Stacking energy

An overall DMFC stack energy conversion efficiency of 35% was achieved over a range of stack operating conditions of 0.46-0.57 V per cell. An extended life test over llOOh on a five-cell stack made of identical cell components and stack configurations was also performed. 

Figure 2.11 shows the stack energy conversion efficiency as a function of stack voltage and stack power output. The stack energy conversion efficiency is calculated by the voltage efficiency (= average cell voltage of a stack/1.21 V) times its... 

Figure 2.11 Stack energy conversion efficiency plotted against stack current (a) and stack power output (b) from the results of steady-state stack performance obtained at selected operating conditions listed in Table 2.2.

Stacking energy. The energy of interaction that favors the face-to-face packing of purine and pyrimidine base pairs. 

A. Fiethen, G. Jansen, A. Hesselmann, M. Schiitz, Stacking energies for average B-DNA structures from the combined density functional theory and symmetry-adapted perturbation theory approach. J. Am. Chem. Soc. 130, 1802-1803 (2008)... 

G-9 Electrolysis cell stack energy consumption as a function of cell stack current density, 220... 

TABLE 7.19 Stacking Energy (in kcal mol for Nucleic Acid Base Pairs... 

Sponer, J. Jurecka, R Marchan, I. Luque, F. J. Orozco, M. Hobza, P. Nature of base stacking Reference quantum-chemical stacking energies in ten unique B-DNA base-pair steps, Chem. Eur. J. 2006,12, 2854-2865. 

What we have learned is that dislocation nucleation will occur once 4>i np) reaches its maximum allowable value. This idea is depicted graphically in fig. 11.19 where it is seen that instability to dislocation nucleation occurs when (Siip) = Yus, where yus is a material parameter that Rice has christened the unstable stacking energy. This idea is intriguing since it posits that the competition between cleavage and dislocation nucleation has been reduced to consideration of the relative values of two simple material parameters, both of which admit of first-principles determination, and relevant geometrical factors. 

P. Hobza and J. Sponer, Toward true DNA base-stacking energies MP2, CCSD(T), and complete basis set calculations, J. Am. Chem. Soc. 124, 11802-11808 (2002). 

We first consider why base sequence effects can affect the thermodynamic stabilities of double-stranded DNA. The neighboring base-base stacking energies have been analyzed in detail (e.g., see [116, 117]). These interactions are base sequence dependent because of potential steric clashes and electrostatic effects between the... 

TABLE 4.2 Average Structural Parameters and Calculated Stacking Energies of B-DNA Dinucleotides"... 

Dinucleotide Twist (Degrees) Propeller Twist (Degrees) Roll (Degrees) Slide (A) Stacking Energies (kcal/mol dimer)... 

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