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Journal articles on the topic 'Pulsed pressure'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

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 finally, the steep narrowed pulse of pulsed power supply can be used to stabilize the output of the pulsed front.

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2

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 (October 29, 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 that the pulsed electron beam transport depends on the geometry of the current-conducting inserts in a drift tube. The direction of the pulsed electron beam propagation can be regulated by changing the geometry of the current-conducting insert. The experimental research was verified by theoretical calculations.

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3

Hudlicky, Tomas, Mary Endoma-Arias, and Ian Brindle. "Time-Pulsed Vacuum and Time-Pulsed Alternating Pressure Chromatography." Synlett 25, no. 01 (November 13, 2013): 58–63. http://dx.doi.org/10.1055/s-0033-1340306.

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4

Ali, Syed Sadiq, Ebrahim H. Al-Ghurabi, Abdelhamid Ajbar, Yahya A. Mohammed, Mourad Boumaza, and Mohammad Asif. "Effect of Frequency on Pulsed Fluidized Beds of Ultrafine Powders." Journal of Nanomaterials 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/4592501.

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Deagglomeration of ultrafine powders poses an important challenge towards their efficient and effective utilization. In the present study, we investigate the effect of frequency on the hydrodynamics of pulsed fluidized beds of ultrafine powders that show strong agglomeration behavior. We have carefully selected square waves of three different frequencies: 0.05 Hz, 0.10 Hz, and 0.25 Hz. The lowest frequency used here allowed the fluidized bed to settle completely before another pulse was introduced whilst the highest frequency ensured that the bed remained in a state of continuous turbulence between occurrences of consecutive pulses. On the other hand, the intermediate frequency pulse was just sufficient to complete the process of bed collapse before the start of the next pulse. Both local and global bed dynamics in all the three cases were rigorously monitored using fast response pressure transducers. The pressure transient data during the bed collapse were processed using the bed collapse model reported in the literature to compute the effective hydrodynamic diameter of agglomerates. Though there was substantial decrease in the agglomerate size, the effect of the frequency appeared to be rather insignificant as the global pressure transients remained rather insensitive to the change of the fluidization velocity.

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5

Osipov, V. V., and V. M. Orlovsky. "High-pressure pulsed CO2 lasers." Russian Physics Journal 43, no. 5 (May 2000): 358–66. http://dx.doi.org/10.1007/bf02508517.

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6

Makarov, Maxime, Youssef Loumani, and Andrei Kozyrev. "Pulsed low-pressure wire discharge." Journal of Applied Physics 100, no. 3 (August 2006): 033301. http://dx.doi.org/10.1063/1.2219154.

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7

Okazaki, Ken, and Tomohiro Nozaki. "Ultrashort pulsed barrier discharges and applications." Pure and Applied Chemistry 74, no. 3 (January 1, 2002): 447–52. http://dx.doi.org/10.1351/pac200274030447.

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Atmospheric pressure nonequilibrium plasmas have made a recent remarkable progress in formation techniques including atmospheric pressure glow discharge (APG), dielectric barrier discharge (DBD), corona discharge, surface discharge, ultrashort pulsed discharge, etc., and are expanding their applications into the field of energy and environment as well as material conversion processes. This paper will especially focus on a large improvement of DBD by combining it with squared ultrashort high voltage pulses and various applications.

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8

Makarov, G. N. "Pressure-shock-controlled pulsed molecular beams." Technical Physics 47, no. 12 (December 2002): 1495–500. http://dx.doi.org/10.1134/1.1529937.

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9

Sun, Dan, Martin F. Naud, Doan N. Nguyen, Jonathan B. Betts, John Singleton, and Fedor F. Balakirev. "Composite pressure cell for pulsed magnets." Review of Scientific Instruments 92, no. 2 (February 1, 2021): 023903. http://dx.doi.org/10.1063/5.0025557.

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10

LÓPEZ-CABALLERO, M. E., M. PÉREZ-MATEOS, P. MONTERO, and A. J. BORDERÍAS. "Oyster Preservation by High-Pressure Treatment." Journal of Food Protection 63, no. 2 (February 1, 2000): 196–201. http://dx.doi.org/10.4315/0362-028x-63.2.196.

