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4,897 results on '"Huang, Juan"'

1. Normalized ground states for the mass supercritical Schr\'{o}dinger-Bopp-Podolsky system: existence, limit behavior, strong instability

Author

Huang, Juan and Wang, Sheng

Subjects
Mathematics - Analysis of PDEs
Abstract

This paper concerns the normalized ground states for the nonlinear Schr\"{o}dinger equation in the Bopp-Podolsky electrodynamics. This equation has a nonlocal nonlinearity and a mass supercritical power nonlinearity, both of which have deep impact on the geometry of the corresponding functional, and thus on the existence, limit behavior and stability of the normalized ground states. In the present study, the existence of critical points is obtained by a mountain-pass argument developed on the $L^2$-spheres. To be specific, we show that normalized ground states exist, provided that spherical radius of the $L^2$-spheres is sufficiently small. Then, by discussing the relation between the normalized ground states of the Schr\"{o}dinger-Bopp-Podolsky system and the classical Schr\"{o}dinger equation, we show a precise description of the asymptotic behavior of the normalized ground states as the mass vanishes or tends to infinity. Finally, the strong instability of standing waves at the mountain-pass energy level is studied by constructing an equivalent minimizing problem. Also, as a byproduct, we prove that the mountain-pass energy level gives a threshold for global existence based on this equivalent minimizing problem.

Published
2024

2. Overview of recent experimental results on the EAST Tokamak

Author

Gong, X, Team and Collaborators, on behalf of EAST, Team:, The EAST, Song, Yuntao, Wan, Baonian, Li, Jiangang, Wan, Yuanxi, Wu, Xinchao, Liu, Fukun, Chen, Junling, Hu, Jiansheng, Xu, Guosheng, Lu, Kun, Gong, Xianzu, Xiao, Bingjia, Wu, Yu, Gao, Xiang, Yao, Damao, Xiang, Nong, Hu, Liqun, Hu, Chundong, Wu, Jiefeng, Shen, Biao, Gao, Ge, Huang, Yiyun, Xu, Liuwei, Zhang, Qiyong, Bae, Cheonho, Cao, Bin, Cao, Lei, Chang, Jiafeng, Chen, Dalong, Chen, Ran, Chen, Xiaojiao, Chen, Yebin, Chen, Yue, Cheng, Yunxin, Cheng, Yong, Ding, Bojiang, Ding, Fang, Ding, Rui, Du, Shijun, Duan, Yanmin, Fu, Jia, Gao, Daming, Gao, Wei, Gu, Yongqi, Guo, Bin, Guo, Fei, Guo, Yong, Han, Xiaofeng, He, Shiying, Hu, Ailan, Hu, Chang, Hu, Guanghai, Hu, Huaichuan, Hu, Qingsheng, Hu, Yanlan, Hu, Zhenhua, Huang, Juan, Huang, Liansheng, Huang, Ming, Huang, Ronglin, Ji, Xiang, Jia, Hua, Jiang, Caichao, Jie, Yinxian, Ju, Songqing, Kong, Defeng, Li, Erzhong, Li, Guoqiang, Li, Jiahong, Li, Junjun, Li, Miaohui, Li, Pan, Li, Kedong, Li, Shi, Li, Yadong, Liang, Lizhen, Liao, Yanchuan, Lin, Shiyao, Lin, Xin, Ling, Bili, Liu, Haiqing, Liu, Huajun, Liu, Jianwen, Liu, Liang, Liu, Shaocheng, Liu, Sheng, Liu, Wenbin, Liu, Xiaoju, Liu, Xiaoyan, Liu, Yong, Liu, Zhihong, Liu, Zhimin, Lu, Jianhua, Luo, Zhengping, Ma, Dengkui, Mao, Huafeng, and Ma, Wendong

Subjects
Nuclear and Plasma Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas, Nuclear and plasma physics
Abstract

Since the last IAEA-FEC in 2021, significant progress on the development of long pulse steady state scenario and its related key physics and technologies have been achieved, including the reproducible 403 s long-pulse steady-state H-mode plasma with pure radio frequency (RF) power heating. A thousand-second time scale (∼1056 s) fully non-inductive plasma with high injected energy up to 1.73 GJ has also been achieved. The EAST operational regime of high βP has been significantly extended (H98y2 > 1.3, βP ∼ 4.0, βN ∼ 2.4 and ne/nGW ∼ 1.0) using RF and neutral beam injection (NBI). The full edge localized mode suppression using the n = 4 resonant magnetic perturbations has been achieved in ITER-like standard type-I ELMy H-mode plasmas with q95 ≈ 3.1 on EAST, extrapolating favorably to the ITER baseline scenario. The sustained large ELM control and stable partial detachment have been achieved with Ne seeding. The underlying physics of plasma-beta effect for error field penetration, where toroidal effect dominates, is disclosed by comparing the results in cylindrical theory and MARS-Q simulation in EAST. Breakdown and plasma initiation at low toroidal electric fields (

Published
2024

33. Kinematics Analysis of Multi-link Mechanisms Under the Interaction of Motion Pair Clearance and Elastic Links

Author

Huang, Juan, Zhou, Dang, Wang, Hongbing, Yin, Lairong, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Rui, Xiaoting, editor, and Liu, Caishan, editor

