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Zhao Jian,Nie Zheng,Zhou Jiangjun,Liao Dongfa,Liu Da 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.1
The purpose of this study was to assess the factors affecting caudal screw loosening after spinopelvic fixation for adult patients with spinal deformity. This meta-analysis calculated the weighted mean difference (WMD) and odds ratio (OR) using Review Manager ver. 5.3 (RevMan; Cochrane, London, UK). The loosening group was older than the control group (WMD, 2.17; 95% confidence interval [CI], 0.48–3.87; <i>p</i>=0.01). The S2 alar-iliac (S2AI) could prevent the caudal screw from loosening (OR, 0.43; 95% CI, 0.20–0.94; <i>p</i>=0.03). However, gender distribution (<i>p</i>=0.36), the number of fusion segments (<i>p</i>=0.24), rod breakage (<i>p</i>=0.97), T-score (<i>p</i>=0.10), and proximal junctional kyphosis (<i>p</i>=0.75) demonstrated no difference. Preoperatively, only pelvic incidence (PI) in the loosening group was higher (WMD, 5.08; 95% CI, 2.71–7.45; <i>p</i><0.01), while thoracic kyphosis (<i>p</i>=0.09), lumbar lordosis (LL) (<i>p</i>=0.69), pelvic tilt (PT) (<i>p</i>=0.31), pelvic incidence minus lumbar lordosis (PI–LL) (<i>p</i>=0.35), sagittal vertical axis (SVA) (<i>p</i>=0.27), and T1 pelvic angle (TPA) demonstrated no difference (<i>p</i>=0.10). PI–LL (WMD, 6.05; 95% CI, 0.96–11.14; <i>p</i>=0.02), PT (WMD, 4.12; 95% CI, 0.99–7.26; <i>p</i>=0.01), TPA (WMD, 4.72; 95% CI, 2.35–7.09; <i>p</i><0.01), and SVA (WMD, 13.35; 95% CI, 2.83–3.87; <i>p</i>=0.001) were higher in the screw loosening group immediately postoperatively. However, TK (<i>p</i>=0.24) and LL (<i>p</i>=0.44) demonstrated no difference. TPA (WMD, 8.38; 95% CI, 3.30–13.47; <i>p</i><0.01), PT (WMD, 6.01; 95% CI, 1.47–10.55; <i>p</i>=0.01), and SVA (WMD, 23.13; 95% CI, 12.06–34.21; <i>p</i><0.01) were higher in the screw loosening group at the final follow-up. However, PI–LL (<i>p</i>=0.17) demonstrated no significant difference. Elderly individuals were more susceptible to the caudal screw loosening, and the S2AI screw might better reduce the caudal screw loosening rate than the iliac screws. The lumbar lordosis and sagittal alignment should be reconstructed properly to prevent the caudal screw from loosening. Measures to block sagittal alignment deterioration could also prevent the caudal screw from loosening.
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Promotional effect of Ce in NH3-SCO and NH3-SCR reactions over Cu-Ce/ SCR catalysts
Wenjie Liu,Yifei Long,Shinian Liu,Yongyan Zhou,XinTong,Yajie Yin,Xiaoyi Li,Kang Hu,Jiangjun Hu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Commercial V-W-Ti catalysts were modified with Cu and different contents of Ce to remove slip ammoniaand remaining nitrogen oxide from the end stage of SCR technology. The activities of NH3 oxidation byO2 (NH3-SCO) and NO reduction by NH3 (NH3-SCR) of these catalysts were examined from 150 to 400 ℃. The consequences indicated that the addition of Ce and Cu could considerably enhance NH3 oxidation andNO reduction capacity of the catalysts and Ce was conducive to reduce the detrimental effects of H2O andSO2. The characterization tests indicated that the surface active oxygen increased because of the interactionbetween V, Cu and Ce. Moreover, the loaded Ce and Cu contributed to enhance the surface acidityand redox property of SCR catalysts.
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Peng, Xu,Yu, Le,Gong, Kaiyue,Liu, Xiaohan,Yang, Guolong,Xu, Jiangjun,Zhou, Chao,Gao, Lixia,Zhu, Xinyu The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8
An aircraft ground power unit (GPU) can replace the auxiliary power unit (APU) in an aircraft while the aircraft is parked at an airport. Therefore, the problems associated with the oil consumption and air pollution of the APU are solved. However, the GPU is faced with challenges in terms of utilization, power quality, and fault tolerance. Thus, a novel centralized aircraft GPU based on a three-level neutral point clamped cascaded converter (3LNPC-CC) is introduced in this paper to improve utilization and power quality. Furthermore, an evaluation voltage balance strategy is proposed for the DC-port fault tolerance of the 3LNPC-CC. In addition, both the modulation of the phase shift pulse width modulation (PSPWM) and the control of the double closed loop are used in the 3LNPC-CC. A simulation platform including the control, modulation, and fault tolerance of the system is established to verify the feasibility and performance of the proposed GPU. In particular, it is used to evaluate the voltage balance strategy for DC-port faults. Moreover, a prototype of the GPU and relevant experiments are completed to verify the correctness and feasibility of the system and the strategy.
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