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The purpose of this study was to analyze the effect of 10-min continuous pressure and pulsed pressure in two 5-min steps (400 MPa at 7°C) on the microbial flora, total volatile bases, pH, and texture of purified and unpurified oysters. High-pressure treatment reduced the number of all the target microorganisms (total viable count, H2S-producing microorganisms, lactic acid bacteria, Brochothrix thermosphacta, and coliforms), in some cases by around 5-log units. The difference between the counts in the control and the pressurized oysters remained stable throughout 41 days of storage at 2°C. No Salmonella spp. were detected in either the control batch or the pressurized batches during this storage period. Deterioration of the oyster was accompanied by increased total volatile bases, mainly in the nonpressurized samples. The pH was practically constant in the pressurized oysters and fell slightly in unpressurized samples. As for mechanical properties, shear strength values were higher in pressurized than in unpressurized oysters. Step-pulse pressurizing (400 MPa at 7°C in two 5-min pulses) produced no apparent advantages over continuous pressurizing based on any of the indices used.

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11

Yan, Hao, Jixiong Zhang, Nan Zhou, and Junli Chen. "The Enhancement of Lump Coal Percentage by High-Pressure Pulsed Hydraulic Fracturing for Sustainable Development of Coal Mines." Sustainability 11, no. 10 (May 14, 2019): 2731. http://dx.doi.org/10.3390/su11102731.

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The enhancement of lump coal percentage (LCP) is of great significance for most aging mines to achieve the production reduction and quality improvement. In order to enhance the LCP of hard coal seam in fully mechanized mining face and prolong the service life of aging mines, this paper puts forward the technological path of LCP enhancement using high-pressure pulsed hydraulic fracturing (HPPHF) based on the detailed analysis of the main factors controlling LCP. By analyzing the correlation between coal fracturing and LCP, the enhancement mechanism of LCP through HPPHF was concluded. Using the extended finite element method, a fluid–solid coupling numerical model of high-pressure pulsed water injection into coal seam was established, and effects of the fracturing method, pulse amplitude, pulse frequency, and water injection pressure on fracturing performance were assessed. Simulation results demonstrate that HPPHF can effectively reduce the required maximum pressure in fracturing, thus providing a higher percentage of coal lumps with lower energy consumption through the repeated pulsed loading of coal masses. Variations in pulsed pressure amplitude and frequency, as well as water injection pressure were positively correlated with fracturing performance. By their effect on the fracturing performance, we found that water injection pressure had the greatest influence, and the pulse amplitude and frequency had similar effects. At the same time, “high amplitude-high frequency” and “high amplitude-low frequency” had characteristics of short initiation time, large initiation pressure, but small fracture width, while “low amplitude-high frequency” and “low amplitude-low frequency” had characteristics of slow initiation speed, low initiation pressure, but large fracture width. Through the field test results in the fully mechanized mining face of Shichangwan Coal Mine, it was found that LCP with a diameter range of 13–100 mm was significantly enhanced by HPPHF. The present study is considered quite instrumental in providing a theoretical foundation for enhancing the LCP of hard coal seams and the sustainable development of coal mine enterprises.

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12

Ponomarev, A. V., A. V. Spyrina, Y. I. Mamontov, V. N. Volkhina, T. V. Zakirov, and E. S. Ioshchenko. "Atmospheric Pressure Plasma Generation System Based on Pulsed Volume Discharge for the Biological Decontamination of a Surface." PLASMA PHYSICS AND TECHNOLOGY 3, no. 3 (February 14, 2016): 140–46. http://dx.doi.org/10.14311/ppt.2016.3.140.

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The research introduces a system for pulsed volume discharges ignition at atmospheric pressure within gaps reaching 125 mm. The corona discharge is used for the volume discharge initiation. A damping oscillations pulse generator is used as a high-voltage power supply. The pulse repetition rate reaches 1 kHz, while the rate of damping high-frequency harmonic oscillations can reach megahertz units. The volume discharge electric and spectral characteristics were analyzed. The study revealed that O<sub>2</sub><sup>+</sup> emission spectrum dominates in the UV region. The potential of using pulsed volume discharge for cleaning biological surfaces was demonstrated in the research. The survival rate for E. coli under the influence of 15 seconds long pulsed volume discharge has decreased by 30 times.

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13

Köster, C., J. Grotemeyer, and E. W. Schlag. "A High Pressure Pulsed Expansion Valve for Gases, Liquids, and Supercritical Fluids." Zeitschrift für Naturforschung A 45, no. 11-12 (December 1, 1990): 1285–92. http://dx.doi.org/10.1515/zna-1990-11-1210.

