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Journal articles on the topic 'PULSE CHARACTERISTICS'

Author: Grafiati

Published: 11 September 2023

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1

Zhang, Yangkai, and Qian Li. "Influence of Hydraulic Parameters on Multi-Stage Pulse Characteristics of Pressurized Pulsed Water Jet." Processes 11, no. 8 (2023): 2502. http://dx.doi.org/10.3390/pr11082502.

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The multi-stage pulse competition of pressurized pulsed water jet becomes the initial pulse at the head tip, and hydraulic parameters are the key parameters that affect the characteristics of multiple pulses. Based on the ultra-high-speed imaging system, a pressurized pulsed water jet flow field capture system was constructed, and the effects of initial pressure and driving pressure of the pressurized chamber on the characteristics of multi-stage pulses were studied. The experimental results show that as the initial pressure of the booster chamber increases, the jet changes from a discontinuou

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2

Su, Zhi, Haohua Zong, Hua Liang, Jun Li, and Xiancong Chen. "Characteristics of a dielectric barrier discharge plasma actuator driven by pulsed-DC high voltage." Journal of Physics D: Applied Physics 55, no. 7 (2021): 075203. http://dx.doi.org/10.1088/1361-6463/ac30bc.

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Abstract Dielectric barrier discharge using pulsed-DC high voltage (pulsed-DC DBD) have been proven to be capable of effectively reducing skin friction drag in turbulent boundary layers with limited power consumption, thus producing significant net power savings. In this work, the characteristics of pulsed-DC DBD, including power consumption, induced flow structure, thermal effect, and body force, are investigated sequentially. Both the power consumption and pressure waves produced by pulsed-DC DBD are similar to that of DBD using nanosecond pulses (ns-DBD), whereas the wall-bounded jet struct

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3

Seol, Youbin, Minsu Choi, Hongyoung Chang, and Shinjae You. "Study on OH Radical Production Depending on the Pulse Characteristics in an Atmospheric-Pressure Nanosecond-Pulsed Plasma Jet." Materials 16, no. 10 (2023): 3846. http://dx.doi.org/10.3390/ma16103846.

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Hydroxyl radicals (OH) play a crucial role in plasma-bio applications. As pulsed plasma operation is preferred, and even expanded to the nanosecond range, it is essential to study the relationship between OH radical production and pulse characteristics. In this study, we use optical emission spectroscopy to investigate OH radical production with nanosecond pulse characteristics. The experimental results reveal that longer pulses generate more OH radicals. To confirm the effect of pulse properties on OH radical generation, we conduct computational chemical simulations, focusing on two types of

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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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5

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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Shaburova, Nataliya, Valeriy Krymsky, and Ahmad Ostovari Moghaddam. "Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts." Materials 15, no. 3 (2022): 1235. http://dx.doi.org/10.3390/ma15031235.

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In industrial practice, various methods of external influences on metal melts are used. For example, vibration processing, exposure to ultrasound, and other physical fields. The main purpose of such influences is purposeful grinding of the metal structure, which contributes to the improvement of mechanical characteristics. The article presents an overview of research on pulse processing of ferrous and non-ferrous melts: processing with pulsed current, electromagnetic pulses and pulsed magnetic fields. The results of the analysis showed that, despite the different methods and devices used for t

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7

Wang, Fuyong, Zhipeng Qin, Jing Luo, Xiudong Zhou, and Bo Li. "Duration-controllable mid-infrared pulse from bias-pumped Er:ZBLAN fiber laser." Laser Physics 32, no. 1 (2021): 015102. http://dx.doi.org/10.1088/1555-6611/ac3d0f.

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Abstract We experimentally demonstrate the generation of duration-controllable pulses at 2.8 µm based on bias-pump technique for the first time. Bias-pumped by a 976 nm continuous-wave (CW)-pulsed combined laser, duration-controllable pulses are produced from an Er:ZBLAN fiber laser and the duration is entirely determined by the duration of pump pulse. Numerical simulations agree with experimental results well, and further predict that the temporal profile of output pulse from bias-pumped Er:ZBLAN fiber laser can also be identical with that of pump pulse under certain conditions. The pump-cont

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8

Kandratsyeu, Aleh, Uladzimir Sabaleuski, Luis Redondo, and Andrei G. Pakhomov. "Four Channel 6.5 kV, 65 A, 100 ns–100 µs Generator with Advanced Control of Pulse and Burst Protocols for Biomedical and Biotechnological Applications." Applied Sciences 11, no. 24 (2021): 11782. http://dx.doi.org/10.3390/app112411782.

