749 research outputs found
Particulate plutonium released from the Fukushima Daiichi meltdowns
Traces of Pu have been detected in material released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) in March of 2011; however, to date the physical and chemical form of the Pu have remained unknown. Here we report the discovery of particulate Pu associated with cesium-rich microparticles (CsMPs) that formed in and were released from the reactors during the FDNPP meltdowns. The Cs-pollucite-based CsMP contained discrete U(IV)O2 nanoparticles,Peer reviewe
Matuyama-Brunhes boundary age constrained by SHRIMP U-Pb zircon dating of a widespread tephra
3-D time-periodic finite element analysis of magnetic field in non-oriented materials taking into account hysteresis characteristics
Problems in analyzing 3-D stationary nonlinear magnetic field in non-oriented material taking into account hysteresis characteristics and eddy current, such as finite element formulation and convergence of nonlinear iteration, are discussed</p
Exact solutions to Bayesian and maximum likelihood problems in facial identification when population and error distributions are known
Numerical and experimental investigations of current distribution at the joint between AC superconducting cable and normal conducting plate
The effect of the configuration of the joint between an ac superconducting cable and a normal conducting plate on the current distribution and the joule loss is investigated by using the 3-D finite element method. It is shown that the concentration of current can be reduced by changing the configuration of joint. The effectiveness of the analysis is verified by measuring the current distribution on the surface of a copper plate and the quenching current </p
Extraction and visualization of semitransparent isosurfaces for 3-D finite element analysis
The NMDA agonist D-cycloserine facilitates fear memory consolidation in humans
Animal research suggests that the consolidation of fear and
extinction memories depends on N-methyl D-aspartate (NMDA)-
type glutamate receptors. Using a fear conditioning and extinction
paradigm in healthy normal volunteers, we show that postlearning
administration of the NMDA partial agonist D-cycloserine (DCS)
facilitates fear memory consolidation, evidenced behaviorally by
enhanced skin conductance responses, relative to placebo, for
presentations of a conditioned stimulus (CS) at a memory test
performed 72 h later. DCS also enhanced CS-evoked neural
responses in a posterior hippocampus/collateral sulcus region and
in the medial prefrontal cortex at test. Our data suggest a role for
NMDA receptors in regulating fear memory consolidation in humans
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