abstract using tobit model, this study investigated factors affecting on crop risk frequency of farmers in the north khorasan province. data was collected through interviewing 120 farmers of north khorasan province in 2008. results showed that age, farm ownership and off farm employment affected frequency of risk negatively. non-agricultural activity, participating in a crop supervisory plan an...

Waste materials have a great potential as sustainable and cheap sensible thermal energy storage material (STESM). There are number of previous studies on the use wastes STESM such Cofalit, coal fly ash electric arc furnace slags, by-products ilmenite mining industry potash production, municipal waste glass generated in steel industry. The aim this study is to assess demolition (DW) from urban r...

Various site preparation methods are used in Swedish forestry. However, some can lead to unnecessary disturbance, which could be avoided by using variables from digital elevation models management decisions. The current study aimed investigate how different methods, and their intensities, affect Norway spruce (Picea abies (L.) Karst.) regeneration. Additional aims were clarify these soil distur...

in this study, the structures, the ir spectroscopy, and the electronic properties of auncum (n+m≤5) bimetallic clusters were studied and compared with those of pure gold and copper clusters using the generalized gradient approximation (gga) and exchange correlation density functional theory (dft). the study of an o2-auncum system is important to identify the promotion effects of each of the two...

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background and aim: it has been several decades since the technology of frequency lowering (fl) has been proposed. however, primary research has revealed no benefits regarding the use of this technique. currently, new methods for fl and improvement of perception of speech and fricative sounds have led to the application of these methods by numerous companies to produce hearing aids. in this stu...