since the time man observed his picture in the water, mirror has en-tered both man’s spiritual and material life. the role of mirror has un-dergone a lot of changes, ranging from foretelling to its use by barbers in different situations, to its use as warfare, mystic allegories, literal metaphors and historical narrations such as alexander mirror located in alexandria. the present study aims to...

Cu(OAc)(2)-mediated dehydrogenative cross-coupling between two heteroarenes has been realized in the absence of any other additive. A mechanism involving a formal Cu(II) to Cu(0) route by convergent disproportionation of the copper mediator is proposed and has been evidenced by copper mirror formation during the reaction. This synthetic protocol provides a concise and "green" access to unsymmet...

LEDs on Si offer excellent potential of low cost manufacturing for solid state lighting and display, taking advantage of the well-developed IC technologies of silicon. In this paper, we report how the performance of LEDs grown on Si can be improved. Multiple quantum well InGaN LED structure was grown on patterned silicon substrates and circular LEDs 160 µm in radius were processed. Fabricated L...

The title compound, [CuI(C(19)H(20)Br(2)N(2))], lies across a crystallographic mirror plane. The coordination around the copper centre is distorted trigonal planar, with a bite angle of 94.7 (3)°. A six-membered chelate ring in a chair conformation is formed by the coordination of the imine N atoms of the bidentate ligand to the Cu(I) atom. This conformation is required by the crystallographic ...

Metallography, SEM-EDS, and Raman Micro-Spectroscopy analysis were conducted on bronze dirk, sword, mirror excavated from the pit tomb No. 1-1 at 12th Point of Osong Site in Cheongju to study manufacturing techniques corrosion properties. The sword are judged be binary alloys Cu(79.16∼79.89 wt%)-Sn (19.12∼20.34 wt%). microstructure is a cast structure composed δ phase (α+δ) eutectoid, no heat t...

In this study, cup-shaped copper sheets were developed to improve heat dispassion for high-power light emitting diodes (LEDs) array module (3 × 3, 4 × 4, and 5 × 5) using an electroplating technique. The cup-shaped copper sheets were directly contacted with sapphire to enhance the heat dissipation of the chip itself. The lateral emitting light extraction and heat dissipation of high-power LEDs ...

Variable reflectance coatings (switchable mirrors) have significant advantages over traditional absorbing devices for radiant energy control in a variety of architectural and aerospace applications due to their large dynamic ranges in both transmission and reflection in the visible and near infrared regimes. Although electrochromic and gasochromic metal hydride films have been the primary focus...

This Letter reports oscillation of a far-infrared (FIR) waveguide laser on individual Stark components of the 496-,Am transition in CH3 F by the application of an electric field across the laser medium. Stark shifting of vibrational-rotational absorption lines into coincidence with C02-laser pump lines giving rise to FIR oscillation in the rotational transitions was first observed in ammonia.' ...

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