in order to investigate the effects of different levels of nitrogen rate on yield and seed yield components of wheat cultivars, an experiment was conducted on araghi mahalleh (gorogan) research farm in 2008. treatments, nitrogen in the form of urea (0, 90, 180 and 270 kg/ha) and cultivars (tajan, falat and n81-18) were arranged as factorial based on randomized complete block design with four re...

The fleet assignment problem (FAP) assigns the type of airplane at each flight segment. Since airplane is an expensive resource, poor fleet assignment can cause a great increase in costs of airlines. There are so many consideration which should be tackled in formulation of a FAP problem, especially the parameters regarding to the airplanes. This paper presents a novel, mixed integer programing ...

In this paper, we present a novel multi-objective mathematical model for capacitated single allocation hub location problem. There are the vehicle capacity constraint and capacity restrictions amount of the incoming flow to the hub while the balancing requirements of incoming quantities of flow to the each hub is considered. Moreover, there is a set of available capacities for each potential hu...

Electric commercial vehicles (ECV) have the potential to substantially reduce greenhouse gas emissions, noise, and pollution in urban areas. In addition, ECVs have lower per-mile operating costs and potentially lower maintenance costs. However, the initial purchase cost of ECVs is significantly higher than the purchase cost of a conventional diesel vehicle. From a purely economic perspective, t...

Semiconductor wafer fabrication is perhaps one of the most complex manufacturing processes found today. In this paper, we construct a simulation model of part of a wafer fab using ProModel software and analyze the effect of different input variables on selected parameters, such as cycle time, WIP level and equipment utilization rates. These input variables include arrival distribution, batch si...

BACKGROUND Nurse practitioners (NPs) play an important role in providing quality primary care. However, little is known about organizational processes that best utilize NPs in care delivery and what kind of resources and support NPs need to deliver quality care within their organizations. In primary care settings, NPs often receive little support from ancillary personnel compared with physician...

Fault diagnosis is a powerful tool to reduce downtime and improve maintenance efficiency; thus, the low management cost of wind turbine systems effective utilization energy can be obtained. However, accuracy fault extremely susceptible nonlinearity noise in measured signals varying operating conditions. This paper proposes robust scheme based on ensemble empirical mode decomposition (EEMD), int...

the main purpose of this paper is survy of factors associated with reliance of external auditors on entenal adutors work , reliance on internal auditors work has significant influence on cost saving and obtaining more services to client with the same cost. optimal utilization of internal audit work can improve both the efficiency and the effectiveness of external audits and can enhance the valu...

Market-oriented reverse auction is an efficient and cost-effective method for resource allocation in cloud workflow systems since it can dynamically allocate resources depending on the supply-demand relationship of the cloud market. However, during the auction the price of cloud resource is usually fixed, and the current resource allocation mechanisms cannot adapt to the changeable market prope...

BACKGROUND The high cost and undesirable consequences of polypharmacy are well-recognized problems among elderly long-term care (LTC) residents. Despite the implementation of the 1987 Omnibus Budget Reconciliation Act, which requires pharmacist review of drug regimens in this setting, medical and drug costs for LTC residents have continued to increase. OBJECTIVE This study evaluates the North...