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Pulsed electric fields in the sub-microsecond range are being increasingly used in biomedical and biotechnology applications, where the demand for high-voltage and high-frequency pulse generators with enhanced performance and pulse flexibility is pushing the limits of pulse power solid state technology. In the scope of this article, a new pulsed generator, which includes four independent MOSFET based Marx modulators, operating individually or combined, controlled from a computer user interface, is described. The generator is capable of applying different pulse shapes, from unipolar to bipolar

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9

Wang, Wen Bin, Dao Yuan Liu, and Yu Qin Yao. "Study of Transmission Characteristics of Optical Pulse in the Dispersive Fiber." Applied Mechanics and Materials 513-517 (February 2014): 2775–77. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2775.

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Chromatic dispersion and nonlinearity effect are the two important factors affecting the optical pulse which propagates in the optical fiber. The former makes the pulse broaden, the latter mainly broaden pulse spectrum. Therefore, the linear and nonlinear dispersive propagation and control of optical pulses in the fiber has always been an important research topic of concern. In this paper, Starting from the nonlinear Schrodinger equation of the optical pulse and neglecting the chromatic dispersion, under the situation of chirp and chirp-free Gaussian pulse, we analytical analyzed, calculated a

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10

Fujii, T., R. Gobbo, and M. Rea. "Pulse corona characteristics." IEEE Transactions on Industry Applications 29, no. 1 (1993): 98–102. http://dx.doi.org/10.1109/28.195894.

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11

Adhikari, Pitri Bhakta, and Aashutosh Adhikari. "Comparing the Wave Characteristics of Breakdown Pulses of the Lightning Waveforms in the Himalayan Region." Scientific World Journal 2021 (February 19, 2021): 1–9. http://dx.doi.org/10.1155/2021/6381439.

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We have analyzed the breakdown pulse train with or without the main event in this paper. Among the selected 81 flashes, 36 flashes are starting positively, and 45 are starting negatively. Also, 58 flashes contain positive pulses, and 67 flashes contain negative pulses, whereas 44 flashes contain both positive and negative pulses. Among these 81 flashes, 22 flashes follow the main events, and the rest are isolated events. In this study, we got the main duration of PB pulses as 1.94 ms and the time interval between the breakdown pulse and return stroke as 61.49 ms. On taking each pulse train, we

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12

Zhang, Chunlong, Chunying Li, Dongbo Lv, Hao Zhu, and Hongyan Xing. "An Experimental Study on the Effect of Multiple Lightning Waveform Parameters on the Aging Characteristics of ZnO Varistors." Electronics 9, no. 6 (2020): 930. http://dx.doi.org/10.3390/electronics9060930.

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In this study, in order to study the effect of multi-pulse waveform parameters on the aging characteristics of ZnO varistor, the aging rate and surface temperature rise of ZnO varistor under the impact of multi-pulse current were analyzed. The number of pulses and the pulse interval under multiple pulses play a decisive role in the aging rate of ZnO varistor. The greater the number of pulses and the smaller the pulse interval, the higher the temperature rise of the ZnO varistor and the faster the aging rate, the more likely to be failure and damage. The surface temperature distribution of the

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13

Gapeev, M. I., Yu I. Senkevich, and O. O. Lukovenkova. "Estimation of Probability Distributions of Geoacoustic Signal Characteristics." Journal of Physics: Conference Series 2096, no. 1 (2021): 012018. http://dx.doi.org/10.1088/1742-6596/2096/1/012018.

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Abstract The paper presents an estimation of probability distributions of geoacoustic signal characteristics. The studied signals have a pulsed nature. The ones have been recording at the geodynamic test site of the IKIR FEB RAS (Kamchatka Peninsula) for more than 20 years. To estimate the distribution of characteristics, such time intervals were determined in which histograms of the distribution did not change. The following characteristics were chosen for the estimation: maximum amplitude, the position of pulse envelope maximum, duration, filling frequency, and pulse-to-pulse interval. The o

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

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

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15

Luo, Han, Sijie Shen, Zhenzhen Wang, Junjie Yan, and Yoshihiro Deguchi. "Copper signal characteristics using collinear LS-DP-LIBS for underwater measurement." Journal of Laser Applications 35, no. 2 (2023): 022017. http://dx.doi.org/10.2351/7.0000940.

