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Journal articles on the topic 'Maximum pulse frequency'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

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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2

Luiker, Eric A., and E. Don Stevens. "Effect of stimulus frequency and duty cycle on force and work in fish muscle." Canadian Journal of Zoology 70, no. 6 (1992): 1135–39. http://dx.doi.org/10.1139/z92-159.

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Stimulus trains of varying pulse number and pulse frequency were applied to the isolated pectoral adductor muscle of the sunfish Lepomis gibbosus. The number of pulses varied from 1 to 70, and the pulse frequency varied from 10 to 500 Hz. Muscle was continuously cycled at 2 Hz, and work was measured directly. Maximum force (177 kN/m2) was achieved with a train of 30 pulses at 169 Hz. Maximum work of 9.1 J/kg (power of 18.2 W/kg) was achieved with a train of 30 pulses at 169 Hz and a duty cycle (fraction of the cycle during which the muscle is activated) of 35%. Work values increased with an in

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Ling, Yuanfei, Xiaoqiang Wang, and Jiren Tang. "Dynamic Simulation Model and Performance Optimization of a Pressurized Pulsed Water Jet Device." Applied Sciences 14, no. 15 (2024): 6788. http://dx.doi.org/10.3390/app14156788.

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Pulsed water jet technology has broad application prospects in the field of rock breaking. The pressurized pulsed water jet (PPWJ) is a new type of pulsed jet that offers high-amplitude pressurization, variable pulse pressure and frequency, and a high energy usage rate. To achieve a more destructive and powerful pulsed water jet, a dynamic simulation model of the device was established by using the AMESim software (v1400) based on the operational principle of PPWJs, and the simulation model was validated against the experimental results. The relationships between the key structural parameters

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4

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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5

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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Wang, Yong, Hongjian Ni, Ruihe Wang, et al. "Effect of Pulsed Jet on Pore Pressure of Deep Formation Rock." Shock and Vibration 2021 (December 29, 2021): 1–9. http://dx.doi.org/10.1155/2021/2217787.

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Pulsed jet significantly affects the pore pressure of deep formation and then affects the mechanical ROP. In this paper, the effect of jet pulsation on deep pore pressure in the formation is studied by the finite element method. Under the pulsed jet, the maximum relative negative pressure is along the wellbore axis, and the farther it is to the borehole axis, the smaller the relative negative pressure is. With the increase of pulse frequency, the relative negative pressure increases and the maximum point of relative negative pressure moves upward. The optimum pulse frequency is from 50 Hz to 5

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7

Zhang, Jiale, Jian Ma, Tingting Lu, and Xiaolei Zhu. "486 nm pulsed Nd:YLF laser with intracavity sum-frequency mixing." Laser Physics Letters 20, no. 5 (2023): 055001. http://dx.doi.org/10.1088/1612-202x/accf77.

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Abstract An intracavity sum-frequency pulsed laser emitting at 486 nm was demonstrated in a combined cavity for two electro-optically Q-switched Nd:YLF fundamental lasers emitting at 908 nm and 1047 nm respectively. Pumped by two 806 nm LDs at 50 Hz repetition rate, while the intracavity pulse energy reached 6.25 mJ at 908 nm and 2.57 mJ at 1047 nm, maximum output pulse energy of 0.26 mJ at 486.4 nm wavelength was successfully achieved by intracavity sum-frequency. The corresponding spectral bandwidth was less than 0.08 nm, and the pulse width was about 11.8 ns. The peak power of the blue lase

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Danilov, V. N. "ON THE INFLUENCE OF THE PARAMETERS OF THE ELECTRIC EXCITATION PULSE OF A PIEZOELECTRIC PLATE OF A NORMAL PROBE ON THE CHARACTERISTICS OF THE FREQUENCY SPECTRUM AND PULSE OF THE RECORDED ECHO SIGNAL." Kontrol'. Diagnostika, no. 291 (September 2022): 14–22. http://dx.doi.org/10.14489/td.2022.09.pp.014-022.

