Understanding the relationship between catalytic selectivity and surface structures of heterogeneous catalysts is essential for high-performance catalysis. In this issue Chem, Zhu et al. report a puzzle-solving strategy relying on single-crystal foils Pearson correlation analysis to determine dependence activity principal parameters. Heterogeneous catalysis solid surfaces represents most pervas...

We show that there are infinitely many binary strings z, such that the sum of the on-line decision complexity of predicting the even bits of z given the previous uneven bits, and the decision complexity of predicting the uneven bits given the previous event bits, exceeds the Kolmogorov complexity of z by a linear term in the length of z.

T he textbook paradigm of economywide development rests on the premise of “balanced growth”: that is, on the presumption that all sectors will grow in unison over time as a country gets richer. This view has served us reasonably well in several circumstances, particularly those pertaining to macroeconomic models of long-term growth. An implicit view that growth is balanced across sectors, or so...

The aim of this study was to determine the optimal cutting cycle in an uneven-aged beech forest in the North of Iran. First of all, a logistic growth model was determined for an uneven aged forest. Then, the stumpage price was predicted via an autoregressive model. The average stumpage price of beech was derived from actual timber, round wood, fire and pulpwood prices at road side minus the var...