Beyond the Ångström Exponent: Probing Additional Information in Spectral Curvature and Variability of In Situ Aerosol Hyperspectral (0.3-0.7 µm) Optical Properties.

Ångström exponents (α) allow reconstruction of aerosol optical spectra over a broad range of wavelengths from measurements at two or more wavelengths. Hyperspectral measurements of atmospheric aerosols provide opportunities to probe measured spectra for information inaccessible from only a few wavelengths. Four sets of hyperspectral in situ aerosol optical coefficients (aerosol-phase total extinction, σ ext, and absorption, σ abs; liquid-phase soluble absorption from methanol, σ MeOH-abs, and water, σ DI-abs, extracts) were measured from biomass burning aerosols (BBAs). Hyperspectral single scattering albedo (ω), calculated from σ ext and σ abs, provide spectral resolution over a wide spectral range rare for this optical parameter. Observed spectral shifts between σ abs and σ MeOH-abs/σ DI-abs argue in favor of measuring σ abs rather than reconstructing it from liquid extracts. Logarithmically transformed spectra exhibited curvature better fit by second-order polynomials than linear α. Mapping second order fit coefficients (a 1, a 2) revealed samples from a given fire tended to cluster together, that is, aerosol spectra from a given fire were similar to each other and somewhat distinct from others. Separation in (a 1, a 2) space for spectra with the same α suggest additional information in second-order parameterization absent from the linear fit. Spectral features found in the fit residuals indicate more information in the measured spectra than captured by the fits. Above-detection σ MeOH-abs at 0.7 µm suggests assuming all absorption at long visible wavelengths is BC to partition absorption between BC and brown carbon (BrC) overestimates BC and underestimates BrC across the spectral range. Hyperspectral measurements may eventually discriminate BBA among fires in different ecosystems under variable conditions.

The Use of Immersive Environments for the Early Detection and Treatment of Neuropsychiatric Disorders.

Neuropsychiatric disorders are highly prevalent conditions with significant individual, societal, and economic impacts. A major challenge in the diagnosis and treatment of these conditions is the lack of sensitive, reliable, objective, quantitative tools to inform diagnosis, and measure symptom severity. Currently available assays rely on self-reports and clinician observations, leading to subjective analysis. As a step toward creating quantitative assays of neuropsychiatric symptoms, we propose an immersive environment to track behaviors relevant to neuropsychiatric symptomatology and to systematically study the effect of environmental contexts on certain behaviors. Moreover, the overarching theme leads to connected tele-psychiatry which can provide effective assessment.

Adherence to the Pediatric Preinduction Checklist Is Improved When Parents Are Engaged in Performing the Checklist.

BACKGROUND: The World Health Organization recommends including the parents in completion of the pediatric surgical safety checklist. At our hospital, the preinduction surgical safety checklist is conducted in the preoperative holding with anesthesia, nursing, and often with the parents of children undergoing an operative procedure. We hypothesized that adherence to the preinduction checklist is better when parents are engaged in surgical safety checklist performance. METHODS: An observational study of adherence to the preinduction checklist for nonemergent pediatric operations was performed (2016-2017). Adherence was defined as verbalization of checkpoints. Only checkpoints (patient identification, procedure, site marking, weight, allergies, and NPO status) relevant to parental knowledge were evaluated. Parental engagement was based on: positive body language, eye contact, lack of distractions, and understanding of checkpoints. RESULTS: 484 preinduction surgical safety checklists were observed (interrater reliability >0.7). Partial completion occurred in 55% cases; only 41% checklists were fully completed. Parents were present for 81% of checklists, and more checkpoints were performed when parents were present (5, IQR 4-6) versus absent (2, IQR 1-3, P < .001). Increased preinduction adherence was associated with increased parent engagement by linear regression analysis (1.20, 95%CI 1.05-1.33). Staff confirmed more checkpoints with engaged parents (28-78%) versus when parents were not engaged (1-9%, P < .001 for all checkpoints). CONCLUSION: Overall preinduction surgical safety checklist performance was poor (less than half of checklists fully completed). In contrast, checklist adherence improved with parental presence and engagement during performance of the checklist.