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Abstract A novel design of a pulsed valve for coupling chromatographic techniques with gaseous and liquid mobile phases to a time-of-flight mass spectrometer with multiphoton ionization (MUPI) is presented. The valve can be operated in low pressure regions ( <10 bar) up to temperatures of 350 °C and at higher pressures (300 bar) up to temperatures of 200 °C. Pulse widths lower than 100 μs could be measured. First results demonstrate the ability of interfacing of liquid chromatography to MUPI-mass spectrometry. Additional coupling of CO2-laser desorption to the valve allows the interface to be used for mass spectrometric measurements of nonvolatile biomolecules.

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14

Wang, Shi Quan, Shu Cai Wang, Yi Peng Zhang, and Rong Zhang. "Research on Quick Salting Duck Egg with Pulsed Pressure and Water Cycle Technology." Applied Mechanics and Materials 422 (September 2013): 94–99. http://dx.doi.org/10.4028/www.scientific.net/amm.422.94.

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A pulsed pressure-water cycle technology was applied to accelerate the salting process. Effects of pulse pressure amplitude, high pressure holding time/atmospheric pressure holding time ratio and water cycle acting time on salt contents of duck white and duck yolk were studied by single factor and orthogonal array design methods. The experimental results showed that during the 3 day salting with 24% Salt solution under 30 °C. To obtain optimal quality of salted eggs and the optimum mass transfer rate, solution was obtained under the following conditions: pulse pressure amplitude was 140 kpa and high pressure holding time/ atmospheric pressure holding time ratio was 8:16min, water cycle pulsation ratio was 2:10 min, and the water cycle acting time was 132 min.

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15

Nakagawa, Atsuhiro, Takayuki Hirano, Hidefumi Jokura, Hiroshi Uenohara, Tomohiro Ohki, Tokitada Hashimoto, Viren Menezes, et al. "Pulsed holmium:yttrium-aluminum-garnet laser—induced liquid jet as a novel dissection device in neuroendoscopic surgery." Journal of Neurosurgery 101, no. 1 (July 2004): 145–50. http://dx.doi.org/10.3171/jns.2004.101.1.0145.

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Object. A pressure-driven continuous jet of water has been reported to be a feasible tool for neuroendoscopic dissection owing to its superiority at selective tissue dissection in the absence of thermal effects. With respect to a safe, accurate dissection, however, continuous water flow may not be suitable for intraventricular use. The authors performed experiments aimed at solving problems associated with continuous flow by using a pulsed holmium:yttrium-aluminum-garnet (Ho:YAG) laser-induced liquid jet (LILJ). They present this candidate neuroendoscopic LILJ dissection system, having examined its mechanical characteristics and evaluated its controllability both in a tissue phantom and in a rabbit cadaveric ventricle wall. Methods. The LILJ generator was incorporated into the tip of a No. 4 French catheter so that the LILJ could be delivered via a neuroendoscope. Briefly, the LILJ was generated by irradiating an internally supplied column of physiological saline with a pulsed Ho:YAG laser (pulse duration time 350 µsec; laser energy 250–700 mJ/pulse) within a No. 4 French catheter (internal diameter 1 mm) and ejecting it from a metal nozzle (internal diameter 100 µm). The Ho:YAG laser energy pulses were conveyed by an optical fiber (core diameter 400 µm) at 3 Hz, whereas physiological saline (4°C) was supplied at a rate of 40 ml/hour. The mechanical characteristics of the pulsed LILJ were investigated using high-speed photography and pressure measurements; thermal effects and controllability were analyzed using an artificial tissue model (10% gelatin of 1 mm thickness). Finally, the ventricle wall of a rabbit cadaver was dissected using the LILJ. Jet pressure increased in accordance with laser energy from 0.1 to 2 bar; this translated into a penetration depth of 0.08 to 0.9 mm per shot in the ventricle wall of the rabbit cadaver. The gelatin phantom could be cut into the desired shape without significant thermal effects and in the intended manner, with a good surgical view. Conclusions. The present results show that the pulsed LILJ has the potential to become a safe and reliable dissecting method for endoscopic procedures.

