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Lewis, N. S. & Nocera, D. G. Powering the planet: chemical challenges in solar energy utilization. Proc. Natl Acad. Sci. USA 103, 15729–15735 (2006). This measure may further be used to estimate the MTTF (see [ 30, 31]), which will then also depend on the time between the tests (the periodic testing interval).Matheson D, Matheson J. The Smart Organization – Creating Value Through Strategic R&D, Boston. MA, USA: Harvard Business School Press; 1998

Alonso, A. M. et al. Generation of strong, homochiral bases by electrochemical reduction of phenazine derivatives. Chem. Commun. 412–413 (2004). GLYCOL, CETEARYL GLUCOSIDE, CREATINE, SALICYLIC ACID, XANTHAN GUM, PARAFFINUM LIQUIDUM / MINERAL OIL / Kim, D., Whang, D. R. & Park, S. Y. Self-healing of molecular catalyst and photosensitizer on metal–organic framework: robust molecular system for photocatalytic H 2 evolution from water. J. Am. Chem. Soc. 138, 8698–8701 (2016). The active maintenance time is, as defined in Ref. [ 20], “Duration of the maintenance action, excluding logistic delays.” Per the definition, other delays such as technical delays are thus included in the active maintenance time. The measure is often referred to as “the effective time to repair” (see e.g., [ 12]). This is regardless of whether the repair is performed in one go.

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