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On the basis of computer modeling of the electro acoustic channel of a normal probe for a reflector in the form of a bottom surface, the influence of some typical forms and corresponding frequency spectra of the electric pulse of excitation of the piezoelectric plate on the characteristics of the frequency spectrum and pulse of the recorded echo signal is considered. Calculations of signals using an exciting pulse in the form of a voltage jump (step), in the form of half a sine wave and a rectangular shape have shown the feasibility of using rectangular pulses with a duration equal to half of

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9

Moriizumi, Takenori. "Ultrasonic imaging system capable of varying maximum pulse repetition frequency depending upon pulse transmission frequency." Journal of the Acoustical Society of America 97, no. 2 (1995): 1369. http://dx.doi.org/10.1121/1.412115.

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10

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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11

Kurniati, Hellen, Amir Hamidy, and Lynn Clayton. "Unusual call characteristics and acoustic niche adaptation of Limnonectes larvaepartus Iskandar, Evans & Mcguire, 2014 in its habitat (Anura: Dicroglossidae)." BIO Web of Conferences 19 (2020): 00006. http://dx.doi.org/10.1051/bioconf/20201900006.

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The advertisement call of Limnonectes larvaepartus is unique among frogs of the genus Limnonectes which have a true acoustic organ. The calls of three adult males L. larvaepartus were recorded at the foothill of Hutadelita Mountain (N 000 48’ 48.3” E 1220 23’ 00.8”; 396 m asl), Nantu Wildlife Sanctuary, Gorontalo, northern Sulawesi by using an Olympus LS-11 recorder with built-in microphones. Air temperature during recording was around 26°C. Adobe Audition 3.0 software was used to visualize and analyze the calls. The advertisement calls consist of 1-6 pulses, though only one pulse is usually p

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Wang, Yangguang, Guoqin Huang, Yanfang Su, Meiqin Zhang, Zhen Tong, and Changcai Cui. "Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools." Metals 9, no. 5 (2019): 612. http://dx.doi.org/10.3390/met9050612.

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A 3D finite element (FE) model is built to numerically analyze heating parameters on temperature during brazing diamond grains by the pulsed laser spot heating. A pulsed Nd:YAG laser is used for experimental validation. The results show that during laser heating, the temperature varies periodically because of the pulsed heat flux. Four key thermal indices, the maximum temperature Tmax, the minimum temperature Tmin, the average temperature Tav and the temperature fluctuation amplitude ΔT are addressed. The primary factor affecting Tmax, ΔT and Tav is the pulse power and on Tmin is the pulse fre

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13

Volkov, Aleksey A. "Parameters of the electric strength of air in a surface antenna during the emission of an ultrahigh-frequency pulse with a trapezoidal envelope." Physics of Wave Processes and Radio Systems 23, no. 3 (2020): 62–67. http://dx.doi.org/10.18469/1810-3189.2020.23.3.62-67.

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On the basis of the breakdown criterion and the equation of continuity of electrons in air, the amplitude and energy parameters of the electric strength of air in the surface antenna of a powerful microwave relativistic generator are determined when pulses are emitted with a trapezoidal envelope. Triangular and rectangular envelopes were considered as boundary cases of a trapezoidal envelope. The dependence of the parameters of electric strength on the shape of the envelope has been established. The calculation of the dependences of the breakdown field and the maximum permissible energy in a f

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14

Hsieh, Hung-I., Sheng-Fang Shih, Jen-Hao Hsieh, and Chi-Hao Wang. "Photovoltaic High-Frequency Pulse Charger for Lead-Acid Battery under Maximum Power Point Tracking." International Journal of Photoenergy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/687693.

