% $BI=Bj(B   SPMODEL $B%5%s%W%k%W%m%0%i%`%I%-%e%a%s%H(B
%        1 $B<!850\N.3H;6J}Dx<0(B ($B<~4|6-3&>r7o(B) 
%
% $BMzNr(B   2002/09/04 $BC]9-(B $B??0l(B
%        2004/02/18 $B>.9b(B $B@5;L(B
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[a4j,12pt]{jarticle}
%
% $B%W%j%"%s%V%k(B
%
\usepackage{Dennou6}                      % dennou-sty-6 $B$r;HMQ(B

\Dtitle[1 $B<!850\N.3H;6J}Dx<0%b%G%k(B]       % $B%X%C%@It%?%$%H%k(B, $B%b%G%kL>$HF1$8(B
{ {\large SPMODEL $B%5%s%W%k%W%m%0%i%`(B} \\  % $B$3$3$OJQ99$7$J$$(B 
  1 $B<!850\N.3H;6J}Dx<0%b%G%k(B \\           % $B%b%G%kL>(B
  {\large advdiff1.f90, advdiff2.f90, advdiff3.f90}     % $B%W%m%0%i%`L>(B
}
%
\Dauthor[$BC]9-(B $B??0l(B, $B>.9b(B $B@5;L(B]{$BC]9-(B $B??0l(B, $B>.9b(B $B@5;L(B}            % $BCx<T(B
\Ddate{2004 $BG/(B 3 $B7n(B 19 $BF|(B}                % $BF|IU(B
\Dnoparindent                             % $BCJMn$N;z2<$2$r$7$J$$(B
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% $BK\J83+;O(B
%
% $B4pK\E*$J>O@a9=@.$O0J2<$NDL$j(B. 
%
%   1. $B$O$8$a$K(B 
%   2. $B;YG[J}Dx<07O(B
%   3. $BN%;62=(B
%   4. $BMxMQ%b%8%e!<%k$H$=$NB>$N@_Dj(B
%   5. $B?tCM<B83(B
%   6. $B;29MJ88%(B
%   -. $B<U<-(B
% 
% $BI,MW$K1~$8$F9=@.$rJQ99$9$k$3$H(B.
%
\begin{document}

\maketitle                                % $B%?%$%H%k$N:n@.(B
\tableofcontents                          % $BL\<!$N:n@.(B
\pagebreak                                

%----------------------------------------------------------------------
\Dparskip
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$B35MW(B}

SPMODEL $B%5%s%W%k%W%m%0%i%`!X(Badvdiff1.f90$B!Y(B, $B!X(Badvdiff2.f90$B!Y$*$h$S(B
$B!X(Badvdiff3.f90$B!Y$KMQ$$$i$l$F$$$k4pACJ}Dx<0$H6-3&>r7o(B, $B$*$h$S(B, $B$3$N%W%m(B
$B%0%i%`$rMQ$$$??tCM<B83$NJ}K!$K$D$$$F2r@b$9$k(B. $B4pACJ}Dx<0$O(B, 1 $B<!85$N0\(B
$BN.3H;6J}Dx<0$G$"$k(B.  $B7W;;$O%9%Z%/%H%kK!$rMQ$$$F9T$$(B, $BE83+$O%U!<%j%(5i(B
$B?t$rMQ$$$F9T$&(B. $BGH?t@ZCG$O;03Q@ZCG$G$"$k(B. $B%9%Z%/%H%kJQ49$H5UJQ49$*$h$S(B
$BHyJ,1i;;$K$O(B, SPMODEL  $B%i%$%V%i%j(B(spml)$B$rMQ$$$F$$$k(B. $B;~4V@QJ,K!$O(B
$B!X(Badvdiff1.f90$B!Y$G$O(B Euler  $B%9%-!<%`(B, $B!X(Badvdiff2.f90$B!Y$H!X(Badvdiff3.f90$B!Y(B
$B$G$O0\N.9`$K(B  Adams-Bashforth $B%9%-!<%`$rMQ$$(B,  $B3H;69`$K$O(B Crank
Nicholson $B%9%-!<%`$rMQ$$$k(B. $B!X(Badvdiff3.f90$B!Y$G$O(B, $B0\N.9`$H3H;69`$r7W;;(B
$B$9$k;~9o%l%Y%k$r$:$i$7$FJ}K!(B(operator splitting method)$B$rMQ$$$?(B. $B?tCM<B(B
$B83$G$O=i4|$K%G%k%?4X?tE*$JJ,I[$rM?$($?>l9g$N;~4VH/E8$r7W;;$9$k(B.


