查询词典 porous

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。

We also propose form the viewpoint of micromechanics the condition of instability of the microstructure of porous materials and apply it to the analysis of the internal void-necking fracture process.

同时本文还从细观力学的角度出发建立了含微孔材料连续介质微结构的失稳条件，并以此为基础对延性金属材料的微孔内颈缩断裂进行了分析。

At the same time ,the mechanism of porous β-TCP ceramics drug carrier are discussed, and then present a viewpoint that the drug release are controlled by drug stripping and penetrating from micropore.

初步探讨了β-TCP陶瓷药物载体的释药机制，认为其是由药物的溶出和微孔的渗透共同控制的。

The microprobe analysis shows that the multilayers exhibit a lamellar structure consisting of alternating dense and porous layers.

显微技术分析表明每个多层膜是由一系列厚度几乎相等的致密层和厚度也近乎相同的多孔层交替排列形成的一维周期性结构。

Using scanning electron microscopy and computer simulation,the microstructures of porous silicon have been studied.

用扫描电子显微镜对多孔硅的结构进行了分析。

Based on extensive application and efficiency of macroporous resin, the background of porous ceramic microsphere and achievement are presented.

鉴于大孔树脂吸附技术的大规模应用和分离高效性，提出了我课题组正在研制的多孔陶瓷微球的应用背景和取得的工作成果。

Noise-proof: Because having a minimum density and internal porous, wall materials have strong sound absorption features. Noise-proof effect that can achieve 40 dB or more is better than concrete and other building materials. Walls make you have a quiet and comfortable living space in the complex world.

隔音：墙体原料自身密度小，且内部有微孔，具有很强的吸音功能，其隔音效果优于混凝土等建筑材料，可达到40分贝以上，在繁杂喧闹的世界中，墙体让您拥有一个安静舒适的生活空间。

The scales formed on the alloys consisted mostly of TiO2 and minor Al2O3. The scale thickness of the two alloys in water-vapor containing air is much thicker and more porous, which is responsible for the fast oxidation rates, as compared to that in dry air.

种合氧化后的主要生成TiO2，并有少Al2O3生成，其中Al2O3愈往内部氧化层的含愈少；此外，含水汽下的氧化层结构明显较为松散，是氧化速较乾空气快的主因。

The relationship between minority carrier life and morphology with luminescent properties in porous silicon was studied.

研究了不同时间腐蚀的多孔硅的光致发光性能与多孔硅的表面形貌和少子寿命之间的关系。

The surface morphology of the porous silicon samples was observed by the field emission scanning electron microscopy and the atom force microscopy and microwave photo-conductance decay technique was first used to measure the minority carrier lifetime of PS.

结果表明，多孔硅的发光来自与氧空位有关的缺陷，而多孔硅表面的氢原子能够钝化多孔硅表面的非辐射中心从而提高多孔硅的发光效率。

The production moved off-Broadway to New York City, where she won the Joseph E. Calloway award for her performance, and was profiled in American Theater Magazine as one of ten young theater artists to watch.

生产提出过百老汇的新的纽约市，在那里她赢得了约瑟夫calloway奖，她的表现，并于异型在美国的战区杂志之一， 10战区的青年艺术家观赏。

It's a risk tradeoff, and I believe that adding test support code usually wins.

这是一个风险的权衡，我相信添加测试代码通常会占上风。