Objectives: To describe and analyze HIV/AIDS/STD-related high risk behaviors and affecting factors of men who have sex with men (MSM) in China's Mainland~ Methods: 426 self-administered or interview-based question...Objectives: To describe and analyze HIV/AIDS/STD-related high risk behaviors and affecting factors of men who have sex with men (MSM) in China's Mainland~ Methods: 426 self-administered or interview-based questionnaires collected from MSM were analyzed with SPSS or SAS Systems. Results: Of the MSM, four-fifths had engaged in oral-genital intercourse, about half had engaged in anal intercourse, and in the past year more than two-fifths had casual sexual partner(s).Very few maintained monogamous sexual relationships, and nearly half also had intercourse with women. One fourth had previously been diagnosed with a venereal diseases. One HIV+individual was found among the 40 who reported having been tested for HIV. Only two men consistently used condoms among the one-third who had ever used condoms, despite almost universal knowledge of HIV and its transmission. Conclusions: MSM in China's Mainland are very sexually active, highlighting the possibility of a serious HIV epidemic that may be directly spread to the female population. However,AIDS interventions targeting MSM face severe obstructions resulting from cultural bias and other factors.展开更多
We investigate a tagged particle in the exclusion processes on {1,..., N }×Zd, with different densities in different levels {k} × Zd, ? k. Ignoring the level the tagged particle lying in, we only concern its...We investigate a tagged particle in the exclusion processes on {1,..., N }×Zd, with different densities in different levels {k} × Zd, ? k. Ignoring the level the tagged particle lying in, we only concern its position in Zd,denoted by Xt. Note that the whole space is not homogeneous. We define the environment process viewed from the tagged particle, of which Xt can be expressed as a functional. It is called the tagged particle process. We show the ergodicity of the tagged particle process, then prove the strong law of large numbers. Furthermore, we show the central limit theorem of Xt provided the zero-mean condition.展开更多
文摘Objectives: To describe and analyze HIV/AIDS/STD-related high risk behaviors and affecting factors of men who have sex with men (MSM) in China's Mainland~ Methods: 426 self-administered or interview-based questionnaires collected from MSM were analyzed with SPSS or SAS Systems. Results: Of the MSM, four-fifths had engaged in oral-genital intercourse, about half had engaged in anal intercourse, and in the past year more than two-fifths had casual sexual partner(s).Very few maintained monogamous sexual relationships, and nearly half also had intercourse with women. One fourth had previously been diagnosed with a venereal diseases. One HIV+individual was found among the 40 who reported having been tested for HIV. Only two men consistently used condoms among the one-third who had ever used condoms, despite almost universal knowledge of HIV and its transmission. Conclusions: MSM in China's Mainland are very sexually active, highlighting the possibility of a serious HIV epidemic that may be directly spread to the female population. However,AIDS interventions targeting MSM face severe obstructions resulting from cultural bias and other factors.
基金supported by National Natural Science Foundation of China(Grant No.11371040)
文摘We investigate a tagged particle in the exclusion processes on {1,..., N }×Zd, with different densities in different levels {k} × Zd, ? k. Ignoring the level the tagged particle lying in, we only concern its position in Zd,denoted by Xt. Note that the whole space is not homogeneous. We define the environment process viewed from the tagged particle, of which Xt can be expressed as a functional. It is called the tagged particle process. We show the ergodicity of the tagged particle process, then prove the strong law of large numbers. Furthermore, we show the central limit theorem of Xt provided the zero-mean condition.
