6,364 research outputs found
Interactive digital signal processor
The Interactive Digital Signal Processor (IDSP) is examined. It consists of a set of time series analysis Operators each of which operates on an input file to produce an output file. The operators can be executed in any order that makes sense and recursively, if desired. The operators are the various algorithms used in digital time series analysis work. User written operators can be easily interfaced to the sysatem. The system can be operated both interactively and in batch mode. In IDSP a file can consist of up to n (currently n=8) simultaneous time series. IDSP currently includes over thirty standard operators that range from Fourier transform operations, design and application of digital filters, eigenvalue analysis, to operators that provide graphical output, allow batch operation, editing and display information
Excitation Enhancement of a Quantum Dot Coupled to a Plasmonic Antenna
Plasmonic antennas are key elements to control the luminescence of quantum
emitters. However, the antenna's influence is often hidden by quenching losses.
Here, the luminescence of a quantum dot coupled to a gold dimer antenna is
investigated. Detailed analysis of the multiply excited states quantifies the
antenna's influence on the excitation intensity and the luminescence quantum
yield separately
Distributed leadership, trust and online communities
This paper analyses the role of distributed leadership and trust in online communities. The team-based informal ethos of online collaboration requires a different kind of leadership from that in formal positional hierarchies. Such leadership may be more flexible and sophisticated, capable of encompassing ambiguity and rapid change. Online leaders need to be partially invisible, delegating power and distributing tasks. Yet, simultaneously, online communities are facilitated by the high visibility and subtle control of expert leaders. This paradox: that leaders need to be both highly visible and invisible as appropriate, was derived from prior research and tested in the analysis of online community discussions using a pattern-matching process. It is argued that both leader visibility and invisibility are important for the facilitation of trusting collaboration via distributed leadership. Advanced leadership responses to complex situations in online communities foster positive group interaction and decision-making, facilitated through active distribution of specific tasks
Context-dependent Neural Responses to Minor Notes in Frontal and Temporal Regions Distinguish Musicians from Nonmusicians
Musical training is required for individuals to correctly label musical modes using the terms âmajorâ and âminor,â whereas no training is required to label these modes as âhappyâ or âsad.â Despite the high accuracy of nonmusicians in happy/sad labeling,previous research suggests that these individuals may exhibit differences in the neural response to the critical noteâthe note (the third of the relevant key) that defines a melody as major or minor. The current study replicates the presence of a late positive component (LPC) to the minor melody in musicians only. Importantly, we also extend this finding to examine additional neural correlates of critical notes in a melody. Although there was no evidence of an LPC response to a second occurrence of the critical note in either group, there was a strong early right anterior negativity response in the inferior frontal gyrus in musicians in response to the first critical note in the minor mode. This response was sufficient to classify participants based on their musical training group. Furthermore, there were no differences in prefrontal asymmetry in the alpha or beta bands during the critical notes. These findings support the hypothesis thatmusical training may enhance the neural response to the information content of critical note in a minor scale but not the neural response to the emotional content of a melody
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass
We present results on the light, strange and charm nucleon scalar and tensor
charges from lattice QCD, using simulations with flavors of twisted
mass Clover-improved fermions with a physical value of the pion mass. Both
connected and disconnected contributions are included, enabling us to extract
the isoscalar, strange and charm charges for the first time directly at the
physical point. Furthermore, the renormalization is computed non-perturbatively
for both isovector and isoscalar quantities. We investigate excited state
effects by analyzing several sink-source time separations and by employing a
set of methods to probe ground state dominance. Our final results for the
scalar charges are , ,
, and for the tensor charges
, ,
, in the scheme at 2~GeV. The first error is statistical, the second is the
systematic error due to the renormalization and the third the systematic
arising from possible contamination due to the excited states.Comment: 20 pages and 13 figure
Non-classicality of photon added coherent and thermal radiations
Production and analysis of non-Gaussian radiation fields has evinced a lot of
attention recently. Simplest way of generating such non-Gaussians is through
adding (subtracting) photons to Gaussian fields. Interestingly, when photons
are added to classical Gaussian fields, the resulting states exhibit {\em
non-classicality}. Two important classical Gaussian radiation fields are
coherent and thermal states. Here, we study the non-classical features of such
states when photons are added to them. Non-classicality of these states shows
up in the negativity of the Wigner function. We also work out the {\em
entanglement potential}, a recently proposed measure of non-classicality for
these states. Our analysis reveals that photon added coherent states are
non-classical for all seed beam intensities; their non-classicality increases
with the addition of more number of photons. Thermal state exhibits
non-classicality at all temperatures, when a photon is added; lower the
temperature, higher is their non-classicality.Comment: Version 2, minor revision; new references added, to appear in Eur.
Phys. J. D, 6 pages, 10 figure ps files, RevTe
Not all features are created equal: Processing asymmetries between location and object features
Previous research has shown spontaneous location processing when location is not a task relevant feature
and when a target is presented together with distractors. The present study investigates whether such
processing can occur in the absence of distractor inhibition, and whether there is a processing asymmetry
between location and an object feature. The results show that not all features are created equal. Whereas
attending to an objectâs color or texture led to the involuntary processing of that objectâs location, attending
to an objectâs location did not necessarily result in the encoding of its color or texture when these
nonspatial properties were not task relevant. These results add to the body of evidence demonstrating
the special role of location in attentional selection. They also provide a clearer picture of the interactions
among location, object features, and participantsâ behavioral goals
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Identification of candidate genes affecting Delta9-tetrahydrocannabinol biosynthesis in Cannabis sativa.
RNA isolated from the glands of a Delta(9)-tetrahydrocannabinolic acid (THCA)-producing strain of Cannabis sativa was used to generate a cDNA library containing over 100 000 expressed sequence tags (ESTs). Sequencing of over 2000 clones from the library resulted in the identification of over 1000 unigenes. Candidate genes for almost every step in the biochemical pathways leading from primary metabolites to THCA were identified. Quantitative PCR analysis suggested that many of the pathway genes are preferentially expressed in the glands. Hexanoyl-CoA, one of the metabolites required for THCA synthesis, could be made via either de novo fatty acids synthesis or via the breakdown of existing lipids. qPCR analysis supported the de novo pathway. Many of the ESTs encode transcription factors and two putative MYB genes were identified that were preferentially expressed in glands. Given the similarity of the Cannabis MYB genes to those in other species with known functions, these Cannabis MYBs may play roles in regulating gland development and THCA synthesis. Three candidates for the polyketide synthase (PKS) gene responsible for the first committed step in the pathway to THCA were characterized in more detail. One of these was identical to a previously reported chalcone synthase (CHS) and was found to have CHS activity. All three could use malonyl-CoA and hexanoyl-CoA as substrates, including the CHS, but reaction conditions were not identified that allowed for the production of olivetolic acid (the proposed product of the PKS activity needed for THCA synthesis). One of the PKS candidates was highly and specifically expressed in glands (relative to whole leaves) and, on the basis of these expression data, it is proposed to be the most likely PKS responsible for olivetolic acid synthesis in Cannabis glands
Managing systemic change: future roles for social learning systems and communities of practice?
The âBlueprintâ framework for career management skills: a critical exploration
This article examines the Blueprint framework for career management skills as it has been revealed across sequential implementations in the USA, Canada and Australia. It is argued that despite its lack of an empirical basis, the framework forms a useful and innovative means through which career theory, practice and policy can be connected. The framework comprises both core elements (learning areas, learning model and levels) and contextual elements (resources, community of practice, service delivery approach and policy connection). Each of these elements is explored
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