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Thematische Bibliographien / Low frequency currents interractions / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Low frequency currents interractions“

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Veröffentlicht am 11. Januar 2025

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1

Ward, Alex R., Warwick G. Oliver, and Danielle Buccella. "Wrist Extensor Torque Production and Discomfort Associated With Low-Frequency and Burst-Modulated Kilohertz-Frequency Currents." Physical Therapy 86, no. 10 (2006): 1360–67. http://dx.doi.org/10.2522/ptj.20050300.

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Abstract Background and Purpose. A randomized controlled trial to compare 2 forms of monophasic pulsed currents with 2 forms of burst-modulated, kilohertz-frequency alternating current (“Russian current” and “Aussie current”) was conducted to establish whether different amounts of wrist extensor torque were produced and whether discomfort varied with stimulus type. Subjects. The 32 subjects were adults who were healthy and were drawn from a population of staff and students at La Trobe University. Methods. Each subject received all 4 currents. Maximal electrically induced torque (MEIT) of the w

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Margetis, Dionisios, and Nikos Savva. "Low-frequency currents induced in adjacent spherical cells." Journal of Mathematical Physics 47, no. 4 (2006): 042902. http://dx.doi.org/10.1063/1.2190333.

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3

Ehst, D. A. "Toroidal equilibrium with low-frequency wave-driven currents." Nuclear Fusion 25, no. 5 (1985): 629–32. http://dx.doi.org/10.1088/0029-5515/25/5/006.

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4

Elgar, Steve, and Britt Raubenheimer. "Field Evidence of Inverse Energy Cascades in the Surfzone." Journal of Physical Oceanography 50, no. 8 (2020): 2315–21. http://dx.doi.org/10.1175/jpo-d-19-0327.1.

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AbstractLow-frequency currents and eddies transport sediment, pathogens, larvae, and heat along the coast and between the shoreline and deeper water. Here, low-frequency currents (between 0.1 and 4.0 mHz) observed in shallow surfzone waters for 120 days during a wide range of wave conditions are compared with theories for generation by instabilities of alongshore currents, by ocean-wave-induced sea surface modulations, and by a nonlinear transfer of energy from breaking waves to low-frequency motions via a two-dimensional inverse energy cascade. For these data, the low-frequency currents are n

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Rumyantsev, Sergey L., Michael S. Shur, Michael E. Levinshtein, et al. "Low Frequency Noise in 4H-SiC MOSFETs." Materials Science Forum 615-617 (March 2009): 817–20. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.817.

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Low-frequency noise in 4H-SiC MOSFETs has been measured for the first time. At drain currents varying from deep subthreshold to strong inversion, the 1/f (flicker) noise dominated at frequencies 1 - 105 Hz. The dependence of relative spectral noise density, , on drain current Id (at a constant drain voltage Vd) differs qualitatively from that in Si MOSFETs. In Si MOSFETs, ~ 1/ in strong inversion, whereas tends to saturate in sub-threshold. In 4H-SiC MOSFETs under study, ~ 1/ over the whole range of currents from deep sub-threshold to strong inversion. Similar noise behavior is often observed

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Johnson, E. R. "Boundary Currents, Free Currents and Dissipation in the Low-Frequency Scattering of Shelf Waves." Journal of Physical Oceanography 19, no. 9 (1989): 1291–300. http://dx.doi.org/10.1175/1520-0485(1989)019<1291:bcfcad>2.0.co;2.

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7

Torres, Hector S., Patrice Klein, Jinbo Wang, et al. "Wind work at the air-sea interface: a modeling study in anticipation of future space missions." Geoscientific Model Development 15, no. 21 (2022): 8041–58. http://dx.doi.org/10.5194/gmd-15-8041-2022.

