Twisted hollow waveguides with noncircular cross sections may be considered as slow-wave structures. In a twisted waveguide, propagating radio frequency (rf) waveguide modes can have phase velocities slower than those of similar modes in a straight waveguide. This property is interesting since a twisted waveguide basically has a uniform cross section along the propagation direction. In such a w...

its neighbours, above and below. A good rule is that the space between any two pavilions should be about equal to 1^ times the height of such pavilions?thus if a pavilion be 75 feet high, the distance between it and its neighbour should be not less than 90 to 100 feet. The pavilions may be built radiating like the spokes of a wheel (like several of the Central Jails in India) or in form of a ho...

Despite significant advances in metallurgy and the potential to create high ultra-high-strength steel, all international specifications for steel design provide little information about limits of slenderness high-strength sections (HSSs) don’t anything (UHSSs). The current codes such as AISC 360-16 EC3 can be applied only grades up S690 S460, respectively, according their limitations. These app...