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A photovoltaic pulse charger (PV-PC) using high-frequency pulse train for charging lead-acid battery (LAB) is proposed not only to explore the charging behavior with maximum power point tracking (MPPT) but also to delay sulfating crystallization on the electrode pores of the LAB to prolong the battery life, which is achieved due to a brief pulse break between adjacent pulses that refreshes the discharging of LAB. Maximum energy transfer between the PV module and a boost current converter (BCC) is modeled to maximize the charging energy for LAB under different solar insolation. A duty control,

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15

Ivanenko, A. V., A. E. Bednyakova, S. V. Smirnov, and A. A. Rybak. "Wavelength-tunable high-repetition-rate pulse generation in a SOA-based fiber laser with gain instability." Laser Physics Letters 21, no. 12 (2024): 125005. http://dx.doi.org/10.1088/1612-202x/ad8cc3.

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Abstract Introducing negative optical feedback into a semiconductor optical amplifier-based laser presents a straightforward and effective approach for generating high-repetition-rate pulses through the mechanism of self-sustaining cross-gain modulation. In this work, we demonstrate, for the first time, the tunability of high-frequency pulse generation over a wide wavelength range by adjusting the central transmission wavelength of a tunable filter. Our laser system achieved a full tuning range from 1480 nm to 1556 nm (76 nm) while maintaining pulsed lasing. Remarkably, the laser exhibited a m

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16

Gostyuhina, А. А., М. А. Bolshakov, А. V. Samoylova, et al. "Stimulation of Mesenchymal Stem Cells Proliferation from the Femur of Wistar Rats by Nanosecond Microwave Radiation: Dependence on the Number of Pulses." Радиационная биология. Радиоэкология 63, no. 1 (2023): 80–86. http://dx.doi.org/10.31857/s0869803123010083.

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The effect of nanosecond repetitively pulsed microwave radiation (RPM, 50–4000 pulses, pulse repetition rate of 13 Hz, peak power flux density of 140 W/cm2, carrier frequency of 10 GHz) on the stimulation of me-senchymal stem cells (MSC) proliferation was studied. The effect of exposure was assessed by the change in the number of cells in the culture after a single irradiation with a different number of pulses. The most pronounced effect exerted by the impact with 100 and 50 pulses, and the effect is realized with a maximum speed after 24 hours.

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17

Astapenko, Valeriy Alexandrovich, Frank Bernhard Rosmej, and Egor Sergeevich Khramov. "Time Dependence of Ultra-Short Laser Pulses Scattering by Atom in High Frequency Limit." Atoms 8, no. 3 (2020): 41. http://dx.doi.org/10.3390/atoms8030041.

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We investigated theoretically the time dependence of ultra-short laser pulse scattering by an atom at the high-frequency limit for the spectral and total probability of the process using new expression which we derived in this paper. We established that the time dependence of spectral scattering is presented by the curve with the maximum for sufficiently large detuning of scattering frequency from the carrier frequency of the pulse, while the total scattering probability is always the monotonically increasing function of time. We also studied the dependence of scattering probability on pulse d

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Stauskis, Vytautas. "PULSE LENGTH DEPENDENCE ON THE DECAY OF THE INTEGRATED PULSE ENERGY/INTEGRUOTO IMPULSO ENERGIJOS SLOPIMO PRIKLAUSOMYBĖ NUO SKIRTINGŲ IMPULSO ILGIŲ." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 6, no. 3 (2000): 206–12. http://dx.doi.org/10.3846/13921525.2000.10531588.

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The paper deals with the influence of the pulse length on the decay of the sound field energy. Six pulse lengths— 2000, 2500, 3000, 3500, 4000 and 4500 ms—were selected for investigations. Investigations show that a 2500 ms pulse is too short to correctly assess the background noise time interval. Such pulse length is not suitable for experiments. 3000 ms is the right length, while 3500 ms may be too long, resulting in errors of measurement results. When the pulse length increases to 4000 ms, the decay starting from 2000 ms is different from the pulse length 2500 ms and 3000 ms. Background noi

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19

Pirc, Eva, Damijan Miklavčič, Katja Uršič, Gregor Serša, and Matej Reberšek. "High-Frequency and High-Voltage Asymmetric Bipolar Pulse Generator for Electroporation Based Technologies and Therapies." Electronics 10, no. 10 (2021): 1203. http://dx.doi.org/10.3390/electronics10101203.