{\bf $B%W%m%0%i%`L>(B} \\                  % $B%W%m%0%i%`L>(B
{\footnotesize
advdiff1.f90, advdiff2.f90, advdiff3.f90
}

{\bf $B%W%m%0%i%`<hF@85(B}\\               % $B%W%m%0%i%`<hF@@h(B
{\footnotesize
http:\slash \slash www.gfd-dennou.org\slash arch\slash spmodel\slash 1d-cyclic-e\slash advection-diffusion\slash SIGEN.htm
}

{\bf SPMODEL $B%5%s%W%k%W%m%0%i%`L\<!(B}\\ % $B%5%s%W%k%W%m%0%i%`L\<!(B($BJQ99$7$J$$(B)
{\footnotesize
 http:\slash \slash www.gfd-dennou.org\slash arch\slash spmodel\slash sample.htm 
}

{\bf SPMODEL $B$N;H$$J}(B}\\               % SPMODEL $B$N;H$$J}(B($BJQ99$7$J$$(B)
{\footnotesize
http:\slash \slash www.gfd-dennou.org\slash arch\slash spmodel\/
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$B;YG[J}Dx<07O(B}
$B$3$3$G$O;YG[J}Dx<07O$H6-3&>r7o$r5-$9(B. 

\subsection{$B;YG[J}Dx<07O(B}
$B;YG[J}Dx<0$O(B 1 $B<!85$N0\N.3H;6J}Dx<0$G$"$k(B.
\begin{eqnarray}
   \DP{C}{t} + u\DP{C}{x} = D\DP[2]{C}{x},
   \Deqlab{$B;YG[J}Dx<07O(B}  
\end{eqnarray}

$B3F5-9f$O0J2<$NNL$r$"$i$o$9(B. $B0J2<$G$O(B $u$ $B$ODj?t$H$9$k(B.
\begin{table}[h]
 \begin{center}
  \begin{tabular}{c l l  } \hline
   $B5-9f(B    &\qquad\qquad&  $BJQ?t(B/$BJ*M}Dj?t(B   \\ \hline 
   $x$      && $B?eJ?0LCV(B        \\
   $t$      && $B;~4V(B            \\ 
   $u$      && $BN.B.(B            \\ 
   $C$      && $B?6I}(B            \\ 
   $D$      && $B3H;678?t(B        \\ \hline
  \end{tabular} 
 \end{center}
 \caption{$BJQ?t(B, $BJ*M}Dj?t$NDj5A(B}
% \Dtablab{}
\end{table}

\subsection{$B6-3&>r7o(B}

$B?eJ?J}8~$N6-3&>r7o$O<~4|6-3&>r7o$G$"$k(B. 
$B$9$J$o$A(B, $B?eJ?7W;;NN0h$r(B $x_{m}$ $B$H$9$k$H(B,
\[
  C(x+x_{m}) = C(x),
\]
$B$G$"$k(B.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$BN%;62=(B}
$B$3$N@a$G$OJ}Dx<07O$N6u4VN%;62=$*$h$S;HMQ$7$?;~4V@QJ,K!$K$D$$$F@bL@(B, 
$B%W%m%0%i%`Fb$G<B:]$KMQ$$$i$l$F$$$kJ}Dx<0$r5-=R$9$k(B.

