Runners training for a marathon can get a stress fracture if they. escalate their training too quickly. Stress fractures occur when too much weight or stress is put on a weakened bone. It's often the result of an imbalance in bone health caused by actions that outpace the body's natural bone rebuilding process. See Stress Fracture Risk Factors.
idf - Computer Definition. A distribution frame that serves as an intermediate point of inside cable and wire interconnection between the main distribution frame (MDF) and the terminal blocks or terminal outlets. See also MDF.
Medium-density fibreboard (MDF) is a fibre composite material comprising of refined wood fibres, adhesive (resin), process additives, and a minor amount of wax. MDF is produced in a dry fibre process, and by definition, wood-based MDF-panels have densities between 450 and 800 kg/m3 (EN 316, 1999).