1,474 research outputs found

    Mapping Ohio's Compassion

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    This report gives an overview of the state of the nonprofit sector in Ohio

    Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport

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    Using four-dimensional variational analysis, we produce an estimate of the state of a coastal region in Northern Norway during the late winter and spring in 1984. We use satellite sea surface temperature and in situ observations from a series of intensive field campaigns, and obtain a more realistic distribution of water masses both in the horizontal and the vertical than a pure downscaling approach can achieve. Although the distribution of Eulerian surface current speeds are similar, we find that they are more variable and less dependent on model bathymetry in our reanalysis compared to a hindcast produced using the same modeling system. Lagrangian drift currents on the other hand are significantly changed, with overall higher kinetic energy levels in the reanalysis than in the hindcast, particularly in the superinertial frequency band.publishedVersio

    Observational Artifacts of NuSTAR: Ghost Rays and Stray Light

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    The Nuclear Spectroscopic Telescope Array (NuSTAR), launched in June 2012, flies two conical approximation Wolter-I mirrors at the end of a 10.15m mast. The optics are coated with multilayers of Pt/C and W/Si that operate from 3--80 keV. Since the optical path is not shrouded, aperture stops are used to limit the field of view from background and sources outside the field of view. However, there is still a sliver of sky (~1.0--4.0 degrees) where photons may bypass the optics altogether and fall directly on the detector array. We term these photons Stray-light. Additionally, there are also photons that do not undergo the focused double reflections in the optics and we term these Ghost Rays. We present detailed analysis and characterization of these two components and discuss how they impact observations. Finally, we discuss how they could have been prevented and should be in future observatories.Comment: Published in Journal of Astronomical Telescopes, Instruments, and Systems. Open Access. http://dx.doi.org/10.1117/1.JATIS.3.4.04400

    Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array

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    The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, d_i = a/(b + i)^c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, d_(max). The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis

    Investigating Managerial Qualities to Support Sustainable Intervention Effects in the Long Term

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    It is crucial to understand how interventions can be designed and implemented in order to support successful and sustainable effects in the long term. Intervention management can be important in this regard, but we have limited knowledge on the managerial strategies that can help to sustain the effects of an intervention over time. In this paper, we present a qualitative study of an intervention that had a duration of five years. We carried out 11 in-depth interviews on the role and qualities of the manager in the intervention process and effects. Results from the intervention unit showed that an engaged line manager was essential for promoting employee motivation and involvement in the longer term, which was achieved through building empowerment and trust, establishing a work group, and use of some support by external consultants. In conclusion, this intervention indicated that building good intervention management is important for sustainable intervention effects

    Conformational Entropy as a Means to Control the Behavior of Poly(diketoenamine) Vitrimers In and Out of Equilibrium.

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    Control of equilibrium and non-equilibrium thermomechanical behavior of poly(diketoenamine) vitrimers is shown by incorporating linear polymer segments varying in molecular weight (MW) and conformational degrees of freedom into the dynamic covalent network. While increasing MW of linear segments yields a lower storage modulus at the rubbery plateau after softening above the glass transition (Tg ), both Tg and the characteristic time of stress relaxation are independently governed by the conformational entropy of the embodied linear segments. Activation energies for bond exchange in the solid state are lower for networks incorporating flexible chains; the network topology freezing temperature decreases with increasing MW of flexible linear segments but increases with increasing MW of stiff segments. Vitrimer reconfigurability is therefore influenced not only by the energetics of bond exchange for a given network density, but also the entropy of polymer chains within the network

    Rapid Implementation of Telerehabilitation for Pediatric Patients During COVID-19

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    The COVID-19 pandemic necessitated a sudden limitation of in-person outpatient occupational and physical therapy services for most patients at a large, multisite pediatric hospital located in the Midwest, United States.  To ensure patient and staff safety, the hospital rapidly shifted to deliver most of these services via telerehabilitation. The purposes of this study were to (1) describe the rapid implementation of telerehabilitation during the COVID-19 pandemic, (2) describe the demographic characteristics of patients who continued in-person services and those who received telerehabilitation, and (3) evaluate the therapists’ perceptions of telerehabilitation for physical and occupational therapy. Most of the children (83.4% of n=1352) received telerehabilitation services. A family was more likely to choose to continue in-person visits if their child was <1-year-old, had a diagnosis of torticollis, received serial casting, or was post-surgical. Occupational and physical therapy therapists (n=9) completed surveys to discern their perceptions of the acceptability of telerehabilitation, with most reporting that telerehabilitation was as effective as in-person care. &nbsp
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