We have studied ultrafast dynamics of photoexcited carriers in mc-Si:H by pump and probe laser spectroscopy. We have found that the dynamics of photoexcited carriers in mc-Si:H depend on the crystallinity of the material: in the samples with low crystalline fraction, the dynamics have a fast decay and resemble those in a-Si:H, while in the samples with high crystallinity the dynamics are slower...

The effects of temperature (25-40°C), H,SO, concentration (31-70% (w/v)) and the acid/substrate relationship (1-5 cm3 of H,SO, per g-' of cellulose) on the solubilization rate of microcrystalline cellulose and on the glucose production rate have been analysed. The solubilization process was by determining reducing groups present in solution. For acid/substrate relationships of more than 1 cm3 g...

Ammonium monoethyloxalate (AmEtOx) is proposed as a consolidanting agent for carbonate stones such biomicritic limestone and marble, resulting in the formation of microcrystalline passivating phase calcium oxalate (whewellite weddellite).