Analysis of PBG filter structures using FDTD with least square fitting method

2005 ◽  
Author(s):  
Yu Zhang ◽  
Bin Li ◽  
Changhong Liang
Keyword(s):  
Least Square ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Filter Structures ◽  
Least Square Fitting Method

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.

Study on Choice of Reference Planes for 3D Machined Surface Roughness of SiCp/Al Composites during High Speed Milling Process

2010 ◽  
Vol 150-151 ◽  
pp. 129-132 ◽  
Author(s):  
Yang Jun Wang ◽  
Ming Zhou ◽  
Yuan Jing Zhang
Keyword(s):  
High Speed ◽  
Laser Scanning ◽  
Chemical Vapour ◽  
Least Square ◽  
Confocal Laser ◽  
Machined Surface ◽  
High Speed Milling ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Least Square Fitting Method

This paper presents an experimental study in high speed milling of SiCp/Al composites. Machining tests were carried out on a high speed milling machine by using chemical vapour deposition (CVD) diamond coated tools. The surface micro-topography was tested by the OLS3000 Confocal Laser Scanning Microscope. The Gaussian filtering method and the least square fitting method were used to treat the measured results. Two methods are compared according to the effect on keeping important original surface’s character. The results showed that the least square fitting method is suitable due to its good accordance to the original surface’s character.

scholarly journals Revisiting to the Geiger–Nuttal Relation to be Employed in the Estimation of the Half-Lives of Superheavy Nuclei

2020 ◽  
Vol 65 (2) ◽  
pp. 120
Author(s):  
F. M. A. Al-Jomaily ◽  
M. I. Khalil
Keyword(s):  
Angular Momentum ◽  
Analytical Formula ◽  
Alpha Decay ◽  
Least Square ◽  
Superheavy Nuclei ◽  
Neutron Excess ◽  
Least Square Fitting ◽  
Fitting Method ◽  
Least Square Fitting Method ◽  
Acceptable Agreement

The half-lives for the even–even (e–e), even–odd (e–o), odd–even (o–e) and odd–odd (o–o) nuclei in the range 100 < Z < 120 have been tested within the Viola–Seaborg formula (VSF) and within the analytical formula of Royer (RF). We proposed another formula (Present Work Formula or PWF) with regard for the effect of angular momentum of the alpha decay particle and with the use of the relative neutron excess (︀(N−Z)/A)︀. Our formula includes a new set of parameters found by the least square fitting method of alpha decays of 128 nuclei. We obtained the standard deviations for each of the formulas for comparison. The results show an acceptable agreement with available data. The values of the suggested theoretical coefficient (K) for the PWF show a similar behavior of half-lives with a-decay, which can be used to predict the new superheavy nuclei.

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