Erich Sackman ו Ben-Shaul, Avinoam . In Press.
“A Short History Of Membrane Physics”. בתוך Handbook Of Lipid Membranes: Molecular, Functional, And Materials Aspects. Editors: C. Safinya And J. Raedler. Taylor and Francis.
The Big Match is a multi-stage two-player game. In each stage Player 1 hides one or two pebbles in his hand, and his opponent has to guess that number; Player 1 loses a point if Player 2 is correct, and otherwise he wins a point. As soon as Player 1 hides one pebble, the players cannot change their choices in any future stage.The undiscounted Big Match has been much-studied. Blackwell and Ferguson (1968) give an epsilon-optimalstrategy for Player 1 that hides, in each stage, one pebble with a probability that depends on the entire past history. Any strategy that depends on just the clock or just a finite memory is worthless (i.e., cannot guarantee strictly more than the least reward). The long-standing natural open problem has been whether every strategy that depends on just the clock and a nite memory is worthless.The present paper proves that there is such a strategy that is epsilon-optimal. In fact, we show that just two states of memory are sfficient.
Identifying the influence of atomic order on the catalytic reactivity of bimetallic catalysts is essential for their rational design. However, the synthesis of atomically-ordered nanostructures under mild conditions is not trivial and in many cases a mixture of various compositions is formed. Here we show a simple and highly versatile approach for synthesis of Pt-Co bimetallic nanoporous network (BNN) and demonstrate the influence of preparation conditions on the BNN’s atomic order and catalytic reactivity. High surface area Pt3Co BNN was prepared by reduction of [Co(NH3)5Cl][PtCl4] double complex salt crystals. The BNN phase was transformed from Pt3Co to segregated Pt and Co domains once the reduction temperature of the double complex salt crystals was elevated. High selectivity toward hydrodeoxygenation of biomass-derived 5-hydroxymethylfurfural into 2,5-dimethylfuran was obtained while catalyzing the reaction with Pt3Co BNN. The catalytic yield was deteriorated by more than an order of magnitude while catalyzing the reaction with BNN that was constructed of segregated Pt and Co domains. Spectroscopic analysis identified the presence of an oxidized Co species and a metallic Pt species in a close to 1:1 ratio on the Pt3Co BNN surface as crucial factors in lowering the activation energy of the dehydration reaction.
