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Muslin Deweaving through Combined Mechanical, Thermal and Chemical Methods
Hang Zhang Cao,Jamie DeCoster,Jamie DeCoster,Kelvin Linskens,Kareem Mehdi,Yizhi Meng,Gary Halada,Hye-Jung Jung,Theanne Schiros,Asta Skocir,Taejin Kim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Fabric waste has become an escalating problem that stems from the ever-shortening clothing lifecycle. Previouscotton recycling processes used mechanical methods to break the cotton down into fiber; this comes at the cost ofcompromised strength. Sodium hydroxide has long been used in the textile industry to increase dye absorption and lusterthrough mercerization. In this paper, the deweaving of cotton muslin fabric was attempted using the chemical interactions ofNaOH in combination with heat and mechanical forces through agitation. Different NaOH concentrations were tested todetermine the optimum condition for fabric decomposition on a laboratory scale. Overall, the muslin fabric treatment with0.5 M NaOH yielded the most promising results for fiber quality retention and chemical usage. The NaOH solution wasshown to be feasible in effectively deweaving multiple muslin fabrics consecutively. While the deweaving process reducesthe mechanical strength of the fabric, overall, the recycling method was successful in minimizing chemical waste anddeweaving time.
Ranjini Srinivasan,Jennifer A. Faerber,Grace DeCost,Xuemei Zhang,Michael DiLorenzo,Elizabeth Goldmuntz,Mark Fogel,Laura Mercer-Rosa 한국심초음파학회 2022 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.30 No.1
BACKGROUND: Little is known regarding right ventricular (RV) remodeling immediately after Tetralogy of Fallot (TOF) repair. We sought to describe myocardial deformation by cardiac magnetic resonance imaging (CMR) after TOF repair and investigate associations between these parameters and early post-operative outcomes. METHODS: Fifteen infants underwent CMR without sedation as part of a prospective pilot study after undergoing complete TOF repair, prior to hospital discharge. RV deformation (strain) was measured using tissue tracking, in addition to RV ejection fraction (EF), volumes, and pulmonary regurgitant fraction. Pearson correlation coefficients were used to determine associations between both strain and CMR measures/clinical outcomes. RESULTS: Most patients were male (11/15, 73%), with median age at TOF repair 53 days (interquartile range, 13,131). Most patients had pulmonary stenosis (vs. atresia) (11/15, 73%) and 7 (47%) received a transannular patch as part of their repair. RV function was overall preserved with mean RV EF of 62% (standard deviation [SD], 9.8). Peak radial and longitudinal strain were overall diminished (mean ± SD, 33.80 ± 18.30% and −15.50 ± 6.40%, respectively). Longer hospital length of stay after TOF repair was associated with worse RV peak radial ventricular strain (correlation coefficient (r), −0.54; p = 0.04). Greater pulmonary regurgitant fraction was associated with shorter time to peak radial RV strain (r = −0.55, p = 0.03). CONCLUSIONS: In this small study, our findings suggest presence of early decrease in RV strain after TOF repair and its association with hospital stay when changes in EF and RV size are not yet apparent.