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The collinear long-short double-pulse laser-induced breakdown spectroscopy (LS-DP-LIBS) was employed in the detection of underwater copper samples. Discrete emission lines were obtained using LS-DP-LIBS with an appropriate delay between two pulses, while characteristic emission lines were covered by continuous background and noise using LIBS with a single pulse. In the condition of LS-DP-LIBS, signal characteristics of the measured spectra at different experimental parameters including long-pulse width, lens-to-sample distance (LTSD), and long-pulse energy have been investigated to determine t

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Zhang, Qian, Zhiheng Liu, Deling Lin, Yuzhe Hu, Borui Zheng, and Taifei Zhao. "Analysis of discharge characteristics of pulsed plasma power source in the microsecond scale." Journal of Physics: Conference Series 2313, no. 1 (2022): 012023. http://dx.doi.org/10.1088/1742-6596/2313/1/012023.

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Abstract The characteristics test of plasma discharge is an essential physical basis for studying plasma flow control. The power consumption of pulsed plasma aerodynamic actuation is 30% lower than when the actuation voltage is a continuous sine wave. This paper uses a self-developed pulsed plasma power source to superimpose DC. The power source conducts the discharge measurement on the sliding discharge plasma. The experimental results show that the power source effectively outputs 0-20 kV pulsed high voltage. The superimposed DC power source generates a negative DC high voltage, accelerating

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17

Zhang, Zhenqing, Fusheng Deng, Feng Wu, and Chengjie Zhu. "Dynamical characteristics of ultrashort terahertz pulse in metamaterials." Laser Physics Letters 19, no. 5 (2022): 056001. http://dx.doi.org/10.1088/1612-202x/ac59bc.

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Abstract We develop a time-dependent theoretical approach to study the interaction between the ultrashort terahertz pulse and the metamaterials beyond the steady-state approximation. By using photoconductive silicon, we show that the system dispersion is changed from abnormal to normal via the classical interference effect. As a result, the terahertz pulse propagates through the material with subluminal/superluminal group velocity. We show that it is not accurate to predict the propagation characteristics of the terahertz pulses by using the steady-state solution of coupled wave equations, and

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18

Wang, De Qiang, Shi Liang Dong, and Yuan Jun Zhou. "Analysis of the 18-Pulse ATRU Filtering Characteristics Applied to the Pulse Load." Applied Mechanics and Materials 373-375 (August 2013): 1573–77. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.1573.

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A popular harmonic current reduction method specifically is to increase the number of rectification pulses such as 18-pulse ATRU. This paper presents a 2-order Butterworth LC filter designed to suppress the DC output voltage ripple of the ATRU. And an EMI filter is designed to overcome the electromagnetic interference caused by the high frequency pulse load. Because of the same position and configuration, the same filter is verified in theory to achieve both purposes. Finally, a simulation model of 18-pulse ATRU is built and the two filter's characteristics in the time domain are tested and an

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19

Endo, Fumihiko, Kaoru Atsumi, Katsuya Okamura, Yukio Watanabe, Eiji Kaneko, and Iwao Ohshima. "Pulse Switching Characteristics of MAGTs for Pulsed Power Applications." IEEJ Transactions on Industry Applications 113, no. 4 (1993): 445–52. http://dx.doi.org/10.1541/ieejias.113.445.

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20

Endo, Fumihiko, Kaoru Atsumi, Katsuya Okamura, Yukio Watanabe, Eiji Kaneko, and Iwao Ohshima. "Pulse switching characteristics of MAGTs for pulsed power applications." Electrical Engineering in Japan 114, no. 5 (1994): 108–18. http://dx.doi.org/10.1002/eej.4391140513.

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21

Mir, Hanan, Fabian Meyer, Andreas A. Brand, Katrin Erath-Dulitz, and Jan Frederik Nekarda. "Study of GHz-Burst Femtosecond Laser Micro-Punching of 4H-SiC Wafers." Solid State Phenomena 344 (June 6, 2023): 29–33. http://dx.doi.org/10.4028/p-q6725d.

