单节拍浮点运算神经元的组合逻辑设计

介绍了通用神经计算机CASSANDRA-Ⅱ中单节拍浮点运算神经元的硬件设计方法.基于通用超曲面神经元模型,以组合电路与EPROM查表分别实现浮点数加法、乘法及p次幂运算,从而实现了单节拍内完成浮点运算|W(X-Y)|p的神经元组合逻辑设计.该设计使通用神经计算机硬件具有更强的适应能力和更好的网络性能.

Comparison of aggregation behaviors between branched and linear block polyethers: MesoDyn simulation study

The comparison of aggregation behaviors between the branched block polyether T1107 (polyether A) and linear polyether (EO)(60)(PO)(40)(EO)(60) (polyether B) in aqueous solution are investigated by the MesoDyn simulation. Polyether A forms micelles at lower concentration and has a smaller aggregation number than B. Both the polyethers show the time-dependent micellar growth behaviors. The spherical micelles appear and then change to rod-like micelles with time evolution in the 10 vol% solution of polyether A. The micellar cluster appears and changes to pseudo-spherical micelles with time evolution in the 20 vol% solution of polyether A. However, the spherical micelles appear and change to micellar cluster with time evolution in the 20 vol% polyether B solution. The shear can induce the micellar transition of both block polyethers. When the shear rate is 1x10(5) s(-1), the shear can induce the sphere-to-rod transition of both polyethers at the concentration of 10 and 20 vol%. When the shear rate is lower than 1x10(5) s(-1), the huge micelles and micellar clusters can be formed in the 10 and 20 vol% polyether A systems under the shear, while the huge micelles are formed and then disaggregated with the time evolution in the 20 vol% polyether B system.

长白山地区蒙古栎光合特性

基于单叶尺度上的光强-光合响应以及CO2-光合响应测定,对长白山地区蒙古栎成树和幼树的光合特性分别进行了研究.结果表明,蒙古栎成树的光补偿点Lcp为21μmol/(m2·s),光饱和点Lsp为1564μmol/(m2·s),表观量子效率α为0·045;幼树的Lcp、Lsp、α以及CO2补偿点、饱和点分别为29μmol/(m2·s)、1581μmol/(m2·s)、0·049、73μmol/mol、625μmol/mol.幼树和成树具有相似的光响应特征,但前者的光合同化能力要高于后者.蒙古栎具有典型的喜光性,但对高光的利用效率要低于弱光.