1,107 research outputs found
Experiences of multilingual social workers : trauma therapy in Spanish and English
This exploratory study examines the experiences of social workers engaging in multilingualâSpanish and Englishâtherapy with individuals who speak both Spanish and English, identify as Latino/a, have a history of trauma, and identify as having a history (personal, familial) of immigration to the U.S. The study uses semi-structured interviews with 10 social workers to gather qualitative data about their experiences engaging in trauma therapy with individuals who identify as multilingual as well as Latino/a immigrants to the U.S. The project examines ways that multilingual clinicians process trauma with individuals in more than one language; paying attention to the ways clinicians think about language in therapy, what they observe about transference and countertransference, as well as conceptualize their use of self. An enhanced understanding of clinicians\u27 experiences of engaging in trauma therapy in two languages may support the development of ethical and appropriate services to marginalized newcomers, as well as contribute more information about how to provide high quality services for multilingual individuals and immigrant populations
Extending the generalized Chaplygin gas model by using geometrothermodynamics
We use the formalism of geometrothermodynamics (GTD) to derive fundamental
thermodynamic equations that are used to construct general relativistic
cosmological models. In particular, we show that the simplest possible
fundamental equation, which corresponds in GTD to a system with no internal
thermodynamic interaction, describes the different fluids of the standard model
of cosmology. In addition, a particular fundamental equation with internal
thermodynamic interaction is shown to generate a new cosmological model that
correctly describes the dark sector of the Universe and contains as a special
case the generalized Chaplygin gas model.Comment: 18 pages, 7 figures. Section added: Basics aspects of
geometrothermodynamic
Scaling differences between large interplate and intraplate earthquakes
A study of large intraplate earthquakes with well-determined source parameters shows that these earthquakes obey a scaling law similar to large interplate earthquakes, in which M_0 â L^2 or u = αL, where L is rupture length and u is slip. In contrast to interplate earthquakes, for which α â 1 Ă 10^(â5), for for the intraplate events α â 6 Ă 10^(â5), which implies that these earthquakes have stress drops about 6 times higher than interplate events. This result is independent of focal mechanism type. This implies that intraplate faults have a higher frictional strength than do plate boundaries, and hence that faults are velocity or slip weakening in their behavior. This factor may be important in producing the concentrated deformation that creates and maintains plate boundaries
Needle Tip Force Estimation using an OCT Fiber and a Fused convGRU-CNN Architecture
Needle insertion is common during minimally invasive interventions such as
biopsy or brachytherapy. During soft tissue needle insertion, forces acting at
the needle tip cause tissue deformation and needle deflection. Accurate needle
tip force measurement provides information on needle-tissue interaction and
helps detecting and compensating potential misplacement. For this purpose we
introduce an image-based needle tip force estimation method using an optical
fiber imaging the deformation of an epoxy layer below the needle tip over time.
