直流偏场和面内场联合作用下第Ⅰ类哑铃畴壁内VBLs的稳定性

研究了直流偏场和面内场联合作用下,液相外延石榴石磁泡膜中第Ⅰ类哑铃畴(ID)畴壁中垂直布洛赫线(VBL)的稳定性.发现,室温时在Hb和Hip的共同作用下,当Hb>H′sb时,ID的剩余率将在某一面内场Hip下迅速下降,即ID畴壁内VBL在某一Hip迅速丢失.随着Hb上升这种下降的趋势越容易发生,并变得更剧烈.通过观察证实,这种下降的趋势与ID的自收缩有关.由此可知,在Hip和Hb的共同作用下ID畴壁中的VBLs丢失的过程中,自收缩起着重要的作用.     

穿孔板空气薄膜阻尼结构隔声特性

为了提高空气薄膜阻尼结构中低频段隔声性能,本文提出采用复合穿孔结构的空气薄膜阻尼结构,即穿孔板空气薄膜阻尼结构。首先,利用FE-SEA混合法构建了空气薄膜阻尼结构的数值模型,并与实验结果进行了对比验证了模型的有效性。在此基础上,研究了穿孔板空气薄膜阻尼结构孔的位置、穿孔率、孔径及孔的形状和排布方式等结构参数对其隔声性能的影响。研究结果表明,在附加板上穿孔使空气薄膜阻尼的隔声性能有明显提升,而基板上穿孔其隔声性能改善效果不佳。并且穿孔率和孔径是影响隔声性能的重要因素,而孔的形状和排列对隔声性能影响不大。本文研究为中低频段空气薄膜阻尼隔声结构设计提供了依据,具有重要的工程应用价值。     

基于知识图谱的国内外人工智能应用领域对比研究

近年来人工智能研究发展迅速,学科范围从计算机科学向脑科学、心理学等交叉学科和边缘学科扩展,受到相关领域学者的广泛关注.论文比较分析国内外人工智能领域的研究现状和前沿趋势,对科研人员进行相关研究具有重要借鉴意义.基于知识图谱的理念,以科学引文索引核心数据库及中国知网数据库作为数据来源,借助CiteSpace文献计量软件梳理 2010年—2018年发表在国内外期刊上的人工智能领域的文献,绘制科学知识图谱,并分别从年度分布、知识基础、研究热点及前沿等方面进行对比分析.结果表明,国内外人工智能领域研究均经历繁荣阶段、稳定发展阶段和新一轮发展阶段,目前国内外的研究内容虽各有侧重,但总体上在大数据、机器学习等方面的研究正在成为热点.     

(-overα)-调和映照的正规性

研究(-overα)-调和映照正规性判别条件.利用Bloch函数,结合预Schwarz导数与线性连结几何特征给出正规(-overα)-调和映照的两个判别定理.     

The folding process of hen lysozyme: a perspective from the ‘new view’

How a conformationally disordered polypeptide chain rapidly and efficiently achieves its well-defined native structure is still a major question in modern structural biology. Although much progress has been made towards rationalizing the principles of protein structure and dynamics, the mechanism of the folding process and the determinants of the final fold are not yet known in any detail. One protein for which folding has been studied in great detail by a combination of diverse techniques is hen lysozyme. In this article we review the present state of our knowledge of the folding process of this enzyme and focus in particular on recent experiments to probe some of its specific features. These results are then discussed in the context of the ‘new view’ of protein folding based on energy surfaces and land scapes. It is shown that a schematic energy surface for lysozyme folding, which is broadly consistent with our experimental data, begins to provide a unified model for protein folding through which experimental and theoretical ideas can be brought together.     

THE IRREGULAR OBLIQUE DERIVATIVE PROBLEM FOR NONLINEAR ELLIPTIC SYSTEMS OF SECOND ORDER

1.TheirregularObliqueDerivativeProblemanditsWell-PosednessforNonlinearEllipticSystemsLabDbean(N 1)-connectedboundeddomaininthez=x ic-planeCwithboundaryFECI(0相似文献   

无界区域上拟线性方程共振问题

考虑了具有无界非线性项的拟线性椭圆方程在无界区域上的共振问题。应用鞍点定理及极小作用原理,得到了弱解的存在性定理．     

确定分块SOR迭代法收敛域的一般方法

本文利用判定多项式的全部根位于单位圆内的Ｓｃｈｕｒ准则，给出了一个确定ｐ－循环矩阵ＳＯＲ迭代法的收敛域的一般方法，该方法具有广泛的适用性，作为例子，本文较简洁地将迄今为止有关ＳＯＲ收敛域的已知结果统一了起来，此外，本文给出的方法容易推广到广义相容次序矩阵的ＳＯＲ，以及ＳＳＯＲ和ＭＳＯＲ方法的收敛域问题中去。     

SV40 transformed fibroblasts recognize the same 140 kD fibronectin chemotactic fragment as non-transformed cells

Summary SV40 virus-transformed human embryonal fibroblasts show an enhanced chemotactic response to the glycoprotein fibronectin. However, they recognize the same chemotactic active region as non-transformed fibroblasts. The result suggests that an enhancement of chemotaxis by fibroblasts which have been transformed with Simian Virus 40 is due not to the utilization of further chemotactic domains in the molecule, but to an increased sensitivity of the cells to the chemoattractant.     

THE POTENTIALITY OF ENERGY-SAVING IN SHUTTLE LOOMS

In this paper,the effects of loom speed fluctuation on the mean speed and on the power ofdriving motor were investigated and the expressions for these effects were derived.Based on theenergy relationships,a new index of equivalent fluctuation was introduced,the connection be-tween this equivalent fluctuation and the energy of speed function on frequency domain was thenfound.In addition to the above theme,the residual kinetic energy of the shuttle and pickingmechanism,taken as a considerable part in the potentiality of loom energy-saving was also ana-lysed.According to the results of theoretical analyses,the ways of energy-saving in looms weresuggested.Finally,taking the loom of 1511 type as a practical example,the potentiality ofenergy-saving was calculated.