In view of problems of high energy consumption, many fault points and bad reliability caused by TKD speed-regulation mode used by electrical control system of hoist of old auxiliary shaft of a Coal Mine, the paper proposed a reform scheme of medium-voltage belt keeper frequency-conversion speed-regulation system with double three-level based on PLC
For democracy to work as it Coil Set should, three fundamental elements are needed: engaged citizens, communities that act together, and institutions with legitimacy that empower citizens.But when this does not happen, it is necessary to look for new ways to introduce citizens to the exercise of democratic practices.To that effect, this article see
The study of pesticide metabolism in crops is critical for assessing the mode of action and environmental risks of pesticides.However, the study of pesticide metabolism in crops is usually complicated and it is often a daunting challenge to accurately screen the metabolites of novel pesticides in complex matrices.This study demonstrated a combined
In this article we describe the implementation of Freeform Optics Raytracer with Manufacturable Imaging Design cApaBiLitiEs (FORMIDABLE): an optical design library capable of simulating optical systems by ray-tracing.Optical performance can be quantified and optimised using third-party optimisation Computer Adaptor algorithms.Compared to available