Paul B. Freeman, O.D. Dsive guidelines in both optometry and ophthalmology for care of the patient with a visual impairment, there are still those who feel that once there is a measured decrease in visual acuity based on a pathology, the only helpful recourse is magnification. Unfortunately, the ‘‘best corrected’’ visual acuity is not always determined or verified. Applying magnification withou...

Do we underestimate the benefi ts of antidepressants? In the past 5 years, doubts have been raised about the therapeutic eff ectiveness of antidepressants in patients with depressive disorders, because of the small diff erences in symptom improvement between antidepressants and placebo recorded in randomised controlled trials (RCTs). With the recent debates about lowering of disease thresholds ...

We report the first Fe isotopic anomalies and the first Ni isotopic ratio measurements in presolar SiC grains of separate KJG from the Murchison meteorite. With NanoSIMS, we analyzed Fe and Ni in 37 X grains from Type II supernovae and 53 SiC grains of other types. TheNi/Fe and Co/Fe ratios in grains of all types aremuch higher than in the gas from which the grains are believed to have condense...

this paper presents an indirect adaptive system based on neuro-fuzzy approximators for the speed control of induction motors. the uncertainty including parametric variations, the external load disturbance and unmodeled dynamics is estimated and compensated by designing neuro-fuzzy systems. the contribution of this paper is presenting a stability analysis for neuro-fuzzy speed control of inducti...

In this paper, a new bidirectional buck-boost dc-dc converter with capability of soft switching and zero input current ripple is proposed. The coupled inductor is used in the proposed converter to eliminate the input current ripple. In the proposed converter, zero voltage switching (ZVS) and zero current switching (ZCS) can be obtained for the main and auxiliary switches, respectively. In addit...