为降低汽车运输船(Pure Car Truck Carrier,PCTC)的噪声,减小其电力消耗,对风机房和风道的主要组成部分、独立风机房和结构风机房的不同的特点进行分析,并对货舱内部流场、通风阻力、噪声控制等3方面的关键技术进行研究。结果表明:货舱...为降低汽车运输船(Pure Car Truck Carrier,PCTC)的噪声,减小其电力消耗,对风机房和风道的主要组成部分、独立风机房和结构风机房的不同的特点进行分析,并对货舱内部流场、通风阻力、噪声控制等3方面的关键技术进行研究。结果表明:货舱内部流场主要取决于通风总体方案;控制风道通风阻力是设计的关键,对风机房选型和控制噪声有很大影响;计算流体力学(Computational Fluid Dynamics,CFD)分析可有效提高设计的准确性。研究成果可为PCTC货舱通风设计提供一定参考。展开更多
目的分析对比免插管麻醉胸腔镜肺叶切除术(Non-intubated video-assisted thoracoscopic surgery lobectomy,NITLs)与插管麻醉手术(Intubated general anaesthesia,GA)在治疗早期非小细胞肺癌(NSCLC)的安全性、可行性和肿瘤预后。方法按...目的分析对比免插管麻醉胸腔镜肺叶切除术(Non-intubated video-assisted thoracoscopic surgery lobectomy,NITLs)与插管麻醉手术(Intubated general anaesthesia,GA)在治疗早期非小细胞肺癌(NSCLC)的安全性、可行性和肿瘤预后。方法按照Cochrane系统评价制作方法,在Ovid EMBASE、PubMed MEDLINE、Cochrane CENTRAL数据库及Google Scholar搜索免插管麻醉与插管麻醉胸腔镜肺叶切除术治疗早期非小细胞肺癌(NSCLC)的对比研究,运用RevMan 5.4软件分析两组间安全性、可行性和肿瘤预后相关数据。结果经过筛选,4篇文献纳入,共264患者,其中NITLs组126人,GA组138人。Meta分析结果显示,胸腔镜下肺叶切除术的免插管组和插管组之间的比较,两组在手术时间[MD:-9.64,95%CI(21.66,-2.38)P=0.24];淋巴结清扫数目[HR:0.93,95%CI(0.69,1.24),P=0.66];术后并发症发生率[HR:0.54,95%CI(0.2,1.02),P=0.48];术后住院时间[MD:-8.7,95%CI(1.46,-0.28),P=0.89]上差异无统计学意义。结论在分期为I-II期的非小细胞肺癌的胸腔镜下肺叶切除手术治疗中,免插管组和插管组在围手术期和术后结果具有可比性。应考虑免插管方法的肿瘤预后。但肺癌患者的长期益处仍需仔细评估。上述结果仍需更多高质量大样本RCT进行验证。展开更多
We report the thickness dependence of critical current density （Jc） in YBa2Cu3O7-x （YBCO） films with BaZrO3 （BZO） and Y2O3 additions grown on single crystal LaAlO3 substrates by metalorganic deposition using tri...We report the thickness dependence of critical current density （Jc） in YBa2Cu3O7-x （YBCO） films with BaZrO3 （BZO） and Y2O3 additions grown on single crystal LaAlO3 substrates by metalorganic deposition using trifluoroacetates （TFA-MOD）. Comparing with pttre YBCO films, the Jc of BZO/Y2O3-doped YBCO films was significantly enhanced. It was also found that with the increase of the thickness of YBCO film from 0.25 μm to 1.5 μm, the Ic of BZO/Y2O3-doped YBCO film increased from 130 A/cm to 250 A/cm and yet Jc of YBCO film decreased from 6.5 MA/cm2 to 2.5 M A/cm2. The thick BZO/Y2O3-doped MOD-YBCO film showed lower Jc, which is mainly attributed to the formation of a-axis grains and pores.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51272250)the National Basic Research Program of China(Grant No.2011CBA00105)+1 种基金the National High Technology Research and Development Program of China(Grant No.2014AA032702)the Beijing Natural Science Foundation,China(Grant No.2152035)
文摘We report the thickness dependence of critical current density （Jc） in YBa2Cu3O7-x （YBCO） films with BaZrO3 （BZO） and Y2O3 additions grown on single crystal LaAlO3 substrates by metalorganic deposition using trifluoroacetates （TFA-MOD）. Comparing with pttre YBCO films, the Jc of BZO/Y2O3-doped YBCO films was significantly enhanced. It was also found that with the increase of the thickness of YBCO film from 0.25 μm to 1.5 μm, the Ic of BZO/Y2O3-doped YBCO film increased from 130 A/cm to 250 A/cm and yet Jc of YBCO film decreased from 6.5 MA/cm2 to 2.5 M A/cm2. The thick BZO/Y2O3-doped MOD-YBCO film showed lower Jc, which is mainly attributed to the formation of a-axis grains and pores.
