configurations. The purpose of the research was to find the flat spiral coil configuration that ensures maximum deformation of the workpiece. Flat spiral coils with different gaps between the coil and the workpiece, and coils with different number of windings were tested. The influence of these parameters was monitored on the maximum strain of the free bulged parts. The analysis of the results obtained for different configurations of the flat spiral coils allowed the selection of the significant parameters that influenced the electromagnetic forming process of the Al 99.0 flat workpiece, which aimed to elaborate the mathematical model and to optimize the investigated process.

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2

Cui, Xiaohui, Dongyang Qiu, Lina Jiang, Hailiang Yu, Zhihao Du, and Ang Xiao. "Electromagnetic Sheet Forming by Uniform Pressure Using Flat Spiral Coil." Materials 12, no. 12 (June 18, 2019): 1963. http://dx.doi.org/10.3390/ma12121963.

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The coil is the most important component in electromagnetic forming. Two important questions in electromagnetic forming are how to obtain the desired magnetic force distribution on the sheet and increase the service life of the coil. A uniform pressure coil is widely used in sheet embossing, bulging, and welding. However, the coil is easy to break, and the manufacturing process is complex. In this paper, a new uniform-pressure coil with a planar structure was designed. A three-dimensional (3D) finite element model was established to analyze the effect of the main process parameters on magnetic force distribution. By comparing the experimental results, it was found that the simulation results have a higher analysis precision. Based on the simulation results, the resistivity of the die, spacing between the left and right parts of the coil, relative position between coil and sheet, and sheet width significantly affect the distribution of magnetic force. Compared with the structure and magnetic force on a traditional uniform pressure coil, the planar uniform pressure coil can produce a uniform magnetic force distribution on the sheet, reduce the manufacturing difficulty, reduce manufacturing cost, and enhance the service life for the coil.

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3

Liu, Xu, Chenyang Xia, and Xibo Yuan. "Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance." Energies 11, no. 11 (October 23, 2018): 2875. http://dx.doi.org/10.3390/en11112875.

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This paper analyses the relationship between the coil design parameters and the system performance, including power transfer efficiency and amount, when circular flat spiral coils are adopted in a wireless power transfer (WPT) system. Coil design variables including outer radius, inner radius, channel width and coil turns are thoroughly studied to improve the system performance with a limited maximum outer radius for practical purposes. A two-coil WPT system has been built to verify the analysis, and the experimental results show good consistency with the theoretical calculations and simulation results, which show that the coil design parameters have a significant impact on the system performance, even with the same coil size. In the experiments, the coil-to-coil distance is 150 mm, the maximum coil outer radius is limited in 300 mm, and the DC input voltage and the load resistance are 100 V and 5 Ω, respectively. When the coils are tightly-wound in the most traditional way to maximize the coil size, the coil-system efficiency is 62.6% with only 4.5 W load power. In contrast, the efficiency optimized coil can improve the coil-system efficiency to 91.2% with the outer radius stayed the same. Besides, when the power transfer efficiency and amount are considered simultaneously, the system can achieve 1279 W load power with 85.94% coil-system efficiency.

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4

Luo, Win-Jet, C. Bambang Dwi Kuncoro, Pratikto, and Yean-Der Kuan. "Single-Layer Transmitter Array Coil Pattern Evaluation toward a Uniform Vertical Magnetic Field Distribution." Energies 12, no. 21 (October 31, 2019): 4157. http://dx.doi.org/10.3390/en12214157.

