blends of sorghum and soybean flours were processed in a co-rotating twin screw extruder to prepare expanded product. response surface methodology (rsm) was used to study the effect of soya level (sl), feed moisture (fm), barrel temperature (bt) and screw speed (ss) on extruder system parameters and physical properties of the extrudate. response variables were product temperature (pt), motor to...

background and aim: occupational stress is one of the key factors in reducing staff productivity in organizations with physical and psychological impacts on employees. nursing and midwifery are among the most stressful professions. therefore, this study aimed to determine the relationship between occupational stress and work ability of midwives in mashhad, iran in 2011. materials and methods: t...