Littérature scientifique sur le sujet « Low frequency electromagnetic waves »

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Articles de revues sur le sujet "Low frequency electromagnetic waves"

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Guenneau, S., C. Geuzaine, A. Nicolet, A. B. Movchan et F. Zolla. « Low frequency electromagnetic waves in periodic structures ». International Journal of Applied Electromagnetics and Mechanics 19, no 1-4 (24 avril 2004) : 479–83. http://dx.doi.org/10.3233/jae-2004-612.

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Tarkhanyan, Roland H., et Dimitris G. Niarchos. « Negative refraction of low-frequency electromagnetic waves ». physica status solidi (RRL) - Rapid Research Letters 2, no 5 (octobre 2008) : 239–41. http://dx.doi.org/10.1002/pssr.200802143.

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Morales, J., M. Garcia, C. Perez, J. V. Valverde, C. Lopez-Sanchez, V. Garcia-Martinez et J. L. Quesada. « Low frequency electromagnetic radiation and hearing ». Journal of Laryngology & ; Otology 123, no 11 (2 juillet 2009) : 1204–11. http://dx.doi.org/10.1017/s0022215109005684.

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AbstractObjective:To analyse the possible impact of low and extremely low frequency electromagnetic fields on the outer hairs cells of the organ of Corti, in a guinea pig model.Materials and methods:Electromagnetic fields of 50, 500, 1000, 2000, 4000 and 5000 Hz frequencies and 1.5 µT intensity were generated using a transverse electromagnetic wave guide. Guinea pigs of both sexes, weighing 100–150 g, were used, with no abnormalities on general and otic examination. Total exposure times were: 360 hours for 50, 500 and 1000 Hz; 3300 hours for 2000 Hz; 4820 hours for 4000 Hz; and 6420 hours for 5000 Hz. One control animal was used in each frequency group. The parameters measured by electric response audiometer included: hearing level; waves I–IV latencies; wave I–III interpeak latency; and percentage appearance of waves I–III at 90 and 50 dB sound pressure level intensity.Results:Values for the above parameters did not differ significantly, comparing the control animal and the rest of each group. In addition, no significant differences were found between our findings and those of previous studies of normal guinea pigs.Conclusion:Prolonged exposure to electromagnetic fields of 50 Hz to 5 KHz frequencies and 1.5 µT intensity, produced no functional or morphological alteration in the outer hair cells of the guinea pig organ of Corti.
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Liang, Bowen, Yong Cui, Xiao Song, Liangya Li et Chen Wang. « Multi-block electret-based mechanical antenna model for low frequency communication ». International Journal of Modeling, Simulation, and Scientific Computing 10, no 05 (octobre 2019) : 1950036. http://dx.doi.org/10.1142/s1793962319500363.

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In an LF/VLF transmission system, the performance of the antenna is of great importance to the entire system. Currently, the electret-based mechanical LF/VLF antenna uses mechanical movement to accelerate electret charges to produce LF/VLF electromagnetic waves, and the frequency of these electromagnetic waves is limited by the rotation speed of the actuating motor. Based on research that addressed the relationship between antenna structure and electromagnetic wave frequency, this paper — in order to increase the frequency of electromagnetic waves — alters the charge distribution mode of the mechanical antenna while keeping the motor’s rotational speed constant to realize an increase of transmission signal frequency. The effectiveness of this method was verified by model simulation.
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Rizzato, F. B., et A. C. L. Chian. « Nonlinear generation of the fundamental radiation in plasmas : the influence of induced ion-acoustic and Langmuir waves ». Journal of Plasma Physics 48, no 1 (août 1992) : 71–84. http://dx.doi.org/10.1017/s0022377800016378.

