42,505 research outputs found
Passive harmonic mode-locking by mode selection in Fabry-Perot diode lasers with patterned effective index
We demonstrate passive harmonic mode-locking of a quantum well laser diode
designed to support a discrete comb of Fabry-Perot modes. Spectral filtering of
the mode spectrum was achieved using a non-periodic patterning of the cavity
effective index. By selecting six modes spaced at twice the fundamental mode
spacing, near-transform limited pulsed output with 2 ps pulse duration was
obtained at a repetition rate of 100 GHz.Comment: 3 page
On the road: the action learning set (ALS) journey towards becoming a research-engaged school
"The full report explores from a leadership perspective one approach to setting up research communities within a school – the implementation of a formal approach to action research in a large, challenging inner-city comprehensive school through the use of action learning sets (ALS), sometimes known in educational literature as ‘professional learning communities’." - Page 2
Two species of Compsus Schoenherr, new citrus pests from Colombia (Coleoptera: Curculionidae: Entiminae)
Two species of the weevil genus Compsus Schoenherr (Coleoptera: Curculionidae: Entiminae) from Colombia are redescribed: C. obliquatus Hustache and C.viridivittatus (Guérin-Méneville). A key by Hustache in 1938, to 33 of the 34 recognized species of Colombian Compsus then known, is modified to include the one additional species. Habitus illustrations of males and females of the two species and illustrations of selected parts of the male and female genitalia are included. Nearly all of the specimens of these two species were collected on various species or varieties of citrus, indicating their potential as citrus pests in the future.Se redescriben dos especies de picudos del genero Compsus Schoenherr (Coleoptera: Curculionidae: Entiminae) colectadas en Colombia: C. obliquatus Hustache y C. viridivittatus (Guérin-Méneville). Se modifica la clave de identificación de Hustache de 1938 la cual incluye 33 a 34 especies conocidas de Compsus en ese entonces en Colombia. Se incluyen ilustraciones con las características físicas de machos y hembras de ambas especies e
ilustraciones de partes seleccionadas de la genitalia de machos y hembras de las dos especies. Casi todos los especímenes de estas dos especies fueron colectadas en varias especies o variedades de cítricos, lo cual indica su futuro potencial como plagas de cítricos
All-optical switching in metamaterial with high structural symmetry
We argue the possibility of realization of a polarization insensitive
all-optical switching in a planar metamaterial composed of a 4-fold periodic
array of two concentric metal rings placed on a substrate of nonlinear
material. It is demonstrated that a switching may be achieved between
essentially different values of transmission near the resonant frequency of the
high-quality-factor Fano-shape trapped-mode excitation.Comment: 7 pages, 3 figure
Macromia alleghaniensis (Odonata: Macromiidae): New For Michigan, with Clarifications of Northern Records
An Alleghany River Cruiser, Macromia alleghaniensis Williamson (Odonata: Macromiidae), collected in Cass County, Michigan on 18 June 2014, represents the first record of the species for the state, as well as the northernmost unequivocal record in North America. Other records north of 40° latitude are clarified and discussed
Seeing is believing: How people fail to identify fake images on the web
The growing ease with which digital images can be convincingly manipulated and widely distributed on the Internet makes viewers increasingly susceptible to visual misinformation and deception. In situations where ill-intentioned individuals seek to deliberately mislead and influence viewers through fake online images, the harmful consequences could be substantial. We describe an exploratory study of how individuals react, respond to, and evaluate the authenticity of images that accompany online stories in Internet-enabled communications channels. Our preliminary findings support the assertion that people perform poorly at detecting skillful image manipulation, and that they often fail to question the authenticity of images even when primed regarding image forgery through discussion. We found that viewers make credibility evaluation based mainly on non-image cues rather than the content depicted. Moreover, our study revealed that in cases where context leads to suspicion, viewers apply post-hoc analysis to support their suspicions regarding the authenticity of the image
All-optical memory based on the injection locking bistability of a two-color laser diode
We study the injection locking bistability of a specially engineered
two-color semiconductor Fabry-Perot laser. Oscillation in the uninjected
primary mode leads to a bistability of single mode and two-color equilibria.
With pulsed modulation of the injected power we demonstrate an all-optical
memory element based on this bistability, where the uninjected primary mode is
switched with 35 dB intensity contrast. Using experimental and theoretical
analysis, we describe the associated bifurcation structure, which is not found
in single mode systems with optical injection.Comment: 5 pages, 5 figure
Neurodiversity Affirming Goal Writing
Introduction: The rise of the neurodiversity movement has started to question social communication and pragmatic therapy as we know it today. This movement started in the 1990s when Autistic people were able to connect and share ideas in online forums. These groups went on to create a social-justice movement for Autistic self-advocacy along with their own Autistic culture. This community has pointed out that some forms of pragmatic therapy can promote masking. Method: A review of the published literature and lived experiences via blogs using search terms such as “neurodiversity” and “neurodiverse response to social communication therapy” was completed to better understand this movement. A total number of 12 articles were reviewed. Results: By creating goals that are neurodivergent affirming and strength-based this can lead to greater motivation and communication successes, reduced behaviors, and help teach self-advocacy for clients with Autistic clients.https://griffinshare.fontbonne.edu/slp-posters-2023/1035/thumbnail.jp
Towards predicting post-editing productivity
Machine translation (MT) quality is generally measured via automatic metrics, producing scores that have no meaning for translators who are required to post-edit MT output or for project managers who have to plan and budget for transla- tion projects. This paper investigates correlations between two such automatic metrics (general text matcher and translation edit rate) and post-editing productivity. For the purposes of this paper, productivity is measured via processing speed and cognitive measures of effort using eye tracking as a tool. Processing speed, average fixation time and count are found to correlate well with the scores for groups of segments. Segments with high GTM and TER scores require substantially less time and cognitive effort than medium or low-scoring segments. Future research involving score thresholds and confidence estimation is suggested
On the origin of radio core emission in radio-quiet quasars
We present a model for the radio emission from radio-quiet quasar nuclei. We
show that a thermal origin for the high brightness temperature, flat spectrum
point sources (known as radio ``cores'') is possible provided the emitting
region is hot and optically-thin. We hence demonstrate that optically-thin
bremsstrahlung from a slow, dense disk wind can make a significant contribution
to the observed levels of radio core emission. This is a much more satisfactory
explanation, particularly for sources where there is no evidence of a jet, than
a sequence of self-absorbed synchrotron components which collectively conspire
to give a flat spectrum. Furthermore, such core phenomena are already observed
directly via milli-arcsecond radio imaging of the Galactic microquasar SS433
and the active galaxy NGC1068. We contend that radio-emitting disk winds must
be operating at some level in radio-loud quasars and radio galaxies as well
(although in these cases, observations of the radio cores are frequently
contaminated/dominated by synchrotron emission from jet knots). This
interpretation of radio core emission mandates mass accretion rates that are
substantially higher than Eddington. Moreover, acknowledgment of this mass-loss
mechanism as an AGN feedback process has important implications for the input
of energy and hot gas into the inter-galactic medium (IGM) since it is
considerably less directional than that from jets.Comment: to appear in ApJ Letters (4 pages
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