Wright-Patterson Air Force Base

About: Wright-Patterson Air Force Base is a other organization based out in Wright-Patterson AFB, Ohio, United States. It is known for research contribution in the topics: Laser & Microstructure. The organization has 5817 authors who have published 9157 publications receiving 292559 citations. The organization is also known as: Wright-Patterson AFB & FFO.

Obsessive-compulsive disorder: a disorder of pessimal (non-functional) motor behavior.

Abstract: In the present study, we examined the sequential(temporal) structure of motor behavior in patientssuffering from obsessive–compulsive disorder(OCD). OCD is a chronic psychiatric problem(1, 2), with a lifetime prevalence of 1–3% (3, 4).Obsessions are recurring, persistent thoughts,impulses or images that intrude into awarenessand cause marked distress or anxiety. Compulsionsare repetitive physical behaviors such as checkingor mental behaviors such as counting things, andoccur in response to an obsession with strictlyapplied rules (DSM-IV; 5). The most commonOCD behavior is that of compulsive checking(6, 7), which may be performed for hours and inZor R, Keren H, Hermesh H, Szechtman H, Mort J, Eilam D.Obsessive–compulsive disorder: a disorder of pessimal (non-functional)motor behavior.Objective: To determine whether in addition to repetitiveness, themotor rituals of patients with obsessive–compulsive disorder (OCD)involve reduced functionality due to numerous and measurable actsthat are irrelevant and unnecessary for task completion.Method: Comparing motor rituals of OCD patients with behavior ofnon-patient control individuals who were instructed to perform thesame motor task.Results: Obsessive–compulsive disorder behavior comprises abundantacts that were not performed by the controls. These acts seemunnecessary or even irrelevant for the task that the patients wereperforming, and therefore are termed non-functional . Non-functionalacts comprise some 60% of OCD motor behavior. Moreover, OCDbehavior consists of short chains of functional acts bounded by longchains of non-functional acts.Conclusion: The abundance of irrelevant or unnecessary acts in OCDmotor rituals represents reduced functionality in terms of taskcompletion, typifying OCD rituals as pessimal behavior (antonym ofoptimal behavior).

Enhanced fluorescence properties of carbon dots in polymer films

Abstract: Carbon dots of small carbon nanoparticles surface-functionalized with 2,2′-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA–carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization–passivation in the carbon dots. These fractions, as well as carbon nanoparticles without any deliberate surface functionalization, were dispersed into poly(vinyl alcohol) (PVA) for composite films. In the PVA film matrix, the carbon dots and nanoparticles exhibited much enhanced fluorescence emissions in comparison with their corresponding aqueous solutions. The increased fluorescence quantum yields in the films were determined quantitatively by using a specifically designed and constructed film sample holder in the emission spectrometer. The observed fluorescence decays of the EDA–carbon dots in the films and in the solution were essentially the same, suggesting that the significant enhancement in fluorescence quantum yields from the solution to films is static in nature. Mechanistic implications of the results, including a rationalization in terms of the compression effect on the surface passivation layer (similar to a soft corona) in carbon dots when embedded in the more restrictive film environment resulting in more favorable radiative recombinations of the carbon particle surface-trapped electrons and holes, and also potential technological applications of the brightly fluorescent composite films are highlighted and discussed.

Ionic Conductivity of Polymer-Ceramic Composites

Abstract: The paper analyzes ionic conductivity data in the PEO:LiBF 4 -MgO and PEO:LiBF 4 -BaTiO 3 composite electrolyte systems. The polymer and ceramic phases in the systems interact to provide a stable, amorphous phase The ceramic phase is believed to impart a dual effect. It suppresses crystallization of and interacts with the polymer phase. The nature of the interaction is believed to be dipole-dipole and driven by a dielectric constant gradient. The nanosize ceramic powder provides higher conductivity values because of an enhanced interaction. At low temperatures (≃20°C) the dipole-dipole interaction is favored, whereas at high temperatures (≃100°C) a reverse trend is observed. A very high dielectric constant material such as BaTiO 3 provides little additional benefit.

Pseudomorphic Yttrium Iron Garnet Thin Films With Low Damping and Inhomogeneous Linewidth Broadening

Abstract: Nanometer-thick yttrium iron garnet films, grown on gadolinium gallium garnet substrates by pulsed laser deposition, exhibit remarkably high crystallinity and atomically smooth surfaces. The pseudomorphic growth mechanism leads to large negative out-of-plane uniaxial anisotropy, narrow resonance linewidths, and minimal damping. Magnetic resonance measurements indicate that both the Gilbert damping parameter and inhomogeneous linewidth broadening $\Delta H_{pp,0}$ are consistently low for films of various thicknesses. Even at film thickness $\approx 20$ nm, we attain $\alpha \approx 2\times 10^{-4}$ and $\Delta H_{pp,0} \approx 1$ Oe, which are among the lowest values ever reported.