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通过建立计算预制装配式型钢混凝土（PSRC）梁抗剪承载力的智能模型，在一定程度上提高了计算精度与适用性。基于BP人工神经网络算法，通过对影响PSRC梁抗剪承载力的相关参数进行梳理，选取14个主要影响参数作为输入层，以试算法确定隐含层节点数为5，初步构建了3层结构人工神经网络系统；以收集的76组试验数据作为学习样本，对构建的神经网络系统进行训练，建立了对PSRC梁及SRC梁抗剪承载力计算的N14-5-1智能模型。使用智能模型对6个PSRC梁构件及6个SRC梁构件进行抗剪承载力计算，并通过与规范公式计算结果、试验结果的对比分析，证明了智能模型具有良好的计算精度及较好的泛化能力，具有一定的工程参考意义。运用Garson算法对输入参数进行敏感性分析，结果表明箍筋间距、型钢屈服强度、箍筋屈服强度、型钢腹板含钢率对抗剪承载力影响较大。随着研究试验的开展，在收集更多具有代表性的试验数据以扩充学习样本后，可对智能模型进一步优化。

为研究超出规范范围材料强度的高强钢管高强混凝土短柱承载力在规范范围外拓展应用的相关问题，搜集61组试验及有限元数据，利用神经网络智能技术研究了在不同的截面尺寸、高强材料、含钢率、偏心率和长细比等影响因素下的高强钢管高强混凝土短柱的极限承载力及荷载-位移曲线，将承载力预测结果与规范EC4、规范ACI及规范GJB 4142—2000的计算结果进行了对比分析，并预测了试件的荷载-位移曲线，对各阶段各模型的切线刚度进行了分析研究。研究结果表明：所述规范可以在一定程度上继续延伸使用，而神经网络智能模型不仅与试验数据吻合度较高、精确度高，还考虑了规范没有考虑的约束效应减弱及两种材料强度匹配程度对承载力的影响，承载力会随着混凝土强度和钢材强度的提高而减缓增强速度；神经网络智能模型非常适合用于预测高强钢管高强混凝土短柱承载力，可以为实际工程和规范延伸拓展提供设计参考；神经网络智能模型相比于现有组合构件应力-应变理论公式会更加简便准确，以切线刚度的对比结果可知，其可以更加准确地反映和再现轴压作用下高强钢管高强混凝土短柱荷载-位移曲线的特征，对构件的力学性能研究有一定的参考作用。

通过建立计算预制装配式型钢混凝土（PSRC）梁抗剪承载力的智能模型，在一定程度上提高了计算精度与适用性。基于BP人工神经网络算法，通过对影响PSRC梁抗剪承载力的相关参数进行梳理，选取十四个主要影响参数作为输入层，以试算法确定隐含层节点数为5，初步构建了三层结构人工神经网络系统；以收集的76组试验数据作为学习样本，对构建的神经网络系统进行训练，建立了对PSRC梁及SRC梁抗剪承载力计算的N14-5-1智能模型。使用智能模型对6个PSRC梁构件及6个SRC梁构件进行抗剪承载力计算，并通过与规范公式计算结果、试验结果的对比分析，证明了智能模型具有良好的计算精度、及较好的泛化能力，具有一定的工程参考意义。运用Garson算法对输入参数进行敏感性分析，结果表明箍筋间距、型钢屈服强度、箍筋屈服强度、型钢腹板含钢率对抗剪承载力影响较大。随着研究试验的开展，在收集更多具有代表性的试验数据以扩充学习样本后，可对智能模型进一步优化。

Copyright of Journal of Shenzhen University Science & Engineering is the property of Editorial Department of Journal of Shenzhen University Science & Engineering 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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Copyright of Research of Soil & Water Conservation is the property of Institute of Soil & Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources 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 Mountain Research (10082786) is the property of Mountain Research Editorial Office 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.)

This study investigates the variations in precipitation phases on the Tibetan Plateau ( TP) from 1979 to 2020. Utilizing the Third Pole region′s high-resolution (1 / 30°, daily) surface meteorological data (TPMFD) and a method based on elevation and meteorological conditions, we analyzed the snowfall- precipitation ratio ( SPR) spatiotemporal characteristics on the TP. Key findings include: ① Significant spatial differences in SPR, with higher values in the west and lower in the east. ② An overall downward trend in SPR, decreasing at an average rate of 1. 11% per decade ( p < 0. 001). ③ Both cold and warm seasons exhibit increases in rainfall and decreases in snowfall and SPR. However, the rates of change are more pronounced in the warm season. ④ Snowfall is comparable in the cold and warm seasons in the east and west of the plateau. In contrast, the central plateau experiences predominant snowfall during the warm season. About 90% of the annual rainfall occurs in the warm season, and the proportion of warm season snowfall to annual snowfall is decreasing ( - 0. 29% per decade) in most plateau regions. These findings provide valuable insights for regional climate change and water science research. [ABSTRACT FROM AUTHOR]

