introduction: the aim of this study was to compare several metallurgic properties of neoniti instrument with four other commonly used endodontic rotary files. methods and materials: neoniti a1 (25/0.08), race (25/0.06), mtwo (25/0.06), twisted file (25/0.06) and protaper next x2 (25/0.06) were examined by differential scanning calorimetry (dsc) before and after heat treatment at 500 ° c. x-ray ...

Conventional active noise control (ANC) systems attempt to minimize pressure at an error sensor (or sensors) to achieve control, and often result in a relatively small zone of control. Considering a practical application in a vehicle, this approach is acceptable provided the operator’s head remains within the control zone. In the case of an earthmoving machine, an operator’s head regularly move...