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The nitrogen in the coal exists in the forms of pyridine (N-6), pyrrolic and pyridone (N-5), quaternary nitrogen and nitrogen oxides. The N-Q near 401.5eV is assigned to a protonated or oxide form of pyridinic nitrogen. On this basis, the nitrogen in six-membered rings is the dominant in Yibin coal.

研究结果表明，宜宾煤中氮的官能团有4种，即吡啶(N-6)、吡啶(N-5)、质子化吡啶和氮氧化物，其中吡咯含量最大，煤中的N-X就是N-O，是煤中吡啶结构氮与氧直接结合的结果。

Bicyclic compounds containing a phenyl or pyridyl ring fused to a cycloalkyl or heterocyclic ring, to which is attached a 5-membered heterocyclic ring, including pharmaceutically acceptable salts and prodrugs thereof, are agonists of G-protein coupled receptor 40 (GPR40) and are useful as therapeutic compounds, particularly in the treatment of Type 2 diabetes mellitus, and of conditions that are often associated with this disease, including obesity and lipid disorders, such as mixed or diabetic dyslipidemia, hyperlipidemia, hypercholesterolemia, and hypertriglyceridemia.

本发明涉及含有连接在5元杂环上的稠合至环烷基或者杂环的苯基或者吡啶基环的二环化合物，包括其药学上可接受的盐和前药，它们是G蛋白偶联受体40(GPR40)激动剂并且可以用作治疗性化合物，特别是在2型糖尿病和与这些疾病相关的症状中用作治疗性化合物，这些症状包括肥胖病和脂质疾病，比如混合或者糖尿病型血脂异常症、血脂质过多、高胆甾醇血和高甘油三酯血症。

Due to the ring strain and Lewis acid character, silacyclobutanes and silacyclobutenes can undergo ring expansion reactions to afford five- and six-membered silacycles, or ring opening to give organosilicon molecules and materials as well as fulfill organic transformations under very mild conditions.

硅杂环丁烷和硅杂环丁烯由于存在环张力和具有一定的Lewis酸性，能够通过扩环反应生成五元和六元含硅杂环化合物，也能够通过开环反应生成不同结构的有机硅分子和聚合物，抑或实现有机反应在温和条件下的转化。

Multinitroazetidines have been a kind of important new high density energetic materials because of the high strain energy associated with their four-membered ring and can be used constituents of high energy explosive, propellant and gun power.

多硝基氮杂环丁烷因其紧凑张力的四元杂环结构使该类化合物具有很高的能量，从而成为一类重要的高能量密度材料，可作为高能炸药、推进剂和炮用发射药的组成成分。

The characteristic vibrational modes of CBO and CLBO crystals were assigned to planar six-membered ring〓 and tetrahedra BO〓.

在对CBO和CLBO两种晶体的某些特征谱线进行归属时，将〓基团等效为一个〓六元环和BO〓四面体。

Theconclusion is that high excess and the rapid dropping of ethyldiazoacete to the reaction system prefer a five-membered ring product.

其次，我们该变了反应条件，得到了有旋光性的Ⅴ和Ⅵ，同时又作了在铜粉、〓等条件下的反应。

The MS data for protected amino acidsindicated a new rearrangement reaction via five-membered ring intermediate in ESIfragments.

在对模型化合物的质谱研究中，发现保护氨基酸单体的一个新的经由五员环中间体的ESI-MS碎片重排反应。

The reactions of the two-membered Si-O ring with CFn（n=1-3） radicals have been studied by using density functional theory calculations at the UB3LYP/6-31G level.

用密度泛函理论在UB3LYP／6-31G水平上研究了二元硅氧环与CFn（n=1～3）自由基的反应，弄清了微观反应机理，计算了反应的活化能和反应热。

This methodology was demonstrated through the preparation of a 135-membered library of tetra-substituted purines in good yields and high purity.

本文建立的液相平行合成法制备了一个高产率和高纯度的135个化合物的全取代嘌呤库，为构建大体积的全取代嘌呤化合物提供了一种新的方法。

The present method was proved to be a more convenient and effective approach to the N-monodemethylated 12-membered-ring erythromycin derivative.

结论该方法是制备N-去甲基十二元环红霉素衍生物的方便、有效的新途径。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。