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The micromaching of silicon carbide using femtosecond laser pulses is becoming an important field of research. High-repetition-rate sub-pulse trains, so-called pulse bursts, are a particularly promising route towards completely new process regimes. We report on the results of micro-punching n-type 4H-silicon carbide wafers using GHz pulse burst in order to systematically investigate the influence of the temporal energy distribution on laser processing. Pulse-burst experiments are performed at a laser wavelength of λ= 1030 nm using a single GHz burst containing a varying number of pulses and th

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22

Mamedov, N. V., A. S. Rohmanenkov, and A. A. Solodovnikov. "Magnetic field influence on the Penning discharge characteristics." Journal of Physics: Conference Series 2064, no. 1 (2021): 012039. http://dx.doi.org/10.1088/1742-6596/2064/1/012039.

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Abstract In this work characteristics of pulsed penning ion source for miniature linear accelerators was investigated by experimental measurements and PIC (Particle-In-Cell) simulations. The paper presents dependences of the discharge current and extracted current on intensities of the uniform magnetic field for different pressure. Also, typical examples of the current pulse waveforms obtained by PIC simulation and experiment for different magnetic field are presented. The simulated electron and ion distributions inside discharge gap give qualitative explanation of the experimentally observed

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23

WANG, P. X., Y. K. HO, Q. KONG, X. Q. YUAN, N. CAO, and L. FENG. "CHARACTERISTICS OF GeV ELECTRON BUNCHES ACCELERATED BY INTENSE LASERS IN VACUUM." Modern Physics Letters B 14, no. 19 (2000): 693–99. http://dx.doi.org/10.1142/s0217984900000902.

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This paper studies the characteristics of GeV electron bunches driven by ultra-intense lasers in vacuum based on the mechanism of capture and violent acceleration scenario [CAS, see, e.g. J. X. Wang et al., Phys. Rev.E58, 6575 (1998)], which shows an interesting prospect of becoming a new principle of laser-driven accelerators. It has been found that the accelerated GeV electron bunch is a macro-pulse composed of a lot of micro-pulses, which is analogous to the structure of the bunches produced by conventional linacs. The macro-pulse corresponds to the duration of the laser pulse while the mic

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Stühmeier-Niehe, Corinna, Luca Lass, Miriam Brocksieper, Panagiotis Chanos, and Christian Hertel. "Pre-Treatment of Starter Cultures with Mild Pulsed Electric Fields Influences the Characteristics of Set Yogurt." Foods 12, no. 3 (2023): 442. http://dx.doi.org/10.3390/foods12030442.

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The aim of this study was to investigate the effect of pulsed electric field (PEF) pre-treatment of a dairy starter culture of Lactobacillus delbrueckii subsp. bulgaricus LB186 and Streptococcus thermophilus ST504 on the fermentation and final product characteristics of set-style yogurt. The effects of PEF treatment parameters, voltage (4–20 kV), pulse number (20–80 pulses), frequency (1–21 Hz), and pulse (5–8 µs) width on pH development, cell counts, and proteolytic activity, as well as on texture and degree of syneresis in yogurt were investigated by use of a two-level full factorial design.

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Antonov, Alexander, Irina Matveeva, Igor Shubin, and Ilya Tsukernikov. "CALCULATION OF IMPULSE NOISE WITH MIRROR-DIFUSE REFLECTION OF SOUND FROM FENCES." Akustika 34 (November 1, 2019): 88–94. http://dx.doi.org/10.36336/akustika20193488.

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The choice and acoustic efficiency of construction and acoustic means of noise control is determined on the basis of calculations of changes in the spatio-temporal characteristics of the pulses of sound energy emitted by the sound source. The paper proposes a combined computational model for estimating the energy characteristics of pulse noise and their spatiotemporal changes. The model describes the formation and distribution of the reflected sound energy of pulses in the mirror-scattered reflection of sound from the fences. The principles of construction of the computational model and the co

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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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Asayonak, M. A., A. O. Zenevich, Ya V. Novikau, and S. A. Saroca. "Influence of optical radiation parameters on the amplitude characteristics of silicon photoelectron multipliers." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 65, no. 1 (2020): 104–9. http://dx.doi.org/10.29235/1561-8358-2020-65-1-104-109.

