Assuming that flavin reduction is irreversible, values for kred over a range of NADPH concentrations can be used to derive the KD,NADPH (850 ± 82 μM) and the maximal rate of hydride transfer from NADPH to the flavin (22 ± 1.1 s–1) (inset, Figure 3).
As electrodes for Li-ion batteries, they varied in their behavior, but had a common feature: high irreversible capacity values and strong polarization between the discharge and charge curve, typical of disordered carbons.
Estimation with β-substituted model compounds (tetramethyldiaminoethane and dimethylaminoethanol), showed oxidation at only slightly lower voltage (0.85 and 0.87 V, respectively, irreversible; the values were obtained considering a blank sample to account for background oxidation, as shown in the Supporting Information).
The oxidation of carbon into CO2 is an irreversible system, the value of the transfer coefficient is α = 0.27.
We have also studied the system Ce4+/Ce3+ in H2SO4, which behaves as totally irreversible for any value of u.
The reduction of Fe(II) to Fe is an irreversible process, the value of αnα of the electrode reaction was calculated to be 0.31 and the diffusion coefficient of Fe(II) was calculated to be 9.53 × 10−7 cm2 s−1 at 343 K.
If an investment is irreversible, uncertainty raises the value of hoarding cash and waiting to see what happens.Gauging the fogQuantifying uncertainty is a more recent sport.
I looked into Pennsylvania, where hundreds of families have been left with ruined drinking water, toxic fumes in the air, industrialized landscapes, thousands of trucks and new roads crosshatching the wilderness, and a devastating and irreversible decline in property value.
In a 1980 paper Ben Bernanke, now chairman of the Federal Reserve, formalised this effect: since most investment is irreversible, uncertainty "increases the value of waiting for new information [and thus] retards the current rate of investment".
The real options reveal the strategic value behind irreversible investments under uncertainty, which fail to be assessed using the net present value (NPV) method.
