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\hypersetup{pdftitle={Some Engineering Properties of Jatropha Seeds (``Lapalapa'') as a Function of Moisture Content},pdfauthor={Ayo Olalusi, Olusola Bolaji, John Isa},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Bio-yield point, Bio-yield stress, jatropha, Mechanical properties, Physical properties},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\Large{\textbf{Some Engineering Properties of Jatropha Seeds (``Lapalapa'') as a Function of Moisture Content\footnote{\textbf{Contact Address:} Ayo Olalusi, Federal University of Technology, Akure, Nigeria, Department of Agricultural Engineering, Akure, Nigeria, \mbox{e-mail}: \email{ayoolalusi@yahoo.co.uk}}\\[0.8ex]}}
\normalsize{\textsc{Ayo Olalusi$^{1}$, Olusola Bolaji$^{2}$, John Isa$^{3}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$Federal University of Technology, Akure, Nigeria, Department of Agricultural Engineering, Nigeria}}}
\item[]{\small{\textit{$^{2}$Lagos State Polytechnic, Ikorodu, Lagos, Department of Food Technology, }}}
\item[]{\small{\textit{$^{3}$Federal University of Technology, Akure, Nigeria, Department of Agricultural Engineering, }}}
\end{itemize*}
\index[author]{Olalusi, Ayo}
\index[author]{Bolaji, Olusola}
\index[author]{Isa, John}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
This research work was carried out to determine some engineering properties of the Jatropha seed("Lapalapa") at five different moisture content levels (25.9, 39.2, 41.5, 42.9 and \mbox{47.7\,\%}, dry basis). The result revealed that the major, intermediate and minor diameter increased with increase in moisture content. A similar observation was observed for the true density and porosity of jatropha seeds for all moisture content levels, unlike the bulk density which decreased with increase in moisture content level. The value obtained for sphericity were in the range of 0.82--\mbox{0.85\,\%}. The coefficient of static friction of jatropha seeds on mild steel, plywood, glass and aluminum were determined at all the moisture content levels.The coefficient of friction for mild steel, plywood, glass and aluminum  increased  with increase in moisture contents. A similar trend was observed was  for the angle of repose for all moisture content levels.However, the Bio"=yield point were high at moisture level 39.2 and \mbox{47.7\,\%} on longitudinal loading while a  low value was obtained  for  bio"=yield on axial loading at these moisture content levels. The modulus of elasticity (N/mm$^{2}$) was higher on longitudinal loading compared with on axial loading. A similar observation was noticed for bio"=yield stress (N/mm$^{2}$) for both longitudinal and axial loading.  The compressive strength of jatropha seeds on axial and longitudinal loading was higher and decreased with increase in moisture content. The Modulus of stiffness was 0 for all the moisture level on axial loading compared with longitudinal loading which increased from -29 to 0 as the moisture level increases.}

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\noindent \textbf{Keywords:} Bio"=yield point, Bio"=yield stress, jatropha, Mechanical properties, Physical properties
\index[key]{Bio"=yield point}
\index[key]{Bio"=yield stress}
\index[key]{Jatropha}
\index[key]{Mechanical properties}
\index[key]{Physical properties}
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