Based on the samples collected mesoplankton net from the south part Of Taiwan Strait (22. 25 --24. 65N, 117. 50 -- 120. 00E) in August 1997, 292 species of zooplankton and 11 groups of meroplankton were identified. In...Based on the samples collected mesoplankton net from the south part Of Taiwan Strait (22. 25 --24. 65N, 117. 50 -- 120. 00E) in August 1997, 292 species of zooplankton and 11 groups of meroplankton were identified. In the survey waters, Copepoda was dominant in either species or individual numbers. The diversity (H' ) was 5. 11 and the ratio of diversity to evenness (J ) was 7. 10, showing that the diversity of zooplankton was exceedingly high in the survey waters. Three zooplankton communities were clearly divided by systematical cluster analysis, indicating that the biotopes of these zooplankton communities may serve as the evidence for the basic status of distribution of water masses during the investigation.展开更多
A model for electrons confined in narrow conducting channels in the presense of a magnetic field is presented which takes into account a cut-off in the filling of the subbands.Such a cut-off gives rise to energy separ...A model for electrons confined in narrow conducting channels in the presense of a magnetic field is presented which takes into account a cut-off in the filling of the subbands.Such a cut-off gives rise to energy separated subbands resulting in a relation between sublevel index n and inverse magnetic field B^(-1) such that in the high field regime it envolves into an original form as in a 2D case and in the moderate field regime it shows pronounced deviation horn linearity.展开更多
基金the National Natural Science Foundation of China under contract! No. 49636220.
文摘Based on the samples collected mesoplankton net from the south part Of Taiwan Strait (22. 25 --24. 65N, 117. 50 -- 120. 00E) in August 1997, 292 species of zooplankton and 11 groups of meroplankton were identified. In the survey waters, Copepoda was dominant in either species or individual numbers. The diversity (H' ) was 5. 11 and the ratio of diversity to evenness (J ) was 7. 10, showing that the diversity of zooplankton was exceedingly high in the survey waters. Three zooplankton communities were clearly divided by systematical cluster analysis, indicating that the biotopes of these zooplankton communities may serve as the evidence for the basic status of distribution of water masses during the investigation.
文摘A model for electrons confined in narrow conducting channels in the presense of a magnetic field is presented which takes into account a cut-off in the filling of the subbands.Such a cut-off gives rise to energy separated subbands resulting in a relation between sublevel index n and inverse magnetic field B^(-1) such that in the high field regime it envolves into an original form as in a 2D case and in the moderate field regime it shows pronounced deviation horn linearity.
