Volume 13, Issue 0 (kongore 94- 2015)
Abstract
In this research, 13 treatments including different ratios of nano-fiber cellulose, guar gum, Locust Bean and methyl cellulose (0,%0/125, %0/375,%0/5) whit a control sample were prepared that the total amount of gum used in ketchup combined and individually it has been 0 -%0/5 respectively. flow behavior Test and oscillatory test by rheometer (model MCR 501 company PaarPhysica Austria) to study the effect of different concentrations of hydrocolloids on the rheological properties of samples of ketchup, a week after production was done at 25 ° C. The results achived from the flow behavior test has been statistical analyzed by MINI TAB 16. The results of flow behavior test of ketchup samples, show a non-newtonian and pseudoplastic behavior in the all samples. The obtained results of data fitting with Carreau model show addition of nano-fiber cellulose, guar gum, Locust bean gum and methyl cellulose,the sampel contain %0/125 nano-fiber cellulose-%0/375 guar has been significant increase in all of rheological parameters treatment in comparison with commercial control sample (p<0.05). In frequency sweep test for selected samples containing NFC, guar gum, Locust bean gum and methyl cellulose, the trend of changes in elastic modulus was higher than viscose modulus (G΄>G˝) that has revealed the predominating of the elastic features in the mentioned samples that is similar to the trend of commercial control sample.
Volume 18, Issue 6 (11-2016)
Abstract
As one of the oldest sectors of economy, agriculture has had an important role in the supply of food for people and raw materials .In this study, the factors affecting the Iranian government support of agricultural products market has been investigated for the period of 1989-2011. In this regard, using the theory of efficient redistribution and panel data of 12 selected agricultural products including wheat, barley, rice, cotton, pistachio, apples, dates, beets, eggs, milk, red and poultry meat, the rationale for government intervention in the agricultural sector has been modeled in the Panel Tobit model framework and is then estimated. The results of this study indicated that the elasticity of supply and demand, the share of total exports of agricultural goods, the real income of farmers, number of farmers, the share of total agricultural output, and concentration of production are the factors that are directly related to the amount of agriculture support, such that, with the increase in each of these variables, the amount of government support has increased. However, the results showed no significant relation between the import variables (the products which have similar domestic production) and also the number of agricultural cooperatives and organizations with the level of government support.
