This paper proposes a design of passive cooling system for CPR1000 spent fuel pool(SFP). Our design can effectively manage the SFP temperature not to exceed80 C. Then the transient analysis of the CPR1000 SFP with des...This paper proposes a design of passive cooling system for CPR1000 spent fuel pool(SFP). Our design can effectively manage the SFP temperature not to exceed80 C. Then the transient analysis of the CPR1000 SFP with designed passive cooling system is carried out in station blackout(SBO) accident by the best-estimate thermal-hydraulic system code RELAP5. The simulation results show that to maintain the temperature of CPR1000 SFP under 80 C, the numbers of the SFP and air cooling heat exchangers tubes are 6627 and 19 086, respectively.The height difference between the bottom of the air cooling heat exchanger and the top of the SFP heat exchanger is3.8 m. The number of SFP heat exchanger tubes decreases as the height difference increases, while the number of the air cooling heat exchanger tubes increases. The transient analysis results show that after the SBO accident, a stable natural cooling circulation is established. The surface temperature of CPR1000 SFP increases continually until 80 C, which indicates that the design of the passive air cooling system for CPR1000 SFP is capable of removing the decay heat to maintain the temperature of the SFP around 80 C after losing the heat sink.展开更多
目的探讨参芪利水颗粒配合脐灸治疗慢性阻塞性肺疾病急性加重期(Acute exacerbation of chronic obstructivepulmonary disease,AECOPD)患者的临床疗效。方法选取2022年8月—2023年8月自河北省保定市第一中医院收治的60例AECOPD患者,按...目的探讨参芪利水颗粒配合脐灸治疗慢性阻塞性肺疾病急性加重期(Acute exacerbation of chronic obstructivepulmonary disease,AECOPD)患者的临床疗效。方法选取2022年8月—2023年8月自河北省保定市第一中医院收治的60例AECOPD患者,按照随机数字表法分为对照组和观察组,每组各30例。对照组采用常规西医治疗方法,观察组在对照组基础上脐灸联合参芪利水颗粒治疗,治疗2周后,观察比较两组患者临床疗效、治疗安全性,治疗前后改良版英国医学研究委员会呼吸问卷(modified British medical research council,mMRC)评分、慢阻肺患者自我评估测试(COPD Assessment test,CAT)评分、血气分析指标及血清炎性因子[降钙素原(Procalcitonin,PCT)、肿瘤坏死因子-α(Tumor necrosis factor alpha-α,TNF-α)、白细胞介素-6(Interleukin-6,IL-6)]水平。结果治疗后观察组临床总有效率93.33%(28/30)明显高于对照组66.67%(20/30),差异有统计学意义(P<0.05)。治疗后两组患者mMRC、CAT评分均较治疗前降低,差异有统计学意义(P<0.05);且观察组mMRC、CAT评分均明显低于对照组,差异有统计学意义(P<0.05)。治疗后两组患者PaCO_(2)指标均较治疗前降低,PaO_(2)和SaO_(2)指标均较治疗前升高,差异有统计学意义(P<0.05);且观察组PaCO_(2)指标较对照组明显降低,PaO_(2)和SaO 2指标均较对照组明显升高,差异有统计学意义(P<0.05)。治疗后两组患者PCT、TNF-α、IL-6水平均较治疗前降低,差异有统计学意义(P<0.05),且观察组PCT、TNF-α、IL-6水平均较对照组明显降低,差异有统计学意义(P<0.05)。治疗期间,两组患者均未见与治疗药物相关的不良反应情况发生。结论参芪利水颗粒配合脐灸能够抑制AECOPD炎症反应,改善患者血气分析指标,缓解临床症状。展开更多
基金supported by National High-tech R&D Program of China(No.2012AA050905)
文摘This paper proposes a design of passive cooling system for CPR1000 spent fuel pool(SFP). Our design can effectively manage the SFP temperature not to exceed80 C. Then the transient analysis of the CPR1000 SFP with designed passive cooling system is carried out in station blackout(SBO) accident by the best-estimate thermal-hydraulic system code RELAP5. The simulation results show that to maintain the temperature of CPR1000 SFP under 80 C, the numbers of the SFP and air cooling heat exchangers tubes are 6627 and 19 086, respectively.The height difference between the bottom of the air cooling heat exchanger and the top of the SFP heat exchanger is3.8 m. The number of SFP heat exchanger tubes decreases as the height difference increases, while the number of the air cooling heat exchanger tubes increases. The transient analysis results show that after the SBO accident, a stable natural cooling circulation is established. The surface temperature of CPR1000 SFP increases continually until 80 C, which indicates that the design of the passive air cooling system for CPR1000 SFP is capable of removing the decay heat to maintain the temperature of the SFP around 80 C after losing the heat sink.
文摘目的探讨参芪利水颗粒配合脐灸治疗慢性阻塞性肺疾病急性加重期(Acute exacerbation of chronic obstructivepulmonary disease,AECOPD)患者的临床疗效。方法选取2022年8月—2023年8月自河北省保定市第一中医院收治的60例AECOPD患者,按照随机数字表法分为对照组和观察组,每组各30例。对照组采用常规西医治疗方法,观察组在对照组基础上脐灸联合参芪利水颗粒治疗,治疗2周后,观察比较两组患者临床疗效、治疗安全性,治疗前后改良版英国医学研究委员会呼吸问卷(modified British medical research council,mMRC)评分、慢阻肺患者自我评估测试(COPD Assessment test,CAT)评分、血气分析指标及血清炎性因子[降钙素原(Procalcitonin,PCT)、肿瘤坏死因子-α(Tumor necrosis factor alpha-α,TNF-α)、白细胞介素-6(Interleukin-6,IL-6)]水平。结果治疗后观察组临床总有效率93.33%(28/30)明显高于对照组66.67%(20/30),差异有统计学意义(P<0.05)。治疗后两组患者mMRC、CAT评分均较治疗前降低,差异有统计学意义(P<0.05);且观察组mMRC、CAT评分均明显低于对照组,差异有统计学意义(P<0.05)。治疗后两组患者PaCO_(2)指标均较治疗前降低,PaO_(2)和SaO_(2)指标均较治疗前升高,差异有统计学意义(P<0.05);且观察组PaCO_(2)指标较对照组明显降低,PaO_(2)和SaO 2指标均较对照组明显升高,差异有统计学意义(P<0.05)。治疗后两组患者PCT、TNF-α、IL-6水平均较治疗前降低,差异有统计学意义(P<0.05),且观察组PCT、TNF-α、IL-6水平均较对照组明显降低,差异有统计学意义(P<0.05)。治疗期间,两组患者均未见与治疗药物相关的不良反应情况发生。结论参芪利水颗粒配合脐灸能够抑制AECOPD炎症反应,改善患者血气分析指标,缓解临床症状。