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Currently, in high-frequency electroporation, much progress has been made but limited to research groups with custom-made laboratory prototype electroporators. According to the review of electroporators and economic evaluations, there is still an area of pulse parameters that needs to be investigated. The development of an asymmetric bipolar pulse generator with a maximum voltage of 4 kV and minimum duration time of a few hundred nanoseconds, would enable in vivo evaluation of biological effects of high-frequency electroporation pulses. Herein, from a series of most commonly used drivers and o

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Hiryu, Shizuko, Tomotaka Hagino, Emyo Fujioka, Hiroshi Riquimaroux, and Yoshiaki Watanabe. "Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field." Journal of the Acoustical Society of America 124, no. 2 (2008): EL51—EL56. https://doi.org/10.5281/zenodo.13446460.

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(Uploaded by Plazi for the Bat Literature Project) Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9 – 11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is conclude

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Hiryu, Shizuko, Tomotaka Hagino, Emyo Fujioka, Hiroshi Riquimaroux, and Yoshiaki Watanabe. "Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field." Journal of the Acoustical Society of America 124, no. 2 (2008): EL51—EL56. https://doi.org/10.5281/zenodo.13446460.

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(Uploaded by Plazi for the Bat Literature Project) Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9 – 11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is conclude

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Hiryu, Shizuko, Tomotaka Hagino, Emyo Fujioka, Hiroshi Riquimaroux, and Yoshiaki Watanabe. "Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field." Journal of the Acoustical Society of America 124, no. 2 (2008): EL51—EL56. https://doi.org/10.5281/zenodo.13446460.

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(Uploaded by Plazi for the Bat Literature Project) Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9 – 11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is conclude

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23

Hiryu, Shizuko, Tomotaka Hagino, Emyo Fujioka, Hiroshi Riquimaroux, and Yoshiaki Watanabe. "Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field." Journal of the Acoustical Society of America 124, no. 2 (2008): EL51—EL56. https://doi.org/10.5281/zenodo.13446460.

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(Uploaded by Plazi for the Bat Literature Project) Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9 – 11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is conclude

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Hiryu, Shizuko, Tomotaka Hagino, Emyo Fujioka, Hiroshi Riquimaroux, and Yoshiaki Watanabe. "Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field." Journal of the Acoustical Society of America 124, no. 2 (2008): EL51—EL56. https://doi.org/10.5281/zenodo.13446460.

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(Uploaded by Plazi for the Bat Literature Project) Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9 – 11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is conclude

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Li, Baizhong, Qiudi Chen, Peixiong Zhang та ін. "β-Ga2O3 Used as a Saturable Sbsorber to Realize Passively Q-Switched Laser Output". Crystals 11, № 12 (2021): 1501. http://dx.doi.org/10.3390/cryst11121501.

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β-Ga2O3 crystals have attracted great attention in the fields of photonics and photoelectronics because of their ultrawide band gap and high thermal conductivity. Here, a pure β-Ga2O3 crystal was successfully grown by the optical floating zone (OFZ) method, and was used as a saturable absorber to realize a passively Q-switched all-solid-state 1 μm laser for the first time. By placing the as-grown β-Ga2O3 crystal into the resonator of the Nd:GYAP solid-state laser, Q-switched pulses at the center wavelength of 1080.4 nm are generated under a output coupling of 10%. The maximum output power is 1

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Tabatchikova, Kristina, Alexey Taichenachev, and Valeriy Yudin. "Suppression of the Field Shift of Ramsey Resonance on Forbidden Transitions of Atoms and Ions." Siberian Journal of Physics 7, no. 3 (2012): 6–14. http://dx.doi.org/10.54362/1818-7919-2012-7-3-6-14.

