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The adjoint-based Two Oceans One Sea State Estimate(TOOSSE)

Journal of Oceanology and Limnology 2022年第1期40卷 1-21页

作者： Xiaowei WANG Chuanyu LIU armin k.hl Wu GENG Fan WANG Detlef STAMMER CAS key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Institut für Meereskunde Universität HamburgHamburg D20146Germany State key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

An eddy-resolving four-dimensional variational(adjoint)data assimilation and state estimate was constructed for the low-to mid-latitude Pacifi c,Indian Oceans,and South China Sea based on the framework of“Estimating the Circulation and Climate of the Oceans(ECCO)”.It is named as the Two Oceans One Sea State Estimate(TOOSSE).It fi ts a model to a number of modern observations of 2015-2016,including the Argo fl oat temperature and salinity,satellite altimetric sea surface anomalies,by adjusting initial temperature and salinity,sea surface boundary conditions,and background diapycnal diff *** total,~50%of the original model-data misfi ts have been eliminated,and the estimated state agreed well with a variety of independent observations at meso-to large scales,and on the intra-seasonal to interannual *** variability is systematically strengthened in TOOSSE and closer to observations than that without data assimilation,which is especially evidenced by the improved simulation of the mesoscale tropical instability waves(TIWs).Adjustments to ocean surface forcing parameters exhibit both large and frontal/mesoscale structures,and the magnitude reach 20%-100%of the fi rst guesses;the adjustments to diapycnal diff usivity exhibit an obvious elevation(decrement)in(below)the thermocline in the equatorial *** results indicate that TOOSSE represents a dynamically and thermodynamically consistent ocean state estimate of the 2015-2016 Indo-Pacifi c Ocean,and can be widely utilized for regional process studies.

关键词： Pacifi c Ocean Indian Ocean South China Sea adjoint four-dimensional variational data assimilation

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China’s hl-3 tokamak achieves H-mode operation with 1 MA plasma current

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The Innovation 2024年第4期5卷 5-6页

作者： Wulyu Zhong hl-team Southwestern Institute of Physics Chengdu 610225China

In a remarkable achievement,China’s new-generation magnetic confinement fusion device,the hl-3 tokamak(formerly known as hl-2M),achieved highconfinement mode(H-mode)operation with a plasma current of 1 mega amperes(MA)for the first time on August 25th,*** breakthrough signifies a noteworthy milestone in China’s controlled nuclear fusion research,bringing us one step closer to the burning plasma phase.

关键词： tokamak mode bringing

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Characterization of plasma current quench during disruptions at hl-2A

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Plasma Science and Technology 2017年第5期19卷 1-5页

作者：竹锦霞张轶泼董云波 hl-2A Team School of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou 635000People'sRepublic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China 不详

The most essential assumptions of physics for the evaluation of electromagnetic forces on the plasma-facing components due to a disruption-induced eddy current are characteristics of plasma current quenches including the current quench rate or its waveforms. The characteristics of plasma current quenches at hl-2A have been analyzed during spontaneous disruptions. Both linear decay and exponential decay are found in the disruptions with the fastest current ***, there are two stages of current quench in the slow current quench case. The first stage with an exponential decay and the second stage followed by a rapid linear decay. The faster current quench rate corresponds to the faster movement of plasma displacement. The parameter regimes on the current quench time and the current quench rates have been obtained from disruption statistics at hl-2A. There exists no remarkable difference for distributions obtained between the limiter and the divertor configuration. This data from hl-2A provides basic data of the derivation of design criteria for a large-sized machine during the current decay phase of the disruptions.

关键词： tokamak disruption current quench

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Study of nonlinear mode–mode couplings between Alfvénic modes by the Fourier bicoherence and Lissajous-curve technique in hl-2A

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Plasma Science and Technology 2019年第7期21卷 97-105页

作者： Yumei HOU Wei CHEN Yi YU Xuru DUAN Min XU Minyou YE hl-2A Team School of Physical Sciences University of Science and Technology of ChinaHefei 230026People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Nonlinear couplings of various Alfvén modes driven by energetic particles in hl-2 A are addressed by employing the Fourier bicoherence and Lissajous-curve technique. Long-lived modes and high-frequency coherent modes are presented. Then the squared bicoherence of three waves establishes the existence of three-wave coupling. Lissajous-curves of those waves manifest that their phases are locked, which again confirms that they are nonlinearly coupled to each other. Moreover, coupled modes triggered by supersonic molecular beam injection are investigated. The phase evolution of them is given by the Lissajous-curve. Further details of phase-flip and phase-slip are presented and discussed.

关键词： nonlinear mode-mode coupling Alfvén modes Fourier bicoherence Lissajous-curve

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PERIODIC CARDINAL INTERPOLATORY WAVELETS

引用

Chinese Annals of Mathematics,Series B 1998年第2期19卷 133-142页

作者： Chen, hl Xiao, SL Acad Sinica Inst Math Beijing 100080 Peoples R China

The authors construct periodic interpolating wavelets and their duals from a periodic function g(x) whose Fourier coefficients are positive. The corresponding decomposition. and reconstruction algorithm is also given. The spline example shows that such kind of wavelets shares good localization with any desired regularity and symmetry. The construction depends essentially on the finite Fourier Transformation and the theory of circulant matrix.

