The problems of mm propagation: rain attenuation,  depolarization and gaseous absorption are considered, and the estimate of the energy potential of wireless mobile data transport networks is given. The dependence on the output power of the distance and the total losses, and the necessary signal levels for different types of modulation being shown.  The estimate of the interfering transmitters effect of side lobes of the antenna is given.  

Keywords: radio wave propagation, mm range, energy potential, rain clutter, side lobes, polar pattern

"The paper presents the solids control dust. Powered device for solids control dust and gas flow. The advantage of this device is that the air flow is not introduced sensor, distorts the parameters of the air flow. The necessary circuit device, and the necessary formulas for the calculation. "

Keywords: Air flow, dust-gas flow, solids, piezoelectric transducer, vibration, tailing.

`

Keywords: