Statistical approach of synthesize CoFe2O4 nanoparticles to optimize their characteristics using response surface methodology

2017 ◽  
Vol 432 ◽  
pp. 362-372 ◽  
Author(s):  
S. Fatemeh Shams ◽  
Mehrdad Kashefi ◽  
Carolin Schmitz-Antoniak
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Statistical Approach ◽  
Cofe2o4 Nanoparticles

Rietveld structure refinement to optimize the correlation between cation disordering and magnetic features of CoFe2O4 nanoparticles

2018 ◽  
Vol 42 (4) ◽  
pp. 3050-3062 ◽  
Author(s):  
S. Fatemeh Shams ◽  
Mehrdad Kashefi ◽  
Carolin Schmitz-Antoniak
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Structure Refinement ◽  
Cofe2o4 Nanoparticles ◽  
Synthesis Parameters ◽  
Magnetic Features ◽  
Cation Disordering

The effects of synthesis parameters on the structural and magnetic features of CoFe2O4 nanoparticles have been investigated and their mutual correlations optimized by using response surface methodology.

Laboratory Investigation of Bit Bearing Temperatures in Rotary Drilling

1986 ◽  
Vol 108 (3) ◽  
pp. 221-227 ◽  
Author(s):  
M. G. Karfakis ◽  
R. W. Heins
Keyword(s):  
Wear Resistance ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Laboratory Investigation ◽  
High Temperatures ◽  
Statistical Approach ◽  
Bearing Material ◽  
Rotary Drilling ◽  
Test Conditions ◽  
Geothermal Drilling

One mechanism of bit failure in geothermal drilling is thought to be directly related to the overheating of the bearings. High temperatures alter the microstructure of the bearing material and reduce its wear resistance. This paper presents a laboratory study on bit bearing temperatures in rotary drilling using a two-roller cone micro-bit drill rig and a statistical approach referred as response surface methodology. The effects of the drilling variables on bearing temperatures were investigated. The range of bearing temperatures for the test conditions under study was determined. A second-order bearing temperature predicting equation is presented.

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