贝壳

The nacre of molluscan shell, which is composed of inorganic aragonite tablets and a few percent of organic polymers filling between the tablets, is a wonderful natural composite material. It shows complex forms, and fascinating mechanical and optical properties.

软体动物的贝壳珍珠质是由文石板片(CaCO_3晶体)以及少量填充在板片之间的有机质组成的一种天然的复合材料，具有复杂的形貌以及良好的力学性能、光学性能，其文石板片与有机基质交替叠层排列的微结构以及文石晶体的结晶学取向是珍珠层具有优异的力学性能的重要原因之一。

The results suggest -2.68‰ PDB as being the regional value for δ^13C for those molluscan shells, including foraminifera/ostrocode from the brackish water masses and open shallow sea i.

建议以-2.68‰ PDB作为环渤海晚更新世晚期以来半咸水和开放浅海区贝壳的地区δ^3C平均值。

PDB as being the regional value for δ13C for those molluscan shells, including foraminifera/ostrocode from the brackish water masses and open shallow sea (i.e. the intertidal and the upper part of the subtidal) for the period since the late Late Pleistocene.

建议以-2.68‰ PDB作为环渤海晚更新世晚期以来半咸水和开放浅海区贝壳的地区性δ13C平均值。

But the effect of the soluble proteins on the changes of the architecture of the preformed mollusk shells is still unknown.

但可溶性蛋白对已形成的软体动物贝壳微观结构可能产生的影响，仍然是未知数。

This paper studies pyrogenation of freshwater breeding nacre and mussel,and discusses the influence of shell on the pyrogenation process of macromolecule material.

本文研究了淡水养殖珍珠贝和淡水蚌壳的热分解行为，并且探讨了贝壳对高分子材料热降解行为的影响。

A shell graph of order n denoted by H(n,n-3) is the graph obtained from cycle C_n of order n by adding n- 3 chords incident with a common vertex say u.

一个有n个顶点的贝壳图H(n，n-3)，是通过在顶点数为n的圈C_n上一个公共点u上增加n-3条边得到的图。

Structure characteristics of laminated composites in nature such as nacre are described briefly in this paper.

以贝壳珍珠层为例，简要介绍了天然叠层状生物材料的结构特征，并针对叠层状仿生材料的设计原理、制备技术及其研究现状等方面加以综述。

The idea of designing intermetallics based laminated composites is derived from the microstructure of nacre in the nature.

金属间化合物基叠层复合材料是受自然界中贝壳结构的启发而设计的一种新型高温结构材料。

These results offer new insight into the study of the nacre formation.

对同一三角帆蚌贝壳珍珠层，文石晶体的这两种择优取向的程度随壳结构位置的变化而变化，反映了三角帆蚌珍珠层结构的不均匀性，为研究珍珠层的成因提供了新的思路。

Microstructure of nacre is significant to understand the behavior of nacre and the biomimetic designing of materials.

本文利用扫描电镜原位观察了受拉伸载荷作用下珍珠层中裂纹的萌生及扩展方式，并结合SEM和TEM技术研究了贝壳珍珠层微观组织结构，探讨了裂纹扩展过程中的增韧机制。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。