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A nonlinear emission mechanism of electromagnetic waves at the fundamental plasma frequency has been examined by Chian & Alves. This mechanism is based on the electromagnetic oscillating two-stream instability driven by two oppositely propagating Langmuir waves. The excitation of the electromagnetic oscillating two-stream instability is due to nonlinear wave–wave coupling involving Langmuir waves, low-frequency density waves and electromagnetic waves. In this paper the Chian & Alves model is improved using the generalized Zakharov equations. Attention is directed toward the influence of induced low-frequency and Langmuir waves on the properties of the electromagnetic oscillating two-stream instability. Presumably, the properties derived in the present context may be relevant to both space and laboratory plasmas.
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Yao, S. T., Q. Q. Shi, Q. G. Zong, A. W. Degeling, R. L. Guo, L. Li, J. X. Li et al. « Low-frequency Whistler Waves Modulate Electrons and Generate Higher-frequency Whistler Waves in the Solar Wind ». Astrophysical Journal 923, no 2 (1 décembre 2021) : 216. http://dx.doi.org/10.3847/1538-4357/ac2e97.

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Abstract The role of whistler-mode waves in the solar wind and the relationship between their electromagnetic fields and charged particles is a fundamental question in space physics. Using high-temporal-resolution electromagnetic field and plasma data from the Magnetospheric MultiScale spacecraft, we report observations of low-frequency whistler waves and associated electromagnetic fields and particle behavior in the Earth’s foreshock. The frequency of these whistler waves is close to half the lower-hybrid frequency (∼2 Hz), with their wavelength close to the ion gyroradius. The electron bulk flows are strongly modulated by these waves, with a modulation amplitude comparable to the solar wind velocity. At such a spatial scale, the electron flows are forcibly separated from the ion flows by the waves, resulting in strong electric currents and anisotropic ion distributions. Furthermore, we find that the low-frequency whistler wave propagates obliquely to the background magnetic field ( B 0), and results in spatially periodic magnetic gradients in the direction parallel to B 0. Under such conditions, large pitch-angle electrons are trapped in wave magnetic valleys by the magnetic mirror force, and may provide free perpendicular electron energy to excite higher-frequency whistler waves. This study offers important clues and new insights into wave–particle interactions, wave generation, and microscale energy conversion processes in the solar wind.
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Friar, J. L., et H. R. Reiss. « Modification of nuclearβdecay by intense low-frequency electromagnetic waves ». Physical Review C 36, no 1 (1 juillet 1987) : 283–97. http://dx.doi.org/10.1103/physrevc.36.283.

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Lakhina, G. S., et N. L. Tsintsadze. « Large-amplitude low-frequency electromagnetic waves in pulsar magnetospheres ». Astrophysics and Space Science 174, no 1 (1990) : 143–50. http://dx.doi.org/10.1007/bf00645660.

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Chaston, C. C., J. W. Bonnell, C. A. Kletzing, G. B. Hospodarsky, J. R. Wygant et C. W. Smith. « Broadband low-frequency electromagnetic waves in the inner magnetosphere ». Journal of Geophysical Research : Space Physics 120, no 10 (octobre 2015) : 8603–15. http://dx.doi.org/10.1002/2015ja021690.

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Shukla, P. K., et H. U. Rahman. « Low-frequency electromagnetic waves in nonuniform gravitating dusty magnetoplasmas ». Planetary and Space Science 44, no 5 (mai 1996) : 469–72. http://dx.doi.org/10.1016/0032-0633(95)00132-8.

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Thèses sur le sujet "Low frequency electromagnetic waves"

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Liu, Zhongjian. « Investigation of low frequency electromagnetic waves for long-range lightning location ». Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760951.