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A uniform magnetic field distribution is a critical aspect in the transmitter array coil design process for achieving a homogenous vertical magnetic field distribution. The free position and orientation features can thus be implemented in the wireless power charging system. This paper presents vertical magnetic field distribution generated by a single-layer circular flat spiral air core transmitter array coil model analysis and evaluation using a numerical analysis method. This method is developed based on the off-symmetry axis magnetic field distribution due to a circular current loop derived from the Biot-Savart law. The proposed evaluation criteria are used to obtain the vertical magnetic field distribution characteristic of the evaluated array coil model. The vertical magnetic field distribution of several circular flat spiral air core coils, in both single and array coil models with different coil geometries were investigated to obtain the relation between the coil parameters and the distance between the adjoining coil centers to generate uniform vertical magnetic field distribution. A case study was also conducted to analyze and evaluate several array coil model patterns (1 × 2 array coil, 1 × 3 array coil, 2 × 2 array coil, 2 × 3 array coil) to meet uniform vertical magnetic field distribution. The array coil model is composed of an identical single circular flat spiral air-core coil. Every single coil has inner coil diameter (Di), outer coil diameter (Do), wire diameter (W), pitch (P) and a number of turns (N) at 25 mm, 47.8 mm, 0.643 mm, 0.03 mm, 17 respectively. The study and evaluation of several array coil pattern models show that the distance between the adjoining coil centers should be defined close to the half of coil outer diameter (1/2Do) to generate close to uniform vertical magnetic field distribution. The vertical magnetic field distribution average and magnetic field effective transmitting areas array coil model with the given coil parameters changing as the effect in variation in distances between the adjoining coil centers.

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5

Stevens, J. E., M. J. Sowa, and J. L. Cecchi. "Helicon plasma source excited by a flat spiral coil." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 13, no. 5 (September 1995): 2476–82. http://dx.doi.org/10.1116/1.579491.

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6

Akbar, S., M. A. Aleem, M. N. Sarwar, A. U. Zillohu, M. S. Awan, A. Haider, Z. Ahmad, S. Akhtar, and M. Farooque. "Electromagnetic flat sheet forming by spiral type actuator coil." IOP Conference Series: Materials Science and Engineering 146 (August 2016): 012054. http://dx.doi.org/10.1088/1757-899x/146/1/012054.

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7

Akbar, Shakeel, Muhammad Adeel Aleem, Faisal Pirandad, Ahnaf Usman Zillohu, Muhammad Saifullah Awan, Ali Haider, and Muhammad Farooque. "Strip Size Optimization for Spiral Type Actuator Coil Used in Electromagnetic Flat Sheet Forming Experiment." Key Engineering Materials 875 (February 2021): 35–41. http://dx.doi.org/10.4028/www.scientific.net/kem.875.35.

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Flat spiral coil for electromagnetic forming system has been modelled in FEMM 4.2 software. Copper strip was chosen as material for designing the actuator coil. Relationship between height to width ratio (S-factor) of the copper strip and coil’s performance has been studied. Magnetic field intensities, eddy currents and Lorentz force were calculated for the coils that were designed using six different 'S-factor' values (0.65, 0.75, 1.05, 1.25, 1.54 and 1.75), keeping the cross-sectional area of strip same. Results obtained through simulation suggest that actuator coil with S-factor ~ 1 shows optimum forming performance as it exerts maximum Lorentz force (84 kN) on work piece. The same coils was fabricated and used for electromagnetic sheet forming experiments. Aluminum 6061 sheets of thickness 1.5 mm have been formed using different voltage levels of capacitor bank. Smooth forming profiles were obtained with dome heights 28, 35 and 40 mm in work piece at 800, 1150 and 1250 V respectively.

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8

Blums, Juris, G. Terlecka, and Ausma Vilumsone. "The Electrodynamic Human Motion Energy Converter with Planar Structure." Advanced Materials Research 222 (April 2011): 36–39. http://dx.doi.org/10.4028/www.scientific.net/amr.222.36.

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The performance of the electrodynamic human motion energy converter with planar structure is under investigation. The electrodynamic converter consists of a flat, spiral-shaped coil and a rectangular magnet that during human motion moves in respect to one another. During the motion of the rectangular magnet with a remanence 0.1 T over a flat, formed up as an Archimedes spiral coil with 25 turns, an average power of about 10 W is generated. The generator elements can both be deployed on a variety of clothing items which move relative to one another during the human motion, and also realizing the forced oscillation of the magnet during walking.

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9

Liao, Yanhua, and Xueqing Yuan. "Compensation topology for flat spiral coil inductive power transfer systems." IET Power Electronics 8, no. 10 (October 2015): 1893–901. http://dx.doi.org/10.1049/iet-pel.2014.0589.

