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Artykuły w czasopismach na temat „Low-frequency pulse”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Wang, Can, Lilianna E. Christman, Simon L. Klemperer, Jonathan M. Glen, Darcy K. McPhee, and Bin Chen. "Assessment of a claimed ultra-low frequency electromagnetic (ULFEM) earthquake precursor." Geophysical Journal International 229, no. 3 (2021): 2081–95. http://dx.doi.org/10.1093/gji/ggab530.

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SUMMARY The rate of occurrence of anomalous ultra-low frequency electromagnetic (ULFEM) pulses has been claimed to have increased days to weeks prior to the M5.4 2007 and M4.0 2010 Alum Rock earthquakes. We re-examine the previously reported ultra-low frequency (ULF: 0.01–10 Hz) magnetic data recorded at a QuakeFinder site located 9 km from the earthquake hypocentre, and compare to data from a nearby Stanford-USGS site located 42 km from the hypocentre, to analyse the characteristics of the pulses and assess their origin. Using pulse definitions and pulse-counting algorithms analogous to those

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2

Jiang Pei-heng, Shi Chao-du, Fu Shi-jie та ін. "130 μJ linear-polarized single-frequency 12-μm-core Er/Yb co-doped fiber amplifier based on pre-shaped seed pulse". Acta Physica Sinica 74, № 2 (2025): 0. https://doi.org/10.7498/aps.74.20241371.

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Stimulated Brillouin scattering (SBS) is the major barrier in the process of energy scaling for pulsed single-frequency fiber MOPA. Due to gain saturation effect, the laser pulse profile will be gradually distorted with the increase of pump power, which induces steep leading edge and narrower width for the amplified pulses. The resulting laser peak power would increase rapidly and thus the SBS threshold is reached earlier to limit the amplification of pulse energy.<br>A method to obtain high-energy pulsed single-frequency laser by pulse pre-shaping is demonstrated in this work. By design

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3

Zhou, Guangqi, Ye Tian, Feng Shi, et al. "Low-Energy Pulsed Ion Beam Technology with Ultra-High Material Removal Resolution and Widely Adjustable Removal Efficiency." Micromachines 12, no. 11 (2021): 1370. http://dx.doi.org/10.3390/mi12111370.

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High-precision optical component manufacturing by ion beam machining tools with ultra-high material removal resolution and dynamically adjustable removal efficiency is important in various industries. In this paper, we propose a low-energy pulsed ion beam (LPIB) technology that can obtain a single pulse with high-resolution material removal by adjusting the pulse frequency and duty cycle, and enable the dynamic adjustment of the removal efficiency. The pulse frequency is 1–100 Hz, and the duty cycle is 0–100%. For monocrystalline silicon, the pulse frequency and duty cycle are set to 100 Hz an

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4

Peng Zhang, Peng Zhang, Xuechun Li Xuechun Li, Youen Jiang Youen Jiang, and Guoyang Li Guoyang Li. "Automatic polarization compensation method for low-repetition frequency short optical pulse." Chinese Optics Letters 10, no. 1 (2012): 010602–10605. http://dx.doi.org/10.3788/col201210.010602.

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Ma, Li Ping, Zhi Qiang Liang, Xi Bin Wang, Wen Xiang Zhao, Tian Feng Zhou, and Hong Min Yao. "Effect of Low-Frequency Pulsed Magnetic Treatment on Micro-Hardness of High Speed Steel." Advanced Materials Research 797 (September 2013): 663–66. http://dx.doi.org/10.4028/www.scientific.net/amr.797.663.

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The effect of low-frequency pulsed magnetic treatment on micro-hardness of W9Mo3Cr4V(W9) high speed steel (HSS) has been investigated. A low-frequency pulsed magnetic treatment system was designed and applied to treat the tool material. Experiments were conducted at different magnetic field intensities and pulse frequencies. Experimental results show that the low-frequency pulsed magnetic treatment can effectively increase the micro-hardness of W9 HSS in a proper treatment parameters. The micro-hardness change rate first increase and then stabilize as the magnetic field intensity increases. Pu

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6

Riemann, Stephanie, Cornelia Helbing, and Frank Angenstein. "From unspecific to adjusted, how the BOLD response in the rat hippocampus develops during consecutive stimulations." Journal of Cerebral Blood Flow & Metabolism 37, no. 2 (2016): 590–604. http://dx.doi.org/10.1177/0271678x16634715.

