行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
利用增量方法和同位素交换技术，对角闪石族矿物的氧同位素分馏进行了理论计算和实验测定。
Oxygen isotope fractionation in amphiboles was determined by theoretical calculation using the increment method and by experimental measurement using isotope exchange technique.
它记录了特定元素的原子包含有多少质子和电子，它使我们能够计算大多数元素最常见的同位素中中子的数目。
It records how many protons and electrons the atoms of a particular element contain. It permits us to calculate the number of neutrons in the most common isotope for most elements.
有了这些从肌肉中反馈的信息，本体才能计算出为了使肌肉保持在相同位置需要多大的松紧度。
With this information feeding back from the muscle, your body can figure out how tight the muscle needs to be in order to keep it in the same place.
内部存储器：根据存储器在计算机中所处的不同位置，可分为内存和外存。
Internal memory: According to its position in a computer, memory can be divided into internal memory and external memory.
本文叙述了放射性同位素源激发能量色散x射线分析中基本参数法的原理、实验装置和计算机程序。
In this paper, the principle, experimental arrangement and computer program of fundamental parameters method in radioisotope source excited energy dispersive X-ray analysis are described.
系统地计算了从轻到重的一系列元素极限温度的同位素分布，并从中抽取出热核的热稳定曲线。
We systematically calculated the isotope distributions of limiting temperatures for a series of nuclei from light to heavy nuclei, and obtain a thermal stability line for hot nuclei.
介绍了红外、超声、高频、激光、同位素、微波、声发射、计算机等近代技术在木材工业上的应用概况。
This paper introduced the application of infrared ray, supersonic wave, high frequency, laser, radioisotope, microwave and acoustic emission technology to wood industry.
求出了丰度方程的近似解，从而计算得到热扩散级联的长度及同位素浓缩产品的丰度。
The solutions of the differential equations are calculated, through which the length of thermal diffusion cascade and the abundance of isotope products are calculated.
本文推导出氧质谱峰高之间的关系和计算氧同位素丰度的公式。
In this paper, formulas for relationship among oxygen mass spectra peak heights and for calculating oxygen isotope abundance are drived.
作为实际应用，本文导出了分离同位素时分离系数的计算公式和用短脉冲的选择性激发同位素必须满足的条件以及激发速率的计算方法。
The article contains the derivations of the formula of separate coefficient, the conditions of the selective optical excitation and the excited rate for isotope separation as an actual application.
进一步，通过有限元数值模拟方法计算了界面不同位置的热循环曲线，进行了不同热输入条件下反应层厚度的预测。
Further, according to thermal cycle calculated by the finite element method, the thickness of reaction layer was predicted in the case of different heat input.
应用猫局灶性脑缺血模型，利用计算机控制的激光多普勒血流计，持续监测猫脑不同位置在脑缺血时的血流变化。
The purpose was to observe the changes of cerebral blood flow at different position using the model of the cats with brain ischemia.
对单粒子能级的计算和分析表明超重核的壳结构是形变和同位旋相关的。
The investigation of single-particle levels shows that the shell structure is deformed and isospin dependent.
研制的TF—A设备是用计算机控制的同位素自动分装系统。
The developed TF-A device is a system for computer controlled automatic split charging of radioisotopes.
在应用单孔同位素示踪原理的基础上，结合地下水渗流井流理论，建立了二维裂隙网络的渗流计算模型。
Based on the principle of isotope tracer in single well, and combing with well-theory of seepage flow, a mathematic model of two-dimension fissure network is proposed in the paper.
用源汇模拟同位素分离气体离心机流场的供取料驱动和机械驱动是离心机流场计算中的方法之一。
The sources and sinks are used to simulate the mechanical drives and the drives of the feed and withdrawals in the simulation of the flow field of a gas centrifuge for isotope separation.
并对不同粒径，在床面不同位置的暴露度、暴露度系数及等效粒径进行了计算。
Calculations of exposure degree, exposure coefficient and equivalent grain size for grains with various size located at different position relative to the riverbed are carried out.
文章按七种不同的车辆模型计算了列车分别以五种不同的速度过桥时桥梁的空间动力响应以及列车在桥上不同位置时车-桥系统的自振频率和振型。
Seven kinds of different vehicle models are used to calculate the space dynamic responses of the bridge on which a train moves at five different speeds.
在计算出的相对同位素丰度与质谱目标峰形状函数之间执行卷积运算，以形成计算的同位素峰集群数据。
Convolution operations are performed between the calculated relative isotope abundances and the mass spectral target peak shape functions to form calculated isotope peak cluster data.
针对多边形之间不同位置关系，给出不同的最近距离和多边形之间彼此面对线段链的计算算法。
Closest distance computation algorithms and chains calculating algorithms have been designed according to different location relationships.
用此方法计算了阵列中不同位置中的天线的辐射情况，与HFSS的结果吻合很好。
Numerical results of the array elements in different positions are compared to those simulated by HFSS, and good agreement is obtained.
对于给定的校准标准计算出相对同位素丰度和相应于该丰度的同位素的实际的质量位置。
Relative isotope abundances and actual mass locations of isotopes corresponding thereto are calculated for the given calibration standard.
图1中阀28A和28B具有在与它们相连的纯化过程中的不同位置得到的样品，可以用计算机控制样品位置。
Valves 28A and 28B in FIG. 1 have samples from various locations in the purification process connected to them and the sample location can be controlled with a computer.
根据实验参数进行了符合效率计算，该实验方法可用于微量气体元素甚至同位素的绝对含量分析，较单独的飞行时间谱更加可靠。
The coincidence efficiency was investigated. This measurement can be used to analyze absolute content of gas atom, even of isotopes. This method is more reliable than the Time-Of-Flight spectra.
根据实验参数进行了符合效率计算，该实验方法可用于微量气体元素甚至同位素的绝对含量分析，较单独的飞行时间谱更加可靠。
The coincidence efficiency was investigated. This measurement can be used to analyze absolute content of gas atom, even of isotopes. This method is more reliable than the Time-Of-Flight spectra.
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