Graduation Diploma is valid for only one (1) year in order to take the FDNY computer based. exam (Z-50). Candidates who fail the final examination on the second attempt shall be required to re-. attend the course in its entirety.
Quantum dots (QD) are very small semiconductor particles, only several nanometres in size, so small that their optical and electronic properties differ from those of larger particles. They are a central theme in nanotechnology.
A quantum dot is a semiconductor nanoparticle about 1-20 nm in diameter. Its structure is essentially the same as larger semiconductors. The electronic properties it displays can be very different, however. These properties are the result of the quantum size effect.