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This paper aims to demonstrate the efficiency and recombination improvement of Dye-sensitized solar cells (DSSCs) by introducing of a Nanodiamond (NDs)-TiO 2 nano composite. The main challenge in the proposed application is to find the optimal wt.% of ND in TiO 2. The experimental tests were conducted to compare the developed NDs/TiO 2 cell with one of pure TiO 2 nanoparticles prepared in the same conditions. It was observed that short circuit current density, power conversion efficiency, fill factor and electron life time enhanced with increasing ND content. The best performance was obtained with 1 wt.% ND content; with a current density of 12.11 mA/cm 2 and light-to-electricity conversion efficiency of 4.95%. The improvement in efficiency of 18.7% was obtained as the standard DSSC was compared with that of pure TiO 2. Keywords. Dye sanitized solar cells; nanodiamond / TiO 2 nano composite; charge carrier; electron life time; photovoltaic.

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nowadays, logo and arm detection with growing variety and number of arms in companies and countries is one of the significant topics in image processing .For logo detection there are many image processing algorithms which can be used for this purpose regard to features of the logo .In the most of recent works, images are exactly the logos, but in general, the logo can be one portion of another image or even can transform (rotate, skew, shift, …) and have more complexity .In this paper we will select Iran logo as a sample, because it has not any regular geometric form and has special complexity .In a bank of images we will try to find this logo and its position with its transformation .Images bank includes images that has not Iran logo or has Iran logo with affine transform within another pictures .Approaches that will be discussed here are pose clustering and momentum clustering .Simulation results show that this approach can be used as a suitable way for finding the existence and position of arm in this field.

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