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To determine the possibility to deconvolve measured BOLD responses to neuronal signals, the rat perforant pathway was electrically stimulated with 10 related stimulation protocols. All stimulation protocols were composed of low-frequency pulse sequences with superimposed high-frequency pulse bursts. Because high-frequency pulse bursts trigger only one synchronized spiking of granular cells, variations of the stimulation protocol were used: (a) to keep the spiking activity similar during the presentation of different numbers of pulses, (b) to apply identical numbers of pulses to induce differen

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7

Jones, G. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. http://dx.doi.org/10.1242/jeb.202.23.3359.

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I investigated the scaling of echolocation call parameters (frequency, duration and repetition rate) in bats in a functional context. Low-duty-cycle bats operate with search phase cycles of usually less than 20 %. They process echoes in the time domain and are therefore intolerant of pulse-echo overlap. High-duty-cycle (&gt;30 %) species use Doppler shift compensation, and they separate pulse and echo in the frequency domain. Call frequency scales negatively with body mass in at least five bat families. Pulse duration scales positively with mass in low-duty-cycle quasi-constant-frequency (

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8

Wang, W. M., Z. M. Sheng, and J. Zhang. "Electron injection into laser wakefields by colliding circularly-polarized laser pulses." Laser and Particle Beams 27, no. 1 (2009): 3–7. http://dx.doi.org/10.1017/s0263034609000019.

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AbstractElectron injection into a laser wakefield by the colliding of two circularly polarized laser pulses is analyzed by the Hamiltonian approach and particle-in-cell simulations. If the pump pulse driving the laser wakefield is right-circularly-polarized, electron injection is found only when the counter-propagating injection pulse is left-circularly-polarized and vice versa. This holds when the injection pulse is at low intensity and has a frequency near the pump pulse frequency ω0. For a moderately intense injection pulse, even if the two pulses have the same polarization, electron inject

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9

Xie, Xiao Hua, Quan Zhou, Cheng Bo Xiao, and Xin Tang. "Effect of Low-Voltage Pulsed Magnetic Field on Solidified Structure of Superalloy K4169." Applied Mechanics and Materials 423-426 (September 2013): 725–29. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.725.

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Effects of different pulse voltage and frequency on solidified structure of superalloy K4169 under low-voltage pulsed magnetic field (LVPMF) were investigated in this paper, and the related mechanism was also discussed. The experimental results show that grain of superalloy K4169 can be refined greatly by LVPMF treatment during the course of solidification. Growth of dendrite is restrained and primary grain is changed from large dendrites to smaller equiaxed grains. When the pulse voltage is at 0-280V, grain size of the alloy decreases as pulse voltage increases, and primary dendrites are frac

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10

Jones, Gareth. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. https://doi.org/10.5281/zenodo.13474226.

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(Uploaded by Plazi for the Bat Literature Project) I investigated the scaling of echolocation call parameters pulses when detecting distant targets. There is probably a (frequency, duration and repetition rate) in bats in a trade-off between call intensity and repetition rate because functional context. Low-duty-cycle bats operate with 'whispering' bats (and hipposiderids) produce several calls search phase cycles of usually less than 20 %. They process per predicted wingbeat and because batches of calls are echoes in the time domain and are therefore intolerant of emitted per wingbeat during

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11

Jones, Gareth. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. https://doi.org/10.5281/zenodo.13474226.

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(Uploaded by Plazi for the Bat Literature Project) I investigated the scaling of echolocation call parameters pulses when detecting distant targets. There is probably a (frequency, duration and repetition rate) in bats in a trade-off between call intensity and repetition rate because functional context. Low-duty-cycle bats operate with 'whispering' bats (and hipposiderids) produce several calls search phase cycles of usually less than 20 %. They process per predicted wingbeat and because batches of calls are echoes in the time domain and are therefore intolerant of emitted per wingbeat during

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12

Jones, Gareth. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. https://doi.org/10.5281/zenodo.13474226.

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(Uploaded by Plazi for the Bat Literature Project) I investigated the scaling of echolocation call parameters pulses when detecting distant targets. There is probably a (frequency, duration and repetition rate) in bats in a trade-off between call intensity and repetition rate because functional context. Low-duty-cycle bats operate with 'whispering' bats (and hipposiderids) produce several calls search phase cycles of usually less than 20 %. They process per predicted wingbeat and because batches of calls are echoes in the time domain and are therefore intolerant of emitted per wingbeat during

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13

Jones, Gareth. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. https://doi.org/10.5281/zenodo.13474226.

