Redundant operators have led to enormous confusion in the literature over many decades, for example, this was a source of significant confusion in the early days of heavy quark effective theory. For this reason, when choosing a basis, it is advantageous to not introduce redundant parameters. ...
IEC 62504:2014有助于理解与LED技术的一般照明相关的术语和定义.包括的术语是IEC LED标准中已有的术语或制造商文献中使用的术语.本标准提供了描述性术语(如"LED光源")和根据IEC 60050-845修改后的可测量术语(如"显色指数").\n第一版取消并取代了2011年发布的IEC TS 62504.与IEC TS 62504相关的重大变化如下:...
COUNTER, RECIPROCATING, HAND-HELD (S/S BY A-A-2723A)doi:FED GG-C-620C
Methods of test for pulp and paper - Folding endurance of paperdoi:AS P1.P423M-1962