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Abstract. Wind work at the air-sea interface is the transfer of kinetic energy between the ocean and the atmosphere and, as such, is an important part of the ocean-atmosphere coupled system. Wind work is defined as the scalar product of ocean wind stress and surface current, with each of these two variables spanning, in this study, a broad range of spatial and temporal scales, from 10 km to more than 3000 km and hours to months. These characteristics emphasize wind work's multiscale nature. In the absence of appropriate global observations, our study makes use of a new global, coupled ocean-at

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Wijesekera, H. W., W. J. Teague, D. W. Wang, et al. "Low-Frequency Currents from Deep Moorings in the Southern Bay of Bengal." Journal of Physical Oceanography 46, no. 10 (2016): 3209–38. http://dx.doi.org/10.1175/jpo-d-16-0113.1.

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AbstractHigh-resolution currents and hydrographic fields were measured at six deep-water moorings in the southern Bay of Bengal (BoB) by the Naval Research Laboratory as part of an international effort focused on the dynamics of the Indian Ocean. Currents, temperature, and salinity were sampled over the upper 500 m for 20 months between December 2013 and August 2015. One of the major goals is to understand the space–time scales of the currents and physical processes that contribute to the exchange of water between the BoB and the Arabian Sea. The observations captured Southwest and Northeast M

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Shevchenko, I. V., P. S. Berloff, D. Guerrero-López, and J. E. Roman. "On low-frequency variability of the midlatitude ocean gyres." Journal of Fluid Mechanics 795 (April 15, 2016): 423–42. http://dx.doi.org/10.1017/jfm.2016.208.

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This paper studies the large-scale low-frequency variability of the wind-driven midlatitude ocean gyres and their western boundary currents, such as the Gulf Stream or Kuroshio, simulated with the eddy-resolving quasi-geostrophic model. We applied empirical orthogonal functions analysis to turbulent flow solutions and statistically extracted robust and significant large-scale decadal variability modes concentrated around the eastward jet extension of the western boundary currents. In order to interpret these statistical modes dynamically, we linearized the governing quasi-geostrophic equations

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Laufer, Yocheved, and Michal Elboim. "Effect of Burst Frequency and Duration of Kilohertz-Frequency Alternating Currents and of Low-Frequency Pulsed Currents on Strength of Contraction, Muscle Fatigue, and Perceived Discomfort." Physical Therapy 88, no. 10 (2008): 1167–76. http://dx.doi.org/10.2522/ptj.20080001.

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BackgroundLow-frequency pulsed currents (LPCs) and kilohertz-frequency alternating currents (KACs) are used clinically to augment muscle contractions. Treatment effectiveness may be enhanced by selecting stimulation parameters that evoke the strongest contractions with minimal discomfort and fatigue.ObjectiveThe objective of this study was to compare maximally induced strength (force-producing capacity) of contractions, muscle fatigue, and discomfort associated with an LPC and with 3 KACs differing in frequency and duration of burst modulation.DesignThis was a repeated-measures trial, with ran

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11

Elgar, Steve, Britt Raubenheimer, David B. Clark, and Melissa Moulton. "Extremely Low Frequency (0.1 to 1.0 mHz) Surf Zone Currents." Geophysical Research Letters 46, no. 3 (2019): 1531–36. http://dx.doi.org/10.1029/2018gl081106.

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12

Han, Guoqi. "Low-frequency variability of sea level and currents off Newfoundland." Advances in Space Research 38, no. 10 (2006): 2141–61. http://dx.doi.org/10.1016/j.asr.2006.04.011.

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13

Royzen, Feliks, Sylvain Williams, Fernando R. Fernandez, and John A. White. "Balanced synaptic currents underlie low‐frequency oscillations in the subiculum." Hippocampus 29, no. 12 (2019): 1178–89. http://dx.doi.org/10.1002/hipo.23131.

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14

Shetye, S. R., S. C. Shenoi, and D. Sundar. "Observed low-frequency currents in the deep mid-Arabian Sea." Deep Sea Research Part A. Oceanographic Research Papers 38, no. 1 (1991): 57–65. http://dx.doi.org/10.1016/0198-0149(91)90054-j.