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We perform a theoretical analysis of the Ramsey scheme with pulses of different duration and with a phase step in the second pulse with account for the finite width of laser line. We define optimum features of pulses that correspond to maximum suppression of the field shift and maximum amplitude of resonance for both schemes. Ramsey scheme with a phase step in the second pulse provides effective suppression of the field shift and it is less sensitive to the Rabi frequency fluctuations in comparison with Ramsey scheme with pulses of different duration. First experiments on ytterbium single-ion

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Gaioni, S. J., H. Riquimaroux, and N. Suga. "Biosonar behavior of mustached bats swung on a pendulum prior to cortical ablation." Journal of Neurophysiology 64, no. 6 (1990): 1801–17. http://dx.doi.org/10.1152/jn.1990.64.6.1801.

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1. The biosonar signal (pulse) of the mustached bat, Pteronotus parnellii parnellii, has four harmonics (H1-4), each consisting of a long constant-frequency component (CF1-4) followed by a short frequency-modulated component (FM1-4). As the bat approaches a target, it systematically modifies its pulses to optimize the extraction of information from the echoes. These behavioral responses include 1) Doppler-shift (DS) compensation in which the bat adjusts the frequency of its pulses to correct for the DS in the echoes. This maintains the echo CF2 at a frequency to which the bat's cochlea is very

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Zhao, Chuanrui, Pingzhang Yu, Zhengping Wang, Yanqing Liu, Fapeng Yu, and Xinguang Xu. ">10 kW peak power self-frequency doubling laser." Laser Physics Letters 20, no. 4 (2023): 045001. http://dx.doi.org/10.1088/1612-202x/acbb7a.

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Abstract A passively Q-switched self-frequency doubling (SFD) green laser based on quasi-continuous diode-pumped and Nd:Ca3TaGa3Si2O14 crystal was developed for the first time with Cr4+:Y3Al5O12 as the saturation absorber. The output wavelength was 533 nm and the maximum average output power was 57 mW, corresponding to single pulse energy, pulse duration, and peak power of 190 μJ, 14.35 ns, and 13.24 kW, respectively. To our knowledge, this is the best result of diode-pumped, pulsed SFD lasers to date. Its compact components and low cost provide a better way to obtain an all-solid-state, minia

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Kolli, R. Prakash, and Frederick Meisenkothen. "The Influence of Experimental Parameters and Specimen Geometry on the Mass Spectra of Copper During Pulsed-Laser Atom-Probe Tomography." Microscopy and Microanalysis 20, no. 6 (2014): 1715–26. http://dx.doi.org/10.1017/s1431927614013488.

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AbstractWe have studied the influence of experimental factors and specimen geometry on the quality of the mass spectra in copper (Cu) during pulsed-laser atom-probe tomography. We have evaluated the effects of laser pulse energy, laser pulse frequency, specimen base temperature, specimen tip radius, and specimen tip shank half-angle on the effects of mass resolving power, (m/Δm), at full-width at half-maximum and at full-width at tenth-maximum, the tail size after the major mass-to-charge state (m/n) ratio peaks, and the mass spectra. Our results indicate that mass resolving power improves wit

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Sjare, B. L., and T. G. Smith. "The vocal repertoire of white whales, Delphinapterus leucas, summering in Cunningham Inlet, Northwest Territories." Canadian Journal of Zoology 64, no. 2 (1986): 407–15. http://dx.doi.org/10.1139/z86-063.

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The underwater vocalizations of white whales, Delphinapterus leucas, summering at Cunningham Inlet, Northwest Territories, were recorded from mid-July to mid-August 1981 to 1983. A total of 807 tonal calls (whistles) were classified into 16 contour types. The following acoustic parameters were measured for each whistle: minimum, maximum, and mean frequency of the fundamental, contour or shape of the fundamental, duration, and the slope of the frequency changes during the call. Some 436 pulsed calls were classified into three major categories: click series, pulsed tones, and noisy vocalizations

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Binder-Macleod, S. A., and W. J. Barrish. "Force response of rat soleus muscle to variable-frequency train stimulation." Journal of Neurophysiology 68, no. 4 (1992): 1068–78. http://dx.doi.org/10.1152/jn.1992.68.4.1068.

