background and objectives: pharmaceutical expenditures are responsible for a major part of health systems’ cost. according to the who’s statistics, iran is the first among the 20 countries in the world in terms of drug consumption. the first step in controlling consumption of a particular good is to identify factor inducing the relevant demands. hence, this study aimed to identify the pattern a...

this paper investigates an epq model with the increasing demand and demand dependent production rate involving the trade credit financing policy, which is seldom reported in the literatures. the model considers the manufacturer was offered by the supplier a delayed payment time. it is assumed that the demand is a linear increasing function of the time and the production rate is proportional to ...

Economics depends on the economic scale of planning. Economists study the characteristics of the production function, while community operating management focuses on demand realization, so that loss of sales or inventory prevents cost reductions and maximizes profits. However, companies with a lack of capacity need to achieve economies of scale and demand to realize them simultaneously, especia...

liberalization of energy price increases costs of agricultural inputs and costs of agricultural production. all these changes may affect the overall competitiveness of domestic products with similar foreign products. as a result of that, total cost of agricultural products are increased and profitability are decreased. in this paper, energy consumption for producing corn were calculated using c...

Short-term water demand modeling plays a key role in urban water resources planning and management. The importance of demand prediction is even greater in countries like Iran with frequent periods of drought. Short-term water demand estimation is useful for planning and management of water and wastewater facilities such as pump scheduling, control of reservoirs and tanks volume, pressure manage...

This thesis concerns absorbing wave machines where the absorption strategy is based on a force-feedback approach. A theoretical model, describing their behaviour correct up to second order, is developed. At first order, this model seeks to provide a theoretical transfer function, linking the demand signal to the amplitude of the desired progressive wave. In the context of force-controlled wave ...