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10

Mozzhukhin, G. V., A. V. Efremov, A. V. Bodnya, and V. V. Fedotov. "A Two-Spiral Flat Coil for Detecting 14N NQR Signals." Russian Physics Journal 48, no. 9 (September 2005): 978–83. http://dx.doi.org/10.1007/s11182-006-0013-0.

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11

ZHUANG, Hao-yu, Guo-zheng YAN, Kai ZHAO, and Qian FEI. "Design of spiral flat transmitting coil pair for intestinal robot." Optics and Precision Engineering 29, no. 1 (2021): 84–90. http://dx.doi.org/10.37188/ope.20212901.0084.

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12

Kim, Hyung Sik, Sang Pyo Hong, Mi Hyun Choi, Hyun Joo Kim, In Hwa Lee, Na Rae You, Jeong Han Yi, and Soon Cheol Chung. "A Study on the Characteristics of a Vibrator Using Flat PCB-Coil." Applied Mechanics and Materials 392 (September 2013): 738–42. http://dx.doi.org/10.4028/www.scientific.net/amm.392.738.

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In this study, we developed and evaluateda vibrator using a flat PCB-coil. The flat PCB-coil vibrator was fabricated on a printed circuit board using and etching process. The spiral pattern was etched on a fiberglass cloth with an epoxy resin. To evaluatethe flat PCB-coil vibrator, we generated a sine wave, saw-tooth, and square wave through a custom made wave generator and amplified the waveforms using a power amplifier. A three-axis accelerometer was used to evaluate the performance of the developed vibrator. Even though the developed vibrator is simple, it has a wide range of vibration frequency (50~500 Hz) and vibration amplitude (0~5 V). The vibration amplitude does not change due to frequency change. It is expected that the developed vibrator can be used in a wide variety of applications such as in a tactile stimulator, in elastography, energy harvesting, and in a cooling system.

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13

Idiatullov, Z. R., I. I. Ahmetov, M. M. Fatyhov, S. V. Spiridonov, and I. M. Lerner. "Physical modeling of metamatereals on the basis of the flat spiral coil." SYNCHROINFO JOURNAL 6, no. 4 (2020): 18–30. http://dx.doi.org/10.36724/2664-066x-2020-6-4-18-30.

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In this work, the problems of physical modeling of metamaterials based on flat spiral coils with different geometric shapes were considered. The main parameters of the structures metamaterial modeling, methods of creation, as well as their unique properties are considered. As a result of physical modeling, structures were obtained that model the metamaterial with different values of dimensions and parameters. On the basis of the experimental data, the best variant of the geometric shape of the structure element was determined, based on the highest transmission coefficient.

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14

Paese, Evandro, Martin Geier, Roberto P. Homrich, Pedro Rosa, and Rodrigo Rossi. "Sheet metal electromagnetic forming using a flat spiral coil: Experiments, modeling, and validation." Journal of Materials Processing Technology 263 (January 2019): 408–22. http://dx.doi.org/10.1016/j.jmatprotec.2018.08.033.

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15

Paese, E., M. Geier, R. P. Homrich, and J. L. Pacheco. "Simplified Mathematical Modeling for an Electromagnetic Forming System with Flat Spiral Coil as Actuator." Journal of the Brazilian Society of Mechanical Sciences and Engineering 33, no. 3 (September 2011): 324–31. http://dx.doi.org/10.1590/s1678-58782011000300008.

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16

TACHIBANA, Kunihiko, and Koichi OKA. "Study on the Transmission Efficiency of Wireless Charging System using Asymmetrical Flat Spiral Coil." Journal of the Japan Society of Applied Electromagnetics and Mechanics 22, no. 1 (2014): 41–47. http://dx.doi.org/10.14243/jsaem.22.41.

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17

Paese, E., Pedro A. R. Rosa, Martin Geier, Roberto P. Homrich, and R. Rossi. "An Analysis of Electromagnetic Sheet Metal Forming Process." Applied Mechanics and Materials 526 (February 2014): 9–14. http://dx.doi.org/10.4028/www.scientific.net/amm.526.9.