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1. The purpose of this study was to study the effects of a high-frequency burst of pulses at the onset of a subtetanic train of pulses on the force output of the rat soleus muscle. 2. The soleus muscle was studied in eight rats deeply anesthetized with urethan. The effects of two-, three-, or four-pulse bursts at the onset of subtetanic trains containing a total of 12 pulses were studied in detail. 3. The results showed that two-pulse bursts at the onset of the train produced approximately 20% augmentation in average force and nearly a 50% reduction in the time required to reach a targeted lev

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Lee, Jeong Ki, Dong Man Suh, and Seung Seok Lee. "Change of the Pulsed Eddy Current Signals by the Variation of the Thickness of an Aluminum Specimen." Key Engineering Materials 297-300 (November 2005): 2028–33. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2028.

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The conventional eddy current testing uses a sinusoidal signal with very narrow frequency bandwidth. Whereas, the pulsed eddy current method uses a pulse signal with a broad frequency bandwidth. This allows multi-frequency eddy current testing, and the penetration depth is greater than that of the conventional eddy current testing. In this work, the pulsed eddy current instrument was developed for evaluating the metal loss. The developed instrument was consist of the pulse generator generating the square pulse of maximum 40 V, the amplifier controlled to 52dB, the A/D converter of 16bit 20MHz,

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Wu, Jiaze, Youlun Ju, Jiawei Fan, et al. "High-Energy Injection-Seeded Single-Frequency Er:YAG Laser at 1645 nm Pumped by a 1532 nm Fiber Laser." Photonics 11, no. 8 (2024): 752. http://dx.doi.org/10.3390/photonics11080752.

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A single-frequency, Q-switched Er:YAG laser, pumped by a 1532 nm fiber laser, has been demonstrated. At the pulse repetition frequency (PRF) of 200 Hz, the maximum single-frequency laser of 5.5 mJ is attained, and, correspondingly, the pulse width is 212 ns. Using the heterodyne technique, the single-frequency laser spectrum’s full width at half maximum is determined to be 2.73 MHz. The experimental results show that the single-frequency laser has excellent beam quality factors (M2) of 1.18 and 1.21.

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Andriychuk, V. A., M. S. Nakonechny, Y. M. Osadtsa, and Y. O. Filiuk. "BEHAVIOR OF LED LIGHT SOURCES IN PULSE POWER." Tekhnichna Elektrodynamika 2021, no. 1 (2021): 68–72. http://dx.doi.org/10.15407/techned2021.01.068.

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The researches results of the energy and dynamic characteristics for FYL-3014 and ARPL-1W LEDs with different spectral radiation when voltage rectangular pulses feds to LEDs are presented in the paper. On the basis of obtained oscilograms it is established that electrical circuits of pulsed supply of the LEDs contain hidden reactive elements of inductive and capacitive nature. The substitution schemes are proposed for these circuits and their parameters have been determined. In substitution schemes that are proposed for these circuits the LED is represented by a parallel RC link, the active co

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35

Brekhov, Kirill, Vladislav Bilyk, Andrey Ovchinnikov, Oleg Chefonov, Vladimir Mukhortov, and Elena Mishina. "Resonant Excitation of the Ferroelectric Soft Mode by a Narrow-Band THz Pulse." Nanomaterials 13, no. 13 (2023): 1961. http://dx.doi.org/10.3390/nano13131961.

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This study investigates the impact of narrow-band terahertz pulses on the ferroelectric order parameter in Ba0.8Sr0.2TiO3 films on various substrates. THz radiation in the range of 1–2 THz with the pulse width of about 0.15 THz was separated from a broadband pulse with the interference technique. The 375 nm thick BST film on a MgO (001) substrate exhibits enhanced THz-induced second harmonic generation when excited by THz pulses with a central frequency of 1.6 THz, due to the resonant excitation of the soft phonon mode. Conversely, the BST film on a Si (001) substrate shows no enhancement, due

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36

Chaudhary, F. Yehya &. A. K. "Study of Coupling mechanism of optical and acoustic energy in the Time Resolved Pulsed Photoacoustic spectrum of I2 molecules at Different Temperature and Pressure." Albaydha University Journal 3, no. 2 (2021): 9–17. http://dx.doi.org/10.56807/buj.v3i2.138.

