Carnot, interactive Java applet http://www.phy.ntnu.edu.tw/java/carnot/carnot.html
Carnot, calculates efficiency http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/carnot.html
Carnot, Otto and Diesel http://www.rawbw.com/~xmwang/GUIdemo.htm
Carnot, nice Java applet http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/carnot.htm
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to useful webpages