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The microstructural features typical of depth hoar and ice‐crust layers in both blocks of snow and a firn core that were extracted at Summit, Greenland (72°35′ N, 38°25′ W) in June, 2017 have been characterized using x‐ray microcomputed tomography (micro‐CT). In the depth hoar, the density is much lower, and the porosity, pore sizes, and specific surface area (SSA) are greater than those in adjacent...
Near‐infrared adaptive optics as well as fringe tracking for coherent beam combination in optical interferometry require the development of high‐speed sensors. Because of the high speed, a large analog bandwidth is required. The short exposure times result in small signal levels which require noiseless detection. Both requirements cannot be met by state‐of‐the‐art conventional CMOS technology of near‐infrared...