采用电参数测量方法研究陶瓷金卤灯中的声共振现象。测量70 W陶瓷金卤灯在10～300 k Hz之间的电压、电流随频率的变化,从电压波动和阻抗判断22～30 k Hz和210～300 k Hz为无声共振的频率窗口。其次通过4个相同型号灯的参数比较,证实70 ...采用电参数测量方法研究陶瓷金卤灯中的声共振现象。测量70 W陶瓷金卤灯在10～300 k Hz之间的电压、电流随频率的变化,从电压波动和阻抗判断22～30 k Hz和210～300 k Hz为无声共振的频率窗口。其次通过4个相同型号灯的参数比较,证实70 W陶瓷金卤灯频率窗口的离散性很小。实验最后考察了灯在寿命期间频率窗口的变化情况,发现所测陶瓷金卤灯稳定频率窗口是不变的。展开更多
为探究室内全人工光照环境下,3种补光灯具对多肉植物橙梦露生长的影响,本试验以多肉植物橙梦露为试验材料,用3种不同的补光灯具,通过T1、T2、T3处理(T1为红蓝光子数比7∶1的100 W LED灯条,悬挂高度0.3 m,光照强度500μmol/(m^(2)·s...为探究室内全人工光照环境下,3种补光灯具对多肉植物橙梦露生长的影响,本试验以多肉植物橙梦露为试验材料,用3种不同的补光灯具,通过T1、T2、T3处理(T1为红蓝光子数比7∶1的100 W LED灯条,悬挂高度0.3 m,光照强度500μmol/(m^(2)·s),T2为红蓝光子数比7∶1的150 W LED灯筒,悬挂高度0.3 m,光照强度1000μmol/(m^(2)·s),T3为红蓝光子数比7∶1的630 W陶瓷金卤灯,悬挂高度1.2 m,光照强度150μmol/(m^(2)·s),同时通过观察比较多肉植物橙梦露生长发育过程的颜色及形态变化情况来判断多肉品质。研究结果表明,与T3处理相比,T1和T2处理后的多肉植物橙梦露转色效果更好,饱满度更高,生长形态更好。而T1和T2处理后的多肉植物橙梦露在转色和形态上没有明显区别。展开更多
Employing Dy2O3, Al2O3, and SiO2 as starting materials, several series of Dy2O3-Al2O3-SiO2 sealing glass were prepared. The relationship between their coefficients of thermal expansion and the contents of Dy2O3, Al2O3...Employing Dy2O3, Al2O3, and SiO2 as starting materials, several series of Dy2O3-Al2O3-SiO2 sealing glass were prepared. The relationship between their coefficients of thermal expansion and the contents of Dy2O3, Al2O3, and SiO2 were studied respectively. Experimental results showed that Dy2O3 and Al2O3 had a positive effect on the coefficient of thermal expansion of glass, whereas, SiO2 had a negative effect. The coefficient of thermal expansion of glass showed an apparent linear relation to the contents of these three raw materials, from which an estimation model was built, to calculate the coefficient of thermal expansion of sealing glass. Relative errors of the calculating results to testing results were no more than 2%, which suggested that the estimation model was reasonable. This study provides a good theory reference for the practical utilizing of this sealing material, through which a proper glass composition for good sealing could be easily found.展开更多
文摘采用电参数测量方法研究陶瓷金卤灯中的声共振现象。测量70 W陶瓷金卤灯在10～300 k Hz之间的电压、电流随频率的变化,从电压波动和阻抗判断22～30 k Hz和210～300 k Hz为无声共振的频率窗口。其次通过4个相同型号灯的参数比较,证实70 W陶瓷金卤灯频率窗口的离散性很小。实验最后考察了灯在寿命期间频率窗口的变化情况,发现所测陶瓷金卤灯稳定频率窗口是不变的。
文摘为探究室内全人工光照环境下,3种补光灯具对多肉植物橙梦露生长的影响,本试验以多肉植物橙梦露为试验材料,用3种不同的补光灯具,通过T1、T2、T3处理(T1为红蓝光子数比7∶1的100 W LED灯条,悬挂高度0.3 m,光照强度500μmol/(m^(2)·s),T2为红蓝光子数比7∶1的150 W LED灯筒,悬挂高度0.3 m,光照强度1000μmol/(m^(2)·s),T3为红蓝光子数比7∶1的630 W陶瓷金卤灯,悬挂高度1.2 m,光照强度150μmol/(m^(2)·s),同时通过观察比较多肉植物橙梦露生长发育过程的颜色及形态变化情况来判断多肉品质。研究结果表明,与T3处理相比,T1和T2处理后的多肉植物橙梦露转色效果更好,饱满度更高,生长形态更好。而T1和T2处理后的多肉植物橙梦露在转色和形态上没有明显区别。
基金Project supported by the Ministry of Science and Technology of China (2006CB601104)
文摘Employing Dy2O3, Al2O3, and SiO2 as starting materials, several series of Dy2O3-Al2O3-SiO2 sealing glass were prepared. The relationship between their coefficients of thermal expansion and the contents of Dy2O3, Al2O3, and SiO2 were studied respectively. Experimental results showed that Dy2O3 and Al2O3 had a positive effect on the coefficient of thermal expansion of glass, whereas, SiO2 had a negative effect. The coefficient of thermal expansion of glass showed an apparent linear relation to the contents of these three raw materials, from which an estimation model was built, to calculate the coefficient of thermal expansion of sealing glass. Relative errors of the calculating results to testing results were no more than 2%, which suggested that the estimation model was reasonable. This study provides a good theory reference for the practical utilizing of this sealing material, through which a proper glass composition for good sealing could be easily found.