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16

Goel, Harsha, and Pulak M. Pandey. "Experimental Investigations and Statistical Modeling of Ultrasonic Assisted Jet Electrochemical Micro-Drilling Process with Pulsed DC." Journal of Advanced Manufacturing Systems 18, no. 03 (September 2019): 413–34. http://dx.doi.org/10.1142/s0219686719500227.

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This article presents an experimental study of a recently developed process, namely, ultrasonic assisted jet electrochemical micro-drilling (UAJet-ECMD) using pulsed DC voltage power supply. The goal of the work was to examine the effect of pulsed DC voltage on the performance of UAJet-ECMD process. In the previous work carried out by the authors, the process has been studied using the continuous DC voltage. The pulse “on” time (pulsed DC voltage), electrolyte pressure and pulse “on” time (ultrasonic vibrations) were selected as the process parameters, whereas material removal rate (MRR) and hole taper were chosen as process responses. It was found that the pulse “on” time (pulsed DC voltage) had crucial effect on the MRR as well as on the hole taper. MRR and hole taper were both found to increase with rise in pulse “on” time (pulsed DC voltage). Optimization of process responses of UAJet-ECMD process was done. The responses obtained for optimized set of process parameters were verified and found in good conformity with the experimental results.

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17

Kholodnaya, Galina, Roman Sazonov, Denis Ponomarev, and Artyem Poloskov. "Pulsed Electron Beam Propagation in Oxygen." Key Engineering Materials 712 (September 2016): 31–36. http://dx.doi.org/10.4028/www.scientific.net/kem.712.31.

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The paper presents the results of the experimental investigation of the pulsed electron beam propagation propagated in a drift tube filled with oxygen. The pressure was 50, 300, and 760 Torr in the drift tube. The experiments were carried out using a TEA-500 pulsed electron accelerator (450 kV accelerating voltage; 10 kA electron beam current; 80±1 ns pulse duration to the base; up to 200 J pulse energy; and 5 cm diameter beam). The electron beam was propagated in the drift tube (40 cm long), 14 cm in diameter composed of two sections equipped with two reverse current shunts. The experiments were carried out which fixed the absorbed dose registered on the walls of the drift chamber.

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18

McGraw, Jeanne M., John D. Perkins, Falah Hasoon, Philip A. Parilla, Chollada Warmsingh, David S. Ginley, Eli Mateeva, and Dennis W. Readey. "Pulsed laser deposition of oriented V2O5 thin films." Journal of Materials Research 15, no. 10 (October 2000): 2249–65. http://dx.doi.org/10.1557/jmr.2000.0323.

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We have found that by varying only the substrate temperature and oxygen pressure five different crystallographic orientations of V2O5 thin films can be grown, ranging from amorphous to highly textured crystalline. Dense, phase-pure V2O5 thin films were grown on SnO2/glass substrates and amorphous quartz substrates by pulsed laser deposition over a wide range of temperatures and oxygen pressures. The films' microstructure, crystallinity, and texturing were characterized by electron microscopy, x-ray diffraction, and Raman spectroscopy. Temperature and oxygen pressure appeared to play more significant roles in the resulting crystallographic texture than did the choice of substrate. A growth map summarizes the results and delineates the temperature and O2 pressure window for growing dense, uniform, phase-pure V2O5 films.

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19

Коробков, С. В., М. Е. Гущин, А. В. Стриковский, К. Н. Лоскутов, and А. А. Евтушенко. "Исследование нестационарного воздушного потока в большой вакуумной камере с помощью стандартного ионизационного манометра." Журнал технической физики 89, no. 1 (2019): 35. http://dx.doi.org/10.21883/jtf.2019.01.46959.117-18.

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AbstractA method for creating a pressure gradient by pulsed injection of air into a large vacuum chamber for laboratory simulation of plasma phenomena in a vertically nonuniform atmosphere is proposed. The dynamics of subsonic and transonic air flows at different background chamber pressures is studied. The feasibility of creating and detecting instantaneous pressure drops by more than two orders of magnitude on a scale of about one meter is shown. Features of the operation of the PMI-10-2 ionization gauge used for pressure measurements in a pulsed gas flow are discussed.

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20

Matsuda, Akitaka, Teruhisa Hongo, Hirofumi Nagao, Yoshitaka Igarashi, Kazutaka G. Nakamura, and Ken-ichi Kondo. "Materials dynamics under nanosecond pulsed pressure loading." Science and Technology of Advanced Materials 5, no. 4 (January 2004): 511–16. http://dx.doi.org/10.1016/j.stam.2004.01.016.