\subsection{$B?eJ?N%;62=(B}
$B;YG[J}Dx<0$NN%;6I=8=$O0J2<$N$h$&$K$J$k(B.
\begin{eqnarray}
   \DP{C_{i}(t)}{t} + u\DP{C_{i}(t)}{x} = D\DP[2]{C_{i}(t)}{x}.
\Deqlab{$B6u4VN%;62=$7$?<0(B}
\end{eqnarray}
$B$3$3$G2<IU$-E:;z(B $i$ $B$O?eJ?3J;RE@(B $x_{i}$ $B>e$G$NCM$r<($9(B. 


\subsection{$B?eJ?J}8~$N%9%Z%/%H%kI=8=(B}
$B6u4VN%;62=$7$?;YG[J}Dx<0(B\Deqref{$B6u4VN%;62=$7$?<0(B}$B$r%9%Z%/%H%kK!$rMQ$$(B
$B$FI=8=$9$k(B. $B6u4VJ}8~$N%9%Z%/%H%kE83+$O%U!<%j%(5i?t$rMQ$$$F9T$&(B. $B0J2<$G(B
$B$O(B $k$ $B$r(B $x$ $BJ}8~GH?t(B, $K$ $B$r@ZCGGH?t(B, $I$ $B$r(B $x$ $BJ}8~3J;RE@?t$H$9$k(B.

$C_{i}(t)$ $B$O%9%Z%/%H%k5UJQ49$K$h$C$F0J2<$N$h$&$KE83+$5$l$k(B:
\begin{equation}
  C_{i}(t) = \sum _{k=0}^{K}
  \exp\left(\frac{2\pi i k x_{i}}{x_{m}}\right)\hat C_{k}.
  \Deqlab{$B%9%Z%/%H%k5UJQ49(B}
\end{equation}
$B%9%Z%/%H%k78?t(B $\hat C_{k}$ $B$O0J2<$N%9%Z%/%H%kJQ49$K$h$C$FM?$($i$l$k(B:
\begin{equation}
  \hat C_{k} = \frac{1}{I}
  \sum _{i=0}^{I-1}\exp\left(-\frac{2\pi i k x_{i}}{x_{m}}\right)C_{i}.
  \Deqlab{$B%9%Z%/%H%kJQ49(B}
\end{equation}
\Deqref{$B%9%Z%/%H%k5UJQ49(B}, \Deqref{$B%9%Z%/%H%kJQ49(B}$B$h$j(B, 
\Deqref{$B6u4VN%;62=$7$?<0(B}$B$N%9%Z%/%H%kI=8=$O0J2<$N$h$&$K$J$k(B.
\begin{equation}
  \DP{\hat C_{k}}{t} =
  - u \left(\frac{2\pi i k}{x_{m}}\right) \hat C_{k}
  +  D\left(\frac{2\pi i k}{x_{m}}\right)^{2}\hat C_{k}.
  \Deqlab{$B;YG[J}Dx<0$N%9%Z%/%H%kI=8=(B}
\end{equation}

\newpage
\subsection{$B;~4V@QJ,(B}
$B$3$3$G$O;~4V@QJ,K!$K$D$$$F5-=R$7(B, $B%W%m%0%i%`Fb$G<B:]$KMQ$$$i$l$F$$$kJ}(B
$BDx<0$r5-=R$9$k(B. $B0J2<$G$O(B $\Delta t$ $B$r;~4V3J;R4V3V(B, $B;~9o(B $\tau \Delta
t$  $B$K$*$1$k(B $\hat C_{k}$ $B$NCM$r(B $\hat C_{k}^{\tau}$ $BEy$HI=$9(B.

