LOWER BOUNDS FOR THE BUCKLING PRESSURE OF SPHERICAL SHELLS

Hydrostatic buckling pressure calculations for spherical shell

On Internal Fracture of Solids

Initiation and propagation of internal fracture in solid

Investigation of inverterless control of interior permanent-magnet alternators

Copyright © 2006 IEEEThis paper investigates the performance and control of a low-cost 6-kW concept demonstrator of an "inverterless" automotive alternator. This is based on a switched-mode rectifier (SMR) combined with a high-flux interior permanent-magnet (PM) machine. Duty cycle control of the SMR is described and the theoretical predictions are compared with open-loop experimental results. The efficiency of the concept demonstrator is examined as a function of speed and load. Control issues regarding automotive operation are discussed.Chong-Zhi Liaw, David M. Whaley, Wen L. Soong and Nesimi Ertugru

The Specific Characteristics in Children with Obstructive Sleep Apnea and Cor Pulmonale

Background. The prevalence of obstructive sleep apnea (OSA) in the pediatric population is currently estimated at 1-2% of all children. The purpose of this study was to investigate the clinical and hemodynamic characteristics in pediatric patients with cor pulmonale and OSA. Methods. Thirty children with the diagnosis of OSA were included. These patients consisted of 26 male and 4 female children with a mean age of 7 ± 4 years old. Five of those children were found to be associated with cor pulmonale, and 25 had OSA but without cor pulmonale. Results. The arousal index was much higher in children with OSA and cor pulmonale. The children with OSA and cor pulmonale had much lower mean and minimal oxygen saturation and a higher incidence of bradycardia events. All 5 patients with OSA and cor pulmonale underwent an adenotonsillectomy, and the pulmonary arterial pressure dropped significantly after the surgery. Conclusion. This study demonstrated that the OSA pediatric patients with cor pulmonale had the different clinical manifestations and hemodynamic characteristics from those without cor pulmonale. The adenotonsillectomy had excellent results in both the OSA pediatric patients with and without cor pulmonale

Human genetics and genomics a decade after the release of the draft sequence of the human genome

10.1186/1479-7364-5-6-577Human Genomics56577-62

Internal fracture caused by focusing of explosive waves

Internal fracture caused by focusing of explosive wave

Strengthening family relationship to increase family health, happiness and harmony: Findings from a Community-based Participatory Research (CBPR) project under FAMILY: A Jockey Club Initiative for a Harmonious Society Project in Hong Kong

Oral Poster Presentation SessionSham Shui Po (SSP) district is one of the districts with high population density and lowest median household income. A CBPR project “Enhancing Family Well-being Project” was conducted by SSP District Social Welfare Office and School of Public Health, the University of Hong Kong from February 2012 to May 2013. (1) To promote family health, happiness and harmony (3Hs) by building capacity for families to enhance family relationship; (2) To investigate the effectiveness of CBPR programmes in improving family relationship and 3Hs. After training, based on positive psychology, social service workers in 30 participating organizations designed and organized their own programmes (one 2-hour session; one 1-hour booster) on one self-selected theme (“Gratitude”, “Hope/Resilience” and “Open-mindedness”) for people aged 6+ recruited by the organization. Participants were assessed four times (T1, pre-intervention; T2, immediately post-intervention; T3, 6 weeks and T4, 3 months after T2) primarily on family relationship and family 3Hs using Family Relationship Scale and family 3H indicators respectively. 1586 individuals aged 12+ from 1031 families participated in 29 programmes. Most (89.5%) were aged 18+, 69.0% were female, 65.9% had secondary or above education level and 69.5% were married. The mean score of overall family relationship increased from 75.6 (T1) to 76.0 (T4) (effect size, ES=0.06, p=0.03). The mean scores of family expressiveness increased (ES=0.10, p<0.001) and family conflict decreased from T1 to T4 (ES=-0.05, p=0.04). Family health, happiness and harmony scores all significantly increased from T1 to T4: ES = 0.14 (p<0.001), 0.10 (p<0.001) and 0.10 (p<0.001) respectively. All changes above indicated improvements after the programmes. This CBPR brief intervention was effective in enhancing family relationship and 3Hs. The effects were small but sustained up to 3 months. The main limitation was the lack of a control group, which was not feasible in a large CBPR project.postprin

Detection of broken rotor bar faults and effects of loading in induction motors during rundown

© Copyright 2007 IEEEThe detection of broken rotor bar faults based on the common steady-state Fourier transform technique is known to be dependent on the loading condition and the quality of the supply. This paper attempts to minimise these issues by utilising the induced voltage in the stator windings after supply disconnection. When the supply is disconnected, the stator current rapidly drops to zero and the only source of the stator induced voltage an instant after the supply disconnection is due to currents in the rotor. The rotor currents are sensitive to broken rotor bar faults and directly affect the rundown induced voltage in the stator windings. The performance of two different broken rotor bar detection techniques, based on the Fourier transform and the wavelet transform, are investigated over a wide range of loading conditions