变构

The results showed that the yields of coke and dry gas decreased first and then increased ,and olefinic content in gasoline and C 3 olefinicity decreased by 2.0% and 1.2% respectively at the similar heavy oil conversion when the amount of que...

结果表明：在控制相近的重油转化深度下，终止剂用量占处理量 1 %、1 0 %和 1 6%时，焦炭和干气产率均先降低后增加，汽油中烯烃含量和C3 中烯烃质量分数则分别降低 2 。0和 1 。2个百分点，汽油中异正构烷烃比增加，二烯值降低，诱导期增加超过 1 0 0min ；终止剂注入点由提升管中部移至上部而其他条件不变时，汽油中烯烃和C3 中烯烃质量分数分别增加 4.2和 0 。6个百分点

Furthermore, we studied the Raman spectra of the three ground states of Pani during the heating and cooling processes, and their conformation changes were discussed.

此外，我们研究了三种本征态聚苯胺的变温Raman光谱，根据其Raman光谱的变化讨论了其结构和构象的变化。

The results showed that PPC was a thermotropic liquid crystal and displayed the cholesteric banded texture. The reaction conditions had the distinct effects on the propoxy content and liquid crystal property of PPC, with the reaction temperature and content of propionyl chloride increased, the degree of substitution of propoxy increased at the beginning, then trended to steady. The transition temperature and range of liquid crystalline phase were changed with the DS of propoxy, as the DS of propoxy increased, the melt point decreased, and the liquid crystalline phase transition temperature range of PPC get wider.

结果表明，产物PPC具有明显的热致液晶性能，且呈现出胆甾型液晶的彩色条纹织构；反应条件对产物丙酰基含量和液晶性能有显著影响，随反应温度提高和丙酰氯用量增加，产物丙酰基的取代度先增大，后趋于稳定；其相转变温度和温域随丙酰基取代度改变而相应变化，随丙酰基的取代度增大，产物的熔点降低，液晶温度范围变宽。

RESULTS: Pathological diagnosis: hamartomatous polyp in the recta, but no besides malignant melanoma or blue nevus, suggesting to extend removal and close follow-up.

结果：病理诊断为直肠错构瘤性息肉合并大量黑色素细胞，不除外恶性黑色素瘤或蓝痣基础上恶变，建议扩大切除，密切随诊。

Based on the data of dynamic shear rheometric tests, a constitutive equation was also proposed, which could characterize the dependence of the melt viscosity of PE and its blends on both shear rate and temperature.

此外，在大量mPE和mPE/LDPE共混合金动态剪切流变试验数据的基础上，拟合并推导出能够同时反映PE和mPE/LDPE共混合金熔体粘度对剪切速率和温度依赖性的本构方程，并且通过分析发现，方程中的α值对PE和mPE/LDPE共混合金的熔体粘度的剪切速率依赖性影响较大，α值越大，其熔体粘度对剪切速率越敏感。

We explore the relation between structure and activity , structure and toxicity from electronic structure and three—dimensional conformation in order to provide theoretical foundations for predicting the activity and toxicity of these chemical compounds, researching into mechanism of action and choosing safener.

通过比较四种均三氮苯类除草剂的红外光谱特征吸收的实验值和计算值，并运用规范不变原子轨道法GIAO法在RHF/6-31G水平上计算出西玛津的δ~1H-NMR和δ~(13)C-NMR，与实验值的对比统计分析，结果表明：用RHF/6-31G优化的分子构型最佳，AM1法次之，考虑到优化时间和研究的需要，我们在研究均三氮苯类除草剂分子的结构与活性关系时，为了进行深入、精确的理论研究，采用从头算RHF/6-31G进行优化；而对于此类化合物的结构与毒性的关系研究时，更注重分子的量子化学参数的相对值而非绝对值，因而采用AM1的方法。

The stereochemical structures of two new compounds, 5-(3-chlorophenyl)-2-furfur-aldehyde-N-4-methylphenyloxyacetylhydrazone and 5-(3-chlorophenyl)-2-furfuraldehyde-N-4-nitrophenyloxyacetylhydrazone, were determined by DPFGSE-NOE experiments performed in DMSO-d\-6 at 25 ℃ and variable-temperature ~1H NMR The ~1H chemical shifts of the compounds were completely assigned at 25 ℃ and 90

利用变温实验和DPFGSE NOE实验，确定了 5 (3 氯苯基) 2 呋喃甲醛 N 4 甲基苯氧乙酰腙和5 (3 氯苯基) 2 呋喃甲醛 N 4 硝基苯氧乙酰腙两个新化合物25 ℃时在二甲基亚砜中的空间构型，并对这两个新化合物在 25 ℃和 90 ℃时的质子的化学位移进行了全归属。

The results demonstrate that the platinum adducts influence moderately on tautomeric equilibrium, but do not change the relative stability of tautomers whether in gas phase or in aqueous solution.

结果表明：顺铂的键连引起了互变平衡的变化，但是各互变异构体之间的相对稳定性顺序并没有改变。

Made light by aerating, as with yeast or baking powder; often used as a combining form .

充气使变轻，例如用酵母或发酵粉；常用作构词成分。

The optimized configuration and electronic structures of reactants and products were studied by molecular orbital PM3 method.The reaction enthalpies ...

用半经验的量子化学PM3方法研究了反应物和产物的电子结构，得到了产物的最优构型和电荷键序分布以及反应焓变，讨论了反应中的电子效应和空间效应。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！