Abstract: A multi-layer printed circuit board comprises: a core comprising a core insulation layer and traces formed on two sides of the core insulation layer; a plurality of insulation layers sequentially formed at two sides of the core; and a plurality of trace layers respectively formed between two insulation layers and on the outmost insulation layers; wherein the core insulation layer contains a resin material different from that of the insulation layers, such that the core insulation layer has a dimensional stability superior to that of the insulation layers.

Abstract: A multi-layer printed circuit board comprises: a core comprising a core insulation layer and traces formed on two sides of the core insulation layer; a plurality of insulation layers sequentially formed at two sides of the core; and a plurality of trace layers respectively formed between two insulation layers and on the outmost insulation layers; wherein the core insulation layer contains a resin material different from that of the insulation layers, such that the core insulation layer has a dimensional stability superior to that of the insulation layers.

Abstract: A multi-layer printed circuit board comprises: a core comprising a core insulation layer and traces formed on two sides of the core insulation layer; a plurality of insulation layers sequentially formed at two sides of the core; and a plurality of trace layers respectively formed between two insulation layers and on the outmost insulation layers; wherein the core insulation layer contains a resin material different from that of the insulation layers, such that the core insulation layer has a dimensional stability superior to that of the insulation layers.

Abstract: A multi-layer printed circuit board comprises: a core comprising a core insulation layer and traces formed on two sides of the core insulation layer; a plurality of insulation layers sequentially formed at two sides of the core; and a plurality of trace layers respectively formed between two insulation layers and on the outmost insulation layers; wherein the core insulation layer contains a resin material different from that of the insulation layers, such that the core insulation layer has a dimensional stability superior to that of the insulation layers.

Abstract: A characteristic mass spectral fingerprint setting method and a rapid identification method for Chinese herbal medicines or prescriptions are provided, which comprise directly injecting extracts of Chinese herbal medicines or prescriptions into a mass spectrometer with an electrospray ionization interface via an autosampler of a liquid chromatograph without going through a separation column to make a mass spectrum analysis; performing a series of mass spectrum analyses for various Chinese herbal medicines or prescription extracts; picking out the mass spectrum peaks representing the features of each of the Chinese herbal medicines or prescriptions as respective characteristic mass spectral fingerprints to establish a characteristic mass spectral fingerprint database of the Chinese herbal medicine or prescription; directly injecting an extract of the Chinese herbal medicines or prescription to be tested into a mass spectrometer with an electrospray ionization interface to make a mass spectrum analysis; and com