三原子的

The structures derived from bicapped square antiprism in configuration are lower in total energy, while those from triangle prism are less stable.

由三棱柱演变的构型能量居中。带心结构和共边构型带有高配位原子，其总能量较高，是不稳定的结构。

Sythesizing thevalence electron number, electronegativity and atomatic radius of the alloying element, thecharacteristic value may be fixed at 4.223 in Ti alloy, and which may be expressed as4.223=∑N_if_i+0.310△x / x_+0.551 △r / r_Ti

综合合金元素的价电子数、化学负电性和原子半径三个因素，钛合金中ω相形成的特征值可定为4.223，其表达式为 4.223=∑Nf_i+0.310Δx/x_+0.551Δr/r_Ti

Secondly, we discussed the effects of spontaneously induced coherence on the absorption properties of nearly equispaced Ladder-type system and found that EIA can occur due to the effects of spontaneously induced coherence.

然后我们讨论了在近等间隔的阶梯型三能级原子系统中，自发辐射诱导相干对其吸收特性的影响，发现利用自发辐射相干也可产生电磁感应吸收。

The atomic number represents the number of nuclear protons or, in the undisturbed state, the number of extranuclear electrons

使同学们熟悉原子能的用途。这里将讨论原子光谱法的三个领域。

Fast atom bombardment mass spectrometry has been used to analyze the complex triglycerides in oils and fats of juglans mandshurica maxin.

本文利用快原子轰击质谱直接测定山核桃油中未经任何前处理的混合甘油三酸酯，能获得其分子量和碎片结构信息，在GC和GC/MS分析的基础上。

Molecular nanotechnology is an anticipated manufacturing technology that will make it possible to build complex three-dimensional structures to atomic specification using chemical reactions directed by nonbiological machinery.

分子纳米技术是一种前沿的制造技术，它将有可能直接通过无机机制获得化学反应并按照原子规格来构建复杂的三维结构。

A series of tri-block copolymers of styrene/tetradecyl methyl acrylate/3-methacryloxyl-propyl thimethoxyl silane was synthesized by atom transfer radical polymerization. The structures of those copolymers were characterized by means of gel permeation chromatography, infrared spectrum, and nuclear magnetic resonance (1H-NMR). Effect of tri-block copolymers on the mechanical properties of glass fiber/polypropylene composites was also investigated.

采用原子转移自由基聚合法合成了一系列新的三嵌段共聚物大分子偶联剂聚苯乙烯－b-聚甲基丙烯酸十四酯－b-聚3-甲基丙烯酰氧基丙基三甲氧基硅烷，通过凝胶渗透色谱、红外光谱和核磁共振(1H-NMR)证实了其结构，并研究了其对玻璃纤维／聚丙烯复合材料力学性能的影响。

Total synthesis of CET was accomplished by two routes through a conceptually novel strategy featuring a transannular reductive rearrangement as the key transformation for the construction of the core pentacyclic ring skeleton of CET.

我们采用了全新的合成策略，以氮原子参与的跨环还原重排为关键反应，通过两条路线分别成功地合成了三尖杉碱。

As all know, Cu-NiRs have trimeric structures, in their each monomer, there exist two types of Cu centers that play pivotal roles as the components of electron transfer pathway in the process of catalysis.

Cu-NiRs呈三聚体结构，每个单体都含有两种类型的铜原子，它们在酶催化过程中起着传递电子的重要作用。

The fluorescent tuning on and off can be achieved by the stimuli of acid, which will protonate the central nitrogen atom of triphenylamine unit to stop the PIET process.

通过加入酸将三苯胺中心氮原子进行质子化，切断其PIET过程，可实现荧光的淬灭与恢复的可逆性荧光调控。

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％。