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The Relationship between Siberian High Anomaly and SSTA 被引量:1
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作者 侯亚红 李刚 路爽 《Meteorological and Environmental Research》 CAS 2010年第4期65-67,86,共4页
By using the monthly average dataset of NCEP/NCAR reanalysis and the monthly average ocean temperature data of NOAA satellite center,we analyzed and probed into the relationship between Siberian high anomaly and SSTA,... By using the monthly average dataset of NCEP/NCAR reanalysis and the monthly average ocean temperature data of NOAA satellite center,we analyzed and probed into the relationship between Siberian high anomaly and SSTA,and found that the sea area anomaly is a bigger area,which have greater effect on the variation of Siberian high.The results indicated that there was a wonderful contemporaneously correlation between the area and intensity index of Siberian high and ocean temperature.The correlation type of the synchronous correlative areas between the central intensity index of Siberian high and ocean temperature have structural similarities with the correlative field's structure of area index,but the positive correlative regions expanded,and the intensity of negative correlative regions weakened significantly.The correlation among the area index of Siberian high and the central intensity index,as well as the ocean temperature anomaly of the North Atlantic during spring,autumn and summer of the same year was remarkable.The area index and the central intensity index of Siberian high anomaly have obvious correlation with the ocean temperature anomaly of Southwest Atlantic Ocean during spring,summer and autumn,however,they have apparent seasonal differences with the prominent negative correlative areas of subtropical South Indian Ocean and tropical South Pacific Ocean as well as Southwest Atlantic Ocean.The correlative index of area anomaly is greater than those of intensity anomaly.Larger impact on the variability of Siberian high anomaly are the SSTA of subtropical South Indian Ocean,mid and high latitudes of North Pacific Ocean,North Atlantic,tropical South Pacific Ocean,Southwest Atlantic Ocean,etc.several areas. 展开更多
关键词 Siberian high Anomalous variation Area index central intensity index SSTA China
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MRI信号强度比在脑恶性肿瘤鉴别诊断及Ki-67表达的应用价值
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作者 于红梅 陈敏 +3 位作者 余婷 黄怡 耿学龙 蒋锐 《影像诊断与介入放射学》 2023年第2期89-95,共7页
目的探讨常规MRI信号强度比(SIR)在鉴别诊断胶质母细胞瘤(GBM)与原发性中枢神经系统淋巴瘤(PCNSL)的应用价值及与Ki-67表达的相关性。方法回顾性分析本院72例GBM和32例PCNSL MRI资料,应用t检验分析肿瘤SIR,包括T1WI信号比(rT1)、T2WI信... 目的探讨常规MRI信号强度比(SIR)在鉴别诊断胶质母细胞瘤(GBM)与原发性中枢神经系统淋巴瘤(PCNSL)的应用价值及与Ki-67表达的相关性。方法回顾性分析本院72例GBM和32例PCNSL MRI资料,应用t检验分析肿瘤SIR,包括T1WI信号比(rT1)、T2WI信号强度比(rT2)、T1WI增强信号比(rT1CE)及T2WI/T1WI信号比(T2/T1)四个指标,并通过受试者工作特征(ROC)曲线评估单个及联合指标的鉴别诊断性能,Spearman检验分析SIR与Ki-67标记指数(Ki-67 LI)的相关性。结果GBM rT1和rT1CE(rT1:0.482±0.117,rT1CE:1.319±0.243)明显低于PCNSL(rT1:0.557±0.478,rT1CE:1.594±0.156),而rT2及T2/T1(rT2:1.814±0.285,T2/T1:3.995±1.189)明显高于PCNSL(rT2:1.435±0.135,T2/T1:2.600±0.354),两组之间比较差异均具有统计学意义(P<0.001);ROC曲线分析rT1、rT2、rT1CE和T2/T1可用于鉴别GBM与PCNSL,其中单个参数时,T2/T1诊断效能最好(AUC:0.877),其敏感度93.8%,特异度76.4%,多个参数联合后,rT1+rT1CE+rT2+T2/T1鉴别诊断效能最高(AUC:0.966),敏感度和特异度分别为87.5%、91.7%。相关分析显示rT1和rT1CE与Ki-67 LI呈正相关,相关系数分别为0.301、0.399,rT2、T2/T1与Ki-67 LI呈负相关,相关系数分别为-0.428、-0.459。结论MRI肿瘤信号强度比对于GBM与PCNSL的鉴别诊断具有重要意义,其信号强度比作为定量参数,可为主观判断提供重要补充,并可初步评估肿瘤细胞增殖水平。 展开更多
关键词 胶质母细胞瘤 原发性中枢神经系统淋巴瘤 磁共振成像 信号强度比 KI-67标记指数
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“一带一路”背景下中国与中亚五国农产品贸易潜在优势研究
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作者 段凯 《湖北农业科学》 2023年第2期42-46,共5页
运用贸易结合度指数(TII)分析方法,基于2010—2019年中国与中亚五国贸易进出口数据,对中国与中亚各国农产品贸易潜在优势进行分析。结果表明,中国与中亚各国贸易潜在优势由强到弱依次为中吉、中哈、中乌、中塔和中土。中吉、中哈、中乌... 运用贸易结合度指数(TII)分析方法,基于2010—2019年中国与中亚五国贸易进出口数据,对中国与中亚各国农产品贸易潜在优势进行分析。结果表明,中国与中亚各国贸易潜在优势由强到弱依次为中吉、中哈、中乌、中塔和中土。中吉、中哈、中乌和中塔贸易联系较为紧密,贸易潜在优势大,中土贸易联系最松散,贸易潜在优势较小;与其他中亚四国相比,中吉在动物产品、植物产品和农产品制成品方面均表现出较大的贸易潜在优势;中哈在植物产品和农产品制成品方面具有较大的贸易潜在优势;中吉在四大类农产品贸易中均表现出较大的贸易潜在优势;中塔在植物产品、动物油脂产品和动物产品方面表现出较大的贸易潜在优势;中土在植物产品方面表现出较大的贸易潜在优势;中乌在植物产品和动物油脂产品方面表现出较大的贸易潜在优势。 展开更多
关键词 “一带一路” 中国与中亚五国 农产品贸易 潜在优势 贸易结合度指数
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