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Zhao, K.J.,Nagashima, Y.,Li, F.M.,Shi, Yuejiang,Diamond, P.H.,Dong, J.Q.,Itoh, K.,Itoh, S.-I.,Zhuang, G.,Liu, H.,Chen, Z.P.,Cheng, J.,Nie, L.,Ding, Y.H.,Hu, Q.M.,Chen, Z.Y.,Rao, B.,Cheng, Z.F.,Gao, L. IOP 2017 Nuclear fusion Vol.57 No.12
<P>The temporal-spatial structures of plasma flows and turbulence around tearing mode islands are presented. The experiments were performed using Langmuir probe arrays in the edge plasmas of J-TEXT tokamak. The correlation analyses clearly show that the flows have similar structures of <I>m</I>/<I>n</I> = 3/1 as the magnetic island does (<I>m</I> and <I>n</I> are the poloidal and toroidal mode numbers, respectively). The sign of the potential fluctuations for the flows inverses and the powers significantly reduce at <I>q</I> = 3 surface. Approaching to the last closed flux surface for the magnetic islands, the radially elongated flow structure forms. The flows are concentrated near separatrix and show quadrupole structures. The turbulence is concentrated near X-point and partly trapped inside the magnetic islands.</P>
Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak
Yan, W,Chen, Z Y,Huang, D W,Hu, Q M,Shi, Y J,Ding, Y H,Cheng, Z F,Yang, Z J,Pan, X M,Lee, S G,Tong, R H,Wei, Y N,Dong, Y B IOP 2018 Plasma physics and controlled fusion Vol.60 No.3
<P>The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s<SUP>−1</SUP> in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.</P>
Tokamak plasma disruption precursor onset time study based on semi-supervised anomaly detection
X.K. Ai,W. Zheng,M. Zhang,D.L. Chen,C.S. Shen,B.H. Guo,B.J. Xiao,Y. Zhong,N.C. Wang,Z.J. Yang,Z.P. Chen,Z.Y. Chen,Y.H. Ding,Y. Pan Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.4
Plasma disruption in tokamak experiments is a challenging issue that causes damage to the device. Reliable prediction methods are needed, but the lack of full understanding of plasma disruption limits the effectiveness of physics-driven methods. Data-driven methods based on supervised learning are commonly used, and they rely on labelled training data. However, manual labelling of disruption precursors is a time-consuming and challenging task, as some precursors are difficult to accurately identify. The mainstream labelling methods assume that the precursor onset occurs at a fixed time before disruption, which leads to mislabeled samples and suboptimal prediction performance. In this paper, we present disruption prediction methods based on anomaly detection to address these issues, demonstrating good prediction performance on J-TEXT and EAST. By evaluating precursor onset times using different anomaly detection algorithms, it is found that labelling methods can be improved since the onset times of different shots are not necessarily the same. The study optimizes precursor labelling using the onset times inferred by the anomaly detection predictor and test the optimized labels on supervised learning disruption predictors. The results on J-TEXT and EAST show that the models trained on the optimized labels outperform those trained on fixed onset time labels.
