841 research outputs found
From Data to Narratives: Scrutinising the Spatial Dimensions of Social and Cultural Phenomena Through Lenses of Interactive Web Mapping
Modern web mapping techniques have enhanced the storytelling capability of cartography. In this paper, we present our recent development of a web mapping facility that can be used to extract interesting stories and unique insights from a diverse range of socio-economic and demographic variables and indicators, derived from a variety of datasets. We then use three curated narratives to show that online maps are effective ways of interactive storytelling and visualisation, which allow users to tailor their own story maps. We discuss the reasons for the revival of the recent attention to narrative mapping and conclude that our interactive web mapping facility powered by data assets can be employed as an accessible and powerful toolkit, to identify geographic patterns of various social and economic phenomena by social scientists, journalists, policymakers, and the public
Motion of Contact Line of a Crystal Over the Edge of Solid Mask in Epitaxial Lateral Overgrowth
Mathematical model that allows for direct tracking of the homoepitaxial
crystal growth out of the window etched in the solid, pre-deposited layer on
the substrate is described. The growth is governed by the normal (to the
crystal-vapor interface) flux from the vapor phase and by the interface
diffusion. The model accounts for possibly inhomogeneous energy of the mask
surface and for strong anisotropies of crystal-vapor interfacial energy and
kinetic mobility. Results demonstrate that the motion of the crystal-mask
contact line slows down abruptly as radius of curvature of the mask edge
approaches zero. Numerical procedure is suggested to overcome difficulties
associated with ill-posedness of the evolution problem for the interface with
strong energy anisotropy.
Keywords: Thin films, epitaxy, MOCVD, surface diffusion, interface dynamics,
contact lines, rough surfaces, wetting, regularization of ill-posed evolution
problems.Comment: 21 pages, 11 figures; to appear in Computational Materials Scienc
Cis-effects on gene expression in the human prenatal brain associated with genetic risk for neuropsychiatric disorders
The majority of common risk alleles identified for neuropsychiatric disorders reside in non-coding regions of the genome and are therefore likely to impact gene regulation. However, the genes that are primarily affected and the nature and developmental timing of these effects remain unclear. Given the hypothesised role for early neurodevelopmental processes in these conditions, we here define genetic predictors of gene expression in the human fetal brain with which we perform transcriptome-wide association studies (TWASs) of attention deficit hyperactivity disorder (ADHD), autism spectrum disorder, bipolar disorder, major depressive disorder and schizophrenia. We identify prenatal cis-regulatory effects on 63 genes and 166 individual transcripts associated with genetic risk for these conditions. We observe pleiotropic effects of expression predictors for a number of genes and transcripts, including those of decreased DDHD2 expression in association with risk for schizophrenia and bipolar disorder, increased expression of a ST3GAL3 transcript with risk for schizophrenia and ADHD, and increased expression of an XPNPEP3 transcript with risk for schizophrenia, bipolar disorder and major depression. For the protocadherin alpha cluster genes PCDHA7 and PCDHA8, we find that predictors of low expression are associated with risk for major depressive disorder while those of higher expression are associated with risk for schizophrenia. Our findings support a role for altered gene regulation in the prenatal brain in susceptibility to various neuropsychiatric disorders and prioritize potential risk genes for further neurobiological investigation
On the dynamics of planetesimals embedded in turbulent protoplanetary discs
(abridged) Angular momentum transport and accretion in protoplanetary discs
are generally believed to be driven by MHD turbulence via the
magneto-rotational instability (MRI). The dynamics of solid bodies embedded in
such discs (dust grains, boulders, planetesimals and planets) may be strongly
affected by the turbulence, such that the formation pathways for planetary
systems are determined in part by the strength and spatial distribution of the
turbulent flow.
We examine the dynamics of planetesimals, with radii between 1m \^a 10 km,
embedded in turbulent protoplanetary discs, using three dimensional MHD
simulations. The planetesimals experience gas drag and stochastic gravitational
forces due to the turbulent disc. We use, and compare the results from, local
shearing box simulations and global models in this study.
The main aims of this work are to examine: the growth, and possible
saturation, of the velocity dispersion of embedded planetesimals as a function
of their size and disc parameters; the rate of radial migration and diffusion
of planetesimals; the conditions under which the results from shearing box and
global simulations agree.
