The authors studied effect of cerium and lanthanum on crystallization parameters anti structure formation of cast iron.It was found that REM additives increased duration and temperature range of eutectic transforma- t...The authors studied effect of cerium and lanthanum on crystallization parameters anti structure formation of cast iron.It was found that REM additives increased duration and temperature range of eutectic transforma- tion and prevented primary graphite precipitation.The change in crystallization pattern of iron is due to the REM effect on graphite nucleation and growth.On the basis of microprobe analysis of REM distribution and the DTA results,a mechanism of the REM effect on iron crystallization and graphite morphology was suggested.展开更多
The off-plane propagation of electromagnetic (EM) waves in a two-dimensional (2D) graphite photonic crystal structure was studied using transfer matrix method. Transmission spectra calculations indicate that such a 2D...The off-plane propagation of electromagnetic (EM) waves in a two-dimensional (2D) graphite photonic crystal structure was studied using transfer matrix method. Transmission spectra calculations indicate that such a 2D structure has a common band gap from 0.202 to 0.2035 c/a for both H and E polarizations and for all off-plane angles form 0° up to 90°. The presence of such an absolute band gap implies that 2D graphite photonic crystal, which is much easier and more feasible to fabricate, can exhibit some properties of a three-dimensional (3D) photonic crystal.展开更多
文摘The authors studied effect of cerium and lanthanum on crystallization parameters anti structure formation of cast iron.It was found that REM additives increased duration and temperature range of eutectic transforma- tion and prevented primary graphite precipitation.The change in crystallization pattern of iron is due to the REM effect on graphite nucleation and growth.On the basis of microprobe analysis of REM distribution and the DTA results,a mechanism of the REM effect on iron crystallization and graphite morphology was suggested.
基金This work was supported by the National Natural Science Foundation under Grant No. 10274078. Y. Li is the author to whom the correspondence should be addressed,
文摘The off-plane propagation of electromagnetic (EM) waves in a two-dimensional (2D) graphite photonic crystal structure was studied using transfer matrix method. Transmission spectra calculations indicate that such a 2D structure has a common band gap from 0.202 to 0.2035 c/a for both H and E polarizations and for all off-plane angles form 0° up to 90°. The presence of such an absolute band gap implies that 2D graphite photonic crystal, which is much easier and more feasible to fabricate, can exhibit some properties of a three-dimensional (3D) photonic crystal.