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21

Madanshetty, Sameer I., and Jogesh B. Chandran. "Calibration of high‐intensity pulsed pressure fields." Journal of the Acoustical Society of America 104, no. 3 (September 1998): 1845–46. http://dx.doi.org/10.1121/1.424442.

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22

Akhmadiev, B. A., A. Tatybekov, N. N. Shuyushbayeva, and N. K. Tanasheva. "Propagation of Pulsed Pressure during Electrohydraulic Drilling." Technical Physics 64, no. 4 (April 2019): 455–57. http://dx.doi.org/10.1134/s1063784219040029.

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23

Poiré, E. Corvera, and J. A. del Río. "Viscoelastic fingering with a pulsed pressure signal." Journal of Physics: Condensed Matter 16, no. 22 (May 22, 2004): S2055—S2060. http://dx.doi.org/10.1088/0953-8984/16/22/003.

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24

Orlovskii, V. M. "High-power high-pressure pulsed CO2 lasers." Russian Physics Journal 42, no. 8 (August 1999): 724–27. http://dx.doi.org/10.1007/bf02509348.

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25

Fick, S. E. "Ultrasound power measurement by pulsed radiation pressure." Metrologia 36, no. 4 (August 1999): 351–56. http://dx.doi.org/10.1088/0026-1394/36/4/15.

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26

YAN, Pin, XinPei LU, Tao SHAO, and ChunSheng REN. "Review on atmospheric pressure pulsed DC discharge." SCIENTIA SINICA Physica, Mechanica & Astronomica 41, no. 7 (June 1, 2011): 801–15. http://dx.doi.org/10.1360/132010-1226.

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27

Zerguini-Mimouni, S., A. Boudiba, and M. Azzouz. "PULSED PRESSURE AND RETINOPATHY IN DIABETICS HYPERTENSIVES." Journal of Hypertension 22, Suppl. 2 (June 2004): S296—S297. http://dx.doi.org/10.1097/00004872-200406002-01024.

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28

Clearwater, Deborah, Richard M. Hartshorn, and Susan Krumdieck. "Exploring Multiple Precursors in Pulsed Pressure-MOCVD." ECS Transactions 25, no. 8 (December 17, 2019): 973–77. http://dx.doi.org/10.1149/1.3207694.

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Krumdieck, Susan. "Pulsed-Pressure MOCVD Science, Materials and Technology." ECS Transactions 25, no. 8 (December 17, 2019): 1209–19. http://dx.doi.org/10.1149/1.3207726.

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30

Chebotnyagin, L. M., V. V. Potapov, and V. V. Lopatin. "Patterns of Alloy Deformation by Pulsed Pressure." Russian Physics Journal 58, no. 2 (June 2015): 212–20. http://dx.doi.org/10.1007/s11182-015-0484-y.

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31

Jin, Guofeng, Lichao He, Qingling Wang, Chunyou Liu, Yongguo Jin, Feng Huang, and Meihu Ma. "Pulsed pressure assisted brining of porcine meat." Innovative Food Science & Emerging Technologies 22 (April 2014): 76–80. http://dx.doi.org/10.1016/j.ifset.2013.12.014.

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32

Hart, J., and W. J. Thomas. "Gas separation by pulsed pressure swing adsorption." Gas Separation & Purification 5, no. 2 (June 1991): 125–33. http://dx.doi.org/10.1016/0950-4214(91)80009-t.

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33

Tabaev, Alexander, Galina Kholodnaya, Roman Sazonov, and Denis Ponomarev. "Dissipation of Pulsed Electron Beam in Hydrogen and Oxygen in High Pressure." Key Engineering Materials 685 (February 2016): 653–56. http://dx.doi.org/10.4028/www.scientific.net/kem.685.653.