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15

Liu, Zhao, Wang, Huang, and Shi. "Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution." Energies 12, no. 8 (2019): 1467. http://dx.doi.org/10.3390/en12081467.

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Islanding detection methods, based on injecting high-/low-frequency currents or negative sequence fundamental frequency currents and observing the resultant responses, are collectively referred to as irregular current injection methods in this paper. In multi-distributed generation (DG) operation, if there is no restriction to the phase of injected irregular currents, the currents at the same frequency may cancel each other out, and then their convergent current may be too small to cause a detectable response, for which reason islanding detection will be severely affected. Accordingly, this pa

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Dantas, Lucas Ogura, Amilton Vieira, Aristides Leite Siqueira Junior, Tania Salvini, and João Luiz Durigan. "Poster 140 Comparison Between Kilohertz-Frequency Alternating Currents and Low-Frequency Pulsed Currents on Quadriceps Torque Production and Perceived Discomfort." Archives of Physical Medicine and Rehabilitation 94, no. 10 (2013): e61. http://dx.doi.org/10.1016/j.apmr.2013.08.185.

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17

Gaddameedhi, Sravanthy, and P. Srinivas. "A novel fuzzy based controller to reduce circulating currents in parallel interleaved converter connected to the grid." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 2 (2021): 1130. http://dx.doi.org/10.11591/ijece.v11i2.pp1130-1142.

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This paper exhibits suppression strategy of low frequency circulating current components for parallel inter-leaved converters. Here inverters are parallelized by magnetically coupled inductors. Traditionally, carrier interleaved technique was used to get lower distorted output voltage, but it gives a higher circulating currents to flow through the Two-VSC‘s. The mutual inductance of the coupled inductors (CI) is utilized for minimizing circulating currents of high frequency components. Nevertheless, CI can‘t have capability to riddle the components generated by low frequency. When these circul

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Farasat, Madiha, Dushmantha Thalakotuna, Yang Yang, Zhonghao Hu, and Karu Esselle. "Suppression of Common-Mode Resonance in Multiband Base Station Antennas." Sensors 23, no. 6 (2023): 2905. http://dx.doi.org/10.3390/s23062905.

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5G demands a significant increment in the number of connected devices. As a result, gNodeBs are constantly pushed to serve more spectrum and smaller sectors. These increased capacity demands are met by using multiband antennas in base stations. One of the key challenges with multiband antennas is the pattern distortions due to the presence of other surrounding antenna element structures. This work provides a novel approach to address the challenge of pattern distortion in the lower frequency band 690–960 MHz due to common-mode (CM) currents in the high- frequency-band antenna element operating

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Berthelier, A., J. C. Cerisier, J. J. Berthelikr, and L. Rnzeau. "Low-frequency magnetic turbulence in the high-latitude topside ionosphere: low-frequency waves or field-aligned currents." Journal of Atmospheric and Terrestrial Physics 53, no. 3-4 (1991): 333–41. http://dx.doi.org/10.1016/0021-9169(91)90117-p.

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20

Ward, Alex R., and Warwick G. Oliver. "Comparison of the Hypoalgesic Efficacy of Low-Frequency and Burst-Modulated Kilohertz Frequency Currents." Physical Therapy 87, no. 8 (2007): 1056–63. http://dx.doi.org/10.2522/ptj.20060203.

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Background and Purpose A within-subject randomized controlled trial was conducted to compare monophasic pulsed current (PC) with a frequency of 50 Hz and a phase duration of 500 microseconds with burst-modulated alternating current (BMAC) (1-kHz alternating current, burst modulated at a frequency of 50 Hz with a 20% duty cycle) to establish whether there were differences in hypoalgesic efficacy as assessed by cold pain threshold measurements. Subjects Twenty-two young adults who were healthy and drawn from a population of students of La Trobe University volunteered to participate in the study.

