The disclosure is directed to gastric stimulation programmers, stimulators and methods for controlling delivery of gastric stimulation therapy to maintain the efficacy of the therapy over time. Over a semiconductor layer, patterned features are formed. The system also includes a mixer arranged within the exhaust passage downstream of the aperture. This shadow scan system allows a circuit to remain operational while a snapshot of the core logic information is scanned out. At preparation step S3 for synthetic resin, an ionic material for decomposing the less water-soluble alkaline earth metal salt is admixed with a mixture of the resin kneaded product and the aqueous dispersion of the less water-soluble alkaline earth metal salt. Such products may in some aspects have characteristics defined by values of transmittance, absorbance, reflectance, roughness and a series of micrographs realized with a microscope of atomic force to see the morphology and structure of the anti-reflection glass.