---

The aim of this study is to explore the feasibility of setting up a Commodities Futures Market in Iran. Specifications for the margin requirements, daily price movement limits, the length of expiration intervals, tick sizes and contract size of various potential future contracts are hereby examined. Saffron, pistachio and rice emerge as the three suitable Iranian agricultural commodities. A new computational method of Value at Risk (VaR) optimization model, using a nonparametric sampling approach, is employed to determine the daily margin requirements and daily price fluctuation limits. Expiration intervals are determined by the simulated daily future price with a minimum of volatility. The daily risk free interest rate and the minimum daily average trading value of a participant in the Tehran Stock Exchange (TSE) are used as benchmarks to determine the minimum tick size and contract size for each commodity. These contract specifications are the initially suggested quantities for setting up an agricultural futures market in Iran.

---

One of the really important challenges facing agricultural producers is the choice of their product distribution channels. The present study is aimed at investigating the citrus marketing channel strategy and its determinants among citrus orchardists of Mazandaran using a Nested Logit model. Some two hundred and fifty two orchardists from 15 cities of Mazandaran were taken as the study samples. Four distribution channels and three nests were considered in determining the factors influencing the choice of marketing channel. Since the estimated structural parameter did satisfy the condition of lying between 0 and 1, the nested logit model was proved as appropriate for the intended application. The results indicated that the orchard distance from the nearest city, orchardist’s experience, sale time, marketing costs, the kind of product and the dominant marketing channel constitute the most important factors of distribution channel selection as regards the citrus producers in Mazandaran. According to the obtained results, by increase in the orchards’ distance from the nearest city, the producers' tendency to sell their products through channels of shorter distances from buyers also increases. Also, results revealed that the older the orchardist, the higher his/her degree of risk aversion. An estimation of binomial Logit Model for the second and third nests had consistent results regarding the marketing costs. As the marketing costs increases, the orchardist’s tendency to sell his/her products through other channels of a lower marketing cost will increase. Furthermore, results revealed that as the citrus price rises, the producers get further intended to sell their products in the market rather than selecting either the pre-sale method or selling their produce to the local dealers.

---

In this paper, drug coated magnetic nanoparticle delivery is numerically studied. Specific part of right foot vessel connected to the abdominal aorta is considered as target tissue. Single wire is applied as magnetic source. Buongiorno’s two-phase model is modified by adding the magnetophoresis term to the volume fraction transport equation. Governing unsteady equations with ferrohydrodynamics Kelvin force as a source term is discretized with PISO based finite volume method. Effects of the location of magnetic source and magnitude of current carrying from wire (1000, 2000, 3000, 4000 and 5000 amperes) are investigated on residence time and deposition level of drug on target tissue. Diameter and volume fraction of nanoparticles are 10 nm and 0.002, respectively. From the results, location of wire should be near and upstream the target tissue. Furthermore, by using this method deposition level of drug on target tissue can be increased by 7.5 times. Best drug delivery performance is seen for current magnitude of 2000 amperes.

---

Food security and its side effects is an issue that has directly or indirectly posed serious challenges to all countries in the world, especially developing countries such as Iran. Given the importance of nutrition and food consumption in household budget planning and the direct impact of prices on it, this article seeks to examine the effects of price shocks along with the nominal income compensation policy on household food security. To achieve this goal, four food groups are cereals (bread, rice and pasta), livestock products (red meat, white meat, dairy and eggs), and other agricultural products (potatoes, vegetables, fruits). Cereals and processed products (oil and sugar) were considered due to their high share in the household food basket.
Using the multi-market equilibrium model, the effects of price shocks of this group of products along with the nominal income compensation policy on the amount of calories received by households were evaluated separately for urban and rural income groups.
The results showed that the increase in income will lead the consumption pattern of poor households to consume more livestock products assuming the price of these products is stable and the consumption pattern of middle households to more consumption of agricultural products despite the increase in prices of these products. In this regard, the results showed that the sensitivity of poor households in the community, especially poor rural households to changes in income is very high. And increasing or decreasing the income of this group of households can play a decisive role in improving or weakening their food security. Therefore, it is suggested that the government men play an important role in supporting these households in the conditions of inflation in products and food, by granting subsidies and allocating the necessary funds to poor households, especially the rural poor. Due to the different influence of households with different income levels, it is necessary to establish the necessary support policies based on the income level of the household. Based on this, it is suggested to use support policies that are a combination of price and income policies for household consumption management.
 

---

---

Deficiency of potable water has created many problems for human and human society, Therefore, The production of fresh water from saline water is an important issue. One of the method of production fresh water from saline water is the use of solar stills. This paper is the numerical simulation of the conventional solar stills with setting Rectangular, Triangular, Wavy barriers on the left and right walls inside the solar still. Setting barriers causes a change in the pattern of humid airflow in the solar still that it affect water productivity and convective heat transfer rate. Also, changes in the size and number of barriers cause changes it will be in the result. The continuity, momentum, energy and concentration equations are discretized by finite volume method and the results are presented as flow function and concentration and temperature contours. The simulation results show that setting wavy barriers with A=0.01(m) and N=2 at left wall and A=0.075(m) and N=5 at right wall water productivity and convective heat transfer rate can be increased by about 31% and 31.34%.