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Mask Alignment and Exposure
One of the most significant steps in the photolithography process is mask alignment. A mask or "photomask" is a square glass plate with a patterned emulsion of metal film on single side. The mask is aligned with the wafer, so that the pattern can be transfer onto the wafer surface. Every mask after the first one must be aligned to the last pattern.
Once the mask has been accurately allied with the pattern on the wafer's surface, the photo resist is exposed by the pattern on the mask with a high intensity ultraviolet light. There are three primary exposure methods: contact, proximity, and projection. They are shown in the figure below.
Heat capacity: Heat capacity of furnace depend on (1) Thermal conductivity (2) Specific heat and (3) Specific gravity of refractory. The dense and heavy fire clay
Identify a major process equipment or operation in your work environment which has the highest risk and develop a detailed report on 1) process hazard analysis (PHA) and 2) HZOP to
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Steam at 400C, 100 bar in an insulated cylinder is rapidly decompressed to 10 bar, by unlocking the piston and permitting the gas to expand, with a constant external pressure of 10
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Define Cohesive energy Cohesive energy can be described as the difference among the average energy of the atoms of a solid (especially a crystal) and that of the free atoms.
The functions of the oxide layer are to: 1. mask against diffusion or ion-implant 2. passivate the surface electrically and chemically 3. isolate one device from another
Two parallel planes 1.2x1.2 are splited by a distance of 1.2 m. the emissivity's of the planes are 0.4 and 0.6, and the temperature are 760 and 300 oC, correspondingly. A 1.2x1.2 r
relevance of surveying and geoinformatics to chemical engineering
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