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Using a specifically designed chemical tracer to indirectly measure local atmospheric hydroxyl radical (OH) concentrations is a very appealing concept. Such a tracer will provide information on the amount of OH a tracer encounters, as it moves through the urban environment and provide a stringent te ...

The hydroxyl radical (OH) plays a key role in determining indoor air quality. However, its highly reactive nature and low concentration indoors impede direct analysis. This paper describes the techniques used to indirectly quantify indoor OH, including the development of a new method based on the in ...

The nine panelists set out to address, very briefly, some of the key questions of the symposium. Seth Lloyd discusses the Maxwell demon paradox and the spin-echo effect, and how in some cases, in an apparent violation of the Second Law of Thermodynamics “entropy goes up and whoa, goes down then up. ...