2632397 EFEM energy-filtered electron microscopy 3 2632405 EFEM embedment-free electron microscopy 2 2632396 EFEM European Federation for Experimental Morphology 2 2632403 EFEM Edge Feature Enhancement Module 1 2632399 EFEM efficient feature extraction module 1 2632398 EFEM energy finite element method 1 2632404 EFEM Energy-filtered transmission electron microscopy 1 2632402 EFEM explicit finite element model 1 2632401 EFEM extended Frenkel exciton model 1 2632400 EFEM external factor evaluation matrix 1