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Electromagnetic forming (EMF) is a high-speed forming process that uses energy density of a pulsed magnetic field to deform metallic workpieces. This paper presents a method to calculate the electromagnetic force in thin flat plates using a flat spiral coil as an actuator. The method is based on the Biot-Savart law, and the solution of magnetic induction integral equations is performed inside Matlab®by a numerical method based on discretizing the EMF system in a system of ordinary differential equations that couple the electric and magnetic phenomena. Free bulging experiments and a comparison with Ansoft Maxwell®software are presented demonstrating a good correlation with the proposed implementation.

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18

Revets, Stefan A. "Spirals: their orientation and description." Journal of Micropalaeontology 13, no. 1 (September 1, 1994): 54. http://dx.doi.org/10.1144/jm.13.1.54.

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Abstract. The trochoid coiling mode is the most dominant amongst hyaline foraminifera. The parallels in shape with especially gastropods neatly explains the use of the same terms to describe the spiral coiling. Other terms came in use, at first well-defined, but gradually losing their precision. Because of growing demands of systematics and changes in stress of use and value of characters, the inadequacy of this terminology has become a stumbling block. The terms ventral/dorsal and spiral/umbilical denote different things and are therefore all useful: the latter pair should not be relinquished as suggested (Haynes, 1990: 512). Historically, the terms ventral/dorsal and upper and lower side have been used by most students of the foraminifera with only few exceptions (notably Reuss and Loeblich & Tappan). Despite the protist nature of foraminifera, dorsal and ventral continued to be used, analogous to terms used to describe, for example gastropods. Far fewer problems beset the terms spiral and umbilical, which arc generally defined (Oxford English Dictionary) as: spiral a.. n. & v. 1. a. Coiled; winding about a centre in an enlarging or decreasing circular motion, either on a flat plane or rising in a cone. spire n. Spiral, coil; single twist of this; upper part of spiral shell [F. f. Lf. Gk speira coil] umbilical a. 1. Of, situated near, affecting, the umbilicus 2. Centrally placed. umbilicus n. Navel; (Bot. & Zool.) navel-like formation; (Geom.) point in a surface through which all cross-sections have same curvature [I., rel. to Gk omphalos]ORIENTATION: A GEOMETRICAL . . .

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19

Peng, Chang, Li Qiu, Ke Shen Gong, and Ding Jun Wang. "Research on Workpiece Deformation in Electromagnetic Forming Process with Finite Element Method." Advanced Materials Research 989-994 (July 2014): 2702–4. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2702.

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Electromagnetic forming is a kind of processing technology that use lorentz force to make rapid prototyping of metal workpiece, which can significantly improve the metal forming performance,and it is expected to become an emerging technology that alternative to traditional machining to process light alloy materials. Based on the understanding the basic structure of the electromagnetic coupling on the basis of physical process of electromagnetic forming, this article adopt ANSYS sequential coupling method to simulate the electromagnetic coupling process of electromagnetic structure, and analysis of tube electromagnetic forming and plate of workpiece in the process of free bulging deformation behavior. The solenoid coil tubing have an axis of symmetry due to bulging, and it’s electromagnetism load and constraint has symmetry, so its formability is uniform in hoop direction. When the plank free bulge, the distribution of the electromagnetic force caused by the flat spiral coil is not uniform,and the artifacts accelerate fastest in the part of the radius of coil 1/2, but the center area of the workpiece’s forming height is highest.

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20

Khort, Dmitriy, Igor Smirnov, Alexey Kutyrev, and Rostislav Filippov. "Device for automated magnetic pulse stimulation of plant production processes." E3S Web of Conferences 161 (2020): 01064. http://dx.doi.org/10.1051/e3sconf/202016101064.

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Numerous studies of various physical factors show the promise of using pulsed magnetic fields in bioregulatory technologies to stimulate plant life and growth processes. As a result of exposure to garden strawberries with a low-frequency magnetic field, the quality of planting material improves, plant immunity increases, crop growth and development accelerates, the number and weight of berries increase. The article presents a developed automated device for magnetic pulse processing (MPP) of plants, considers the device, design and principle of its operation. The electrical circuit of the device and its technical characteristics are given. According to the results of a laboratory experiment, the magnetic field parameters of the working body of the device in the near zone of a flat spiral coil were established. The numerical value of the magnetic induction at a distance of 100 mm from the center of the coil is 8.3 mT.

