硼

By conducting comparative test on two types of slotted screen samples made of the same materials but different processing methods in the lab, it is proved that CBN ceramic cutting method may improve the anticorrosion and antiscale properties of the slotted screen by boronising the surface during cutting.

通过对相同材质、不同加工方法制成的两种割缝筛管试件的室内对比试验，证实了使用高含硼特殊刀具磨削加工的割缝筛管缝隙表面具有很好的防腐和防垢性能。

The experimental results show that: lithium is scatteredly precipitated as natural lithium carbonate in the whole evaporation process, and the highest content of natural lithium carbonate in solid phase is 2.0%, so it is difficult to get the mixed salt with high-grade lithium carbonate; boron is precipitated as borax in the whole evaporation process, and borax is precipitated in large quantity with the highest content of 15.64% in solid phase until the brine is extremely concentrated (CWR≥97.9%) and intergrows closely with typical cold-phase natron; potassium is precipitated as sylvite and aphthitalite in the whole evaporation process with a content from 9.49% to 34.44%.

结果表明：在低温蒸发状态下，锂以天然碳酸锂形式在整个蒸发过程中分散沉淀，固相最高含量仅达2.0%，因此难以获得较高品位的富锂混盐；硼在全蒸发过程中以硼砂形式自然沉淀。当卤水高度浓缩（蒸失率达97.9%以上）时大量析出并与典型冷相矿物泡碱紧密共生，固相中硼砂含量最高可达15.64%；钾以氯化钾和钾芒硝形式沉淀，在蒸发浓缩的全过程中均有不同程度析出，固相含量在9.49%~34.44%之间波动。

In the forth chapter, betulin was oxidized by Jones oxidation in step 1 and converted to betulonic acid, then betulonic acid was reduced by sodium borohydride in step 2 and converted to betulinic acid.

第四章使用琼氏氧化剂氧化白桦酯醇，硼氢化钠还原制得白桦酯酸。

The invention comprises a cyclopalladated catalyst with axial chiral binaphthyl backbone containing phosphine ligand as well as the synthesis thereof, and the application of the catalyst with cyclopalladated catalyst with axial chiral binaphthyl backbone containing phosphine ligand with a similar structure to the hetero atom norbornadiene ring cleavage reaction through an asymmetric catalytic organic boron agent.

本发明包括一类具有轴手性联萘骨架含膦配体的环钯催化剂及其合成，以及其与具有类似结构的轴手性联萘骨架含膦配体的环钯催化剂在不对称催化有机硼试剂对杂原子降冰片二烯开环的应用。

The commodity brands and the preparation methods of boracic lubricating oil additives of the large oil companies in the world were mainly presented.

主要介绍了世界各大石油公司生产含硼润滑油添加剂的商品牌号、合成方法等。

Discussed element of the matrix in alloy of nickel radical high temperature through the experiment, advocate quantity element if the chromium, cobalt, tungsten, molybdenum, Tantalum, niobium, rhenium spectrum to spectral line of boracic ultimate analysis violates a condition, use matrix to match a law to undertake to matrix interference corrective, fixed appropriate analytic spectral line.

通过试验探索了镍基高温合金中基体元素，主量元素如铬、钴、钨、钼、钽、铌、铼等对硼元素分析谱线的光谱干扰情况，采用基体匹配法对基体干扰进行校正，确定了合适的分析谱线。

When boronic acid or boron powder was introduced into silica sol, a β-SiC/B composite powder was obtained by the same method.

在原料中引入硼酸或硼粉后，还获得了不需要任何外加烧结助剂就能致密烧结的β-SiC/B复合粉末，达到了先进水平。

According to molecular design, an inter-molecular-coordination borate eater containing nitrogen as coupling a-gent was synthesized. There are two reactive groups, amino and butoxy in the borate ester molecule.

中文文摘］通过分子结构设计，合成了一种氮-硼内配位结构的硼酸酯偶联剂，解决了硼酸酯水解稳定性差的问题，同时分子结构中含有氨基、丁氧基等活性基团。

By developing the spV tight-binding model, we study the band spectrum feature of the cagelike structure such as carbon clusters, carbon nanotubes, BN nanotubes in this thesis.

本论文发展sp~3s~*紧束缚模型，着重研究笼状纳米结构如碳巴基球、碳纳米管、纳米氮化硼管的能谱特征。

Raman spectra of boron carbonitride nanotubes made by thermal decomposition under different temperatures and with different catalysts were analysized. The intensity ratio of D to G band, I D/I G, increases and then decreases with the increase of the temperature.

引 言 理论计算和实验研究都表明硼碳氮纳米管不但具有比碳纳米管更优异的机械、电学性能和更高的抗氧化能力[1，2 ] ，而且BCN纳米管的机械和电学性能不受其直径的影响，只与其组成有关[3 ] 。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