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(Uploaded by Plazi for the Bat Literature Project) I investigated the scaling of echolocation call parameters pulses when detecting distant targets. There is probably a (frequency, duration and repetition rate) in bats in a trade-off between call intensity and repetition rate because functional context. Low-duty-cycle bats operate with 'whispering' bats (and hipposiderids) produce several calls search phase cycles of usually less than 20 %. They process per predicted wingbeat and because batches of calls are echoes in the time domain and are therefore intolerant of emitted per wingbeat during

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14

Jones, Gareth. "Scaling of echolocation call parameters in bats." Journal of Experimental Biology 202, no. 23 (1999): 3359–67. https://doi.org/10.5281/zenodo.13474226.

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(Uploaded by Plazi for the Bat Literature Project) I investigated the scaling of echolocation call parameters pulses when detecting distant targets. There is probably a (frequency, duration and repetition rate) in bats in a trade-off between call intensity and repetition rate because functional context. Low-duty-cycle bats operate with 'whispering' bats (and hipposiderids) produce several calls search phase cycles of usually less than 20 %. They process per predicted wingbeat and because batches of calls are echoes in the time domain and are therefore intolerant of emitted per wingbeat during

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15

Thomas, Christine K., Lisa Griffin, Sharlene Godfrey, Edith Ribot-Ciscar, and Jane E. Butler. "Fatigue of Paralyzed and Control Thenar Muscles Induced by Variable or Constant Frequency Stimulation." Journal of Neurophysiology 89, no. 4 (2003): 2055–64. http://dx.doi.org/10.1152/jn.01002.2002.

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Muscles paralyzed by chronic (>1 yr) spinal cord injury fatigue readily. Our aim was to evaluate whether the fatigability of paralyzed thenar muscles ( n = 10) could be reduced by the repeated delivery of variable versus constant frequency pulse trains. Fatigue was induced in four ways. Intermittent supramaximal median nerve stimulation (300-ms-duration trains) was delivered at 1) constant high frequency (13 pulses at 40 Hz each second for 2 min); 2) variable high frequency (each second for 2 min). The first two intervals of each variable frequency train were 5 and 20 ms. The remaining puls

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16

Altaher, Ali Salem, Hanqi Zhuang, Ali K. Ibrahim, et al. "Detection and localization of Goliath grouper using their low-frequency pulse sounds." Journal of the Acoustical Society of America 153, no. 4 (2023): 2190–202. http://dx.doi.org/10.1121/10.0017804.

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The goal of this paper is to implement and deploy an automated detector and localization model to locate underwater marine organisms using their low-frequency pulse sounds. This model is based on time difference of arrival (TDOA) and uses a two-stage approach, first, to identify the sound and, second, to localize it. In the first stage, an adaptive matched filter (MF) is designed and implemented to detect and determine the timing of the sound pulses recorded by the hydrophones. The adaptive MF measures the signal and noise levels to determine an adaptive threshold for the pulse detection. In t

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17

War, War Naing. "Configuration and Control of Cycloconverter for Low Frequency AC Transmission System in 500Kv Transmission Line." International Journal of Advances in Scientific Research and Engineering (ijasre) 5, no. 11 (2019): 1–7. https://doi.org/10.31695/IJASRE.2019.33585.

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<em>Today, the highest voltage level of the AC power transmission line is 500kV in Myanmar. The highest voltage level encounters the difficulties of the material and environment issues.  If it is a long-distance transmission, its power losses and voltage regulation are increasing. High voltage 50Hz AC transmission system has many limitations, so a high voltage Low-Frequency AC (LFAC) transmission system has been proposed as a new alternative technology for transmission of power between Meikhtila and Taungoo transmission system. The low-frequency AC transmission system is the 500kV transmi

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18

Di, Xiao, and Kenneth E. Gilbert. "Low‐frequency pulse propagation over irregular terrain." Journal of the Acoustical Society of America 120, no. 5 (2006): 3340. http://dx.doi.org/10.1121/1.4781332.

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19

Zaslavskii, A. Yu, and G. S. Markarov. "The INFITA low-frequency pulse physiotherapeutic device." Biomedical Engineering 28, no. 5 (1994): 284–87. http://dx.doi.org/10.1007/bf00556695.

