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The specification of the steel slag aggregate will be mutated if the aggregate is prepared by a single type crusher. The specification stability of the steel slag improved significantly when the jaw crusher and the cone-crusher are combined in the crushing process. The combination of the crusher and screen is applied to produce steel slag aggregate while the roller washing process for removing the dust from the surface of aggregate. A pilot production line has been established by this technology. The specification stability and the road performance indicators of the steel slag aggregates have been greatly improved by this pilot production line as compared with the traditional production line. The particulate of the steel slag aggregate is decreased by 81% compared to the traditional line.

Front-end Butterworth low-pass filter in navigation system is necessary and essential, but the tedious design processes usually take engineers into trouble. This paper presents a relatively fast methodology with the assistance of the symbolic calculus in MATLAB, and demonstrates the full process through a practice design specification. Due to the discrete value of passive components such as resistors and capacitors, the proper attempts are also needed. Simulation using Pspice verify the final results to guarantee the feasibility of the theoretical design derived.