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详细讨论了误码发生服从泊松分布的条件下 ,以实际误码个数除以传输的总码数来估计误码率这种方法的估计特征 ;给出了测量结果的精度、可靠性与测量时间内平均误码个数及测量时间的关系 ,可为实际测量中测量时间的选取提供参考

Copyright of China Harbour Engineering is the property of Editorial Office of China Harbour 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 China Harbour Engineering is the property of Editorial Office of China Harbour 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.)

In order to deal with the overflow accident caused by gravity displacement, it is necessary to understand the conditions of gravity displacement, analyze the gravity displacement window to judge whether gravity displacement occurs in the down-hole, and adopt the corresponding treatment method. The critical point experiment of gas-liquid gravity displacement was carried out by the self-developed well-formation gravity displacement experimental device. Based on the theory and experimental analysis, the formation gravity displacement window was quantitatively calculated, and the critical point pressure curve of the gravity displacement window was fitted. The error between the fitting formula and the measured value is less than 10% . Under this experimental conditions, when the drilling fluid density is 0. 998 g/cm³, the gas-liquid gravity displacement window is - 5 800 ~ 10. 6 Pa, and the liquid-liquid formation gravity displacement window is - 1 192 ~ 16. 6 Pa. The results show that the gravity density difference between gas and fluid is linear, and the actual gravity displacement window is much higher so that the influence of gravity displacement window should be considered during drilling engineering. In conclusion, the prevention method of gravity displacement and the corresponding treatment method of gravity displacement overflow are put forward. [ABSTRACT FROM AUTHOR]

Copyright of Petroleum Geology & Oilfield Development in Daqing is the property of Editorial Department of Petroleum Geology & Oilfield Development in Daqing 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 Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu 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 Chinese Journal of Clinical Healthcare is the property of Chinese Journal of Clinical Healthcare 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 Zhejiang Electric Power is the property of Zhejiang Electric Power 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.)

Based on the foundation trench excavation test project of submarine tunnel in Shenzhen-Zhongshan river crossing channel project (hereinafter referred to as " Shenzhen-Zhongshan Link"), the application of multi-beam sounding system in back silting monitoring of foundation trench and slope stability analysis of immersed tube installation was introduced. The siltation amount calculation method and the difference color block diagram comparison method were used to monitor and analyze the back silting change of the foundation trench, and the section diagram analysis method and the three-dimensional graph comparison method were used to analyze the slope stability change, which realizes the reasonable analysis of the back silting of the tunnel foundation trench and the slope stability, and provides reasonable reference data for the future design and construction. [ABSTRACT FROM AUTHOR]

Copyright of Art Panorama is the property of Art Panorama 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 Clinical Neurosurgery / Linchuang Shenjingwaike Zazhi is the property of Editorial Board of Journal of Clinical Neurosurgery 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 Mass Communication Research is the property of Guoli Zhengzhi Daxue Xinwenxue Yanjiusuo 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 Clinical Neurosurgery / Linchuang Shenjingwaike Zazhi is the property of Editorial Board of Journal of Clinical Neurosurgery 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.)