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Lightning is the strongest natural electromagnetic radiation source, emitting electromagnetic energy in the frequency range from ~4 Hz to ~300 MHz or more. The location of lightning is calculated based on the received electromagnetic waves. The received electromagnetic waves, or lightning sferics, propagate from the lightning radiation source to the receiver along the ground path and reflections by the ionosphere named sky waves. Particularly for a long-baseline (>400 km) lightning receiver array, the received electromagnetic waves are usually a mixture of the ground wave and sky waves, which easily introduce a certain level of location uncertainty. Lightning sferics and the wave propagation velocity are analysed in order to mitigate the interference from long distance wave propagation. The complex lightning sferics are calculated by the Hilbert transform, which provides additional information regarding the instantaneous phase and frequency. The time differences calculated from the instantaneous phases are closer to the phase delay time introduced by the speed of light when compared to other possible signal processing methods. It is also found that the instantaneous frequencies at maximum amplitudes in the waveform bank are distance dependent, which has a potential application, i.e., to determine the distance between the lightning location and the receiver. The radio waves from two submarine communication transmitters at 20.9 kHz and 23.4 kHz exhibit phase propagation velocities that are ~0.51% slower and ~0.64% faster than the speed of light as a result of sky wave contributions and ground effects. Therefore, a novel technique with a variable phase propagation velocity is implemented for the first time using arrival time differences. The lightning locations inferred from variable velocities improve the accuracy of locations inferred from a fixed velocity by ~0.89–1.06 km when compared to the lightning locations reported by the UK MetOffice. The velocity map inferred from the calculated phase propagation velocities reflects the impact of sky waves and ground effects on the calculation of lightning locations as a result of the network configuration. Overall, the wave propagation issues are mitigated by analysis of the complex waveform and the variable phase propagation velocity. Finally, three interferometric methods, 2D lightning mapping, cross-correlation with a short time window, and lightning locations inferred from each sample, are proposed here in order to take advantage of the greater number of samples and information from the recordings.
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Seguin, Sarah Ann. « Detection of low cost radio frequency receivers based on their unintended electromagnetic emissions and an active stimulation ». Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Seguin_09007dcc80708216.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 23, 2009) Includes bibliographical references.
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Umeda, Takayuki. « Generation of low-frequency electrostatic and electromagnetic waves as nonlinear consequences of beam–plasma interactions ». American Institite of Physics, 2008. http://hdl.handle.net/2237/12028.

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Chen, Chi-Chih. « Design and applications of two low frequency guided wave electromagnetic measurement structures ». The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406708013.

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Pokkuluri, Kiran S. « Effect of Admixtures, Chlorides, and Moisture on Dielectric Properties of Portland Cement Concrete in the Low Microwave Frequency Range ». Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/37039.

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The use of electromagnetic waves as a nondestructive evaluation technique to evaluate Portland cement concrete (PCC) structures is based on the principle that a change in the structure, composition, or properties of PCC results in a change in its dielectric properties. The coaxial transmission line is one of the few devices that can measure the dielectric properties of PCC at a frequency range of 100-1000 MHz. A coaxial transmission line developed at Virginia Tech was used to study the effect of moisture, type of aggregate, water/cement ratio, curing period, admixture type (microsilica, superplasticizer, and shrinkage admixture), and chloride content on the dielectric properties of PCC. Measurements were conducted in the time domain and converted to the frequency domain using Fast Fourier Transform. The research found that an increase in the moisture content of PCC resulted in an increase in the dielectric constant. Mixes containing limestone aggregate had a greater dielectric constant than those containing granite. The dielectric constant decreased with curing period due to the reduction in free water availability. Mixes containing higher water/cement ratios exhibited a higher dielectric constant, especially in the initial curing period. The admixtures did not significantly affect the dielectric constant after one day of curing. After 28 days of curing, however, all three admixtures had an effect on the measured dielectric constant as compared to control mixes. Chloride content had a significant effect on the loss part of the dielectric constant especially during early curing. A relationship was also established between the chloride permeability (based on conductance measurements) of PCC and its dielectric constant after 75 days of moist curing.
Master of Science
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Bittle, James R. « 2017 Full Solar Eclipse| Observations and LWPC Modeling of Very Low Frequency Electromagnetic Wave Propagation ». Thesis, University of Colorado at Denver, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10843376.

