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Gong, D. Y.,Guo, D.,Gao, Y.,Yang, J.,Mao, R.,Qu, J.,Gao, M.,Li, S.,Kim, S. J. Springer Science + Business Media 2017 Climate dynamics Vol.48 No.7
<P>The inter-annual relationship between the boreal winter Arctic Oscillation (AO) and summer sea surface temperature (SST) over the western tropical Indian Ocean (TIO) for the period from 1979 to 2015 is investigated. The results show that the January-February-March AO is significantly correlated with the June-July-August SST and SST tendency. When both El Nio/Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) variance are excluded, the winter AO is significantly correlated with the regional mean SST of the western TIO (40-E and S-N), . The multi-month SST tendency, i.e., the SST difference of June-July-August minus April-May, is correlated with the winter AO at . Composite analysis indicates similar warming over the western TIO. Two statistical models are established to predict the subsequent summer's SST and SST tendency. The models use the winter AO, the winter ENSO and the autumn-winter IOD indexes as predictors and explain 65 and 62 % of the variance of the subsequent summer's SST and SST tendency, respectively. Investigation of the regional air-sea fluxes and oceanic dynamics reveals that the net surface heat flux cannot account for the warming, whereas the oceanic Rossby wave plays a predominant role. During positive AO winters, the enhanced Arabian High causes stronger northern winds in the northern Indian Ocean and leads to anomalous cross-equatorial air-flow. The Ekman pumping in association with the anomalous wind stress curl in the central TIO generates a significantly deeper thermocline and above-normal sea surface height at 60-75E and 5-S. The winter AO-forced Rossby wave propagates westward and arrives at the western coast in summer, resulting in the significant SST increase. Forced by the observed winter AO-related wind stress anomalies over the Indian Ocean, the ocean model reasonably reproduces the Rossby wave as well as the resulting surface ocean warming over the western TIO in the subsequent summer. Observational analysis and numerical experiments suggest the importance of the oceanic dynamics in connecting the winter AO and summer SST anomalies.</P>
China Spallation Neutron Source: Accelerator Design Iterations and R&D Status
J. Wei,C.-D. Deng,C.-H. Wang,C.-T. Shi,H. Sun,H.-F. Ouyang,H.-M. Qu,H.-Y. Dong,J. Li,J. Zhang,J.-S. Cao,J.-Y. Tang,L. Dong,L.-L. Wang,Q. Qin,Q.-B. Wang,S. Wang,S.-N. Fu,S.-X Fang,T. -G. Xu,W. Kang,Y.- 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H$^-$ ion source, an H$^-$ linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.
Blast response of cracked reinforced concrete slabs repaired with CFRP composite patch
X. Q Kong,Q. Zhao,Y. D. Qu,W. J. Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
In the present study, a numerical model is developed for investigating the capacity of the Carbon Fiber Reinforced Polymer(CFRP) patch to improve the blast response of cracked reinforced concrete (RC) slab. The model uses a finite element methodadopted by LS-DYNA. To achieve this aim, a 3D nonlinear Finite-element (FE) model is developed to study the blast resistance ofcracked RC slab with and without external reinforcement by CFRP. After model validation, the blast response of the cracked RCslabs with several different crack parameters (e.g. orientation, width and depth) under the blast loading is firstly studied. Then toimprove the blast resistance, the cracked RC slabs are stiffened by CFRP composite patches. Numerical results show that the repairedpatches can significantly reduce the mid-span deflection and improve the damage distribution of the cracked RC slab. The CFRP isproved to be a valid solution for repairing of cracked RC slab and can increase the blast resistance of RC structures under blastloading. Finally, a parametric analysis is further conducted to investigate the influences of the layer number and layer size of theCFRP patch on the blast resistance of the retrofitted model.