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Carandini, M., F. Mechler, C. S. Leonard, and J. A. Movshon. "Spike train encoding by regular-spiking cells of the visual cortex." Journal of Neurophysiology 76, no. 5 (1996): 3425–41. http://dx.doi.org/10.1152/jn.1996.76.5.3425.

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1. To study the encoding of input currents into output spike trains by regular-spiking cells, we recorded intracellularly from slices of the guinea pig visual cortex while injecting step, sinusoidal, and broadband noise currents. 2. When measured with sinusoidal currents, the frequency tuning of the spike responses was markedly band-pass. The preferred frequency was between 8 and 30 Hz, and grew with stimulus amplitude and mean intensity. 3. Stimulation with broadband noise currents dramatically enhanced the gain of the spike responses at low and high frequencies, yielding an essentially flat

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Pomeroy, Andrew William Mackay, Ap Van Dongeren, Ryan Lowe, Jaap Van Thiel de Vries, and Jan Roelvink. "LOW FREQUENCY WAVE RESONANCE IN FRINGING REEF ENVIRONMENTS." Coastal Engineering Proceedings 1, no. 33 (2012): 25. http://dx.doi.org/10.9753/icce.v33.currents.25.

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Low frequency wave resonance has been postulated to enhance damage to coral reef protected coastlines during storm events. This paper uses the numerical model XBeach to examine the dynamics that contribute to resonance that have been previously observed on a fringing reef on Guam during tropical storm Man-Yi (Péquignet et al., 2009). The methods to identify resonance in numerical (or field data) are comprehensively reviewed with three indicators of resonance proposed based upon data obtained at two locations in the model domain: 1. The water surface elevation must be highly coherent, 2. The ph

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Gasperikova, Erika, and H. Frank Morrison. "Mapping of induced polarization using natural fields." GEOPHYSICS 66, no. 1 (2001): 137–47. http://dx.doi.org/10.1190/1.1444888.

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The observed electromagnetic response of a finite body is caused by induction and polarization currents in the body and by the distortion of the induction currents in the surrounding medium. At a sufficiently low frequency, there is negligible induction and the measured response is that of the body distorting the background currents just as it would distort a direct current (dc). Because this dc response is not inherently frequency dependent, any observed change in response of the body for frequencies low enough to be in this dc limit must result from frequency‐dependent conductivity. Profiles

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Samigullin, D. V., E. F. Khaziev, I. V. Kovyazina, E. A. Bukharaeva, and E. E. Nikolsky. "Muscarinic regulation of calcium transient and synaptic transmission in frog neuromuscular junction." Genes & Cells 9, no. 3 (2014): 242–47. http://dx.doi.org/10.23868/gc120334.

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In frog neuromuscular junction, muscarine, exogeneous acetylcholine and acetylcholinesterase inhibitor proserine reduced the intensity of calcium-sensitive dye fluorescence (calcium transient) at low frequency of nerve stimulation, suggesting that calcium ions entry into nerve ending was decreased. M2 muscarinic receptor blocker methoctramine prevented the action of muscarine. The amplitude of endplate currents was reduced in presence of muscarine at low frequency nerve stimulation, and atropine abolished this effect. Amplitudes of endplate currents evoked by high frequency stimulation were en

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Garcia, O. E., E. Leer, H. L. Pécseli, and J. K. Trulsen. "Magnetic field-aligned plasma currents in gravitational fields." Annales Geophysicae 33, no. 3 (2015): 257–66. http://dx.doi.org/10.5194/angeo-33-257-2015.

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Abstract. Analytical models are presented for currents along vertical magnetic field lines due to slow bulk electron motion in plasmas subject to a gravitational force. It is demonstrated that a general feature of this problem is a singularity in the plasma pressure force that develops at some finite altitude when a plasma that is initially in static equilibrium is set into slow motion. Classical fluid models thus do not allow general steady-state solutions for field-aligned currents. General solutions have to be non-stationary, varying on time scales of many periods of a plasma equivalent to

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Jarzebowicz, Leszek. "Derivation of Motor Mean Phase Currents in PMSM Drives Operating with Low Switching-to-Fundamental Frequency Ratio." Power Electronics and Drives 4, no. 1 (2019): 95–102. http://dx.doi.org/10.2478/pead-2019-0003.

