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求助中译英一句和英译中3小段（截止于2009年元月9日22：00前）
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求助中译英一句和英译中3小段（截止于2009年元月9日22：00前）。 谢绝软件翻译！！！。 1. （中译英）高弹性的氮化硼纳米管（环）复合材料结构设计及其实验研究 2. （英译中） Carbon nanotubes (CNTs) are a new type of carbon material with very broad prospects because of to their unique structure and excellent physical and chemical properties.【1-4】 In particular, their excellent mechanical properties have aroused widespread interest in the scientific community, and some progress has been made in applying them to toughen materials.【5-13】 The structure of boron nitride nanotubes (BNNTs) is very similar to that of carbon nanotubes. Their B and N atoms have shown hybridized orbitals and form hexagonal planar net structures like graphite. Each B or N atom allows a electron to develop a conjugated bond, where two running electronics on the plane are stemmed from each BN unit. As a result, BNNTs have structures that are similar to CNTs and exhibit many similar physical and chemical properties. In terms of different BNNTs layers, they can also be divided into single-walled tubes and multi-walled tube structures. In particular, BNNTs are made up of atoms of boron and nitrogen that are more oxidation resistant and are expected to have better mechanical and electronic properties than their well-known cousins, carbon nanotubes. Far more resistant to oxidation than CNTs, BNNTs are suited to high-temperature applications in which carbon nanostructures would burn.【14】 They are expected to be semiconducting, with predictable electronic properties independent of tube diameter and number of layers, unlike tubes made of carbon.【15】 Compared with CNTs, BNNTs have shown great advantage in improving mechanical properties at high temperature, thermal stability, oxidation resistance, and so on. Super composite materials prepared with BNNTs, such as superstrength composite materials and great conductive ceramic composite materials, can be subjected to high temperature and other harsh environmental variables, and can be widely used in metallurgical, chemical, aerospace, machinery and other fields. Studies of the electronic structure of BNNTs have been carried out,【16-21】 but reports of their mechanical properties have been few. The compression characteristics of (5, 5) SWBNNTs were studied by Moon and Hwang.【22】 Shen compared the tensile and compressive properties of BN nanotubes and nanopeapods.【23】 In a recent research study, Griebel, Hamaekers and Heber examined the Young’s modulus of (6,m) boron nitride nanotubes with vacancy and functionalization defects.【24】 Similar to the situation when studying CNT composites, to obtain BNNT composites with better mechanical properties, it is necessary to discover an effective form of chemical treatment that achieves the best graft of the functional group in terms of variety, quantity, and location. We have already reported the effects of grafted carboxyl and amine on the elastic properties of single-walled carbon nanotubes (SWCNTs).【25,26】 Based on these works, we further investigate the effects of grafted carboxyl on the elastic moduli of armchair and zigzag SWBNNTs. The results show that the grafting has a greater impact on zigzag SWBNNTs, and the grafted zigzag SWBNNTs have more stable elastic moduli when more grafts are applied. The opposite occurs with the armchair SWBNNTs: there is a smaller grafting effect and greater fluctuations in the moduli as the graft quantity increases. The reasons for this difference are analyzed in terms of the isoline structure of the deformation electron density and bond-length variation of the grafted BNNTs. |
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zap65535
木虫 (著名写手)
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4楼2010-01-09 08:29:04
cam967
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yjhdr(金币+30,VIP+0):好！ 1-9 13:43
yjhdr(金币+30,VIP+0):好！ 1-9 13:43
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1. （中译英）高弹性的氮化硼纳米管（环）复合材料结构设计及其实验研究 Structure Design and Experimental research of BNNTs （nanopeapod?）with High Elasticity 2. （英译中） 碳纳米管由于具有独特的结构和优异的物理化学性能，已经成为一种有着广阔应用前景的新材料。他们优异的机械性能尤其受到科学界的重视，而且在增韧材料方面取得了一定进展。BNNTs结构与碳纳米管很相似。由于N,B原子之间轨道杂化，形成了和石墨烯结构很相似的六角网状平面结构。每个N,B原子都用最外层的一个电子用于构建共轭键，于是，每个N,B单位就能提供两个自由电子。因此，BNNTs的结构与CNT恨相似，并具备许多优异性能。根据BNNTs层数的不同，也可分为单壁和多壁管结构。特别值得一提的是，由于N,B的比C抗氧化性能更好，因此，科学家预测BNNTs的机械性能和电学性能会比CNT更好。因为BNNT是抗氧化性更强，所以可用于高温场合，而在相同条件下CNT则会燃烧。而且，它们都是半导体性的，电学性能可以设计并且不像CNT一样与管子直径和层数有关。 和CNT相比，BNNTs的高温下机械性能，热稳定性，抗氧化性等都更好。 由BNNT制备的超复合材料（如超强复合材料和超导陶瓷复合材料） ，可以在高温以及其他苛刻条件下使用，并且在冶金，化学，宇宙，机械等方面有着广泛的应用前景。 已有报道研究了BNNT的电子结构，但对其机械性能的研究报道不多。Moon等研究了55SWBNNT的压缩特性，Shen等研究了BNNT和BNNP的拉伸和压缩性能.最近的一则报道中，Griedbe等研究了（6，m）BNNT引入功能化缺陷前后的杨氏模量（vacancy是空白的意思，需要参照原文，估计翻得不准确） 和研究CNT复合材料相似，为了使BNNT复合材料机械性能更好，很有必要寻找一种有效的化学方法使官能团在BNNT上接枝的种类，数量，位置达到最佳。我们已经研究了羧基和氨基对SWNT弹性的影响，在此基础上，我们进一步研究了接枝羧基对扶手椅型和锯齿形SWBNN弹性模量的影响。实验结果表明：接枝对锯齿形SWBNN影响更大，而且当接枝密度增大时，它的弹性模量稳定性增加；而扶手椅型的则与此相反：接枝对其影响更小，而且随着接枝密度加大，其弹性模量稳定性降低。为了解释产生这个不同的原因，从形变电子密度等值线（没见过，不知道是啥参数）和接枝键长变化进行了分析。 |
2楼2010-01-08 23:29:42
cam967
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3楼2010-01-08 23:35:37
cam967
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5楼2010-01-09 12:45:38
