Glass ceramics Ba2LaFT：xDy3＋ are obtained through the conventional melt-quenching technique, and their lu- minescent properties are investigated. Under 350 nm excitation, the emission spectra consists of a strong bl...Glass ceramics Ba2LaFT：xDy3＋ are obtained through the conventional melt-quenching technique, and their lu- minescent properties are investigated. Under 350 nm excitation, the emission spectra consists of a strong blue- yellow band as well as a weak red emission centered at 660 nm, which are attributed to the 4F9/2 →6H15/2, 4F9/2→6H13/2 and 4F9/2 → 6Hll/2 transitions of the Dy3＋ ion, respectively. The corresponding Commission Internationale de L＇Eclairage （CIE） chromaticity coordinate for a sample of 2 mol.% Dy203 after being heat-treated at 690℃ is （0.313, 0.328）. It is concluded that the formed materials may have the possibility of applications for white light-emitting diodes （LEDs）.展开更多
白三叶营养丰富,蛋白质含量高,是最重要的牧草之一。文章对SPAD及FT-NIR光谱法筛选白三叶种质蛋白质性状进行了探讨。采用Chlorophyll Meter SPAD-502,测定白三叶叶片SPAD值,从而评估其蛋白质含量。在营养生长期内,叶片蛋白质含量与SPA...白三叶营养丰富,蛋白质含量高,是最重要的牧草之一。文章对SPAD及FT-NIR光谱法筛选白三叶种质蛋白质性状进行了探讨。采用Chlorophyll Meter SPAD-502,测定白三叶叶片SPAD值,从而评估其蛋白质含量。在营养生长期内,叶片蛋白质含量与SPAD值呈正相关(y=0.422x+4.984,R2=0.737);在开花期内,两者之间呈负相关(y=-0.345x+37.50,R2=0.711)。应用傅里叶变换近红外(FT-NIR)光谱技术,用偏最小二乘法建立了白三叶蛋白质的预测模型,并对模型进行了交叉验证和外部验证。结果表明,用NIRS法得到的预测值与用凯氏定氮法得到的测定值间的交叉验证决定系数R2cv为0.904,交叉检验标准误差RMSECV为0.988(%DM),外部验证的相关系数为0.987。所建立的近红外模型具有良好的准确性和预测能力。FT-NIR法较SPAD法能更准确的评估白三叶蛋白质状况。NIRS作为一种白三叶粗蛋白质快速分析的技术是可行的,在白三叶蛋白质品质育种中,可快速进行种质资源筛选,提高育种效率。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61275180 and51472125)the K.C.Wong Magna Fund of Ningbo University
文摘Glass ceramics Ba2LaFT：xDy3＋ are obtained through the conventional melt-quenching technique, and their lu- minescent properties are investigated. Under 350 nm excitation, the emission spectra consists of a strong blue- yellow band as well as a weak red emission centered at 660 nm, which are attributed to the 4F9/2 →6H15/2, 4F9/2→6H13/2 and 4F9/2 → 6Hll/2 transitions of the Dy3＋ ion, respectively. The corresponding Commission Internationale de L＇Eclairage （CIE） chromaticity coordinate for a sample of 2 mol.% Dy203 after being heat-treated at 690℃ is （0.313, 0.328）. It is concluded that the formed materials may have the possibility of applications for white light-emitting diodes （LEDs）.
文摘白三叶营养丰富,蛋白质含量高,是最重要的牧草之一。文章对SPAD及FT-NIR光谱法筛选白三叶种质蛋白质性状进行了探讨。采用Chlorophyll Meter SPAD-502,测定白三叶叶片SPAD值,从而评估其蛋白质含量。在营养生长期内,叶片蛋白质含量与SPAD值呈正相关(y=0.422x+4.984,R2=0.737);在开花期内,两者之间呈负相关(y=-0.345x+37.50,R2=0.711)。应用傅里叶变换近红外(FT-NIR)光谱技术,用偏最小二乘法建立了白三叶蛋白质的预测模型,并对模型进行了交叉验证和外部验证。结果表明,用NIRS法得到的预测值与用凯氏定氮法得到的测定值间的交叉验证决定系数R2cv为0.904,交叉检验标准误差RMSECV为0.988(%DM),外部验证的相关系数为0.987。所建立的近红外模型具有良好的准确性和预测能力。FT-NIR法较SPAD法能更准确的评估白三叶蛋白质状况。NIRS作为一种白三叶粗蛋白质快速分析的技术是可行的,在白三叶蛋白质品质育种中,可快速进行种质资源筛选,提高育种效率。
