In this paper, a newly established "South China Regional Short Range Climate Prediction Model System" is introduced and its performance is analyzed in real case simulation. It shows that the system has a goo...In this paper, a newly established "South China Regional Short Range Climate Prediction Model System" is introduced and its performance is analyzed in real case simulation. It shows that the system has a good performance and suitable for short range climate modeling. The model simulates well the monthly mean, pentad mean and daily field, pentad mean and daily field and can depict more details than coarse resolution analyses. Weather systems and information can pass into and out of the model domain through lateral boundaries without notable damping. Almost all of the weather and climate changes can be reflected in the simulation, in which both the changing tendencies, amplitudes, speeds, and phases are consistent with the real cases. The simulated precipitation is much close to the observed one, both in the extent, position and in the intensity of rainfall. In addition, some smaller precipitation centers could also be reflected in the simulation.展开更多
Using the method of structural equation and balanced scorecard,this paper establishes the evaluation indicators and evaluation model for the performance of 21 rural cooperative economic organizations in X City of Huna...Using the method of structural equation and balanced scorecard,this paper establishes the evaluation indicators and evaluation model for the performance of 21 rural cooperative economic organizations in X City of Hunan Province,and analyzes the relationship between indicators and dimensions of performance evaluation indicators,in order to find the influencing factors,obstacles and successful experience concerning the development of rural cooperative economic organizations. According to model analysis and conclusions,this paper sets forth the recommendations for promoting the development of rural cooperative economic organizations in Hunan Province,in order to provide a scientific basis for the institutional design and mechanism innovation of rural cooperative economic organizations in Hunan Province.展开更多
目的探讨屏气压缩感知磁共振胰胆管成像(breath-hold magnetic resonance cholangiopancreatography with compressed sensing,BH-CS-MRCP)鉴别诊断胆总管良恶性梗阻的价值。材料与方法招募临床确诊的胆总管梗阻患者,所有患者均行BH-CS-...目的探讨屏气压缩感知磁共振胰胆管成像(breath-hold magnetic resonance cholangiopancreatography with compressed sensing,BH-CS-MRCP)鉴别诊断胆总管良恶性梗阻的价值。材料与方法招募临床确诊的胆总管梗阻患者,所有患者均行BH-CS-MRCP、呼吸导航的压缩感知磁共振胰胆管成像(navigator-triggered magnetic resonance cholangiopancreatography with compressed sensing,NT-CS-MRCP)和常规磁共振胰胆管成像(traditional magnetic resonance cholangiopancreatography,T-MRCP)序列扫描,并记录扫描时间。由两位影像诊断医师对三组MRCP的图像质量、胆管及胰管的显示度、梗阻病变的可视度和锐度、梗阻病变的良恶性判断进行评估。采取单因素方差分析比较三种序列图像评价指标的差异,分别计算其敏感度、特异度、准确度。结果68例胆总管梗阻患者,年龄(59.97±15.75)岁,男42例,女26例,良性梗阻49例,恶性梗阻19例。BH-CS-MRCP、NT-CS-MRCP、T-MRCP扫描时间分别为17 s、(210.61±38.52)s、(443.65±78.45)s。BH-CS-MRCP、NT-CS-MRCP、T-MRCP对图像总体质量、胆管(胆总管、一级胆管、二级胆管)、胰管的显示差异无统计学意义(P>0.05)。三种序列对梗阻部位病变的锐度及可视度的评分差异无统计学意义(P>0.05)。胆总管恶性梗阻诊断中,BH-CS-MRCP、NT-CS-MRCP的敏感度均为84.21%、特异度均为91.84%、准确度均为89.71%,T-MRCP的敏感度为84.21%、特异度为89.58%、准确度为86.76%。结论和T-MRCP相比,BH-CS-MRCP和NT-CS-MRCP可以利用较短的时间获得相当质量的图像及较好的胆总管良恶性梗阻的鉴别诊断效能。展开更多
基金A core scientific research project in the national 9th five-year economic development plan (96-908-05-07)
文摘In this paper, a newly established "South China Regional Short Range Climate Prediction Model System" is introduced and its performance is analyzed in real case simulation. It shows that the system has a good performance and suitable for short range climate modeling. The model simulates well the monthly mean, pentad mean and daily field, pentad mean and daily field and can depict more details than coarse resolution analyses. Weather systems and information can pass into and out of the model domain through lateral boundaries without notable damping. Almost all of the weather and climate changes can be reflected in the simulation, in which both the changing tendencies, amplitudes, speeds, and phases are consistent with the real cases. The simulated precipitation is much close to the observed one, both in the extent, position and in the intensity of rainfall. In addition, some smaller precipitation centers could also be reflected in the simulation.
基金Supported by Key Project of National Social Science Foundation(12&ZD0-03)Hunan Philosophy and Social Science Fund Project(13ZDB1112YBA281)
文摘Using the method of structural equation and balanced scorecard,this paper establishes the evaluation indicators and evaluation model for the performance of 21 rural cooperative economic organizations in X City of Hunan Province,and analyzes the relationship between indicators and dimensions of performance evaluation indicators,in order to find the influencing factors,obstacles and successful experience concerning the development of rural cooperative economic organizations. According to model analysis and conclusions,this paper sets forth the recommendations for promoting the development of rural cooperative economic organizations in Hunan Province,in order to provide a scientific basis for the institutional design and mechanism innovation of rural cooperative economic organizations in Hunan Province.
文摘目的探讨屏气压缩感知磁共振胰胆管成像(breath-hold magnetic resonance cholangiopancreatography with compressed sensing,BH-CS-MRCP)鉴别诊断胆总管良恶性梗阻的价值。材料与方法招募临床确诊的胆总管梗阻患者,所有患者均行BH-CS-MRCP、呼吸导航的压缩感知磁共振胰胆管成像(navigator-triggered magnetic resonance cholangiopancreatography with compressed sensing,NT-CS-MRCP)和常规磁共振胰胆管成像(traditional magnetic resonance cholangiopancreatography,T-MRCP)序列扫描,并记录扫描时间。由两位影像诊断医师对三组MRCP的图像质量、胆管及胰管的显示度、梗阻病变的可视度和锐度、梗阻病变的良恶性判断进行评估。采取单因素方差分析比较三种序列图像评价指标的差异,分别计算其敏感度、特异度、准确度。结果68例胆总管梗阻患者,年龄(59.97±15.75)岁,男42例,女26例,良性梗阻49例,恶性梗阻19例。BH-CS-MRCP、NT-CS-MRCP、T-MRCP扫描时间分别为17 s、(210.61±38.52)s、(443.65±78.45)s。BH-CS-MRCP、NT-CS-MRCP、T-MRCP对图像总体质量、胆管(胆总管、一级胆管、二级胆管)、胰管的显示差异无统计学意义(P>0.05)。三种序列对梗阻部位病变的锐度及可视度的评分差异无统计学意义(P>0.05)。胆总管恶性梗阻诊断中,BH-CS-MRCP、NT-CS-MRCP的敏感度均为84.21%、特异度均为91.84%、准确度均为89.71%,T-MRCP的敏感度为84.21%、特异度为89.58%、准确度为86.76%。结论和T-MRCP相比,BH-CS-MRCP和NT-CS-MRCP可以利用较短的时间获得相当质量的图像及较好的胆总管良恶性梗阻的鉴别诊断效能。
