Common sense The possibilities of enhancing glass melting by preliminary mechanical activation of quartz sand in a pulverizer in different conditions are examined. It was shown that mechanical activation destroys the crystal structure and increases the degree of amorphization （ 粉碎机 ） of quartz. As a result, silicate and glass formation processes are blended in the region of lower temperatures, which decreases the glass melting temperature by 80°C. [more]

How easy is it to use? The Electronic compass （ 电子罗盘 ） is truly a hand-held machine (about the size and weight of a mobile phone) with an attractive ergonomic case, designed to withstand some of the rigours of outdoor use (the unit is waterproof but not submersible). Much of the weight of the unit is due to the six AA batteries used to power the GPS receiver and the liquid crystal display. Despite the fact that the LCD is very clear and bright, it is the GPS receiver which consumes most of the power. Silva has taken a minimalist approach to designing the keypad which has a choice [more]