This paper presents K-band-stepped, double-ridged square horn antennas fabricated by metallic 3D printing technology in copper (85% copper and 15% stannum) and aluminum alloy (89.5% aluminum, 10% silicon, and 0.5% magnesium). Compared with the popular dielectric 3D-printed horn antenna, the metallic counterpart features better mechanical robustness in terms of material. Moreover, the metallic h...

The role of religion and spirituality in coping with disease and promoting health has been reported from many parts of the World. However, no scientific studies on the use of prayers for health and wellbeing have been reported from Pakistan. A cross-sectional survey, using a self-administered questionnaire, was conducted among 1342 graduate and undergraduate students in the twin cities of Islam...

Because my expertise is in early American history, I will concentrate on Larry Kramer’s portrait of pre-Revolutionary popular constitutionalism, which acts as a baseline against which to measure nineteenth-century developments. Before examining pre-Revolutionary constitutionalism, however, I want to note two features of Kramer’s style of historical argument that make the book a particularly sop...

IT is difficult to imagine a case more deserving of detailed historical analysis than that of John Roberton (1776-1840), a surgeon who practised as a specialist in the treatment of venereal disease in two European capitals' yet is linked to a subject, medical police, which, on close examination, occupied a fraction of his known professional life. Despite his widely published popular works on ve...

Given the abundance of cameras and LCDs in today's environment, there exists an untapped opportunity for using these devices for communication. Specifically, cameras can tune to nearby LCDs and use them for network access. The key feature of these LCD-camera links is that they are highly directional and hence enable a form of interference-free wireless communication. This makes them an attracti...

We develop an approach to utilize anisotropic metamaterials to solve one of the fundamental problems of modern plasmonics--parasitic scattering of surface waves into free-space modes, opening the road to truly two-dimensional plasmonic optics. We illustrate the developed formalism on the examples of plasmonic refractor and plasmonic crystal, and discuss limitations of the developed technique an...