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The paper reports the time resolved pulsed photoacoustic study of I2 molecules using a single 532 nm, pulses of 7 ns duration at 10 Hz repetition rate obtained from Q- switched Nd:YAG laser. Frank -Condon principle based assignments confirms the presence of several numbers of ( ν”- ν’) vibrational transitions covered by a single 532 + 2nm pulse profile. The strongest vibronic transition lines correspond to (32-0) and (31-0) transitions have the maximum intensities andpart of equally separated bandwidth of the laser pulse. These strongest acoustic modes of I2 molecules are located at 4000 Hz an

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37

Ahmad, A., M. F. A. Rahman, M. A. M. Johari, et al. "Hafnium Bismuth Erbium Co-Doped Fiber Based Dark Pulses Generation With Black Phosphorus As Saturable Absorber." Journal of Physics: Conference Series 2075, no. 1 (2021): 012018. http://dx.doi.org/10.1088/1742-6596/2075/1/012018.

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Abstract A dark pulse generation is demonstrated in a fiber laser configured with a 20 cm long HBEDF and multilayer Black Phosphorus as a gain medium and saturable absorber, respectively. Dark pulses fiber laser at 1.5 µm region was obtained when the pump power exceeds the threshold of 147 mW. Meanwhile, the spectrum of the dark pulse is centred at 1556.40 nm, with the 3 dB bandwidth of 0.12 nm and the separation between adjacent pulses is 1145 ns, corresponding to the cavity length of 211 m. The pulse width was measured to be around 320 ns. The radio-frequency spectrum of the dark pulse, whic

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38

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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Wang, Qian, Junqi Shen, Shengsun Hu, Guancheng Zhao, and Jie Zhou. "Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding." Materials 13, no. 18 (2020): 4016. http://dx.doi.org/10.3390/ma13184016.

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High-quality joining of dissimilar alloys between Fe-36Ni alloy and 304L stainless steel is essential in the manufacturing of LNG tanker. In this study, lap joints of Fe-36Ni and 304L dissimilar alloys were fabricated by a pulsed gas tungsten arc welding (P-GTAW) process. The effects of low-frequency pulse on the appearance, microstructure and mechanical properties of the Fe-36Ni/304L lap joints was investigated. With the increase of frequency, the feature sizes of α (the transition angle of the upper surface of Fe-36Ni to the surface of the weld bead) and R (shortest distance between weld roo

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40

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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41

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.

Full text

Abstract:

(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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42

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.

Full text

Abstract:

(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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43

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.

Full text

Abstract:

(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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44

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.

Full text

Abstract:

(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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45

Malav, Harish, K. P. Maheshwari, and Y. Choyal. "Analytical and numerical investigation of the pulse-shape effect on the longitudinal electric field of a tightly focused ultrafast few-cycle TM01 laser beam." Laser and Particle Beams 30, no. 1 (2012): 75–86. http://dx.doi.org/10.1017/s026303461100070x.

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AbstractThe effect of temporal pulse-shape on the characterization of the longitudinal electric field resulting from the tight-focusing of an ultrashort few-cycle TM01 laser beam in free space is investigated analytically and numerically. The longitudinal field is found to be sensitive to the pulse-shape of the driving field. The temporal pulse-shapes considered are Gaussian, Lorentzian, and hyperbolic secant having identical full width at half maximum of intensity. Analytical calculations are made beyond the paraxial and slowly varying envelope approximations. From the numerical results we fi

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46

Kim, J., S. P. Kuo, and Paul Kossey. "Modelling and numerical simulation of microwave pulse propagation in an air-breakdown environment." Journal of Plasma Physics 53, no. 3 (1995): 253–66. http://dx.doi.org/10.1017/s0022377800018183.

