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Jonas Van Belleghem,Jia Yang,Pieter Janssens,Jeroen Poissonnier,De Chen,Guy B. Marin,Joris W. Thybaut 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
A Single-Event MicroKinetic (SEMK) model has been extended towards the simulation of Steady StateIsotopic Transient Kinetic Analysis (SSITKA) data for Co catalyzed Fischer-Tropsch Synthesis (FTS). Theextended model considers two types of sites and both direct and H-assisted CO dissociation. Regression of the model parameters to the data obtained from 17 steady state and 11 SSITKA experimentsresulted in physicochemically meaningful estimates for the activation energies and atomic chemisorptionenthalpies. The application of the phenomenological UBI-QEP method allows to physically interpret thenature of the two site types considered in the model, i.e., terrace and step sites. A reaction path analysisshows that over 80 percent of the CO reacts on the step sites. Furthermore, chain growth exclusivelyoccurs on these sites. The terrace sites are less reactive for CO dissociation and are identified as responsiblefor methane production. A fraction of the alkenes, produced on the step sites, is hydrogenated toalkanes on the terrace sites. Based on model simulations, the metal particle size effect, i.e., a lowerTOF, higher methane selectivity and increasing alkane to alkene ratio with decreasing metal particle size,is attributed to an increasing relative importance of the terrace sites on the reaction kinetics.
Kappen, Isabelle Francisca Petronella Maria,Bittermann, Dirk,Janssen, Laura,Bittermann, Gerhard Koendert Pieter,Boonacker, Chantal,Haverkamp, Sarah,de Wilde, Hester,Van Der Heul, Marise,Specken, Tom F Korean Society of Plastic and Reconstructive Surge 2017 Archives of Plastic Surgery Vol.44 No.3
Background No consensus exists on the optimal treatment protocol for orofacial clefts or the optimal timing of cleft palate closure. This study investigated factors influencing speech outcomes after two-stage palate repair in adults with a non-syndromal complete unilateral cleft lip and palate (UCLP). Methods This was a retrospective analysis of adult patients with a UCLP who underwent two-stage palate closure and were treated at our tertiary cleft centre. Patients ${\geq}17$ years of age were invited for a final speech assessment. Their medical history was obtained from their medical files, and speech outcomes were assessed by a speech pathologist during the follow-up consultation. Results Forty-eight patients were included in the analysis, with a mean age of 21 years (standard deviation, 3.4 years). Their mean age at the time of hard and soft palate closure was 3 years and 8.0 months, respectively. In 40% of the patients, a pharyngoplasty was performed. On a 5-point intelligibility scale, 84.4% received a score of 1 or 2; meaning that their speech was intelligible. We observed a significant correlation between intelligibility scores and the incidence of articulation errors (P<0.001). In total, 36% showed mild to moderate hypernasality during the speech assessment, and 11%-17% of the patients exhibited increased nasalance scores, assessed through nasometry. Conclusions The present study describes long-term speech outcomes after two-stage palatoplasty with hard palate closure at a mean age of 3 years old. We observed moderate long-term intelligibility scores, a relatively high incidence of persistent hypernasality, and a high pharyngoplasty incidence.
Isabelle Francisca Petronella Maria Kappen,Dirk Bittermann,Laura Janssen,Gerhard Koendert Pieter Bittermann,Chantal Boonacker,Sarah Haverkamp,Hester de Wilde,Marise Van Der Heul,Tom FJMC Specken,Ron K 대한성형외과학회 2017 Archives of Plastic Surgery Vol.44 No.3
Background No consensus exists on the optimal treatment protocol for orofacial clefts or the optimal timing of cleft palate closure. This study investigated factors influencing speech outcomes after two-stage palate repair in adults with a non-syndromal complete unilateral cleft lip and palate (UCLP). Methods This was a retrospective analysis of adult patients with a UCLP who underwent two-stage palate closure and were treated at our tertiary cleft centre. Patients ≥17 years of age were invited for a final speech assessment. Their medical history was obtained from their medical files, and speech outcomes were assessed by a speech pathologist during the followup consultation. Results Forty-eight patients were included in the analysis, with a mean age of 21 years (standard deviation, 3.4 years). Their mean age at the time of hard and soft palate closure was 3 years and 8.0 months, respectively. In 40% of the patients, a pharyngoplasty was performed. On a 5-point intelligibility scale, 84.4% received a score of 1 or 2; meaning that their speech was intelligible. We observed a significant correlation between intelligibility scores and the incidence of articulation errors (P<0.001). In total, 36% showed mild to moderate hypernasality during the speech assessment, and 11%–17% of the patients exhibited increased nasalance scores, assessed through nasometry. Conclusions The present study describes long-term speech outcomes after two-stage palatoplasty with hard palate closure at a mean age of 3 years old. We observed moderate long-term intelligibility scores, a relatively high incidence of persistent hypernasality, and a high pharyngoplasty incidence.