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Tropical cyclones frequently occur in densely populated coastal areas of China, causing serious casualties. Based on the data of tropical cyclones in the Northwestern Pacific from 1980 to 2020, the present study analyzed the spatiotemporal distribution characteristics of the generation and landfall of tropical cyclones that landed in China. Combined with spatialized population data of China during the same period, sensitivity experiments were conducted to analyze the main influencing factors of the changes in tropical cyclone exposure and their respective contribution rate. The results show that: (1) From 1980 to 2020, a total of 1217 tropical cyclones were generated in the Northwestern Pacific, 270 of which landed in China, and the frequency of cyclones generated and those landed in China showed a decreasing trend; among them, 88 tropical cyclones of typhoon intensity or higher made landfall, showing a slowly increasing trend, and the frequency of strong typhoons increased significantly. (2) Tropical cyclones of typhoon intensity or higher mainly landed in Guangdong, Zhejiang, Hainan, Fujian, and Jiangsu provinces in descending order of landing frequency, while super typhoons concentrated in Guangdong, Zhejiang, Fujian, and Hainan provinces. (3) From 1980 to 2020, the total population exposed to tropical cyclones of typhoon intensity or higher in China was 3.58 billion, and the exposed population in 2016 was 250 million, the highest in history; the cumulative affected area during the same period was 9.5×106 km², and Guangxi had the largest cumulative exposure area, 2.1 × 106 km². (4) The contribution rate of tropical cyclones to population exposure was the highest in all periods, exceeding 60%; it first increased and then decreased over the interdecadal time scale, reaching a peak of 80.3% during 2000-2009; the contribution rate of population and other factors showed synchronous changes (first decrease and then increase with time), and the increase in the contribution of population was greater. [ABSTRACT FROM AUTHOR]

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Agricultural Outlook (1673-3908) is the property of Institute of Agricultural Information, Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of West China Journal of Stomatology is the property of Sichuan University, West China College of Stomatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To analyze the feasibility and tractability of three methods of autologous blood transfusion in cesarean section. Methods: According to the maternal physiological characters, the possible problems and the advantages and disadvantages of three methods of autologous blood transfusion. In the application were analyzed respectively. Results: The preoperative autologous blood donation was flexible in operation time and large in storage volume, but it was relatively cumbersome because of many sections involved; Hemodilution autotransfusion was extremely fitted the maternal physiological characters, which can provide the blood reserve and promote the uptake and utilization of oxygen in human tissue cells, but disposable blood volume was limited; Intraoperative blood salvage did not requiring a direct operation on the puerperants, so the patient was relatively easy to accept, but it was rarely applied in practice because the salvaged blood may be polluted by amniotic fluid and fetal blood. Conclusions: The three methods of autologous blood transfusion have advantages and disadvantages, but hemodilution autotransfusion is more feasible in the application of cesarean section, because of its simple and suitable for maternal physiological characters. A combination of two or three methods of autologous blood transfusion may be considered when the amount of hemorrhage is expected to be large. [ABSTRACT FROM AUTHOR]