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Journal articles on the topic 'Pulse Pulse'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

MUQAFFI, FAATIH RIFQI, BAMBANG MUKTI WIBAWA, and DARMAWAN HIDAYAT. "Pembangkitan Pulsa Orde Nanodetik Berbasis Mikrokontroler Untuk Eksitasi Transduser Ultrasonik." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 8, no. 1 (2020): 229. http://dx.doi.org/10.26760/elkomika.v8i1.229.

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ABSTRAK  Makalah ini melaporkan suatu teknik pembangkitan pulsa lebar orde nanodetik (ns) repetitif yang terprogram berbasis mikrokontroler untuk keperluan eksitasi transduser ultrasonik. Pembangkitan pulsa dan pengaturan jarak antar pulsa dilakukan melalui operasi timer mikrokontroler. Sebuah monostable multivibrator mengubah lebar pulsa dari mikrokontroler dalam orde nanodetik melalui pengaturan komponen pewaktuan resistor-kapasitor (RC) dengan cara pengaturan nilai R yang dibuat dari sebuah potensiometer digital. Hasil pengujian menunjukkan bahwa mikrokontroler membangkitkan pul

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2

Wei, Xianqi, Xiaoli Wang, Xin Li, and Weihua Liu. "Electronic Pulses from Pulsed Field Emission of CNT Cathodes." Journal of Nanomaterials 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/4396430.

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We presented a demonstration of infrared laser irradiated field emission electronic pulse based on carbon nanotube (CNT) cathodes. Electronic pulses greatly depended on pulsed infrared laser and were almost synchronous with laser pulses. We have designed a pulsed field emission cathode based on CNTs and investigated correlation between electronic pulse and laser pulse, acquiring the shortest width of electronic pulses about 50 ms and turn-on field less than 0.14 V/μm. Besides, we have studied the thermal effect on the pulsed field emission of CNT cathodes caused by laser heating. Interestingly

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3

Balcerak, Michał, Marcin Hołub, and Ryszard Pałka. "High voltage pulse generation using magnetic pulse compression." Archives of Electrical Engineering 62, no. 3 (2013): 463–72. http://dx.doi.org/10.2478/aee-2013-0037.

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Abstract The paper presents an overview of a method of nanosecond-scale high voltage pulse generation using magnetic compression circuits. High voltage (up to 18 kV) short pulses (up to 1.4 μs) were used for Pulsed Corona Discharge generation. In addition, the control signal of parallel connection of IGBT and MOSFET power transistor influence on system losses is discussed. For a given system topology, an influence of core losses on overall pulse generator efficiency is analysed.

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4

Jäggi, Beat, Daniel J. Förster, Rudolf Weber, and Beat Neuenschwander. "Residual heat during laser ablation of metals with bursts of ultra-short pulses." Advanced Optical Technologies 7, no. 3 (2018): 175–82. http://dx.doi.org/10.1515/aot-2018-0003.

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Abstract The usage of pulse bursts allows increasing the throughput, which still represents a key factor for machining with ultra-short pulsed lasers. The influence of the number of pulses within a burst on the specific removal rate is investigated for copper and stainless steel. Furthermore, calorimetric measurements were performed to estimate the residual energy coefficient as well as the absorptance of machined surfaces for copper to explain the reduced specific removal rate for a 2-pulse burst and the similar or even higher rate for a 3-pulse burst compared to single pulse ablation. Based

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5

Flood, C. J., G. Giuliani, and H. M. van Driel. "Pulsed electro-optic modulation for efficient, active continuous-wave laser mode-locking." Canadian Journal of Physics 71, no. 1-2 (1993): 1–4. http://dx.doi.org/10.1139/p93-001.

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We demonstrated efficient active mode-locking of a Nd:YAG laser using broad bandwidth, pulsed electro-optic modulation. A 10 GHz, LiTaO3 traveling wave phase modulator, driven by 300 ps FWHM electrical pulses with less than 1 mW of drive power, was used to generate detector-limited, mode-locked laser pulses of less than 50 ps duration at 76 MHz. Shorter modulator drive pulses are possible and near bandwidth-limited mode-locked pulses should be attainable. The use of pulsed modulation rather than conventional sinusoidal modulation permits both pulse width and pulse build-up time reductions and

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6

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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7

Mingolo, N., and J. J. Rocca. "Production of amorphous metallic surfaces by means of a pulsed glow discharge electron beam." Journal of Materials Research 7, no. 5 (1992): 1096–99. http://dx.doi.org/10.1557/jmr.1992.1096.

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A pulsed glow discharge electron beam has been used for the production of metallic amorphous surfaces in MgZn alloys. Electron beam pulses of 20 μs pulse width produced by a 40 A, 22.5 kV glow discharge were found to provide sufficient energy for melting the metallic surfaces; that due to the rapid cooling to the substrate yielded amorphous phases. The system allows control of the energy density, penetration, and pulse width of the heating pulse.

