[HIV infection status and related factors in men who have sex with men in sentinel surveillance in Shanxi province, 2010, 2015 and 2020].

Objective: To understand the infection status of HIV and related factors in men who have sex with men (MSM) in Shanxi province in 2010, 2015 and 2020. Methods: According to the sentinel surveillance protocol, continuous cross-sectional survey were conducted to collect the information about basic characteristics, general demographic characteristics, AIDS knowledge awareness, high-risk sexual behavior, sexually transmitted diseases, intervention services and HIV infection rate of the MSM in Shanxi in 2010, 2015 and 2020. Results: In 2010, 2015 and 2020, a total of 2 708 MSM were included in this study. There were significant differences in HIV infection rate among three years (χ2=23.76, P<0.001) with an increasing trend with year (trend χ2 =17.34, P<0.001). The rates of anal sex, commercial sex and heterosexual behavior in the past 6 months were 77.62% (2 102/2 708), 5.91% (160/2 708) and 28.14% (762/2 708) respectively, and the rates of consistent use of condom were 52.52% (1 104/2 102), 63.13% (101/160) and 23.49%(179/762) respectively, and the rate of consistent condom use was low. Results from multivariate logistic regression analysis showed that different cities, having educational level of junior high school or below, being recruited through internet, voluntary counseling and testing, suffering from sexually transmitted diseases, occasional condom use in anal sex in the past 6 months were the correlative factors of HIV infection of MSM. Conclusions: The HIV infection rate of MSM in Shanxi increased year by year from 2010, 2015 to 2020. The HIV/AIDS-related risk behavior persisted, and the proportion of condomuse adherence was low, and the HIV detection rate was low in the MSM, so targeted and effective measures should be taken to promote the condom use adherence and regular HIV testing in MSM.

[Studies on the properties of energy upconversion of the rare earth ErYb and HoYb in the oxyfluoride glass].

Er and Yb, Ho and Yb codoped in the oxyfluoride were burnt on in the specific temperature, and got two kinds of samples. Using 930 nm as an exciting light, the emitting fluorescent spectra of two kinds of the samples were measured, and observed the red band and green band fluorescent spectra, respectively. According to the detected absorption spectra of Er2O3, Ho2O3, Yb2O3 and the rule of energy jump, the mechanism and the properties of the energy upconversion of two kinds of the samples were explained. As can be seen, energy upconversion properties were determined mainly by the absorbtion spectra of Er2O3, Yb2O3. Energy upconversion efficiency were determined by excitative photons.

[Photoluminescence from Er-doped silicon-rich silicon oxide film and Er-doped silicon-rich silicon nitride film and its annealing behavior].

Room temperature photoluminescence (PL) with a peak at 1.54 microns was observed from silicon oxide, silicon-rich silicon oxide, silicon nitride and silicon-rich silicon nitride films, all doped with Er and grown by the magnetron sputtering technique. To determine the optimum annealing temperature for the 1.54 microns PL, these films were annealed in the range of 600-1,100 degrees C with an interval of 100 degrees C. Among these four types of films annealed at an identical temperature, the intensity of 1.54 microns PL peak of the Er-doped silicon-rich silicon oxide film was always the strongest one, which arrived at a maximum in 800 degrees C annealing. A 1.38 microns PL band was also observed in each of these four types of films, and which in the silicon-rich silicon oxide or silicon-rich silicon nitride films was found to be correlated with the 1.54 microns PL band in intensity.