2,856 research outputs found

    Pre-processing of Wallops Station AN/FPQ-6 GEOS 2 data

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    Preprocessing, operation, and calibration procedures for Wallops radar syste

    Frequency shift of hyperfine transitions due to blackbody radiation

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    We have performed calculations of the size of the frequency shift induced by a static electric field on the clock transition frequencies of the hyperfine splitting in Yb+, Rb, Cs, Ba+, and Hg+. The calculations are used to find the frequency shifts due to blackbody radiation which are needed for accurate frequency measurements and improvements of the limits on variation of the fine structure constant, alpha. Our result for Cs (delta nu E^2=-2.26 times 10^{-10}Hz/(V/m)^2) is in good agreement with early measurements and ab initio calculations. We present arguments against recent claims that the actual value might be smaller. The difference (approx 10%) is due to the contribution of the continuum spectrum in the sum over intermediate states.Comment: Added discussion of Cs results and reference

    Negative phase time for Scattering at Quantum Wells: A Microwave Analogy Experiment

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    If a quantum mechanical particle is scattered by a potential well, the wave function of the particle can propagate with negative phase time. Due to the analogy of the Schr\"odinger and the Helmholtz equation this phenomenon is expected to be observable for electromagnetic wave propagation. Experimental data of electromagnetic wells realized by wave guides filled with different dielectrics confirm this conjecture now.Comment: 10 pages, 6 figure

    The Experience of the Pediatric Outpatient Therapy Waiting Room Design for Autistic Children

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    Introduction: Autistic children attend an annual average of 41.5 outpatient visits, while typically developing children attend an average of 3.3 visits (Liptak, Stuart, & Auinger, 2006). Autistic children generally experience sensory processing and self-regulation differences. Outpatient therapy waiting rooms are frequented by autistic children for outpatient services. These settings consist of unpredictable and uncontrollable stimuli that may be difficult for children with different sensory needs to tolerate, leading to high stress levels and struggles with self-regulation impacting their experience (Higuera-Trujillo et al., 2020; Schaaf et al., 2011). However, there is scant occupational therapy research informing the design of supportive waiting room environments for autistic children in the outpatient therapy setting (Pfeiffer et al., 2017). Due to the increased prevalence of autism and significant differences in sensory and self-regulation needs it is essential to design inclusive healthcare environments to improve the experience of outpatient settings and improve access to healthcare for this population (Pfieffer et al., 2017; Tola et al., 2021). Purpose: This study aimed to better understand the experience of a pediatric outpatient therapy waiting room for autistic children and to identify facilitators and barriers in the environment’s design that impact the child’s ability to transition to and from and participate in their therapeutic services. Methods: Data collection included participant observations, semi-structured interviews with the participant and their family, administration of parent surveys, and the Sensory Processing Measure™, Second Edition (SPM-2, Parham et al., 2021). Multiple data sources allowed for data triangulation to capture the impact of the environmental design on the participants’ experience of the outpatient therapy waiting room. Data analysis followed Kiger and Varpio’s (2020) six-step recursive method to arrive at themes and subthemes. Results: Three children and their families participated in this study. Three qualitative themes emerged: waiting room triggers, facilitating regulation, and supported inclusion. Specific barriers and facilitators of the current waiting room design that impacted the participants’ and their families experience were identified. Conclusions: Findings indicated that the current design and features of the outpatient therapy waiting room did not always meet the sensory or regulatory needs of the participants. A multi-disciplinary collaboration between designers and occupational therapy practitioners would be beneficial to design inclusive outpatient therapy waiting rooms to support a positive experience for autistic children and their families and to improve access to healthcare. References Higuera-Trujillo, J.L., Millán, C.L., Montaña i Aviñó, A., & Rojas, J. (2020). Multisensory stress reduction: a neuro-architecture study of paediatric waiting rooms. Building Research & Information, 48(3), 269-285. https://doi.org/10.1080/09613218.2019.1612228 Kiger, M. E., & Varpio, L. (2020). Thematic analysis of qualitative data: AMEE guide no. 131. Medical Teacher, 42(8), 846-854. Liptak, G.S., Stuart, T., & Auinger, P. (2006). Health care utilization and expenditures for children with autism. Journal of Autism and Developmental Disorders, 36, 871-879. doi: 10.1007/s10803-006-0119-9 Parham, L. D., Ecker, C. L., Kuhaneck, H., Henry, D. A., & Glennon, T. J. (2021). Sensory Processing Measure, Second Edition (SPMTM-2) [Manual]. Western Psychological Services. Pfeiffer, B., Coster, W., Snethen, G., Derstine, M., Piller, A., & Tucker, C. (2017). Caregivers\u27 perspectives on the sensory environment and participation in daily activities of children with autism spectrum disorder. American Journal of Occupational Therapy, 71, 7104220020. https://doi.org/10.5014/ajot.2017.021360 Schaaf, R.C., Toth-Cohen, S., Johnson, S.L., Outten, G., & Benevides, T.W. (2011). The everyday routines of children with autism. Autism, 15(3), 373-389. doi: 10.1177/136231310386505 Tola, G., Talu, V,. Congiu, T., Bain, P., & Lindert, J. (2021). Built Environment Design and People with Autism Spectrum Disorder (ASD): A Scoping Review. International Journal of Environmental Research and Public Health, 18(3203). https://doi.org/10.3390/ijerph18063203. Synopsis: This study was an important step towards understanding the impact of the outpatient therapy waiting room design through autistic children’s lived experiences. Findings from this study inform designers of potential facilitators to create a positive experience when designing future outpatient therapy waiting rooms to maximize children’s ability to access therapeutic services. This study also highlights the unique skillset of occupational therapy practitioners to address sensory processing, self-regulation, and the person-environment fit. A collaboration between designers and occupational therapists is warranted to create environments that enable children to participate more successfully in healthcare environments. Acknowledgments: Thomas Jefferson University, Children’s Specialized Hospital, D. Jill Harri

