LOUIS University of Alabama in Huntsville
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Performance comparison of variable center body configurations for a 25 mm rotating detonation rocket engine
Get PDFRotating detonation rocket engines (RDREs) are propulsion devices that harness circumferentially traveling detonation waves, providing theoretical benefits compared to classical, deflagration-based combustors. Because of the integration challenges posed by typical annular (Center Body, CB) RDREs, a cylindrical (Center Bodiless, CBL) chamber geometry is attractive. To understand the corresponding trade-offs for small-scale devices, the performance and operational characteristics for a 25 mm with removable 15 mm center body are compared using gaseous methane and hydrogen with oxygen, operating at varying equivalence ratios and at a total mass flow rate of 0.076 kg/s and varying mass flow rates at an equivalence ratio of 1.25 and 1.0. The operability of the CB geometry is greater than the CBL configuration. Additionally, thrust and specific impulse performance are generally greater for the CB than for the CBL geometry. These results of this thesis have implications for downwards RDRE mass flow rate scaling
Personalized Biofeedback for Stress Reduction: Modulating the Autonomic Nervous System through Slow breathing and Cardiovascular Monitoring
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The contributions of patient education and home visits to reduce post-cesarean hypertension readmissions
No full textCesarean births in the United States (U.S.) have increased steadily over the last decade. Researchers have identified maternal hypertension/hypertensive disorders of pregnancy (HDP) as a comorbidity associated with the increase of cesarean births. Mothers who are diagnosed with HDP and undergo a cesarean birth have a dual diagnosis of high-risk pregnancy, and due to worsening conditions, are readmitted to the hospital more frequently than mothers who experience a vaginal birth. This study aimed to determine whether a patient discharge education intervention provided by a transition of care (ToC) team or interdisciplinary care team (IDT), combined with early follow-up care from a home-health visit (HHV) contributed to reducing post-cesarean readmissions related to HDP. The control group data were retrieved from the historical records at the collection site. Those participants received the routinely administered postnatal survey, the Edinburgh Postnatal Depression Scale, and standard discharge education. The participants in the experimental group received the Childbirth Self-Efficacy Inventory, Childbirth Attitudes Questionnaire, Edinburgh Postnatal Depression Scale, ToC team discharge education, and the follow-up HHV, 10 to 14 days post-discharge. The analysis demonstrated statistically notable differences in readmission outcomes between the control and intervention groups. Among participants in the control group (n = 47), 46.8% were readmitted, while 53.2% were not. In comparison, the intervention group (n = 47) showed only 4.3% readmissions and 95.7% of participants were not readmitted within the 30-day measured timeframe, suggesting a substantial reduction in readmissions for participants who received the intervention
