in this paper, the behavior of saving and consumption has been considered in ramsey – cass- koopmans model’s framework. our purpose was investigation of dynamics of these variables and analysis of their response to other parameter and variable variations. so, we made lagrangian function subject to some restrictions and euler equations and other steady state path equations. and then, we have cal...

Abstract The district heating systems supply heat to a wide range of consumers. In the source such systems, highly efficient technologies are used for combined production electrical and thermal energy mainly based on steam turbine installations with backpressure turbines or adjustable extractions. Combined leads reduction in fuel consumption (fuel saving) compared separate two products. saving ...

in this study, the optimization of energy consumption and reduction of greenhouse gas emissions of irrigated lentil production in esfahan province were conducted using data envelopment analysis (dea) method. the used data were collected randomly from 140 lentil producers using a face to face questionnaire method in the cropping season of 2014-2015. based on two dea models of constant returns to...

Patterns of Politeness in Teacher-Student Interaction: Investigating an Academic Context AbstractThis study investigated politeness strategies used in instructor-student relationships, in an academic environment. To conduct the study, four university classes with different instructors were randomly selected, observed and analyzed. Brown and Levinson’s theory of politeness was drawn on as the an...

When computing resources are consolidated in a few huge data centers, a massive amount of data is transferred to each data center over a wide area network (WAN). This results in increased power consumption in the WAN. A distributed computing network (DCN), such as a content delivery network, can reduce the traffic from/to the data center, thereby decreasing the power consumed in the WAN. In thi...

Metro systems are one of the most important transportation systems in people’s lives. Due to the huge amount of energy it consumes every day, highly-efficient operation of a metro system will lead to significant energy savings. In this paper, a new integrated Energy-efficient Operation Methodology (EOM) for metro systems is proposed and validated. Compared with other energy saving methods, EOM ...