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Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Engineering Science Research & Application is the property of Omniscient Pte. Ltd. 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 Engineering Science Research & Application is the property of Omniscient Pte. Ltd. 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.)

Ultrasonic testing is one of the commonly used methods in the field of non-destructive testing. At present, in the detection method of metal bars there is a single defect feature extraction method, which wsually leads to the problem of limited quality inspection accuracy. In order to increase the diversity of defect feature extraction and improve the accuracy of metal bar quality inspection, a metal bar defect analysis system based on ultrasonic testing was designed. First, a hardware platform was built, to support signal acquisition, waveform storage, and echo upload. Then, a neural network-based defect classification method for metal bars and a feature extraction method for corresponding defect types are proposed. Finally, the experimental model and the proposed method were verified in experimental tests. The results show that in the system there are errors less than 2% for the extraction of metal bar defect features. The high metal bar defect classification accuracy and metal bar defect feature extraction accuracy improve the reliability of metal bar quality inspection and accuracy. It can provide useful information for the quality inspection of metal bars. [ABSTRACT FROM AUTHOR]

Copyright of Telecommunication Engineering is the property of Telecommunication 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 Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic 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 Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers 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.)

Copyright of Yellow River is the property of Editorial Board of Yellow River 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 Mine Automation is the property of Industry & Mine Automation 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 Journal of Mine Automation is the property of Industry & Mine Automation 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 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 Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine 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.)

Based on bearing capacity tests of prefabricated square pile in Jinan rail transit R1 construction, bending capacity of prefabricated square pile with socket and spigot joint was obtained, which was determined by the pile joint. The ultimate bending limit states of prefabricated square pile including the deflection and crack width limits and pile joint yielding were proposed. Formula for computing the bending capacity was deduced and process of deformation was divided. With numerical analysis method, bending performance of prefabricated square piles was studied and model of bending performance was built, the correctness of Tresca yield criterion for judgment of pile joint yield was proved and the explicit expression of bending performance for pile joint was derived, and the correctness of the explicit expression was verified through experimental study. The results show that deflection and crack width are far less than limits when pile joint reaches yield strength. The stress in the upper compression part of the pile joint is transmitted to the web and upper flange by the pin bolt initially, then the web and upper flange directly bear compressive stress when web and upper flange are in contact with end plate. The stress in the lower tension part is transmitted to the web and lower flange by the pin bolt. The compression side web and lower flange bear tensile stress and tend to yield firstly, which is the basis for calculating the bending bearing capacity of the pile joint. The second principal stress is smaller two orders in magnitude than the first and the third principal stress. According to distribution of compression zone of pile joint, stress distribution on compression zone is inverse triangle when pile joint reaches yield strength and can be used to determine the point of resultant force. [ABSTRACT FROM AUTHOR]