查询词典 diamond boron

Nickel-boron alloys form the basis of brazes used to join many nickel-base alloys,especially in aerospace.a eutecytic forms between nickel and nickel boride n and so a nickel boron braze can melt and flow without melting the nickel-base materials to be joined.

镍硼熔合依据镀黄铜过去常常加入许多镍基地合金的形式，特别是以航空航天。a eutecytic形式之间镍和镍硼化物n和镍硼如此镀黄铜可能熔化和流动，无需熔化将被加入的镍基地材料。

Precipitation of boron recovery from brines is essential to the boron resource exploiting.

沉淀法从卤水中提取硼对于硼资源的开发利用具有重要意义。

Results show that when the boron content is 8.3%, the B/CuO delay compositions are misfired, and the burning rates increase with increasing of boron contents from 11 % to 20%.

结果表明：当硼含量为8.3%时，硼／氧化铜延期药不能完全燃烧，出现瞎火；在硼含量为11%~20%范围内，随着硼含量的增加，随硼含量增加，硼／氧化铜延期药的燃速增加。

At present, much attention had been paid to the study of the surfactants with four coordinate boron oxygen heterocycles structure, however, the main work was focused on the synthesis of the surfactants containing boron with short-carbon chain alkyls and their basic properties.

目前研究的方向主要是含四配位硼氧杂环结构的表面活性剂，但都是对一些含短链烷基的合成和基本性质研究，对含长碳链的还极少见文献报道。

Little literature on the aspect of surfactants containing boron with long-carbon chain alkyls had been found.Using diethanolamine, boric acid, hexadecanol as starting materials, after a series of reaction such as vapour phase process bromizating, esterifying, alkylating, a new type of surfactants with boron RNB had been obtained. The structures of the compounds had been identified by elemental analysis, IR and HNMR.

本论文采用二乙醇胺、硼酸、十六醇等为主要原料，经气相法溴化、酯化、烷基化等一系列反应合成了一种新型含硼表面活性剂RNB，并通过元素分析、红外、核磁对其结构进行了确认。

During the fracturing for low pressure and low permeability gas reservoirs, there are some main problems in conventional hydroxypropylguar - organic boron cross-linking system: Firstly, the water-lock damage to low pressure and low permeability gas formations by filter liquor; Secondly, the reason for alkali-sensitive damage in alkali-sensitive reservoirs is that conventional hydroxypropylguar - organic boron cross-linking fracturing fluids were cross-linked under alkaline environment, while the permeability of reservoirs is reduced greatly; Thirdly, the formation pressure is low, and the energy of flow back is not enough, at present, the main measure in oil fields is "injecting with liquid nitrogen", but this technique increased the cost of fracturing, making great troubles in operating, and leaving the liquid nitrogen also is a big problem.

在低压低渗透气藏的压裂改造过程中，常规羟丙基胍胶-有机硼交联压裂液体系存在的主要问题，一是压裂液滤液对低压低渗透气层造成的水锁损害；二是常规羟丙基胍胶-有机硼压裂液是在碱性条件下交联的，对碱敏性储层造成碱敏损害，降低储层渗流能力；三是地层压力低，压裂液返排能量不足，当前各油田采取的措施主要是&液氮伴注&技术，但是&液氮伴注&技术增加了压裂的费用，而且液氮存放也存在较大问题。

Mentions of boron compounds like borax date back millennia. In 1808, within a week and a half of each other, two research efforts, led by the great chemists Sir Humphrey Davy in London and Joseph Louis Gay-Lussac and Louis-Jacques Thénard in Paris, announced that they had isolated boron.

硼的一种化合物硼砂被提及的年代可以追溯到一百万年前。1808年，在间隔一个半星期的时间内，分别由伦敦的Sir Humphrey Davy以及巴黎的Joseph Louis Gay-Lussac和Louis-Jacques Thénard领导的两项研究成果均声称他们分离出了硼单质。

Tested the volatilization of boron through the acid-alkali neutralization titration, analyzed the influencing factor of boron volatilization, the conclusion showed that the moisture content and heating-up time were important factor; observed the phase splitting by the SEM, the conclusion showed that the phase splitting were all connected state.

通过酸碱中和滴定法测定了硼挥发量，分析了影响硼挥发的因数，结果表明含水量和升温速率是影响硼挥发的重要因数；通过扫描电镜观察了玻璃的分相情况，结果表明其分相类型均为连通状分相。

The study focused on boron uptake, distribution and retranslocation in different boron efficiency rape genotypes under pot culture.

在土培条件下，研究了甘蓝型油菜不同硼效率基因型对硼的吸收、分配和运转。

In order to solve the problem of low efficiency and short service life of hot pressed diamond bit when drilling in hard and compact formation, relations between diamond exposure of hot pressed bit and rock abrasiveness were analyzed in this paper. Research on matrix performances of hot-pressed diamond bit was firstly carried out.

针对在硬而致密岩石中钻进时效低的难题，本文分析了碳化钨基热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系，认为钻头的胎体成分及其性能是关键，硬而带脆性的胎体性能有利于全刚石出刃，从而能提高钻进速度。

Who? I never heard of him, Paul said, before asking teammate James Posey if he had heard of him.

赛后，科比说，他一直都是一名非常出色的射手，今天他打得很棒。

When I joined the company, I rotated around the different sections.

我加入这个公司时，轮换过几个不同的部门。