经过不同研磨时间制得4组不同粒度的废玻璃粉,采用激光粒度分析仪测定废玻璃粉的粒度分布;采用灰色关联分析方法分析废玻璃粉粒度分布对活性指数的影响。结果表明:只有当废玻璃粉的粒径小于一定的值时才具有火山灰活性;对废玻璃粉活性指数起关键作用的粒径范围为6.414~<20.710μm。
There are 27 user-controllable LEDs on the DE2-70 board. Eighteen red LEDs are situated above the 18 toggle switches, and eight green LEDs are found above the pushbutton switches (the 9th green LED is in the middle of the 7-segment displays). Each LED is driven directly by a pin on the Cyclone II FPGA; driving its associated pin to a high logic level turns the LED on, and driving the pin low t