<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>Dear Everyone:</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I have done many simulations. But I found when I add direct electric field along x(y or z) axis for a 100ps~2ns simulation with strength 0.0003V/nm~3V/nm, the dielectric constant&nbsp; become bigger than 0V/nm. I have set the <strong>epsilon-r =0.&nbsp;&nbsp; I want to know why? I beg your pardon? Even I use the example in <a href="http://www.baidu.com/link?url=AqAoJrMvTNF8TEDLInoLj2ySsz4cr0g4ee6kHbHD6H5EwQnlSAJXyHvcdZHUBvTa_KhaXl6nuQEKVVEja-dD99JFUa7XMSqQLiLh88fsnuIS8SvtYmZhakix3bGqgzRm&amp;ie=utf-8&amp;f=8&amp;tn=baidu&amp;wd=gromacs%20tutial&amp;inputT=2426">http://www.baidu.com/link?url=AqAoJrMvTNF8TEDLInoLj2ySsz4cr0g4ee6kHbHD6H5EwQnlSAJXyHvcdZHUBvTa_KhaXl6nuQEKVVEja-dD99JFUa7XMSqQLiLh88fsnuIS8SvtYmZhakix3bGqgzRm&amp;ie=utf-8&amp;f=8&amp;tn=baidu&amp;wd=gromacs%20tutial&amp;inputT=2426</a>.</strong></div><div><strong></strong>&nbsp;</div><div><strong>&nbsp;Best wishes,your sincerely</strong></div></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>