One comment on: ... "For instance, Dennis Cravens did not use a changing field in his sphere system which appears to work at very low temperatures. Why is he able to demonstrate apparent LENR at less than 100 C when all of the recent experiments require 1000 C and even then are difficult to prove? "
OK - Dennis used samarium cobalt in his mix. This material is known for permanent magnets. As for the "changing field" - things are not so simple - remember that SmCo was use in powder form - and it is in a hot active environment. There is every reason to suggest that the field was constantly changing at a rapid rate, due to thermal fluctuations and the properties of ferrimagnetism. Magnetized powder will always revert to the ferrimagnetic state without an external field to enforce polarity. With ferrimagnetic materials, the opposing moments are unequal - and a spontaneous but changing magnetization remains. http://coldfusionnow.org/cravens-demo-a-puzzle-for-onlookers/ Thus it is fair to conclude that the NI week demos employed a changing magnetic field which was in a positive feedback loop with the thermal gain.