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8

Ho, Viet Luan, Robert M. Dorrell, Gareth M. Keevil, et al. "Dynamics and deposition of sediment-bearing multi-pulsed flows and geological implication." Journal of Sedimentary Research 89, no. 11 (2019): 1127–39. http://dx.doi.org/10.2110/jsr.2019.62.

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ABSTRACT Previous studies on dilute, multi-pulsed, subaqueous saline flows have demonstrated that pulses will inevitably advect forwards to merge with the flow front. On the assumption that pulse merging occurs in natural-scale turbidity currents, it was suggested that multi-pulsed turbidites that display vertical cycles of coarsening and fining would transition laterally to single-pulsed, normally graded turbidites beyond the point of pulse merging. In this study, experiments of dilute, single- and multi-pulsed sediment-bearing flows (turbidity currents) are conducted to test the linkages bet

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9

He, Chun Qing, Jun Cheng Wang, Jun Zhu, and Shao Jie Wang. "Design and Simulation of a Trap-Based Pulsed Slow Positron Beam." Materials Science Forum 733 (November 2012): 314–17. http://dx.doi.org/10.4028/www.scientific.net/msf.733.314.

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A simple pulsed slow positron beam based on a Penning-trap has been designed and is being constructed in Wuhan University. The cooled positrons from the trap with very low energy dispersion are dumped and chopped to pulses of a few tens of ns in width. Positron pulses are bunched by adjusting the potential of drift tube using an arbitrary wave generator, then accelerated to the target. Influences of the pulse width, the energy dispersion of positrons etc. on the time resolution of bunched positron pulse are simulated. The result shows that lower energy dispersion of positrons leads to much nar

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10

Shemyakin, A. N., M. Yu Rachkov, N. G. Solov’ev та M. Yu Yakimov. "Radiation Power Control of the Industrial CO₂ Laser Excited by а Nonself-Sustained Glow Discharge by Changing the Frequency of Ionization Pulses". Mekhatronika, Avtomatizatsiya, Upravlenie 21, № 4 (2020): 224–31. http://dx.doi.org/10.17587/mau.21.224-231.

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The article describes radiation power control of industrial CO2 lasers of Lantan series excited by а nonself-sustained glow discharge in the automatic mode. These lasers are closed-cycle fast gas-transport lasers excited by a nonself-sustained glow discharge with ionization by periodic-pulsed capacitively coupled auxiliary discharge. In this case, ionization and conductivity are provided by periodic-pulsed capacitively coupled discharge. The energy contribution to molecular oscillations is provided by the passage of the main discharge current through the plasma with electron density given by i

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11

Kholodnaya, G. E., R. V. Sazonov, D. V. Ponomarev, G. E. Remnev, and A. A. Vikanov. "Influence of current – conducting inserts in a drift tube on transportation of a pulsed electron beam at gigawatt power." Laser and Particle Beams 33, no. 4 (2015): 749–54. http://dx.doi.org/10.1017/s0263034615000762.

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AbstractThis paper describes the results of experimental research on the influence of the current-conducting inserts in a drift tube on transportation of a pulsed electron beam at gigawatt power and nanosecond duration. The experimental investigation was conducted using a TEU–500 laboratory-pulsed electron accelerator (parameters of the accelerator: Up to 550 keV; output electron current: 11.5 kA; pulse duration (at half-height): 60 ns; pulse frequency: 5 pulses/s; pulse energy: Up to 280 J). Air was chosen as the propagation medium. The pressure in the drift tube is 50 Torr. It is revealed th

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12

Grishin, A. V., S. L. Glushkov, B. P. Mironychev, et al. "Design of a synchronization system for the “Gamma-4” electrophysical facility." International Journal of Modern Physics: Conference Series 32 (January 2014): 1460333. http://dx.doi.org/10.1142/s2010194514603330.

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At RFNC-VNIIEF on the basis of a “Gamma-1” high-current pulsed accelerator there is being developed a four-module “Gamma-4” electrophysical facility. A synchronization system of the "Gamma-4" facility is meant for a simultaneous (with precision not worse than ±3 ns) triggering of high-volt gas-filled trigatron type switches of modules' pulse forming systems (144 items, operating voltage ≤ 1 MV), modules' pre-pulse switches (24 items, ≤ 3 MV) and 8 Marx generators (40 items, ≤ 100 kV). The synchronization system comprises 54 pulse generators, involving 25 generators on the basis of water insula

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13

Rao, Xin, Xiaodong Chen, Jun Zhou, Bo Zhang, and Yasir Alfadhl. "Design of a High Voltage Pulse Generator with Large Width Adjusting Range for Tumor Treatment." Electronics 9, no. 6 (2020): 1053. http://dx.doi.org/10.3390/electronics9061053.

