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文章根据介质膜滤波器为最小相位滤波器的特点,提出了一种从介质膜滤波器的幅度响应重构出相位响应,然后求出它的群速度延迟以及色散的数值方法.最后,实验验证了理论计算结果.

The value of the slope ratio of the foundation trench for offshore immersed tube tunnels has a significant impact onthe engineering economy and construction risks. Dredging of waterways near the foundation trench may lead to abnormalsiltation of the foundation trench, affecting the stability of the foundation trench slope and thus affecting construction progress.By conducting in -situ trial excavation tests in the tunnel site area and numerical simulation analysis of adjacent waterwaydredging, the stability and siltation of the foundation trench slope were analyzed. This provides technical support for the designand construction of the foundation trench scheme for the Hongkong-Zhuhai-Macao Bridge immersed tube tunnel. The researchresults show that: 1) Observations of the flood season impact cycle shows that the foundation trench slopes with slope ratios of1:5, 1:6, 1:8, and 1:10 have no structural changes, and are overall stable. 2) The bottom area of the trial excavation trenchshows a continuous siltation state, while the outer area of the slope shows an alternating phenomenon of siltation and erosion,but the overall change amplitude is not significant. 3) The closer the waterway dredging is to the position of the foundationtrench, the greater the impact on the siltation of the foundation trench. The location where the foundation trench siltation isthickest appears at the intersection of the foundation trench and the waterway [ABSTRACT FROM AUTHOR]

Copyright of Journal of Xi'an Jiaotong University (Medical Sciences) is the property of Xian Jiaotong University 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.)

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Objective: To investigate the predictive value of endotoxin (Endotoxin), procalcitonin (PCT) combined with neutrophil to lymphocyte ratio (NLR) in predicting urinary sepsis in patients after percutaneous nephrolithotomy (PCNL). Methods: 750 patients who underwent PCNL in the Department of Urology Surgery, The Second Affiliated Hospital of Xi’an Medical College and The First Affiliated Hospital of Air Force Military Medical University from May 2020 to May 2023 were selected as study subjects. Patients were divided into urinary sepsis group (n=45) and non sepsis group (n=705) according to the occurrence of urinary sepsis. The levels of serum Endotoxin, PCT, neutrophils and lymphocytes before PCNL were detected, and NLR was calculated. Serum Endotoxin, PCT levels and NLR were compared in two groups. The factors affecting the risk of urinary sepsis in patients after PCNL were analyzed by multivariate Logistic regression model. The clinical efficacy of serum Endotoxin, PCT combine with NLR in predicting urinary sepsis in patients after PCNL were analyzed by drawn receiver operating characteristic (ROC) curve. Results: Compared with non sepsis group, the serum Endotoxin, PCT and NLR in urinary sepsis group were higher (P＜0.05). Multivariate Logistic regression model analysis showed that, elevated serum Endotoxin, elevated PCT, elevated NLR, positive urine white blood cells, preoperative fever and staghorn calculi were independent risk factors for urinary sepsis in patients after PCNL (P＜0.05). The results of ROC curve analysis showed that, the area under the curve (AUC) of serum Endotoxin, PCT combine with NLR in predicting urinary sepsis in patients after PCNL was 0.913, which was higher than that of the above indicators alone. Conclusion: The increase of serum Endotoxin, PCT and NLR before PCNL may be relate to the occurrence of urinary sepsis in patients after PCNL. Elevate serum Endotoxin and PCT levels, elevate NLR, preoperative fever, positive urine white blood cells and staghorn calculi are risk factors for urinary sepsis in patients after PCNL. Serum Endotoxin, PCT combine with NLR detection has a high predictive value for urinary sepsis in patients after PCNL. [ABSTRACT FROM AUTHOR]

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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.)

Objective To compare the computed tomography (CT) signs of Corona Virus Disease 2019 (COVID-19) and pneumocystis jirovecii pneumonia (PJP),and improve the level of differential diagnosis.Methods The first CT data of 32 COVID-19 patients admitted to Bao Ding No.1 Central Hospital and Bao Ding infectious Diseases Hospital of Hebei Province and 10 PJP patients admitted to Bao Ding No.1 Central Hospital of Hebei Province from December 2019 to March 2020 were collected, and their CT signs were compared.Results The COVID-19 patients were mainly characterized by multiple lung lesions in subpleural area, and their probability of pleural parallel sign and vascular thickening sign were significantly higher than those of the PJP patients, while the probability of pulmonary balloon sign, lunar arch sign and map sign were significantly lower than those of the PJP patients, with statistical significance (P<0.05) .Conclusion COVID-19 and PJP not only share common CT features but also have typical imaging features and chest CT plays an important role in the differential diagnosis of COVID-19 and PJP. [ABSTRACT FROM AUTHOR]