Quarterly Scientific-Research Goljaam

The existing standards for measuring carpet properties consider carpet behavior after loading while its dynamic and instantaneous behavior is neglected. To investigate the dynamic behavior of under loading carpets, an INSTRON machine equipped with a developed system was used. The reliability of the system was verified by testing different materials. Different samples of hand-knitted carpet with 30, 40, 50, 60 and 70 Raj (rows/6.5cm), with specific structural and physical characteristic and raw material, were tested to obtain the curves of their pressure resistance versus time. The relation between features derived from the load/time curves and carpet structural and physical characteristics and raw materials were defined. Measuring the Pearson coefficient correlation, the linear correlations were studied and analyzed. The results indicate that with increase in knot density (Raj), the rate of decreasing thickness during loading, the resilience of carpet pile after loading, the total work exerted to carpet for reaching to jamming phase and the work returned by carpet during recovery phase decrease; while with increase in carpet thickness, the resilience and the total work increase. In addition, the load/time curves of different materials and hand-knitted carpets were compared. The similarities and differences between their behaviors were derived and the desirable compressibility behavior of a carpet is accordingly suggested.

In addition to medical recognition applications, X-ray CT-scan images are increasingly found to have more innovative and widespread applications. Due to the ability of producing high resolution and high contrast images from soft tissues with low attenuation coefficients, the usage of X-ray micro-focus source, which has a very small focal point (in the range of micrometer), plays an important role in those new applications. Since employing non-original knots in hand-knitted carpet reduces the carpet quality and the originality of knots cannot be visually recognized, in this research, a method has been introduced for recognition of the 3D structure of hand-knitted carpet using CT-scan images provided by micro-focus X-ray source. The images obtained by inverse Radon transform can even show the smallest units in the inner structure of the finest hand-knitted carpets. This method is a powerful device to recognize the originality, to inspect the structure and to study the impacts of different parameters on the structure of hand-knitted carpets and also for other applications which need scrutiny of 3D textiles.

needs of traditional producers. The cooperatives have been formed in Iran three decades ago. Continuation of the economic and social activities of these cooperatives depends on analyzing the ongoing problems. In this study, rural hand-made carpet cooperatives of Hamadan have been investigated. The main objectives of the study include analysis of weaknesses, threats, strengths and opportunities of the cooperatives and analysis of the strategies for strengthening these cooperatives with respect to the results of the pathology. The statistical population of the study includes all members of carpet cooperatives of Hamadan (923 persons) who were selected according to Cochran’s formula and 90 carpet weavers were randomly selected as statistical sample. The most important instrument for data collection was questionnaire. The validity of the questionnaire was confirmed by experts and its reliability was calculated using Cronbach’s Alpha coefficient (α=0.79). The analysis of SWOT was also used in this study. The results revealed that satisfaction of the design and new drawings for carpet that cooperative provide is their main strength, limitedness of the facilities of cooperative is their main weaknesses. Suitable position of Iranian carpet in the world is their important opportunity and carpet market volatility is the main threat of the cooperatives. At the end of the paper, four strategies have been offered.