1. introduction the process by which the net radiation is transformed to the atmospheric dynamical energy, occur to a large degree at the interface between the surface and the atmosphere. as the driving force for such process, an accurate estimation of the net radiation at the earth’s surface is a necessary input for surface process models. net radiation is a key component in the surface radiat...

introduction the complexity of natural ecosystem, as the rangelands, is caused to propose the different approaches toevaluatethe ecosystem on the basis of sustainable and systematic management. study on the interaction connectionsbetween plants and biotic and abiotic factors in the rangeland ecosystem can be achieved by relationsofmanagerial strategies in order to conduct the rangeland health. ...

introduction adequate nutrition is one of the critical factors in ensuring the health of individuals, families and communities. food is one of the basic needs of human beings. rural people produce meat, fruits, vegetables and other food materials. however, there is no evidence that they have a good nutrition regime. in iran, grains, oils and fats, vegetables and fruits are consumed more than ot...