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Wenhao Ding,Qitai Eri,Bo Kong,Changsheng Wang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
The compact tube heat exchanger located behind the air-intake can achieve quick cooling of high-temperature air to ensure the normal operation of the pre-cooled aeroengine. It has great impact on the engine’s performance. The total pressure distribution at the heat exchanger inlet is inevitably uneven due to the influence of the air-intake. This paper studies the effect of three typical inlet distortions with different amplitudes using porous model and dual cell model. The results indicated that the outlet total pressure distortion is not sensitive to the inlet total pressure distortion. However, it affects the total pressure recovery and the total temperature distortion at the outlet by altering the pressure loss in the heat exchanger upstream and the flux distribution at the heat-transfer-zone entrance, respectively. This leads to a reduction of heat transfer. The effect of inlet distortions varies with distortion type. And it becomes more severe with increasing distortion.
Isoperistaltic side-to-side anastomosis for the surgical treatment of Crohn disease
Wenhao Chen,Junjie Zhou,Min Chen,Congqing Jiang,Qun Qian,Zhao Ding 대한외과학회 2022 Annals of Surgical Treatment and Research(ASRT) Vol.103 No.1
Purpose: Increasing evidence has shown an association of surgical technique, particularly anastomotic configuration, with postoperative recurrence of CD. This pilot study aimed to evaluate short-term outcomes of isoperistaltic side-to-side anastomosis (ISSA) employed on Crohn disease (CD) patients. Methods: Data were retrieved from a prospectively maintained database. Postoperatively, all patients were followed up with close endoscopic (ileocolonoscopy) surveillance. Results: From January 2017 to May 2021, 30 patients diagnosed with CD who underwent ISSA were compared with 45 CD patients who underwent antiperistaltic side-to-side anastomosis (ASSA). The 2 groups were comparable in baseline demographics and clinical characteristics. No significant differences were observed between groups regarding postoperative safety issues, including anastomotic leak, abdominal/pelvic abscess, length of hospital stay, readmission rate within 30 days, etc. At postoperative 24th month, reduced endoscopic recurrence was observed in the ISSA group compared with that in the ASSA group (18 of 24, 75.0%, . 36 of 38, 94.7%; P = 0.024). Regarding surgical recurrence, there was 0% in the ISSA group . 4.4% (2 of 45) in the ASSA group (P = 0.510). Conclusion: In this study, we aimed to explore the influence of ISSA on postoperative recurrence in CD patients, and the preliminary results show that ISSA was technically safe and feasible, and appears to be effective in reducing postoperative recurrence in CD patients. However, our conclusion was underpowered due to small sample size and inadequate follow- up. We proposed ISSA be considered as another alternative option in the toolbox of inflammatory bowel disease surgeons when performing anastomosis on CD patients.
Tianpeng Yu,Lixi Wang,Xiaojuan Yang,Wenhao Ding,Qitu Zhang 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
In this paper, green-blue emitting Sr 2 SiO 4 (SSO):0.03Tb 3+ , x Ce 3+ ( x = 0–0.005) materials were synthesized via a solid-statereaction method. The crystal structures, luminescence properties, decay time, and thermal stability were measured in thiswork. The as-prepared phosphors exhibit both an indigo emission of Ce 3+ and green emission of Tb 3+ with considerableintensity ( λ ex = 300 nm). Tb 3+ ion emission was intensifi ed obviously with co-doping Ce 3+ . The luminescence spectra ofSr 2 SiO 4 (SSO):0.03Tb 3+ , Ce 3+ shows characteristic line of Tb 3+ ion transition ( 5 D 4 → 7 F 5 ). Tunable green-blue color canbe obtained by the addition of Ce 3+ ions. An eff ective energy transfer process between Tb 3+ and Ce 3+ was supposed andconfi rmed from decay curves. In addition, the energy transfer mechanism from Ce 3+ to Tb 3+ ions in the Sr 2 SiO 4 (SSO) hostis electric multipolar interaction. Sr 2 SiO 4 (SSO):Tb 3+ , Ce 3+ phosphor exhibits good thermal stability, the quantum yield wasabout 43.67%, indicating a potential candidate for solid-state lighting.