We find good agreement between local and global simulations when shearing
boxes of dimension 4H x 16H x 2H are used (H being the local scale height). The
magnitude of the density fluctuations obtained is sensitive to the box size,
due to the excitation and propagation of spiral density waves. This affects the
stochastic forcing experienced by planetesimals. [...]
Our models show that fully developed MHD turbulence in protoplanetary discs
would have a destructive effect on embedded planetesimals. Relatively low
levels of turbulence are required for traditional models of planetesimal
accretion to operate, this being consistent with the existence of a dead zone
in protoplanetary discs.Comment: 23 pages, 28 figures, 3 tables, accepted for publication in MNRA
Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2022 UWTV Survey Report and catch scenarios for 2023
This report provides the main results and findings of the 21st annual underwater television survey on the Aran, Galway Bay and Slyne head Nephrops grounds, ICES assessment area; Functional Unit 17. In 2022, due to disruption to the survey schedule caused by weather downtime, the UWTV survey could not complete the Aran Grounds and Slyne Head stations, and was only able to complete successfully the 5 Galway Bay stations. The survey was multi-disciplinary in nature collecting UWTV, CTD and other ecosystem data. The mean burrow density observed in Galway Bay, adjusted for edge effect, was 0.19 burrows/m2; and the final abundance estimate for this ground was 15 million burrows with a CV (Coefficient of Variance; relative standard error) of 3%. There were no sea-pen species nor trawl marks observed in the footage from Galway Bay. The 2022 UWTV survey was not deemed robust enough to derive fishing advice for 2023 owing to the reduced number of stations. As such, the stock size is considered unknown for 2022. Therefore, the assessment and catch advice for 2023 is based on the 2021 UWTV survey. The 2021 combined abundance estimate (331 million burrows) was below the MSY Btrigger reference (540 million burrows). Using the 2021 estimate of abundance and updated stock data imply that catches in 2023 should be no more than 363 tonnes, according to the EU MAP and ICES MSY approach and assuming that discard rates and fishery selection patterns do not change from the average of 2019–2021
Multimode interferometry for entangling atoms in quantum networks
© 2019 IOP Publishing Ltd. We bring together a cavity-enhanced light-matter interface with a multimode interferometer (MMI) integrated onto a photonic chip and demonstrate the potential of such hybrid systems to tailor distributed entanglement in a quantum network. The MMI is operated with pairs of narrowband photons produced a priori deterministically from a single 87Rb atom strongly coupled to a high-finesse optical cavity. Non-classical coincidences between photon detection events show no loss of coherence when interfering pairs of these photons through the MMI in comparison to the two-photon visibility directly measured using Hong-Ou-Mandel interference on a beam splitter. This demonstrates the ability of integrated multimode circuits to mediate the entanglement of remote stationary nodes in a quantum network interlinked by photonic qubits
On the dynamics of planetesimals embedded in turbulent protoplanetary discs with dead zones
(abridged) Accretion in protoplanetary discs is thought to be driven by [...]
