etching chemical
21freeze etching — a technique for preparing specimens for electron microscopy. The unfixed tissue is frozen and then split with a knife and a layer of ice is sublimed from the exposed surface. The resultant image is thus not distorted by chemical fixatives …
22dot etching — noun : a method in printing of correcting the color or tones of a halftone negative or positive usually utilizing the chemical reduction of halftone dots * * * Print. a method of making corrections in halftone positives or negatives by using… …
23Printed 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… …
24Semiconductor device fabrication — Semiconductor manufacturing processes 10 µm 1971 3 µm 1975 1.5 µm 1982 …
25Ohmic contact — An ohmic contact is a region on a semiconductor device that has been prepared so that the current voltage (I V) curve of the device is linear and symmetric. If the I V characteristic is non linear and asymmetric, the contact is not ohmic, but is… …
26Microelectromechanical systems — (MEMS) (also written as micro electro mechanical, MicroElectroMechanical or microelectronic and microelectromechanical systems) is the technology of very small mechanical devices driven by electricity; it merges at the nano scale into… …
27photoengraving — /foh toh en gray ving/, n. 1. a photographic process of preparing printing plates for letterpress printing. 2. a plate so produced. 3. a print made from it. [1870 75; PHOTO + ENGRAVING] * * * Any of several processes for producing printing plates …
28Microfabrication — Synthetic detail of a micromanufactured integrated circuit through four layers of planarized copper interconnect, down to the polysilicon (pink), wells (greyish) and substrate (green) Microfabrication is the term that describes processes of… …
29Photolithography — For earlier uses of photolithography in printing, see Lithography. For the same process applied to metal, see Photochemical machining. Photolithography (or optical lithography ) is a process used in microfabrication to selectively remove parts of …
30Pad printing — is a printing process that can transfer a 2 D image onto a 3 D object. This is accomplished using an indirect offset (gravure) printing process that involves an image being transferred from the printing plate (cliché) via a silicone pad onto a… …