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At present, silicon photoelectronic multipliers with a low voltage, high sensitivity in the visible and near infrared spectral regions, and large amplification factors are often used to record optical radiation in a wide range of intensities of the visible and near infrared spectral regions. The purpose of this article is to determine the dependence of the type of amplitude distribution of pulses, created by silicon photoelectronic multipliers, on the intensity of the recorded optical radiation. As research objects, commercially available Ketek PM 3325 and ON Semi FC 30035 silicon photomultipl

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Shtreker, Denis, Mikhail Polishchuck, and Arkadii Popov. "Influence of the shaper parameters on the characteristics of acceleration pulses reproduced by mechatronic shock machines." E3S Web of Conferences 326 (2021): 00004. http://dx.doi.org/10.1051/e3sconf/202132600004.

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In this paper the influence of the shaper parameters on the characteristics of acceleration pulses (peak value and duration) reproduced on mechatronic shock machines is analyzed. A comparison of the acceleration pulses obtained experimentally and by computational methods is presented. Recommendations for clarifying the requirements for methodological calculations of pulse parameters are given. The dependence of the elastic force of the shock pulse shaper on its deformation is presented. The influence of this characteristic on the peak value and duration of the acceleration pulse is estimated.

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Wei, Chao, Yuping Ma, Yuan Han, Yao Zhang, Liu Yang, and Xuehui Chen. "Study on Femtosecond Laser Processing Characteristics of Nano-Crystalline CVD Diamond Coating." Applied Sciences 9, no. 20 (2019): 4273. http://dx.doi.org/10.3390/app9204273.

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Ultra-short pulse laser interaction with diamond materials has attracted extensive interest in micro- and nano-machining, especially for the fabrication of micro tools, because of the straightforward method and high precision. Thanks to the development of chemical vapor deposition (CVD) technology, high-quality CVD diamonds are employed in more varieties of tools as performance-enhancing coatings. The purpose of the experiments reported here was to explore the machinability of CVD diamond coating under the irradiation of femtosecond (fs) pulsed laser. The factor-control approach was adopted to

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Chen, Zhiwen, Yingying Yan, Jun Shu, Kefu Liu, and Jian Qiu. "Modulated High Power and Narrow Pulse Width Laser Drive Circuit for Lidar System." Electronics 10, no. 7 (2021): 823. http://dx.doi.org/10.3390/electronics10070823.

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This manuscript introduces a laser drive circuit for a light detection and ranging (Lidar) system. A Lidar system usually requires its drive circuit to provide laser pulses with nanosecond pulse width, >100 W peak power and high repetition frequency. However, the existing research results show difficulties in meeting these requirements. In order to reduce the pulse width and increase the peak power of laser pulses, special circuit design and component selection are used to optimize the parasitic parameters of the drive circuit, and GaN devices are used to increase the switching speed. The c

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Wang, Anran, Lin Yang, Chengyu Liu, et al. "Athletic Differences in the Characteristics of the Photoplethysmographic Pulse Shape: Effect of Maximal Oxygen Uptake and Maximal Muscular Voluntary Contraction." BioMed Research International 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/752570.

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This study aimed to investigate the athletic differences in the characteristics of the photoplethysmographic (PPG) pulse shape. 304 athletes were enrolled and divided into three subgroups according to a typical sport classification in terms of the maximal oxygen uptake (MaxO2_low, MaxO2_middle and MaxO2_high groups) or the maximal muscular voluntary contraction (MMVC_low, MMVC_middle, and MMVC_high groups). Finger PPG pulses were digitally recorded and then normalized to derive the pulse area, pulse peak timeTp, dicrotic notch timeTn, and pulse reflection index (RI). The four parameters were f

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Du, Gai Hong, and Yang Meng Tian. "The Coupling Effect of Electromagnetic Pulse and Computer." Applied Mechanics and Materials 541-542 (March 2014): 452–57. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.452.