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The unique biological effects stimulated by short pulsed electric field have many applications in tumor treatment, such as irreversible electroporation, electrochemotherapy, gene transfection and immune therapy. These biological effects require high voltage pulses with different pulse width in the range from nanoseconds to hundreds of microseconds. To fulfill this requirement, a compact high voltage pulse generator has been designed based on a switchable capacitor array and a SiC MOSFET switching array. The proposed pulse generator has one output channel with an adjustable pulse width from 100

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14

Hu, Ye Lin, Zhi Wen Du, and Zhao Quan Chen. "Development of a Pulsed DC Power Supply for Generating Cold Plasma Jet." Advanced Materials Research 791-793 (September 2013): 1841–44. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1841.

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This paper discusses a lithium battery-driven cold plasma jet at atmospheric pressure with a pulsed power supply of design and its simulation. H.V. DC(High voltage directed current) and pulsed discharge circuit comprise of the entire pulse power system. H.V. DC circuit using TIs TMS320F28335 chips as the core of the circuit control module, the chip improves the stability of the H.V.DC circuits. Pulsed discharge circuit design plays a crucial impact on the formation of the narrowed pulses. A new double pulsed discharge circuit is designed by the proposed program. As discharge experiment shown f

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15

Sang, Pil, Junseok Heo, Hui Park, and Hyoung Baac. "Photoacoustic Energy Sensor for Nanosecond Optical Pulse Measurement." Sensors 18, no. 11 (2018): 3879. http://dx.doi.org/10.3390/s18113879.

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We demonstrate a photoacoustic sensor capable of measuring high-energy nanosecond optical pulses in terms of temporal width and energy fluence per pulse. This was achieved by using a hybrid combination of a carbon nanotube-polydimethylsiloxane (CNT-PDMS)-based photoacoustic transmitter (i.e., light-to-sound converter) and a piezoelectric receiver (i.e., sound detector). In this photoacoustic energy sensor (PES), input pulsed optical energy is heavily absorbed by the CNT-PDMS composite film and then efficiently converted into an ultrasonic output. The output ultrasonic pulse is then measured an

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16

Martinez, Oscar Eduardo. "Pulse distortions in tilted pulse schemes for ultrashort pulses." Optics Communications 59, no. 3 (1986): 229–32. http://dx.doi.org/10.1016/0030-4018(86)90290-7.

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17

Godun, D. V., S. V. Bordusau, and G. P. Budzko. "Output Current Control System of a High Voltage Electric Pulse Generator for Plasma Excitation." PLASMA PHYSICS AND TECHNOLOGY 6, no. 1 (2019): 7–9. http://dx.doi.org/10.14311/ppt.2019.1.7.

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A control and pulse discharge current limiting system integrated into an AC/DC converter and pulse modulator of a high voltage pulse generator have been developed. The peculiarity of such system\textquotesingle s operation is the stabilization of the power supplied to the discharge and the correction of the width of output electric pulses towards decrease upon reaching the specified pulsed current amplitude value. The system enables the pulse generator to work in the modes close to the ``short circuited load'' mode. In this case the driving module of a composite IGBT key performs the correctio

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18

Stankevic, Voitech, Povilas Simonis, Nerija Zurauskiene, et al. "Compact Square-Wave Pulse Electroporator with Controlled Electroporation Efficiency and Cell Viability." Symmetry 12, no. 3 (2020): 412. http://dx.doi.org/10.3390/sym12030412.

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The design and development of a compact square-wave pulse generator for the electroporation of biological cells is presented. This electroporator can generate square-wave pulses with durations from 3 μs up to 10 ms, voltage amplitudes up to 3500 V, and currents up to 250 A. The quantity of the accumulated energy is optimized by means of a variable capacitor bank. The pulse forming unit design uses a crowbar circuit, which gives better control of the pulse form and its duration, independent of the load impedance. In such cases, the square-wave pulse form ensures better control of electroporatio

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19

Huang, Kuang-Liang, and Wen-Shaw Chen. "BA and Sucrose Increase Vase Life of Cut Eustoma Flowers." HortScience 37, no. 3 (2002): 547–49. http://dx.doi.org/10.21273/hortsci.37.3.547.

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An experiment was conducted to measure the effects of pulse treatments of BA, sucrose, and BA before, after, or with sucrose, on the vase life of cut Eustoma flowers. A BA pulse at 50 mg·L-1 before 4% sucrose promoted the longevity of cut Eustoma flowers better than other treatments. Simultaneously, sucrose, glucose, and mannose concentrations in flowers during vase periods were maintained at higher levels in double pulse treatments than in the single pulses. Ethylene production in flowers 2 days after vase treatment was highest in the BA-treated flowers; intermediate in flowers pulsed with BA

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20

Svilainis, Linas, Vytautas Dumbrava, and Andrius Chaziachmetovas. "Investigation of the Half Bridge and Transformer Push–Pull Pulser Topologies for Ultrasonic Transducer Excitation." Journal of Circuits, Systems and Computers 24, no. 05 (2015): 1550062. http://dx.doi.org/10.1142/s0218126615500620.

