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The expressions of the form factors only depend on the leading twist distribution amplitude of the D meson.
所获得的形状因子的表达式仅依赖于D介子的主导级分布振幅。
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This project studies the scale-dependent deformation behavior of the metal matrix composite, the void nucleation and void growth mechanisms at the micron/submicron scale. The main results are:(1) In prophase, growth and coalescence of the void embedded in the graded matrix are analyzed in detailed;(2) Based on the infinite solid model containing a micro-void, coupling effects of the void shape and the void size on the void growth are studied carefully, the results show that it seems to exist a critical equivalent void radius, which is associated with the material length. When radius of a microvoid is close to or smaller than the critical void radius, the micro-void growth rate is essentially eliminated;(3) The coupling effects of the particle shape and size on the mesoscopic stress fields within the particle and matrix are also investigated by introducing the conception of inclusion/matrix interfacial energy. The results show that the stress concentration factors within the particle and on the matrix/particle interface are also strongly size-dependent,so the void nucleation mechanism is size-dependent.(4) By employing a specific orthogonal curve coordinate frame and a 'kernel function' conception, a 'unified method'solving the spheriodal and spherical void problems is suggested; by this unified method, size-dependent plastic potentials of the porous materials containing the spheriodal or spherical voids are obtained, which extend the traditional Gurson model for the spherical void and GLD model for the spheriodal voids to the micron scale.(5) Based on the RVE model containing the spheriodal or spherical particles, the influences of the particle shape and size on the size-dependent mechanical behavior of metal matrix composite are studied.
中文摘要:本项目对金属基复合材料在微细观尺度下的尺度相关变形行为、孔洞形核及长大的机理和模型进行了研究,取得了如下主要结果:1)在前期研究中,探讨了基体的梯度分布对孔洞长大和聚合的影响;2)基于含孔洞的无限大体模型,探讨了孔洞形状和孔洞尺寸对其长大的耦合作用,结果表明:可能存在一个与材料特征长度相关的临界孔洞尺寸,当椭球孔洞的等效半径小于临界孔洞半径时,孔洞的长大受到明显抑制;3)通过引入基体/夹杂界面能的概念,分析了夹杂尺寸、夹杂形状对材料细观应力场的耦合影响,结果表明:颗粒内部和界面上的应力集中因子强烈地依赖于夹杂的尺寸和形状,因此,孔洞的形核机理是尺寸相关的;4)采用一种特殊的正交曲线坐标系和引入"核函数"的概念,"统一"地得到了含椭球和球形孔洞的材料的尺寸相关塑性势,它将传统的Gurson球形孔洞模型和GLD椭球孔洞模型推广到微尺度范围;5)基于含椭球和球形夹杂的体胞模型,初步研究了夹杂形状、夹杂尺寸对金属基复合材料尺寸相关力学行为的影响。
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We think , nutrition component and microelement needed by the human body gains in need not be dependent on water , being able to completely from food.
我们认为,人体所需要的营养成分和微量元素不必依赖于水,完全可以从食物中获取。
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Respectively, the same as those of the sample using micrometer B a...
这表明MgB2相形成的温度并不特别依赖于硼粉的尺寸。
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It is silly to depend on Middle Eastern countries for our oil supplies.
把我们的石油供应都依赖于中东国家是鲁莽的。
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We value an America that controls its own destiny because it's finally and forever independent of Mideast oil.
我们珍重一个最终并且永不依赖于中东的石油,从而控制自己的命运的美国。
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The next phase will be to be trial offer depending on the cost for two or three cycles to an individual so the key milady pregnancy rate can begin to be respectable numbers.
下一阶段的提供依赖于两个或三个周期的成本,这要针对个体,这样主要的怀孕率才能开始提高。
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The quantity depended on the fluoride content supposed and also according to preliminary test ensuring the millivolt value to be among the standard curve.
结果依赖于假定的氟化物含量及预实验,用以确定微伏值在标准曲线之内。
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E. MCNG-ISOMAP (Minimal Connected Neighborhood Graph-based ISOMAP), which can prune effectively "shortcut" edges, existed possibly in the neighborhood graph, based on that the minimal connected neighborhood graph can avoid "shortcut" edges effectively.
该算法能在一定程度上避免邻域大小难以有效选取的问题,同时还能在不依赖于邻域大小的情况下发现数据真正的固有维数。
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to investigate the dependence of insulin sensitivity index and glucose effectiveness on the insulin kinetics parameters by using minimal model.
研究用最小模型法估计的胰岛素敏感性指数和葡萄糖利用效能是否强烈依赖于胰岛素动力学模型参数的变化。
- 推荐网络例句
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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".
歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。
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This is Kate, and that's Erin.
这是凯特,那个是爱朗。
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Articulate the aims, objectives and key aspects of a strategic business plan.
明确的宗旨,目标和重点战略业务计划。