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The National Comorbidity Survey Replication by Kessler and colleagues found that of adult patients with major depressive disorder (MDD), 9.4% met Diagnostic and Statistical Manual of Mental Disorders, Third Edition-Revised criteria for attention-deficit/hyperactivity disorder (ADHD). Among those with dysthymia, 22.6% also met criteria for ADHD. In addition, it is estimated that approximately a third of the United States population experiences MDD symptoms at any point in time. Kessler and colleagues also conducted a retrospective study on impairment of adults with ADHD and found that ADHD has a prevalence of ∼4.4% in the US adult population, which suggests that ∼9 million US adults may have ADHD.
Thin films of Ni3Al formed by co-evaporation onto insulating substrates form a single phase fcc disordered lattice upon rapid solidification following excimer laserinduced melting with an interface velocity of ~4 m/s. Transmission Electron Microscopy (TEM) and x-ray diffraction (XRD) analyses exhibit no superlattice diffraction at room temperature. Resistivity measurements, indicating that the disordered phase has a higher resistivity and much smaller temperature coefficient at room temperature than the stable ordered (L12) phase, permit us to monitor phase changes and ordering on a fast time-scale. Subsequent annealing recovers long-range order, with resistivity measurements indicating that reordering begins just below 300°C.
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