\subsubsection{Euler $B%9%-!<%`(B}

Euler $B%9%-!<%`$rMQ$$$F(B\Deqref{$B;YG[J}Dx<0$N%9%Z%/%H%kI=8=(B}$B<0$r;~4VJ}8~(B
$B$KN%;62=$9$k$H(B, $B0J2<$N$h$&$KI=$5$l$k(B.
\begin{equation}
  \hat C_{k}^{\tau +1} = \hat C_{k}^{\tau} 
  + \Delta t \left\{
    - u \left(\frac{2\pi i k}{x_{m}}\right) \hat C_{k}^{\tau} 
    + D\left(\frac{2\pi i k}{x_{m}}\right)^{2}\hat C_{k}^{\tau}\right\} .
  \Deqlab{Euler $B%9%-!<%`$K$h$jN%;62=$5$l$?<0(B}
\end{equation}

\subsubsection{Adams-Bashforth + Crank Nicholson $B%9%-!<%`(B}

$B0\N.9`$K(B Adams-Bashforth $B%9%-!<%`(B, $B3H;69`$K$O(B Crank Nicholoson $B%9%-!<(B
$B%`$rE,MQ$7$F(B\Deqref{$B;YG[J}Dx<0$N%9%Z%/%H%kI=8=(B}$B<0$r;~4VJ}8~$KN%;62=$9(B
$B$k(B.
%
\begin{equation}
  \frac{\hat C_{k}^{\tau+1} - \hat C_{k}^{\tau}}{\Delta t} =
    - \frac{u}{2}\left(\frac{2\pi i k}{x_{m}}\right)
      \left(3\hat C_{k}^{\tau} - \hat C_{k}^{\tau-1}\right)
    + \frac{D}{2}
       \left(\frac{2\pi i k}{x_{m}}\right)^{2}
      \left(\hat C_{k}^{\tau+1}+\hat C_{k}^{\tau}\right)
\end{equation}
%
$B$7$?$,$C$F(B, 
%
\begin{equation}
  \left\{
  1 - \frac{D\Delta t }{2}\left(\frac{2\pi i k}{x_{m}}\right)^{2}\right\}
  \hat C_{k}^{\tau +1}
  = \hat C_{k}^{\tau}  
    - \frac{u\Delta t}{2}\left(\frac{2\pi i k}{x_{m}}\right)
      \left(3\hat C_{k}^{\tau} - \hat C_{k}^{\tau-1}\right)
    + \frac{D\Delta t }{2}
       \left(\frac{2\pi i k}{x_{m}}\right)^{2}\hat C_{k}^{\tau}
\end{equation}
%
$B$H$J$k(B.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$B;HMQ%b%8%e!<%k$H$=$NB>$N@_Dj(B}

$B%9%Z%/%H%kJQ49$H5UJQ49(B, $BHyJ,1i;;$O(B SPMODEL $B%i%$%V%i%j(B (spml) $B$N(B
ae\_module $B$K4^$^$l$k4X?t$rMQ$$$F9T$&(B. spml $B$,2<0L$G;HMQ$9$k(B ISPACK $B$N(B
$B;EMM$+$i(B, $B3J;RE@?t(B $I$ $B$O6v?t$G(B, $B$+$D(B $I/2=2^{a}3^{b}5^{c}$ ($a, b, c$ 
$B$O(B 0 $B$^$?$O@0?t(B) $B$G$J$1$l$P$J$i$J$$(B. $BHs@~7A9`$N7W;;$K$h$C$F@8$8$k%(%j(B
$B%"%8%s%0$rKI$0$?$a(B, $B3J;RE@?t(B $I$ $B$H@ZCGGH?t(B $K$ $B$O(B $I>3K$ $B$rK~$?$9$h$&(B
$B$KM?$($k(B.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$B?tCM<B83(B}

\begin{figure}[p]
\begin{center}
\Depsf[][100mm]{./figs/advdiff1-1.ps}
\caption{Euler $B%9%-!<%`$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. 
         $t=0.0, 0.1, 0.2$ $B$K$*$1$kJ,I[(B. $BGK@~$O2r@O2r$rI=$9(B.}
\Dfiglab{advdiff1-1}

