The wavelength dependence of laser induced breakdown spectroscopy （LIBS） in the analysis of the carbon contents of coal was studied using 266 nm and 1064 nm laser radiations. Compared with the 1064 nm wavelength las...The wavelength dependence of laser induced breakdown spectroscopy （LIBS） in the analysis of the carbon contents of coal was studied using 266 nm and 1064 nm laser radiations. Compared with the 1064 nm wavelength laser ablation, the 266 nm wavelength laser ablation has less thermal effects, resulting in a better crater morphology on the coal pellets. Besides, the 266 nm wavelength laser ablation also provides better laser-sample coupling and less plasma shielding, resulting in a higher carbon line intensity and better signal reproducibility. The carbon contents in the bituminous coal samples have better linearity with the line intensities of atomic carbon measured by the 266 nm wavelength than those measured by the 1064 nm wavelength. The partial least square （PLS） model was established for the quantitative analysis of the carbon content in coal samples by LIBS. The results show that both of the 266 nm and 1064 nm wavelengths are capable of achieving good performance for the quantitative analysis of carbon content in coal using the PLS method.展开更多
目的评价胃癌D2根治术后同期放化疗与化疗的疗效及毒副反应。方法计算机检索2013年10月之前纳入Cochrane library图书馆、Embase数据库、Pub Med数据库、Web of Science数据库、Wanfang数据库、CNKI数据库中比较胃癌D2根治术后同期放化...目的评价胃癌D2根治术后同期放化疗与化疗的疗效及毒副反应。方法计算机检索2013年10月之前纳入Cochrane library图书馆、Embase数据库、Pub Med数据库、Web of Science数据库、Wanfang数据库、CNKI数据库中比较胃癌D2根治术后同期放化疗与化疗的随机对照（RCT）研究。依据数据同质性或异质性确定数据使用固定效应模型或随机效应模型。使用Rev Man 5.2软件进行数据分析,两组之间的差异用OR值和95%CI描述。结果共纳入5个RCT研究,总计979例患者。通过Meta分析得出：胃癌D2根治术后同期放化疗与化疗相比,放化疗显著提高了5年局部无复发生存率（LRRFS）及3年总生存率（OS）,但不能提高5年无远处复发生存率（DMRFS）及1年、3年、5年无病生存率（DFS）和1年、5年OS;且拥有和化疗同样的1~2级、3~4级恶心呕吐不良反应及1~2级、3~4级白细胞毒性反应。结论今后研究应依据胃癌的分期、种族、淋巴结转移及淋巴结清扫数目来确定胃癌D2根治术术后同期放化疗与化疗。展开更多
基金supported by National Natural Science Foundation of China(No.51276100)National Basic Research Program of China(973 Program)(No.2013CB228501)
文摘The wavelength dependence of laser induced breakdown spectroscopy （LIBS） in the analysis of the carbon contents of coal was studied using 266 nm and 1064 nm laser radiations. Compared with the 1064 nm wavelength laser ablation, the 266 nm wavelength laser ablation has less thermal effects, resulting in a better crater morphology on the coal pellets. Besides, the 266 nm wavelength laser ablation also provides better laser-sample coupling and less plasma shielding, resulting in a higher carbon line intensity and better signal reproducibility. The carbon contents in the bituminous coal samples have better linearity with the line intensities of atomic carbon measured by the 266 nm wavelength than those measured by the 1064 nm wavelength. The partial least square （PLS） model was established for the quantitative analysis of the carbon content in coal samples by LIBS. The results show that both of the 266 nm and 1064 nm wavelengths are capable of achieving good performance for the quantitative analysis of carbon content in coal using the PLS method.
文摘目的评价胃癌D2根治术后同期放化疗与化疗的疗效及毒副反应。方法计算机检索2013年10月之前纳入Cochrane library图书馆、Embase数据库、Pub Med数据库、Web of Science数据库、Wanfang数据库、CNKI数据库中比较胃癌D2根治术后同期放化疗与化疗的随机对照（RCT）研究。依据数据同质性或异质性确定数据使用固定效应模型或随机效应模型。使用Rev Man 5.2软件进行数据分析,两组之间的差异用OR值和95%CI描述。结果共纳入5个RCT研究,总计979例患者。通过Meta分析得出：胃癌D2根治术后同期放化疗与化疗相比,放化疗显著提高了5年局部无复发生存率（LRRFS）及3年总生存率（OS）,但不能提高5年无远处复发生存率（DMRFS）及1年、3年、5年无病生存率（DFS）和1年、5年OS;且拥有和化疗同样的1~2级、3~4级恶心呕吐不良反应及1~2级、3~4级白细胞毒性反应。结论今后研究应依据胃癌的分期、种族、淋巴结转移及淋巴结清扫数目来确定胃癌D2根治术术后同期放化疗与化疗。
