Biomedical subjects
William J Hall
Publications and source records attributed to William J Hall.
A novel additive for the reduction of acid gases and NO(x) in municipal waste incinerator flue gas.
The reduction of SO2, HCl, and NO(x) concentrations using calcium magnesium acetate (CMA) as a novel sorbent in a simulated municipal waste incinerator flue gas was investigated. The reduction of individual SO2, HCl, and NO(x) concentrations was tested at 850 degrees C and it was found that CMA could reduce the SO2 concentration by 74%, HCl concentration by 64%, or NO(x) concentration by 94%. It was observed that individual SO2 or HCl capture increased with increasing initial oxygen concentration in the reacting gas or increasing sorbent input. NO(x) reduction decreased with increasing initial oxygen concentration in the reacting gas. The simultaneous reduction of SO2, HCl, and NO(x) concentrations by CMA was also investigated. It was found that CMA could simultaneously capture 60% SO2 and 61% HCl and reduce NO(x) concentrations by 26%, when the initial oxygen concentration in the reacting gas was 4%. During the simultaneous reduction of SO2, HCl, and NO(x), it was noted that as the initial oxygen concentration in the reacting gas increased, the efficiency of SO2 capture increased too, but the efficiency of HCl capture and the efficiency of NO(x) destruction decreased.
A tribute to mentors in geriatric medicine: results of a national survey of fellowship-trained geriatricians 1990-1998.
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The current state of geriatric medicine: a national survey of fellowship-trained geriatricians, 1990 to 1998.
The rapid growth of the older population has focused national attention on the need for physicians trained in geriatric medicine. To gain insight into the evolving status of the field, with particular focus on career decision-making and academic career development of trainees, we conducted a survey of physicians recently completing geriatric fellowships. The 107 accredited extant geriatric fellowship programs in the United States and Puerto Rico were contacted to identify trainees from 1990 to 1998. A mailed survey addressed relevant career development and training issues. Four hundred ninety out of 787 (62%) physicians responded; 20% completed 1 year and 80% 2 or more years of training. Half made the decision to pursue a career in geriatrics during residency, 27% decided before/during medical school, and a mentor influenced 48%. Currently, 80% have a Certificate of Added Qualifications in geriatric medicine, 69% hold academic appointments, 78% teach, 39% participate in research, and 44% author publications. Most are doing predominantly clinical work in multiple settings. Further analysis of the 1996-to-1998 cohort revealed that those completing fellowships of 2 or more years are more likely to identify all geriatrics as their professional focus, conduct and author research, work with multidisciplinary teams, and participate in professional geriatric societies. This national survey documents career decision-making and the academic and clinical profiles of physicians completing geriatric fellowship training in the past decade. Longer fellowship training is associated with academic career development. Although there is a national need to train clinical geriatricians, the additional need to train and fund future geriatric academic leaders requires increased attention.