An artificial grass surface suited for bordering a runway of an airfield in order to reduce the presence of birds in the airfield. The memory array is arranged in rows and columns, and can be further arranged in addressable blocks. A continuous mesh layer is connected to the top end of at least one of the side walls and provides ventilation to the interior of the container. There exists no rigid coupling between the disc and the hub, meaning that radial vibrations of the hub result in compression or decompression of the flexible joint, rather than in translation of the disc. The electronic system is configured to transition to a power mode corresponding to the context responsive to the control signals. Also encompassed by the invention are pharmaceutical compositions comprising a nanoparticulate composition of the invention, methods of making and using such nanoparticulate and pharmaceutical compositions.