由于其独特的导电性能,K_2NiF4型层状La_2NiO_4(LNO)备受各界广泛关注。根据其晶体结构可知,钙钛矿型L_2NiO_3层和LaO层沿着LNO晶体c-轴方向相互交错叠加而成(如图1所示),而其层间由于有大量氧离子存在,从而赋予其优异的电子-离子混合导电性。基于该种特性,近年来也有许多有关其作为中、低温固体燃料电池电极材料(Intermediate or Low temperature
Ethylene is a widely acknowledged positive regulator of leaf senescence. The rate-limiting enzyme that controls ethylene synthesis in higher plants is ACC synthase(ACS). We evaluated the production of
Since Beijing urban Intelligent Transportation Management Systems(ITMS) have been put into use,its operation effects as well as the comprehensive social benefits are much concerned. This article analy