Improvement in the statistical operation of a Blumlein pulse forming line in bipolar pulse mode

2014 ◽  
Vol 85 (7) ◽  
pp. 073303 ◽  
Author(s):  
A. I. Pushkarev ◽  
Y. I. Isakova ◽  
I. P. Khaylov
Keyword(s):  
Pulse Mode ◽  
Bipolar Pulse ◽  
Statistical Operation

Initial plasma of a magnetically insulated ion diode in bipolar-pulse mode

2008 ◽  
Vol 15 (12) ◽  
pp. 123108 ◽  
Author(s):  
J. P. Xin ◽  
X. P. Zhu ◽  
M. K. Lei
Keyword(s):  
Pulse Mode ◽  
Bipolar Pulse ◽  
Initial Plasma

Energy balance in a double forming line operated in the bipolar pulse mode

2015 ◽  
Vol 58 (1) ◽  
pp. 73-80
Author(s):  
A. I. Pushkarev ◽  
Yu. I. Isakova ◽  
X. Zhang ◽  
I. P. Khaylov
Keyword(s):  
Energy Balance ◽  
Pulse Mode ◽  
Bipolar Pulse

Isolated Large Bipolar Pulse (ILBP) Produced by Lightning Discharge in Winter Thunderstorm

2013 ◽  
Vol 133 (9) ◽  
pp. 451-457
Author(s):  
Ting Wu ◽  
Yuji Takayanagi ◽  
Tsuyoshi Funaki ◽  
Satoru Yoshida ◽  
Tomoo Ushio ◽  
...  
Keyword(s):  
Lightning Discharge ◽  
Bipolar Pulse

Dynamic Changes of Collagen Ⅳ During Cancer Invasion and Migration: Pulse Mode

2013 ◽  
Vol 40 (10) ◽  
pp. 1056
Author(s):  
Min FANG ◽  
Jing-Ping YUAN ◽  
Chun-Wei PENG ◽  
Shao-Ping LIU ◽  
Yan LI
Keyword(s):  
Cancer Invasion ◽  
Pulse Mode ◽  
Dynamic Changes ◽  
Invasion And Migration ◽  
And Migration

Depolarization field in relaxor-based ferroelectric single crystals under one-cycle bipolar pulse drive

2019 ◽  
Vol 28 (12) ◽  
pp. 127702
Author(s):  
Chuan-Wen Chen ◽  
Yang Xiang ◽  
Li-Guo Tang ◽  
Lian Cui ◽  
Bao-Qing Lin ◽  
...  
Keyword(s):  
Single Crystals ◽  
Bipolar Pulse

scholarly journals Experimental studies on the possibility of using a pulsed laser for spot welding of thin metallic foils

2020 ◽  
Vol 10 (1) ◽  
pp. 674-680
Author(s):  
Piotr Sęk
Keyword(s):  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulse Mode ◽  
Weld Strength ◽  
Spot Welds ◽  
Butt Welding ◽  
Strength Tests ◽  
Metallic Foils ◽  
The Impact

AbstractThe purpose of the experiment was to study the influence of the laser beam in pulse mode on metallic foils in order to obtain a spot weld. The welding process was carried out using the overlap weld method, using spot welds in various quantities. The Nd - YAG BLS 720 pulsed laser was used to conduct the experiment. The impact of the number of spot welds on the value of force needed to break the sample was examined. A number of measurements were carried out to determine the best process parameters. Butt welding and overlap welding were also performed using a continuous weld consisting of spot welds. Weld strength tests were performed to select the most appropriate parameters for the process under consideration.

scholarly journals Influence of Duty Ratio and Current Mode on Robot 316L Stainless Steel Arc Additive Manufacturing

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 508
Author(s):  
Ping Yao ◽  
Hongyan Lin ◽  
Wei Wu ◽  
Heqing Tang
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Heat Input ◽  
Low Frequency ◽  
Single Pulse ◽  
Pulse Mode ◽  
Double Pulse ◽  
Duty Ratio ◽  
Utilization Rate ◽  
Specimen Height

Wire and arc additive manufacturing (WAAM) is usually for fabricating components due to its low equipment cost, high material utilization rate and cladding efficiency. However, its applications are limited by the large heat input decided by process parameters. Here, four 50-layer stainless steel parts with double-pulse and single-pulse metal inert gas (MIG) welding modes were deposited, and the effect of different duty ratios and current modes on morphology, microstructure, and performance was analyzed. The results demonstrate that the low frequency of the double-pulse had the effect of stirring the molten pool; therefore, the double-pulse mode parts presented a bigger width and smaller height, finer microstructure and better properties than the single-pulse mode. Furthermore, increasing the duty ratio from 35% to 65% enlarged the heat input, which then decreased the specimen height, increased the width, and decreased the hardness and the tensile strength.

scholarly journals Mind the gap – Part 1: Accurately locating warm marine boundary layer clouds and precipitation using spaceborne radars

2020 ◽  
Vol 13 (5) ◽  
pp. 2363-2379 ◽  
Author(s):  
Katia Lamer ◽  
Pavlos Kollias ◽  
Alessandro Battaglia ◽  
Simon Preval
Keyword(s):  
Boundary Layer ◽  
Cloud Cover ◽  
Marine Boundary Layer ◽  
Short Pulse ◽  
Pulse Mode ◽  
Cloud Base ◽  
Boundary Layer Clouds ◽  
Highly Sensitive ◽  
Eastern North Atlantic ◽  
Long Pulse

Abstract. Ground-based radar observations show that, over the eastern North Atlantic, 50 % of warm marine boundary layer (WMBL) hydrometeors occur below 1.2 km and have reflectivities of < −17 dBZ, thus making their detection from space susceptible to the extent of surface clutter and radar sensitivity. Surface clutter limits the ability of the CloudSat cloud profiling radar (CPR) to observe the true cloud base in ∼52 % of the cloudy columns it detects and true virga base in ∼80 %, meaning the CloudSat CPR often provides an incomplete view of even the clouds it does detect. Using forward simulations, we determine that a 250 m resolution radar would most accurately capture the boundaries of WMBL clouds and precipitation; that being said, because of sensitivity limitations, such a radar would suffer from cloud cover biases similar to those of the CloudSat CPR. Observations and forward simulations indicate that the CloudSat CPR fails to detect 29 %–43 % of the cloudy columns detected by ground-based sensors. Out of all configurations tested, the 7 dB more sensitive EarthCARE CPR performs best (only missing 9.0 % of cloudy columns) indicating that improving radar sensitivity is more important than decreasing the vertical extent of surface clutter for measuring cloud cover. However, because 50 % of WMBL systems are thinner than 400 m, they tend to be artificially stretched by long sensitive radar pulses, hence the EarthCARE CPR overestimation of cloud top height and hydrometeor fraction. Thus, it is recommended that the next generation of space-borne radars targeting WMBL science should operate interlaced pulse modes including both a highly sensitive long-pulse mode and a less sensitive but clutter-limiting short-pulse mode.

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