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Coupling characteristic of EM pulse into the computer enclose with aperture and the coupling effect of electromagnetic pulse and computer box are studied. The impact of coupling characteristic of EM pulse into the computer enclose with aperture includes the three aspects (1) the effect of hole shape on the coupling characteristics (2) the effects of the apertures area on the coupling property characteristics (3) the effects of the polarization direction of the electromagnetic pulse on the coupling characteristics; The brief overview of electromagnetic pulse coupling phenomena on the computer i

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Razhev A M, Kargapol`tsev E. S., and Trunov I. A. "Pulsed RF excitation inductive discharge CO-=SUB=-2-=/SUB=- laser with the radiation energy of 1 J and high efficiency." Optics and Spectroscopy 132, no. 3 (2022): 368. http://dx.doi.org/10.21883/eos.2022.03.53559.2836-21.

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An efficient pulsed gas-discharge inductive CO2-laser with a radiation energy of 1.05 J has been developed for the first time. In this case, the pulse duration of the laser radiation was about 10 msec. The maximum efficiency of 21.1% was obtained at a radiation energy of 340 mJ. RF current pulses propagated along the inductor conductor and, thus, an inductive discharge was formed to create an inverse population at the infrared (IR) transitions of CO2* molecules. The temporal and energy characteristics of the radiation of the inductive CO2-laser depending on the duration of the pump pulse are i

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Lin, Munan, Jianbin Zhu, Wenqing Zhang, Yu Bao, Haibo Li, and Xin Qi. "A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS." Journal of Instrumentation 18, no. 07 (2023): T07005. http://dx.doi.org/10.1088/1748-0221/18/07/t07005.

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Abstract A solid-state inductive adder-based quasi-rectangular pulser featuring a low characteristic impedance has been developed in the laboratory to demonstrate the technical viability of using such a pulser for the HEMS muon source. The pulser consists of five layers connected in series, with each layer comprising 24 parallel branches. The paper mainly presents the design of the low characteristic impedance quasi-rectangular pulser from three aspects: primary driver circuit, coaxial central structure and transformer magnetic core. The experimental results show that through the careful desig

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Xia, Xinfan, Lihua Liu, Shengbo Ye, Hongfei Guan, and Guangyou Fang. "A Novel Subnanosecond Monocycle Pulse Generator for UWB Radar Applications." Journal of Sensors 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/150549.

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A novel ultra-wideband (UWB) monocycle pulse generator with good performance is designed and demonstrated in this paper. It contains a power supply circuit, a pulse drive circuit, a unique pulse forming circuit, and a novel monopolar-to-monocycle pulse transition circuit. The drive circuit employs wideband bipolar junction transistors (BJTs) and linear power amplifier transistor to produce a high amplitude drive pulse, and the pulse forming circuit uses the transition characteristics of step recovery diode (SRD) effectively to produce a negative narrow pulse. At last, the monocycle pulse formi

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Chen, Ping, Jin Miao, Yin Gu, et al. "Comparative Study on Characteristics of Partial Discharge Optical Pulse and UHF Pulse in Switch Equipment." Journal of Physics: Conference Series 2136, no. 1 (2021): 012024. http://dx.doi.org/10.1088/1742-6596/2136/1/012024.

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Abstract The article explores the performance of the new silicon photoelectric sensor in partial discharge detection, and compares the measured optical pulse with the traditional UHF pulse. Through optical and electrical synchronous partial discharge experiments, the article analyzes and discusses the detection performance, working characteristics and statistical characteristics of various sensors, and explores the advantages and feasibility of silicon photoelectric partial discharge sensors in actual discharge monitoring; In addition, the statistical performance of the two physical phenomena

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Chen, Gao. "Isolated attosecond pulse generation from helium atom irradiated by a three-color laser pulse." Acta Physica Sinica 71, no. 5 (2022): 054204. http://dx.doi.org/10.7498/aps.71.20211502.

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Isolated attosecond pulses enables the studying and controlling of ultrafast electron processes in atoms and molecules. High-order harmonic generation (HHG) is the most promising way to generate such pulses, benefiting from the broad plateau structure of the typical HHG spectrum. We theoretically investigate high-order harmonic and attosecond pulse generation from helium atom in a three-color laser field, which is synthesized by 16 fs/1600 nm, 15 fs/1100 nm and 5 fs/800 nm pulse laser. Compared with harmonic spectrum generated by a two-color laser field synthesized by 16 fs/1600 nm and 15 fs/1

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38

Geyer, M., M. Serylak, F. Abbate, et al. "The Thousand-Pulsar-Array programme on MeerKAT – III. Giant pulse characteristics of PSR J0540−6919." Monthly Notices of the Royal Astronomical Society 505, no. 3 (2021): 4468–82. http://dx.doi.org/10.1093/mnras/stab1501.