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20

Голуб, В. С. "New pulse modulator with low switching frequency." Технология и конструирование в электронной аппаратуре, no. 5-6 (December 2014): 10–14. http://dx.doi.org/10.15222/tkea2014.2.10.

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21

Wang, Juntao, Yuanyuan Qi, Junchao Lu, Xiaodong Li, and Junfei Wang. "Optimization of high-power Er/Yb co-doped fiber amplifiers for dual-band pulse amplification." Modern Physics Letters B 32, no. 22 (2018): 1850263. http://dx.doi.org/10.1142/s0217984918502639.

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In this paper, high-power pulse-pumped erbium–ytterbium co-doped fiber amplifiers (EYDFAs) for simultaneous amplification of low-repetition rate pulses in the 1.0 [Formula: see text]m and 1.5 [Formula: see text]m bands are numerically investigated. The influences of the peak power and pulse-width of the pump and time delay between the pump and signal pulses on the performance of the amplifier are systematically analyzed. The results show that a pulse-pumped EYDFA is capable of simultaneously amplifying dual-band pulses. The optimal pulse-width of the pump is mainly determined by the allowable

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22

Gao, Mingwei, Yibo Ding, Qing Wang, Lei Wang, Yuan Gao, and Chunqing Gao. "Low-Timing Jitter Single-Frequency Pulse Output from a Passively Q-Switched Monolithic Non-Planar Ring Oscillator." Photonics 11, no. 12 (2024): 1120. http://dx.doi.org/10.3390/photonics11121120.

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A low-timing jitter passively Q-switched monolithic non-planar ring oscillator (NPRO) with diffusion-bonded Cr4+: YAG in a single-frequency operation was realized. The pulse parameters were controlled by a Cr4+: YAG saturable absorber, while the single-frequency operation was ensured by the unidirectional ring cavity structure. The pulse trigger was actively provided by a gain switcher utilizing a composite pumping scheme. The dependence of the timing jitter between the output pulse and the trigger signal on the parameters of the composite pumping scheme was investigated both theoretically and

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23

Creech, Charles J., Jasmine M. Hope, Anastasia Zarkou, and Edelle C. Field-Fote. "Optimizing assessment of low frequency H-reflex depression in persons with spinal cord injury." PLOS ONE 19, no. 5 (2024): e0300053. http://dx.doi.org/10.1371/journal.pone.0300053.

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Considering the growing interest in clinical applications of neuromodulation, assessing effects of various modulatory approaches is increasingly important. Monosynaptic spinal reflexes undergo depression following repeated activation, offering a means to quantify neuromodulatory influences. Following spinal cord injury (SCI), changes in reflex modulation are associated with spasticity and impaired motor control. To assess disrupted reflex modulation, low-frequency depression (LFD) of Hoffman (H)-reflex excitability is examined, wherein the amplitudes of conditioned reflexes are compared to an

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24

Erni, Yudaningtyas, Khabib Achsanul, Djuriatno Waru, Amalia Zakiyah, and Kurniawan Subroto Ramadhani. "Low-frequency response test device of electret condenser microphone." TELKOMNIKA Telecommunication, Computing, Electronics and Control 18, no. 3 (2020): 1368–75. https://doi.org/10.12928/TELKOMNIKA.v18i3.14831.

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Arterial pulse measurement using electret condenser microphone requires the standard to validate the value of the measurement. This standard requires the test device to reproducing the mechanical vibration to emulate the arterial pulse vibration. The main objective of this paper is to discuss the test device of electret condenser microphone using class A amplifiers and low-frequency loudspeaker. To validate this pulse measurement, this class A amplifier is examined under an experimental setup. The experiments showed that the device can be used as an alternative solution to generate the mechani

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25

Yao, Ruixuan, Yasushi Takemura, and Tsuyoshi Uchiyama. "High precision MI sensor with low energy consumption driven by low-frequency Wiegand pulse." AIP Advances 13, no. 2 (2023): 025201. http://dx.doi.org/10.1063/9.0000374.