关键词： Periodic wavelet Multiresolution Cardinal Interpolation Dual basis Circulant matrix

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Influence of amphiphilic structures on the stability of polyphenols with different hydrophobicity

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Science China Chemistry 2007年第1期50卷 121-126页

作者： Bergensthl BJRN Food Technology Center for Chemistry and Chemical EngineeringLund UniversityPO Box 124S-22100LundSweden

Autooxidation of five polyphenols representing range of different hydrophobicities(catechin gallate (CG),(-)catechin((-)C),epicatechin(EC),epigallocatechin gallate(EGCG)and epigallocatechin(EGC)) in three different aqueous solutions:molecular solution,micellar solution(Tween-20)and liposomal dispersion(soybean lecithin)was monitored by *** rate of oxidation of the five polyphenols was higher at pH 4.5 than at pH *** with the control,addition of Tween-20(micellar structure)and lecithin(liposomal structure)significantly decreased the degradation of *** the presence of lecithin the autooxidation of all the five polyphenols was slower than in the presence of Tween-20. The effective protection of the colloidal structures was compared with the hydrophobicity of the poly- phenols estimated from the partitioning between octanol and *** protection from oxidation in the presence of the colloidal structures(micellar or liposomal)increased with increasing partitioning of a polyphenol towards the hydrophobic *** protecting effect of the colloidal structures was more effective at pH 4.5 than at pH 3.5.

关键词： amphiphilic structures autooxidation polyphenols k value effective protection

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In　Situ　Confocal　Microprobe　Raman　Spectroscopy　Study　of　the　Oxygen　Species　over　Cerium　Oxide

引用

Chinese Chemical Letters 1996年第10期7卷 965-966页

作者： Long, RQ Wan, hl XIAMEN UNIV DEPT CHEMXIAMEN 361005PEOPLES R CHINA XIAMEN UNIV STATE KEY LAB PHYS CHEM SOLID SURFACEXIAMEN 361005PEOPLES R CHINA

In situ confocal microprobe Raman spectroscopy results showed that O22-, O2- and O2δ- (0 < δ< 1) adspecies formed on the O2 pretreated cerium oxide sample when the temperature was below 423 k. At 1023 k, only CeO2 F... 详细信息

In situ confocal microprobe Raman spectroscopy results showed that O22-, O2- and O2δ- (0 k. At 1023 k, only CeO2 F2g peak (at 449 cm-1) and O2- species (at 1159 cm-1) were observed on the surface. The reactivity of methane with the oxygen species was lower than that of ethane with the oxygen species.

关键词： over Cerium Confocal Microprobe Oxide Oxygen Raman Situ Species

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Application of the Magnetic Surface Based PARk-Matrix Method in the HCOOH Laser Interferometry System on hl-2A

引用

Plasma Science and Technology 2016年第12期18卷 1198-1203页

作者：李永高周艳袁保山邓中朝张博宇李远邓玮王浩西易江 hl-2A Team Southwestern Institute of Physics Chengdu 610041 China

A new electron density profile reconstruction procedure based on the PARk-matrix method has been firstly exploited for the multi-chord formic acid（HCOOH, λ=432.5 μm） laser interferometry system on the hl-2A tokamak. According to the geometric coordinates of the magnetic surfaces reconstructed by the CF（current fitting） code and the assumption that the electron density between two adjacent magnetic surfaces is a constant, the local electron density is calculated layer by layer, and the electron density profile n_e（Z） can be determined, as well as the density profile n_e（R）. The simulation result indicates that the error of the PARk-matrix method is acceptable for the four-chord HCOOH laser interferometer. In the applications, it shows that the reconstructed electron density profile agrees well with the microwave reflectometry measurement,and the sawtooth reversion radius is consistent with that deduced from the soft X-ray ***, the electron density profiles with electron cyclotron resonance heating（ECRH） and supersonic molecular beam injection（SMBI） are also reconstructed and analyzed.

关键词： electron density profile interferometer PARk-matrix method hl-2A

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Dynamic Behaviour of a Caisson Quaywall Under Strong Earthquake

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China Ocean Engineering 1999年第1期14卷 47-62页

作者： Liu, hl Dai, HC Iai, S Hohai Univ Geotech Engn Res Inst Nanjing 210098 Peoples R China China Yangtze Three Gorges Project Dev Corp Yichang 443002 Peoples R China Minist Transport Port & Harbour Res Inst Nagase 239 Japan

Effective stress analysis is performed to evaluate the residual displacement of a caisson quaywall during 1994 Hokkaido- Toho- Oki Earthquake and 1993 kushiro- Oki Earthquake. The constitutive model used in this study is a multiple shear mechanism type defined in strain space and can take into account the effect of rotation of principal stress axis. The earthquake accelerations recorded at the outcropping rock during the earthquake are used as input bedrock motion. The results of finite element analysis are in good agreement with the observed behaviour of the quaywall. The analysis also indicates that liquefaction and high excess porewater pressure have a significant effect on the deformation of the caisson. Soil improvement is speculated as the most reliable measures against liquefaction. The influence of soil improvement and the reasonable improved area are discussed in the paper.

关键词： caisson quaywall effective stress analysis lique faction residual deformation

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Stochastic simulation of chemical chaos

引用

Chinese Science Bulletin 1997年第1期42卷 47-50页

作者： Wang, hl Xin, HW UNIV SCI & TECHNOL CHINA DEPT CHEM PHYSHEFEI 230026PEOPLES R CHINA

A chemical reaction is often described by a set of ordinary differential equations based on the mass action law of chemical kinetics. From the microscopic point of view, these macroscopic rate equations originated in the microscopic elastic and reactive collision processes, and a full description of a chemical reaction includes the mean molecular numbers (or concentrations) of reacting species and the fluctuations around these mean values. In normal cases, concentra-

关键词： chaos stochastic simulation nonequilibrium.

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