the frequency response analysis (fra) test has been recognized as one of the sensitive tools available for detecting electrical and mechanical faults inside power transformers. however, there is still no universally systematic interpretation technique for these tests. many research efforts have employed different statistical criteria in order to aid the interpretative capability of the fra, but...

nanocomposites based on phenolic resol and novolac resins and cloisite 30b were prepared. different kinds of phenolic resins and clay content were studied with respect to the morphology and mechanical properties of the polymer silicate layers. the phenolic resins, namely resol, novolac and their mixture and four different percentages of clay contents, 0.5, 1, 2 and 5 wt% have been considered. x...

Introduction: As sex differences have been observed repeatedly in chronic pain, it is likely that the gonadal hormones are responsible for these differences. To investigate the responsible mechanism for chronic pain different models have been created. This study is examining the effects of gonadal hormones on nociceptive responses of the rats in CCI (chronic constriction injury) and SNI (spread...

The effect of alumina and tough nylon 66 on microparticles’ presence the mechanical and thermal properties of epoxy adhesives is assessed here. In order to distribute the adhesive formulation components, in a uniform manner a mechanical stirrer is applied. The effect a combined percentage of nylon66 at (20،30،40 pph) and alumina micro-particles 20 μ (50,60,70 pph) selected based on Taguchi expe...

To improve the durability of lead free solder joints under high strain rates, such as drop and shock loading, some area array manufacturers have converted to low silver (Ag) content tin silver copper (SAC) solder spheres instead of the commonly accepted SAC305 solder. While the lower silver content SAC solder joints may address high strain rate shock loads, the durability of these joints under ...