The production of colored flames is the primary purpose of military signaling, projectile tracing, and illuminating devices. Certain elements and compounds when heated to high temperature have the unique property of e...The production of colored flames is the primary purpose of military signaling, projectile tracing, and illuminating devices. Certain elements and compounds when heated to high temperature have the unique property of emitting lines or narrow bands in the visible region(380-780 nm). This study, reports on the development of novel yellow colored flame compositions with enhanced spectral performance in terms of luminous intensity, and color quality to standard Russian yellow tracer. The light intensity and the imprint spectra of developed yellow flares were measured using digital luxmeter and UV e Vis. spectrometer respectively. The main giving of this study is that the light intensity, and color quality of Russian yellow tracer were improved by 287%, and 170% respectively. This was accomplished by means of optimizing the ratio of novel binder to color source using aluminum metal fuel. Aluminumbased formulations were found to maximize the formation of yellow reactive emitting specimens, and to eliminate any interfering incandescent emission resulted from Mg O. Quantification of yellow color emitting specimens in the combustion gaseous products was achieved using chemical equilibrium thermodynamic code named ICT(Institute of Chemical Technology in Germany, Virgin 2008); in an attempt to judge the light quality. This improvement in yellow flare performance established the rule that the emission intensity increases as the reaction temperature increases. In the meantime upper limit of temperature was avoided to maximize the color quality.展开更多
以微波消解法处理鱼肉样品,用火焰原子吸收光谱法测定鲶鱼、胖头鱼、小黄花鱼、鲫鱼4 种鱼肉中的钾、钠、镁、钙、铁、钴、镍、铜、锌、锰、锶、铬、镉和铅元素含量.鱼肉样品以5 mL HNO3 和1 mL H2O2 在一定的温度和时间下经微波消解处...以微波消解法处理鱼肉样品,用火焰原子吸收光谱法测定鲶鱼、胖头鱼、小黄花鱼、鲫鱼4 种鱼肉中的钾、钠、镁、钙、铁、钴、镍、铜、锌、锰、锶、铬、镉和铅元素含量.鱼肉样品以5 mL HNO3 和1 mL H2O2 在一定的温度和时间下经微波消解处理后,在最佳工作条件下测定以上14 种金属元素含量,各元素的加标回收率在95.4%～104.6%之间,检出限为0.001 1-0.012 9 μg/mL,标准工作曲线的线性相关系数均大于0.999,该方法测定结果的相对标准偏差为0.71%～4.28%（n=10）.该方法适用于鱼肉中钾、钠、镁、钙、铁、钴、镍、铜、锌、锰、锶、铬、镉和铅14 种金属元素的含量测定.展开更多
基金funding the research project entitled“Enhanced Visible Tracers for Illumination and Tracking”
文摘The production of colored flames is the primary purpose of military signaling, projectile tracing, and illuminating devices. Certain elements and compounds when heated to high temperature have the unique property of emitting lines or narrow bands in the visible region(380-780 nm). This study, reports on the development of novel yellow colored flame compositions with enhanced spectral performance in terms of luminous intensity, and color quality to standard Russian yellow tracer. The light intensity and the imprint spectra of developed yellow flares were measured using digital luxmeter and UV e Vis. spectrometer respectively. The main giving of this study is that the light intensity, and color quality of Russian yellow tracer were improved by 287%, and 170% respectively. This was accomplished by means of optimizing the ratio of novel binder to color source using aluminum metal fuel. Aluminumbased formulations were found to maximize the formation of yellow reactive emitting specimens, and to eliminate any interfering incandescent emission resulted from Mg O. Quantification of yellow color emitting specimens in the combustion gaseous products was achieved using chemical equilibrium thermodynamic code named ICT(Institute of Chemical Technology in Germany, Virgin 2008); in an attempt to judge the light quality. This improvement in yellow flare performance established the rule that the emission intensity increases as the reaction temperature increases. In the meantime upper limit of temperature was avoided to maximize the color quality.
