pulse-width modulated (pwm) adjustable frequency drives (afds) are extensively used in industries for control of induction motors. it has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. hence, overshoots, high rate of rise, harmonics and transients are observed in the voltage wave. they increase voltag...

Residual compressive stress can improve fretting fatigue strength. In this paper, the effects of residual stress on fretting fatigue of Al 2024-T351 alloy specimens are studied using a numerical approach. The extended finite element method combined with the cyclic cohesive zone model is adopted to model fretting fatigue crack growth behavior. It is shown that residual stress changes the frettin...

stress is not always a direct result of stressful conditions, but rather the way they are perceived. thus individual variables that may be associated with perceived stress should be examined in stress studies. this study investigates the intermediary role of self-efficacy in relation with stress, glycosylated haemoglobin and health-related quality of life in patients with type2 diabetes.all wom...

background: the role of individual healthy behaviors, like physical activity, nutrition and stress management, on reduction of the rate of disease mortality and morbidity is well known. the aim of this study is to determine the healthy life styles of teachers in district 4 of esfahan, iran, in 2010. methods: the participants of this cross-sectional study were 96 teachers in  district 4, selecte...

In order to shorten test time and realize rapid evaluation of the reliability of products, a method of optimal design on multiple-crossed step-down stress accelerated life test (hereinafter written as MCSDS-ALT) based on Monte-Carlo simulation is proposed. The optimal plan of combined stresses in the accelerated life test is designed. The analogue simulation on the step-down accelerated life te...