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EXISTENCE OF AREA MINIMIZING TANGENT CONES OF INTEGRAL CURRENTS WITH PRESCRIBED MEAN CURVATURE
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作者 Frank Duzaar(Institut fur Augewandte Mathematik der Universitat Bonn,Beringstr.4.D-53115 Bonn)Martin Fuchs(Universitat des Saarlandes,Fachbereich Mathematik,D-66123 Saarbrucken) 《Acta Mathematica Scientia》 SCIE CSCD 1995年第1期95-102,共8页
Given an integral M-currrent To in Rm+k and a tensor H of type(m.l)on Rn+k with values orthogonal to each of its arguments we proved in a previous peper[3]the sxistence of anintegral m-current T =γ(M,θ.ζ)with bound... Given an integral M-currrent To in Rm+k and a tensor H of type(m.l)on Rn+k with values orthogonal to each of its arguments we proved in a previous peper[3]the sxistence of anintegral m-current T =γ(M,θ.ζ)with boundary T0 and mean curvature vector H by minimizing an appropriate functional on suitable subclasses of the set of all integral currents.In thes paperwe discuss the existence and structure of oriented tangent cones C of T at points x∈spt(T) spt(T),especially we show that C is locally mass minimizing. 展开更多
关键词 integral currents generalized mean curvature tangent cones
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Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary
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作者 Zhigao Chen Ya Ban +2 位作者 Xiaoye Chen Dajun Li Shengping Wang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第2期44-55,共12页
Three long-term fixed acoustic Doppler current profilers were first used for investigating the vertical structure of tidal currents in Xuliujing Section of Changjiang River Estuary.Moreover,three different periods(spr... Three long-term fixed acoustic Doppler current profilers were first used for investigating the vertical structure of tidal currents in Xuliujing Section of Changjiang River Estuary.Moreover,three different periods(spring,summer and fall)were also considered for investigating seasonal variations.The semi-diurnal tides were the most energetic,with along-channel speed of up to 80 cm/s for M_(2)constituent,which dominates at all stations with percent energy up to 65%–75%during seasons.The shape of tidal ellipses of the most energetic semi-diurnal constituent M_(2)showed obvious polarization of the flow paralleling to the riverbank,with the minor semi-axis being generally less than 20%of the major one.The maximum velocity of mean current is appeared in top layers at all the three stations,and the velocity decreased with the depth.The seasonal variations of direction are also observed,which is probably caused by complex local topography since the erosion and deposition in riverbed.Observed vertical variation of four parameters of M_(2)ellipses,agreed well with the optimally fit frictional solutions in top and middle layers.However,there was an obvious difference between frictional model and observed data in the lower water column.Discrepancies are probably on account of stratification,which strengthens in summer and fall due to the freshening influence of the Changjiang River Estuary outflow. 展开更多
关键词 vertical structure seasonal variations tidal current mean current acoustic Doppler current profiler Changjiang River Estuary
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The fundamental characteristics of current in the Bering Strait and the Chukchi Sea from July to September 2003 被引量:7
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作者 LI Lei DU Ling +2 位作者 ZHAO Jinping ZUO Juncheng LI Peiliang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2005年第6期1-11,共11页
The characteristics of current in the Bering Strait and the Chukchi Sea areanalyzed based on the two current data on the mooring stations during the Second National ArcticResearch Expedition of China in 2003. The tida... The characteristics of current in the Bering Strait and the Chukchi Sea areanalyzed based on the two current data on the mooring stations during the Second National ArcticResearch Expedition of China in 2003. The tidal currents of the principal diurnal and semidiurnalellipses rotate clockwise in the upper layer, except for N_2, S_2, and Q_1 at Sta. ST. In the BeringStrait (Sta. ST), the major semi-axis of tidal current constituent M_2 is 2.9 cm/s in the upperlayer, which is much smaller than that of semi-monthly oscillation (11.8 cm/s); and the mean currentflows northwestward at the amplitude of about 20 cm/s and varies a little with depth. During thecruise, the current has significant semi-monthly oscillation at the two mooring stations. Thespectra analyses of the air pressure gradient and the wind stress show that there are thesemi-monthly oscillations in these two data series. The near-inertial current, approximately 4 cm/s,presents almost the same magnitude of the principal tidal currents in the Bering Strait. 展开更多
关键词 tidal current mean current semi-monthly oscillation near-inertial current bering strait and chukchi sea
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Comparative simulation study of effects of eddy-topography interaction in the East/Japan Sea deep circulation
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作者 CHOI Youngjin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2015年第7期1-18,共18页
In this study the structure and seasonal variations of deep mean circulation in the East/lapan Sea (E/S) were numerically simulated using a mid-resolution ocean general circulation model with two different parameter... In this study the structure and seasonal variations of deep mean circulation in the East/lapan Sea (E/S) were numerically simulated using a mid-resolution ocean general circulation model with two different parameterizations for the eddy-topography interaction (ETI). The strong deep mean circulations observed in the EIS are well reproduced when using the ETI parameterizations. The seasonal variability in the EIS deep layer is shown by using ETI parameterization based on the potential vorticity approach, while it is not shown in the statistical dynamical parameterization. The driving mechanism of the strong deep mean currents in the E/S are discussed by investigating the effects of model grids and parameterizations. The deep mean circulation is more closely related to the baroclinic process and potential vorticity than it is to the wind driven circulation. 展开更多
关键词 East/Iapan Sea deep mean current seasonal variability ocean general circulation model eddy- topography interaction
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CURRENT MEANS IN THE DIAGNOSIS AND TREATMENT OF ORAL AND MAXILLOFACIAL TUMORS IN CHINA
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作者 邱蔚六 《Chinese Medical Journal》 SCIE CAS CSCD 1995年第3期13-14,共2页
Oral and maxillofacial tumors (OMT) constitute a great number in tumors of head and neck as a whole. The incidence of OMT in China is rather low. but. owing to our big population, the absolute number of the patients i... Oral and maxillofacial tumors (OMT) constitute a great number in tumors of head and neck as a whole. The incidence of OMT in China is rather low. but. owing to our big population, the absolute number of the patients is high. The diagnosis and treatment of OMT in China with special emphasis on malignancies are briefly introduced below. 展开更多
关键词 ORAL 110 CURRENT meanS IN THE DIAGNOSIS AND TREATMENT OF ORAL AND MAXILLOFACIAL TUMORS IN CHINA OMT
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