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This study introduces a new method to drive high-precision magneto-impedance (MI) sensors with low power consumption using a Wiegand sensor to replace the oscillator circuits of the MI sensor. We studied the characteristics of an MI sensor driven by low-frequency pulses and concluded that pulses with a fast rise time and small excitation current are necessary to induce a significant MI effect. The Wiegand sensor induced 10 Hz low-frequency pulse voltages of approximately 12 V and a constant width of 20 μs when an alternating magnetic field of 5 mT/ μ0 alternating magnetic field was applied. A

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26

Kuzmin, Arkady. "Scattering of the Low Frequency Pulsar Radiation." International Astronomical Union Colloquium 182 (2001): 53–56. http://dx.doi.org/10.1017/s0252921100000683.

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AbstractWe report the results of the measurements and analysis of the pulse broadening due to interstellar scattering on 43 pulsars at 102 MHz. This is the largest uniform sample of direct measurements of pulsar scattering τsc, which make it feasible to analyze the dependence of this value on other pulsar parameters. The measured dependence of τsc on dispersion measure τsc(DM) = 40(DM /100)2.1 is close to theoretically expected relation τsc(DM) α DM2. A frequency dependence of the scattering pulse broadening is weaker than commonly accepted τsc α v−4.4.

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Stevenson, Cagla, James P. J. Hall, Michael A. Brockhurst, and Ellie Harrison. "Plasmid stability is enhanced by higher-frequency pulses of positive selection." Proceedings of the Royal Society B: Biological Sciences 285, no. 1870 (2018): 20172497. http://dx.doi.org/10.1098/rspb.2017.2497.

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Plasmids accelerate bacterial adaptation by sharing ecologically important traits between lineages. However, explaining plasmid stability in bacterial populations is challenging owing to their associated costs. Previous theoretical and experimental studies suggest that pulsed positive selection may explain plasmid stability by favouring gene mobility and promoting compensatory evolution to ameliorate plasmid cost. Here we test how the frequency of pulsed positive selection affected the dynamics of a mercury-resistance plasmid, pQBR103, in experimental populations of Pseudomonas fluorescens SBW

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28

Xiao, Zeng Li, Jun Bin Chen, and Wen Long Qin. "Experiment of Driving Oil by Low Frequency Hydraulic Pulse of Low Permeability Reservoirs." Applied Mechanics and Materials 675-677 (October 2014): 1490–94. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.1490.

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The fine grain, poor sorting and high cement content in low permeability reservoirs lead to poor reservoir property, low porosity and permeability and have strong damage to the reservoir .The conventional way of low permeability oil mining is mainly fracture and chemical flooding, which cost is relatively high and will cause serious irreparable damage to formation. People are in favor of physical oil production technology because it is no harm and pollution to the reservoir, more flexible to operate and it has wide range of application and low cost. By using high frequency pulse pressure servo

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Akhyani, Mina, Henrik M. Rϕnnow, and Luca Zanini. "A high brilliance low-frequency spallation source optimized for one single instrument." EPJ Web of Conferences 298 (2024): 05001. http://dx.doi.org/10.1051/epjconf/202429805001.

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Conducting neutron scattering experiments in the presence of high pulsed magnetic fields provides valuable information about the magnetic structures of materials. However, these experiments are challenging and time-consuming because the neutron count is typically low, due to the asynchronization between the neutron and magnetic pulses. In this paper we investigate the idea of having an optimized dedicated source, i.e. a second target station at the European Spallation Source (ESS). This involves extracting protons from the same linear accelerator (linac) as the first target, synchronizing thei

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Rozina Ch. and Maryam N. "Low frequency Compressional modes in degenerate semiconductor plasmas." Semiconductors 56, no. 6 (2022): 373. http://dx.doi.org/10.21883/sc.2022.06.53532.9621a.

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Properties of low frequency compressional electromagnetic wave pulse in a magnetized semiconductor hole-electron plasma, are investigated. The quantum mechanical effects such as Fermi pressure, quantum tunneling and exchange-correlation potential of inertialess electrons, inertial holes and stationary charged ion particulates are considered in the presence of the magnetic field. A new type of dispersion relation is derived for low-frequency compressional waves by employing quantum magneto-hydrodynamic model and Maxwell equations; the dispersion relation is then analyzed for parallel, perpendic

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31

Michilli, D., J. W. T. Hessels, J. Y. Donner, et al. "Evolution of the low-frequency pulse profile of PSR B2217+47." Proceedings of the International Astronomical Union 13, S337 (2017): 291–94. http://dx.doi.org/10.1017/s1743921317010006.

