Fabrication and Test of Spherical Primary Optical Telescope (SPOT) Segments
Spherical primary telescopes are cost effective for large segmented apertures. The SPOT segments are cast in pyrex and shaped to allow radius of curvature control. This paper discusses design, fabrication and performance of SPOT segments.
OBJECTIVE ::: To provide evidence for identification of the morphology and histology of Pinellia pedatisecta Schott. ::: ::: ::: METHODS ::: Using microscope and scanning electron microscope, characteristics of the Pinellia pedatisecta Schott. were studied comparatively. ::: ::: ::: RESULTS ::: The surface of leaves, fruits, testa and pollen grain of the cultivated Pinellia pedatisecta Schott. showed different characteristics. ::: ::: ::: CONCLUSION ::: The results of the study can be used for the identification of the Pinellia pedatisecta Schott. in Shandong.