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Comparison of two high power pulser topologies is presented. Pulser design was aimed for piezoelectric transducer excitation, yet it can also be used for electromagnetic acoustic transducer (EMAT) or capacitive micromachined ultrasonic transducers (CMUTs) excitation. Pulser can produce both single rectangular pulse and trains of rectangular arbitrary duration pulses. In order to achieve the economy of the electrical power consumption and speed both high-pulling and low-pulling elements are active switches. Energy per pulse was used to evaluate the amount of energy consumed. Two topologies were

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21

Pratomo, Hariyo P. S., and Klaus Bremhorst. "Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction." Applied Mechanics and Materials 534 (February 2014): 117–23. http://dx.doi.org/10.4028/www.scientific.net/amm.534.117.

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In this paper, statistical quantities of a fully pulsed round jet along the jet centerline are reported. A range of the Reynolds (1.5 x 104 < Re < 4 x 104) and Strouhal (0.0064 < St < 0.0076) numbers is used to generate the jet. Physically this unsteady jet produces a series of distinct pulses due to the excitations. The mechanically excitations lead to the appearance of pulse dominated and high turbulence steady jet region in which their existence is of a strong dependence on the level of the controlled parameters. After the pulse merging completes the pulsed jet alters to a self-

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22

Zhao, Lu, Antoine Normand, Jonathan Houard, et al. "Optimizing Atom Probe Analysis with Synchronous Laser Pulsing and Voltage Pulsing." Microscopy and Microanalysis 23, no. 2 (2017): 221–26. http://dx.doi.org/10.1017/s1431927616012666.

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AbstractAtom probe has been developed for investigating materials at the atomic scale and in three dimensions by using either high-voltage (HV) pulses or laser pulses to trigger the field evaporation of surface atoms. In this paper, we propose an atom probe setup with pulsed evaporation achieved by simultaneous application of both methods. This provides a simple way to improve mass resolution without degrading the intrinsic spatial resolution of the instrument. The basic principle of this setup is the combination of both modes, but with a precise control of the delay (at a femtosecond timescal

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23

Mickaliger, Mitchell B., Ben W. Stappers, Cees G. Bassa, and Aldus G. Fletcher. "1,000,000 Giant Pulses from the Crab Pulsar." Proceedings of the International Astronomical Union 13, S337 (2017): 380–81. http://dx.doi.org/10.1017/s174392131700922x.

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AbstractThe Crab pulsar was first detected soon after the discovery of pulsars, and has long been studied for its unique traits. One of these traits, giant pulses that can be upwards of 1000 times brighter than the average pulse, was key to the Crab’s initial detection. Giant pulses are only seen in a few pulsars, and their energy distributions distinguish them from normal pulsed emission. There have been many studies over a period of decades to measure the power-law slope of these energy distributions, which provide insight into the possible emission mechanism of these giant pulses.The 42-foo

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KUMAR, GYANENDRA, Sandeep Shelar, Ankur Patel, et al. "Investigation of Effect of Nanosecond Pulsed Electric Field on MCF-7 Breast Cancer Cells." Journal of Drug Delivery and Therapeutics 11, no. 3 (2021): 43–49. http://dx.doi.org/10.22270/jddt.v11i3.4827.

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Pulsed electric field therapy is a novel non-invasive approach for cancer therapy. It serves as a cell permeability enhancing agent for cancer treatment. Nanosecond, high-electrical field pulse power technology is used for delivering variable, controllable, intracellular electrical perturbations in several biological systems. Here, we investigated the effect of nanosecond (ns) electric pulse (nsEP) as a therapeutic tool for cancer. In in-vitro study, the breast cancer cells (MCF-7) were exposed with electric field of ~18kV/cm intensity, ~25ns duration, at 1.5Hz in a 2mm electroporation cuvette

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25

Wu, Jian Xing, Pei Jarn Chen, Yi Chun Du, Chien Lin Wang, Guan Chun Chen, and Tain Song Chen. "Development of a Bipolar Pulse Generator for High-Frequency Ultrasound Imaging System." Applied Mechanics and Materials 311 (February 2013): 217–21. http://dx.doi.org/10.4028/www.scientific.net/amm.311.217.

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The pulse generator is the critical component in high-frequency ultrasound imaging systems. Currently, there still exist some shortcomings about commercial ultrasound image systems and devices such as 5900 PR …etc.. However, to achieve a higher sensitivity and high performance, a programmable pulser generator is desired to match the requirements of high frequency ultrasound image system. In this study, we utilized a novel bipolar pulse generator method to overcome those issues in developed high resolution image system. As the needs of application in clinic, a real –time of high-frequency ultra

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26

Pinjari, N., and S. Bindu. "Compact Solid-State Marx Generator for Repetitive Applications." Engineering, Technology & Applied Science Research 10, no. 5 (2020): 6224–30. http://dx.doi.org/10.48084/etasr.3747.

