Reproductive competence is one of the most important components in the overall management of a cow-calf operation. The ability to maintain a 365-day calving interval in a high percentage of the females influences the profitability of all breeding operations. In most cases, low reproductive efficiency can be directly linked to the nutritional status of the animal(s). Research has shown that poor...

In this paper we present a new method to find simple or multiple roots of functions in a finite interval. In this method using bisection method we can find an interval such that this function is one to one on it, thus we can transform problem of finding roots in this interval into an ordinary differential equation with boundary conditions. By solving this equation using collocation method we ca...

heat recuperation is often used to improve the overall cycle efficiency of gas turbines. however, generally in small- scale gas turbines, it has a negative effect on turbine inlet temperature, pressure ratio and pressure drops, and thus decreases the overall cycle efficiency. in this paper, a thermodynamic model is performed to evaluate recovered heat as a function of heat exchanger effectivene...

This paper uses data envelopment analysis (DEA) to examine the technical, pure technical, and scale efficiencies of 12 branches of the agricultural bank in Guilan province, Iran over the period of 2012-2016. The first results indicated that scale inefficiency contributed more to overall technical inefficiency than pure technical inefficiency over the studied period. Results of return to scale r...

In this study, the overall performance of air PV/T, based on energy and exergy analysis has been investigated. Two combinations of air PV/T, which consist of unglazed and glazed air PV/T, are considered. Thermal analysis and numerical calculations were carried out, and the performance parameters of the system for the climate conditions of Kerman were studied. The results are presented in graphs...

Harnessing renewable energy sources (RES) using hybrid systems for buildings is almost a deontological obligation engineers and researchers in the field, increasing percentage of renewables within mix represents an important target. In crowded urban areas, on-site production storage from can be real challenge technical point view. The main objectives this paper are quantification impact consume...