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ABSTRACT PSR J0540−6919 is the second-most energetic radio pulsar known and resides in the Large Magellanic Cloud. Like the Crab pulsar, it is observed to emit giant radio pulses (GPs). We used the newly commissioned PTUSE instrument on the MeerKAT radio telescope to search for GPs across three observations. In a total integration time of 5.7 h, we detected 865 pulses above our 7σ threshold. With full polarization information for a subset of the data, we estimated the Faraday rotation measure, $\rm {RM}=-245.8 \pm 1.0$ rad m−2 towards the pulsar. The brightest of these pulses is ∼60 per cent l

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Ambigaipalan, P., R. Hoover, E. Donner, and Q. Liu. "Retrogradation characteristics of pulse starches." Food Research International 54, no. 1 (2013): 203–12. http://dx.doi.org/10.1016/j.foodres.2013.06.012.

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Qin, Feng, Wei Chen, Xutong Wang, Tao Huang, Zhitong Cui, and Xin Nie. "Transient Response Characteristics of Metal Oxide Arrester under High-Altitude Electromagnetic Pulse." Energies 15, no. 9 (2022): 3303. http://dx.doi.org/10.3390/en15093303.

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In order to study the strong electromagnetic pulse effect of critically vulnerable equipment in power systems and evaluate the survivability under high-altitude electromagnetic pulses, it is necessary to study the characteristics of the transient response of metal oxide arresters to the high-altitude electromagnetic pulse by experiment. In this paper, an experimental platform for high-altitude electromagnetic pulse conduction current injection for a typical 10 kV metal oxide arrester was set up, and the key parameters such as peak value of overshoot voltage, peak value of residual voltage, act

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41

Ражев, А. М., Е. С. Каргапольцев та И. А. Трунов. "Импульсный индукционный CO-=SUB=-2-=/SUB=--лазер с энергией излучения 1 J и высоким КПД с ВЧ возбуждением". Оптика и спектроскопия 130, № 3 (2022): 400. http://dx.doi.org/10.21883/os.2022.03.52169.2836-21.

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An efficient pulsed gas-discharge inductive CO2-laser with a radiation energy of 1.05 J has been developed for the first time. In this case, the pulse duration of the laser radiation was about 10 msec. The maximum efficiency of 21.1% was obtained at a radiation energy of 340 mJ. RF current pulses propagated along the inductor conductor and, thus, an inductive discharge was formed to create an inverse population at the infrared (IR) transitions of CO2* molecules. The temporal and energy characteristics of the radiation of the inductive CO2-laser depending on the duration of the pump pulse are i

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Lebedev, V., G. Zuck G., and M. Brykov. "PERFORMANCE CHARACTERISTICS OF NICKEL-CONTAINING STEEL STRUCTURES DURING MECHANIZED WELDING-SURFACING WITH MODIFIED (DOSED) ELECTRODE WIRE FEEDING." Innovative Materials and Technologies in Metallurgy and Mechanical Engineering, no. 1 (June 28, 2022): 36–48. http://dx.doi.org/10.15588/1607-6885-2022-1-5.

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Purpose. To study and analyze in a comparative order the influence of factors of the controlled pulse process of electrode wire supply on some basic mechanical characteristics of seams and welded rollers in the processes of welding and surfacing of nickel-containing steels. Methods of research. The study the mechanical characteristics of seams and welded rollers was carried out using modern laboratory equipment and appropriate techniques. This made it possible to determine how the pulse feed parameters affect the strength characteristics of the weld and near the weld zone over the entire

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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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Egoryan, A. J., A. N. Kraiko, K. S. P’yankov, and A. P. Tishin. "Characteristics of pulse detonation engine versus ramjet characteristics." Thermophysics and Aeromechanics 23, no. 2 (2016): 297–300. http://dx.doi.org/10.1134/s0869864316020177.