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The Marx generator plays a vital role in a pulsed power system. In this paper, a modified compact bipolar output pulse solid-state Marx generator topology is developed. A three-stage prototype is designed and tested, in which pulse width, polarity, and peak voltage of the output pulse are made variable. It is possible to generate either positive or negative pulses with less rise time. Various components which affect the repetitive frequency of the developed Marx generator are evaluated. Analysis reveals that the total time period TO is a function of capacitor charging time. This is been valida

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27

Laskovnev, A. P., M. I. Markevich, A. N. Malyshko, V. I. Zhuravleva, and A. M. Chaplanov. "Formation of colloidal solutions of silicon nanoparticles in ethyl alcohol with ultra-short laser pulses." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, no. 1 (2021): 7–11. http://dx.doi.org/10.29235/1561-8358-2021-66-1-7-11.

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The study of surface morphology of a silicon target after laser exposure, the formation and study of nanoparticles, obtained by laser ablation by ultrashort infrared pulses, were conducted. The material was processed using a yttrium aluminum garnet laser (LS-2134D) with a wavelength of 1064 nm, generating in a two-pulse mode (pulses are separated by a time interval of 3 μs, pulse duration is 10 ns, pulse repetition rate is 10 Hz, single pulse energy ~ 0.05 J). Alcohol solutions of silicon nanoparticles were obtained by laser ablation. It is shown that an ensemble of particles of different size

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Basu, A. K., B. C. Joshi, and D. Bhattacharya. "Simultaneous Radio and X-Ray observations of Crab Pulsar." Proceedings of the International Astronomical Union 13, S337 (2017): 309–10. http://dx.doi.org/10.1017/s1743921317008419.

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AbstractCrab Pulsar (PSR B0531+21) is known to emit pulsed emission in all bands of the electromagnetic spectrum. It also emits giant radio pulses (GRPs) frequently, which are roughly a hundred to million times brighter than the normal pulses. We aim to study whether there is a significant X-ray enhancement correlated with the occurrence of GRPs, using simultaneous observations with the ASTROSAT, the Giant Meterwave Radio telescope (1300 MHz) and the Ooty Radio telescope (325 MHz). This required determination of fixed pipeline offsets between different instruments. We find the offset between A

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Canal, M. M., and H. D. Piggins. "Resetting of the hamster circadian system by dark pulses." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 290, no. 3 (2006): R785—R792. http://dx.doi.org/10.1152/ajpregu.00548.2005.

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Circadian rhythms of animals are reset by exposure to light as well as dark; however, although the parameters of photic entrainment are well characterized, the phase-shifting actions of dark pulses are poorly understood. Here, we determined the tonic and phasic effects of short (0.25 h), moderate (3 h), and long (6–9 h) duration dark pulses on the wheel-running rhythms of hamsters in constant light. Moderate- and long-duration dark pulses phase dependently reset behavioral rhythms, and the magnitude of these phase shifts increased as a function of the duration of the dark pulse. In contrast, t

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Valizade, Arash, Pejman Rezaei, and Ali Asghar Orouji. "A compact reconfigurable sub-nanosecond pulse generator with pulse-shape modulation." International Journal of Microwave and Wireless Technologies 9, no. 4 (2016): 741–45. http://dx.doi.org/10.1017/s1759078716000921.

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A new design of reconfigurable sub-nanosecond pulse generator (PG) with pulse shape selection ability is presented in this paper. Step recovery diode is used as the pulse sharpening device and the pulse shaping circuit consists of a controllable RC differentiator in which a single PIN diode is embedded, which provides two different switchable pulse shaping performances. The realized PG has a compact (10 × 12 mm2) simple structure and is easy to implement while generating Gaussian and monocycle pulses with 510 and 660 ps pulse width, respectively. The proposed pulse shaping method is versatile

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Wu, Yali, and Dongguang Zhang. "Effect of Pulsed Electric Field on Freeze-Drying of Potato Tissue." International Journal of Food Engineering 10, no. 4 (2014): 857–62. http://dx.doi.org/10.1515/ijfe-2014-0149.

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Abstract The influence of pulsed electric field (PEF) on the drying behavior of potato was investigated, and the optimal parameters were determined. Drying experiments were conducted with different PEF pre-treatments. The effects of process parameters of PEF pre-treatment were examined with respect to drying rate, drying time, productivity per unit area, and energy consumption. Results showed that the three parameters investigated were significant in the following sequence: pulse number, electric field strength, and pulse width. The optimal electric field strength, pulse width, and pulse numbe

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Duan, Li Wei, and Yan Ji Hong. "Plasma Assisted Flame Holding of a Propane Jet." Applied Mechanics and Materials 138-139 (November 2011): 848–51. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.848.

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A nanosecond pulsed plasma discharge is used to ignite a propane-jet flame. The nonequilibrium plasma is produced by repetitive pulses of 30 kV peak voltage, 70 ns pulse width and 2 kHz repetition rate. The experimental results shows that the use of a repetitively nanosecond pulsed discharge resulted in significant increase in flame stability.

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King, Emma, Deirdre Cobbin, and Damien Ryan. "The Reliable Measurement of Radial Pulse: Gender Differences in Pulse Profiles." Acupuncture in Medicine 20, no. 4 (2002): 160–67. http://dx.doi.org/10.1136/aim.20.4.160.

