Coherent combining of broadband pulses after free space optical parametric amplification.

In this study, we present the experimental proof of concept of the polarization-based filled-aperture coherent combination of two distinct broadband (sub-20 fs transform limited pulse duration at around 795 nm central wavelength) optical parametric chirped pulse amplification systems in free space. An average combination efficiency of 90% is demonstrated.

A Whole Range of Cattle-An Isotopic Perspective on Roman Animal Husbandry in Lower Austria and Burgenland (Austria).

In this study, we try to combine traditional archaeozoological biometry, based on outer bone measurements, with stable isotope analyses of bone collagen. Right from the start of archaeozoological research in Central and Western Europe, the important size variability in Roman domestic cattle has puzzled scholars. According to an established view, these differences in bone size are attributed either to the simultaneous presence of different types or even breeds or to the result of crossbreeding of smaller, native, and larger Roman cattle.

Preparation of silyl-terminated branched polyethylenes catalyzed by Brookhart's nickel diimine complex activated with hydrosilane/B(CF).

Brookhart's nickel α-diimine complex [(κ-,-BIAN)NiCl] (1) (where BIAN = {Ar-NAceN-Ar}, Ace = acenaphthen-1,2-diyl, and Ar = 2,6-(iPr)-CH) activated with a hydrosilane/B(CF) (SiHB) adduct forms a highly active catalytic system for ethylene polymerization. Under optimal conditions, the activity of the system depends on the nature of hydrosilane and decreases in the order RSiH > PhSiH > PhSiH. The decrease in system activity within the hydrosilane series is correlated with increasing formation of Ni(I) species.

"Activated Borane": A Porous Borane Cluster Polymer as an Efficient Lewis Acid-Based Catalyst.

Borane cluster-based porous covalent networks, named activated borane (), were prepared by cothermolysis of decaborane(14) (-BH) and selected hydrocarbons (toluene, cyclohexane, ; and -hexane, ) under anaerobic conditions. These amorphous solid powders exhibit different textural and Lewis acid (LA) properties that vary depending on the nature of the constituent organic linker. For , its LA strength even approaches that of the commonly used molecular LA, B(CF).