Aims: Biodiesel is considered as a clean fuel, because it is free of any aromatic compound. In recent years, in order to reduce the cost of production of Biodiesel, many studies have been conducted on the extraction of biofuels from microalgae around the world. Thus, this study was conducted with the aim of investigating the feasibility of optimum temperature for growth of Nannochloropsis Oculata microalga by using image processing system.
Materials and Methods: In this experimental study, a piece of Nannochloropsis Oculata microalga containing 100,000 cells per ml was cultured in 15°C, 20°C, and 25°C. In order to evaluate the growth rate, active microalgae were sampled at 24-hour intervals, and their growth was studied, using machine vision systems. The data were analyzed, using Matlab 2012 and Weka 3 software by multivariable analysis of variance, linear regression algorithm, multilayer perceptron, Gaussian processing and simple linear regression analysis.
Findings: The maximum cell density of Nannochloropsis Oculata on the 8th day was 286.23×10⁴±0.38×10⁵ cells per ml in treatment at 25°C and the minimum cell density was 168.58×10⁴±0.48×10⁵ cells per ml in treatment at 15°C. Specific growth rate was significantly increased at temperature of 25°C compared to the treatments at 15°C and 20°C. Linear regression algorithms (r²=0.84), multilayer perceptron (r²=0.88) and Gaussian processing (r²=0.78) showed good results, but simple linear regression indicated that the algorithm was unsuccessful (r²=0.45).
Conclusion: The image processing technique provides a successful estimation of the growth process of Nannochloropsis Oculata at different temperature levels.

Due to the high demand of steel factories, the necessity of localization of mechanical laminar was introduced from Mobarakeh Steel Company of Isfahan. In this research, we first studied the working conditions and the extraction of the forces applied to the waterworks. The investigations showed that the forces are quasi-static and the pressure values are PH=225Pa and PGr=220Bar, and the torque TS=306.07N.m. The results of the tensile test showed that the final strength for the waterworks and belt was 620.3 and 594.1 MPa, respectively. In order to make the desired waterworks, the belt was prepared in 6 steps from the mold and formed a circular shape. Using the matrix pitch matrix, the staircase was created on the waterworks. The results of static analysis on the mechanical laminar and domestic laminar showed that the maximum stresses, based on Von Mises theory, were 1.39×10⁸ Pa and 3.2×10⁸ and the confidence coefficient for each was 2.808 and 1.338, respectively.