Showing 6 results for Akbari
Dr. Ahmad Akbari,
Volume 2, Issue 2 (6-2006)
Abstract
New nanofiltration membranes were produced in the form of unfilled fibers through the photopolymerization method. Parastyrene sodium sulfonate was used as the vinyl monomer to reform the polysulphone ultra-filtration membranes. The modified membranes were used to purify colored solutions of three different pigments consisting acidic, reactive and direct (suitable for dyeing pile yarns and warps), in order to refine and reuse the pigment solutions. The effect of various parameters like pressure, electrolyte, time, and the kind of pigment on the extent to which the pigment is confined and the flux of the membrane outflow was assessed. Results showed that besides the effective function of bleaching, the problem of barred pores observed in most commercial membranes built of polyamide also reduced significantly in the new membranes.
Mr Abbas Akbari,
Volume 3, Issue 6 (9-2007)
Abstract
variety of western carpet designs such as Bahaus School are characterized as different from the traditional designs and forms and are basically based on principles of visual arts. This variety pops up questions about the origin, causes, and relationship with oriental carpets. This paper is an attempt to answer some of these questions. To this end, history of western carpet by looking at art movements such as “William Morris Movement”, “Bauhaus School”, “Art Deco”, “Art Noveau”, and “Post-modern art”.
Mrs Robabeh Taghizadeh Borujeni, Dr Ahmad Akbari, Mr Abdolsalim Gharehbaii,
Volume 11, Issue 28 (3-2016)
Abstract
Today, much research is conducted on the use of new methods of dyeing textiles, all of which are trying to select an appropriate method of reducing the usage of energy and chemicals in a way to produce cost-effective products with an acceptable uniformity. One of these methods is the use of ultrasonic waves. Since the dyestuff is extremely limited by the plant cell membrane, extraction methods such as ultrasonic ones can better improve the mechanism of extracting natural dyes and dyestuff out of cell membranes and also improve the transfer of dyestuff onto fibers’ dyeing process in order to assist in conservation of natural resources,
The aim of this study is to use ultrasonic waves in the extraction of dyestuff of walnut shell and to dye wool fibers with the extract. Favorable results are obtained compared to conventional screw. By calculating the absorption efficiency with conventional ultrasound method, it was concluded that the use of ultrasonic waves can increase the concentration of the dye in solution more than the conventional method and by increasing the concentration of the dye in both methods, this factor is increased. According to the findings, it is concluded that ultrasonic extraction method is more efficient than the usual one. To investigate the effects of ultrasonic method in the dyeing process, the productivity of ultrasonic method in dyeing was calculated in relation to conventional method in two modes of (UU) and (UC). The productivity of (UU) in relation to (UC) was % 13/77. Various mechanical aspects are included to achieve the positive effect of the use of ultrasonic waves in dyeing process such as degassing of fiber, stimulation of dyeing solution, rapid spread of dyestuff on fiber and breaking the gathering of dyeing molecules. These cause a higher influence of the dyestuff in the fibers and a sheer deep dye. Measurement of stabled samples results show that the stability of the samples in both ultrasonic and conventional methods, has been fair to good. The results of the SEM analysis clearly presents this conclusion. Creating a kind of surface erosion and degradation scales, which led to greater influence and power of color dye into the fiber, increases the effects of cavitation. They are considered to be seen in the SEM images.
Dr Hasan Akbari, Mrs Helen Nakhustin Khayat, Mr Armin Nakhustin Khayat,
Volume 13, Issue 32 (autumn and winter 2018)
Abstract
In Islamic culture, "garden" is a manifestation of heaven in appearance, So the carpet and garden are the mirrors of heaven. In this research, the design patterns of Iranian garden and garden carpets in Safavid and Qajar period are identified and compared with each other. The goal of this research is to investigate the interactions of form, geometry and patterns of design in garden carpet and Iranian garden. In this research, the effects of the dominant elements and characcteristics such as architectural and natural elements, motifs, forms and design principles, in Isfahan “Chehelsoton” garden", Kashan "Fin” garden, Mahan "Shahzadeh” garden" and Shiraz "Jannat” garden" are surveyed and compared with 12 samples of garden carpets belonging to the 16th , 17th and 18 th centuries. The result of the research is that, the design of Iranian gardens and garden carpets have some principles in common, inspiring and affecting each other. Gardening pattern in "Fin" ," Shahzadeh" ,"Chehelsoton" and "Jannat” gardens are closely similar to each other. Based on the results of the research, the most indices of Iranian Gardens are found in "Fin" with 81.5 percent, "Chehelsoton" &,"Shahzadeh" with 74 percent and "Jannat" with 66.6 percent which accordingly have the most effects on garden carpet design patterns. Also, "Bage Behesht" carpet (carpet No. 3) has the most accordance and "Garden Rug" (carpet No. 12) has the least harmony with characteristics and indices of Iranian gardens.
Ms Akhtar-Alsadat Mousavi, Ahmad Akbari, Hassan Khatami,
Volume 14, Issue 34 (3-2019)
Abstract
One of the problems of natural yellow dyes (weld) is their low stability against light and their high fading rate. One of the main destructive factors in pale of color fibers and hand-woven carpet is the high-energy ultraviolet radiation which causes chemical bonds to break and optically damages of organic structures. In this study, the effect of some antioxidants (gallic acid, ascorbic acid) and conventional UV absorbents, (2- hydroxy benzophenone as a supplement agent is studied in order to improve light fastness property. The effect of light fastness variables such as exposure time, antioxidants concentration, relative humidity were optimized. Afterward, the obtained changes were compared with the original sample and were stated in terms of ΔE color change value. The results showed that in all cases, the use of UV absorbents or antioxidants relatively improves light stability properties of the samples. The best result in increasing light stability was observed in using gallic acid.
Golsum Akbari Arbatan, Rasoul Abbasi,
Volume 15, Issue 36 (3-2020)
Abstract
In recent years, the wave of economic sanctions has overshadowed Iran's economy with the aim of reducing the financial power, national welfare and disbelief, and a new confrontation has opened up on the Iranian economy. With respect to special importance and role of carpet weaving and its place in the country's economy, identifying and studying the recent problems of hand-made carpet weavers along with economic sanction is essential. The purpose of this research is to formulate and validate a conceptual framework via thematic analysis through descriptive in-depth semi-structured interviews. The statistical population includes carpet weavers in Arbatan city in East Azarbaijan province, among whom 20 carpet weavers were selected by purposeful sampling and participated in this study. The findings show that the challenges in four main themes include individual challenges, production and sales challenges and administrators challenges and 33 sub-themes. Finally, according to the results of the research, suggestions have been made like the development of low-cost supportive financial facilities, systematization and organization of in-country raw material processing mechanisms and appropriate advertising in global markets to solve carpet weaving problems.