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21

Spaggiari, Andrea, and Eugenio Dragoni. "Modelling of Shape Memory Alloy Negator Springs for Long-Stroke Constant-Force Actuators." Advances in Science and Technology 78 (September 2012): 52–57. http://dx.doi.org/10.4028/www.scientific.net/ast.78.52.

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The paper deals with the analytical modelling of a shape memory alloy Negator spring. Negator springs are spiral springs made of strip metal wound on the flat with an inherent curvature such that, in repose, each coil wraps tightly on its inner neighbour. This configuration allows a constant force mechanical response and very long strokes, limited mainly from the total length of the spring. The authors investigate the behaviour of the spring made of a shape memory alloy (SMA). The intrinsic characteristic of SMA is to have two different elastic moduli at different temperatures. This difference can be exploited in order to have a net actuation force for the entire very long stroke, overcoming the two major drawbacks of the SMA actuators, short strokes and output force which varies linearly during the travel.

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22

Luo, Win-Jet, C. Bambang Dwi Kuncoro, and Yean-Der Kuan. "Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application." Energies 13, no. 2 (January 15, 2020): 419. http://dx.doi.org/10.3390/en13020419.

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Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, inflexible inconvenience for enhancing the user experience. This paper presents an innovative portable audio device battery built-in charger method based on wireless power technology. The developed charging device is composed of a headphone hanger pad for the wireless headphone and a charging pad for the portable wireless audio device battery charging. Circular flat spiral air-core coil was designed and evaluated using a numerical method to obtain optimal vertical magnetic field distribution based on the proposed evaluation criteria. A coil has inner coil diameter of 25 mm, outer coil diameter of 47.8 mm, wire diameter of 0.643 mm, the pitch of 0.03 mm and a number of turns of 17 was chosen to be implemented on the transmitter coil. A magnetic induction technique was adopted in the proposed wireless power transmission module which was implemented using commercial off-the-shelf components. For experimental and validation purposes, a developed receiver module applied to the commercial wireless headphone and portable audio speaker have a built-in battery capacity at 3.7 V 300 mAh. The experimental results show that the wireless power hanger pad prototype can transfer a 5 V induction voltage at a maximum current of 1000 mA, and the power transfer efficiency is around 70%. It works at 110 kHz of operation frequency with a maximum transmission distance of about 10 mm and takes 1 h to charge fully one 3.7 V 300 mAh polymer lithium battery.

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23

TAKATSU, Nobuo, Masana KATO, and Toshimi TOBE. "High speed forming of metal sheets by electromagnetic force. 1st report. Measurement of electromagnetic force generated by a spiral flat coil." Transactions of the Japan Society of Mechanical Engineers Series C 53, no. 493 (1987): 2042–47. http://dx.doi.org/10.1299/kikaic.53.2042.

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24

TAKATSU, Nobuo, Masana KATO, Keijin SATO, and Toshimi TOBE. "High speed forming of metal sheets by electromagnetic force. 2nd report. Analysis of the electromagnetic impulsive force generated by a spiral flat coil." Transactions of the Japan Society of Mechanical Engineers Series C 53, no. 496 (1987): 2711–16. http://dx.doi.org/10.1299/kikaic.53.2711.

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25

Zhou, Jie, De-jun Li, and Ying Chen. "Efficiency Improvement of Underwater Midrange Inductive Contactless Power Transmission Via a Relay Resonator." Marine Technology Society Journal 48, no. 3 (May 1, 2014): 73–87. http://dx.doi.org/10.4031/mtsj.48.3.3.

