Uniformity of Electrical Current for Underwater Electrical Wire Array Explosion

2021 ◽  
Author(s):  
Zhigang Liu ◽  
Dun Qian ◽  
Xiaobing Zou ◽  
Xinxin Wang
Keyword(s):  
Wire Array ◽  
Electrical Current ◽  
Electrical Wire

Enhancement of Shock Wave Generated by Underwater Electrical Wire-Array Explosion at a Fixed Energy and Mass of Wire-Array

2020 ◽  
Vol 48 (10) ◽  
pp. 3373-3377 ◽  
Author(s):  
Dun Qian ◽  
Zhigang Liu ◽  
Liuxia Li ◽  
Xiaobing Zou ◽  
Xinxin Wang
Keyword(s):  
Shock Wave ◽  
Wire Array ◽  
Electrical Wire ◽  
Fixed Energy

Effect of reflection patterns on converging shock waves generated by underwater electrical wire array explosion

2020 ◽  
Vol 27 (10) ◽  
pp. 103503
Author(s):  
Zhigang Liu ◽  
Dun Qian ◽  
Xiaobing Zou ◽  
Xinxin Wang
Keyword(s):  
Shock Waves ◽  
Wire Array ◽  
Electrical Wire ◽  
Converging Shock Waves

scholarly journals Experimental Study on the Thermoplastic Dripping and Flame Spread Behaviors of Energized Electrical Wire under Reduced Atmospheric Pressure

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 346
Author(s):  
Hao He ◽  
Qixing Zhang ◽  
Long Shi ◽  
Haihang Li ◽  
Dongmei Huang ◽  
...  
Keyword(s):  
Flame Spread ◽  
Fire Risk ◽  
Electrical Current ◽  
Wire Surface ◽  
Short Term ◽  
Reduced Pressure ◽  
Electrical Currents ◽  
Electrical Wire ◽  
Short Period ◽  
Increasing Trends

Flame spread over wire surface is different from other solid fires as it is usually accompanied by melting and dripping processes. Although the related behaviors at reduced pressure (20–100 kPa) are significant to those fire risk evaluations, very few studies have been undertaken on this matter. Therefore, the thermoplastic dripping and flame spread behaviors of energized polyethylene insulated copper wires were investigated experimentally at reduced pressure. It was known from experimental results that the dripping frequency increases, showing a relatively smooth (linear) and rapid (power) increasing trends under high and low electrical currents, respectively. A short-period flame disappearance was observed during the dripping process, which is unique for the energized wire at reduced pressure. The bright flame can disappear for several seconds and then show again after the dripping. While at 20 kPa or lower, the wire flame would turn to a completed extinguishment after the dripping. A critical dripping point was proposed to show the minimal required electrical current to sustain the flame spearing. The critical current changes smoothly during 100–80 kPa and decreases rapidly at 80–60 kPa. Additionally, the dripping phenomenon can stop or delay the flame spread, partly because of the short-term flame disappearance.

Characterization of converging shock waves generated by underwater electrical wire array explosion

2008 ◽  
Vol 15 (11) ◽  
pp. 112703 ◽  
Author(s):  
S. Efimov ◽  
A. Fedotov ◽  
S. Gleizer ◽  
V. Tz. Gurovich ◽  
G. Bazalitski ◽  
...  
Keyword(s):  
Shock Waves ◽  
Wire Array ◽  
Electrical Wire ◽  
Converging Shock Waves

scholarly journals Comparison of electrical wire explosion characteristics of single wire and wire array in air

2020 ◽  
Vol 69 (7) ◽  
pp. 075203
Author(s):  
Chen Li ◽  
Ruo-Yu Han ◽  
Yi Liu ◽  
Chen-Yang Zhang ◽  
Ji-Ting Ouyang ◽  
...  
Keyword(s):  
Wire Array ◽  
Single Wire ◽  
Wire Explosion ◽  
Electrical Wire ◽  
Electrical Wire Explosion

