scholarly journals A Simulation of the Effects of Varying Repetition Rate and Pulse Width of Nanosecond Discharges on Premixed Lean Methane-Air Combustion

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Moon Soo Bak ◽  
Mark A. Cappelli
Keyword(s):  
Repetition Rate ◽  
Pulse Width ◽  
Electronic States ◽  
Total Power ◽  
Critical Element ◽  
Kinetic Simulation ◽  
Two Dimensional ◽  
Pulsed Discharges

Two-dimensional kinetic simulation has been carried out to investigate the effects of repetition rate and pulse width of nanosecond repetitively pulsed discharges on stabilizing premixed lean methane-air combustion. The repetition rate and pulse width are varied from 10 kHz to 50 kHz and from 9 ns to 2 ns while the total power is kept constant. The lower repetition rates provide larger amounts of radicals such as O, H, and OH. However, the effect on stabilization is found to be the same for all of the tested repetition rates. The shorter pulse width is found to favor the production of species in higher electronic states, but the varying effects on stabilization are also found to be small. Our results indicate that the total deposited power is the critical element that determines the extent of stabilization over this range of discharge properties studied.

Ranging Technique Based on Conically Scanned Single Pixel Millimeter Wave Radiometer

2014 ◽  
Vol 12 ◽  
pp. 43-52 ◽  
Author(s):  
Xuan Lu ◽  
Li Wu ◽  
Ze Long Xiao ◽  
Jian Zhong Xu
Keyword(s):  
Millimeter Wave ◽  
Pulse Width ◽  
Solid Angle ◽  
Total Power ◽  
Two Dimensional ◽  
Threshold Method ◽  
One Dimensional ◽  
Concealed Weapon Detection ◽  
Millimeter Wave Radiometer ◽  
Single Pixel

Passive millimeter wave detection offers great advantages of covertness and anti-interference in surveillance and concealed weapon detection but suffers from disabilities of distance measurement. Based on the conically scanned single pixel millimeter wave radiometer, this paper presents a ranging method via dual-measurement utilizing the relation between the solid angle of the object and its distance from antenna. Both one-dimensional and two-dimensional detections are considered. For one-dimensional detection, the relation between the solid angle of the object and the range is reflected by the pulse width of the radiometer output, and the pulse widths of the radiometer output in two measurements could be extracted by derivative or threshold method. Then the range is calculated since it is inversely proportional to the pulse width, which is demonstrated in simulation. For two-dimensional imaging, a scale extracting algorithm is developed to search the scale between the object sizes of bi-measured images. Experiments are performed using a 94.5GHz total-power radiometer mounted on conically scanning platform. The obtained radiometric images are processed by the developed algorithm and the results indicated that both the scale extracting algorithm and the ranging method are effective and practical.

scholarly journals Modular Marx Generator Based on SiC-MOSFET Generating Adjustable Rectangular Pulses

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3492
Author(s):  
Yahia Achour ◽  
Jacek Starzyński ◽  
Jacek Rąbkowski
Keyword(s):  
Silicon Carbide ◽  
Repetition Rate ◽  
Pulse Width ◽  
Biomedical Applications ◽  
Living Cells ◽  
Marx Generator ◽  
Electrical Field ◽  
Rectangular Shape ◽  
Overall Performance ◽  
Pulsed Electrical Field

The paper introduces a new design of Marx generator based on modular stages using Silicon Carbide MOSFETs (SiC-MOSFET) aimed to be used in biomedical applications. In this process, living cells are treated with intense nanosecond Pulsed Electrical Field (nsPEF). The electric field dose should be controlled by adjusting the pulse parameters such as amplitude, repetition rate and pulse-width. For this purpose, the structure of the proposed generator enables negative pulses with a quasi-rectangular shape, controllable amplitude, pulse-width and repetition-rate. A complete simulation study was conducted in ANSYS-Simplorer to verify the overall performance. A compact, modular prototype of Marx generator was designed with 1.7 kV rated SiC-MOSFETs and, finally, a set of experiments confirmed all expected features.

CESIUM-INDUCED QUANTIZED 2D ELECTRON CHANNEL ON THE InAs(110) SURFACE

1995 ◽  
Vol 02 (06) ◽  
pp. 723-729 ◽  
Author(s):  
V. YU. ARISTOV ◽  
G. LE LAY ◽  
M. GREHK ◽  
V.M. ZHILIN ◽  
A. TALEB-IBRAHIMI ◽  
...  
Keyword(s):  
Electron Emission ◽  
Electronic States ◽  
Photoemission Spectroscopy ◽  
Spectral Features ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Discrete Energy ◽  
Electron Channel ◽  
Self Consistent ◽  
Electron Photoemission

We present the first clear evidence of electron emission arising directly from a quantized two-dimensional electron channel from the InAs (110) surface covered by a few Cs atoms (≈ 0.01 Cs ML). Spectral features observed by photoemission spectroscopy using synchrotron radiation reveal discrete-energy electronic states resulting from quantization in the direction normal to the surface. The electron photoemission originates from the vicinities of [Formula: see text] points in the first and second surface Brillouin zones corresponding to the bottom of the conduction band. These findings are in agreement with self-consistent theoretical energy-level calculations using a jellium-like model.

scholarly journals One-dimensional versus two-dimensional electronic states in vicinal surfaces

2005 ◽  
Vol 7 ◽  
pp. 101-101 ◽  
Author(s):  
J E Ortega ◽  
M Ruiz-Osés ◽  
J Cordón ◽  
A Mugarza ◽  
J Kuntze ◽  
...  
Keyword(s):  
Electronic States ◽  
Two Dimensional ◽  
Vicinal Surfaces ◽  
One Dimensional

scholarly journals Origin of two-dimensional electronic states at Si- and Gd-terminated surfaces of GdRh2Si2 (001)

2019 ◽  
Vol 100 (7) ◽  
Author(s):  
A. Yu. Vyazovskaya ◽  
M. M. Otrokov ◽  
Yu. M. Koroteev ◽  
K. Kummer ◽  
M. Güttler ◽  
...  
Keyword(s):  
Electronic States ◽  
Two Dimensional
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