AIDS is a public health problem of which,in spite of the authorized actions and efforts,the socio‐economic,cultural,and political effects on humanity do not cease growing.Finding either preventive or curative solutio...AIDS is a public health problem of which,in spite of the authorized actions and efforts,the socio‐economic,cultural,and political effects on humanity do not cease growing.Finding either preventive or curative solutions remains a big concern and the production of knowledge is still one of the alternatives.It is in this context that this study on the socio‐demographic characteristics in connection with the evolution of the disease in rural environment was carried out.The concerned targets were the rural populations of Indenie‐Djuablin,an area located at the East of the Ivory Coast.Thus,Affalikro,Aniassue,Amelekia,and Bettie,principal large villages of the chief town of Abengourou area were the sites of data collection of nearly 305 samples of individuals using a questionnaire and interview guides.The study used a quantitative and qualitative method with the dialectical and hypothetico‐deductive approaches for the data analysis.The results obtained and discussed made it possible to conclude that the socio‐demographic characteristics,while determining the attitudes and behaviors,expose the individuals to the HIV/AIDS contamination.展开更多
Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its p...Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its polarity and chirality,which traditionally relies on magnetic fields,currents,and spin waves.However,the vortex core’s intrinsic precession under these stimuli hampers fast switching of the polarity and chirality.Here,we demonstrate a fast and precise control of polarity and chirality in magnetic vortices using combined femtosecond(fs)laser and tiny magnetic fields via micromagnetic simulations on Permalloy nanodisks.The fs laser pulse induces an ultrafast quench effect to establish the initial paramagnetic state,while the simultaneously applied magnetic fields precisely target the final vortex structure.Intriguingly,a 110 mT out-ofplane field and a 7 mT in-plane circular field are sufficient to realize precise control of the polarity and chirality on sub-nanosecond time scale,respectively,which are much lower than that of the previous work.Our approach guarantees fast and reliable switching of magnetic vortex polarity and chirality,paving the groundwork for a high-speed quaternary data storage and contributing a novel perspective to the fundamentals of spintronics.展开更多
文摘AIDS is a public health problem of which,in spite of the authorized actions and efforts,the socio‐economic,cultural,and political effects on humanity do not cease growing.Finding either preventive or curative solutions remains a big concern and the production of knowledge is still one of the alternatives.It is in this context that this study on the socio‐demographic characteristics in connection with the evolution of the disease in rural environment was carried out.The concerned targets were the rural populations of Indenie‐Djuablin,an area located at the East of the Ivory Coast.Thus,Affalikro,Aniassue,Amelekia,and Bettie,principal large villages of the chief town of Abengourou area were the sites of data collection of nearly 305 samples of individuals using a questionnaire and interview guides.The study used a quantitative and qualitative method with the dialectical and hypothetico‐deductive approaches for the data analysis.The results obtained and discussed made it possible to conclude that the socio‐demographic characteristics,while determining the attitudes and behaviors,expose the individuals to the HIV/AIDS contamination.
基金supported by the National Key Research and Development Program of China(Grant No.2020YFA0309300)the National Natural Science Foundation of China(NSFC)(Grant Nos.12127803 and 12304146)+5 种基金China Postdoctoral Science Foundation(No.2023M741828)Science and Technology Projects in Guangzhou(Grant No.202201000008)Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2021B1515120047 and 2023B1515020112)the Natural Science Foundation of Tianjin(Grant No.20JCJQJC00210)the 111 Project(Grant No.B23045)the“Fundamental Research Funds for the Central Universities”,Nankai University(Grant Nos.63213040,C029211101,C02922101,ZB22000104,DK2300010207,63243194,and 9242000728).
文摘Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its polarity and chirality,which traditionally relies on magnetic fields,currents,and spin waves.However,the vortex core’s intrinsic precession under these stimuli hampers fast switching of the polarity and chirality.Here,we demonstrate a fast and precise control of polarity and chirality in magnetic vortices using combined femtosecond(fs)laser and tiny magnetic fields via micromagnetic simulations on Permalloy nanodisks.The fs laser pulse induces an ultrafast quench effect to establish the initial paramagnetic state,while the simultaneously applied magnetic fields precisely target the final vortex structure.Intriguingly,a 110 mT out-ofplane field and a 7 mT in-plane circular field are sufficient to realize precise control of the polarity and chirality on sub-nanosecond time scale,respectively,which are much lower than that of the previous work.Our approach guarantees fast and reliable switching of magnetic vortex polarity and chirality,paving the groundwork for a high-speed quaternary data storage and contributing a novel perspective to the fundamentals of spintronics.