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This study was undertaken to determine whether healthy adults exhibited characteristic pulse profiles. Pulse characteristics measured for 83 women and 65 men included presence at the Traditional Chinese Medicine (TCM) locations ( Cun, Guan, Chi); and depth (superficial, middle, deep), overall pulse force, relative pulse force, pulse width and pulse rhythm. Most subjects had similar values for many of the characteristics investigated including relative pulse force at the three traditional palpation locations ( Cun, Guan and Chi), pulse width and pulse rhythm. There were some significant gender

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Jaber, Ghufran S., Khawla S. Khashan, and Maha J. Abbas. "Preparation ZnO nanoparticles with Different Concentration by Laser Ablation in Liquid." Engineering and Technology Journal 39, no. 1B (2021): 197–202. http://dx.doi.org/10.30684/etj.v39i3a.1880.

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The effects of varying laser pulse numbers on the fabricated of ZnONPs by pulsed laser ablation in deionized water of Zn-metal are investigated. The Nd: YAG laser at energy 600mJ prepared three samples by change the laser pulse number (100, 150, and 200). The results were collected and examined using an electron scanning microscope, XRD – diffraction, and transmission electron microscope. The result revealed the colloidal spherical shape and the homogeneous composition of the ZnO NPs. The nanoparticles resulted in different concentrations and sized distributions by changing the pulse number of

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BONETTA, SILVIA, SARA BONETTA, MONICA BELLERO, MARCO PIZZICHEMI, and ELISABETTA CARRARO. "Inactivation of Escherichia coli and Staphylococcus aureus by Pulsed Electric Fields Increases with Higher Bacterial Population and with Agitation of Liquid Medium." Journal of Food Protection 77, no. 7 (2014): 1219–23. http://dx.doi.org/10.4315/0362-028x.jfp-13-487.

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Inactivation of Escherichia coli, E. coli O157:H7, and Staphylococcus aureus in liquid media by pulsed electric fields (PEF) was conducted at varying bacterial populations with and without sample agitation. A laboratory-scale PEF batch unit with a rectangular electric pulse was used, operating under the following conditions: 25 kV/cm (E. coli, E. coli O157:H7) and 30 kV/cm (S. aureus) electric field strengths, 1-μs pulse width, 1-Hz pulse repetition rate, and 20 to 350 pulses for all samples. Not surprisingly, bacterial inactivation (for all three strains) increased with increasing pulse numbe

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Афанасьєва, Ольга Валентинівна, Наталія Олексіївна Лалазарова та Олена Георгіївна Попова. "Нові технології лазерної поверхневої обробки". Aerospace technic and technology, № 2 (28 квітня 2021): 59–65. http://dx.doi.org/10.32620/aktt.2021.2.07.

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Subject and purpose. Currently, gas, solid-state, and fiber lasers are used to process materials in the aviation industry. For the thermal treatment of steels, gas CO2 lasers with a capacity of more than 1 kW used, which are reliable in operation but have high cost and low efficiency. There are no results on the use of low-power (up to 20 W) pulsed-mode lasers for surface hardening of steel products. The purpose of this work is to determine the modes of surface hardening of products from carbon and alloy steels using low-power solid-state pulsed YAG lasers. Methodology. For laser hardening, a

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Lauterio-Cruz, Jesús Pablo, Juan Carlos Hernandez-Garcia, José David Filoteo-Razo, et al. "A Novel Low-Cost Synchronous/Asynchronous Microcontroller-Based Pulsed Laser." Electronics 8, no. 5 (2019): 489. http://dx.doi.org/10.3390/electronics8050489.

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The development and implementation of continuous-wave (CW) or pulsed lasers has become essential in all areas of science and engineering. In the case of pulsed lasers, their emission period is commonly set up by the length of the laser cavity, which implies that it is necessary to replace the whole laser or modify the cavity to change the repetition rate. On the other hand, microcontrollers, capable of performing specific tasks saving size, cost and power consumption, have proven to be a powerful tool for various applications. To the best of our knowledge, we present a novel pulsed laser based

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Li, Tie Jun, Jing Tang, Li Jun Yan, and Yang Wang. "Surface Quality of Pulsed Laser Cutting of Difficult to Machine Steel." Advanced Materials Research 299-300 (July 2011): 1016–19. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.1016.

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This paper presented the experiments of Nd:YAG pulsed laser cutting of titanium alloy, super-alloy and stainless steel sheet, and investigated the influences of different laser cutting parameters on the surface quality factors focusing surface morphology. In comparison with air-, argon- and nitrogen-assisted laser cutting, argon-assisted laser cutting comes with unaffected surface quality and is suitable for laser cutting with subsequent welding requirement. With analyzing the interaction between pulses overlapping rate and energy, the results show that medium pulse overlapping rate and lower

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GRIGORYAN, ARMINE, GAREGIN YESAYAN, ARAM ZEYTUNYAN, and LEVON MOURADIAN. "OPTIMIZATION OF FEMTOSECOND PULSE COMPRESSION BY PULSE ASYMMETRY MANAGEMENT." International Journal of Modern Physics: Conference Series 15 (January 2012): 179–83. http://dx.doi.org/10.1142/s201019451200712x.

