3,398 research outputs found
Origin of Discrepancies in Inelastic Electron Tunneling Spectra of Molecular Junctions
We report inelastic electron tunneling spectroscopy (IETS) of multilayer
molecular junctions with and without incorporated metal nano-particles. The
incorporation of metal nanoparticles into our devices leads to enhanced IET
intensity and a modified line-shape for some vibrational modes. The enhancement
and line-shape modification are both the result of a low lying hybrid metal
nanoparticle-molecule electronic level. These observations explain the apparent
discrepancy between earlier IETS measurements of alkane thiolate junctions by
Kushmerick \emph{et al.} [Nano Lett. \textbf{4}, 639 (2004)] and Wang \emph{et
al.} [Nano Lett. \textbf{4}, 643 (2004)].Comment: 4 pages, 4 figures accepted for publication in Physical Review
Letter
Black Holes and (0,4) SCFTs from Type IIB on K3
We study the central charges and levels of 2d
superconformal field theories that are dual to four- and five-dimensional BPS
black holes in compactifications of type IIB string theory on a K3 surface.
They arise from wrapping a D3-brane on a curve inside K3 and have
transverse space either an ALE or ALF space. These D3-branes have an AdS near horizon geometry where is a discrete
subgroup of . We compute the central charges and levels of the 2d SCFTs
both in the microscopic picture and from six-dimensional
supergravity. These quantities determine the black hole entropy via Cardy's
formula. We find agreement between the microscopic and macroscopic
computations. The contributions from one-loop quantum corrections to the
macroscopic result are crucial for this matching.Comment: 36 pages; v2: published version, footnotes added, minor typos
correcte
Resolution Trust Corp. v. Cityfed Financial Corp.: The State Law and Federal Common Law Distinction
Resolution Trust Corp. v. Cityfed Financial Corp.: The State Law and Federal Common Law Distinction
RECONCILING NEGATIVITY WITH POSITIVE LEADERSHIP: A PRACTICAL APPLICATION
Purpose: The main goal of this article is to reconcile the concept of negativity with positive leadership approaches in a real-world setting.Methodology: We interviewed Mr. Paul Fayad, ex-President & Chief Executive Officer (CEO) of HHA Services, to describe his experience in implementing positive leadership and the role of negativity, and superficially negative behaviors, in creating an engaged workforce.Findings: Effective positive leadership is not unerringly optimistic in all moments and in all things. Instead, it is a responsibility to create a positive work environment for everyone working in your company. This means that managers have to not only keep their people happy, but also eliminate the negative, which can be the wrong people, the wrong process, the wrong equipment, or other processes that should be eliminated. In the elimination of this negative, sometimes critical (or focused-negative) behaviors are required of the “positive leader”.Implications: Negativity is a part of positive leadership, especially during the hiring process and critical conversation. The importance of addressing negativity is discussed
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Sensory sensitivity as a link between concussive traumatic brain injury and PTSD.
Traumatic brain injury (TBI) is one of the most common injuries to military personnel, a population often exposed to stressful stimuli and emotional trauma. Changes in sensory processing after TBI might contribute to TBI-post traumatic stress disorder (PTSD) comorbidity. Combining an animal model of TBI with an animal model of emotional trauma, we reveal an interaction between auditory sensitivity after TBI and fear conditioning where 75 dB white noise alone evokes a phonophobia-like phenotype and when paired with footshocks, fear is robustly enhanced. TBI reduced neuronal activity in the hippocampus but increased activity in the ipsilateral lateral amygdala (LA) when exposed to white noise. The white noise effect in LA was driven by increased activity in neurons projecting from ipsilateral auditory thalamus (medial geniculate nucleus). These data suggest that altered sensory processing within subcortical sensory-emotional circuitry after TBI results in neutral stimuli adopting aversive properties with a corresponding impact on facilitating trauma memories and may contribute to TBI-PTSD comorbidity
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