查询词典 atomic density

Alpha decay commonly occurs in elements with atomic numbers greater than 83, but can occur in some rare-earth elements in the atomic-number range of 60 to 71.

发射α粒子的主要是重于铋(lutetium，原子序数83)和从钕(neodymium，原子序数60)到镏(Iutetium，原子序数71)的稀土元素，α衰变的半衰期，从1微秒(10-6秒)到约1017秒。

The frontier orbital energies and total atomic charges of the optimized and active Huperzine A molecules showed that the electron transfer should have happened from the active site of enzyme to Huperzine A in the complex, the changes of the energies, atomic charges, bond lengths and the Mullicken Bonding Population revealed the strong interaction between Huperzine A and enzyme.

石杉碱甲分子的能量以及键长、键级的变化都表明酶和底物之间有较强烈的结合作用。

The relation of the chromatographic retention indices of alkene to topological index,double bond atomic hybridization state index,polarizability effect index of branched chain to double bond atomic,immobile liquid polarity values and column temperatureat different temperatures on different stationary phases was studied.

通过对部分烯烃在不同固定相不同柱温下的1031个样本集的气相色谱保留指数值与其部分参数关系的研究，发现RI与拓扑指数、双键原子杂化状态指数、支链对双键的极化效应指数、固定液极性值及柱温的关系可表示为：^RI=-58.138+57.7460Q-8.2591Q+0.120T+0.807CP+36.460PBD+7.919DHSI(R=0.9989)继以留一法(Leave-one-out，LOO)进行交互检验，相关系数RCV=0.9977，说明所建模型具有良好的稳定性和预测能力，较好地揭示了烯烃类化合物气相色谱保留指数RI随固定相极性、柱温的改变而变化的规律

Based on the theoretical calculation model for the structural information of metal melt, the main structural information, including relative concentration of active atoms, average diameter of the atomic clusters and the number of short-range atoms inside them, was achieved. Finally, by multiple non-linear fitting of experimental data, the function about viscosity and size of atomic clusters was established.

利用金属熔体结构信息的理论计算模型，得到该温度区间内铝熔体的主要结构信息，包括激活原子的相对浓度、原子集团的平均直径及其内部包含近程原子数等，最终通过实验数据的多次非线性拟合发现黏度与原子集团的尺寸之间存在函数关系。

The students can't catch on the essence of the relationship between the atomic structure and the element properties, and they often mistake the element's properties for the atomic's.

对"原子结构与元素性质的关系"存在着各种糊涂的认识，往往将单质的性质误认为是元素的性质。

With the development of science and technology, sensitive, rapid, reproducible, simple and accurate analytical methods are required for the determination of trace elements in geological, biological and environmental samples. The direct determination of extremely low concentration of trace element with modern atomic spectroscopic method, such as atomic absorption spectrometry is so difficult. On one hand, the limitations are associated not only with the insufficient sensitivity of these techniques but also with matrix interference.

随着科学技术技术的发展，在进行地质、环境、生物等样品中痕量金属元素的测定时，常常要求达到ppb级的水平，虽然火焰原子吸收分光光度法具有很高的灵敏度，但是要直接测定这些样品中的痕量组分却很难，这是因为，一方面，样品本身的物理化学状态有的不适合直接测定，或组分的含量低于分析方法的灵敏度；另一方面是存在基体干扰。

The filled skutterudite compound possesses bcc structure as evidenced by electron diffraction analysis. Powder X-ray diffraction data of filled skutterudite samples were characterized by Rietveld method for some crystallographic parameters such as lattice constant, atomic occupation, atomic position, etc.

另外，通过对化合物电子衍射的分析证实了〓化合物是一种具有bcc结构的化合物；运用Rietveld方法对填充skutterudite化合物X衍射谱线进行了分析，对化合物的晶格常数、原子位置的占有率以及原子位置坐标等晶体学参数进行了表征。

Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

原子数 ：每种化学元素的固有数字，等于原子中的质子数。

The study of HCI is interested in astrophysics, quantumchromo dynamics, hyperfine atomic structure and measurement of atomic mass.

高电荷态离子的研究对天体物理、量子色动力学、原子的精细结构和原子质量测量等研究领域都有着重要的意义。

At present,the sample pre-processing methods mainly include wet digestion,dry digestion and microwave digestion and so on;and the determination methods mainly include inductively coupled plasma mass spectrometry,atomic absorption spectrometry and atomic fluorescence spectrometry,etc..

目前常用的样品前处理方法主要有湿法消解、干法消解和微波消解法等；常用的测定方法主要有电感耦合等离子体质谱法、原子吸收光谱法、原子荧光光谱法等。

After explaining total design of automated test system for microcircuit , the thesis introduces GPIB standard .

文章在说明了微电路模块自动测试系统的总体设计后，对GPIB标准进行了介绍。

He interceded in my behalf.

他替我说情。