background and aims: since using city power for welding process is not allowed, diesel generators are used as a power supply in construction industries. they could be introduced as a main source of noise pollution. the purposes of this study were to assess and control noise pollution produced by construction diesel generators in hamadan, iran. methods: in this descriptive, cross-sectional study...

Student access to laboratory experiments is critical in science and engineering curricula. Universities invest tremendous amounts of funding and energy in establishing and maintaining traditional labs for physics, engineering, circuit design, controls, and other fields. Along with the high cost associated with such labs, there are other problems inherent in this practice. First, due to the expe...

the doubly fed induction generator (dfig) is one of the most popular technologies used in wind power systems. with the growing use of dfigs and increasing power system dependence on them in recent years, protecting of these generators against internal faults is more considered. loss of excitation (loe) event is among the most frequent failures in electric generators. however, loe detection stud...

Abstract The recent development in the field of wearable electronics has increased demand for batteries as power sources which are subjected to periodic recharging and replacement. Therefore, next challenge is design new systems sustainable energy portable electronic devices that can be easily integrated into textiles such thermoelectric generators convert waste heat electricity. Looking at thi...

This study presents an innovative and simple way to increase the rate of heat transfer in a spiral plate heat exchanger model. Several circular cross-section rods, as continuous vortex generators, have been inserted within the spiral plate heat exchanger in the cross-stream plane. The vortex generators are located at various azimuth angles of α=30◦, 60◦, 90◦, and 120◦ with non-dimensional diame...