r&d; is one of the most important and suitable strategies government’s policies for increasing of agricultural production and supply. in this study, in addition of economic evaluation of agricultural r&d; and determination of its rate of return, optimal iran’s agricultural r&d; expenditure is determined. so, in this article, ex-post and ex-ante evaluation by using of mathematical programming ap...

Alkyldifluorophosphites, ROPF2 (R = ^-substituted benzyl group, neopentyl, 1-adamantyl) have been obtained by a new method, involving reaction of the appropriate alkyl trimethylsilylether, ROSiMe3 with chlorodifluorophosphine, PF2C1. Reactions of these difluorophosphites with platinum(II) complexes of the type [LaPtCla] (L = PEt3, PPI13) led to products such as irans-[L2PtCl(POF2)] and {[p-XC6H...

the support of agricultural sector is adopted in various countries of the globe through different means and mostly with the aims such as increasing farmers incomes, protecting domestic products, ending dependence (on foreign goods), augmenting employment and reducing poverty. this paper tries to survey the support policies in agricultural sector in different countries as far as their components...

The biphenyl-bridged. chiral zirconocene complex rac-2.2' -biphenyl-bis( 3.4-dimethylcyclopentadienyl I zirconium dichloride catalyzes the reaction of 1.6and 1,7 -dienes with excess dibutyl magnesium to bis( butyl-magnesio-methyl '-substituted cycloalkanederivatives. Analogous reactions occur with butyl magnesium chloride and with heteroatom-t.:Ontaining dienes. The preference of 1.6-dienes for...