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This paper presents results of study of dissipation processes of pulsed electron beam in the oxygen and hydrogen (300 Torr). These gases are chosen owing of their use as a operating environment at pulse plasmochemical synthesis of nanosized oxides of metals. Experimental studies are conducted on the laboratory TEU-500 electron accelerator (500 keV electron energy; 10 кА ejected electron current; 60 ns half-amplitude pulse duration; 5 pps pulse repetition rate; diameter of a bunch is 5 cm). The electron beam was removed in a drift pipe through the anode window which is the supporting lattice (with optical transparency of 95%) and through aluminum foil 140 microns thick. The pipe of drift is equipped with three shunts of the return current which are fixing a signal at the same time. The received results of researches allow to make a conclusion. It is necessary to increase length to 80 cm and diameter to 30 cm of a pipe of drift for optimum absorption of a pulse electron beam by operating gas, for obtaining high efficiency of electron accelerator of pulse plasmochemical synthesis of nanosized oxides of silicon and the titan.

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Taha, Samar, Samer Y. Al-Dabag, Sudad S. Ahmed, and Wasan J. Taher. "TiO2- CuI Nanoparticle /Ru Solid State Dye-Sensitize Solar Cells." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 2 (December 16, 2016): 3971–76. http://dx.doi.org/10.24297/jac.v12i2.2154.

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In this work solid state dye sensitized solar cell (SSDSSC) type (ITO / TiO2/ Ru / CuI / Ag) is fabricated. The thin films are prepared by pulse laser deposition (PLD) technique under the vacuum pressure of 3×10−3 mbar and annelid at 450 oC. In this technique Nd:YAG laser at 1064 nm wavelength with (200 , 500 , 800) pulsed was used. It was noticed from (I-V) characteristics of the solar cell that the photocurrent collected from the TiO2 (NP) is increase as the number of laser pulses increase. The conversion efficiency of TiO2 is increased from 2.115% up to 5.654% and for CuI from 1.73 % to 5.19 % when the number of pulses increase from 200 up to 800.

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35

Ge, Tao, Yong Kang Zhang, and Xiao Meng Chu. "Experiment Study on Nd: YAG Pulsed Laser Cutting Carbon Fibers Composites." Key Engineering Materials 464 (January 2011): 510–13. http://dx.doi.org/10.4028/www.scientific.net/kem.464.510.

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Nd:YAG pulsed laser cutting carbon fibers reinforced epoxy resins composites was studied. HAZ and kerf width was made as evaluation index, as well as laser pulse energy, cutting speed, pulse duration and assistant gas pressure was made as controlled parameters. Ideal quality of cutting can be achieved by adjusting those parameters. The effect of each parameter was analyzed.

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Chen, Tao, Songbai Xue, Peng Zhang, Bo Wang, Peizhuo Zhai, and Weimin Long. "Investigation on the Dynamic Behavior of Weld Pool and Weld Microstructure during DP-GMAW for Austenitic Stainless Steel." Metals 10, no. 6 (June 5, 2020): 754. http://dx.doi.org/10.3390/met10060754.

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The influence of heat and droplet transfer into weld pool dynamic behavior and weld metal microstructure in double-pulsed gas metal arc welding (DP-GMAW) was investigated by the self-designed high-speed welding photography system. The heat input, the arc pressure, the droplet momentum and impingement pressure were measured and calculated. It was found that the arc pressure is far less than the droplet impingement pressure. The heat input and droplet impingement pressure per unit time acting on weld pool were proportional to the current pulse frequency, which fluctuated with thermal pulse. The size and oscillation amplitude of the weld pool had noticeable periodic changes synchronized with the process of heat input and droplet impingement. Compared to the microstructure of pulsed gas metal arc welding (P-GMAW) weld metal, that of DP-GMAW weld metal was significantly refined. High oscillation amplitude assisted the enhancement of weld pool convection, which leads to more constitutional supercooling. The heat input and shear force during the peak of thermal pulse causing dendrite fragmentation which provided sufficient crystal nucleus for the growth of equiaxed grains and the possibility of grain refinement. The effects of current parameters on welding behavior and weld metal grain size are investigated for further understanding of DP-GMAW.

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Tabara, Tomohiro, Naoki Wakiya, Takanori Kiguchi, M. Tanaka, and Kazuo Shinozaki. "Fabrication of HfO₂ Thin Film on Si Substrate by Double-Pulse Excitation PLD." Key Engineering Materials 350 (October 2007): 129–32. http://dx.doi.org/10.4028/www.scientific.net/kem.350.129.