\Depsf[][100mm]{./figs/advdiff1-2.ps}
\caption{Euler $B%9%-!<%`$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. $x$-$t$ $BCGLL?^(B.} 
\Dfiglab{advdiff1-2}
\end{center}
\end{figure}

\begin{figure}[p]
\begin{center}
\Depsf[][100mm]{./figs/advdiff2-1.ps}
\caption{Adams-Bashforth + Crank Nicholson $B%9%-!<%`$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. 
         $t=0.0, 0.1, 0.2$ $B$K$*$1$kJ,I[(B. $BGK@~$O2r@O2r$rI=$9(B.}
\Dfiglab{advdiff2-1}

\Depsf[][100mm]{./figs/advdiff2-2.ps}
\caption{Adams-Bashforth + Crank Nicholson $B%9%-!<%`$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. $x$-$t$ $BCGLL?^(B.} 
\Dfiglab{advdiff2-2}
\end{center}
\end{figure}


\begin{figure}[p]
\begin{center}
\Depsf[][100mm]{./figs/advdiff3-1.ps}
\caption{Adams-Bashforth + Crank Nicholson $B%9%-!<%`$H(B operator splitting $BK!(B
        $B$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. 
         $t=0.0, 0.1, 0.2$ $B$K$*$1$kJ,I[(B. $BGK@~$O2r@O2r$rI=$9(B.}
\Dfiglab{advdiff3-1}

\Depsf[][100mm]{./figs/advdiff3-2.ps}
\caption{Adams-Bashforth + Crank Nicholson $B%9%-!<%`$H(B operator splitting $BK!(B
         $B$rMQ$$$?>l9g$N?tCM7W;;$N7k2L(B. $x$-$t$ $BCGLL?^(B.} 
\Dfiglab{advdiff3-2}
\end{center}
\end{figure}

$x$ $BJ}8~L58BNN0h$G$N(B\Deqref{$B;YG[J}Dx<07O(B}$B<0$N2r@O2r$N0l$D$H$7$F(B
%
\begin{equation}
  C(x,t) = \frac{C_0}{2\sqrt{\pi D t}} \exp\left[-\frac{(x-ut)^2}{4Dt}\right]
\end{equation}
%
$B$,B8:_$9$k(B. $B$3$l$O=i4|>uBV(B $t=0$ $B$G(B $x=0$ $B$K%G%k%?4X?tE*$JJ,I[$,(B,  $B;~(B
$B4V$,$?$D$K$D$l$F0\N.$5$l$D$D3H;6$7J,I[$,9-$,$C$F$$$/2r$G$"$k(B.

$B$=$3$G(B, $B=i4|>r7o$H$7$F(B
%
\begin{equation}
  C(x,0) = \frac{1}{2\sqrt{\pi D t_{0}}}
           \exp\left[-\frac{(x-0.25x_{m})^2}{4Dt_{0}}\right]
\end{equation}
%
$B$rM?$($k$3$H$K$9$k(B. $B$3$3$G(B $t_{0}=10^{-2}$ $B$H$7$?(B. $B?eJ?7W;;NN0h$NBg$-(B
$B$5(B $x_{m}$$B$O(B $x_{m}=5.0$ $B$H$9$k(B. $B$=$NB>$N%Q%i%a!<%?(B $u, D$ $B$O$=$l$>$l(B
$u=10.0, D=1.0$ $B$H$9$k(B.