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AbstractAn evolution of the low-frequency pulse profile of PSR B2217+47 is observed during a six-year observing campaign with the LOFAR telescope at 150 MHz. The evolution is manifested as a new component in the profile trailing the main peak. The leading part of the profile, including a newly-observed weak component, is steady during the campaign. The transient component is not visible in simultaneous observations at 1500 MHz using the Lovell telescope, implying a chromatic effect. A variation in the dispersion measure of the source is detected in the same timespan. Precession of the pulsar a

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Romantsov, V. N., S. V. Romantsov, and N. V. Romantsova. "Frequency Response Extension of a Pulsed Magnetic Field Meter Based on an RL Integrator." Journal of the Russian Universities. Radioelectronics 26, no. 1 (2023): 99–112. http://dx.doi.org/10.32603/1993-8985-2023-26-1-99-112.

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Introduction. Measurements of the amplitude-time characteristics of pulsed magnetic fields are required in various research and technology areas. Such measurements are carried out during pulsed magnetic field immunity testing, with the magnetic field pulse rise time being hundreds of ns, and the pulse duration to its half initial value (halfdroop) being hundreds of µs.Aim. To develop a meter of magnetic field strength with a linear conversion characteristic for measuring the pulse rise time, the pulse duration to its half-droop, and the peak value of the pulsed magnetic field strength.Material

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Yan, Mu Tian, Yi Ting Liu, and Guan Ren Fang. "A Study on Pulse Generator for Micro WEDM of Polycrystalline Diamond." Key Engineering Materials 516 (June 2012): 498–503. http://dx.doi.org/10.4028/www.scientific.net/kem.516.498.

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This paper presents a new pulse generator for cutting of polycrystalline diamond (PCD) by micro wire-EDM. Three pulse control methods (AC power supply pulse control method, fixed pulse width modulation pulse control method and improved AC power supply pulse control method) have been proposed to achieve high frequency and low energy discharge pulses. The improved AC power supply pulse control method enables the pulse generator to provide a period of 20 μs off duty cycle followed by a period of duty cycle for reionization of the dielectric in the spark. Compared to the other two methods, the imp

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Asadipour, Kamal, Carol Zhou, Vincent Yi, Stephen J. Beebe, and Shu Xiao. "Ultra-Low Intensity Post-Pulse Affects Cellular Responses Caused by Nanosecond Pulsed Electric Fields." Bioengineering 10, no. 9 (2023): 1069. http://dx.doi.org/10.3390/bioengineering10091069.

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High-intensity nanosecond pulse electric fields (nsPEF) can preferentially induce various effects, most notably regulated cell death and tumor elimination. These effects have almost exclusively been shown to be associated with nsPEF waveforms defined by pulse duration, rise time, amplitude (electric field), and pulse number. Other factors, such as low-intensity post-pulse waveform, have been completely overlooked. In this study, we show that post-pulse waveforms can alter the cell responses produced by the primary pulse waveform and can even elicit unique cellular responses, despite the primar

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35

Zheng Zhongkai, 郑忠楷, 罗志灶 Luo Zhizao, and 周赢武 Zhou Yingwu. "The Design of LD Low Frequency Pulse Pump." APPLIED LASER 31, no. 3 (2011): 258–61. http://dx.doi.org/10.3788/al20113103.0258.

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Albert, Donald G., Michelle E. Swearingen, Frank E. Perron, and David L. Carbee. "Low frequency acoustic pulse propagation in temperate forests." Journal of the Acoustical Society of America 138, no. 2 (2015): 735–47. http://dx.doi.org/10.1121/1.4923365.

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Xu, Chao, and Lei Yang. "Conductivity Variation during Irreversible Electroporation." E3S Web of Conferences 271 (2021): 01032. http://dx.doi.org/10.1051/e3sconf/202127101032.

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Irreversible electroporation (IRE) is an emerging tumour ablation technique, which utilizes non thermoelectric pulse to ablate tumours. Compared with the common tumour treatment methods, e.g., surgery, chemotherapy and radiotherapy, IRE has advantages of short action time, no massive bleeding of tissue during ablation, avoiding heat sink effect, etc. However, the process of IRE will be affected by the distribution of E-field of the tissue. The major factors which affect E-field distribution are parameters of the electrical pulse and characteristics of the tissue, e.g., the conductivity of the

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Okawa, H., and T. Akitsu. "Material conformity and bactericidal properties of high-frequency-pulse-modulated and low-frequency-pulse-excited plasmas." IOP Conference Series: Materials Science and Engineering 369 (May 2018): 012026. http://dx.doi.org/10.1088/1757-899x/369/1/012026.

