Method of Testing Oxygen Regulators

Oxygen regulators are used in aircraft to regulate automatically the flow of oxygen to the pilot from a cylinder at pressures ranging up to 150 atmospheres. The instruments are adjusted to open at an altitude of about 15,000 ft. and thereafter to deliver oxygen at a rate which increases with the altitude. The instruments are tested to determine the rate of flow of oxygen delivered at various altitudes and to detect any mechanical defects which may exist. A method of testing oxygen regulators was desired in which the rate of flow could be determined more accurately than by the test method previously used (reference 1) and by which instruments defective mechanically could be detected. The new method of test fulfills these requirements

NACA Technical Notes

Oxygen regulators are used in aircraft to regulate automatically the flow of oxygen to the pilot from a cylinder at pressures ranging up to 150 atmospheres. The instruments are adjusted to open at an altitude of about 15,000 ft. and thereafter to deliver oxygen at a rate which increases with the altitude. The instruments are tested to determine the rate of flow of oxygen delivered at various altitudes and to detect any mechanical defects which may exist

Social impairment in relation to clinical symptoms in youth at high risk for bipolar disorder

AimSocial impairment is common in individuals with bipolar disorder (BD), although its role in youths at high-risk for BD (i.e., mood symptoms in the context of a family history of BD) is not well understood. Social impairment takes many forms including social withdrawal, relational aggression, physical aggression, and victimization. The aim of this study was to explore the links between social impairment and clinical symptoms in youth at high-risk for BD.MethodsThe sample included 127 youths with elevations in mood symptoms (depression or hypomania) and at least one first and/or second degree relative with BD. Measures of youths' current psychopathology (i.e., depressive and manic severity, suicidality, anxiety, and attention-deficit/hyperactivity disorder [ADHD]) were regressed onto youths' self-reports of social impairment (i.e., social withdrawal, relational aggression, physical aggression, and victimization).ResultsDepressive symptoms, suicidal ideation, and anxiety symptoms were related to social withdrawal. Suicidal ideation was also related to reactive aggression. ADHD symptoms related to reactive and proactive aggression as well as relational victimization. Manic symptoms were not associated with social impairment in this sample.ConclusionsAlthough cross-sectional, study findings point to potential treatment targets related to social functioning. Specifically, social withdrawal should be a target for treatment of childhood depressive and anxiety symptoms. Treatments that focus on social skills and cognitive functioning deficits associated with BD may also have clinical utility

Effects of Family-Focused Therapy vs Enhanced Usual Care for Symptomatic Youths at High Risk for Bipolar Disorder

ImportanceBehavioral high-risk phenotypes predict the onset of bipolar disorder among youths who have parents with bipolar disorder. Few studies have examined whether early intervention delays new mood episodes in high-risk youths.ObjectiveTo determine whether family-focused therapy (FFT) for high-risk youths is more effective than standard psychoeducation in hastening recovery and delaying emergence of mood episodes during the 1 to 4 years after an active period of mood symptoms.Design, settings, and participantsThis multisite randomized clinical trial included referred youths (aged 9-17 years) with major depressive disorder or unspecified (subthreshold) bipolar disorder, active mood symptoms, and at least 1 first- or second-degree relative with bipolar disorder I or II. Recruitment started from October 6, 2011, and ended on September 15, 2016. Independent evaluators interviewed participants every 4 to 6 months to measure symptoms for up to 4 years. Data analysis was performed from March 13 to November 3, 2019.InterventionsHigh-risk youths and parents were randomly allocated to FFT (12 sessions in 4 months of psychoeducation, communication training, and problem-solving skills training; n = 61) or enhanced care (6 sessions in 4 months of family and individual psychoeducation; n = 66). Youths could receive medication management in either condition.Main outcomes and measuresThe coprimary outcomes, derived using weekly psychiatric status ratings, were time to recovery from prerandomization symptoms and time to a prospectively observed mood (depressive, manic, or hypomanic) episode after recovery. Secondary outcomes were time to conversion to bipolar disorder I or II and longitudinal symptom trajectories.ResultsAll 127 participants (82 [64.6%] female; mean [SD] age, 13.2 [2.6] years) were followed up for a median of 98 weeks (range, 0-255 weeks). No differences were detected between treatments in time to recovery from pretreatment symptoms. High-risk youths in the FFT group had longer intervals from recovery to the emergence of the next mood episode (χ2 = 5.44; P = .02; hazard ratio, 0.55; 95% CI, 0.48-0.92;), and from randomization to the next mood episode (χ2 = 4.44; P = .03; hazard ratio, 0.59; 95% CI, 0.35-0.97) than youths in enhanced care. Specifically, FFT was associated with longer intervals to depressive episodes (log-rank χ2 = 6.24; P = .01; hazard ratio, 0.53; 95% CI, 0.31-0.88) but did not differ from enhanced care in time to manic or hypomanic episodes, conversions to bipolar disorder, or symptom trajectories.Conclusions and relevanceFamily skills-training for youths at high risk for bipolar disorder is associated with longer times between mood episodes. Clarifying the relationship between changes in family functioning and changes in the course of high-risk syndromes merits future investigation.Trial registrationClinicalTrials.gov identifier: NCT01483391

Five modes of “listening deeply” to pastoral sounds

In his 'Tales from Ovid' Ted Hughes writes that in the Age of Gold people ‘listened deeply to the source’. This essay asks what this might mean, what modes of listening might achieve this and how we would recognise it. Beginning this discussion with a georgic folk song, which appears to be about harvest workers pastoralising their work, this essay opens up the first of five modes of listening by suggesting that there is a playful, harvest home, self-ironic listening mode at work here. Discussion moved from Andrew Marvel’s ‘The Garden’ to Bob Dylan’s song ‘Highlands’ to Keats’ ‘The Nightgale’. The final line of Coleridge’s poem ‘This Lime-Tree Bower my Prison’ is tested with reference to a passage from Cormac McCarthy’s 'All the Pretty Horses'. Recent research offers examples of listening from the Hawai’an people and from Blackfeet country in Montana