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Kai Huang,Sheng Lin,Jiejie Wang,Zhenghong Luo 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Ferrite catalysts with high intraparticle pore volume and surface area are frequently used in theoxidative dehydrogenation of butylene. Whether the non-inclusion of intraparticle transfer limitation infixed-bed reactors for oxidative dehydrogenation over ferrite catalysts in previous studies is appropriateremains unclear. In this study, we attempt to verify this process using a multi-scale modelingtechnology. The multi-scale model consists of a porous medium model and a single particle model underthe oxidative dehydrogenation condition. This model can predict the influences of intraparticle transferon the main component distributions in reactors and demonstrate that the intraparticle transferlimitation is obvious.
Yuesong Pan,Zixiao Li,Jiejie Li,Aoming Jin,Jinxi Lin,Jing Jing,Hao Li,Xia Meng,Yilong Wang,Yongjun Wang 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.1
Background and Purpose: Despite administration of evidence-based therapies, residual risk of stroke recurrence persists. This study aimed to evaluate the residual risk of recurrent stroke in acute ischemic stroke or transient ischemic attack (TIA) with adherence to guideline-based secondary stroke prevention and identify the risk factors of the residual risk. Methods: Patients with acute ischemic stroke or TIA within 7 hours were enrolled from 169 hospitals in Third China National Stroke Registry (CNSR-III) in China. Adherence to guideline-based secondary stroke prevention was defined as persistently receiving all of the five secondary prevention medications (antithrombotic, antidiabetic and antihypertensive agents, statin and anticoagulants) during hospitalization, at discharge, at 3, 6, and 12 months if eligible. The primary outcome was a new stroke at 12 months. Results: Among 9,022 included patients (median age 63.0 years and 31.7% female), 3,146 (34.9%) were identified as adherence to guideline-based secondary prevention. Of all, 864 (9.6%) patients had recurrent stroke at 12 months, and the residual risk in patients with adherence to guidelinebased secondary prevention was 8.3%. Compared with those without adherence, patients with adherence to guideline-based secondary prevention had lower rate of recurrent stroke (hazard ratio, 0.85; 95% confidence interval, 0.74 to 0.99; P=0.04) at 12 months. Female, history of stroke, interleukin- 6 ≥5.63 ng/L, and relevant intracranial artery stenosis were independent risk factors of the residual risk. Conclusions: There was still a substantial residual risk of 12-month recurrent stroke even in patients with persistent adherence to guideline-based secondary stroke prevention. Future research should focus on efforts to reduce the residual risk.
Mineral behavior of low-temperature lignite ashes under gasification atmosphere
Yitian Fang,Fenghai Li,Jiejie Huang,Yang Wang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
To investigate the mineral behavior of lignite ashes under gasification conditions, 450 oC Xiaolongtan lignite ash samples (XLT-LTA) treated at different temperatures or pressures under reducing atmosphere (H2/CO2=1 : 1, volume ratio) have been examined by means of an SC-444 apparatus, a scanning electron microscope with an energy dispersive X-ray detector (SEM-EDX), and by X-ray diffraction (XRD). The results showed the sulfur content in the XLT-LTA to be much higher than that in ashes prepared at 815 oC, as a result of the release of sulfur dioxide during the oxidization of pyrite. With increasing temperature, the XLT-LTA particles gradually agglomerate and form partially molten surface entities with obvious apertures, and the content of iron and calcium in the congeries or molten parts increases due to the fusion of fine ash particles with the enrichment of iron and the formation of low-temperature eutectics of calcium and iron. An increase of pressure restrains the decomposition of calcite and muscovite, and promotes the formation of iron minerals (e.g., hercynite, cordierite, and sekaninaite) and orthoclase. The content of amorphous material also increases with increasing pressure.