Updating quasi newton matrices with limited storage

The samples were collected from three different locations in the territory, namely Sheda, Abaji and Karimu, and labeled A, B, and C.

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(1999) Investigation on local refractory materials for high temperature applications, Ph D Thesis mech.

Journal of the clay mineral society Volume 51 number 1 8. U.(2004) An investigation into the use of local clays as a high temperature insulator for electric cookers.

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IJERA MENU CALL FOR PAPER PAPER SUBMISSION WHY CHOOSE IJERA AUTHOR INSTRUCTIONS STATISTICS UNIVERSITY AFFILIATES CHECK PAPER STATUS FAQ IJERA CONTENTS CURRENT ISSUE IJERA ARCHIVE SPECIAL ISSUE CALL FOR CONFERENCE UPCOMING CONFERENCE SPECIAL ISSUE ARCHIVE DOWNLOADS MODEL PAPER COPY RIGHT FORM COPYRIGHT INFRINGEMENT JOURNAL ETHICS OPEN ACCESS OPEN ACCESS Abstract: Clay deposits in the Federal Capital Territory of Abuja were investigated with a view to categorizing them in order to determine their suitability as insulating refractory material.

Solid density averaged 3.18g/cm3 with 0% saw dust and 2.91g/cm 3 with 40% saw dust, still bringing them closer to the international range of 2.3-3.5g/cm3 . The simulation is done on various values for percentage of volume fraction recrystallization using both the controllers by MATLAB simulink toolbox. [3] James C ,"Optimization of microstructure development during hot working using control theory,"Metullurgical and Materials Transactions A, Vol 28 A, pp.1921-1930, Sep 1997.

The results showed that the linear shrinkage improved from an average of 8.57% for the three samples for 0% sawdust to an average of 8.32% with 40% addition of saw dust, bringing them closer to the lower range of the international standard of 7-10%. In the other approach PID controller is employed for the plant model (microstructure development). "Application of control theory principles to optimization of grain size during hot extrusion," Materials Science and Technology, Vol 14, pp.25-31, Jan 1998.

Obi V S (1995) Experimental analysis of clay for refractory purpose , B.

This 40% sawdust addition was discovered to be the maximum under which mechanical strength and other refractory properties of clay will remain stable. Agha O A (1998) Testing of local refractory clay for producing furnace lining bricks. Key words: Carbon steel, strain, strain rate, Temperature, PID Controller, LQR.

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