residual ventricular septal defects (vsd) are major complications after cardiac surgery. we studied the incidence of this complication, risk factors for its occurrence and short-term follow-up in 179 pediatric patients that underwent surgical closure of vsd from april 2003 until may 2004. all data were gathered retrospectively except measurements of shunt ratio. studied risk factors included ag...

background: due to the continuous use and also the individual’s different health conditions that use the service, swimming pools may be a suitable place to transfer different types of diseases. it has always been a serious concern from the health point of view. methods: in this descriptive study, the sampling was conducted as non- probable purposive. isfahan health center number 1 including 19 ...

in this study, a new method for joining aluminum tubes in subsurface structures using steel converting and aluminum welding are presented and reviewed. but near the weld area is under high thermal cycle and will cause residual stresses in heat affected zone. therefore for assessment of proposed connection from the perspective of residual stress by using the finite element method welding of tube...

with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

in this paper, we propose a new residual analysis method using fourier series transform into fuzzy time series model for improving the forecasting performance. this hybrid model takes advantage of the high predictable power of fuzzy time series model and fourier series transform to fit the estimated residuals into frequency spectra, select the low-frequency terms, filter out high-frequency term...

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