4,906 research outputs found
Microwave transport approach to the coherence of interchain hopping in (TMTSF)2PF6
We report a microwave study of the longitudinal and transverse transport
properties of the quasi-one-dimensional organic conductor (TMTSF)PF in
its normal phase. The contactless technique have provided a direct measurement
of the temperature profile of the resistivity along the {\bf b'} direction and
in magnetic fields up to 14 T. A characteristic energy scale ()
has been observed which delimits a transient regime from an insulating to a
metallic behavior. This anomalous profile is discussed in terms of the onset of
coherent transport properties along the {\bf b'} direction below 40 K. This is
also supported by the observation of a finite longitudinal and transverse
magnetoresitances only below 40 K, indicative of a two-dimensional regime.
Below , however, strong deviations with respect to a Fermi liquid behavior
are evidenced.Comment: 4 pages, 5 figures, submitted to Euro.Phys.J.
Alien Registration- Poirier, Lionel P. (Lewiston, Androscoggin County)
https://digitalmaine.com/alien_docs/27875/thumbnail.jp
The kinetics of homogeneous melting beyond the limit of superheating
Molecular dynamics simulation is used to study the time-scales involved in
the homogeneous melting of a superheated crystal. The interaction model used is
an embedded-atom model for Fe developed in previous work, and the melting
process is simulated in the microcanonical ensemble. We study
periodically repeated systems containing from 96 to 7776 atoms, and the initial
system is always the perfect crystal without free surfaces or other defects.
For each chosen total energy and number of atoms , we perform several
hundred statistically independent simulations, with each simulation lasting for
between 500 ps and 10 ns, in order to gather statistics for the waiting time
before melting occurs. We find that the probability distribution
of is roughly exponential, and that the mean value depends strongly on the excess of the initial steady temperature of the
crystal above the superheating limit identified by other researchers. The mean
also depends strongly on system size in a way that we have
quantified. For very small systems of atoms, we observe a persistent
alternation between the solid and liquid states, and we explain why this
happens. Our results allow us to draw conclusions about the reliability of the
recently proposed Z method for determining the melting properties of simulated
materials, and to suggest ways of correcting for the errors of the method.Comment: 19 pages, 8 figure
Retrospective evaluations of sequences: Testing the predictions of a memory-based analysis
Retrospective evaluation (RE) of event sequences is known to be biased in various ways. The present paper presents a series of studies that examined the suggestion that the moments that are the most accessible in memory at the point of RE contribute to these biases. As predicted by this memory-based analysis, Experiment 1 showed that pleasantness ratings of word lists were biased by the presentation position of a negative item and by how easy the negative information was to retrieve. Experiment 2 ruled out the hypothesis that these findings were due to the dual nature of the task called upon. Experiment 3 further manipulated the memorability of the negative items – and corresponding changes in RE were as predicted. Finally, Experiment 4 extended the findings to more complex stimuli involving event narratives. Overall, the results suggest that assessments were adjusted based on the retrieval of the most readily available information
InP and GaAs characterization with variable stoichiometry obtained by molecular spray
Both InP and GaAs surfaces were studied in parallel. A molecular spray technique was used to obtain two semiconductor surfaces with different superficial compositions. The structures of these surfaces were examined by electron diffraction. Electron energy loss was measured spectroscopically in order to determine surface electrical characteristics. The results are used to support conclusions relative to the role of surface composition in establishing a Schottky barrier effect in semiconductor devices
Study on the neuronal circuits implicated in postural tremor and hypokinesia
The effect of various tegmentary lesions at the level of the pontomesenchphalon in monkeys on motor function was observed. The importance of the monoaminergic mechanisms of the brainstem is discussed. The results also show the importance of the descending tegmentary rubral system and the rubroolivocerebellar circuit in controlling peripheral motor activity. The destruction of the sensory motor cortex proves to be a more effective way of eliminating spontaneous or harmaline induced tremor than the complete interruption of the pyramidal system on the level of the cerebral peduncle
Memory strategies mediate the relationships between memory and judgment
In the literature, the nature of the relationships between
memory processes and summary evaluations is still a debate.
According to some theoretical approaches (e.g., “two-memory
hypothesis”; Anderson, 1989) retrospective evaluations are
based on the impression formed while attending to the to-be assessed stimuli (on-line judgment) – no functional
dependence between information retrieval and judgment is
implied. Conversely, several theories entail that judgment
must depend, at least in part, on memory processes (e.g.,
Dougherty, Gettys, & Ogden, 1999; Schwarz, 1998; Tversky
& Kahneman, 1973). The present study contributes to this
debate by addressing two important issues. First, it shows
how more comprehensive memory measures than those used
previously (e.g., Hastie & Park, 1986) are necessary in order
to detect a relationship between memory and retrospective
evaluations. Secondly, it demonstrates how memory strategies
influence the relationship between memory and judgment.
Participants recalled lists of words, after having assessed each of them for their pleasantness. Results showed a clear
association between memory and judgment, which was
mediated by the individual strategies participants used to
recall the items
Now I like it, now I don’t
The present paper tests the widely accepted hypothesis that on-line judgment implies functional independence between memory for, and judgment of, verbal stimuli (e.g., Anderson,1989; Hastie & Park, 1986). In the present study, participants recalled lists of words, after having assessed each for its pleasantness. Presentation position of a negative item within the lists was manipulated. Also, items memorability was manipulated after their presentation – by inserting a filled delay between presentation and the judgment task; in this way, on-line judgment formation was spared. The memory manipulation reduced recall rates for negative items presented in the last position – and their negative influence on pleasantness ratings accordingly. These results contradict the predictions of pure on-line approaches to judgment formation(e.g., Betsch, Plessner, Schwieren, & Gütig, 2001) and suggest that even in on-line judgment tasks, memory plays a role
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