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AbstractInductive contactless power transmission (ICPT) offers a safe and convenient means of delivering energy underwater. However, ICPT is capable of transferring power effectively only within a near-distance range (millimeters). In recent years, magnetic resonance coupled power transmission (MRCPT), which can wirelessly deliver power across a distance of meters, has been introduced and studied. Nevertheless, MRCPT is usually operated at a very high resonance frequency (MHz) and is unavailable for underwater applications because of the considerable power loss in water. In this paper, we present an ICPT system with a relay resonator for a midrange efficiency improvement. The proposed system is based on an (inductor-capacitor) LC resonance circuit, rather than magnetic resonance. The system operates at a lower resonance frequency than the typical MRCPT system. A theoretical model is introduced for the proposed system using coupled mode theory. Theoretical treatments and an analysis of the system parameters are presented for improving the efficiency in underwater environments. The inductance and stray capacitance of a relay coil with a flat spiral profile are calculated. The experimental results indicate that the proposed system can substantially enhance the power transmission efficiency under water in midrange distances (≥10 cm) compared with the ICPT system without a relay resonator.

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26

Wu, Qidong, Zongliang Wu, Lei Zhang, and Haiyang Wang. "Clinical Application of Medical Imaging in Neurointerventional Treatment of Brain Diseases." Journal of Medical Imaging and Health Informatics 11, no. 7 (July 1, 2021): 1869–76. http://dx.doi.org/10.1166/jmihi.2021.3537.

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The incidence rate of cerebral infarction is high, and the risk of death is also grown significantly with age. Atherosclerotic stenosis is a part of the main causes of cerebral infarction. The effect of drug conservative therapy is not ideal. Interventional therapy is tantamount to send the guidewire, catheter and so on to the lesion site using imaging means, and operates the local area to achieve the purpose of a precise treatment. Therefore, it is important to explore the characteristics and high-risk factors of complications for clinical prevention and guidance of treatment righteousness. This study was to investigate the clinical effect of digital subtraction angiography (DSA) in the treatment of ischemic cerebrovascular disease. Also, this paper discusses the clinical effect of digital subtraction angiography (DSA) in the treatment of cerebral infarction. It has been proved that the application of flat detector CT in the interventional room can not only obtain high-quality 3D angiography (3D rotational angiography), but also display the vessels and high-density structures (skeleton, vascular clamp, coil, stent, and ingenious plaque). Fd-ct has also been proved to be able to perform 3D reconstruction on the stent placed in the patient’s heart and the stent of the external carotid artery. Compared with multi-slice spiral CT, the stent is much clearer and can be used to evaluate the soil and stent placement in the treatment of aneurysms.

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27

Franyuk, V. A., and L. F. Ivan'kovich. "Eddy-current transducer based on flat spiral coils." NDT International 23, no. 6 (December 1990): 363. http://dx.doi.org/10.1016/0308-9126(90)90936-i.

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28

Alinger, Dustin J., Allison K. Porter, and Raymond J. Sedwick. "Optimization of Resonant Inductive Wireless Power Transfer Using Multilayer Flat Spiral Coils." Journal of Spacecraft and Rockets 52, no. 2 (March 2015): 560–68. http://dx.doi.org/10.2514/1.a32901.

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29

Matsumoto, Hideyuki, Fitri Octaviana, Ritsuko Hanajima, Yasuo Terao, Masashi Hamada, Akihiro Yugeta, Satomi Inomata-Terada, Setsu Nakatani-Enomoto, Shoji Tsuji, and Yoshikazu Ugawa. "8. Magnetic stimulation of cauda equina in spinal canal with a flat large round coil." Clinical Neurophysiology 120, no. 5 (May 2009): e149. http://dx.doi.org/10.1016/j.clinph.2009.02.014.

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30

Liu, Ning, Zhipeng Lai, Quanliang Cao, Yujie Huang, Meng Chen, Changxing Li, Xiaotao Han, and Liang Li. "Effects of the inner/outer diameters of flat spiral coils on electromagnetic sheet metal formation." International Journal of Advanced Manufacturing Technology 109, no. 5-6 (July 2020): 1541–51. http://dx.doi.org/10.1007/s00170-020-05729-5.