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[Objective] The aims of this study are to explore the impact of artificial terrain (terraces) on topographic indicators, analyze the impact of building terraces on soil erosion process, and provide scientific basis for the determination of terraces measures in soil erosion assessment. [Methods] The high-resolution DEM data of Zhifanggou watershed were obtained through UAV aerial photogrammetry. Through simulating the original slope surface and constructing horizontal terraces, slope, slope length, slope length and steepness factor (LS), specific catchment area (SCA) and topographic wetness index (TWI) from these data were extracted, and the changes of these factors were analyzed to understand the impact of terraces on erosional terrain. [Results] The construction of terraces reduced the slope, cut off the slope length and decreased the LS factor. With the increase of terrace area ratio, slope, slope length and LS factor all showed a decreasing trend. In the terraced area, the slope, slope length and LS factors were roughly distributed along the contour line in a strip; in the non-terraced area, the slope, slope length and LS factors gradually increased from the water dividing line downward, and then gradually slowed down to the valley bottom. The construction of terraces reduced the SCA and increased the TWI. The spatial pattern of SCA was similar to that of slope length, the value was smaller in the higher part, and was larger in the lower part. The spatial distribution pattern of TWI in terraces was opposite to that of slope, and the spatial distribution pattern of TWI in non-terraces was similar to that of SCA. At the micro scale, the slope length, LS factor, SCA and TWI all tended to increase in the direction of slope decline of the field surface. When constructing or maintaining the terraces, the field surface should be kept as horizon as possible or a slight reverse slope. According to the influence of terraces on the LS factor, the engineering measure factor value of terraces in the study area should be taken as 0.26～0.37. [Conclusion] The construction of terraces has a great contribution to soil and water conservation in the hilly areas of the Loess Plateau, and can provide a reference for the construction of terraces and soil erosion assessment in the hilly areas of the Loess Plateau. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Practical Medicine / Shiyong Yixue Zazhi is the property of Journal of Practical Medicine Editorial Office 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 Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board 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 Journal of Geodesy & Geodynamics (1671-5942) is the property of Editorial Board Journal of Geodesy & Geodynamics 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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Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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 Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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 Journal of Modern Medicine & Health is the property of Journal of Modern Medicine & Health 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 evaluate the induction role of subinhibitory concentrations of 3-lactams in the production of Staphylococcus aureus lipoprotein-like protein (Lpl). Methods We selected the most predominant multidrug resistant clonal strains of sequence type (ST) 239 with SCCmec type methicillin-resistant S. aureus (ST239-MRSA-) prevailed in China as subjects and then tested their susceptibility against antibiotics. After that all the operations involved were carried out on the basis of detecting the antibiotic sensitivity of the strain, SDS-PAGE were used to analyze the bacterial proteins of selected strains post-treated with sub inhibitory concentrations of oxacillin. Western blot were used to identify the prepared recombinant Lpl-His proteins and the polyclonal antibodies against 1p-H. Results Six strains of ST239 methicillin-resistant Staphylococcus aureus (MRSA) isolated from clinic were selected in the experiment. Compared with 1030 ST239-MRSA-Il strains.t037 strains showed opposite resistance to rifampicin and trimethoprim/ sulfame thoxazole in the antimicrobial susceptibility test. However, both types of ST239-MRSA can produce a 30kDs protein under the induction of the subinhibitory concentrations of oxacillin. The protein induced by oxacillin was demonstrated as Staphylococcus aureus Lpl by Western blot.and its induction had dose-dependent effect. Conclusion The subinhibitory concentrations of oxacillin can induce the production of S. aureus L.pl.whereas the role of this induced protein in the pathogenicity of S. aureus infection in vivo is worth of future investigation. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) 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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Copyright of Mountain Research (10082786) is the property of Mountain Research Editorial Office 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 analyze the characteristics of papers published in Organ Transplantation in the past ten years. Methods The academic papers published in Organ Transplantation from January 2010 to December 2019 were retrieved from China National Knowledge Infrastructure (CNKI). The publication volume, the funded paper ratio, authors, research institutions and keywords were analyzed by information visualization software CiteSpace 5.3 and VOSviewer 1.6. Results From 2010 to 2019, a total of 919 academic papers were published in Organ Transplantation, with an average annual publication volume of 92, showing an overall stable trend. The funded paper ratio and the ratio of papers with funding support at the provincial level or above increased year by year, reaching 100% in 2019. High-yield authors mainly formed two research teams led by Shi Bingyi and Chen Guihua respectively. The first authors were distributed across China. In recent years, as many as 58 programmatic papers were published by national academic institutions, especially signed by Branch of Organ Transplantation of Chinese Medical Association. The average number of authors per paper was 4.94 in Organ Transplantation, and the proportion of papers contributed by two or more authors remained above 90% in recent years. According to the analysis of research institutions, the average number of institutions per paper was 1.60 in Organ Transplantation. Keyword co-occurrence network analysis demonstrated that liver transplantation, renal transplantation and organ transplantation were the research hotspots in the field of organ transplantation. Keyword cluster analysis showed that research mainly focused on 9 fields, such as liver transplantation, renal transplantation, organ transplantation, organ donation, posttransplantation complications, transplantation immunity, end-stage liver disease, xenotransplantation and stem cell transplantation. Keyword burst analysis showed that xenotransplantation, α-1,3-galactose, transplantation immunity, apoptosis, donor specific antibody (DSA), antibody-mediated rejection (AMR) and flow cytometry were the research hotspots. Conclusions The authors that publish academic papers in Organ Transplantation come from major transplantation centers all over the country. The papers of Organ Transplantation cover the research hotspots of each branch in the field of organ transplantation, and include a large quantity of programmatic papers signed and published by national academic institutions, which show the frontier hotspots and the highest level of research in the field of organ transplantation in China, making Organ Transplantation an excellent academic journal. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Geoscience is the property of Natural Gas Geoscience 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.)