Off-axis systems with freeform mirrors is a design approach of increasing importance for space instruments. While the off-axis reflective approach allows simple, versatile and obstruction free designs, the use of freeform surfaces allows to achieve better optical performance and/or compactness. In re...
Natural form language appears in ceramic design in the form of group flowers. From the perspective of ceramic decoration techniques,it can be divided into two kinds:figurative figure and abstract figure. The concrete natural figure is the true portrayal of the natural object,the style is direct,c...