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AbstractPulse width modulation (PWM) of inverter output voltage causes the waveforms of motor phase currents to consist of distinctive ripples. In order to provide suitable feedback for the motor current controllers, the mean value must be extracted from the currents’ waveforms in every PWM cycle. A common solution to derive the mean phase currents is to sample their value at the midpoint of a symmetrical PWM cycle. Using an assumption of linear current changes in steady PWM subintervals, this midpoint sample corresponds to the mean current in the PWM cycle. This way no hardware filtering or h

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Black, K., P. Moran, D. Burrage, and G. De'ath. "Association of low-frequency currents and crown-of-thorns starfish outbreaks." Marine Ecology Progress Series 125 (1995): 185–94. http://dx.doi.org/10.3354/meps125185.

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Laanearu, J., and U. Lips. "Observed thermohaline fields and low-frequency currents in the Narva Bay." Proceedings of the Estonian Academy of Sciences. Engineering 9, no. 2 (2003): 91. http://dx.doi.org/10.3176/eng.2003.2.02.

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Zika, T., I. C. Gebeshuber, F. Buschbeck, G. Preisinger, and M. Gröschl. "Surface analysis on rolling bearings after exposure to defined electric stress." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 223, no. 5 (2009): 787–97. http://dx.doi.org/10.1243/13506501jet538.

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This article gives an overview about classical and frequency converter-induced spurious bearing currents in induction machines and discusses typical damage patterns caused by the current passage. To investigate on the electric damage mechanisms, test bearings are operated in a test rig and exposed to specific (classical low-frequency, and high-frequency) bearing currents. The induced damages to the surfaces are analysed visually and with the help of an atomic force microscope, and compared for the different electric regimes applied. Further, the electrically damaged bearing surfaces are charac

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Kang, Le, He Zhang, Jiakuan Xia, Meijun Qi, and Yunqi Zhao. "Research on Radial Vibration Model and Low-Frequency Vibration Suppression Method in PMSM by Injecting Multiple Symmetric Harmonic Currents." Actuators 13, no. 11 (2024): 448. http://dx.doi.org/10.3390/act13110448.

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Driven by frequency conversion, the windings of a three-phase permanent magnet synchronous motor (PMSM) contain both odd and even harmonic currents. Due to the motor’s pole–slot conductance modulation, the interaction between the magnetic fields generated by these harmonic currents and the permanent magnet field results in harmonic radial vibrations of the motor. This paper analyzes the three-phase currents of the prototype and derives the radial magnetomotive force (MMF) spatiotemporal models for symmetric harmonic currents. By integrating Maxwell’s magnetic force formula and vibration respon

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Lepidi, S., L. Cafarella, P. Francia, A. Meloni, P. Palangio, and J. J. Schott. "Low frequency geomagnetic field variations at Dome C (Antarctica)." Annales Geophysicae 21, no. 4 (2003): 923–32. http://dx.doi.org/10.5194/angeo-21-923-2003.

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Abstract. We conduct an analysis of the geomagnetic field variations recorded at the new Antarctic station Dome C, located very close to the geomagnetic pole, which has been operating for approximately one month during the 1999–2000 campaign. We also perform a comparison with simultaneous measurements at the Italian Antarctic station Terra Nova Bay, in order to investigate the spatial extension of the phenomena observed at very high latitude. Our results show that between the two stations the daily variation is similar and the fluctuations with f ~ 1 mHz are coherent, provided that in both cas

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Xiao, Yiping, Hongjian Jiao, Feng Huo, and Zongtao Shen. "Lightning Current Measurement Method Using Rogowski Coil Based on Integral Circuit with Low-Frequency Attenuation Feedback." Sensors 24, no. 15 (2024): 4980. http://dx.doi.org/10.3390/s24154980.

