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高温质子交换膜燃料电池电堆稳定性分析与优化 被引量:3
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作者 姬峰 郑博文 +4 位作者 罗若尹 杜玮 邓呈维 杨声 刘志强 《化工进展》 EI CAS CSCD 北大核心 2022年第10期5325-5331,共7页
高温质子交换膜燃料电池(HT-PEMFC)应用前景广阔,但是目前HT-PEMFC电堆寿命较短。为此,本文对一个百瓦级空冷HT-PEMFC电堆的稳定性进行了研究。恒电流测试结果发现电堆中间位置单电池电压的衰减速率是两端的5~10倍。XRD、TEM测试结果表... 高温质子交换膜燃料电池(HT-PEMFC)应用前景广阔,但是目前HT-PEMFC电堆寿命较短。为此,本文对一个百瓦级空冷HT-PEMFC电堆的稳定性进行了研究。恒电流测试结果发现电堆中间位置单电池电压的衰减速率是两端的5~10倍。XRD、TEM测试结果表明电堆不同位置单电池催化剂Pt粒径变化较小,而极板吸酸量滴定与欧姆极化损失分析结果表明中间位置单电池磷酸流失速率是两端的2~3倍,导致其内阻是两端的5~8倍,膜中磷酸的流失迁移至电极导致氧增益电压比两端增加41~102mV。综上,电堆中间位置单电池磷酸流失过快是导致电堆寿命缩短的主要原因,而电堆温度分布不均则是磷酸流失过快的主要原因。因此,若要提高电堆的寿命,关键要从电堆磷酸与热的管理方面进行优化。 展开更多
关键词 高温质子交换膜燃料电池 衰减 耐久性测试 酸流失
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Study on Leaching Loss of Nitrogen in Ricefields by Using Large Undisturbed Monolith Lysimeters 被引量:17
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作者 WANGJIA-YU WANGSHENG-JIA 《Pedosphere》 SCIE CAS CSCD 1994年第1期87-92,共6页
StudyonLeachingLossofNitrogeninRicefieldsbyUs-ingLargeUndisturbedMonolithLysimetersWANGJIA-YU,WANGSHENG-JIAa... StudyonLeachingLossofNitrogeninRicefieldsbyUs-ingLargeUndisturbedMonolithLysimetersWANGJIA-YU,WANGSHENG-JIAandCHENYI(Institut... 展开更多
关键词 LEACHING lysimeter. nitrate NITROGEN ricefields
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Effect of the transcutaneous electrical stimulation system on esophageal-acid exposure in patients non-responsive to once-daily proton-pump inhibitor:proof-of-concept study
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作者 Ram Dickman Sigal Levy +8 位作者 Tsachi Tsadok Perets Maor Hazani-Pauker Doron Boltin Hemda Schmilovitz-Weiss Issa Nidal Matan Siterman Dan Carter Ronnie Fass Rachel Gingold-Belfer 《Gastroenterology Report》 SCIE EI 2021年第4期323-328,I0002,共7页
Background:Gastroesophageal reflux disease(GERD)is a common disorder.Overall,≤35%of GERD patients fail the standard dose of proton-pump-inhibitor(PPI)treatment.Due to the high prevalence and low satisfaction rate wit... Background:Gastroesophageal reflux disease(GERD)is a common disorder.Overall,≤35%of GERD patients fail the standard dose of proton-pump-inhibitor(PPI)treatment.Due to the high prevalence and low satisfaction rate with treatment failure,there is an unmet need for new treatment.Our aim was to evaluate whether the use of the transcutaneous electrical stimulation system(TESS)can reduce esophageal-acid exposure in GERD patients unresponsive to standard-dose PPI.Methods:We enrolled 10 patients suffering from heartburn and regurgitation with an abnormal esophageal-acid exposure(off PPIs)who failed standard-dose PPI.After the placement of a wireless esophageal pH capsule,all patients were treated with TESS.The primary end point was the reduction in the baseline(pretreatment)24-hour percent total time pH<4 and/or DeMeester score by 50%.Results:Seven GERD patients(five females and two males,aged 49.3610.1 years)completed the study.At baseline,the mean percent total time pH<4 was 12.064.9.Following TESS,the mean percent total time pH<4 dropped to 5.563.4,4.562.6,3.762.9,and 4.462.5 on Days 1,2,3,and 4,respectively.At baseline,the mean DeMeester score was 39.0618.5.After TESS,the mean DeMeester score dropped to 15.869.2,13.266.8,11.269.4,and 12.066.8 on Days 1,2,3,and 4,respectively.Conclusion:TESS is a safe and potentially effective modality in reducing esophageal-acid exposure in GERD patients unresponsive to standard-dose PPI.A larger and prospective controlled study is needed to verify these preliminary results. 展开更多
关键词 gastroesophageal reflux disease transcutaneous electrical stimulation system proton-pump inhibitor
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