abstract autoregressive integrated moving average (arima) has been one of the widely used linear models in time series forecasting during the past three decades. recent studies revealed the superiority of artificial neural network (ann) over traditional linear models in forecasting. but neither arima nor anns can be adequate in modeling and forecasting time series since the first model cannot d...

This study divides the sales cycle of fresh agricultural products into two stages according to the features of fresh agricultural products, establishes two pricing strategies according to its sales and through constructing an centralized-control model of supply chain under the constraints of revenue sharing contract and through analyzing different prices in the two stages, it summarizes the sal...

Food safety begins on the farms and farmers play a crucial role in producing healthy food. Several factors were investigated here including water quality, labor health, health facilities, packaging and storage, transportation, fertilizers and solid organic materials, and field sanitation to reach more comprehensive results. So, 380 farmers were selected from 77 villages of rural areas of Gonbad...

The rapid world economic growth have stimulated the businesses towards involvement in international marketplaces due to their low business risks, low commitment of resources and high flexibility. However, the evidence indicates barriers to export are thought to vary across different stages of internationalization. Therefore, this empirical study was carried out to explore export barriers of agr...

Agricultural and environmental applications of modern biotechnology have spurred considerable controversy about their environmental risks and potential to alter the environmental impacts of other technologies and practices, such as pesticide use. The range of biotechnology products under development is expanding rapidly, and thus the potential for controversy over the environmental effects of b...

study of the variables which explain real exchange rate fluctuations and real exchange rate deviation from its long-run equilibrium path, indicates that these variables have negative effects on the supply of agricultural products, for export. therefore,it seems that any attempt on stabilizing real exchang rate and bringing it closer to its equilibrium rate can be favorable in the expansion of e...

Organic agricultural products are the best raw materials for food with high nutritional density (food supplements, functional foods, and nutraceuticals). The applied technologies in organic farming system use inputs free of hormones, GMOs, pesticides, antibiotics other synthetic substances - all these allow both preservation bio-availability active compounds during processing elimination toxico...

Recently a large number of tests and experiments have been done to evaluate the effects of their impact on agricultural products using high techniques like, vibration (acoustic, ultrasonic and sonic response).Some modification methods have been applied to impact probe and signal conditioning to improve the firmness prediction performance and reduce the potential for bruising. The inspection of ...

Rapid multi-residue analysis of pesticides in agricultural products was studied by using LC-MS/MS. Pesticide residues in 10 g of homogenized agricultural products were extracted with 30 mL of acetonitrile and salted out with 4 g of anhydrous magnesium sulfate and 1 g of sodium chloride in the presence of citrate salts for buffering in a disposable tube. Co-extractives were removed by use of our...

Weekly composite air samples were collected from early April through to mid-September 1995 at three paired urban and agricultural sites along the Mississippi River region of the Midwestern United States. The paired sampling sites were located in Mississippi, Iowa, and Minnesota. A background site, removed from dense urban and agricultural areas, was located on the shore of Lake Superior in Mich...