it is expected that residential units may replace   traditional heat and power production systems with cogeneration ones. among the different cogeneration systems, fuel cell based systems are a suitable choice due to their high efficiency, high power density, low emission and low noise. in this paper, a cogeneration system based on solid oxide fuel cells is examined. the system, including the f...

unsustainability and precarious conditions of agricultural production have caused this sector be associated with risk . crops insurance is efficient tool for controlling and reducing production and market risk and stabilizing farmers' income. in this study, the thinking system approach by using of i think software is used for analyzing and modeling of the effects of different alternatives of po...

production of science is only made possible through research, and the only form of sustainable development is one based on knowledge and science, one which follows an active economics. the purpose of the present paper is to study the factors affecting the production of science by faculty members of universities. to do so, the writer, taking inspiration from the theories of such scholars as mert...

In manufacturing institutes the only access way to maximum profit is identifying the production mix of the products based on the limitations such as policies and politics, demand and production processes. This study identifies the constraints of a tile-manufacturing company including constraints in its production and demand line using LINGO software version 15, and identifying production bottle...

efficiency is defined as a concept that determines the input output ratios in an economic system. data envelopment analysis method is a useful tool to estimate the efficiency of a unit. the purpose of this study was to estimate technical efficiency and to determine return to scale of holstein cattle farms in guilan province. therefore, the information including the number of labor and dairy cow...

This study investigated the effect of word order and age on the production and comprehension of pseudoclefts in L2 across two experiments. For each experiment 16 female students aged between 179 and 210 months were recruited from a secondary school. These students were divided into two groups based on their age range; one group for investigating the effect of word order and age on the productio...

this experiment was conducted to investigate the digestibility and fermentation parameters of diets containing flower, pod with seed and leaf of siris in sheep by two-step digestion and gas production methods. the experimental diets were including zero, 25, 50, 75 and 100 percent of siris flower, pod and leaf. the result showed that gas production potential of diet containing 50 percent leaf wa...

Thermal recovery techniques including Fast-SAGD process increases the production efciency of heavy oil reservoirs. Effective parameters in this study included injection and production rates, height of the injection, production, and offset wells, production and injection cycles, and pressure of the offset wells. In this study, optimization studies were performed. The objective function was defned a...