this study was an attempt to find out whether co-teaching model has statistically any significant impact on improving motivation and achievement of iranian young efl learners or not. the study was conducted at salehin english language department in tehran. to accomplish the purpose of this study, the researchers chose a sample of 91 participants which was reduced to 62 homogenous students throu...

Agricultural nonpoint phosphorus (P) pollution is a primary cause of eutrophication in many freshwater systems. Identifying areas that are at high risk for P loss in a watershed and concentrating management efforts on these smaller sections is a more effective method for limiting P loss than implementing general strategies over a broad area. A modified P index scheme was used to assess the risk...

Abstract We consider two recent conjectures made by Harrington, Henninger-Voss, Karhadkar, Robinson and Wong concerning relationships between the sum index, difference index exclusive number of graphs. One conjecture posits an exact relationship first invariants; we show that in fact predicted value may be arbitrarily far from truth either direction. In process establish some new bounds on both...