gold coating
21Scanning electron microscope — These pollen grains taken on an SEM show the characteristic depth of field of SEM micrographs …
22Printed circuit board — Part of a 1983 Sinclair ZX Spectrum computer board; a populated PCB, showing the conductive traces, vias (the through hole paths to the other surface), and some mounted electrical components A printed circuit board, or PCB, is used to… …
23Mirror — looking glass redirects here. For other uses, see Looking Glass (disambiguation). This article is about wave reflectors (mainly, specular reflection of visible light). For other uses, see Mirror (disambiguation). A mirror, reflecting a vase A… …
24Sunglasses — For the Divine Brown song, see Sunglasses (song). Wearing sunglasses under direct sunlight: Large lenses offer good protection, but broad temple arms are also needed against stray light from the sides. Sunglasses or sun glasses are a form of… …
25Goldbricking — For other uses of the term goldbrick , see Gold brick (disambiguation). Goldbricking, in today s terms, generally refers to staff who use their work internet access for personal reasons while maintaining the appearance of working, which can lead… …
26Ultraviolet photography — is a photographic process of recording images by using light from the ultraviolet (UV) spectrum only.OverviewLight which is visible to the human eye covers the spectral region from about 400 to 750 nanometers. This is the radiation spectrum used… …
27Percussive maintenance — or percussion therapy, also known as a technical tap, is a term used to describe hitting a malfunctioning device in order to make it work correctly again. The origins of the term are unknown, nor how far back the practice dates, although… …
28Infrared heater — An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the infrared radiation ranges …
29Aerobot — An aerobot is an aerial robot, usually used in the context of an unmanned space probeWhile work has been done since the 1960s on robot rovers to explore the Moon and other worlds in the Solar system, such machines have limitations. They tend to… …
30Hydrargyrum medium-arc iodide lamp — Hydrargyrum medium arc iodide, or HMI, is a mercury halide gas discharge medium arc length lamp with a multi line spectra emission. The name implies that hydrargyrum, an archaic term for Mercury (Hg), is held as a vapour mixed with other rare… …
