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Copyright of Reviews of Geophysics & Planetary Physics is the property of Editorial Office of Reviews of Geophysics & Planetary Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

OBJECTIVE: To observe the expression of T lymphocyte subsets in peripheral blood of patients with acquired immunodeficiency syndrome (AIDS) complicated with pneumocystis pneumonia (PCP), and to analyze its correlation with therapeutic effect of compound sulfamethoxazole. METHODS: Data of patients with AIDS complicated with PCP admitted into the hospital from 2018 to 2020 were retrospectively collected. All patients were treated with compound sulfamethoxazole for 3 weeks. After propensity score matching according to 2 ∶ 1, 88 effective patients and 38 ineffective patients were included, a total of 126 cases were set as the observation group; in addition, the data of 63 AIDS patients without PCP admitted into the hospital during the same period were collected and set as the control group. Patients’ medical records were analyzed, and the baseline data and laboratory indicators of the patients were counted. The expression of T lymphocyte subsets (CD3 +, CD4 +, CD8 +, CD4 + / CD8 +) in peripheral blood in patients with AIDS complicated with PCP and its correlation with therapeutic effect of compound sulfamethoxazole were mainly analyzed. RESULTS: The proportion of systemic anti HIV treatment of patients in the control group was the highest, followed by the effective group, and the ineffective group was the lowest, the differences were statistically significant (P<0. 05). The percentages of serum LDH and CD8 + T lymphocytes in the ineffective group were the highest before treatment, followed by the effective group, and the control group was the lowest; the percentage of CD4 + T lymphocytes and CD4 + / CD8 + in the control group were the highest, followed by the effective group, and the ineffective group was the lowest, the differences were statistically significant (P< 0. 05); there was no statistical significant difference in other data and indicators between different groups (P>0. 05). Through Logistic regression analysis, high LDH and high percentage of CD8 + T lymphocytes before treatment were the risk factors for the ineffective treatment of compound sulfamethoxazole in patients with AIDS complicated with PCP (OR>1, P<0. 05), systematic anti HIV treatment and high percentage of CD4 high percentage of CD8 + T lymphocytes before treatment were the risk factors for the ineffective treatment of compound sulfamethoxazole in patients with AIDS complicated with PCP (OR>1, P<0. 05), systematic anti HIV treatment and high percentage of CD4 + T lymphocytes, high CD4 + / CD8 + were its protective factors (OR<1, P<0. 05). The ROC curve was drawn, and the results showed that the AUC of CD4 +, CD8 +, CD4 + / CD8 + in predicting the therapeutic effect of compound sulfamethoxazole in patients with AIDS complicated with PCP were > 0. 70, all had certain prediction value. CONCLUSIONS: CD4 +, CD8 +, CD4 + / CD8 + are abnormally expressed in patients with AIDS complicated with PCP, and are related to the therapeutic effect of compound sulfamethoxazole. T lymphocytes, high CD4 + / CD8 + were its protective factors (OR<1, P<0. 05). The ROC curve was drawn, and the results showed that the AUC of CD4 +, CD8 +, CD4 + / CD8 + in predicting the therapeutic effect of compound sulfamethoxazole in patients with AIDS complicated with PCP were > 0. 70, all had certain prediction value. CONCLUSIONS: CD4 +, CD8 +, CD4 + / CD8 + are abnormally expressed in patients with AIDS complicated with PCP, and are related to the therapeutic effect of compound sulfamethoxazole. [ABSTRACT FROM AUTHOR]

Objective To establish a rapid prediction method of the antioxidant activity in aqueous extract solutions of Melastoma dodecandrum based on ultraviolet spectroscopy and partial least squares regression algorithm. Methods The DPPH free radical scavenging effect was used to characterize the antioxidant activity of aqueous extract solutions of Melastoma dodecandrum. The ultraviolet spectra of 190-600 nm were collected. The partial least squares regression model of antioxidant activity was established after optimizing the wavelength range and preprocessing method. The software was devised using Visual Basic as the integrated development environment to provide a convenient tool for the rapid determination of antioxidant activity. Results The optimal partial least squares regression model was established based on 200-290 nm as wavelength range and unit variance scaling as preprocessing method. The correlation coefficient of calibration, root mean square error of estimation, root mean square error of cross-validation was 0.887, 2.20% and 2.17%, respectively. The correlation coefficient of validation, root mean square error of prediction was 0.868, 2.08%. The average predicted recovery was 100.1±2.3%. With the predictive function in the software, the antioxidant activity of aqueous extract solution of Melastoma dodecandrum can be calculated automatically within 2 s after collecting the ultraviolet spectra. Conclusions This study provides a rapid method for the prediction of antioxidant activity in aqueous extract solutions of Melastoma dodecandrum. [ABSTRACT FROM AUTHOR]

In view of the low efficiency of manual processing of repeated power supply security control image, based on the perceptual Hash algorithm (PHA), PHA based on block discrete cosine transform hash (BDCT) was proposed, abbreviated as BDCT-PHA. BDCT-PHA was used for image duplication removal. The algorithm could process the JPEG compressed image, and had high duplication removal accuracy and low misjudgment rate. Then, the ResNet network structure was improved, and the convolutional neural network (CNN) was selected for image classification. Firstly, the image was transformed into the format of VOC data set, and then trained. This method prevented the gradient disappearance when the network model was deepened, and improved the classification efficiency while reducing the amount of calculation. Simulation results show that the proposed method can accurately identify duplicate images and indicate the number of similar images. When classifying power supply safety management and control images, the loss function value can converge to 4.785% and the classification accuracy is as high as 94.46%. [ABSTRACT FROM AUTHOR]

In many high-power AC drives, with the increase of the switching frequency of the converter, the generated harmonic and electromagnetic interference(EMI)noise are getting higher and higher. Aiming at the serious problems of harmonics and EMI noise of three-level neutral-point-clamped(NPC)high-frequency converters, based on the space vector pulse width modulation(SVPWM)strategy, a random SVPWM method based on Markov chain was proposed. In this method, the random number generated by Markov chain could be applied to SVPWM strategy, so that the actual frequency change could be more randomly and evenly distributed on both sides of the theoretical switching frequency, with the output voltage harmonic noise of the actual system with also dispersed in a wide frequency band, and the EMI noise of the converter was also reduced. The simulation results show that the modulation strategy proposed in this paper has a significant improvement in the harmonic distribution compared with the traditional SVPWM strategy, and the conducted EMI noise is also reduced from 140 dB/μV to 120 dB/μV. [ABSTRACT FROM AUTHOR]

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)