Abstract To study the propagation characteristics of acoustic emission signals in Zelkova schneideriana under different boundary conditions, three types conditions were generated by applying aluminum plates and sound-absorbing cotton on surface specimens. Firstly, sudden continuous (AE) sources simulated PLB (pencil–lead break) tests signal generator specimen surface, AE collected 5 sensors equ...

The concentrations of cadmium, copper, nickel, zinc and lead were investigated in various components of smooth-leaved elm (Ulmus carpinifolia) tree in three sites (polluted, moderately polluted, and control) in Abadeh, Iran, in July 2015. The experiment was conducted using factorial experiment in a Completely Randomized Design with three replications. The concentration of heavy metals was measu...