Let G and H be graphs. A substitution of H in G instead of a vertex v 2 V (G) is the graph G(v ! H), which consists of disjoint union of H and G ? v with the additional edge-set fxy : x 2 V (H); y 2 N G (v)g. For a hereditary class of graphs P, the substitutional closure of P is deened as the class P consisting of all graphs which can be obtained from graphs in P by repeated substitutions. Let ...

this study is aimed at evaluating and measuring the factors affecting the dezful wheat farmers` attitude toward the extension of wheat waste reduction. the method of research was correlative- descriptive. the population of this study is all farmers cultivated wheat in dezful from 2011 to 2012 (n=5291). the number of samples size was 360 based on krejcie and morgan table. panel of experts and al...

abstract one of the major risks in the agricultural sector is the price fluctuations risk of agricultural products. futures markets for agricultural products as one of the policies and executive approach have a significant impact on reducing price fluctuations of agricultural products. so in this study, in this study the factors affecting farmers likely to participate in the future market for p...

canola production is an important alternative for agricultural policy-makers in iran to reduce dependency on the imported vegetable oils. nevertheless, the canola planted area is only increasing at a slow pace, indicating a low willingness-to-accept of farmers. the general aim of this study was to determine the factors influencing the canola adoption in the kermanshah province in western iran. ...

shortage of water is one the main factors limiting the development of agricultural activities and farmer participation is critical to improve on-farm water management and crop productivity. this research was done with aim to identify impeding and facilitating factors influencing on using new irrigation methods by farmers in west boshroyeh township in southern khorasan. the methodological approa...