precise application of the n fertilizer rate is critical to achieve maximum yield. in major regions, empirical methods were used for determining n fertilizer requirement. these methods cannot take into account variation in management and environmental conditions on determining fertilizer requirement. crop simulation models can provide an alternative means of determining the optimum crop n requi...

1-butyl-3-methylimidazolium bromide ([bmim]br) as an ionic liquid promoted selectively oxidation of aliphatic and aromatic sulfides to the corresponding sulfoxides and the oxidative coupling of thiols to disulfides by nabro3 in excellent yields under neutral conditions.

in this study 50 samples of ecstasy tablets seized in iran during the period of 2007 through 2008 were examined and their physical characteristics (appearance, marking, scored/not scored, color, weight, diameter, thickness) were determined. in order to determine the chemical characteristics of these tablets, color tests (marquis test, simon’s test, chen’s test and gallic acid test), thin layer ...

among the six classes of pro-2-groups of finite and fixed co-classes and trivial schur multiplicator which studied by abdolzadeh and eick in 2009, there are two classes $$s_5=langle a,bmid [b,a^2]=1, a^2=[b,a]^2, (b^2)^{[b,a]}b^2=1rangle$$ and $$s_6=langle a,t,bmid a^2=b^2,[b,a]^2=1, t^a=t^{-1}[b,a], b^t=abarangle$$that have been conjectured to have deficiency zero presentations. in this paper ...

background: the formalism recommended by task group 60 (tg-60) of the american association of physicists in medicine (aapm) is applicable for β sources. radioactive biocompatible and biodegradable 153sm glass seed without encapsulation is a β- emitter with a short half life and delivers a high dose rate to the tumor in the millimeter range. in this work the dosimetry parameters of the seed for ...

Let 1 < k and m,k ∈ ℤ+. In this manuscript, we analyse the action of (semi)-prime rings satisfying certain differential identities on some suitable subset rings. To be more specific, discuss behaviour semiprime ring ℛ ([d([s,t]m), [s,t]m])k = [d([s,t]m), [s,t]m] for every s,t ∈ℛ.

Music is a g rea t zeal of t h e h u m a n spir i t . I t is a n i n s a t i a t e n e e d a n d a powerful ons l augh t t o w a r d perfect ion. I t revea ls spon taneous ly m o s t che r i shed t h o u g h t s a n d feelings. T h a t is why , t h e g rea t m a n of med ic ine a n d r e n o w n e d m u s i c i a n , Dr. Alber t Schwe i t ze r def ined : « Mus i c is a tool of t h e noble spir ...