For designing a shielding, it is necessary, mainly, to determine or have access to the following parameters: transmission factors of the material used and type of radiation to be shielded. Cylindrical test specimens with different thicknesses were developed for experimentally obtaining the material transmission factor for shielding calculation. The cylindrical test specimens were made considering the geometric characteristics of the detector, the ease of production and the energy of 0.511 MeV from the 18 F-FDG decay. A type of concrete widely used in Brazil was used in the preparation of the cylindrical test specimens.
The fronthaul of the future 5G networks is expected to be the bottleneck for coping with the increasing data traffic demand. Despite optical fiber is the preferred alternative for fronthaul, technologies like phantom mode has boosted the data rates over copper lines. Previous works have investigated the application of phantom mode and its interaction with differential channels, but none has addressed the potential impact of the cable non-uniformities on the overall performance of copperbased networks. In this work we carried out simulations in order to investigate such impact on both ordinary differential and phantom channels. The obtained results indicate that nonuniformities must be taken into account for realistic data rate analysis in next-generation networks.
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