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A lightning current measurement method using a Rogowski coil based on an integral circuit with low-frequency attenuation feedback was proposed to address the issue of low-frequency distortion in the measurement of lightning currents on transmission lines using Rogowski coils. Firstly, the causes of low-frequency distortion in lightning current measurements using Rogowski coils were analyzed from the perspective of frequency domains. On this basis, an integration correction optimization circuit with a low-frequency attenuation feedback network was designed to correct the low-frequency distortio

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Fioranelli, Massimo, Maria Grazia Roccia, Aroonkumar Beesham, Dana Flavin, M. Ghaeni, and Faissal AZIZ. "A model for considering effects of extremely low frequency electromagnetic fields on quail embryonic cells." AIMS Biophysics 9, no. 3 (2022): 198–207. http://dx.doi.org/10.3934/biophy.2022017.

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<abstract> <p>Previous experiments have shown that extremely low frequency electromagnetic fields could cause serious effects on the evolution of cells. We propose a mathematical model which confirms those results. In our model, electromagnetic waves could cause the motions of ions and charges and the emergence of some currents around and in the interior of cells. These currents produce some waves which interact with the DNAs and remove or attach some repressors. Consequently, some genes could be turned on or off, and cells could obtain some properties or lose them. The frequency o

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El-Shahat, Mohammed, Elsayed Tag Eldin, Nourhan A. Mohamed, Ahdab EL-Morshedy, and Mohamed E. Ibrahim. "Measurement of Power Frequency Current including Low- and High-Order Harmonics Using a Rogowski Coil." Sensors 22, no. 11 (2022): 4220. http://dx.doi.org/10.3390/s22114220.

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The measurement of a power frequency current including low- and high-order harmonics is of great importance in calibration as well as in testing processes. Therefore, this paper presents the measurement of the power frequency current of light-emitting diode (LED) luminaires. LED luminaires were chosen as their input current includes both low- and high-order harmonics. The measurement process depends on reconstructing an LED luminaire current without using the coil parameters. Hence, the current reconstruction process is designed to be dependent on the measured characteristics of the Rogowski c

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Aliev, Yu M., V. Yu Bychenkov, M. S. Jovanović, and A. A. Frolov. "The kinetic theory of the nonlinear low-frequency response of a collisionless plasma to high-frequency electromagnetic radiation." Journal of Plasma Physics 48, no. 1 (1992): 167–76. http://dx.doi.org/10.1017/s0022377800016457.

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A kinetic theory of nonlinear currents, quasi-stationary electric and magnetic fields and the ponderomotive effect of high-frequency electromagnetic radiation on a collisionless plasma is developed. General expressions for nonlinear current densities, fields and ponderomotive forces that are applicable in a broad range of space-time scales, characteristie of low-frequency motion in plasma, are obtained. These expressions are compared with the results of previous papers.

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Silinsky, Eugene M. "Low-frequency Neuromuscular Depression Is a Consequence of a Reduction in Nerve Terminal Ca2+ Currents at Mammalian Motor Nerve Endings." Anesthesiology 119, no. 2 (2013): 326–34. http://dx.doi.org/10.1097/aln.0b013e31829083d8.

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Abstract Background: The decline in voluntary muscle contraction during low-frequency nerve stimulation is used clinically to assess the type and degree of neuromuscular block. The mechanism underlying this depression is unknown. Methods: Simultaneous electrophysiological measurements of neurotransmitter release and prejunctional Ca2+ currents were made at mouse neuromuscular junctions to evaluate the hypothesis that decreases in nerve terminal Ca2+ currents are responsible for low-frequency depression. Results: Under conditions generally used to measure Ca2+ currents at the neuromuscular junc

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Stuchly, M. A., and Weiguo Xi. "Modelling induced currents in biological cells exposed to low-frequency magnetic fields." Physics in Medicine and Biology 39, no. 9 (1994): 1319–30. http://dx.doi.org/10.1088/0031-9155/39/9/001.

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Matsumoto, Michio, Kazuo Sakai, and Satoshi Takeuchi. "Low Frequency Waves with Azimuthal Currents in a Weakly Magnetized Positive Column." Journal of the Physical Society of Japan 61, no. 3 (1992): 844–48. http://dx.doi.org/10.1143/jpsj.61.844.

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Schneider, Reinhold S. E., M. Mülleder, P. Zeller, P. Würzinger, G. Reiter, and S. Paul. "Effects of Low Frequency Alternating Currents on the Electro-Slag Remelting Process." BHM Berg- und Hüttenmännische Monatshefte 161, S1 (2016): 20–26. http://dx.doi.org/10.1007/s00501-016-0462-x.

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DeTracey, B. M., C. L. Tang, and P. C. Smith. "Low-frequency currents at the northern shelf edge of the Grand Banks." Journal of Geophysical Research: Oceans 101, no. C6 (1996): 14223–35. http://dx.doi.org/10.1029/96jc00923.

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Niple, J. C., J. P. Daigle, L. E. Zaffanella, T. Sullivan, and R. Kavet. "A portable meter for measuring low frequency currents in the human body." Bioelectromagnetics 25, no. 5 (2004): 369–73. http://dx.doi.org/10.1002/bem.20000.

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Uchiyama, Yusuke, James C. McWilliams, and Cigdem Akan. "Three‐dimensional transient rip currents: Bathymetric excitation of low‐frequency intrinsic variability." Journal of Geophysical Research: Oceans 122, no. 7 (2017): 5826–49. http://dx.doi.org/10.1002/2017jc013005.

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Jones, Martyn G., Evan R. Rogers, James P. Harris, et al. "Neuromodulation using ultra low frequency current waveform reversibly blocks axonal conduction and chronic pain." Science Translational Medicine 13, no. 608 (2021): eabg9890. http://dx.doi.org/10.1126/scitranslmed.abg9890.

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Chronic pain remains a leading cause of disability worldwide, and there is still a clinical reliance on opioids despite the medical side effects associated with their use and societal impacts associated with their abuse. An alternative approach is the use of electrical neuromodulation to produce analgesia. Direct current can block action potential propagation but leads to tissue damage if maintained. We have developed a form of ultra low frequency (ULF) biphasic current and studied its effects. In anesthetized rats, this waveform produced a rapidly developing and completely reversible conducti

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Maheeth, P. V. S., P. Srividya Devi, and P. Sirisha. "Artificial Intelligent Technique based Double-Frequency Analysis on a Single-Phase Grid-connected Inverter." E3S Web of Conferences 309 (2021): 01144. http://dx.doi.org/10.1051/e3sconf/202130901144.

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Now a days more power losses can be seen in grid connected inverter. In order to reduce that double frequency in single phase grid inverter with Artificial Intelligent based fuzzy control is implemented. The inverter has two operating units High Frequency Unit (HFU) and Low Frequency Unit (LFU), low frequency reduce switching losses and high frequency suppress the symphonious currents. The fuzzy logic method expected towards deliver high yield, low total symphonious distortion, rapid response. Finally Total Symphonious Distortion (THD) contrasted among fuzzy including Integral controls (PI). T

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Stewart, Duff C., Walter L. Anderson, Thomas P. Grover, and Victor F. Labson. "Shallow subsurface mapping by electromagnetic sounding in the 300 kHz to 30 MHz range: Model studies and prototype system assessment." GEOPHYSICS 59, no. 8 (1994): 1201–10. http://dx.doi.org/10.1190/1.1443678.