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On August 21, 2017 a total solar eclipse occurred over the United States commencing on the west coast moving across to the east coast providing an opportunity to observe how the rapid day-night-day transition changed the ionosphere’s D-region electron density and how very low frequency (VLF) electromagnetic wave propagation was affected. To observe the solar obscurity effects, VLF receivers were deployed in two locations: one in the path of totality in Lakeside, Nebraska and another south of the totality path in Hugo, Colorado. The locations were chosen to achieve an orthogonal geometry between the eclipse path and propagation path of U. S. Navy VLF transmitter in North Dakota, which operates at 25.2 kHz and has call sign NML. VLF amplitude and phase changes were observed in both Lakeside and Hugo during the eclipse. A negative phase change was observed at both receivers as solar obscuration progressively increased. The observed phase changes became positive as solar obscuration reduced. The opposite trend was observed for the amplitude of the transmitted signal: growth as max totality approached and decay during the shadow’s recession. The Long Wave Propagation Capability (LWPC) code developed by the US Navy was used to model the observations. LWPC is a modal solution finder for Earth-ionosphere waveguide propagation that takes into account the D-region density profile. In contrast to past efforts where a single ionosphere profile was assumed over the entire propagation path, a degree of spatial resolution along the path was sought here by solving for multiple segments of length 100-200 km along the path. LWPC modeling suggests that the effective reflection height changed from 71 km in the absence of the eclipse, to 78 km at the center of the path of totality during the total solar eclipse and is on agreement with past work.

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MAROUAN, YOUSSEF. « Etat de polarisation et caracteristiques de propagation moyennes d'emissions em naturelles dans un magnetoplasma froid : application aux donnees ebf du satellite aureol-3 ». Orléans, 1988. http://www.theses.fr/1988ORLE2040.

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Observation supposee effectuee en un point fixe de l'espace. Cette observation consiste en la mesure simultanee d'au moins trois composantes du champ electromagnetique. Discussion des estimateurs du degre de polarisation proposes par samson. Simulation numerique. Identification experimentale des modes d'une onde multiple en propagation dans ce magnetoplasma (ou deux modes peuvent coexister), obtenue a partir des caracteristiques de polarisation des ondes. Application aux emissions tres basse frequence observees par satellite aureol-3
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Suedan, Gibreel A. « High frequency beam diffraction by apertures and reflectors ». Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27545.

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Most solutions for electromagnetic wave diffraction by obstacles and apertures assume plane wave incidence or omnidirectional local sources. Solutions to diffraction problems for local directive sources are needed. The complex source point representation of directive beams together with uniform solutions to high frequency diffraction problems is a powerful combination for this. Here the method is applied to beam diffraction by planar structures with edges, such as the half-plane, slit, strip, wedge and circular aperture. Previously used restrictions to very narrow beams and paraxial regions, are removed here and the range of validity increased. Also it is shown that the complex source point method can give a better approximation to broad antenna beams than the Gaussian function. The solution derived for the half-plane problem is uniform, accurate and valid for all beam orientations. This solution can be used as a reference solution for other uniform or asymptotic solutions and is used to solve for the wide slit and complementary strip problems. Uniform solutions for omidirectional sources are developed and extended analytically to become solutions for directive beams. The uniform theory of diffraction is used to obtain uniform solutions where there are no simple exact solutions, such as for the wedge and circular aperture. Otherwise rigorously correct solutions at high frequencies for singly diffracted far fields are used, such as for the half-plane, slit and strip. The geometrical theory of diffraction and equivalent line currents are used to include interaction between edges. Extensive numerical results including the limiting cases; e.g. plane wave incidence, line and point sources are given. These solutions are compared with previous solutions, wherever possible and good agreement is evident Beam diffraction by a wedge with its edge on the beam axis is analysed. This solution completes a previous asymptotic solution which is infinite on the shadow boundaries and inaccurate in the transition regions. Finally, the diffraction by a circular aperture illuminated by normally incident acoustic beam, is derived and the singularity along the axial caustic is removed using Bessel functions and a closed form expression for multiple diffraction is derived.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
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Kipp, Robert. « Mixed potential integral equation solutions for layered media structures : high frequency interconnects and frequency selective surfaces / ». Thesis, Connect to this title online ; UW restricted, 1993. http://hdl.handle.net/1773/5974.

