According to the problems of,low heat transfer ability and large space possession existed in plant economizer,this paper deals with,how to seek the optimum design of rectangular fin on economizer pipe,for a given fin profile area,It establishes a optimization model.

A Dynamic Non-Interference Algorithm for Rectangles;

Fraunhofer-Diffraction on a class of figuresconstructed ellipse and rectangle;

Through comparing and analyzing several selective projects: rectangle (square), special hexagon and circle, a conclusion is made that in the wireless blind-chess guidin.

Semi analytical calculation method of thermal distribution in multilayer rectangular model system;

Method of Calculation for Rectangular Curved Beam Bridge;

Comparative analysis on rectangular non-uniform sampling algorithm and log-polar transformation algorithm of image;