Compact coaxial

Two pellets, of porosities 0.41 and 0.48 respectively, were made by means of coaxial compaction of Alumina powder consisting of non porous spherical particles of size ca. 200A in diameter. Each pellet consists of 11 sections, and the compaction pressures of those sections were selected in such a way that no macroscopic porosity inhomogeneities would be present on the final pellet. The BET specific surface area of the pellets was calculated 100 15 m /gr. 

The submarine telephone cable application was the justification for the commercial PE plant, but in fact—with the outbreak of World War 2 in 1939—almost all the 4000 t of PE produced between 1939 and 1945 was used to insulate high-frequency radar cables. Commercial distribution of PE in the UK was suspended, secrecy was imposed, whilst PE was used to produce insulation for the coaxial cables of radar sets. Airborne radar, possible because of the compact cables available now with PE insulation, proved to be a critical advantage in the Battle of Britain and the Battle of the Atlantic, helping British supply ships to avoid German submarines. German Admiral Karl Donitz told Adolf Hitler in May 1943 What is now decisive is that enemy aircraft have been equipped with a new location apparatus. .. which enables them to detect submarines and to attack them unexpectedly in low cloud, bad visibility or at night [10]. 

In 2008, using the same protective foam as a substrate, Vallozzi et al. [11] proposed a 2.45 GHz patch antenna with dual polarization, allowing to implement polarization diversity using a single, compact, wearable antenna. The antenna, shown in Fig. 26.7, employs a simple nearly square topology with a small slot in the center and with two coaxial feeds positioned symmetrically on the two patch diagonals. This allows the... 

Couette Mixer - To further investigate the physics of the electrification process in transformer oil/cellulosic systems, a compact Couette flow system of coaxial cylinders for electrification measurements is shown in Fig. 4, where the inner cylinder can rotate at speeds giving laminar and turbulent flows as well as the transition cellular convection regime (Melcher et al., 1986 Lyon, 1987). The cylinder walls on either side of the oil gap can be bare metal or can be covered with oil-impregnated paper used in transformers. 

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