This paper investigates the verb valency structure of English that is used by English as Foreign Language(EFL)learners from a corpus-driven perspective.Specifically,it focuses on the usage of the verbs“suggest”and“...This paper investigates the verb valency structure of English that is used by English as Foreign Language(EFL)learners from a corpus-driven perspective.Specifically,it focuses on the usage of the verbs“suggest”and“advise”in a selected corpus.By analyzing a sample of written and spoken texts,this study attempts to investigate the similarities and differences in the patterns of verb valency between native English speakers and Chinese EFL learners.The findings of this research can contribute to a better understanding of the challenges faced by Chinese EFL learners in acquiring accurate verb valency structures and provide insights for language teachers in designing effective pedagogical approaches.展开更多
MOST rare earth ions are inclined to exist in abnormal valency, and the properties of rare earth correspond to the valence state of rare earth closely Both europium and terbium have abnormal valence state. Eu<sup&g...MOST rare earth ions are inclined to exist in abnormal valency, and the properties of rare earth correspond to the valence state of rare earth closely Both europium and terbium have abnormal valence state. Eu<sup>3+</sup> and Tb<sup>3+</sup> ions are a couple of conjugate rare earth ions; they are both important activated ions. The present note reports the luminescent properties of SrB<sub>6</sub>O<sub>10</sub> xEu, yTb phosphors which are synthesized in air atmosphere. Eu<sup>3+</sup>, Eu<sup>2+</sup> and Tb<sup>3+</sup> ions can coexist in SrB<sub>6</sub>O<sub>10</sub>: xEu, yTb phosphors, and the emission intensity of europium（Ⅱ） is increased if the concentration of terbium（Ⅲ） is increased in SrB<sub>6</sub>O<sub>10</sub>: 0.006Eu<sup>3+</sup>, yTb<sup>3+</sup>展开更多
本文译自美国《Journal of chemical Education》1988年第8期.作者简介了密立根布居数分析法,并以此为基础讨论了键级和化合价,应用了别致的原子轨道线性组合分子轨道理论(LCAO—MO)的矩阵公式.最后给出了一些简单分子的计算结果,以说...本文译自美国《Journal of chemical Education》1988年第8期.作者简介了密立根布居数分析法,并以此为基础讨论了键级和化合价,应用了别致的原子轨道线性组合分子轨道理论(LCAO—MO)的矩阵公式.最后给出了一些简单分子的计算结果,以说明这个理论的应用.展开更多
The electronic transition emission of Eu<sup>2+</sup> is in close relationship with the crystal-field environment and chemical bond property of Eu<sup>2+</sup> in hosts. The stronger the crysta...The electronic transition emission of Eu<sup>2+</sup> is in close relationship with the crystal-field environment and chemical bond property of Eu<sup>2+</sup> in hosts. The stronger the crystal-field intensity is, the larger the splitting of the 5d level is and the more favourable the broad band emission of d-f transition is. The smaller the covalency is, the smaller the展开更多
The paper presents the prerequisites of involving of topological elements and graph theory as an instrument of mathematical formalization of woven structures and technology of textile fabrics. Present research is base...The paper presents the prerequisites of involving of topological elements and graph theory as an instrument of mathematical formalization of woven structures and technology of textile fabrics. Present research is based on analysis and comparison of the main concepts and conditions of textile technology and graph theory.展开更多
The present paper shows the mathematical approach of formalization of textile fabrics, based on concepts and elements of graph theory and the structural analysis of woven structures and possibility of numerical evalua...The present paper shows the mathematical approach of formalization of textile fabrics, based on concepts and elements of graph theory and the structural analysis of woven structures and possibility of numerical evaluation of interlacing factor of warp and weft threads in woven structures through the weight of a structural graph vertex. Research observes quantitative aspect of structural evaluation of threads topology in fabric focusing in graph theory, in order to present an application productivity of this theory to solve the technological tasks.展开更多
文摘This paper investigates the verb valency structure of English that is used by English as Foreign Language(EFL)learners from a corpus-driven perspective.Specifically,it focuses on the usage of the verbs“suggest”and“advise”in a selected corpus.By analyzing a sample of written and spoken texts,this study attempts to investigate the similarities and differences in the patterns of verb valency between native English speakers and Chinese EFL learners.The findings of this research can contribute to a better understanding of the challenges faced by Chinese EFL learners in acquiring accurate verb valency structures and provide insights for language teachers in designing effective pedagogical approaches.
文摘MOST rare earth ions are inclined to exist in abnormal valency, and the properties of rare earth correspond to the valence state of rare earth closely Both europium and terbium have abnormal valence state. Eu<sup>3+</sup> and Tb<sup>3+</sup> ions are a couple of conjugate rare earth ions; they are both important activated ions. The present note reports the luminescent properties of SrB<sub>6</sub>O<sub>10</sub> xEu, yTb phosphors which are synthesized in air atmosphere. Eu<sup>3+</sup>, Eu<sup>2+</sup> and Tb<sup>3+</sup> ions can coexist in SrB<sub>6</sub>O<sub>10</sub>: xEu, yTb phosphors, and the emission intensity of europium（Ⅱ） is increased if the concentration of terbium（Ⅲ） is increased in SrB<sub>6</sub>O<sub>10</sub>: 0.006Eu<sup>3+</sup>, yTb<sup>3+</sup>
基金Project supported by the National Natural Science Foundation of China.
文摘The electronic transition emission of Eu<sup>2+</sup> is in close relationship with the crystal-field environment and chemical bond property of Eu<sup>2+</sup> in hosts. The stronger the crystal-field intensity is, the larger the splitting of the 5d level is and the more favourable the broad band emission of d-f transition is. The smaller the covalency is, the smaller the
文摘The paper presents the prerequisites of involving of topological elements and graph theory as an instrument of mathematical formalization of woven structures and technology of textile fabrics. Present research is based on analysis and comparison of the main concepts and conditions of textile technology and graph theory.
文摘The present paper shows the mathematical approach of formalization of textile fabrics, based on concepts and elements of graph theory and the structural analysis of woven structures and possibility of numerical evaluation of interlacing factor of warp and weft threads in woven structures through the weight of a structural graph vertex. Research observes quantitative aspect of structural evaluation of threads topology in fabric focusing in graph theory, in order to present an application productivity of this theory to solve the technological tasks.