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We present results of numerical studies of the phase compensation in the pulse compression process via the shaping of asymmetric pulses at the system input. In this case, an effective pulse compression is achieved, with a ratio corresponding to the pulse spectral broadening in fiber. This opportunity is caused by the fact that self-phase modulation in fiber results in a phase given by the pulse shape.

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Pakhomov, M. A., and V. I. Terekhov. "RANS Simulation of the Effect of Pulse Form on Fluid Flow and Convective Heat Transfer in an Intermittent Round Jet Impingement." Energies 13, no. 15 (2020): 4025. http://dx.doi.org/10.3390/en13154025.

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The of effect pulse form (rectangular, sinusoidal and triangular) on the fluid flow and heat transfer of an intermittent jet impingement was studied numerically. It was shown in a non-steady-state jet, both an increase and decrease in heat transfer are possible compared with steady-state jet for all investigated pulse forms. For small distances between the pipe edge and obstacle (H/D ≤ 6) in the pulsed jet, heat transfer around the stagnation point increases with increasing pulse frequency, while for H/D > 8 an increase in frequency causes a heat transfer decrease. A growth in the Reynolds

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Sedky, Sherif, Jeremy Schroeder, Timothy Sands, Tsu-Jae King, and Roger T. Howe. "Effect of excimer laser annealing on the structural properties of silicon germanium films." Journal of Materials Research 19, no. 12 (2004): 3503–11. http://dx.doi.org/10.1557/jmr.2004.0450.

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We investigated the use of a pulsed excimer laser having a wavelength of 248 nm, a pulse duration of 38 ns, and an average fluence between 120 and 780 mJ/cm2 to locally tailor the physical properties of Si1−xGex (18% < x < 90%) films deposited by low-pressure chemical vapor deposition at temperatures between 400 and 450 °C. Amorphous as-deposited films showed, after laser annealing, strong {111} texture, a columnar grain microstructure, and an average resistivity of 0.7 mΩ cm. Atomic force microscopy indicated that the first few laser pulses resulted in a noticeable reduction in surface

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Maji, Kuntal. "Parametric Study and Optimization of Pulsed Laser Thermal Micro-Forming of Thin Sheets." International Journal of Manufacturing, Materials, and Mechanical Engineering 9, no. 2 (2019): 47–61. http://dx.doi.org/10.4018/ijmmme.2019040103.

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This article presents the investigations on deformation behavior in precision forming of thin sheet metal by laser pulses using finite element analysis. The temperature and deformation fields were estimated and analyzed in pulsed laser micro-forming of AISI 304 stainless steel sheet of rectangular and circular shape considering the effects of different process parameters such as laser power, spot diameter and pulse on time. Response surface models based on finite element simulation results were developed to study the effects of the process parameters on deformations for the rectangular and cir

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YATSUI, KIYOSHI, KOUICHI SHIMIYA, KATSUMI MASUGATA, MASAO SHIGETA, and KAZUHIKO SHIBATA. "Characteristics of pulsed power generator by versatile inductive voltage adder." Laser and Particle Beams 23, no. 4 (2005): 573–81. http://dx.doi.org/10.1017/s0263034605050779.

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A pulsed power generator by inductive voltage adder, versatile inductive voltage adder (VIVA-I), which features a high average potential gradient (2.5 MV/m), was designed and is currently in operation,. It was designed to produce an output pulse of 4 MV/60 ns by adding 2 MV pulses in two-stages of induction cells, where amorphous cores are installed. As a pulse forming line, we used a Blumlein line with the switching reversed, where cores are automatically biased due to the presence of prepulse. Good reproducibility was obtained even in the absence of the reset pulse. Within ∼40% of full charg

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Sun, Yue, Kui Li, Bo Gao, et al. "Study on microstructure and wear resistance of Zr-17Nb alloy irradiated by high current pulsed electron beam." REVIEWS ON ADVANCED MATERIALS SCIENCE 59, no. 1 (2020): 514–22. http://dx.doi.org/10.1515/rams-2020-0047.

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AbstractIn this paper, the microstructure and wear resistance of Zr-17Nb alloy treated by high current pulsed electron beam were studied in detail. A phase change occurs after pulse treatments using X-Ray Diffraction (XRD) analysis, showing β (Nb) phase and α (Zr) phase transformed by a part of β (Zr, Nb) phase. Also, narrowing and shifting of β (Zr, Nb) diffraction peaks were found. Scanning Electron Microscope (SEM) and metallographic analysis results reveal that the microstructure of alloy surface before high current pulsed electron beam (HCPEB) treatment is composed of equiaxed crystals. B

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Achour, Yahia, Jacek Starzyński, and Jacek Rąbkowski. "Modular Marx Generator Based on SiC-MOSFET Generating Adjustable Rectangular Pulses." Energies 14, no. 12 (2021): 3492. http://dx.doi.org/10.3390/en14123492.

