* @param col the specified article's column.
*/
public void activateArticle(int row, int col){
if (articles[row][col]!=null) {
ActivationChainReaction reaction = articles[row][col].getActivationChainReaction();
if(reaction.canActivate(row, col, this)){
activatedCount=reaction.react(row, col, this);
activated = true;
activatedRow = row;
activatedCol = col;
}