Estimate the technical efficiency of fishing vessels operating in Chabahar region, Southern Iran

AbstractThis paper presents an analysis of technical efficiency of fishery in the Chabahar region, Southern Iran. Chabahar is in the northern end of the Gulf of Oman, is an important case study, having access to 200km of unspoiled long coastline rich in different varieties of marine life, and fishery is one of the most important economic activities in the region. A Cobb–Douglas stochastic production frontier, including a model for vessel-specific inefficiencies was applied to obtain technical efficiency for a sample of 300 fishing vessels including 166 inshore operating vessels and 134 offshore operating vessels in the study area. Results provide key information on the relative efficiencies, output elasticities, returns to scale, and the economic performance of each fishing vessel

Helmand River Flow Modeling Using Copula and Seasonal Auto Regressive Moving Average

River flow modeling has special importance in water resources management. Since the actual river flow data are often low and they correlate and depend yearly and monthly, making the data similar to historical data is so difficult and complex. In this study, 50 year data and Seasonal Auto Regressive Moving Average (SARMA) and Clayton and Frank Copulas which are the prediction and simulation methods of the river flow molding, were used to generate random flow data of Helmand River. Results show, SARMA model forecasts minimum river flow data very good, but the generated data hasn’t correlation of historical data and usually the maximum river flow is greater than real data. Otherwise, Copula preserved concordance of real data and make the data that are similar to real river flow. Therefore it is proposed that Copula is used for Helmand river flow modeling. Also this method use for simulating other river flows and also using other Copulas for river flow modeling could have the subject of future researches

Dual-stage nanopositioning scheme for 10 Tbit/in2 hard disk drives with a shear-mode piezoelectric single-crystal microactuator

10.1109/TMAG.2014.2359417IEEE Transactions on Magnetics51