scholarly journals Dependence of inter-electrode gap separation on the Positive and Negative Pin-Grid Plasma Corona Discharge

2020 ◽  
Vol 9 (3) ◽  
pp. 27
Author(s):  
Pirzheen O. Abdullah ◽  
Sabah I. Waisy
Keyword(s):  
Corona Discharge ◽  
Least Square ◽  
Electrode Gap ◽  
Least Square Fitting ◽  
General Law ◽  
Fitting Method ◽  
Current Voltage ◽  
Negative Corona Discharge ◽  
Plasma Corona ◽  
Straight Lines

In this work, both positive and negative corona discharge of pin-grid geometrical configuration was studied and the necessary modification of the general law of corona discharge was proposed. The current-voltage measurements were performed at room temperature and at different inter electrode separations. The variation of dimensional constant K and corona inception voltage Vo with pin-grid separations S were subjected into the general law of corona discharge using the least square fitting method in Log-Log scale. The relationship between corona current and different voltage (V-Vo) was investigated to find the acceptable value of exponent n. The least square fitting for all variations of corona parameters was based on the highest R-square value of obtained straight lines for individual measurements. It was found that value of exponent n for both polarities is larger compared to the empirical formula proposed previously for the general law of corona discharge.

scholarly journals COMPARING TWO DIFFERENT MODES OF MECHANICAL VENTILATION BY THE LEAST SQUARE FITTING METHOD: NAVA VERSUS PSV

2015 ◽  
Vol 3 (Suppl 1) ◽  
pp. A319
Author(s):  
S Spadaro ◽  
S Grasso ◽  
V Cricca ◽  
F Dalla Corte ◽  
R Di Mussi ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Least Square ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Least Square Fitting Method

A New Technique for Camera Calibration Using Circle Template

2011 ◽  
Vol 467-469 ◽  
pp. 1917-1920
Author(s):  
Ya Wei Liu ◽  
Jian Wei Li
Keyword(s):  
Camera Calibration ◽  
Least Square ◽  
Calibration Technique ◽  
Least Square Fitting ◽  
Spatial Moment ◽  
Fitting Method ◽  
Moment Operator ◽  
A New Technique ◽  
Perspective Model ◽  
Least Square Fitting Method

In view of the poor anti-noise performance of traditional methods, the principle of camera calibration is analyzed based on calibration template with planar circles, and a new calibration technique is proposed based on pin-hole perspective model. Firstly, the edges of image ellipses are located in sub-pixel by spatial-moment operator. Then elliptic equations are obtained by the Least Square Fitting method, and common tangents of two arbitrary ellipses are also calculated. Finally, the extrinsic and intrinsic parameters are computed by the Radial Alignment Constraint (RAC) model. Experiments results indicate that proposed method has a goof performance of lower computation complexity and higher precision.

Reliability and Usefulness of the Fitting of a Modified Gamma Function to Time-Activity Curves by Means of a Non-Linear Iterative Least-Square Method

1981 ◽  
Vol 20 (04) ◽  
pp. 195-197
Author(s):  
J. M. Fránquiz
Keyword(s):  
Gamma Function ◽  
Least Square Method ◽  
Least Square ◽  
Base Line ◽  
Time Activity ◽  
Appearance Time ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Non Linear ◽  
Least Square Fitting Method

A non-linear iterative least-square fitting method is presented for calculating the parameters of a modified gamma function. The method permits the correction of the appearance time (AT) and the curve parameters in those situations in which AT cannot be estimated with accuracy. The reliability and accuracy of the method is studied in experimental and simulated curves by means of a computer, comparing the results with those obtained by the method of Starmer and Clark for different initial selections of AT and noise at the base line. The usefulness of the method is shown in situations where the curves are distorted in their initial part.

DEVELOPMENT OF A LASER MEASUREMENT SYSTEM FOR FLATNESS AND THICKNESS OF THE RUBBER AND RACKET

2013 ◽  
Vol 37 (3) ◽  
pp. 539-547
Author(s):  
Yu-Fen Chen ◽  
Chien-Hung Liu ◽  
Te-Hua Fang ◽  
Chen-Chih Huang ◽  
Chi-Fan Liu
Keyword(s):  
Standard Deviation ◽  
Measurement System ◽  
Least Square ◽  
Experimental Results ◽  
Thickness Gauge ◽  
Laser Measurement ◽  
Laser Measurement System ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Least Square Fitting Method

This study analyzes the flatness of the commercial rackets measured by the modified S500 rubber thickness gauge mounted on a moving stage. A least square fitting method was used to calculate the racket flatness of these rackets. The experimental results showed the average flatness of all samples is 0.03 mm and the triple standard deviation is ±0.03 mm. The flatness of the rackets will lead to an in accurate examination of the rubber thickness before a match.

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