scholarly journals Semi Empirical Equation for the Calculation of the Track Diameter of Alpha Particles in CR-39 as a Function of Etching Temperature

2014 ◽  
Vol 25 (1) ◽  
pp. 120-126 ◽  
Author(s):  
Mushtaq A. Al-Jubbori
Keyword(s):  
Empirical Equation ◽  
Alpha Particles ◽  
Semi Empirical ◽  
Track Diameter

A new semi-empirical equation for compressed liquid densities ofn-alkanes

2012 ◽  
Vol 8 (3) ◽  
pp. 425-432
Author(s):  
Yanjun Sun ◽  
Xiaopo Wang ◽  
Zhigang Liu
Keyword(s):  
Empirical Equation ◽  
Compressed Liquid ◽  
Semi Empirical

Liquid Taylor Bubbles Rising in a Vertical Column of a Heavier Liquid: An Approximate Analysis

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
T. K. Mandal ◽  
G. Das ◽  
P. K. Das
Keyword(s):  
Empirical Equation ◽  
Flow Analysis ◽  
Rise Velocity ◽  
Vertical Column ◽  
Taylor Bubble ◽  
Two Fluids ◽  
Viscosity Effects ◽  
Semi Empirical ◽  
Theoretical Analyses ◽  
Taylor Bubbles

It has been noted that a volume of lighter liquid when injected into a stationary column of a heavier liquid, it rises up as a simple elongated Taylor bubble. In the present study, experimental and theoretical analyses have been performed to understand the rise of liquid Taylor bubbles. The experiments have been performed with different liquid pairs with their viscosities ranging from 0.71mPas to 1.75mPas and conduit sizes ranging from 0.012 m to 0.0461 m. The bubble shape has been predicted using a potential flow analysis and validated from photographic measurements. This analysis has been further modified to predict the rise velocity. The modified analysis accounts for the density difference between the two liquids, viscosity effects of the primary liquid, and interfacial tension of two fluids. A semi-empirical equation has been developed, which gives satisfactory results for most of the cases.

scholarly journals Overpotential evaluation of PEMFC using semi-empirical equation and SEM

2018 ◽  
Vol 67 ◽  
pp. 01015 ◽  
Author(s):  
Yutaro Akimoto ◽  
Shin-nosuke Suzuki
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Fault Diagnosis ◽  
Wind Power ◽  
Power Supply ◽  
Empirical Equation ◽  
Independent Power Supply ◽  
Diagnosis Method ◽  
Degradation Diagnosis ◽  
Semi Empirical

Fuel cells are a clean and weather-independent power supply. Solar and wind power are widespread in islands that are difficult to supply power. If problems are solved in the future, fuel cells are also expected to become popular. The widespread commercialization of PEMFC stacks depends on their reliability and fault diagnosis. In this study, we developed a degradation diagnosis method for the purpose of improving reliability. The output reduction of the fuel cell is separated into reduction factors called overpotentials. And the factor of the decrease is specified. In this paper, we show the proposed method and the degradation factors, and the effectiveness of the method.

The Inertial Effect in Rotational Fluorescence Depolarization

1992 ◽  
Vol 47 (9) ◽  
pp. 971-973 ◽  
Author(s):  
A. Kawski ◽  
P. Bojarski ◽  
A. Kubicki
Keyword(s):  
Empirical Equation ◽  
Molecular Geometry ◽  
Moment Of Inertia ◽  
Experimental Results ◽  
Inertial Effect ◽  
Fluorescence Depolarization ◽  
Moments Of Inertia ◽  
Low Viscosity ◽  
The Moment ◽  
Semi Empirical

Abstract The influence of the moment of inertia on the rotational fluorescence depolarization is discussed. Based on experimental results obtained for five luminescent compounds: 2,5-diphenyloxazole (PPO), 2,2'-p-phenylene-bis(5-phenyloxazole) (POPOP), p-bis[2-(5-α-naphthyloxazolyl)]-benzene (α-NOPON), 4-dimethylamino-ω-methylsulphonyl-trans-styrene (3a) in n-parafines at low viscosity (from 0.22 x 10-3 Pa • s to 0.993 x 10-3 Pa • s) and diphenylenestilbene (DPS) in different solvents, a semi-empirical equation is proposed, yielding moments of inertia that are only two to five times higher than those estimated from the molecular geometry

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