For calibration and force estimation, we introduce a novel deep learning-based
fused convolutional GRU-CNN model which effectively exploits the
spatio-temporal data structure. The needle is easy to manufacture and our model
achieves a mean absolute error of 1.76 +- 1.5 mN with a cross-correlation
coefficient of 0.9996, clearly outperforming other methods. We test needles
with different materials to demonstrate that the approach can be adapted for
different sensitivities and force ranges. Furthermore, we validate our approach
in an ex-vivo prostate needle insertion scenario.Comment: Accepted for Publication at MICCAI 201
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Quantification of aortic valvuloplasty catheter size using a metrology system based on brightfield microscopy
Balloon aortic valvuloplasty (BAV) has been employed [1] as a simple and low-cost treatment method for patients with severe aortic stenosis, for symptom palliation in patients considered inoperable, for aortic valve replacement and to select the proper transcatheter heart valve (THV) size. During THV implantation choosing the correct balloon size is paramount for minimizing the risks of coronary occlusion, annular damage or THV embolization. Current methods for selecting the proper balloon dimensions are based on transesophageal echocardiography and computed tomography requiring trained staff for image interpretation, expensive equipment and high doses of patient radiation exposure. Alternative methods propose the use of BAV to determine the correct THV size before its implantation [2]. The strategy is based on determining the BAV aortic anulus using a sterile caliper. Any slight pressure to the balloon may compromise the measurement accuracy. In this paper, we present a non-contact metrology system for BAV measurement based on bright field microscopy (BFM). The balloons under test (MedTek-22 and TrueDilation-22) were clamped vertically, employing a tension spring to restrict movement and ensure perpendicularity to the microscope optical axis. The BFM is based on an Olympus PLN 4X WD~18.5mm, NA 0.1, a tube lens (f~180mm) and a FL3-U3- 13S2M-CS camera mounted on top of a custom-made linear stage having a coarse resolution of ~ 3.3”m. Balloon expansion was performed using a Boston scientific Encore 26 inflation device. The balloons are made up of an outer shell with an internal catheter tube (Ă~2mm). By focusing the microscope on the internal tube, then moving the linear stage to refocus on the balloon outer wall, the inner tube to outer wall dimension (see figure inset) can be accurately measured using the linear stage digital readout. The balloon was inflated up to six times recording the pressure and radius at each stage of inflation (twice the amount required for THV). Our non-contact method preserves the catheter sterile conditions and allows the accurate measurement of the BAV anulus showing: a) repeatability of the achieved balloon radius within all the inflation rounds, b) accurate measurements with a standard error of ±200 ”m c) and a variation of 1.38 ±0.0387 mm from the manufacturer data. Knowing the exact balloon dimensions is crucial for avoiding the adverse consequences of THV oversizing. Our method may potentially improve the safety and efficacy of THV implantation
A novel non-invasive biosensor based on electric field detection for cardio-electrophysiology in zebrafish embryos
In this paper we report a novel biosensor based on electric field detection for recording cardiac electrical activity in zebrafish embryos. Using Sussex patented Electric Potential Sensing technology, a portable, non-invasive and cost-effective platform is developed to monitor in vivo electrocardiogram activity from the zebrafish heart. Cardiac activity signals were successfully detected from living zebrafish embryos starting at 3 days-post-fertilizatio
The Ricci flow of asymptotically hyperbolic mass and applications
We consider the evolution of the asymptotically hyperbolic mass under the
curvature-normalized Ricci flow of asymptotically hyperbolic, conformally
compactifiable manifolds. In contrast to asymptotically flat manifolds, for
which ADM mass is constant during Ricci flow, we show that the mass of an
asymptotically hyperbolic manifold of dimension n>2 decays smoothly to zero
exponentially in the flow time. From this, we obtain a no-breathers theorem and
a Ricci flow based, modified proof of the scalar curvature rigidity of
zero-mass asymptotically hyperbolic manifolds. We argue that the nonconstant
time evolution of the asymptotically hyperbolic mass is natural in light of a
conjecture of Horowitz and Myers, and is a test of that conjecture. Finally, we
use a simple parabolic scaling argument to produce a heuristic "derivation" of
the constancy of ADM mass under asymptotically flat Ricci flow, starting from
our decay formula for the asymptotically hyperbolic mass under the
curvature-normalized flow.Comment: Revised in accord with referee comments, typos and minor errors
corrected, Appendix B added, footnotes in-lined; version accepted for
publicatio
The Early Bird Catches The Term: Combining Twitter and News Data For Event Detection and Situational Awareness
Twitter updates now represent an enormous stream of information originating
from a wide variety of formal and informal sources, much of which is relevant
to real-world events. In this paper we adapt existing bio-surveillance
algorithms to detect localised spikes in Twitter activity corresponding to real
events with a high level of confidence. We then develop a methodology to
automatically summarise these events, both by providing the tweets which fully
describe the event and by linking to highly relevant news articles. We apply
our methods to outbreaks of illness and events strongly affecting sentiment. In
both case studies we are able to detect events verifiable by third party
sources and produce high quality summaries
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