Infrared-to-Visible Frequency up-Conversion in Trivalent Erbium Ions Doped Fluoride Glasses （ZnF2-AlF3-PbF2-LiF）

High-efficiency frequency up-conversion in trivalent erbium ion doped new fluoride glass matrix (ZnF2-A1F3-PbF2-LiF) was investigated. Under 950 nm laser-diode excitation, the glasses gave very intense green, weak red and violet emissions. The up-conversion mechanism is discussed. In addition, the infrared transmittance spectrum, the Raman spectrum and the lifetime of the trivalent erbium states in the samples were measured. The results illustrate the large potential of these new glasses for photonic applications.     

大掺量粉煤灰与矿粉混凝土用水量控制

本文紧扣影响混凝土各项性能的关键指标——用水量,围绕大掺量粉煤灰、矿粉混凝土施工时用水量控制方面出现的问题,结合相关研究,提出了较为全面的、切实有效的用水量控制措施,以保证混凝土质量。对于混凝土施工有积极的借鉴作用。     

浅析城市给水厂污泥的处理

本文在目前给水厂所产生的污泥量数目与日俱增的背景下,阐述了城市给水厂污泥的主要来源、成分及性质、处理工艺、处理过程中所存在问题以及给水污泥的资源化,给水厂污泥处理的资源化,不仅改善水环境,而且能够回收水厂所产生的水损水量,从而起到节约用水的目的。