1,176 research outputs found
An Adaptive Task-Related Component Analysis Method for SSVEP recognition
Steady-state visual evoked potential (SSVEP) recognition methods are equipped
with learning from the subject's calibration data, and they can achieve extra
high performance in the SSVEP-based brain-computer interfaces (BCIs), however
their performance deteriorate drastically if the calibration trials are
insufficient. This study develops a new method to learn from limited
calibration data and it proposes and evaluates a novel adaptive data-driven
spatial filtering approach for enhancing SSVEPs detection. The spatial filter
learned from each stimulus utilizes temporal information from the corresponding
EEG trials. To introduce the temporal information into the overall procedure,
an multitask learning approach, based on the bayesian framework, is adopted.
The performance of the proposed method was evaluated into two publicly
available benchmark datasets, and the results demonstrated that our method
outperform competing methods by a significant margin.Comment: 23 pages, 3 Figures, 6 Table
Impacts of energy efficiency retrofitting measures on indoor PM concentrations across different income groups in England: a modelling study
As part of an effort to reduce carbon emissions in the UK, policies encouraging the energy-efficient retrofit of domestic properties are being implemented. Typical retrofits, including installation of insulation and double glazing can cause tightening of the building envelope which may affect indoor air quality (IAQ) impacting occupant health. Using the example of PM (an airborne pollutant with known health impacts), this study considers the influence of energy-efficient retrofits on indoor PM concentrations in domestic properties both above and below the low-income threshold (LIT) for a range of tenancies across England. Simulations using EnergyPlus and its integrated Generic Contaminant model are employed to predict indoor PM exposures from both indoor and outdoor sources in building archetypes representative of (i) the existing housing stock and (ii) a retrofitted English housing stock. The exposures of occupants for buildings occupied by groups above and below the LIT are then estimated under current conditions and following retrofits. One-way ANOVA tests were applied to clarify results and investigate differences between the various income and tenure groups. Results indicate that all tenures below the LIT experience greater indoor PM concentrations than those above, suggesting possible social inequalities driven by housing, leading to consequences for health
Colour-Flavour Locked Quark Stars in Light of the Compact Object in HESS J1731-347 and the GW190814 Event
The central compact object within HESS J1731- 347 possesses unique mass and
radius properties that renders it a compelling candidate for a self-bound star.
In this research, we examine the capability of quark stars composed of colour
superconducting quark matter to explain the latter object by using its
marginalised posterior distribution and imposing it as a constraint on the
relevant parameter space. Namely, we investigate quark matter for in
the colour superconducting phase, incorporating perturbative QCD corrections,
and we derive their properties accordingly. The utilised thermodynamic
potential of this work possesses an MIT bag model formalism with the parameters
being established as flavour-independent. In this instance, we conclude the
favour of 3-flavour over 2-flavour colour superconducting quark matter,
isolating our interest on the former. The parameter space is further confined
due to the additional requirement for a high maximum mass (), accounting for GW's secondary companion. We pay a
significant attention on the speed of sound and the trace anomaly (proposed as
a measure of conformality
[\href{https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.252702}{10.1103/PhysRevLett.129.252702}]).
We conclude that it is possible for colour-flavour locked quark stars to reach
high masses without violating the conformal bound or the if the quartic coefficient value does not
exceed an upper limit which is solely dependent on the established
. For , we find that the limit
reads . Lastly, a further study takes place on the
agreement of colour-flavour locked quark stars with additional astrophysical
objects including the GW and GW events, followed by a relevant
discussion.Comment: 13 pages, 10 figures, 1 tabl
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