数值与“数量名”结构的话题重要性

“数量名”结构中,“一量名”结构所引入实体的话题重要性比“多量名”结构强。这主要体现在,“一量名”引入实体的平均回指次数明显多于“多量名”;“一量名”形式比“多量名”更常用于存现句;“多量名”所引入实体在下文的延续方式和“一量名”不同,包括合指延续和分指延续两种。“一量名”和“多量名”之所以有这样的差别,是因为“一量名”可以指称个体性事物,而“多量名”只能指称集合性事物。叙事语篇中,个体性事物有充当重要话题的优势。不过,在特定的语篇类型、事件类型的需求下,集合性事物也可能具有较高的话题重要性。

“一量名”结构的副词化——以“一窝蜂”为例

现代汉语中有些“一量名”结构已经演化为副词,“一量名”结构的副词化基本上经历了自由短语→习语→副词的演化过程。以“一窝蜂”的演化过程为透视点,从文化、认知和语用视角探寻其演化动因,运用转喻、隐喻和概念整合解释其演化机制,同时探讨“一量名”结构固化的根源,探寻其演化的共同条件、成因和机制,为“数量名”结构的整体研究提供一些参考。

Prediction of the Helix/Sheet Content of Proteins from Their Primary Sequences by Neural Network Method

The amino acid composition and the biased auto-correlation function are considered as features, BP neural network algorithm is used to synthesize these features. The prediction accuracy of this method is verified by using the independent non-homologous protein database. It is shown that the average absolute errors for resubstitution test are 0.070 and 0.068 with the standard deviations 0.049 and 0.047 for the prediction of the content of α-helix and β-sheet respectively. For cross-validation test, the average absolute errors are 0.075 and 0.070 with the standard deviations 0.050 and 0.049 for the prediction of the content of α-helix and β-sheet respectively. Compared with the other methods currently available, the BP neural network method combined with the amino acid composition and the biased auto-correlation function features can effectively improve the prediction accuracy.

Transient Intersubband Optical Absorption in Double Quantum Well Structure

The microscopic equations of motion including many-body effects are derived to study the intersubband polarization in the double quantum well structure induced by an ultrafast pumping infrared light. Based on the selfconsistent field theory, the transient probe absorption coefficient is calculated. These calculations are beyond the previous steady-state assumption. Transient probe absorption spectra are calculated under different pumping intensity and various pump probe delay.

First principles calculation on electronic structure,chemical bonding,elastic and optical properties of novel tungsten triboride

The electronic structures,chemical bonding,elastic and optical properties of the novel hP24 phase WB3 were investigated by using density-functional theory(DFT) within generalized gradient approximation(GGA).The calculated energy band structures show that the hP24 phase WB3 is metallic material.The density of state(DOS) and the partial density of state(PDOS) calculations show that the DOS near the Fermi level is mainly from the W 5d and B 2p states.Population analysis suggests that the chemical bonding in hP24-WB3 has predominantly covalent characteristics with mixed covalent-ionic characteristics.Basic physical properties,such as lattice constant,bulk modulus,shear modulus and elastic constants Cij were calculated.The elastic modulus E and Poisson ratio υ were also predicted.The results show that hP24-WB3 phase is mechanically stable and behaves in a brittle manner.Detailed analysis of all optical functions reveals that WB3 is a better dielectric material,and reflectivity spectra show that WB3 can be promised as good coating material in the energy regions of 8.5-11.4 eV and 14.5-15.5 eV.

Monopole and Coulomb Field as Duals within the Unifying Reissner–Nordstrm Geometry

We are going to prove that the Monopole and the Coulomb fields are duals within the unifying structure provided by the Reissner–Nordstr¨om spacetime. This is accomplished when noticing that in order to produce the tetrad that locally and covariantly diagonalizes the stress-energy tensor, both the Monopole and the Coulomb fields are necessary in the construction. Without any of them it would be impossible to express the tetrad vectors that locally and covariantly diagonalize the stress-energy tensor. Then, both electromagnetic fields are an integral part of the same structure, the Reissner–Nordstr¨om geometry.