论网络环境下图书馆职能的变化

根据由于电子信息网络的发展状况,论述了网络图书馆职能的变化。     

Women''''s Vocabulary——Different Languages for Different Sexes

Sex differences are a fundamental fact of human life and it is not surprising to find them reflected in language.It's said that women tend to use more standard forms of English,while men tend to use less standard forms of English.Over the past thirty years,and as a result of the women's movement,gender issues have become entangled with issues of language.Recent research indicates that sex may be more fundamental as an influence on sociolinguistic variation than has been recognized so far.This article will try to discuss the different language use between men and women.     

新型荧光增白剂的合成和表征

以4,4'-二(氯甲基)联苯、亚磷酸三乙酯、2,4-二氯苯甲醛为原料通过Arbuzow重排和Wittig-Horner缩合反应合成了新型荧光增白剂4,4'-双(2,4-二氯苯乙烯基)联苯.该化合物用IR、1H-NMR、13C-NMR、MS、元素分析等进行了结构表征.荧光分析表明其强度比常用的荧光增白剂VBL高4.5倍.     

经济全球化背景下人的发展

阐述了经济全球化对人的发展既有使个人需要的相对丰富,可以提高人的文化品位等积极影响,也有受益不均,发展机会不平衡、贬抑人的价值等消极影响的论点.指出要趋利避害,为人的发展创造良好的环境.     

前驱体溶液pH值对溶胶凝胶制备钛酸铋薄膜的影响

采用溶胶凝胶技术在石英玻璃基片上制备钛酸铋薄膜,讨论了前驱体溶液的酸碱度（ｐＨ值）对薄膜结构和结晶性的影响．ｐＨ＜２和ｐＨ＞３５的前驱体溶液所制备的薄膜在晶化过程中出现Ｂｉ２Ｔｉ２Ｏ７和Ｂｉ２Ｔｉ４Ｏ１１杂相．ｐＨ＝２５～３５的前驱体溶液制备的薄膜是钙钛矿Ｂｉ４Ｔｉ３Ｏ１２结构的取向薄膜     

中药饲料添加剂的研究和应用

中药饲料添加剂饲喂畜禽可使其生产性能和免疫力得到明显的改善，同时能够防治疾病。其作用机理在于中药饲料添加剂含有丰富的维生素、矿物元素、氨基酸等营养物质和生物碱、甙类、挥发油、鞣酸等有效成分以及活性物质。     

Genetic analysis and molecular mapping of a presenescing leaf gene psll in rice （Oryza sativa L.）

A rice psl1 （presenescing leaf） mutant was obtained from a japonica variety Zhonghua 11 via radiation of ^60Co-γ in M2 generation. Every leaf of the mutant began to wither after it reached the biggest length, while the leaves of the wild variety could keep green for 25--35 d. In this study, genetic analysis and gene mapping were carried out for the mutant identified. The SSR marker analysis showed that the mutant was controlled by a single recessive gene （psl1） located on chromosome 2. Fine mapping of the psl1 locus was conducted with 34 new STS markers developed around psl1 anchored region based on the sequence diversity between Nipponbare and 93-11. The psl1 was further mapped between two STS markers, STS2-19 and STS2-26, with genetic distances of 0.43 and 0.11 cM, respectively, while cosegregated with STS2-25. A BAC contig was found to span the psl1 locus, the region being delimited to 48 kb. This result was very useful for cloning of the psl1 gene.     

大气颗粒物的分形特征

介绍了大气颗粒物的分形特征，及其研究意义。回顾了国内外用实验方法测定大气颗粒物分维和用计算机模拟凝聚计算分维的发展情况，展望了大气颗粒物分形性质的研究方向。     

Multiple change-points estimation of moving-average processes under dependence assumptions

In this paper, some results of convergence for a least-square estimator in the problem of multiple change-points estimation are presented and the moving-average processes of ρ-mixing sequence in the mean shifts are discussed. When the number of change points is known, the consistency of change-points estimator is derived. When the number of changes is unknown, the consistency of the change-points number and the change-points estimator by penalized least-squares method are obtained. The results are also true for φ-mixing, α-mixing, associated and negative associated sequences under suitable conditions.     

Novel multiferroicity in orthorhombic SmCrO3

This paper reports the ferroelectricity in antiferromagnetic SmCrO_3 with a reasonably large value of spontaneous electric polarization(70μC/cm~2mC cm~(-2)at 50 K)based on the measurement of pyroelectric current.The experimental results showed that the temperature of the onset of polar order was evidently higher(about220 K)than the Neel temperature(T_N=197 K)in the magnetodielectric studies.The calculated magnetodielectric effect(MDE)value was explicitly negative with maximum|MDE|values of about 3.6%around 230 K.The absence of a convincing signature in MDE at antiferromagnetic ordering temperature T_Nindicated the absence of magnetoelectric coupling around this temperature regime.The results further confirmed that the onset of polar order can be attributed to the structural distortion,rather than the canted noncollinear magnetic structure.