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First principles calculation of boron diffusion in fcc-Fe
Xin Zhang,Xianglong Li,Ping Wu,Sen Chen,Shiping Zhang,Ning Chen,Xiulan Huai 한국물리학회 2018 Current Applied Physics Vol.18 No.10
The diffusion mechanism of boron in fcc-Fe was studied by first-principles calculations. The sites where B atoms tend to occupy and the diffusion behavior were calculated. Results indicated that the main mechanism of boron diffusion in fcc-Fe was the B–monovacancy complex mechanism instead of the interstitial mechanism. The diffusion coefficient D1 of the B–monovacancy complex mechanism was calculated without considering the backward jump of the B atoms. The calculated D1=1.26×10−4×exp(–2.01eV/kBT) m2·s−1 is consistent with the reported results from experiments.
Yu-cun Pan,Huai-xin Zhang,Qi-dou Zhou 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
In order to provide a complementary perspective to the effects of the maneuvering motions on the unsteady propeller performance, the numerical simulation of the flow field of the hull-rudder- propeller system is performed by Unsteady Reynolds-averaged Naiver-Stokes (URANS) method. Firstly, the flow fields around the submarine model without the presence of propeller in straight ahead motion and the steady diving maneuvers with submergence rudder deflections of 4, 8 and 12 are predicted numerically. The non-uniformity characteristic of the nominal wake field is exacerbated with the increase of submergence rudder angle. Then the flow field around the SUBOFF-G submarine fitted with the 4381 propeller is simulated. The axial, transverse and vertical unsteady propeller forces in different maneuvering conditions are compared. In general, as the submarine maneuvers more violently, the harmonic amplitudes of the unsteady force at the 2BPF and 3BPF increased more significantly than that at BPF.
Wen Qi-Ye,Zhang Huai-Wu,Yang Qing-Hui,Zhang Pei-Xin 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
Artificial neural network has becoming a mainstream technology in the domain of complex materials data analysis. Based on a slag glass-ceramic system we brought forward a virtual sample technology to increase the training samples by fluctuating the content of main compositions in a proper small amplitude. Simulation results proved that a good virtual sample set can not only improve the network’s prediction ability considerably, but can also suppress the “overtraining” phenomenon. Therefore a virtual sample improved neural network model can learn the relationship from a small size experimental data set and give an accurate and stable prediction for the test samples. This is more helpful to the material data analysis and can facilitate the design and development for new materials. Artificial neural network has becoming a mainstream technology in the domain of complex materials data analysis. Based on a slag glass-ceramic system we brought forward a virtual sample technology to increase the training samples by fluctuating the content of main compositions in a proper small amplitude. Simulation results proved that a good virtual sample set can not only improve the network’s prediction ability considerably, but can also suppress the “overtraining” phenomenon. Therefore a virtual sample improved neural network model can learn the relationship from a small size experimental data set and give an accurate and stable prediction for the test samples. This is more helpful to the material data analysis and can facilitate the design and development for new materials.
Pan, Yu-cun,Zhang, Huai-xin,Zhou, Qi-dou The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
In order to provide a complementary perspective to the effects of the maneuvering motions on the unsteady propeller performance, the numerical simulation of the flow field of the hull-rudder- propeller system is performed by Unsteady Reynolds-averaged Naiver-Stokes (URANS) method. Firstly, the flow fields around the submarine model without the presence of propeller in straight ahead motion and the steady diving maneuvers with submergence rudder deflections of 4°, 8° and 12° are predicted numerically. The non-uniformity characteristic of the nominal wake field is exacerbated with the increase submergence rudder angle. Then the flow field around the SUBOFF-G submarine fitted with the 4381 propeller is simulated. The axial, transverse and vertical unsteady propeller forces in different maneuvering conditions are compared. In general, as the submarine maneuvers more violently, the harmonic amplitudes of the unsteady force at the 2BPF and 3BPF increased more significantly than that at BPF.