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Yuxiao Wang,Guangyin Du,Songyu Liu,Dingwen Zhang 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.10
The resonance probe compaction (RPC) method is an effective technique for particular soils, which mainly includes sandy and loess. However, the application of RPC on contaioning clay interlayer area has never been seen. In this study, a successful case of using the RPB method to treat the clay interlayer foundation is presented in detail. The test results of Huaiyan high-speed railway construction project are introduced. The test is divided into the laboratory test and the field test, mainly including standard penetration test (SPT), cone penetration test (CPT) and seismic wave cone penetration test (SCPT). The test results indicated that the cone resistance of silt and silty sand layers increased to an average of 2.13 times compared with an average of 4.39 MPa before treatment, and the sleeve friction whose initial average is 54.17 kPaincreased to an average of 1.74 times. The existence of the clay interlayer does not affect the consolidation and drainage of the silt layer and the silt sand layer, and after the construction, the excess pore water pressure around the vibration point can be dissipated by more than 90% within 15 minutes. After reinforcement, the standard penetration number of subsoil, increased by about 15% − 95% compared with an average of 19 blows before treatment and the clay particle content of some clay interlayers are reduced to less than 10%. The shear wave velocity of the subsoil in the treatment depth increased by about 15% − 48% compared with 140 m/s before treatment. The RPC method was successful for the coastal phase liquefaction foundations.
Wang Xiaoqing,Xiang Yang,Guo Zhiyong,Xia Xuebao,Shi Yuxiao,Xue Peng,Wu Shaowei 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
An experimental method of measuring acoustic surface radiation resistance is developed. The principle of the method is based on obtainingsource velocity and field pressure generated by the source. To measure surface radiation resistance, measuring probe was developedand measuring system was set up. Then, major factors that affect measurement accuracy is discussed and great improvements aregot. After that, experiments of measuring baffled circular piston were conducted to analyze its applicable frequency range. To verifyactual application effect, experiments of measuring the tube and cylinder heads of a diesel engine were performed. The results show thatthis measuring system can obtain resistance values in the frequency range from 460 to 1900 Hz with high precision. The measuring systemhas features of simple operation, convenient use, and high accuracy. Therefore, it can be used to determine surface resistance matrixof various structures.
Wen, Feng,Li, Qiang,Li, Rui,Liu, Ling,Wang, Tao,Liu, Li,Wu, Tao,Li, Yuxiao The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper presents a new type of a transmitter coil for wireless power transfer (WPT) to assist in the achievement of a constant output power and in the reduction of magnetic field leakage under misaligned electric vehicle (EV) wireless-charging conditions. The proposed DDP coil is an improvement upon the conventional DD coil and can be adaptively reconfigured depending on the misalignment of different sizes or types of receiver coils. The reconfigurable resonant circuit is designed to compensate various coil structures and to maintain a high-energy efficiency. The reconfiguration strategy is presented by studying the characteristics of the magnetic field and mutual inductance of the coils. A precise human anatomic model and a full-scale Tesla EV model are built to evaluate the magnetic field leakage and human exposure to the WPT system. Simulation results show that the power transfer efficiency (PTE) reaches 99.16% and that the maximum electric field induced in humans is -1.11 dBV/m, while the transfer power is 6.6 kW with a 12 cm lateral offset on both the x-axis and y-axis. The effectiveness of the proposed type of transmitter coil is verified through simulation and experimental results.
Yu Xiao,Bing Wang,Yulian Chen,Lingqiang Chen,Zhenkai Lou,Zhiqiang Gong 대한척추신경외과학회 2023 Neurospine Vol.20 No.1
Objective: To identify potential risk factors for cerebrospinal fluid (CSF) leakage after craniovertebral junction (CVJ) anomaly surgery and to provide a reference for clinical practice. Methods: Sixty-six patients who underwent elective CVJ anomaly surgery during a 6-year period (April 2013 to September 2019) were retrospectively included. Research data were collected from the patients’ medical records and imaging systems. Patients were divided into CSF leak and no CSF leak groups. Univariate tests were performed to identify potential risk factors. For statistically significant variables in the univariate tests, a logistic regression test was used to identify independent risk factors for CSF leakage. Results: The overall prevalence of CSF leakage was 13.64%. Univariate tests showed that a basion-dental interval (BDI) > 10 mm and occipitalized atlas had significant intergroup differences (p < 0.05). Multivariate analysis indicated that a BDI > 10 mm was an independent risk factor for CSF leakage, and patients with CVJ anomalies with a BDI > 10 mm were more likely to have postoperative CSF leaks (odds ratio, 14.67; 95% confidence interval, 1.48–30.88; p = 0.004). Conclusion: It is necessary to maintain vigilance during CVJ anomaly surgery in patients with a preoperative BDI > 10 mm to avoid postoperative CSF leaks.