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Petrovich, V. I. "Frequency multiplier with pulse feedback for low-frequency digital measuring instruments." Measurement Techniques 28, no. 10 (1985): 831–33. http://dx.doi.org/10.1007/bf00861752.

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Chuvaev, I. V., Zh S. Вudnik, and A. V. Yashin. "Characteristics of electromagnetic radiation of the veterinary physiotherapy device UMI-05-V." International Journal of Veterinary Medicine, no. 2 (June 28, 2024): 393–99. http://dx.doi.org/10.52419/issn2072-2419.2024.2.393.

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We studied some physical characteristics of the veterinary physiotherapeutic device UMI-V-05. The magnetic induction at different power levels was determined using TPU 02 militeslameter. The magnetic induction was measured for each power value. The probe of the milliteslameter was placed directly on the working surface, in the center of the inductor. It was found that the minimum magnetic induction of the device is 350±6.0 mTl, and the maximum is 1058±10.0 mTl. During the device operation, the heating of the inductor was determined using a thermal imager and a stopwatch. During the recommended

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Van Cauter, E. "Estimating false-positive and false-negative errors in analyses of hormonal pulsatility." American Journal of Physiology-Endocrinology and Metabolism 254, no. 6 (1988): E786—E794. http://dx.doi.org/10.1152/ajpendo.1988.254.6.e786.

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Previous studies evaluating computer algorithms for endocrine pulse detection have estimated the rate of false-positive pulses in series of purely random variations (i.e., “noise”) and have determined pulse-detection criteria associated with low levels of such false-positive rates. The present study investigates the relationship between the false-positive rate and the sizes of the false-positive and false-negative errors on pulse frequency for series including both pulses and noise. The algorithm used (ULTRA) proceeds by eliminating all peaks of concentration for which either the increment or

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Xu, Fan, G. E. Anderson, Jun Tian, et al. "A Search for Low-frequency Radio Pulses from Long Gamma-Ray Bursts with the Murchison Widefield Array." Astrophysical Journal 982, no. 1 (2025): 32. https://doi.org/10.3847/1538-4357/adb71e.

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Abstract It has been proposed that coherent radio emission could be emitted during or shortly following a gamma-ray burst (GRB). Here we present a low-frequency (170–200 MHz) search for radio pulses associated with long-duration GRBs using the Murchison Widefield Array (MWA). The MWA, with its rapid-response system, is capable of performing GRB follow-up observations within approximately 30 s. Our single pulse search, with temporal and spectral resolutions of 100 μs and 10 kHz, covers dispersion measures up to 5000 pc cm−3. Two single pulse candidates are identified with significance greater t

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Tantavichet, Nisit, and Mark D. Pritzker. "Low- and High-Frequency Pulse Current and Pulse Reverse Plating of Copper." Journal of The Electrochemical Society 150, no. 10 (2003): C665. http://dx.doi.org/10.1149/1.1602457.

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Khorasani, Amir, Seyed Mohammad Firoozabadi, and Zeinab Shankayi. "Conductivity change with needle electrode during high frequency irreversible electroporation: a finite element study." Polish Journal of Medical Physics and Engineering 25, no. 4 (2019): 237–42. http://dx.doi.org/10.2478/pjmpe-2019-0031.

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Abstract Irreversible electroporation (IRE) is a process in which the cell membrane is damaged and leads to cell death. IRE has been used as a minimally invasive ablation tool. This process is affected by some factors. The most important factor is the electric field distribution inside the tissue. The electric field distribution depends on the electric pulse parameters and tissue properties, such as the electrical conductivity of tissue. The present study focuses on evaluating the tissue conductivity change due to high-frequency and low-voltage (HFLV) as well as low-frequency and high-voltage

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Zakharchenko, Vladimir, and Alexander Khoperskov. "Scheme features of radio pulse gating for radar measurements." ITM Web of Conferences 30 (2019): 11011. http://dx.doi.org/10.1051/itmconf/20193011011.

