A systematic and comprehensive comparison of the five commonly used earth radii in geodesy and cartography is carried out,and the differences between the most common points of the earth radii,their corresponding maxim...A systematic and comprehensive comparison of the five commonly used earth radii in geodesy and cartography is carried out,and the differences between the most common points of the earth radii,their corresponding maximum values,and the latitudes of equal points between them are derived with the help of computer algebraic systems.The symbolic expressions are expressed as a power series of the first eccentricity.Taking the CGCS2000 ellipsoid as an example,the differences between the commonly used earth radii are clarified to numerical values.The results show that the difference between the commonly used earth radii has a maximum at 90 degrees and a minimum at 0 degree.The difference between the average radius of curvature and the rectifying sphere radius is the biggest,and the difference between the average radius of curvature and the average sphere radius is the smallest.These results can provide a theoretical basis for corresponding research in the geosciences,space science,navigation and positioning.展开更多
microRNA(miRNA)is a type of small non-coding RNA that can participate in cell proliferation and apoptosis by regulating gene expression.More and more evidences indicate that miRNA-200a is involved in the occurrence an...microRNA(miRNA)is a type of small non-coding RNA that can participate in cell proliferation and apoptosis by regulating gene expression.More and more evidences indicate that miRNA-200a is involved in the occurrence and development of non-alcoholic fatty liver disease,alcoholic liver disease,drug-induced liver injury,liver fibrosis,and hepatocellular carcinoma.Downstream target genes of serotonin,regulating related signal pathways and playing different roles in the progression of a variety of liver diseases,provide a reference for exploring the mechanism of a variety of chronic liver diseases.展开更多
Think Pad X200是联想所发布的第一款采用12．1英寸宽屏设计的产品．重量仅为132Kg．2厘米的厚度无疑会让人感觉飘飘然。X200仍旧延续了Think Pad一贯的稳重风格，机身左侧配备了电源适配器接口．2个USB接口．RJ45接口．无线网卡开关以...Think Pad X200是联想所发布的第一款采用12．1英寸宽屏设计的产品．重量仅为132Kg．2厘米的厚度无疑会让人感觉飘飘然。X200仍旧延续了Think Pad一贯的稳重风格，机身左侧配备了电源适配器接口．2个USB接口．RJ45接口．无线网卡开关以及Express Card接口，右侧配置有音频输出／输入接口，USB接口和安全锁孔。展开更多
基金National Natural Science Foundation of China(Nos.41771487,41971416,41871376)Natural Science Foundation for Distinguished Young Scholars of Hubei Province of China(No.2019CFA086)。
文摘A systematic and comprehensive comparison of the five commonly used earth radii in geodesy and cartography is carried out,and the differences between the most common points of the earth radii,their corresponding maximum values,and the latitudes of equal points between them are derived with the help of computer algebraic systems.The symbolic expressions are expressed as a power series of the first eccentricity.Taking the CGCS2000 ellipsoid as an example,the differences between the commonly used earth radii are clarified to numerical values.The results show that the difference between the commonly used earth radii has a maximum at 90 degrees and a minimum at 0 degree.The difference between the average radius of curvature and the rectifying sphere radius is the biggest,and the difference between the average radius of curvature and the average sphere radius is the smallest.These results can provide a theoretical basis for corresponding research in the geosciences,space science,navigation and positioning.
基金National Natural Science Foundation of China(No.81860790)Guangxi Science and Technology Project(No.Guike AB20297002)+3 种基金Guangxi Natural Science Foundation(No.2020GXNSFAA297160)Guangxi Natural Science Foundation(No.2018GXNSFBA050050)Guangxi First-class Discipline Integrated Traditional Chinese and Western Medicine Cultivation Discipline(No.2019XK159)Guangxi Special Expert Special Project Funding(No.Gui Ren Cai Tong Zi(2019)13)。
文摘microRNA(miRNA)is a type of small non-coding RNA that can participate in cell proliferation and apoptosis by regulating gene expression.More and more evidences indicate that miRNA-200a is involved in the occurrence and development of non-alcoholic fatty liver disease,alcoholic liver disease,drug-induced liver injury,liver fibrosis,and hepatocellular carcinoma.Downstream target genes of serotonin,regulating related signal pathways and playing different roles in the progression of a variety of liver diseases,provide a reference for exploring the mechanism of a variety of chronic liver diseases.
文摘Think Pad X200是联想所发布的第一款采用12．1英寸宽屏设计的产品．重量仅为132Kg．2厘米的厚度无疑会让人感觉飘飘然。X200仍旧延续了Think Pad一贯的稳重风格，机身左侧配备了电源适配器接口．2个USB接口．RJ45接口．无线网卡开关以及Express Card接口，右侧配置有音频输出／输入接口，USB接口和安全锁孔。