Published
2024
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39. Feasibility of reducing scan time based on deep learning reconstruction in magnetic resonance imaging: a phantom study

Author

LÜ Xiaoyu, FENG Weiming, ZHOU Huiyun, LI Jiqiang, DONG Haipeng, HUANG Juan

Subjects
deep learning reconstruction, number of excitations, image quality, Medicine
Abstract

Objective To explore the feasibility of deep learning reconstruction (DLR) in shortening the scanning time through water phantom experiments. Methods The control variable method based on phantom, was adopted to depict the curves of scanning time varying with the number of excitation (NEX) ，matrix，and resolution. The signal-to-noise ratio (SNR) and subjective image quality of different DLR with high, medium and low noise reduction levels (DLR_H, DLR_M, DLR_L) and traditional reconstruction (ConR) were analyzed, including the four-point assessment of sharpness and detail clarity, and distortion degree, and the curves of changes were depicted and the fitting curves were calculated. Results The positive correlation between NEX and resolution with MRI scanning time and SNR was consistent in ConR and DLR reconstructions with different noise reduction levels. Specifically, under the same NEX and resolution conditions, the SNR of ConR, DLR_L, DLR_M, and DLR_H increased sequentially. When the matrix was fixed at 512×512 while images with subjective evaluation score of 3 or 4 were taken as satisfactory ones, the images reconstructed by DLR can obtain satisfactory sharpness, distortion degree and detail display, and when NEX were 3, 4, 5 and 7 and 11, image details were displayed best while scanning time was significantly reduced. Meanwhile, the distortion of images achieved satisfactory results with NEX of 2, 4, 5, and 6. Also, satisfactory detail display was obtained when NEX was 3, 5, 7 and 11. All the above combinations of NEX and resolution saved scanning time from 31 to 244 seconds. Similarly, as the resolution increased, the image scores of the sharpness and detail display gradually increased and. distortion degree decreased. When NEX was fixed at 6, the images reconstructed by DLR_H, DLR_M, DLR_L and ConR obtained satisfactory sharpness ；When the matrix was 320×320, 384×384, 448×448 and 640×640,, the scanning time was 141 seconds, 141 seconds, 187 seconds and 232 seconds, respectively. DLR_H and DLR_M achieved a smaller distortion degree at the 512×512 matrix, while DLR_L and ConR required a higher imaging matrix and longer scanning time to obtain similar image quality. For detail clarity, DLR_H achieved satisfactory detail display when the matrix was 512×512, and the scanning time was less than that of DLR_M, DLR_L and ConR. Conclusions DLR, especially DLR_H, while reducing NEX and resolution to shorten the MRI scanning time, may not only maintain a satisfactory SNR and image detail clarity, but also achieve higher image clarity and lower distortion degree.

Published
2024
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41. First Identification of New X-Ray Spectra of Mo39+, Mo40+, W43+, W44+ and W45+ on EAST

Author

Wang, Fudi, Lu, Dian, Gu, Mingfeng, Jin, Yifei, Fu, Jia, Shi, Yuejiang, Yang, Yang, Rice, J. E., Bitter, Manfred, Zang, Qing, Zhao, Hailin, He, Liang, Li, Miaohui, Xu, Handong, Liu, Haijing, Lin, Zichao, Chen, Yifei, Shen, Yongcai, Hill, Kenneth, Bae, Cheonho, Fu, Shengyu, Zhang, Hongming, Lee, Sanggon, Yang, Xiaoqing, Jia, Guozhang, Li, Yingying, Lyu, Bo, Huang, Juan, Gong, Xianzu, and Wan, Baonian

Subjects
Physics - Plasma Physics
Abstract

New high-resolution x-ray spectra of Mo39+, Mo40+, W43+, W44+ and W45+ have been carefully confirmed for the first time by use of the x-ray imaging crystal spectrometer (XCS) in Experimental Advanced Superconducting Tokamak (EAST) under various combined auxiliary heating plasmas conditions. Wavelength of these new x-ray spectra is ranged from 3.895 {\AA} to 3.986 {\AA}. When core electron temperature (Te0) reaches 6.0 keV, Mo39+ and Mo40+ lines of 3.9727, 3.9294 and 3.9480 {\AA} can be effectively detected on XCS for EAST; meanwhile, line-integrated brightness of these spectral lines of Mo39+ and Mo40+ is very considerable when electron temperature reaches 12.9 keV. Multi-components spectral lines for W43+, W44+ and W45+ have also been identified when Te0 reaches 6 keV. Parts of spectral lines, such as Zn-1, Cu-2, Cu-4a, Cu-4d and Cu-5 lines of tungsten, are first observed experimentally. When electron temperature reaches 12.9 keV, line-integrated intensity for part of these spectral lines of W43+, W44+ and W45+ are considerable. These experimental results and theoretical predictions from FAC and FLYCHK codes are in good general agreement. These new spectral lines, obtained on XCS for EAST, are vital for deeply uncovering the mechanisms of ion and electron thermal, high-Z impurity and momentum (anomalous) transport to achieve the advanced steady-state operation scenarios for ITER and CFETR.

Published
2022

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