$B3J;RE@?t(B $I$ $B$H@ZCGGH?t(B $K$ $B$O$=$l$>$l(B $I=64, K=31$ $B$H$9$k(B. $B;~4V3J;R4V(B
$B3V$O(B, $B!X(Badvdiff1.f90$B!Y(B(Euler $B%9%-!<%`$rMQ$$$k>l9g(B)$B$G$O(B $\Delta
t=10^{-4}$ sec, $B!X(Badvdiff2.f90$B!Y$H!X(Badvdiff3.f90$B!Y(B(Adams-Bashforth +
Crank Nicholson $B%9%-!<%`$rMQ$$$k>l9g(B)$B$G$O(B $\Delta t=10^{-3}$ sec $B$G$"(B
$B$k(B. $B7W;;%9%F%C%W?t$O$=$l$>$l(B 2,000 $B$H(B 200 $B$G$"$k(B.

$B7W;;7k2L$r(B\Dfigref{advdiff1-1}$\sim$\Dfigref{advdiff3-2}$B$K<($9(B. 
\Dfigref{advdiff1-1}, \Dfigref{advdiff2-1}, \Dfigref{advdiff3-1}
$B$G$O2r@O2r$rGK@~$G<($7$F$$$k$,(B, $B?tCM2r$H$[$\0lCW$7$F$$$k$?(B
$B$a?^Cf$G$O6hJL$,$G$-$J$$$3$H$KCm0U$5$l$?$$(B.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section{$B;29MJ88%(B}
\begin{description}
 \item $BC]9-??0l(B, $B@P2,7=0l(B, $B?9@nLwBg(B, $B>.9b@5;L(B, $B@PEO@5<y(B, $BNS>M2p(B, SPMODEL $B3+H/%0%k!<%W(B, 
       2004: 
       $B3,AXE*CO5eN.BNNO3X%9%Z%/%H%k%b%G%k=8(B (SPMODEL),\\
       http:\slash \slash www.gfd-dennou.org\slash arch\slash spmodel\slash ,
       $BCO5eN.BNEEG>6f3ZIt(B. 

  \item Spiegelman, M., 2002: Myth \& Methods in Modelling, \\
        http:\slash \slash www.ldeo.columbia.edu\slash \~\,spieg\slash mmm\slash

\end{description}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage                                  % $B2~%Z!<%8(B
\section*{$B<U<-(B}                           % $B<U<-(B. $B$3$N$^$^MxMQ$9$k(B.
\markright{$B<U<-(B}                          % $B%X%C%@$KI=<((B
\addcontentsline{toc}{section}{$B<U<-(B}      % $BL\<!$KI=<((B

$BK\;q8;$O(B, $BCO5eN.BNEEG>6f3ZIt$N%$%s%?!<%M%C%H>e$G$N3X=QCN<1$N=8@Q$H3hMQ(B
$B$N<B83$N0l4D$H$7$F(B
\begin{center}
 http:\slash \slash www.gfd-dennou.org\slash arch\slash spmodel\slash 
\end{center}
$B$K$*$$$F8x3+$5$l$F$$$k$b$N$G$"$k(B 
(\copyright $BCO5eN.BNEEG>6f3ZIt%9%Z%/%H%k%b%G%k%W%m%8%'%/%H(B 
spmodel@gfd-dennou.org 2002. ). 
$BK\;q8;$O(B, $BCx:n<T$N=t8"Mx$KDq?($7$J$$(B($BLBOG$r$+$1$J$$(B)$B8B$j$K$*$$$F<+M3$K(B
$BMxMQ$7$F$$$?$@$$$F9=$o$J$$(B. $B$J$*(B, $BMxMQ$9$k:]$K$O:#0lEY<+$iFbMF$r3N$+$a(B
$B$k$3$H$r$*4j$$$9$k(B($BL5J]>ZL5@UG$86B'(B).

$BK\;q8;$K4^$^$l$k85;q8;Ds6!<T(B($B?^Ey$NHG85Ey$r4^$`(B)$B$+$i$O(B,  $BD>@\E*$J7A$G(B
$B$N(B WEB $B>e$G$NCx:n8"$^$?$O;HMQ5vBz$rF@$F$$$J$$>l9g$,$"$k$,(B,  $B>!<j$J$,$i(B, 
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 spmodel@gfd-dennou.org
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