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ObjectiveTo investigate the menstrual conditions of women infected with COVID-19 in Shanghai and analyze the influencing factors.MethodsFrom December 2022 to March 2023， menstrual data from 281 women infected with COVID-19 in Shanghai were collected with a questionnaire survey， including usual menstrual characteristics， the most recent menstrual period post-infection， symptoms of infection， and medication usage. According to the crossover period between the menstrual period and the infection period of the respondents， the samples were divided into two groups for comparative analysis： those whose menstrual and infection periods overlapped （positive group） and those whose menstruation started after conversion to virus-negative （negative conversion group）.ResultsAmong the 281 respondents， 196 （65.8%） experienced menstrual changes. Among them， 145 （51.6%） had changes in menstrual volume， color and texture， and 109 （38.8%） had changes in menstrual duration or cycle. Decreased menstrual volume （22.1%）， darker color （23.49%）， thicker texture （21.0%）， increased blood clots （16.7%）， and prolonged duration （21.8%） were observed in both groups. The rate of changes in menstrual volume， color， and texture was higher in the positive group （56.8%， 69/110） than that in negative group （37.3%， 76/171） （P

In order to improve the technology based on the existing animation scene stitching modeling, the animation scene stitching modeling is further studied combined with Laplacian equation. The algorithm uses wavelet transform to decompose the animation scene, and then obtains the low-frequency coefficients and high-frequency coefficients of the animation scene; For the high-frequency coefficients, the splicing rules based on the comparison and screening of the convolution results of two Laplacian template operators are adopted; For the low-frequency coefficients, the splicing rule based on Laplace sharpness evaluation function and 8-neighborhood local variance is adopted; Finally, the inverse wavelet transform is used to obtain the diffuse scene mosaic modeling. The experimental results are analyzed combined with subjective and various objective evaluation methods. The results show that the improved algorithm has better splicing effect than the traditional splicing modeling. Animation scene splicing modeling has the advantages of rich edge information and high scene definition.

Novel transparent luminescent glass ceramics with the ability to generate the line emission of Eu2+ ions were successfully prepared. First, Eu2+-doped barium–aluminum–borate oxyfluoride glasses were prepared by high-temperature melting in a reducing atmosphere, and then transparent glass ceramics were obtained by crystallization heat treatment. Fluorescence spectroscopy showed that Eu2+ exhibited only broadband luminescence (FWHM ≈ 136 nm) of the 4f65d1 → 4f7 transition in the glasses. However, after heat treatment, a 359 nm line emission (FWHM ≈ 2.8 nm) from the 4f7 → 4f7 transition of Eu2+ appeared in the glass ceramics. To explore the mechanism of transformation of the optical transition of Eu2+ from 4f65d1 → 4f7 to 4f7 → 4f7, the glasses and glass ceramics were analyzed by fluorescence spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy measurements. The results showed that the alteration in the optical transition of Eu2+ was a result of the Eu2+ ions entering the Ba2+ sites with weak crystal field strength in BaAlBO3F2 (BABF) crystals from the strong crystal field strength glass phase. [ABSTRACT FROM AUTHOR]

A series of Ce3+-doped borosilicate glass scintillators (GABSx) was successfully synthesized in ambient atmosphere. The cut-off wavelength was observed to change slightly in the range of 335–345 nm, which was related to the concentration ratios of Ce3+ to Ce4+ in the GABSx glasses. X-ray absorption near edge structure (XANES) spectra indicate that the valence state of cerium was effectively adjusted using various contents of Si3N4 powder as a reducing agent in the air atmosphere. Under ultraviolet excitation, the glasses show a broadband emission in the 320–600 nm wavelength regions. The PL decay time of the GABSx glasses is around 23 ns, and the maximum PL QY reaches 72.51%. The integral X-ray excited luminescence (XEL) intensity of the GABS1.0 glass is 11.8% of Bi4Ge3O12 (BGO) crystal. Under γ-ray irradiation, the light yield of all glasses exceeds 1000 ph MeV−1 as the Si3N4 concentration increases. The highest light yield of GABS1.0 glass reaches 1279 ph MeV−1 with an energy resolution of 27.1% at 662 keV. All the glasses exhibited a scintillation decay time of approximately 820–873 ns, which is much slower than those of photoluminescence (PL) decay time of about 26 ns by a factor of over 30. Thermally stimulated luminescence (TSL) curves were recorded to explore the nature of the defects in the glasses. Therefore, the potential application of the investigated GABSx glasses is promising, but performance optimization for practical high-energy physics engineering is needed. [ABSTRACT FROM AUTHOR]

A new strategy for fabricating LPL glass is reported based on the defect engineering of glass. Cu+-doped borosilicate glass was melted in a reducing atmosphere. Then, some defects were induced by X-ray radiation, which could trap ultraviolet (UV) light and exhibit long persistent luminescence (LPL) properties. To our knowledge, no previous study has used X-ray radiation induction to obtain LPL of glass. In addition, a highly linear relationship exists between the initial afterglow intensity of the glass and the radiation dose. It could be used as a new radiation detector to measure the radiation dose based on the initial afterglow intensity induced by radiation. To analyze the LPL mechanism, the glass was analyzed by absorption, fluorescence, thermoluminescence (TL), and electron paramagnetic resonance (EPR) measurements. Two types of defects were induced by the X-ray radiation. One type of defect can be eliminated after UV irradiation, and the other is the main cause of LPL. [ABSTRACT FROM AUTHOR]