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31

Matsumoto, Hideyuki, Fitri Octaviana, Yasuo Terao, Ritsuko Hanajima, Akihiro Yugeta, Masashi Hamada, Satomi Inomata-Terada, Setsu Nakatani-Enomoto, Shoji Tsuji, and Yoshikazu Ugawa. "Magnetic stimulation of the cauda equina in the spinal canal with a flat, large round coil." Journal of the Neurological Sciences 284, no. 1-2 (September 2009): 46–51. http://dx.doi.org/10.1016/j.jns.2009.04.003.

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32

Mohdeb, Naamane. "COMPARATIVE STUDY OF CIRCULAR FLAT SPIRAL COILS STRUCTURE EFFECT ON MAGNETIC RESONANCE WIRELESS POWER TRANSFER PERFORMANCE." Progress In Electromagnetics Research M 94 (2020): 119–29. http://dx.doi.org/10.2528/pierm20051705.

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33

TAKATSU, Nobuo, Masana KATO, Keijin SATO, and Toshimi TOBE. "High speed forming of metal sheets by electromagnetic force. 3rd report. Free bulging of circular aluminum plates by spiral flat coils." Transactions of the Japan Society of Mechanical Engineers Series C 53, no. 496 (1987): 2717–23. http://dx.doi.org/10.1299/kikaic.53.2717.

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34

Franyuk, V. "Eddy-current transducer based on flat spiral coils Soviet journal of nondestructive testing, Vol. 24, No. 4, pp. 235–238 (Dec. 1988)." NDT & E International 23, no. 6 (December 1990): 363. http://dx.doi.org/10.1016/0963-8695(90)90233-9.

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35

Harrison, S. J. "Three Notes on Apuleius." Classical Quarterly 38, no. 1 (January 1988): 265–67. http://dx.doi.org/10.1017/s0009838800031566.

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I quote Griffiths' translation: ‘A crown of many designs with all kinds of flowers had girt her lofty head; in its centre a flat disk above the forehead shone with a clear light in the manner of a mirror or indeed the moon, while on its right and left it was embraced by coils of uprising snakes; from above it was adorned also with outstretched ears of corn’. This is the detailed description of the crown worn by Isis in her epiphany to Lucius at Cenchreae. ‘Sulcis’ is strange; it can only refer to the tracks or furrows left by snakes, a notion wholly irrelevant here – we require a noun referring to actual physical parts of the two snakes (or rather reproductions of snakes) which border Isis' moon-disk on either side, preferably a reference to their hanging coils – so Griffiths' translation runs ‘on its right and left it was embraced by coils of uprising snakes’, though this does not render his text, which keeps ‘sulcis’. Read ‘spiris’, a word of similar shape to ‘sulcis’; ‘spirae’ is twice used of the coils of snakes by Vergil, at Aen. 2.217 and 12.848; ‘serpentum spiris’ in the latter passage may influence Apuleius’ ‘spiris…viperarum’. The alliteration and assonance of ‘spins’ and ‘spicis’ would be very much in Apuleius' manner as a jingle involving the change of a single consonant between two words – cf. Florida 3 (p. 5.10–11 Helm) ‘ita Marsyas in poenam cecinit et cecidit’, Apologia 85 (p. 94, 12–13 Helm) ‘acerbiores morsus viventi et videnti offeruntur’ and H. Koziol, Der Stil des L. Apuleius (Vienna, 1872), 204–5.

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Cui, Junjia, Chaochao Zeng, Hao Jiang, and Guangyao Li. "Flat Spiral Coil Design for Higher Riveting Force and Energy Saving in the Electromagnetic Riveting Process." Journal of Manufacturing Science and Engineering 141, no. 10 (August 30, 2019). http://dx.doi.org/10.1115/1.4044519.

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Abstract Electromagnetic riveting (EMR) belongs to the green manufacturing process, which has the advantages of low noise, no pollution, and large riveting force. In this paper, the influences of structural parameters of a flat spiral coil on riveting force and energy saving were investigated, and the cross-section geometry, base angle, and height of the coil section were designed. The EMR simulation models with fully coupled electromagnetic–thermal–mechanical were built in ls-dyna software, and the riveting force was adopted to assess the performances of different types of coils. The results showed that the riveting force given by trapezoid cross-section coil was the largest compared with rectangular, pentagonal, and circular types. Moreover, the increase in the base angle and height of the coil section had a positive effect on improving the riveting force and energy saving. In addition, weights analyses showed that the contribution rates of three structural parameters (length of the bottom edge, base angle, and height) of the coil to energy saving were 0.5231, 0.2347, and 0.2422, respectively. In general, the riveting force was improved and discharge energy was saved by adjusting geometric parameters of the coil. The research could provide guidance for the coil design in the EMR process.