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Lachin, Anoosh. « Low frequency waves in the solar system ». Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267713.

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Livres sur le sujet "Low frequency electromagnetic waves"

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Hitchcock, R. Timothy. Extremely low frequency (ELF) electric and magnetic fields \. Fairfax, Va : AIHA, 1995.

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C, Ferguson Dale, et United States. National Aeronautics and Space Administration., dir. Low frequency waves in the plasma environment around the shuttle. [Washington, DC : National Aeronautics and Space Administration, 1996.

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Low frequency electromagnetic design. New York : M. Dekker, 1985.

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Health and low-frequency electromagnetic fields. New Haven, CT : Yale University Press, 1994.

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Ivo, Doležel, et Karban Pavel 1979-, dir. Integral methods in low-frequency electromagnetics. Hoboken, N.J : Wiley, 2009.

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Keiling, Andreas, Dong-Hun Lee et Valery Nakariakov, dir. Low-Frequency Waves in Space Plasmas. Hoboken, NJ : John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781119055006.

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1943-, Varadan V. K., et Varadan V. V. 1948-, dir. Low and high frequency asymptotics. Amsterdam : North-Holland, 1986.

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Surkov, Vadim, et Masashi Hayakawa. Ultra and Extremely Low Frequency Electromagnetic Fields. Tokyo : Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54367-1.

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W, Hafemeister David, dir. Biological effects of low-frequency electromagnetic fields. College Park, MD : American Association of Physics Teachers, 1998.

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author, Hayakawa Masashi, dir. Ultra and extremely low frequency electromagnetic fields. Tokyo : Springer, 2014.

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Chapitres de livres sur le sujet "Low frequency electromagnetic waves"

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Chew, Weng Cho, Mei Song Tong et Bin Hu. « Low-Frequency Problems in Integral Equations ». Dans Integral Equation Methods for Electromagnetic and Elastic Waves, 107–34. Cham : Springer International Publishing, 2009. http://dx.doi.org/10.1007/978-3-031-01707-0_5.

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Yakubov, Vladimir, et Dmitry Sukhanov. « Applications of Low‑Frequency Magnetic Tomography ». Dans Electromagnetic and Acoustic Wave Tomography, 313–22. Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018. | “A CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa plc.” : CRC Press, 2018. http://dx.doi.org/10.1201/9780429488276-13.

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Yakubov, Vladimir, Sergey Shipilov, Dmitry Sukhanov et Andrey Klokov. « Low-Frequency Magnetic and Electrostatic Tomography ». Dans Electromagnetic and Acoustic Wave Tomography, 79–87. Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018. | “A CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa plc.” : CRC Press, 2018. http://dx.doi.org/10.1201/9780429488276-4.

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Sarkar, Tapan K., Jinhwan Koh et Magdalena Salazar Palma. « Generation of Wideband Electromagnetic Responses Using Early-Time and Low-Frequency Data ». Dans Novel Technologies for Microwave and Millimeter — Wave Applications, 411–24. Boston, MA : Springer US, 2004. http://dx.doi.org/10.1007/978-1-4757-4156-8_19.

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Simões, Fernando, Robert Pfaff, Jean-Jacques Berthelier et Jeffrey Klenzing. « A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms ». Dans Dynamic Coupling Between Earth’s Atmospheric and Plasma Environments, 551–93. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-5677-3_20.

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Chaudhuri, S. K. « Electromagnetic Low Frequency Imaging ». Dans Inverse Methods in Electromagnetic Imaging, 997–1007. Dordrecht : Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5271-3_17.