Fam83h is Associated with Intracellular Vesicles and ADHCAI
Ding, Y.,Estrella, M.R.P.,Hu, Y.Y.,Chan, H.L.,Zhang, H.D.,Kim, J.-W.,Simmer, J.P.,Hu, J.C.-C. SAGE Publications 2009 Journal of dental research Vol.88 No.11
<P>Defects in <I>FAM83H</I> on human chromosome 8q24.3 cause autosomal-dominant hypocalcified amelogenesis imperfecta (ADHCAI). <I>FAM83H</I> does not encode a recognizable signal peptide, so we predicted that the Fam83h protein functions within the cell. We tested this hypothesis by constitutively expressing mouse Fam83h with green fluorescent protein (GFP) fused to its C-terminus in HEK293 and HeLa cell lines. Green fluorescent signal from the Fam83h-GFP fusion protein was associated with perinuclear vesicles, usually in the vicinity of the Golgi apparatus. No signal was observed within the nucleus. In addition, we identified <I> FAM83H</I> nonsense mutations in Hispanic (C1330C>T; p.Q444X) and Caucasian (c.1192C>T; p.Q398X) families with ADHCAI. We conclude that Fam83h localizes in the intracellular environment, is associated with vesicles, and plays an important role in dental enamel formation. <I>FAM83H</I> is the first gene involved in the etiology of amelogenesis imperfecta (AI) that does not encode a secreted protein.</P>
Xuan, X.T.,Ding, T.,Li, J.,Ahn, J.H.,Zhao, Y.,Chen, S.G.,Ye, X.Q.,Liu, D.H. Butterworths ; Taylor Francis ; Elsevier Science 2017 FOOD CONTROL Vol.71 No.-
<P>Time to detection experiments (TTD) based on turbidometry using an automatic Bioscreen C is a useful and straightforward method for estimating microbial growth parameters (lag time (lambda), growth rate (mu) and 'work to be done' (h(0))) at constant temperature. This study investigated the effects of slightly acidic electrolyzed water (SAEW) and heat treatment on Listeria monocytogenes growth at different recovery temperatures (10 degrees C, 15 degrees C, 25 degrees C, and 30 degrees C). Similar surviving and sublethally injured L. monocytogenes populations were obtained by heat treatment (55 degrees C for 10 min) and SAEW treatment (available chlorine concentration of 30 mg/l and ratio of bacteria against SAEW of 8:2 for 30 s). In these experimental conditions, stresses had greater impact on the lambda and h(0) parameter in comparison with recovery temperature while there was no great change in growth rate under isothermal conditions. Larger lambda values and h(0) parameters were observed in sublethal-heat injured L. monocytogenes (the maximum lambda and h(0) parameters are 30.199 h and 1.6492) as compared to SAEW groups (the maximum lambda and h(0) parameters are 22.634 h and 1.4396). The sensitivity analysis of SAEW and heat treatments on h(0) parameter indicated that SAEW treatment showed a higher influence. The collinearity diagnostics of independent variables [recovery temperature (T), mu, lambda] for dependent variable (h(0) parameter) demonstrated that T, mu and lambda had strong collinearity. In addition, the established secondary models in this study have good performances on predicting the effect of recovery temperature on bacterial growth parameters. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Interdecadal change in the lagged relationship between the Pacific–South American pattern and ENSO
Ding, R.,Li, J.,Tseng, Y. h.,Ha, K. J.,Zhao, S.,Lee, J. Y. Springer-International 2016 Climate dynamics Vol.47 No.9
<P>A significant interdecadal change in the lagged relationship between the austral summer Pacific-South American (PSA) pattern and the El Nio-Southern Oscillation (ENSO) in the following austral summer (the PSA serving as a precursor signature to ENSO events) has been detected by analysis of a 91-year historical record. Strong correlations between the PSA and ENSO occurred during the periods 1956-1975 and 1990-2004 [referred to as the high correlation (HC) periods], but the correlations were weak for the periods 1928-1956 and 1975-1990 [referred to as the low correlation (LC) periods]. Both the processes of surface air-sea coupling in the extratropical/tropical Pacific, and subsurface ocean temperature evolution along the equator associated with the PSA, were found to be stronger during the HC periods than during the LC periods, thereby resulting in a stronger influence of the PSA on the subsequent ENSO during the HC periods. Changes in the PSA-ENSO relationship can be attributed mainly to interdecadal changes in the intensity of the austral summer PSA. The latter was found to have contributions from both the modulation of the Pacific decadal oscillation and long-term variations in the Southern Annular Mode.</P>
Structural damage detection based on Chaotic Artificial Bee Colony algorithm
H.J. Xu,Z.H. Ding,Z.R. Lu,J.K. Liu 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.6
A method for structural damage identification based on Chaotic Artificial Bee Colony (CABC) algorithm is presented. ABC is a heuristic algorithm with simple structure, ease of implementation, good robustness but with slow convergence rate. To overcome the shortcoming, the tournament selection mechanism is chosen instead of the roulette mechanism and chaotic search mechanism is also introduced. Residuals of natural frequencies and modal assurance criteria (MAC) are used to establish the objective function, ABC and CABC are utilized to solve the optimization problem. Two numerical examples are studied to investigate the efficiency and correctness of the proposed method. The simulation results show that the CABC algorithm can identify the local damage better compared with ABC and other evolutionary algorithms, even with noise corruption.