Appraisers use them to detect forgeries of antiques. Many paints today contain phosphors that will glow under a black light, while most older paints do not contain phosphors. Repairmen use them to find invisible leaks in machinery -- they inject a little fluorescent dye into the fuel supply an...
There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of CD, DVD and software packaging, as well as just about everything sold as "official merchandise...
As the technology allows better and larger displays, you may start seeing them in places you would never have been able to find a screen before. OLEDs also allow individual pixels to be turned completely off, letting viewers see true black. Lots More Information Related Articles How LCDs ...
Electrons of different energy levels occupy different orbitals. Generally speaking, electrons with greater energy move in orbitals farther away from the nucleus. When an atom gains or loses energy, the change is expressed by the movement of electrons. When something passes energy on to an atom, ...
Have you seen investigators on crime shows who spray some stuff on a "clean" carpet and suddenly -- blood stains! Well, of all the fictional technology on TV, it turns out this stuff is real! Find out how luminol reveals the blood.
Flat band superconductivity induced by spatial extent of Wannier functions: We now introduce a different model for superconductivity in a narrow band. The model is defined on a two-dimensional square lattice with two electronic orbitals per unit cell. The Hamiltonian is given by ...
{_\alpha }/N\)is the probability to find the system in the\(\alpha \)th cell and\(\rho {_\alpha } = p{_\alpha }/\Delta \Omega _\alpha \)is the corresponding probability density.\(\hat{A}_{\alpha }\)is the average value of\(\hat{A}({\pmb \Gamma })\)computed over ...
The Principles of XRF Spectrometry XRF describes the process where some high-energy radiation excites atoms by shooting out electrons from the innermost orbitals. When the atom relaxes, that is, when outer electrons fill inner shells, X-Ray fluorescence radiation is emitted. All this happens without...
As the technology allows better and larger displays, you may start seeing them in places you would never have been able to find a screen before. OLEDs also allow individual pixels to be turned completely off, letting viewers see true black. LED FAQ What does LED stand for? LED stands for...
In the aftermath of the Boston Marathon bombings, the manhunt to end all manhunts was underway. There was just one problem -- in spite of their massive advantage in manpower and firepower, authorities couldn't seem to find the perpetrators. ...