10,402 research outputs found
TIGS: An Inference Algorithm for Text Infilling with Gradient Search
Text infilling is defined as a task for filling in the missing part of a
sentence or paragraph, which is suitable for many real-world natural language
generation scenarios. However, given a well-trained sequential generative
model, generating missing symbols conditioned on the context is challenging for
existing greedy approximate inference algorithms. In this paper, we propose an
iterative inference algorithm based on gradient search, which is the first
inference algorithm that can be broadly applied to any neural sequence
generative models for text infilling tasks. We compare the proposed method with
strong baselines on three text infilling tasks with various mask ratios and
different mask strategies. The results show that our proposed method is
effective and efficient for fill-in-the-blank tasks, consistently outperforming
all baselines.Comment: The 57th Annual Meeting of the Association for Computational
Linguistics (ACL 2019
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Field responsive mechanical metamaterials.
Typically, mechanical metamaterial properties are programmed and set when the architecture is designed and constructed, and do not change in response to shifting environmental conditions or application requirements. We present a new class of architected materials called field responsive mechanical metamaterials (FRMMs) that exhibit dynamic control and on-the-fly tunability enabled by careful design and selection of both material composition and architecture. To demonstrate the FRMM concept, we print complex structures composed of polymeric tubes infilled with magnetorheological fluid suspensions. Modulating remotely applied magnetic fields results in rapid, reversible, and sizable changes of the effective stiffness of our metamaterial motifs
Correlations between Optical Properties and Voronoi-Cell Area of Quantum Dots
A semiconductor quantum dot (QD) can generate highly indistinguishable
single-photons at a high rate. For application in quantum communication and
integration in hybrid systems, control of the QD optical properties is
essential. Understanding the connection between the optical properties of a QD
and the growth process is therefore important. Here, we show for GaAs QDs,
grown by infilling droplet-etched nano-holes, that the emission wavelength, the
neutral-to-charged exciton splitting, and the diamagnetic shift are strongly
correlated with the capture zone-area, an important concept from nucleation
theory. We show that the capture-zone model applies to the growth of this
system even in the limit of a low QD-density in which atoms diffuse over
m-distances. The strong correlations between the various QD parameters
facilitate preselection of QDs for applications with specific requirements on
the QD properties; they also suggest that a spectrally narrowed QD distribution
will result if QD growth on a regular lattice can be achieved
Using digital and hand printing techniques to compensate for loss: re-establishing colour and texture in historic textiles
Conservators use a range of 'gap filling' techniques to improve the structural stability and presentation of objects. Textile conservators often use fabric supports to provide reinforcement for weak areas of a textile and to provide a visual infill in missing areas. The most common technique is to use dyed fabrics of a single colour but while a plain dyed support provides good reinforcement, it can be visually obtrusive when used with patterned or textured textiles. Two recent postgraduate dissertation projects at the Textile Conservation Centre (TCC) have experimented with hand printing and digital imaging techniques to alter the appearance of support fabrics so that they are less visually obtrusive and blend well with the colour and texture of the textile being supported. Case studies demonstrate the successful use of these techniques on a painted hessian rocking horse and a knitted glove from an archaeological context
Mercury's geochronology revised by applying Model Production Functions to Mariner 10 data: geological implications
Model Production Function chronology uses dynamic models of the Main Belt
Asteroids (MBAs) and Near Earth Objects (NEOs) to derive the impactor flux to a
target body. This is converted into the crater size-frequency-distribution for
a specific planetary surface, and calibrated using the radiometric ages of
different regions of the Moon's surface. This new approach has been applied to
the crater counts on Mariner 10 images of the highlands and of several large
impact basins on Mercury. MPF estimates for the plains show younger ages than
those of previous chronologies. Assuming a variable uppermost layering of the
Hermean crust, the age of the Caloris interior plains may be as young as 3.59
Ga, in agreement with MESSENGER results that imply that long-term volcanism
overcame contractional tectonics. The MPF chronology also suggests a variable
projectile flux through time, coherent with the MBAs for ancient periods and
then gradually comparable also to the NEOs.Comment: Accepted by Journal Geophysical Research Letter
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