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Thin films of HfO2 were fabricated on a p-Si(001) substrate using double pulse excitation (DPE) pulsed laser deposition (PLD) with KrF excimer and Nd:YAG lasers, and using conventional Nd:YAG laser PLD under two typical oxygen pressures (7.3 × 10-2 and 7.3 × 10-1 Pa). At 400°C or higher temperatures, the films are crystalline; at less than 400°C, they are amorphous. At higher oxygen pressures, DPE-PLD was effective against droplets. Then the surface morphology and electrical insulation properties of thin films were improved. At lower pressure, DPE-PLD was ineffective.

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Мамедов, Н. В., С. П. Масленников, Ю. К. Пресняков, А. А. Солодовников, and Д. И. Юрков. "Моды разряда пеннинговского ионного источника при импульсном и стационарном режиме питания." Журнал технической физики 89, no. 9 (2019): 1367. http://dx.doi.org/10.21883/jtf.2019.09.48062.34-19.

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AbstractWe have analyzed the pressure dependences of the discharge and extracted currents for a Penning ion source (PIS) for continuous and pulsed power supplies. We have investigated the effect of voltage amplitude at the PIS anode, pulse repetition rate, and pulse duration on PIS amplitude–time and current–voltage characteristics. The ion source operation regimes and corresponding gas pressure ranges in which different modes of Penning discharge are realized have been determined.

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Zhang, Hua, Jia Wen Xu, Jian She Zhao, and Guo Ran Hua. "Mechanical Effects during Pulsed Laser and Metals Interaction in Neutral Solution." Key Engineering Materials 464 (January 2011): 623–26. http://dx.doi.org/10.4028/www.scientific.net/kem.464.623.

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In order to investigate the mechanical effects during pulsed laser and metal target in neutral solution, a measuring part of stainless cantilever was developed. The vibration of the stainless cantilever was tested and analyzed based on the test mechanism of piezoelectric accelerometer. The impact pressure of the target in NaNO3 solution by pulsed lasers at wavelength of 532nm and 1064nm with millisecond pulse duration were obtained by the test with the measuring part. The results show that mechanical effect during pulsed laser and stainless target interaction in neutral solution is more than three times higher than in air. The pressure of the target with infrared laser is decreased with the distance of laser propagation in neutral solution. However, the effect with green laser is stable in the laser transmission range of 20mm. The green laser is more suitable for processing under neutral solution.

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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 (December 1, 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 roughness, proportional to the pulse energy. However, a large number of successive pulses dramatically increased the surface roughness. The maximum thermal penetration depth of the laser pulse is demonstrated to depend on the fluence and the film structure being either polycrystalline or amorphous. Finally, a comparison between excimer laser annealing and metal-induced crystallization and rapid thermal annealing is presented.

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Yildirim, Elif Cihan, Kyungjae Im, and Derek Elsworth. "The influence of fault reactivation on injection-induced dynamic triggering of permeability evolution." Geophysical Journal International 223, no. 3 (September 15, 2020): 1481–96. http://dx.doi.org/10.1093/gji/ggaa382.

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SUMMARY Mechanisms controlling fracture permeability enhancement during injection-induced and natural dynamic stressing remain unresolved. We explore pressure-driven permeability (k) evolution by step-increasing fluid pressure (p) on near-critically stressed laboratory fractures in shale and schist as representative of faults in sedimentary reservoirs/seals and basement rocks. Fluid is pulsed through the fracture with successively incremented pressure to first examine sub-reactivation permeability response that then progresses through fracture reactivation. Transient pore pressure pulses result in a permeability increase that persists even after the return of spiked pore pressure to the null background level. We show that fracture sealing is systematically reversible with the perturbing pressure pulses and pressure-driven permeability enhancement is eminently reproducible even absent shear slip and in the very short term (order of minutes). These characteristics of the observed fracture sealing following a pressure perturbation appear similar to those of the response by rate-and-state frictional healing upon stress/velocity perturbations. Dynamic permeability increase scales with the pore pressure magnitude and fracture sealing controls the following per-pulse permeability increase, both in the absence and presence of reactivation. However, initiation of the injection-induced reactivation results in a significant increase in the rate of permeability enhancement (dk/dp). These results demonstrate the role of frictional healing and sealing of fractures at interplay with other probable processes in pore pressure-driven permeability stimulation, such as particle mobilization.

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Qi, Bo Jin, Wei Li, Bao Qiang Cong, and Ming Xuan Yang. "The Effect of Hybrid Ultrasonic Pulse Current Parameters on VPTIG Arc Pressure and Weld Formation." Materials Science Forum 704-705 (December 2011): 770–74. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.770.

