The anarchic urbanization of certain African cities favors the multiplication of the malaria parasite. Thus, the urgent mobilization of African cities is essential to combat this health risk. It is, therefore, with th...The anarchic urbanization of certain African cities favors the multiplication of the malaria parasite. Thus, the urgent mobilization of African cities is essential to combat this health risk. It is, therefore, with the objective of contributing to the investigation of problem areas that the present study evaluates malaria transmission and vector control strategies in the Cotonou V health zone in particular. This is a cross-sectional study taking into account four neighborhoods, including Wologuèdè, Sainte Rita, Gbèdjromèdé and the area around Etoile Rouge. Two nocturnal captures on voluntary humans and the method of spray were carried out in the dry season from December 2021 to February 2022. On the captured Anopheles, the ELISA Circum-Sporozoite Protein test was performed to determine the infectivity and calculate some transmission parameters. Finally, we conducted a survey using the second stage sampling method with one step to ask selected households about their knowledge of vector control methods, their use and the physical integrity of LLINs. We collected 2386 culicidae of which the majority was Culex quinquefasciatus. After the ELISA test, the 29 Anopheles tested, showed no infectivity, i.e. an EIR of 0 pi/h/n. In addition, 99% of the populations in the Cotonou V area use LLINs to protect themselves. However, coils, door and window screens, aerosol sprays, skin and household repellents, and periodic indoor spraying were used. Finally, the majority of nets observed had T1 tears, but there were also T2, T3 and T4 nets (P-value = 0.0). This study confirms that malaria transmission during the dry season in the Cotonou V health zone is almost negligible but not non-existent. Also, populations are exposed to the nuisance of Culex quinquefasciatus mosquitoes continuously throughout the year.展开更多
新能源汽车主要以锂离子电池作为储能单元,随着锂离子电池的老化,在充电过程中极易发生燃烧甚至爆炸,给电网和充电场站带来巨大安全隐患。电池健康状态(State of Health,SOH)是评价电池老化和性能衰减的重要指标。通过研究锂离子电池的...新能源汽车主要以锂离子电池作为储能单元,随着锂离子电池的老化,在充电过程中极易发生燃烧甚至爆炸,给电网和充电场站带来巨大安全隐患。电池健康状态(State of Health,SOH)是评价电池老化和性能衰减的重要指标。通过研究锂离子电池的充电特性,从中提取反映电池老化的特征向量,采用支持向量机(Support Vector Machine,SVM)估计电池的健康状态,并采用模拟退火算法优化SVM的超参数。研究表明,采用优化后的SVM预测SOH,决定系数为99.73%,预测误差小于0.05%,达到了较高的预测精度。研究成果可以为充电场站的安全运维提供锂离子电池的监测参数,提高充电过程的安全性能。展开更多
文摘The anarchic urbanization of certain African cities favors the multiplication of the malaria parasite. Thus, the urgent mobilization of African cities is essential to combat this health risk. It is, therefore, with the objective of contributing to the investigation of problem areas that the present study evaluates malaria transmission and vector control strategies in the Cotonou V health zone in particular. This is a cross-sectional study taking into account four neighborhoods, including Wologuèdè, Sainte Rita, Gbèdjromèdé and the area around Etoile Rouge. Two nocturnal captures on voluntary humans and the method of spray were carried out in the dry season from December 2021 to February 2022. On the captured Anopheles, the ELISA Circum-Sporozoite Protein test was performed to determine the infectivity and calculate some transmission parameters. Finally, we conducted a survey using the second stage sampling method with one step to ask selected households about their knowledge of vector control methods, their use and the physical integrity of LLINs. We collected 2386 culicidae of which the majority was Culex quinquefasciatus. After the ELISA test, the 29 Anopheles tested, showed no infectivity, i.e. an EIR of 0 pi/h/n. In addition, 99% of the populations in the Cotonou V area use LLINs to protect themselves. However, coils, door and window screens, aerosol sprays, skin and household repellents, and periodic indoor spraying were used. Finally, the majority of nets observed had T1 tears, but there were also T2, T3 and T4 nets (P-value = 0.0). This study confirms that malaria transmission during the dry season in the Cotonou V health zone is almost negligible but not non-existent. Also, populations are exposed to the nuisance of Culex quinquefasciatus mosquitoes continuously throughout the year.
文摘新能源汽车主要以锂离子电池作为储能单元,随着锂离子电池的老化,在充电过程中极易发生燃烧甚至爆炸,给电网和充电场站带来巨大安全隐患。电池健康状态(State of Health,SOH)是评价电池老化和性能衰减的重要指标。通过研究锂离子电池的充电特性,从中提取反映电池老化的特征向量,采用支持向量机(Support Vector Machine,SVM)估计电池的健康状态,并采用模拟退火算法优化SVM的超参数。研究表明,采用优化后的SVM预测SOH,决定系数为99.73%,预测误差小于0.05%,达到了较高的预测精度。研究成果可以为充电场站的安全运维提供锂离子电池的监测参数,提高充电过程的安全性能。