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Kun Cheng, Kun Cheng, Sujuan Zhang Sujuan Zhang, Wei Li Wei Li, Wanjun Dai Wanjun Dai, Dongxia Hu Dongxia Hu, and Feng Jing Feng Jing. "Temporal self-modifying characteristics of pulse propagation in multiphoton absorbers." Chinese Optics Letters 13, no. 7 (2015): 070009–70012. http://dx.doi.org/10.3788/col201513.070009.

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Ditchek, Sarah D., Kristen L. Corbosiero, Robert G. Fovell, and John Molinari. "Electrically Active Diurnal Pulses in Hurricane Harvey (2017)." Monthly Weather Review 148, no. 6 (2020): 2283–305. http://dx.doi.org/10.1175/mwr-d-20-0022.1.

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Abstract Recent research has found that diurnal pulses are ubiquitous features of tropical cyclones. To gain further insight into the characteristics of these pulses, a case study of an electrically active (ACT) cooling pulse and an off-the-clock ACT cooling pulse that occurred in Hurricane Harvey (2017) was conducted. Using GridSat-B1 IR brightness temperatures, World Wide Lightning Location Network (WWLLN) lightning data, the 85–91-GHz channels on microwave satellite imagers, and Level-II Doppler radar reflectivity data from WSR-88D stations (i.e., NEXRAD), these pulses were found to share m

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Morozov, Yu V., M. A. Rajfeld, and A. A. Spektor. "NOISE AND TARGET SIGNALS SIMULATION IN PASSIVE SEISMIC LOCATION SYSTEMS." Issues of radio electronics, no. 4 (April 20, 2018): 73–78. http://dx.doi.org/10.21778/2218-5453-2018-4-73-78.

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The paper proposes the model of a person seismic signal with noise for the investigation of passive seismic location system characteristics. The known models based on Gabor and Berlage pulses have been analyzed. These models are not able wholly to consider statistical properties of seismic signals. The proposed model is based on almost cyclic character of seismic signals, Gauss character of fluctuations inside a pulse, random amplitude change from pulse to pulse and relatively small fluctuation of separate pulses positions. The simulation procedure consists of passing the white noise through a

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Wiatrowski, A., and W. M. Posadowski. "The impact of medium frequency pulsed magnetron discharge power on the single probe Langmuir measurements and resulted plasma parameters." Materials Science-Poland 34, no. 2 (2016): 374–85. http://dx.doi.org/10.1515/msp-2016-0012.

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AbstractThe resonant type power supplies of medium frequency designed for magnetron sputtering processes often use pulse density modulation to regulate the average discharge power level. While the output power level changes then number of pulses in a group changes, but the discharge current pulses are the same from pulse to pulse: their parameters (duration time, amplitude) do not change with the discharge power. The goal of this paper is to present the influence of medium frequency discharge power level on the direct current I-V characteristics of a single Langmuir probe and resulting plasma

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Scharnholz, Sigo, Ralf Hassdorf, Gontran Pâques, Bertrand Vergne, and Dominique Planson. "Pulse Current Characterization of SiC GTO Thyristors with Etched JTE." Materials Science Forum 740-742 (January 2013): 986–89. http://dx.doi.org/10.4028/www.scientific.net/msf.740-742.986.

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In this paper we highlight our latest results on high voltage SiC thyristors comprising an etched JTE. Compared to our previous design concepts, the thyristors described here are larger in size and have been investigated regarding pulsed power applications. Quasi-static on-state characteristics show that the devices withstand a repetitive current load of up to 16 A corresponding to a current density of 825 A/cm2. Their switching behavior was evaluated up to 1000 V demonstrating characteristic waveforms at turn-on and gate turn-off. Moreover, pulsed current characteristics show that the typical

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King, Emma, Deirdre M. Cobbin, Sean Walsh, and Damien Ryan. "The Reliable Measurement of Radial Pulse Characteristics." Acupuncture in Medicine 20, no. 4 (2002): 150–59. http://dx.doi.org/10.1136/aim.20.4.150.

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The use of the radial pulse as a diagnostic tool is an integral part of the Traditional Chinese Medicine (TCM) patient evaluation. In spite of its long history of use, there is little systematic information available to support the many claims about the relationship between pulse qualities and physiological condition contained in the ancient Chinese texts and echoed in modern pulse terminology. This study reports the development of a reliable means of measuring and recording pulse characteristics. This was achieved by reporting on the physical sensations that are detected under the fingertips

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