Rural labour market disequilibrium might become more critical in the next few year. This is, on the one hand, due to an increase in the supply of labour force which itself is the result of low population average age and high level of education, as well as high rate of inflation. On the other hand it is the result of low demand for the rural labour due to the inability of agricultural sector to creat employment opportunities. In this study supply of the rural labour force was assumed as a function of educational coverage, agricultural value added, rural unemployment rate, consumer price index, rate of higher education and rate of urbanization. The result of study revealed that annual average increase in the rural labour force would be 125000 persons. In order to lower the unemployment rate from 15.7 % to 9.4 % by the end of the third development plan, creation of 200000 new job opportunities is required. The result of study also indicated that creation of 71000 new job opportunities annually would lead to an unemployment rate of 16.8 percent. Inability to create sufficient job opportunities would lead to the migration of the rural unemployed to the urban areas. To avoid the social costs of this event, the proper labour force policies should carefully focus on the shortcomings of the prevailing rural labour market in Iran.

Water scarcity is one of the most important bottleneck in the development of agricultural sector of Iran. So, irrigation efficiency improvement strategies could be among the best solution to increase water productivity of this sector. In the process of mechanization, the rate of capital investment and efficiency increases in comparison with the level of labour force. So extension of mechanization in the regions that are faced with lake of labour force is reasonable. Replacing modern irrigation methods for conventional ones increase the efficiency of labour force. In Iran which is a dry country this may be reasonable but in relation to labour force the area's condition must be considered too. In this study, the effect of adoption of water saving technology on the level of labour requirements is considered. Therefore the result of this study could be used for policy recommendation.A sample of 115 producers was selected by two stage stratified random sampling method and interviewed. Using Multiperiod Mathematical Programming method, two models were built for study farmers. The studies assumptions and goals were tested with the use of these models. The results indicated that in dry condition which the extension of the areas under cultivation is probable the extension of water saving methods may cause the rate of employment and requests for farming labour force to increase. This can bring more lands into cultivation. So, demand for labour may increase.

Injection mould design is a complex task which consisits of different fields of knowledge such as solid modelling, polymer science and flow and solid mechanics.Therefore a comprehensive and efficient system of computer aided mould design, is still somehow far from reality. In this paper, an' attempt is made to determine the parting surfaces in injection moulds by the use of "CAD" and "IGES"; a standard tool for graphics data exchange Besides a flowchart is developed to show a typical procedure for finding the set of definition points on the parting line of parts. Determining the parting lines and surfaces are the most critical elements in injection mould design which have the most profound effects on the mould design and subsequent operation.