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Chaudhuri, S. K. « Electromagnetic Low Frequency Imaging ». Dans Inverse Methods in Electromagnetic Imaging, 997–1007. Dordrecht : Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-010-9444-3_56.

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Cui, Jianzhong, Haitao Zhang, Lei Li, Yubo Zuo et Hiromi Nagaumi. « Electromagnetic Stirring and Low-Frequency Electromagnetic Vibration ». Dans Solidification Processing of Metallic Alloys Under External Fields, 119–51. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94842-3_4.

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Todorov, Nencho G. « Magnetotherapy with Low-Frequency Electromagnetic Field ». Dans Electromagnetic Fields and Biomembranes, 129–33. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-9507-6_14.

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Faessler, A., R. Nojarov et Z. Bochnacki. « Low-Frequency Neutron-Proton Vibrations ». Dans Weak and Electromagnetic Interactions in Nuclei, 339–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71689-8_71.

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Actes de conférences sur le sujet "Low frequency electromagnetic waves"

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Zakharchenko, Vladimir D. « Modelling of Low-altitude Altimeters Using Additional Frequency Modulation ». Dans 2021 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2021. http://dx.doi.org/10.1109/rsemw52378.2021.9494124.

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Elizarov, Sergey V., et Andrey P. Smirnov. « Methods for Reflectivity Measurements of Objects and Materials on the Low Frequency ». Dans 2021 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2021. http://dx.doi.org/10.1109/rsemw52378.2021.9494114.

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Skrylev, A. V., A. E. Panich et G. S. Radchenko. « Quazistatic piezoelectric-magnet-metal symmetric device for effective measurement of low-frequency magnetic field ». Dans 2017 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2017. http://dx.doi.org/10.1109/rsemw.2017.8103682.

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Lin, B., et A. B. Cerato. « Study of Expansive Soil Behavior Using Low to Medium Frequency Electromagnetic Waves ». Dans GeoFlorida 2010. Reston, VA : American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41095(365)69.

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Eklund, Gunnar, Tobias Bergsten, Valter Tarasso et Karl-Erik Rydler. « Determination of transition error corrections for low frequency stepwise-approximated Josephson sine waves ». Dans 2010 Conference on Precision Electromagnetic Measurements (CPEM 2010). IEEE, 2010. http://dx.doi.org/10.1109/cpem.2010.5545119.

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Yang, Min, Guancong Ma, Songwen Xiao, Zhiyu Yang et Ping Sheng. « Hybrid resonance and the total absorption of low frequency acoustic waves ». Dans 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2015. http://dx.doi.org/10.1109/metamaterials.2015.7342498.

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Korshunova, E. N., A. N. Sivov et A. D. Shatrov. « Low-frequency resonator antenna converting linear polarized waves into circular ». Dans Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop. DIPED - 99. IEEE, 1999. http://dx.doi.org/10.1109/diped.1999.822153.

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James, H. G., et A. W. Yau. « Observations of Electromagnetic Waves at Very Low Frequency in the Near Topside Ionosphere ». Dans 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2019. http://dx.doi.org/10.1109/iceaa.2019.8879120.

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Wang, Jinhong, Lei Sang et Bin Li. « The Detection of Buried Objects in Shallow Sea with Low Frequency Electromagnetic Waves ». Dans 2018 OCEANS - MTS/IEEE Kobe Techno-Ocean (OTO). IEEE, 2018. http://dx.doi.org/10.1109/oceanskobe.2018.8559390.

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Shukla, Padma Kant. « New generalized dispersion relation for low-frequency electromagnetic waves in Hall-magnetohydrodynamic dusty plasmas ». Dans NEW VISTAS IN DUSTY PLASMAS : Fourth International Conference on the Physics of Dusty Plasmas. AIP, 2005. http://dx.doi.org/10.1063/1.2134627.

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Rapports d'organisations sur le sujet "Low frequency electromagnetic waves"

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Sweeney, J. Low Frequency Electromagnetic Pulse and Explosions. Office of Scientific and Technical Information (OSTI), février 2011. http://dx.doi.org/10.2172/1030215.

