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...

As is well-known, any ordinary differential equation in one dimension can be cast as the Euler–Lagrange of an appropriate Lagrangian. Additionally, if initial autonomous, Lagrangian always chosen to time-independent. In two dimensions, however, situation more complex, and there exist systems ODEs which cannot described by this paper we display Hamiltonians describe behaviour a charged particle ...

before constitution revolution, advocacy in our country governed by islamic law and lawyers introduced as a free profession in means of that law. after that revolution the government promulgated some rules for its regulation as an official profession. by act of bar association independence, this profession declared independent. many lawyers after islamic revolution have been filtrated and by th...

this paper analyzes the effects of socio-economic factors on life expectancy. using multiple regression analysis, the paper shows that there is a positive strong correlation between life expectancy as an independent variable and per capita income, health expenditures, literacy rate and daily calorie intake. also, it shows that there is a negative strong correlation between life expectancy and n...

Cuspy triaxial potentials admit a large number of chaotic orbits, which moreover exhibit extreme “stickiness” that makes the process of chaotic mixing surprisingly inefficient. Environmental effects, modeled as noise and/or periodic driving, help accelerate phase space transport but probably not as much as in simpler potentials. This could mean that cuspy triaxial ellipticals cannot exist as ti...