نتایج جستجو برای: small field
تعداد نتایج: 1512379 فیلتر نتایج به سال:
In this paper, a system with spin S=3/2 with general isotropic nearest neighbor exchange within a mean field approximation possess is discnssed. We derive equations describing non-Heisenberg isotropic model using coherent states of SU(4) group in real parameters and then obtain dispersion equations of spin wave of dipole and quadrupole branches for a small linear excitation from the ground state.
As far as Iran is concerned in arid and semi-arid region and amount of water is limited, improvement of water consuming is very important. One of the ways for storing water is to use superabsorbent polymer. So, this research compared normal and deficit irrigation methods by considering the effects of stockosorb (0.1% and 0.3% by volume) and zeolite (10 weight% and 15 weight%) in two sandy soils...
pressurized irrigation technologies of course have the potential to raise the productivity of land and water; but, these technologies could not popularize among the smallholders who own millions of farms worldwide. in developing pressurized irrigation technologies, particularly for field crops irrigation, researchers and manufacturers have developed more specialized and expensive technologies w...
The migration of young people and the aging of rural communities, for reasons such as poverty and unemployment, will create a lot of need for identifying new approaches to the survival of rural communities. Small business entrepreneurship has an important role in reducing poverty and, ultimately, rural development. However, this kind of entrepreneurship faces many challenges in terms of environ...
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