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Xianzhe Shi,Xiuxia Wang,Biao Chen,Junko Umeda,Katsuyoshi Kondoh,Jianghua Shen 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
In this work, a bimodal grain structure was developed for commercial purity Ti(CP-Ti) via powder metallurgy processing,followed by free hot forging and then heat treatment. The bi-modal grains were characterized with electron backscatterdiffraction. The mechanical tests showed that in comparison to the uniform and equiaxed grain structure, the bimodalgrains improved the yield strength of CP-Ti significantly, while it maintains a merely changed ultimate tensile strength andelongation to failure. In addition, an interesting yield plateau was observed in the bimodal CP-Ti. To explore underlyingmechanisms behind the phenomenon, the microstructures of the samples before and after testing were carefully examined. The results revealed that geometrically necessary dislocations accumulating at the interface between coarse and fine grainsinduced back stress hardening, which together with the statistically stored dislocations also accounted for the yield plateauin the bimodal CP-Ti.
Poisoning effect of CaO on CeO2/TiO2 catalysts for selective catalytic reduction of NO with NH3
Ye Jiang,Xuechong Wang,Changzhong Bao,Shanbo Huang,Xiuxia Zhang,Xinwei Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
The effect of CaO on CeO2/TiO2 catalysts prepared by a single step sol-gel method for selective catalytic reduction of NO with NH3 was investigated. The results showed that CaO could severely deactivate the CeO2/TiO2 catalysts. Based on the characterization results obtained by BET, XRD, XPS, H2-TPR and NH3-TPD, the deactivation by CaO of CeO2/TiO2 catalysts should be attributed to pore blockage, lower concentration of Ce on catalyst surface, reduction of Ce3+ and surface adsorbed oxygen, degradation of redox ability and decrease in NH3 adsorption capacity. The theoretical DFT results demonstrated that Ca atom could strongly interact with cerium oxygen, which inhibits the formation and hydrogenation of oxygen vacancies on catalyst surface.
Ketogenic Diet in Infants with Early-Onset Epileptic Encephalopathy and SCN2A Mutation
Xiaoyu Tian,Yange Zhang,Jinhong Zhang,Yan Lu,Xinyi Men,Xiuxia Wang 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.4
Research has shown mutations in the voltage-gated sodium channel gene SCN2A to be associated with developmental delaysand infantile seizures in patients with early-onset epileptic encephalopathies (EOEEs). Here, we report the case of an infant witha de novo SCN2A mutation with EOEE who had medically refractory seizures that improved with a ketogenic diet (KD) implementedat an age less than 2 months. On the day of his birth, the infant presented with a pattern of convulsions with dozens ofepisodes per day. An initial video electroencephalogram revealed poor reactivity of background activity, with multiple partial episodesstarting from the right temporal region, and abnormal electrical activity in the right hemisphere. The seizures previouslywere not controlled with successive therapy with phenobarbital, topiramate, and levetiracetam. Genetic testing revealed the presenceof a mutation in the SCN2A gene (c.4425C>G, p.Asn1475Lys). The infant’s seizures decreased significantly with a combinationof KD and medication. The present case exemplifies the potential for personalized genomics in identifying the etiology of anillness. Furthermore, the KD appears to feasible in infants younger than 2 months and might elicit good responses to EOEE associatedwith SCN2A mutation.