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" ... Because energy, momentum, and angular momentum are conserved, you have to go past both monopole and dipole moments; you need a specific change in how the masses are distributed around their mutual center of mass. The simplest way to imagine this is to take two masses and have them mutually rotate around their center of mass, which results in what we call quadrupole radiation. ... "
" ... The linear quadrupole ion trap at the University of Calgary, in Dr. Thompson's laboratory, makes use... [+] of the same quadrupole electric field with high-frequency oscillatory electric fields that Paul's original setup used. ... "
" ... The pulsar J0030+0451, based on NICER data, is shown to have 'hot spots' only in its southern ... [+] hemisphere, which means that a magnetic model involving only a typical magnetic dipole cannot explain what we observe. Here, a large quadrupole, from simulations, is shown to be a far superior fit to the data. ... "
" ... The radio-frequency quadrupole (RFQ) of the MACHINA project under development for analysis of... [+] heritage art pieces. RFQ's make up an essential part of radio-frequency particle accelerators and can be thought of as the lenses of the particle accelerator world: they help focus and accelerate the charged particles with their magnetic field. ... "