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RISS 인기검색어
- 검색키워드
- 저자 : Mahdi Safi (검색결과 4 건)
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Mahdi Safi,Fahime Gheisar,Farhood Najafi,Behzad Shirkavand Hadavand 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
This study aimed to investigate the capability of two silicon-based resins, namely Polydimethylsiloxane (PDMSiA) and Poly (dimethyl/diphenyl siloxane) modified with amino groups (PDMDPhSiA), to induce a visible shade-darkening effect when applied as finishing agents on black-dyed polyester and cotton fabrics. The process involved the utilization of deepening agents with a low refractive index to achieve this visual darkening effect. The analysis encompassed several aspects. FTIR spectroscopy was employed to characterize the chemical structure of the synthetic products. The refractive indexes were quantified using the Swaneopeol method. To gauge the effectiveness of the treatment, the color depth of the treated fabrics was assessed using parameters such as color yield (K/S) and the ratio of the difference in lightness (DL*) to the overall color difference (ΔEab*). Moreover, the study delved into the fastness properties of the dyed fabrics after the finishing process. Comparatively, the results highlighted that the use of PDMSiA resin led to an enhanced color depth in the finished fabrics, outperforming the effects of PDMDPhSiA resin. The evaluation of color fastness demonstrated significant improvements across the board, with all samples achieving a grade of 5 or higher. The study determined that the optimal conditions for applying both resins involved a concentration of 20%, a pick-up rate of 85%, and a curing temperature of 180 °C. These conditions yielded the most favorable outcomes in terms of achieving the desired shade-darkening effect on the dyed fabrics.
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Safi, Yaser,Kadkhodazadeh, Mahdi,Safai, Pooria,Esmaeelinejad, Mohammad,Shamloo, Nafiseh Korean Academy of Periodontology 2014 Journal of Periodontal & Implant Science Vol.44 No.5
Purpose: This study aimed to assess the interdental bone level in premolar bitewing radiographs while retracting the cheeks. Methods: Seventy-two horizontal bone defects were created on dried mandibles and maxillae. The distance from the bone level to the cement-enamel junction of premolars was detected by a modified digital caliper (considered the gold standard). The reliability of all radiographs was assessed by intraclass correlation coefficient (ICC), and the validity was compared to the gold standard using the analysis of variance test. P-values less than 0.05 were considered statistically significant. Results: This study showed that the reliability of radiographs without a cheek simulator and with 0.16 second exposure time was significantly higher than that of the two other groups (ICC=0.96 compared to 0.93 and 0.88, respectively). The results from the radiographs without a cheek simulator and with 0.16 second exposure time were more similar to the gold standard measures than those of the two other groups, although the difference was not statistically significant. Conclusions: Retracting the buccal soft tissue plays an important role in increasing the accuracy of radiographs in detecting the interdental alveolar bone level and produces more accurate results than increasing the exposure time, although it does not have a significant role in reliability of results.
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Yaser Safi,Mahdi Kadkhodazadeh,Pooria Safai,Mohammad Esmaeelinejad,Nafiseh Shamloo 대한치주과학회 2014 Journal of Periodontal & Implant Science Vol.44 No.5
Purpose: This study aimed to assess the interdental bone level in premolar bitewing radiographswhile retracting the cheeks. Methods: Seventy-two horizontal bone defects were created on dried mandibles and maxillae. The distance from the bone level to the cement-enamel junction of premolars wasdetected by a modified digital caliper (considered the gold standard). The reliability of allradiographs was assessed by intraclass correlation coefficient (ICC), and the validity wascompared to the gold standard using the analysis of variance test. P-values less than 0.05were considered statistically significant. Results: This study showed that the reliability of radiographs without a cheek simulatorand with 0.16 second exposure time was significantly higher than that of the two othergroups (ICC=0.96 compared to 0.93 and 0.88, respectively). The results from the radiographswithout a cheek simulator and with 0.16 second exposure time were more similar tothe gold standard measures than those of the two other groups, although the differencewas not statistically significant. Conclusions: Retracting the buccal soft tissue plays an important role in increasing the accuracyof radiographs in detecting the interdental alveolar bone level and produces moreaccurate results than increasing the exposure time, although it does not have a significantrole in reliability of results.
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Mohammad Reza Shahparvari,Mahdi Safi,Siyamak Safapour,Kamaledin Gharanjig 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
In the present research, a method of assessing relative compatibility rating of single and binary mixtures of walnut green shell, cochineal, and weld natural dyes on aluminum pre-mordanted woolen yarns was proposed, where a proportion of the calculated diffusion coefficients of dyes was postulated. To calculate the diffusion coefficient values, the uptake behavior of dyes was derived as the K/S and the exhaustion curves by dyeing the woolen yarn samples with the individual dye as well as with the mixtures of dyes obtained from practical conditions of dyeing. A typical method was employed to dye the samples at two temperatures of 80 and 95 oC. The method proposed for determination of the compatibility of dyes was more verified at higher temperature, that is, 95 oC, against a conventional method of solution analysis. The results of compatibility showed that the selected binary mixtures of cochineal-weld have an excellent compatibility. The other mixtures, that is, walnut green shell-cochineal and walnut green shell-weld showed weak-moderate and very weak compatibility, respectively.
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