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Casey, K., et H. Pao. Low-Frequency Electromagnetic Backscatter from Buried Tunnels. Office of Scientific and Technical Information (OSTI), juin 2006. http://dx.doi.org/10.2172/891712.

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Aldrich, T. (Low frequency electromagnetic fields and public health). Office of Scientific and Technical Information (OSTI), mai 1988. http://dx.doi.org/10.2172/6866726.

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Unknown, Author. L51630 In-Line Detection and Sizing of Stress Corrosion Cracks Using EMAT Ultrasonics. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), avril 1990. http://dx.doi.org/10.55274/r0010616.

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The development of stress corrosion cracks (SCC) in buried gas pipelineshas posed a serious threat to pipeline integrity for many years. It can be reliably detected by magnetic particle techniques in the field or by laboratory studies using low frequency eddy currents. It is also possible to find and measure the depths of the cracks from the ID by careful scanning with an ultra-sonic angle beam probe but the transducer must be manipulated by a skilled operator. All of these approaches are not very satisfactory for in-line inspections because they are not suitable for covering the total area of a pipeline and they are too labor intensive to be automated. In order to address this problem with new technology, the PRCI requested proposals for any technique that seemed to be practical and the Electromagnetic Acoustic Transducer (EMAT) was suggested as very promising because it has already demonstrated operation in the environment of the inside of a gas pipeline. Magnasonics, Inc., of Albuquerque, New Mexico, was chosen from many respondents to conduct an in-vestigation of the use of EMATs for overcoming the problems expected to arise from in-line operation and to incorporate the latest developments in ultrasonic inspection with EMATs. The objective of the program described in this report was twofold. First, to apply the most recent developments in EMAT technology to the problem of detecting and sizing stress corrosion cracks (SCC) in operating gas pipelines and second to exploit the ability of EMATs to generate and detect a wide variety of ultrasonic waves in the walls of a pipeline under operating conditions.
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Ford, S., et J. Sweeney. Low-frequency Electromagnetic Detection Limits of Underground Nuclear Explosions. Office of Scientific and Technical Information (OSTI), septembre 2020. http://dx.doi.org/10.2172/1670539.

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Shubitidze, Fridon. A Low Frequency Electromagnetic Sensor for Underwater Geo-Location. Fort Belvoir, VA : Defense Technical Information Center, mai 2011. http://dx.doi.org/10.21236/ada548971.

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Mayhall, D. A Preliminary Low-Frequency Electromagnetic Analysis of a Flux Concentrator. Office of Scientific and Technical Information (OSTI), juin 2006. http://dx.doi.org/10.2172/900087.

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Galperin, Yu M., D. A. Parshin et V. N. Solovyev. Nonlinear Low-Temperature Absorption of Ultrasound and Electromagnetic Waves in Glasses. [б. в.], août 1989. http://dx.doi.org/10.31812/0564/1243.

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Our aim is to consider nonlinear absorption of ultrasonic (or electromagnetic) waves by two-level systems (TLS's ) in glasses. We are interested in the relaxational contribution to the absorption (the resonant one, if present, saturates at very low intensity of the wave).
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Sharma, Mukul, Javid Shiriyev, Peng Zhang, Yaniv Brick, Dave Glowka, Jeff Gabelmann et Robert Houston. Fracture Diagnostics Using Low Frequency Electromagnetic Induction and Electrically Conductive Proppants. Office of Scientific and Technical Information (OSTI), décembre 2018. http://dx.doi.org/10.2172/1489696.

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Hewett, D. W., D. Bateson, M. Gibbons, M. Lambert, L. Tung et G. Rodrique. Coupled models in low-frequency electromagnetic simulation LDRD Final Report 94-ERI-004. Office of Scientific and Technical Information (OSTI), février 1997. http://dx.doi.org/10.2172/328157.

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