The positive interaction is an effect of a separate usage of the battery by the two technologies.
Combining renewable energy sources, as photovoltaic arrays (PV), wind turbine (WT), biomass fuel generators (BM), with back-up units to form a Hybrid Renewable Energy System HRESS) can provide a more economic and reliable energy supply architecture compared to the separate usage of such units.
Regarding the "number of times" they had sought CAM therapy, it was difficult for respondents to give a specific number whenever it was not easy to separate usage into discrete entities (taking remedies daily over a period of two weeks, taking Yoga classes twice a week, praying regularly several times a day, etc).
PC1 clearly separates usage measures from citation measures.
We found that the most salient distinction is made by PC1 which separates usage from citation measures with the exception of Citation Betweenness centrality and Citation Immediacy.
To our knowledge, the similar phenomenon, separate base usages or codon usages of the genes located on the leading and lagging strands has been observed in four bacterial genomes, B. burgdorferi, T. pallidum, C. trachomatis and C. muridarum.
One way to accomplish this is to separate out usage-as-development versus usage-as-production, and price accordingly.
This phenomenon, i.e., separate base usages of the genes in the two strands of replication, is similar to the separate codon usages observed previously in B. burgdorferi [ 19], T. pallidum [ 20] and C. trachomatis [ 21], where CA of RSCU was used instead of CA of the variables u1 – u1.
This particular distribution of citation measures along PC1 points to an interesting, alternative interpretation of PC1 simply separating the usage from the citation measures.
Frank and Lobry suggested that the separate codon usages observed in B. burgdoreferi may be an exceptional case [ 6].
Interestingly, the separate codon usages of the genes transcribed on the two strands was also observed in T. pallidum and C. trachomatis, respectively [ 20, 21].
