一些铜合金浸焊性能的研究

浸渍合金是冷压浸渍、无压浸渍和PDC钻头制过中的重要材料.本研究表明,在真空浸渍牵件下,用组分比例很严格的Cu-Ni-Mn四元合金,可将浸焊温度降低到1050℃,并具有良好的浸焊性能.     

ICP-AES同时测定固体废物浸出液中钡、铍、镉、铬、铜、镍、铅和锌

采用醋酸缓冲溶液对固体废物样品进行浸提,经硝酸-盐酸消解后,ICP-AES测定消解液中的钡,铍,镉,铬,铜,镍,铅和锌。本方法具有检出限低、再现性好、分析效率高等优点,适用于固体废物浸出毒性的测定。     

Spectral characterization of the bioactive principles and antibacterial properties of cold methanolic extract of Olea europaea from the Hail region of Saudi Arabia

This work aimed to identify the bioactive constituents and antibacterial activity of a cold methanolic extract of Olea europaea leaves. GC–MS analysis of the cold methanolic extract of the leaves of O. europaea L. revealed several unique bioactive compounds, including 9,12-octadecadienoic acid (Z,Z)-, n-hexadecanoic acid, 9-octadecenamide, (Z)-, hexadecanoic acid, 2-hydroxy-1-(hydroxymethyl)ethyl ester, squalene, 2-(2-Hydroxy-2-phenylethyl)-3,5,6-trimethylpyrazine, Benzoic acid, 4-formyl-, methyl ester, 2-Methoxy-4-vinylphenol, Vitamin E etc. The FT-IR spectrum revealed distinct fingerprint regions at 3313, 2943, 2831, 1662, 1590, 1449, 1300, 1111, and 1020 cm^?1. The fingerprinting region is associated with the presence of several bioactive chemicals as determined by GC–MS analyses. The methanolic extract of O. europaea leaves revealed a broader spectrum of antibacterial activity. On the other hand, the spectrum of activity was substantially narrower than that of standard ciprofloxacin discs.