castor bean (ricinus communis l.( with a capability to withstand harsh conditions, low nutritional needs, 50 percent of oil content and high- quality, is one of the best crop used to produce biodiesel. the first step toward introduction and widespread cultivation of this crop is to investigate the energy balance for its cultivation. to do so, energy input (include renewable and nonrenewable) an...

nowadays, wireless sensor network has been of interest to investigators and the greatest challenge in this part is the limited energy of sensors. sensors usually are in the harsh environments and transit in these environments is hard and impossible and moreover the nodes use non- replaceable batteries. because of this, saving energy is very important. in this paper we tried to decrease hard and...

linear programming is a helpful and applied method for diet formulation based on minimum cost, but the minimum cost does not always mean maximum profit. this study was carried out to introduce a new diet formulation method based upon maximum profit to be replaced for minimum cost method. a total of 400 one-day-old broiler chicks (ross 308) were employed in the study. all broilers were fed simil...

introduction: generally, subsidies are the amounts of government payments in order to provide all society members with minimum well-being. in several countries such as iran, the agriculture sector is supported by different methods to achieve goals such as increasing farmers' income, supporting domestic producers and eliminating dependence on imports, preserving employment and reducing poverty. ...