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.
MDF (Medium Density Fibreboard). MDF is a type of hardboard which is made from wood fibres glued under heat and pressure. MDF has many qualities that make it an ideal alternative to plywood or chipboard. It is dense, flat, stiff, has no knots and is easily machined.ardboard is a compressed, composite board. Fibre residuals are saturated in a wet process and then compressed to a sheet. A fine fibre overlay is applied (normally to one side) to provide smooth face. Three basic types are available-standard, medium and oil-tempered.