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The model of a radio pulse stroboscopic converter consisting of a mixer and a narrowband filter tuned to the difference frequency of the carrier signals is considered. We demonstrate that the measurement of the phase structure of the input signals can be made at low frequency by amplitude methods by changing the phase both in the channel of the gating radio pulses and in the low frequency channel. The radio-pulse gating scheme goes into a phase-sensitive mode when the system clock frequency is synchronized with the second harmonic of the difference frequency, however, in this case, a parasitic

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Lu, Kailiang, Xiu Li, Jianhua Yue, Ya’nan Fan, Qinrun Yang, and Xiaozhen Teng. "The Multi-Resolution Migration Imaging Method for Grounded Electrical Source Transient Electromagnetic Virtual Wavefield." Applied Sciences 15, no. 3 (2025): 1107. https://doi.org/10.3390/app15031107.

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The traditional source uses a square wave with a fixed fundamental frequency to excite transient electromagnetic (TEM) fields, with harmonic energy primarily concentrated in the low-frequency range, limiting the detection resolution of the TEM. The differential pulse, composed of two square waves with identical pulse widths but opposite polarities, concentrates harmonic energy more effectively. By adjusting the pulse width of the differential pulse, the concentration frequency band of harmonic energy can be changed, enabling multi-resolution detection of geological structures at different dept

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Zhan, Haihong, Tao Wang, Tai Guo, and Xingde Su. "An Anti-Intermittent Sampling Jamming Technique Utilizing the OTSU Algorithm of Random Orthogonal Sub-Pulses." Remote Sensing 15, no. 12 (2023): 3080. http://dx.doi.org/10.3390/rs15123080.

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The utilization of intermittent sampling jamming can engender a lofty verisimilitude false target cluster that exhibits coherence with the transmitted signal. Such an assemblage bears the hallmarks of both suppression jamming and deceitful jamming, capable of inflicting substantial impairment upon the radar, potentially leading to its profound incapacitation. Henceforth, the precise discernment of the target and various forms of intermittent sampling jamming emerges as a novel endeavor. In response to this predicament, this paper posits a pulsed radar waveform featuring intra-pulse random orth

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Kloepper, Laura N., Andrea Megela Simmons, James A. Simmons, and Michael Smotherman. "Echolocation while drinking: Pulse-timing strategies by high- and low-frequency FM bats." PLOS ONE 14, no. 12 (2019): e0226114. https://doi.org/10.5281/zenodo.13447823.

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(Uploaded by Plazi for the Bat Literature Project) During nightly foraging activity, echolocating bats drink by flying low over the water surface and dipping the lower jaw while avoiding further bodily contact with the water. This task poses different sensorimotor challenges than flying in the open to forage for insects. Of interest is how bats adjust the timing of their echolocation pulses to accommodate the surrounding scene, from the progressively nearer water surface itself to objects at longer distances. Drinking behavior has been described in only a few of the roughly 1,000 echolocating

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Kloepper, Laura N., Andrea Megela Simmons, James A. Simmons, and Michael Smotherman. "Echolocation while drinking: Pulse-timing strategies by high- and low-frequency FM bats." PLOS ONE 14, no. 12 (2019): e0226114. https://doi.org/10.5281/zenodo.13447823.

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(Uploaded by Plazi for the Bat Literature Project) During nightly foraging activity, echolocating bats drink by flying low over the water surface and dipping the lower jaw while avoiding further bodily contact with the water. This task poses different sensorimotor challenges than flying in the open to forage for insects. Of interest is how bats adjust the timing of their echolocation pulses to accommodate the surrounding scene, from the progressively nearer water surface itself to objects at longer distances. Drinking behavior has been described in only a few of the roughly 1,000 echolocating

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Kloepper, Laura N., Andrea Megela Simmons, James A. Simmons, and Michael Smotherman. "Echolocation while drinking: Pulse-timing strategies by high- and low-frequency FM bats." PLOS ONE 14, no. 12 (2019): e0226114. https://doi.org/10.5281/zenodo.13447823.

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(Uploaded by Plazi for the Bat Literature Project) During nightly foraging activity, echolocating bats drink by flying low over the water surface and dipping the lower jaw while avoiding further bodily contact with the water. This task poses different sensorimotor challenges than flying in the open to forage for insects. Of interest is how bats adjust the timing of their echolocation pulses to accommodate the surrounding scene, from the progressively nearer water surface itself to objects at longer distances. Drinking behavior has been described in only a few of the roughly 1,000 echolocating

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