查询词典 porous

Pottery made from a porous clay that is fired at relatively low temperatures. Faience, delft, and majolica are examples of earthenware.

代尔夫特精陶上釉陶器的一种类型，通常蓝白相间，最初是在荷兰的代尔夫特制造

A thick porous chalk subsoil covered with marl, clay or sand.

粗稠的，上面盖有泥灰，沙砾和粘土的底层土

Generally the numerical stimulation on flow field and temperature field of shell distance is based on porous medium model.

以往对换热器壳程流场和温度场的数值模拟都是建立在多孔介质模型基础上进行的，存在许多问题。

The blood compatibility and cell compatibility experiments disclose the latter porous calcium metaphosphate glass ceramics have good biological compatibility.

血液相容性实验和细胞黏附实验表明前者生物相容性不佳，后者良好。

Phosphate porous starch and PVA were cross linked by methenamine and boric acid Crystal area was serious destroyed by esterification and cross linked. 6 Biodegradation experiment was carried out with soil-burying method.

5红外光谱和X-射线衍射的结构分析表明：在改性淀粉的羟基上引入了磷酰基团，并未破坏原淀粉的基本化学结构；交联剂在改性淀粉和PVA之间形成了C-O-C化学交联键；酯化和交联反应均有较强的淀粉晶区破坏作用。

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。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。