The dust absorbs all impinging photons and reradiates them at longer wavelengths. ESD can also be caused by energetic charged particles impinging on an object. Consequently, the infrared radiation impinging on the product is virtually doubled. Sciatica can be caused by tumors impinging on the spinal cord or the nerve roots. The source can be current on a wire, applied electric field or impinging plane wave. The initial study of impinging stagnation flows are due to C.Y. Wang. There is a delay between the molecule impinging on the surface and rebounding from it. The small and finite set of contexts and causes impinging on them is clearly delineated. In this ideal case, all the energy impinging on the crystal emerges from the crystal. Goddard's first liquid-fuel engine used a single impinging injector. Further digging was abandoned for fear of impinging on the integrity of the building.