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A new instrument designed for frequency‐domain sounding in the depth range 0–10 m uses short coil spacings of 5 m or less and a frequency range of 300 kHz to 30 MHz. In this frequency range, both conduction currents (controlled by electrical conductivity) and displacement currents (controlled by dielectric permittivity) are important. Several surface electromagnetic survey systems commonly used (generally with frequencies less than 60 kHz) are unsuitable for detailed investigation of the upper 5 m of the earth or, as with ground‐penetrating radar, are most effective in relatively resistive env

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Armstrong, John N., and Brian A. MacVicar. "Theta-Frequency Facilitation of AMPA Receptor-Mediated Synaptic Currents in the Principal Cells of the Medial Septum." Journal of Neurophysiology 85, no. 4 (2001): 1709–18. http://dx.doi.org/10.1152/jn.2001.85.4.1709.

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Recent evidence suggests that Ca2+-permeable AMPA receptors display rapid, short-lasting current facilitation. In this study, we investigated the properties of AMPA receptor-mediated synaptic currents in medial septal neurons of the rat in an in vitro slice preparation. Immunocytochemistry with a selective antibody to the GluR2 subunit revealed that both choline acetyltransferase-containing and parvalbumin-containing neurons of the medial septum express no detectable GluR2 subunit immunoreactivity. We used whole cell voltage-clamp recordings to measure synaptically evoked AMPA receptor-mediate

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Lamy, L., P. Zarka, B. Cecconi, et al. "The low-frequency source of Saturn’s kilometric radiation." Science 362, no. 6410 (2018): eaat2027. http://dx.doi.org/10.1126/science.aat2027.

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Understanding how auroral radio emissions are produced by magnetized bodies requires in situ measurements within their source region. Saturn’s kilometric radiation (SKR) has been widely used as a remote proxy of Saturn’s magnetosphere. We present wave and plasma measurements from the Cassini spacecraft during its ring-grazing high-inclination orbits, which passed three times through the high-altitude SKR emission region. Northern dawn-side, narrow-banded radio sources were encountered at frequencies of 10 to 20 kilohertz, within regions of upward currents mapping to the ultraviolet auroral ova

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Luo, Tuo, Pinqun Jiang, Guoxian Huang, and Dong Lin. "Design and simulation of low-ripple dual active bridge DC-DC converter." Journal of Physics: Conference Series 2803, no. 1 (2024): 012058. http://dx.doi.org/10.1088/1742-6596/2803/1/012058.

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Abstract In addressing the issue of excessive high-frequency current ripple at the output port caused by high-frequency switching in traditional dual active bridge DC-DC converters, a low-ripple dual active bridge DC-DC converter was designed by replacing its switching devices with a half-bridge submodule. This converter constructs a decoupling loop for alternating and direct current components on the bridge arms, allowing the alternating components to form a loop between the bridge arms without entering the direct current port, thereby eliminating high-frequency current ripple at the direct c

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Grishkov, V. E., and S. A. Uryupin. "Generation of low-frequency nonlinear currents in plasma by an ultrashort pulse of high-frequency radiation." Plasma Physics Reports 41, no. 7 (2015): 553–61. http://dx.doi.org/10.1134/s1063780x15070028.

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Novikov, I. L., D. I. Vol’khin, and A. G. Vostretsov. "Cryogenic bipolar low noise dc amplifier for low frequency applications." Radiotehnika i èlektronika 69, no. 1 (2024): 88–98. http://dx.doi.org/10.31857/s0033849424010078.

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A low-noise bipolar differential dc amplifier was studied at temperatures of 300 and 77 K. It was shown that to ensure the best amplifier performance in terms of noise figure when the operating temperature decreases from 300 to 77 K, it is advisable to use the transistor in the mode of low currents not exceeding 2 mA. It has been established that lowering the operating temperature to 77 K leads to a decrease in the input resistance of the amplifier from a value of several kiloohms to 100 Ohms, the dynamic range increases from 80 to 85 dB, and the harmonic coefficient increases from 0.09% to 1%

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