金刚石

The MR effects of diamond films and the related problems have been studied systemically in this dissertation.

本文对金刚石薄膜的磁阻效应及其相关问题进行了较为系统和深入的研究。

In this paper, material properties of the segment of the porous metal-bonded diamond grinding wheel were researched by finite element simulation. Segments were manufactured according to the design result and their elastic modulus was measured. The key points are as follows: The influence of the porosity on the elastic modulus was analyzed through a finite element method. In the FEM model, the design variable only includes the porosity, and the tetrakaidecahedron model is applied as the microstructure model of porous metal matrix. The corresponding porosity was decided in order to meet the requirement of the elastic modulus.

本文利用有限元软件对多孔金属结合剂金刚石砂轮节块的材料性能进行了数值模拟计算，依设计结果制备了节块试样，并测试了节块的弹性模量，主要内容有： 1、充分借鉴多孔材料结构设计和分析的方法，以十四面体模型为多孔金属胎体的微观结构模型，以孔隙率为设计变量，通过有限元分析，计算出满足一定弹性模量要求的多孔金属胎体的孔隙率范围。

By using synchrotron radiation energy dispersive X-ray diffraction and diamond-anvil-cell technology at room temperature,the in-situ high pressure structure of natural titanite had been studied experimentally.

利用同步辐射和金刚石压腔技术对天然矿物榍石进行原位高压能散模式X射线实验研究，结果表明榍石在3.9 GPa和10.9 GPa分别发生P 21/a→A 2/a和A 2/a→A 1结构相变，并首次确定10.9 GPa→25.1 GPa榍石结构很可能稳定保持A 1相。

The main reason is the uncommensurate contact between nanotube's crystal orientation and diamond's crystal orientation.

碳纳米管在金刚石基底以及氩基底上滑动滑动时，碳纳米管受到的摩擦力产生了明显的跃动现象，我们认为微观状态下，上、下表面间的晶格随着滑移而导致的相对位置变化是产生跃动现象的根本原因。

Diamond bits require lower WOB,high rotary speed and small flow rate,useful for hole straightening and inclining prevention,and it can be used high-density drilling fluids.But diamond bits can′t effectively drill heterogeneous hard formations which contain chert,pyrite and silicastone.

金刚石钻头的钻压小、转速高、排量小，有利于纠斜防斜，可在高密度钻井液条件下使用，但它不能有效地钻进含燧石、黄铁矿和硅质的不均质坚硬地层。

This factory is specially producing artificial diamonds and cubic boron nitrid products.

本厂是一家人造金刚石、立方氮化硼制品的专业生产厂，位于中国最大的工业城市上海——宝钢。

It is stressed introducing development and application of SPS in preparing functionally gradient material, thermoelectricity material, ferroelectric material, magnetism material, composite, noncrystal alloy, shape memory alloy, diamond and nanometer material etc.

重点介绍了SPS在制备功能梯度材料、热电材料、铁电材料、磁性材料、复合材料、非晶合金、形状记忆合金、金刚石和纳米材料等领域的应用情况和进展。

There was almost no heat damage in the brazed diamond.

金刚石在焊接过程的高温下没有发生石墨化。

The characteristics and advantages of monolayer brazed superabrasive tools are introduced.

介绍了单层钎焊超硬磨料工具的特点及优势，综述了国内外钎焊金刚石和立方氮化硼工具的研究现状和研究成果。

But there are many problems in the process of making brazing diamond film tools.

但在金刚石厚膜钎焊刀具的加工过程中，还存在许多问题。

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％。