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The paper introduces a new design of Marx generator based on modular stages using Silicon Carbide MOSFETs (SiC-MOSFET) aimed to be used in biomedical applications. In this process, living cells are treated with intense nanosecond Pulsed Electrical Field (nsPEF). The electric field dose should be controlled by adjusting the pulse parameters such as amplitude, repetition rate and pulse-width. For this purpose, the structure of the proposed generator enables negative pulses with a quasi-rectangular shape, controllable amplitude, pulse-width and repetition-rate. A complete simulation study was con

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RUSTAMAJI, RUSTAMAJI, KANIA SAWITRI, and RUDI GUNAWAN. "Perancangan Prototipe Transmitter Beacon Black Box Locator Acoustic 37.5 kHz Pingers." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 4, no. 2 (2018): 170. http://dx.doi.org/10.26760/elkomika.v4i2.170.

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ABSTRAKPingers transmitter berfungsi untuk memancarkan sinyal atau getaran pulsa akustik pada black box. Frekuensi sinyal yang dipancarkan sebesar 37,5 kHz yang dimodulasikan oleh pulsa dengan durasi 10 ms setiap interval 1 second. Modulasi yang digunakan adalah modulasi on off keying. Dalam penelitian ini dibuat perancangan pingers transmitter yang tersusun atas rangkaian osilator, timer, inverter, switch dan rangkaian amplifier. Frekuensi 37,5 kHz tersebut dibangkitkan oleh rangkaian osilator colpitts, sedangkan lebar pulsa dengan durasi 10 ms dan pengulangan pulsa setiap interval 1 second d

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Dement’ev, A., and A. Jovaiša. "Pulse Shape Influence on the Accuracy of Z-scan Measurements." Nonlinear Analysis: Modelling and Control 10, no. 2 (2005): 119–36. http://dx.doi.org/10.15388/na.2005.10.2.15127.

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Although the laser pulses with durations ranging from nanoseconds to femtoseconds and various pulse shapes are utilized for the Z-scan measurements, the influence of the temporal pulse shape on the measurement results is often neglected. In this paper, we tried to differentiate the influence of the temporal pulse shape on the common Z-scan technique with a small on-axis aperture in two cases: when the pulse peak intensity at the beam waist is known (for relatively long pulses), or when the total pulse energy and full width at half maximum (FWHM) of the correlation functions or FWHM of pulse du

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Lee, Ju-Yeon, Min Jang, and Sang-Hoon Shin. "Study on the Depth, Rate, Shape, and Strength of Pulse with Cardiovascular Simulator." Evidence-Based Complementary and Alternative Medicine 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/2867191.

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Pulse diagnosis is important in oriental medicine. The purpose of this study is explaining the mechanisms of pulse with a cardiovascular simulator. The simulator is comprised of the pulse generating part, the vessel part, and the measurement part. The pulse generating part was composed of motor, slider-crank mechanism, and piston pump. The vessel part, which was composed with the aorta and a radial artery, was fabricated with silicon to implement pulse wave propagation. The pulse parameters, such as the depth, rate, shape, and strength, were simulated. With changing the mean pressure, the floa

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Rudenkov, A. S., V. E. Kisel, A. S. Yasukevich, K. L. Hovhannesyan, A. G. Petrosyan, and N. V. Kuleshov. "Yb:CALYO-based femtosecond chirped pulse regenerative amplifier for temporally resolved pump-probe spectroscopy." Devices and Methods of Measurements 9, no. 3 (2018): 205–14. http://dx.doi.org/10.21122/2220-9506-2018-9-3-205-214.

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Diode-pumped femtosecond chirped pulse regenerative amplifiers based on Yb3+-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the amplification of broadband chirped femtosecond pulses in regenerative amplifier based on Yb3+:CaYAlO4crystal.Such systems use femtosecond mode-locked lasers as seed pulse sources and amplify nJ-seed pulses to sub-mJ energy range. Most chirped pulse regenerative amplifier systems described in the literature use seed lasers with typical pulse spectral width at the level of 10–

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Tomasevic, I. "The effect of intense light pulses on the sensory quality and instrumental color of meat from different animal breeds." Biotehnologija u stocarstvu 31, no. 2 (2015): 273–81. http://dx.doi.org/10.2298/bah1502273t.

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Intense light pulses (ILP) are an emerging processing technology, which has a potential to decontaminate food products. The light generated by ILP lamps consists of a continuum broadband spectrum from deep UV to the infrared, especially rich in UV range below 400 nm, which is germicidal. Evaluation of the effect of intense light pulses (ILP) on sensory quality of meat, game and poultry was performed using two kinds of red meat (beef and pork), two kinds of poultry (chicken and turkey) and three game meat samples (deer, rabbit and kangaroo). All the samples were treated with 1 and 5 light pulse

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