Ecological reactive powder concrete(ECO-RPC)was prepared by replacing 60% of cement with ultra-fine industrial waste powders and replacing ground fine quartz sands with natural sands.

用超细工业废渣取代60%的水泥，用普通黄砂取代磨细石英砂制备生态型RPC材料。

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Resonant frequency can be changed by loading the antenna with a reactive tuning component, which can be placed between the antenna element and the ground plane.

共振频率可以改变被动的加载与调谐组件，它可与天线单元和接地层放置天线。

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But the traffic increase has slowed progress in reducing emissions further, and people in many areas still suffer from nitrogen-related air pollution, including small particulates that get sucked deep into the lungs, and ground-level ozone - a strongly irritant gas formed by the action of sunlight on reactive nitrogen.

BBC: Nitrogen pollution 'costs EU up to ?280bn a year'