Evaluation and suppression of the light emission instability in case of high-current dc arc excitation in a biological matrix

1986 ◽  
Vol 325 (6) ◽  
pp. 561-562 ◽  
Author(s):  
M. I. Marinov
Keyword(s):  
Light Emission ◽  
High Current ◽  
Biological Matrix ◽  
Dc Arc ◽  
Arc Excitation

Nano-crystalline CVD diamond films deposited on cemented carbide using high current extended DC arc plasma process

Vacuum ◽  
2008 ◽  
Vol 82 (5) ◽  
pp. 543-546 ◽  
Author(s):  
X.M. Meng ◽  
S.J. Askari ◽  
W.Z. Tang ◽  
L.F. Hei ◽  
F.Y. Wang ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Cemented Carbide ◽  
Arc Plasma ◽  
High Current ◽  
Plasma Process ◽  
Nano Crystalline ◽  
Dc Arc

DC arc excitation — is it obsolete?

1986 ◽  
Vol 324 (6) ◽  
pp. 519-524 ◽  
Author(s):  
J. Fijałkowski
Keyword(s):  
Dc Arc ◽  
Arc Excitation

13-kV, 20-A 4H-SiC PiN Diodes for Power System Applications

2014 ◽  
Vol 778-780 ◽  
pp. 855-858 ◽  
Author(s):  
Dai Okamoto ◽  
Yasunori Tanaka ◽  
Tomonori Mizushima ◽  
Mitsuru Yoshikawa ◽  
Hiroyuki Fujisawa ◽  
...  
Keyword(s):  
Power System ◽  
High Voltage ◽  
Light Emission ◽  
Voltage Drop ◽  
High Current ◽  
Forward Voltage ◽  
Pin Diodes ◽  
Current Switching ◽  
Forward Voltage Drop

We successfully fabricated 13-kV, 20-A, 8 mm × 8 mm, drift-free 4H-SiC PiN diodes. The fabricated diodes exhibited breakdown voltages that exceeded 13 kV, a forward voltage drop of 4.9–5.3 V, and an on-resistance (RonAactive) of 12 mW·cm2. The blocking yield at 10 kV on a 3-in wafer exceeded 90%. We investigated failed devices using Candela defect maps and light-emission images and found that a few devices failed because of large defects on the chip. We also demonstrated that the fabricated diodes can be used in conducting high-voltage and high-current switching tests.

The Practical Analysis of High-Purity Chemicals. VI. Emission Spectrographic Analysis of High-Purity Acids

1971 ◽  
Vol 25 (5) ◽  
pp. 542-549 ◽  
Author(s):  
N. A. Kershner ◽  
E. F. Joy ◽  
A. J. Barnard
Keyword(s):  
High Purity ◽  
Internal Standard ◽  
Spectrographic Analysis ◽  
Multielement Standard ◽  
Elapsed Time ◽  
Three Samples ◽  
Mineral Acids ◽  
Dc Arc ◽  
Concurrent Analysis ◽  
Arc Excitation

The spectrographic analysis of volatile acids in a high-purity form is reviewed and a procedure presented that involves evaporation of a 100-g sample under temperature controlled contamination-free conditions and emission spectrography using dc-arc excitation under controlled atmosphere. In the evaporation, graphite (10 mg) is added as a collector, sulfuric acid to convert to less volatile sulfates (with acetic, hydrochloric, and nitric acids), and also mannitol to retain boron (with hydrochloric and hydrofluoric acids). Indium is added as a internal standard. Spectra are examined for 33 elements against a multielement standard in graphite containing indium as an internal standard. For the concurrent analysis of three samples, the elapsed time is 4–10 h and the actual working time 3–5 h. Recovery studies are reported as well as the use of the procedure in the assessment of the leaching of borosilicate glass by concentrated mineral acids.

Development of Turbulence by the Interaction of Gas Flow with Plasmas

1973 ◽  
Vol 28 (8) ◽  
pp. 1281-1289 ◽  
Author(s):  
Lutz Niemeyer ◽  
Klaus Ragaller
Keyword(s):  
Gas Flow ◽  
Light Emission ◽  
Supersonic Nozzle ◽  
Physical Nature ◽  
Point Of View ◽  
Theoretical Point ◽  
High Current ◽  
Axial Pressure ◽  
Plasma Properties ◽  
Axial Pressure Gradient

A high current electric arc in the axis of a supersonic nozzle flow is studied experimentally and theoretically in order to clarify the physical nature of light emission fluctuations which are observed inside the nozzle. The gas flow is produced by discharging a high pressure reservoir of 20 at N2 through a nozzle of 12 mm throat diameter. The arc is fed with a rectangular current pulse of 1.9 kA amplitude and 5 ms duration. The light emission fluctuations of the arc are observed by photographic and photoelectric methods. The results of the observations are compared to theoretical estimates and lead to the conclusion that the fluctuations are caused by hydrodynamic turbulence. This turbulence is shown to be generated by the combined occurrence of a strong axial pressure gradient and a strong radial density gradient in the boundary layer between the arc and the surrounding cold gas flow. The influence of specific plasma properties on the character of the turbulence is briefly discussed from a theoretical point of view.

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