An algorithm is given which makes only $O(\log n)$ comparisons, and which will determine the ordering of the uniformly distributed (pseudo random) Weyl sequences given by $\{ (k\alpha )\bmod 1:1 \leqq k \leqq n\} $, where $\alpha $ is an unspecified irrational number. This result is shown to be best possible in the sense that no algorithm can perform the same task with fewer than $ \Omega (\log...

abstract the climate change was known to force local hydrology, through changes in the pattern of precipitation, temperature and the other hydrological variables. in this research, the impact of global warming on maximum and minimum temperature, precipitation and evapotranspiration (wheat, corn, tomato and sugar beet) of kashafrood basin under two climate change scenarios (a2 and b2), and the o...

New stellar models which track the production and destruction of He (and D) have been evolved for a range of stellar masses (0:65 M=M 100), metallicities (0:01 Z=Z 1) and initial (main sequence) He mass fractions (10 5 X3;MS 10 ). Armed with the He yields from these stellar models we have followed the evolution of D and He using a variety of chemical evolution models with and without infall of ...

the purpose of this study is to evaluate financial participation of farmers to reduce the adverse environmental effects of contaminated water by using contingent valuation approach and tobit model by heckman's two stage. to achieve the desired goal, 100 questionnaires collected by a random sampling from farmers of kashaf- rood basin in mashhad city in 2014. results showed that variables of age,...