Expansion Tank. An expansion tank (aka a recovery tank) is fit to sealed radiator. It either has no filler neck or it is sealed with a blanking cap which does not react to or produce pressure. It simply seals the rad aside from the vent and hose to the expansion tank.
Natural Environment Teaching. Natural Environment Teaching (NET) is utilizing principles of Applied Behavior Analysis to teach in the natural environment, âthe real worldâ. Because children with autism are not typically motivated to learn new things, Natural Environment Teaching can be particularly necessary and particularly difficult.
A natural experiment is an empirical study in which individuals exposed to the experimental and control conditions are determined by nature or by other factors outside the control of the investigators, but the process governing the exposures arguably resembles random assignment. Thus, natural experiments are observational studies and are not controlled in the traditional sense of a randomized experiment. Natural experiments are most useful when there has been a clearly defined exposure involving a well defined subpopulation (and the absence of exposure in a similar subpopulation) such that changes in outcomes may be plausibly attributed to the exposure.