Variations of sea surface height （SSH） in the Kuroshio south of Japan are addressed by analyzing 19-year （1993-2011） altimetry data from AVISO. Regionally averaged time series of observed SSH had a rising linear t...Variations of sea surface height （SSH） in the Kuroshio south of Japan are addressed by analyzing 19-year （1993-2011） altimetry data from AVISO. Regionally averaged time series of observed SSH had a rising linear trend at 2.64＋0.72 mrn/a in this period. By analyzing the power spectra, several periods were recognized in temporal SSH variations, including those around 90 and 360 days. The seasonal cycle of SSH was minimum in winter （February） and maximum in summer （August）, with peak-to-peak amplitude about 20.0 cm. The spatial distribution of linear trends was inhomogeneous, with a rising linear trend along the coastline and a tripole structure offshore. Spatial distributions of standard deviation of seasonal SSH show very dynamic activities in the southeast of Kyushu and south of Honshu. Seasonal variations of observed SSH are partially explained by surface buoyancy forcing, local wind forcing and the steric component related to subsurface water beneath the mixed layer. Results show different spatial distributions of correlation coefficient and estimation skill between seasonally observed and modeled SSH, which are calculated from surface buoyancy flux, local wind forcing and the steric component related to subsurface water. Of those three, the surface buoyancy flux has a greater contribution to variations of observed SSH on the seasonal time scale south of Japan.展开更多
We report on the localized spatial soliton excitations in the multidimensional nonlinear Schrodinger equation with radially variable nonlinearity coefficient and an external potential. By using Hirota＇s binary differ...We report on the localized spatial soliton excitations in the multidimensional nonlinear Schrodinger equation with radially variable nonlinearity coefficient and an external potential. By using Hirota＇s binary differential operators, we determine a variety of external potentials and nonlinearity coefficients that can support nonlinear localized solutions of different but desired forms. For some specific external potentials and nonlinearity coefficients, we discuss features of the corresponding （2＋1）-dimensional multisolitonic solutions, including ring solitons, lump solitons, and soliton clusters.展开更多
Rapidly urbanizing China is at a critical period in the construction of urban meaning and order. The city as an organic compound of space represents the organic integration in space of the elements of civilization, wh...Rapidly urbanizing China is at a critical period in the construction of urban meaning and order. The city as an organic compound of space represents the organic integration in space of the elements of civilization, while its meaning provides the ethical ties that link these elements to form an organic whole. A city without a locus of meaning will be buffeted by risks and confrontations. The realization of sustainable urban prosperity requires the integration of the city as an ordered community of meaning at the same time as its physical forms take shape. An important practical path to achieving this aim is restructuring city space in a rational ＂spatial-ethical ecology＂ based on integrity and interaction of physical, social and psychological urban space, by means of collective action knitted together by meaning and carried out by communities and organizations.展开更多
A new nonparametric procedure is developed to test the exponentiality against the strict NBUC property of a life distribution. The exact null distribution is derived by the theory of sample spacings, and the asymptoti...A new nonparametric procedure is developed to test the exponentiality against the strict NBUC property of a life distribution. The exact null distribution is derived by the theory of sample spacings, and the asymptotic normality is also established by the large sample theory of L-statistics. Finally, the lower and upper tailed probability of the exact null distribution and some numerical simulation results are presented as well.展开更多
基金Supported by the National Natural Science Foundation of China(No.41230420)the Basic Research Program of Science and Technology Projects of Qingdao(No.11-1-4-95-jch)the Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX2-EW-201)
文摘Variations of sea surface height （SSH） in the Kuroshio south of Japan are addressed by analyzing 19-year （1993-2011） altimetry data from AVISO. Regionally averaged time series of observed SSH had a rising linear trend at 2.64＋0.72 mrn/a in this period. By analyzing the power spectra, several periods were recognized in temporal SSH variations, including those around 90 and 360 days. The seasonal cycle of SSH was minimum in winter （February） and maximum in summer （August）, with peak-to-peak amplitude about 20.0 cm. The spatial distribution of linear trends was inhomogeneous, with a rising linear trend along the coastline and a tripole structure offshore. Spatial distributions of standard deviation of seasonal SSH show very dynamic activities in the southeast of Kyushu and south of Honshu. Seasonal variations of observed SSH are partially explained by surface buoyancy forcing, local wind forcing and the steric component related to subsurface water beneath the mixed layer. Results show different spatial distributions of correlation coefficient and estimation skill between seasonally observed and modeled SSH, which are calculated from surface buoyancy flux, local wind forcing and the steric component related to subsurface water. Of those three, the surface buoyancy flux has a greater contribution to variations of observed SSH on the seasonal time scale south of Japan.
基金Supported by the Natural Science Foundation of Guangdong Province under Grant No. 1015283001000000,Chinasupported by the NPRP 09-462-1-074 project with the Qatar National Research Foundation
文摘We report on the localized spatial soliton excitations in the multidimensional nonlinear Schrodinger equation with radially variable nonlinearity coefficient and an external potential. By using Hirota＇s binary differential operators, we determine a variety of external potentials and nonlinearity coefficients that can support nonlinear localized solutions of different but desired forms. For some specific external potentials and nonlinearity coefficients, we discuss features of the corresponding （2＋1）-dimensional multisolitonic solutions, including ring solitons, lump solitons, and soliton clusters.
基金Partially supported by NNSFC(11671214,11971348,12071230)National College Students Innovation and Entrepreneurship Training Program(202210055048)+1 种基金Hundred Young Academia Leaders Program of Nankai University(63223027,91923104,91823003,63174012,ZB22000105)Functional Analysis Teaching Funds of Nankai University(NKJG2022053)。
基金This study is part of 2007 key project sponsored by the National Social Science Foundation, ＂Paradigm Transformation of Development Ethics and the Historical Construction of ‘Harmonious World＇＂ （07AZX005）.
文摘Rapidly urbanizing China is at a critical period in the construction of urban meaning and order. The city as an organic compound of space represents the organic integration in space of the elements of civilization, while its meaning provides the ethical ties that link these elements to form an organic whole. A city without a locus of meaning will be buffeted by risks and confrontations. The realization of sustainable urban prosperity requires the integration of the city as an ordered community of meaning at the same time as its physical forms take shape. An important practical path to achieving this aim is restructuring city space in a rational ＂spatial-ethical ecology＂ based on integrity and interaction of physical, social and psychological urban space, by means of collective action knitted together by meaning and carried out by communities and organizations.
基金This research is supported by the National Natural Science Foundation of Chinaunder Grant No. 10201010 and TY 10126014.
文摘A new nonparametric procedure is developed to test the exponentiality against the strict NBUC property of a life distribution. The exact null distribution is derived by the theory of sample spacings, and the asymptotic normality is also established by the large sample theory of L-statistics. Finally, the lower and upper tailed probability of the exact null distribution and some numerical simulation results are presented as well.
