简介:ZrO_2-SnO_2-TiO_2(ZST)系统陶艺的微波电介质性质作为Sb_2O_5掺杂物的数量的功能被学习。与0-0的增加。5%Sb_2O_5(臼齿的比率),有Sb~(5+)离子的Ti~(4+)离子的替换减少了sintering温度并且由于氧空缺的减小增加了优秀因素Q。当Sb~(5+)的数量进一步增加了时(超过0.5%)。Q被增加电子浓度减少。当与0.5%Sb_2O_5做的系统是在为6h的1150℃的sintered时,相对的绝缘的经常的ε,Qf_0,和反响的频率(TCF)的温度系数是38.46,44500GHz,20.0x10~(-6)/℃,分别地,在6GHz。
简介:while approximately the other 30-35% of the patents have received endovascular coiling. Optimal treatment of patients with intracranial aneurysm requires a highly experienced center that is capable of both coiling and clipping.,Current diagnostic Tests for Intracranial Aneurysms Patients with ruptured aneurysms producing SAH are usually diagnosed by CT scan. However,Current treatment Options for Intracranial Aneurysms Aneurysms that have ruptured require treatment to prevent another rupture (rebleeding). Following the initial rupture of an aneurysm
简介:a series of share issue privatizations can indeed promote the growth of global capital market,Privatisation International [Gibbon (1998,This has told the reason of the fast growth of global capital market. And then I succinctly indicated the continuance of the rapid growth