In this work, two advanced technologies were applied for manufacturing a bimorph wavefront corrector: laser ablation, to vaporize conductive silver coating from piezoceramic surface, and parallel-gap resistance microwelding, provide reliable electrical contact between the piezodisk surface electrodes copper wires. A step-by-step guide mirror production is presented, together with ‘bottlenecks’....

This work introduces a new and simple method for adjusting the gain of current mirror. The major advantage of the proposed architecture is that, unlike the conventional variable gain current mirror, it does not need the change of the biasing current to adjust current gain. Therefore, the power dissipation remains constant in all of the gain settings. In addition, the proposed variable gain curr...

In the title heterotrinuclear coordination compound, [CaCu(2)(C(9)H(4)NO(5))(2)(C(3)H(4)N(2))(2)(H(2)O)(3)]·7H(2)O, the Ca(2+) cation is in a penta-gonal-bipyramidal geometry and bridges two (1H-imidazole)[2-(oxaloamino)benzoato(3-)]copper(II) units in its equatorial plane. Each Cu(II) atom has a normal square-planar geometry. The mol-ecule has approximate local (non-crystallographic) mirror sy...

An x-ray multilayer mirror, specially designed to produce resonant absorption at a definite angle of incidence, may be used as an angular dispersive element for refractive x-ray radiography. In this method the signal-to-noise ratio can be significantly enhanced due to suppression of the shot noise produced by the direct beam. Refraction contrast of a copper wire 75 μm in diameter and a human ha...

Chiral crystal surfaces lack mirror or glide plane symmetry. Nevertheless, some chiral surfaces deviate more significantly from an achiral configuration, and thus possess greater enantioselective potential, than others. We describe a procedure to calculate chiral indices, IC (in Å), of any two-dimensional (2D) periodic atomic surface based on atomic displacements from ideal mirror or glide plan...

For eighty-six years, this journal has held a mirror to the world of archives and archivists, its authors writing ongoing analysis our professional ethics, theories, craft. The stated purpose is “to reflect thinking about theoretical practical developments in archival profession, particularly North America; relationships between archivists creators users archives; cultural, social, legal, techn...