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The dependences of the propagation characteristics of an intense microwave pulse on the intensity, frequency, width and shape of the pulse in an air- breakdown environment are examined. Numerical simulations lead to a useful empirical relation P3W = α = const, where P and W are the incident power and width of the pulse and α depends on the percentage of the pulse energy transferred from the source point to a given position. The results also show that, using a single unfocused microwave pulse transmitted upwards from the ground, the maximum electron density produced at, for example, 50 km altit

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Artser, I. R., M. V. Melnik, A. N. Tsypkin, and S. A. Kozlov. "The spectrum broadening of a single-cycle terahertz pulse caused by phase self-modulation in a nonlinear medium and the spectrum of radiation generated in its field at tripled frequencies." Computer Optics 48, no. 1 (2024): 61–67. http://dx.doi.org/10.18287/2412-6179-co-1299.

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When the number of oscillations in an optical pulse decreases, the emission spectrum generated at triple frequencies and the spectrum of the fundamental pulse, broadened due to phase self-modulation during propagation in a medium with cubic nonlinearity, begin to overlap. This work demonstrates that the overlap magnitude of the spectrum broadening for a single-period terahertz pulse, caused by the emission of triple frequencies and phase self-modulation of the fundamental pulse, is |s| = 0.85. The complex spectra are phase-shifted by p, which mutually weakens these nonlinear effects. For a sin

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48

Andriichuk, V. A., M. S. Nakonechnyi, and Ya O. Filiuk. "Kinetics of narrow-spectrum LED glow under pulsed power." Semiconductor Physics, Quantum Electronics and Optoelectronics 26, no. 2 (2023): 230–35. http://dx.doi.org/10.15407/spqeo26.02.230.

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The results of experimental investigations of the glow kinetics of narrow-spectrum LEDs based on InGaN-GaN 450 and 520 nm and AlGaInP-GaAs 625 nm structures are presented. The increase and decrease of the light flux intensity under pulsed power are described by exponential dependences containing fast and slow components. The time constants of both components decrease with the increase of the pulse frequency for all three types of LED samples. The time constant of the slow component decreases with the increase of the current and voltage pulse amplitudes. The maximum light output on the frequenc

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49

Guo, Jianjun, Fang Wang, Shijie Zhang, Yifan Zhou, and Lin Zhu. "Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy." Materials 17, no. 2 (2024): 468. http://dx.doi.org/10.3390/ma17020468.

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The effects of different pulse frequencies on the microstructure grain size and solid solubility of Al-9Si alloy were systematically investigated using OM, SEM, and EDS. The impact on the mechanical properties of the alloy was analyzed using a micro-Vickers hardness tester and multifunctional friction tester. During solidification, the Al-9Si alloy is exposed to high-frequency electric current pulses with a current density of 300 A/cm2 and frequencies of 0 Hz, 500 Hz, 1000 Hz, and 2000 Hz. The experimental results show that the Lorentz force also increases as the high-frequency pulse frequency

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50

Sumi, Yasuaki, Shigeki Obote, Yutaka Fukui, Kazutoshi Tsuda, and Kouichi Syoubu. "A New Fractional-N PLL Frequency Synthesizer." Journal of Circuits, Systems and Computers 07, no. 05 (1997): 395–405. http://dx.doi.org/10.1142/s0218126697000292.

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Recently, the speedup of lock up time is required in the Phase Locked Loop (PLL) frequency synthesizer. The fractional-N method is one of the most important techniques among the speedup methods proposed hitherto. The fractional-N programmable divider can divide not only an integer step but also a fractional one. However, the phase detector always generates the phase error pulse in every period of reference frequency and the elimination of this phase error pulse seems to be difficult. In this paper, a new fractional-N programmable divider is proposed. In this divider, the width of phase error p

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