Abstract The quality of Aluminum oxynitride (AlON) powder is the main factor affecting properties ceramics. To accurately control nitrogen AlON content and improve dispersion degree powder, was prepared from γ-Al 2 O 3 activated carbon by carbothermic reduction nitridation. uniformity distribution raw materials dimension microstructure controlled changing time rotation rate ball milling process...

H. pylori infection is usually acquired in early childhood. Its role in gastrointestinal and extra intestinal complaints and serious consequences in adulthood make it as challenging issues. Despite different clinical presentations, in most children, the presence of H. pylori infection does not lead to clinically apparent disease, even when it causes chronic active gastritis. Some of most import...

Summay.-The effects of specific versus variable practice on retention and transfer was investigated. 30 participants were randomly assigned to one of three practice conditions. The variable speed group practiced on a pursuit rotor task at three different speeds (60, 45, 30 rpm) which were randomly distributed but equal in number for 30 10-sec. trials on Day 1. The Specific Practice group perfor...