The Role of Computer Modeling in Electrocardiography

1990 ◽  
Vol 29 (04) ◽  
pp. 282-288 ◽  
Author(s):  
A. van Oosterom
Keyword(s):  
Electrical Activity ◽  
Computer Modeling ◽  
Body Surface ◽  
Electrical Current ◽  
The Body ◽  
Volume Conductor ◽  
Current Generator ◽  
Cardiac Electrical Activity ◽  
Source Models

AbstractThis paper introduces some levels at which the computer has been incorporated in the research into the basis of electrocardiography. The emphasis lies on the modeling of the heart as an electrical current generator and of the properties of the body as a volume conductor, both playing a major role in the shaping of the electrocardiographic waveforms recorded at the body surface. It is claimed that the Forward-Problem of electrocardiography is no longer a problem. Several source models of cardiac electrical activity are considered, one of which can be directly interpreted in terms of the underlying electrophysiology (the depolarization sequence of the ventricles). The importance of using tailored rather than textbook geometry in inverse procedures is stressed.

Integration of Multi-geophysical Approaches to Identify Potential Pathways of Heavy Metals Contamination - A Case Study in Zeida, Morocco

2020 ◽  
Vol 25 (3) ◽  
pp. 415-423
Author(s):  
Ahmed Lachhab ◽  
El Mehdi Benyassine ◽  
Mohamed Rouai ◽  
Abdelilah Dekayir ◽  
Jean C. Parisot ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Seismic Velocity ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Low Frequency ◽  
Electrical Current ◽  
P Wave ◽  
Low Resistivity ◽  
Refraction Tomography ◽  
Geophysical Surveys

The tailings of Zeida's abandoned mine are found near the city of Midelt, in the middle of the high Moulouya watershed between the Middle and the High Atlas of Morocco. The tailings occupy an area of about 100 ha and are stored either in large mining pit lakes with clay-marl substratum or directly on a heavily fractured granite bedrock. The high contents of lead and arsenic in these tailings have transformed them into sources of pollution that disperse by wind, runoff, and seepage to the aquifer through faults and fractures. In this work, the main goal is to identify the pathways of contaminated water with heavy metals and arsenic to the local aquifers, water ponds, and Moulouya River. For this reason, geophysical surveys including electrical resistivity tomography (ERT), seismic refraction tomography (SRT) and very low-frequency electromagnetic (VLF-EM) methods were carried out over the tailings, and directly on the substratum outside the tailings. The result obtained from combining these methods has shown that pollutants were funneled through fractures, faults, and subsurface paleochannels and contaminated the hydrological system connecting groundwater, ponds, and the river. The ERT profiles have successfully shown the location of fractures, some of which extend throughout the upper formation to depths reaching the granite. The ERT was not successful in identifying fractures directly beneath the tailings due to their low resistivity which inhibits electrical current from propagating deeper. The seismic refraction surveys have provided valuable details on the local geology, and clearly identified the thickness of the tailings and explicitly marked the boundary between the Triassic formation and the granite. It also aided in the identification of paleochannels. The tailings materials were easily identified by both their low resistivity and low P-wave velocity values. Also, both resistivity and seismic velocity values rapidly increased beneath the tailings due to the compaction of the material and lack of moisture and have proven to be effective in identifying the upper limit of the granite. Faults were found to lie along the bottom of paleochannels, which suggest that the locations of these channels were caused by these same faults. The VLF-EM surveys have shown tilt angle anomalies over fractured areas which were also evinced by low resistivity area in ERT profiles. Finally, this study showed that the three geophysical methods were complementary and in good agreement in revealing the pathways of contamination from the tailings to the local aquifer, nearby ponds and Moulouya River.

Last Progress in Underwater Electrical Wire Explosion

2008 ◽  
Vol 128 (1) ◽  
pp. 31-36
Author(s):  
Alon Grinenko ◽  
Arkady Sayapin ◽  
Sergey Efimov ◽  
Alexander Fedotov ◽  
Yakov E. Krasik
Keyword(s):  
Wire Explosion ◽  
Electrical Wire ◽  
Electrical Wire Explosion
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