turbulence via the magnetorotational instability (MRI). Recent work has shown
that a planetesimal swarm embedded in a fully turbulent disc is subject to
strong excitation of the velocity dispersion, leading to collisional
destruction of bodies with radii R_p < 100 km. Significant diffusion of
planetesimal semimajor axes also arises, leading to large-scale spreading of
the planetesimal population throughout the inner regions of the protoplanetary
disc, in apparent contradiction of constraints provided by the distribution of
asteroids within the asteroid belt. In this paper, we examine the dynamics of
planetesimals embedded in vertically stratified turbulent discs, with and
without dead zones. Our main aims are to examine the turbulent excitation of
the velocity dispersion, and the radial diffusion, of planetesimals in these
discs. We employ three dimensional MHD simulations [...], along with an
equilibrium chemistry model [...] We find that planetesimals in fully turbulent
discs develop large random velocities that will lead to collisional
destruction/erosion for bodies with sizes below 100 km, and undergo radial
diffusion on a scale \sim 2.5 au over a 5 Myr disc life time. But planetesimals
in a dead zone experience a much reduced excitation of their random velocities,
and equilibrium velocity dispersions lie between the disruption thresholds for
weak and strong aggregates for sizes R_p < 100 km. We also find that radial
diffusion occurs over a much reduced length scale \sim 0.25 au over the disc
life time, this being consistent with solar system constraints. We conclude
that planetesimal growth via mutual collisions between smaller bodies cannot
occur in a fully turbulent disc. By contrast, a dead zone may provide a safe
haven in which km-sized planetesimals can avoid mutual destruction through
collisions.Comment: 18 pages, 13 figures, 3 tables, MNRAS in press, minor corrections to
match the published versio
Stroke Ready: a multi-level program that combines implementation science and community-based participatory research approaches to increase acute stroke treatment: protocol for a stepped wedge trial
Abstract
Background
Post-stroke disability is common, costly, and projected to increase. Acute stroke treatments can substantially reduce post-stroke disability, but few patients take advantage of these cost-effective treatments. Practical, cost-efficient, and sustainable interventions to address underutilized acute stroke treatments are currently lacking. In this context, we present the Stroke Ready project, a stepped wedge design, multi-level intervention that combines implementation science and community-based participatory research approaches to increase acute stroke treatments in the predominately African American community of Flint, Michigan, USA.
Methods
Guided by the Tailored Implementation of Chronic Disease (TICD) framework, we begin with optimization of acute stroke care in emergency departments, with particular attention given to our safety-net hospital partners. Then, we move to a community-wide, multi-faceted, stroke preparedness intervention, with workshops led by peer educators, over 2Â years. Measures of engagement of the safety-net hospital and the feasibility and sustainability of the implementation strategy as well as community intervention reach, dose delivered, and satisfaction will be collected. The primary outcome is acute stroke treatment rates, which includes both intravenous tissue plasminogen activator, and endovascular treatment. The co-secondary outcomes are intravenous tissue plasminogen activator treatment rates and the proportion of stroke patients who arrive by ambulance.
Discussion
If successful, Stroke Ready will increase acute stroke treatment rates through emergency department and community level interventions. The stepped wedge design and process evaluation will provide insight into how Stroke Ready works and where it might work best. By exploring the relative effectiveness of the emergency department optimization and the community intervention, we will inform hospitals and communities as they determine how best to use their resources to optimize acute stroke care.
Trial registration
ClinicalTrials.gov
Trial Identifier
NCT03645590
.https://deepblue.lib.umich.edu/bitstream/2027.42/148211/1/13012_2019_Article_869.pd
A novel genetic variant of Streptococcus pneumoniae serotype 11A discovered in Fiji.
OBJECTIVES: As part of annual cross-sectional Streptococcus pneumoniae carriage surveys in Fiji (2012-2015), we detected pneumococci in over 100 nasopharyngeal swabs that serotyped as '11F-like' by microarray. We examined the genetic basis of this divergence in the 11F-like capsular polysaccharide (cps) locus compared to the reference 11F cps sequence. The impact of this diversity on capsule phenotype, and serotype results using genetic and serologic methods were determined. METHODS: Genomic DNA from representative 11F-like S. pneumoniae isolates obtained from the nasopharynx of Fijian children was extracted and subject to whole genome sequencing. Genetic and phylogenetic analyses were used to identify genetic changes in the cps locus. Capsular phenotypes were evaluated using the Quellung reaction and latex agglutination. RESULTS: Compared to published 11F sequences, the wcwC and wcrL genes of the 11F-like cps locus are phylogenetically divergent, and the gct gene contains a single nucleotide insertion within a homopolymeric region. These changes within the DNA sequence of the 11F-like cps locus have modified the antigenic properties of the capsule, such that 11F-like isolates serotype as 11A by Quellung reaction and latex agglutination. CONCLUSIONS: This study demonstrates the ability of molecular serotyping by microarray to identify genetic variants of S. pneumoniae and highlights the potential for discrepant results between phenotypic and genotypic serotyping methods. We propose that 11F-like isolates are not a new serotype but rather are a novel genetic variant of serotype 11A. These findings have implications for invasive pneumococcal disease surveillance as well as studies investigating vaccine impact
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