The paper introduces a new approach to estimating the T-year return-period wave height (TRPW), i.e. the wave height expected to occur in T-year, from two sets of observed extreme data and on the basis of the maximum e...The paper introduces a new approach to estimating the T-year return-period wave height (TRPW), i.e. the wave height expected to occur in T-year, from two sets of observed extreme data and on the basis of the maximum entropy principle. The main points of the approach are as follows. 1) A maximum entropy probability density function (PDF) for the extreme wave height H is derived from a Euler equation subject to some necessary and rational constraints. 2) The parameters in the function are expressed in terms of the mth moment of H. 3) This PDF is convenient to theoretical and practical applications as it is simple and its four parameters are easy to be determined from observed extreme data. An example is given for estimating the TRPW in 50 and 100 years by the present approach and by some currently used methods using observed data at two hydrographic stations.The comparison of the estimated results shows that the present approach is quite similar to the Pearson-Ⅲ and Gumbel methods.展开更多
目的:探讨不同年龄段低级别子宫内膜间质肉瘤(LG-ESS)在临床表现、肿瘤情况、临床分期、预后等方面的差异。方法:回顾性分析2010年9月至2015年3月四川大学华西第二医院妇科收治的61例LG-ESS患者的临床病理资料和随访资料。对比不同年龄...目的:探讨不同年龄段低级别子宫内膜间质肉瘤(LG-ESS)在临床表现、肿瘤情况、临床分期、预后等方面的差异。方法:回顾性分析2010年9月至2015年3月四川大学华西第二医院妇科收治的61例LG-ESS患者的临床病理资料和随访资料。对比不同年龄组[≤40岁(29例)和>40岁(32例)],以及年轻患者(≤40岁)中有症状组(15例)和无症状组(14例)间在临床表现及预后等方面的差异。结果:①61例患者平均年龄39.61±9.47岁(17～60岁),其中国际妇产科联盟(FIGO)Ⅰ期47例(77.05%),无明显临床症状患者19例(31.15%)。②≤40岁组与>40岁组比较,单发肿瘤比例(89.65%vs 59.37%)、单发肿瘤最大直径(6.84±2.20 cm vs 6.34±3.83 cm)、无临床症状的比例(48.28%vs 15.63%)差异均有统计学意义(P<0.05)。③不同年龄组FIGO分期比较,差异无统计学意义(P>0.05)。术后中位随访时间为42.8个月(18～60个月),共3例FIGOⅡ期以上患者死亡。不同年龄组患者预后差异无统计学意义(P>0.05)。④≤40岁组患者中,有无症状组间的临床表现和预后相关指标间比较,差异均无统计学意义(P>0.05)。结论:LG-ESS发病年龄相对年轻,肿瘤常单发,直径较大,无特异性临床表现,发病时以早期病例多见,预后较好。临床上对40岁以下年轻无症状的子宫占位的患者应警惕LG-ESS的发生。展开更多
基金the Natural Science Foundation of China under Contract No.40706012the Young Scientist Foundation of State Oceanic Administration under Contract No.2008209+1 种基金the Basic Science Operational Fund of the Ministry of Finance assigned to the Third Institute of Oceanography,State Oceanic Administration under Contract No.2007010‘863’program No.2006AA09A301
文摘The paper introduces a new approach to estimating the T-year return-period wave height (TRPW), i.e. the wave height expected to occur in T-year, from two sets of observed extreme data and on the basis of the maximum entropy principle. The main points of the approach are as follows. 1) A maximum entropy probability density function (PDF) for the extreme wave height H is derived from a Euler equation subject to some necessary and rational constraints. 2) The parameters in the function are expressed in terms of the mth moment of H. 3) This PDF is convenient to theoretical and practical applications as it is simple and its four parameters are easy to be determined from observed extreme data. An example is given for estimating the TRPW in 50 and 100 years by the present approach and by some currently used methods using observed data at two hydrographic stations.The comparison of the estimated results shows that the present approach is quite similar to the Pearson-Ⅲ and Gumbel methods.
文摘目的:探讨不同年龄段低级别子宫内膜间质肉瘤(LG-ESS)在临床表现、肿瘤情况、临床分期、预后等方面的差异。方法:回顾性分析2010年9月至2015年3月四川大学华西第二医院妇科收治的61例LG-ESS患者的临床病理资料和随访资料。对比不同年龄组[≤40岁(29例)和>40岁(32例)],以及年轻患者(≤40岁)中有症状组(15例)和无症状组(14例)间在临床表现及预后等方面的差异。结果:①61例患者平均年龄39.61±9.47岁(17～60岁),其中国际妇产科联盟(FIGO)Ⅰ期47例(77.05%),无明显临床症状患者19例(31.15%)。②≤40岁组与>40岁组比较,单发肿瘤比例(89.65%vs 59.37%)、单发肿瘤最大直径(6.84±2.20 cm vs 6.34±3.83 cm)、无临床症状的比例(48.28%vs 15.63%)差异均有统计学意义(P<0.05)。③不同年龄组FIGO分期比较,差异无统计学意义(P>0.05)。术后中位随访时间为42.8个月(18～60个月),共3例FIGOⅡ期以上患者死亡。不同年龄组患者预后差异无统计学意义(P>0.05)。④≤40岁组患者中,有无症状组间的临床表现和预后相关指标间比较,差异均无统计学意义(P>0.05)。结论:LG-ESS发病年龄相对年轻,肿瘤常单发,直径较大,无特异性临床表现,发病时以早期病例多见,预后较好。临床上对40岁以下年轻无症状的子宫占位的患者应警惕LG-ESS的发生。