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Yu, Jun, Kai Ying, David Hasko, Sungsik Lee, Arman Ahnood, W. I. Milne, and Arokia Nathan. "Thin Film Coil Design Considerations for Wireless Power Transfer in Flat Panel Display." MRS Proceedings 1388 (2012). http://dx.doi.org/10.1557/opl.2012.814.

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AbstractWireless power transfer is experimentally demonstrated by transmission between an AC power transmitter and receiver, both realised using thin film technology. The transmitter and receiver thin film coils are chosen to be identical in order to promote resonant coupling. Planar spiral coils are used because of the ease of fabrication and to reduce the metal layer thickness. The energy transfer efficiency as a function of transfer distance is analysed along with a comparison between the theoretical and the experimental results.

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"Development of Multi-Objective Optimization Model for Electromagnetic Die Forming of Aa5083 Aluminum Alloy Sheet." International Journal of Innovative Technology and Exploring Engineering 9, no. 2S4 (December 31, 2019): 477–83. http://dx.doi.org/10.35940/ijitee.b1217.1292s419.

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Electromagnetic die forming is a high-speed formation method that can be quite effective in increasing the limits on the shape of the metal sheet of low weight and of the strong electrical conductivity content. A coil is an essential instrument for transmitting electrical power to plastic energy, and the geometry of the coil plays a key role in macrofield transmission. Experiments of the electrical composition of 0.5 mm, 0.7 mm and 0.9 mm AA5083 aluminum sheets are performed via the box-behnken technique with a single layer spiral and a flat square-cross section and spiral. Evaluating characteristics like total height, rib height internal diameter, and external diameter for various charge voltage and current was investigated for the forming behaviour. The results show that the efficiency of production is very dependent on the divide and thickness of work pieces.

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Xu, Junrui, Moxi Hua, Yuanhua Feng, Pengfei Gao, and Junjia Cui. "Electromagnetic impacting medium forming (EIMF) for aluminum alloy tube by using flat spiral coil." International Journal of Material Forming, March 23, 2020. http://dx.doi.org/10.1007/s12289-020-01550-3.

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"A 1-kW Wireless Power Transfer System for Electric Vehicle Charging with Hexagonal Flat Spiral Coil." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2021. http://dx.doi.org/10.3906/elk-2012-68.

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Jessop, Matthew, Benoit Arragain, Roger Miras, Angélique Fraudeau, Karine Huard, Maria Bacia-Verloop, Patrice Catty, Jan Felix, Hélène Malet, and Irina Gutsche. "Structural insights into ATP hydrolysis by the MoxR ATPase RavA and the LdcI-RavA cage-like complex." Communications Biology 3, no. 1 (January 28, 2020). http://dx.doi.org/10.1038/s42003-020-0772-0.

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AbstractThe hexameric MoxR AAA+ ATPase RavA and the decameric lysine decarboxylase LdcI form a 3.3 MDa cage, proposed to assist assembly of specific respiratory complexes in E. coli. Here, we show that inside the LdcI-RavA cage, RavA hexamers adopt an asymmetric spiral conformation in which the nucleotide-free seam is constrained to two opposite orientations. Cryo-EM reconstructions of free RavA reveal two co-existing structural states: an asymmetric spiral, and a flat C2-symmetric closed ring characterised by two nucleotide-free seams. The closed ring RavA state bears close structural similarity to the pseudo two-fold symmetric crystal structure of the AAA+ unfoldase ClpX, suggesting a common ATPase mechanism. Based on these structures, and in light of the current knowledge regarding AAA+ ATPases, we propose different scenarios for the ATP hydrolysis cycle of free RavA and the LdcI-RavA cage-like complex, and extend the comparison to other AAA+ ATPases of clade 7.

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