Aims:The main goal of this study is to minimize the function with coefficient c, which minimizes vehicles' transportation time and waiting time in supply chain centers. Study Design: Environmental pollution and shortage of nonrenewable energy resources have increased governments and people's concerns in consuming green products. Queuing and transportation theories have been used in order to reduce energy consumption in a green supply chain. Methodology: Queuing modeling was performed using LINDO Software. In order to validate the designed model, transportation data of an Iranian dairy products company was used. Results: The results showed that proper allocation of the present vehicles with certain capacities and employment of queuing theory in the green supply chain caused the reduction of energy consumption through optimizing transportation and waiting times in the green supply chain. Conclusion: Green products are the result of green supply chain management in organizations'

This study examines the relationship between EFL teachers’ quality of work life (QWL) and their job motivation. 126 Iranian EFL teachers currently working in high schools of Tehran were administered two questionnaires that assessed their motivation and quality of work life. Participants’ motivation to teach was assessed using a questionnaire developed by Noe & Bachhuber (1990) which includes three major subscales: career insight (8 items), career identity (5 items), and career resilience (13 items). In addition this study used Walton’s (1973) widely used quality of work life questionnaire. This 29-item questionnaire includes eight subscales: adequate and fair compensation (4 items), safe and healthy working (3 items), continued growth and security (3 items), constitutionalism in the work organization (5 items), the social relevance of work life (3 items), total life space (4 items), social integration in the work organization (4 items), and human progress capabilities (3 items). The results revealed that Iranian EFL teachers experience medium to low levels of motivation and QWL. In addition, a significant relationship was found between QWL categories and job motivation. Further, the best QWL predictors for teacher motivation were identified. The findings of this study are hoped to serve as a reference for principals and educational decision-makers in bringing about higher levels of motivation for language teachers.

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