Zobrazeno 1 - 10
of 224
pro vyhledávání: '"Qunfei Zhang"'
Autor:
Changjiang XIAO, Jinming MA, Hongjun TAO, Qunfei ZHANG, Jianfeng CAO, Yuan LI, Shijie ZHOU, Yulin TANG, Yachao CHEN, Zhengxin LI, Qingyan DONG
Publikováno v:
Jin'gangshi yu moliao moju gongcheng, Vol 44, Iss 2, Pp 193-198 (2024)
To improve the performance of PcBN composites prepared under high temperature and high pressure, mixed cBN particle sizes ranging from 0 to 0.5 μm and 0.5 to 1.0 μm were used as the raw material, Al-Ti-Al2O3 was used as the binder and the carbon na
Externí odkaz:
https://doaj.org/article/92f11c8aab63487a875c4c2ab8d59224
Autor:
Jinming MA, Changjiang XIAO, Hongjun TAO, Qunfei ZHANG, Lihui TANG, Jianfeng CAO, Yuan LI, Shijie ZHOU, Yulin TANG, Yachao CHEN, Zhengxin LI
Publikováno v:
Jin'gangshi yu moliao moju gongcheng, Vol 44, Iss 2, Pp 179-184 (2024)
The monolithic PcBN composite tool materials were prepared at 5.5 GPa and 1450 ℃ with different contents of Ti3AlC2 as the binder phase. The effects of different mass fractions of Ti3AlC2 on the phase composition, microstructure, and mechanical pro
Externí odkaz:
https://doaj.org/article/81c150b3d2d540b4a9ac5282c2d30ac7
Publikováno v:
Remote Sensing, Vol 16, Iss 19, p 3752 (2024)
Gridless direction of arrival (DOA) estimation methods have garnered significant attention due to their ability to avoid grid mismatch errors, which can adversely affect the performance of high-resolution DOA estimation algorithms. However, most exis
Externí odkaz:
https://doaj.org/article/f8d08d3c5892430b83e0157e58f474d1
Publikováno v:
Remote Sensing, Vol 16, Iss 13, p 2442 (2024)
Although recent data-driven Underwater Acoustic Target Recognition (UATR) methods have played a dominant role in marine acoustics, they suffer from complex ocean environments and rather small datasets. To tackle such challenges, researchers have reso
Externí odkaz:
https://doaj.org/article/6a70eed0ed0743a69c2bed835635e266
Publikováno v:
IET Radar, Sonar & Navigation, Vol 17, Iss 4, Pp 617-627 (2023)
Abstract For the integrated system of underwater detection and communication, an emitted waveform should satisfy both detection and communication requirements. The signal processing method at the receiving end must also accomplish target detection an
Externí odkaz:
https://doaj.org/article/a815323ef46245f18aed05ad61c33702
Publikováno v:
Mathematics, Vol 12, Iss 4, p 545 (2024)
In practical applications, the hydrophone array has element position errors, which seriously degrade the performance of the direction of arrival estimation. We propose a direction of arrival (DOA) estimation method based on sparse Bayesian learning u
Externí odkaz:
https://doaj.org/article/04851d6ca5304511b2a069b44529f6df
Publikováno v:
Mathematics, Vol 12, Iss 1, p 45 (2023)
To improve the data utilization of the sensor array and direction-of-arrival-(DOA)-estimation performance for coherent signals, a DOA-estimation method with a modified spatial-smoothing technique is proposed. The covariance matrix of the received dat
Externí odkaz:
https://doaj.org/article/5368a1547b224288a39bfe50fdf5c957
Publikováno v:
Sensors, Vol 23, Iss 23, p 9422 (2023)
To reduce the influence of gain-phase errors and improve the performance of direction-of-arrival (DOA) estimation, a robust sparse Bayesian two-dimensional (2D) DOA estimation method with gain-phase errors is proposed for L-shaped sensor arrays. The
Externí odkaz:
https://doaj.org/article/18032d02fdd04c389b6cad15927758a2
Publikováno v:
Engineering, Vol 8, Iss , Pp 12-17 (2022)
Externí odkaz:
https://doaj.org/article/261c1b336d774df88460741f7734634d
Publikováno v:
IET Radar, Sonar & Navigation, Vol 16, Iss 1, Pp 91-102 (2022)
Abstract Active localization of a stationary target is one key issue in applications of bistatic sonar based on bistatic range (BR) measurement. However, the complex underwater environment makes achieving the synchronization between the transmitted s
Externí odkaz:
https://doaj.org/article/6bbfeb4fca354bf7b2c43ec72a4086bd