فصلنامه علوم و فناوری نساجی
سال دهم شماره 1 (بهار 1400)

In this study, it has been tried to examine the NCPAP cap for hospitalization of infants in the NICU ward and to examine the problems and inconveniences created for infants by using the observation tool, extracting problems and the quality of its various wards. Based on the basic-applied research method, all the effective variables in the design and comfort of this special hat were examined and action was taken to optimize, were upgraded and designed new hat. In order to achieve a more desirable result, all 70 staff of hospitals which have this Special Care Section in Yazd city, filled out a questionnaire and were evaluated by K-S, t-test and Friedman test on SPSS software. Based on the results, all variables in the questionnaire have a significant effect and are needed by nurses, so in four parts of the hat, including the attachment to the child's head, microjet section, were optimized using a new design, gender reassignment and hat shape were redesigned too. Finally, the designed hat reached the sewing stage and was sent to hospitals with a special ward for children in Yazd for approval. The sewn hat has been approved and is now available for use.

In this study, graphene plates were used to improve the antibacterial and electrical properties of cotton fabric. In this regard, graphite powder was converted to graphene oxide under chemical oxidation test and then converted to graphene oxide sheets by ultrasound and the colloidal solution was loaded on the surface of the fabric by immersion. The physical properties of graphene oxide-modified cotton fabric were evaluated by FTIR and scanning electron microscopy (SEM) methods, and the conductivity of the fabrics by standard methods of parallel electrodes and anti-scatters was also evaluated. Microbiology was examined. The results of SEM and FTIR microscopy images confirmed the presence of graphene oxide sheets, and finally the fabric coated with graphene oxide reduced by sodium hydrosulfite had electrical properties, which varied depending on the concentration of graphene oxide. Graphene oxide coated cotton fabric does not show electrical properties in the presence of other reducing agents. This operation also caused antibacterial properties on the surface of cotton cloth (to prevent the growth of bacteria such as S. aureus and E. coli).

One of the water pollutants is dyes that are widely used in the textile industry. The most important dye compound used in the textile industry is reactive dye. In this study, SBA-15/ZIF-8 nanocomposite was synthesized and used for the removal of reactive red 198 from aqueous solution. For approving the synthesized adsorbent structure, BET and transform infra-red spectroscopy (FT-IR) techniques were used. UV−Vis spectrophotometer was used to determine the amount of residual dye in solution. The effect of different experimental parameters such as pH, adsorbent dosage, contact time, initial dye concentration, and temperature on the adsorption were studied. The optimum condition were pH = 2, adsorbent dosage of 0.03 g, and contact time of 90 min at 25 °C. In the studies performed, it was found that with increasing temperature, the amount of adsorption decreased, which represents that the adsorption process of 198 reactive red dye on the synthesized adsorbent SBA-15 / ZIF-8 is exothermic.

Analyzing and managing consumer behavior has been one of the marketing management strategies. Considering the diversity and dynamics of sportswear consumers' behavior, the importance and influence of peer groups in the formation of shopping and consumption behaviors are very important. Therefore, in this study, the role of peer groups in stimulating immediate purchases and purchases, considering the mediating effects of positive emotions and shopping pleasure has been examined by structural equation analysis. This research was conducted with a descriptive survey in terms of applied purpose and its statistical population consists of consumers of sportswear in Yazd province that 297 people were surveyed as a sample using a questionnaire. The proposed conceptual model has been examined by structural equation analysis. Accordingly, Smart PLS 3 software was used in the data analysis stage. The results, while confirming all direct and indirect relationships in the model, showed that peer groups can increase the desire to buy and increase the speed of buying requests by creating a positive feeling and increasing shopping pleasure. Based on this, it is suggested that in sportswear advertisements, peer reference groups (such as classmates, teammates, etc.) be given more attention and focus on the manifestations of emotional effects and the pleasure of collective shopping.

At present, a large part of production costs and quality problems are related to design. Design for six sigma is a powerful approach for the design and development of products and services. The purpose of this research is to use design for six sigma to reduce the defects of spinning yarn. For this purpose, after examining the production line of spinning yarn, using Pareto diagram, the most important yarn defects were identified, which are: thick and thin. Then, the initial model was simulated and validated in Arena 14 software and the level of the existing process sigma was determined. In the next step, the optimization model was examined by this software. The research results show that the validated model can determine the optimal values well and significantly reduce the costs of performing multiple tests to reduce the amount of yarn defects. The results also showed a 1.55 unit improvement in the process sigma level.

Epoxy resins are one of the most important thermosetting polymers that applied in the industries of coatings, buildings, and high performance composite materials due to their physical , mechanical properties and good chemical resistance. Curing kinetics equations are used to optimized epoxy resins and epoxy nanocomposites and also, studying the kinetics of curing can increased the quality of the final product. Changes in the glass transition temperature can affected the conversion of the epoxy resin, and the presence of carbon nanofibers in the matrix helps to improved the crosslinking process. Adsorption of curing agent molecules into carbon nanofibers reduced the concentration of carbon nanofibers and also, surface modification of nanofibers reduced the activation energy and improved the curing rate. In this research, the effect of adding carbon nanofibers and modified carbon nanofibers on morphology and mechanical , rheological properties, activation energy, reaction rate, degree of curing, heat flow, and curing kinetics modeling has been investigated.