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Based on a novel arc welding device which can provide hybrid ultrasonic pulse current, the effect of hybrid pulsed current parameters on the arc pressure and weld formation during the aluminum alloy welding process was investigated. The experiment results show that, compared with normal VPTIG process, hybrid ultrasonic pulse VPTIG process gets greater arc pressure. Under the condition of keeping the RMS of positive current unchanged, lowering duty ratio has an evident effect on increasing arc pressure. At proper frequency range, increasing the pulse frequency and decreasing the pulse duty ratio can increase the depth and width of the weld, improve weld penetration rate correspondingly, and be beneficial to improve weld quality.

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Korovin, V. M. "Pressure pulse induced by a pulsed electric current in a cylindrical liquid conductor." Technical Physics 50, no. 7 (July 2005): 815–20. http://dx.doi.org/10.1134/1.1994959.

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Yang, Li Jun, Xiao Liang Cheng, Gen Wang Wang, Qing Ming Xue, Ye Ding, and Yang Wang. "Experimental Evaluation of Cutting Quality of Carbon Fibre Reinforced Polymer with Pulsed Laser." Applied Mechanics and Materials 868 (July 2017): 172–77. http://dx.doi.org/10.4028/www.scientific.net/amm.868.172.

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To investigate the cutting quality of Carbon Fibre Reinforced Polymer (CFRP) with pulsed laser, experiments of high modulus CFRP were carried out using a Nd: YAG pulsed laser with wavelength of 1064nm. Experiments with five factors and five levels were designed to apply the response surface methodologies (RSM). The influence rule of processing parameters consisting scanning speed, pulse frequency, pulse energy, pulse duration and gas pressure on the morphology of machining region including the kerf width, kerf taper and the width of heat affected zone were studied, and the interactions of these input parameters on cutting qualities were also analyzed. Parameters optimization were conducted based on the mathematical model using the optimization software Design Expert. Verification experiments were carried out to prove the adequacy of the optimization results. The infrared laser with pulsed mode was found to be an effective method in processing high modulus CFRP.

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Araki, Tsutomu, Nobuhiro Hanabusa, Teruo Uchida, Xue F. Wang, and Shigeo Minami. "Versatile and High-Repetition Subnanosecond Light Source for Fluorescence Lifetime Measurements." Applied Spectroscopy 46, no. 3 (March 1992): 458–63. http://dx.doi.org/10.1366/0003702924125159.

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We describe the construction and emission characteristics of a gap-adjustable, capacitor-replaceable pulsed light source (air-discharge type) that produces high-repetition pulsed UV light of nanosecond duration. Stable light pulses of 0.8 to 3.5 ns width are generated from atmospheric-pressure air discharge between the sharp anode and round cathode. Appreciable heterogeneities on the distribution of emission intensity and its on-set timing along the discharge gap were observed. Fluorescence lifetimes of ethidium bromide solutions were measured to demonstrate the usefulness of the light source.

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Buzrul, Sencer. "Multi-Pulsed High Hydrostatic Pressure Treatment of Foods." Foods 4, no. 4 (May 25, 2015): 173–83. http://dx.doi.org/10.3390/foods4020173.

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Fick, S. E., and F. R. Breckenridge. "Ultrasonic power output measurement by pulsed radiation pressure." Journal of Research of the National Institute of Standards and Technology 101, no. 5 (September 1996): 659. http://dx.doi.org/10.6028/jres.101.064.

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Ishigami, Toshihiko, Haruo Sugiyama, Kazuhiko Yoshikawa, and Akio Watanabe. "Analysis of the Pulsed High Pressure Sodium Lamp." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 74, no. 10 (1990): 660–67. http://dx.doi.org/10.2150/jieij1980.74.10_660.

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Makarov, G. N. "Pulsed intense molecular beams controlled by pressure shock." Chemical Physics Letters 358, no. 3-4 (May 2002): 307–13. http://dx.doi.org/10.1016/s0009-2614(02)00632-2.

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Onwulata, C. I., and E. Elchediak. "Starches and fibers treated by dynamic pulsed pressure." Food Research International 33, no. 5 (June 2000): 367–74. http://dx.doi.org/10.1016/s0963-9969(00)00057-0.

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