in order to evaluate competition among some weed species and canola, a field experiment in astan ghods razavi's field in mashhad was done on 2007-2008. thirty 50×50 cm quadrates were used in two times (stem and flower production) to measure the canola dry weight, leaf area index and canola and weeds density with destruction and thirty similar quadrates were used for counting weed species a...

background: considering the controversial information regarding the effects of perchlorate on thyroid function of high risk population as neonates, and given the high prevalence rate of thyroid disorders specially congenital hypothyroidism in our region, this study aims to investigate for the frst time in iran, the relationship between drinking groundwater perchlorate and cord blood thyroid hor...

on Re(s) > 1/2. If P = Py = {p; N(p) ≤ y} and y 7→ ∞, we know that each of fP (s, χ), f ′ P (s, χ) tends to 0. But unless Re(s) > 1, the convergence (say, for each fixed s) cannot be expected to be uniform in χ. The speed of convergence should depend on the size of the norm of the conductor of χ. We shall prove that, nevertheless, for each case of gP = fP or f ′ P and for each positive integer ...