    Vlasov Description Of Dense Quark Matter

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    We discuss properties of quark matter at finite baryon densities and zero temperature in a Vlasov approach. We use a screened interquark Richardson's potential consistent with the indications of Lattice QCD calculations. We analyze the choices of the quark masses and the parameters entering the potential which reproduce the binding energy (B.E.) of infinite nuclear matter. There is a transition from nuclear to quark matter at densities 5 times above normal nuclear matter density. The transition could be revealed from the determination of the position of the shifted meson masses in dense baryonic matter. A scaling form of the meson masses in dense matter is given.Comment: 15 pages 4 figure

    Epigenetic aging and perceived psychological stress in old age

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    Towards targeted dietary support for shift workers with type 2 diabetes (Shift-Diabetes study): A mixed-methods case study protocol

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    BACKGROUND: Blood glucose is higher in people working night-shifts compared to day-workers. Changes to eating behaviour, activity, and sleep patterns in addition to circadian disruption are likely to impact glucose management in night-shift workers with Type 2 diabetes. AIM: To investigate current dietary intake and glucose variability during night work, including barriers and facilitators to dietary behavior in this context. METHODS: A mixed-methods case study will be conducted. Shift workers with Type 2 diabetes working in a hospital setting will be recruited to this two-part study. Part 1: 70 participants will complete a 10-day observational study collecting data on continuous glucose, diet (self-report diary), sleep and physical activity during a period covering night work, rest days and non-night workdays. Mean glucose concentration and variability, and the mean healthy diet index score, will be compared between days of night work, non-night work and rest, after adjusting for other individual factors (sleep/physical activity/demographics). Part 2: A sample (n~13) will complete semi-structured interviews based on behavioural science frameworks to explore barriers/enablers to dietary behaviour when working night shifts. This will inform a quantitative survey to explore the generalisability of interview findings. DISCUSSION: Findings from Part 1 and 2 will be triangulated to identify potential intervention strategies to address key barriers and enablers to healthier eating, and in turn improved glucose control, in shift workers with Type 2 diabetes. This will be facilitated through stakeholder consultation and application of behavioural science frameworks

    Atomic Parity Violation and Precision Electroweak Physics - An Updated Analysis

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    A new analysis of parity violation in atomic cesium has led to the improved value of the weak charge, QW(Cs)=72.06±0.46Q_W({\rm Cs}) = -72.06 \pm 0.46. The implications of this result for constraining the Peskin-Takeuchi parameters S and T and for guiding searches for new Z bosons are discussed.Comment: 8 pages, LaTeX, 3 figures, Submitted to Physical Review D. Updated experimental inputs and references; clarification of notatio

    ω-Conotoxin GVIA mimetics that bind and inhibit neuronal Cav2.2 ion channels

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    The neuronal voltage-gated N-type calcium channel (Cav2.2) is a validated target for the treatment of neuropathic pain. A small library of anthranilamide-derived ω-Conotoxin GVIA mimetics bearing the diphenylmethylpiperazine moiety were prepared and tested using three experimental measures of calcium channel blockade. These consisted of a 125I-ω-conotoxin GVIA displacement assay, a fluorescence-based calcium response assay with SH-SY5Y neuroblastoma cells, and a whole-cell patch clamp electrophysiology assay with HEK293 cells stably expressing human Cav2.2 channels. A subset of compounds were active in all three assays. This is the first time that compounds designed to be mimics of ω-conotoxin GVIA and found to be active in the 125I-ω-conotoxin GVIA displacement assay have also been shown to block functional ion channels in a dose-dependent manner
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