Abstract: Provided are antenna arrays based on three-dimensional special-shaped wave-absorbing structures by the disclosure, and includes an antenna array fixing plate and a plurality of antenna array units, where the antenna array units are sequentially fixed on the antenna array fixing plate; each of the plurality of antenna array units includes an antenna transmitting channel, two antenna receiving channels and a pair of three-dimensional special-shaped wave-absorbing structures; the antenna transmitting channel is used for transmitting antenna signals; the antenna receiving channels are used for receiving the antenna signals; and the three-dimensional special-shaped wave-absorbing structures are used for isolating antenna signals of antenna transmitting channels of other antenna array units.

Abstract: A device for integrated control of acid wastewater plugging and discharging of an abandoned mine includes an airtight wall, a central controller, a CO2 gas source, an agent bucket, a siphon pipe I and a liquid storage bucket are arranged on the outer side of the airtight wall, and a plurality of monitoring sensors are arranged in the inner side of the airtight wall, and the monitoring sensors are electrically connected to the central controller; and a flood discharge valve is arranged at the bottom of the airtight wall. The device is miniaturized and operates for a long time with low power consumption, thereby achieving long-term unattended operation and maintenance.

Abstract: The present invention discloses a heat exchanger capable of automatically adjusting heat exchange area, which relates to the field of heat exchangers. The key points of the technical solution of the present invention include a heat exchange wall, which includes a fixed heat exchange wall, and a self-adjusting heat exchange wall that can automatically expand and contract according to the flow or temperature of the fluid to change the heat exchange area. The present invention can automatically change the heat exchange area, and timely respond and adapt to different working conditions, having simple structure, low production cost and good stability.