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Bang-Bang阀调节的开关型贮供系统压力控制特性
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作者 顾大陆 曾维亮 +1 位作者 雷小飞 靳泓睿 《火箭推进》 CAS 2023年第2期74-82,共9页
针对某射频离子电推进氙气贮供系统长期在轨、高精度减压的技术难点,提出了一种基于双无摩擦电磁阀Bang-Bang控制的开关型贮供系统方案。建立了开关型贮供系统减压模块的气动-控制-电磁-机械动态数学模型,基于AMESim平台搭建了贮供系统... 针对某射频离子电推进氙气贮供系统长期在轨、高精度减压的技术难点,提出了一种基于双无摩擦电磁阀Bang-Bang控制的开关型贮供系统方案。建立了开关型贮供系统减压模块的气动-控制-电磁-机械动态数学模型,基于AMESim平台搭建了贮供系统的工作特性仿真模型,对贮供系统减压模块中缓冲罐输出压力随时间的变化情况进行了仿真研究,分析了入口压力、缓冲罐容积和中间腔容积对压力控制特性的影响。计算结果表明:通过控制器特定的分布开关控制方式,使Bang-Bang阀组件在一个减压周期内只向缓冲罐补充极少量气体,保证了缓冲罐输出压力能够持续稳定在设定的压力上下限范围内,实现了氙气工质从550 kPa到60 kPa的长时间、高精度减压要求;入口压力对减压模块调节性能的影响较大,入口压力越大,贮供系统的压力控制精度越低;贮供系统减压模块的仿真结果与试验结果基本一致,验证了仿真模型和仿真结果的正确性。 展开更多
关键词 开关型贮供系统 减压模块 Bang-Bang阀 压力控制特性 减压周期
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Roux-en-Y reconstruction does not require gastric decompression after radical distal gastrectomy 被引量:11
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作者 Cheng-Jueng Chen Tsang-Pai Liu +6 位作者 Jyh-Cherng Yu Sheng-Der Hsua Tsai-Yuan Hsieh Heng-Cheng Chu Chung-Bao Hsieh Teng-Wei Chen, De-Chuan Chan 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第3期251-256,共6页
AIM: To determine whether routine nasogastric (NG) decompression benefitted patients undergoing radical gastric surgery. METHODS: Between January 1998 and December 2008, 519 patients who underwent distal gastrectomy f... AIM: To determine whether routine nasogastric (NG) decompression benefitted patients undergoing radical gastric surgery. METHODS: Between January 1998 and December 2008, 519 patients who underwent distal gastrectomy for gastric cancer were retrospectively divided into 2 time-period cohorts; those treated with Billroth Ⅱ (BⅡ) reconstruction in the first 6 years and those with Roux-en-Y (RY) reconstruction in the last 5 years. In the latter group, the patients were further divided into 2 subgroups; with and without nasogastric decompression.RESULTS: Postoperatively, there were no significant differences in the number of anastomotic leaks between the 3 groups. In the tubeless RY group, time to semiliquid diet was significantly shorter than in the other 2 groups (4.4 d ± 1.4 d vs 7.2 d ± 1.3 d and 5.9 d ± 1.2 d, P = 0.005). The length of postoperative stay was significantly increased in patients with BⅡ reconstruction compared with patients with RY reconstruction with/without NG decompression (15.4 d ± 4.3 d in BⅡ group vs 12.6 d ± 3.1 d in decompressed RY and 11.4 d ± 3.4 d in the tubeless RY group, P = 0.035). The postoperative pneumonia rate was lowest in the tubeless group and highest in the BⅡ group (1.4% vs 4.6%, P = 0.01). Severe sore throat was noted in 59 (20.7%) members of the BⅡ group, 18 (17.4%) members of the decompressed RY group and 6 (4.2%) members of the tubeless RY group. Fewer patients in the tubeless group complained of severe sore throat (P = 0.001). CONCLUSION: This study provides support for abandoning routine NG decompression in patients undergoing subtotal gastrectomy with Roux-en-Y gastrojejunostomy. 展开更多
关键词 Nasogastric decompression Billroth gas- trojejunostomy Roux-en-Y gastrojejunostomy Radical distal gastrectomy Gastric cancer
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