... certification environmental factors Special Note from the Editor: Many homeowners believe that solar energy is not sufficiently reliable to use for heating their homes. In the past, this belief was too often well founded. As expected with any innovation, there were maintenance problems...

...Lance Manuel; Paul S. Veers; Steven R. Winterstein International standards for wind turbine certification depend on finding long-term fatigue load distributions that are conservative with respect to the state of knowledge for a given system. Statistical models of loads for fatigue application...