Gets or sets a value in the collection by numerical index.
按照数字索引获取或设置集合中的值。
Engineering Data, Installation Instructions, Numerical Index.
工程技术参数，安装说明，型号索引。
Gets an item from the collection by specifying its numerical index.
借由指定项目的数值索引从集合中取得项目。
So, given a sequence named a, you can access elements using a numerical index like a [0] or a slice like a [1:5].
所以，给定一个名为a的序列，就可以使用数字索引(比如a[0])或片段(比如a[1：5])来访问元素。
The main innovative points of this thesis are as follows: (1) a new numerical index to score the image scrambling extent is presented.
本文的主要创新性工作为：(1)提出了一种新的衡量图像置乱程度的数值指标。
A Ruby hash (or associative array) is a data structure that allows you to define the key for storage (instead of a simple numerical index).
Ruby散列表(或关联数组)是一种数据结构，允许您定义用于存储的键(而不是简单的数值索引)。
When parsing the input string into its numerical constituents, we use the hash % idx_for_mon, which holds the numerical index of each month (1.. 12) given its acronym.
当将输入的字符串解析为数字时，我们使用的是哈希表(hash) % idx_for_mon，它保持了每个月份(1. .12)给定缩写的数字索引。
Experimental results show that the proposed numerical index suits the intuitionistic vision effects perfectly. (2) a new image scrambling method based on BP neural networks is presented.
仿真实验表明：该数值指标能较好地与人的直观视觉效果相适应。(2)提出了一种基于BP神经网络的图像置乱新方法。
The experimental result show that the scheme which utilized index scheme in moistening coefficient is more suitable for mesoscale numerical simulation of Yunnan low latitude plateau.
数值试验结果表明，增湿系数采用指数型定义法方案较为适合云南低纬高原上的中尺度数值模式。
On review of the theories of wave-mean flow interaction and non acceleration, theorem, and the corresponding numerical analyses, the dynamical mechanism of variation of westerly index is discussed.
通过波流相互作用和无加速定理的讨论以及相应的数值分析，本文介绍有关纬向平均西风变化的近期研究成果。
Transmission parameters such as numerical aperture and normalized frequency of the fabricated holey fibers have been measured and compared with theoretical values based on effective index method.
测量了拉制成的有孔光纤的数值孔径和归一化频率等传输参数，并基于有效折射率方法与理论值进行了比较。
The rational perforation degree and the corresponding development index of the reservoir with different energy were studied by numerical simulation.
利用数值模拟方法，研究了不同能量的底水油藏对应的合理射开程度以及在该射开程度下的开发指标。
An efficient numerical method for the optical fiber with an arbitrary index distribution is given in this paper.
本文讨论了一种任意折射率分布光纤的有效的数值分析方法。
The results showed that the quantitative analysis of computer is helpful for quick measuring index of pollen's shapes, this is effective method for numerical taxonomy of pollen.
结果表明：花粉计算机量化分析有助于快速定量测定有关花粉形态指标，是花粉数量分类的一种有效方法。
In the final, the walking machine's optimal mechanism and walking parameters are obtained through numerical analysis by using this index.
最后应用这个动力学性能指标对空间多关节六足步行机的机构参数进行了优化。
A numerical model of atmospheric optical refractive index structure parameter is presented.
提出了一种大气光学折射率结构常数的数值模式。
The numerical control index head was adopted, so the milling machine can process the machine parts as the gear, the worm gear, with the digital loop control method, it has high processing precision.
配上数控分度头可以加工齿轮、蜗轮等复杂机械零件，同时应用数字化全闭环控制方法，使其具有很高的加工精度。
This paper presents a numerical model of atmospheric optical refractive index structure parameter.
提出了一种大气光学折射率结构常数的数值模式。
The system can also be applied to measurement of numerical aperture of polymer optic fiber and characterization of the refractory index distribution.
该系统也可实现聚合物光纤数值孔径的测量和折射率分布的表征等。
This paper discusses theoretical models and numerical experiments of waveform relaxation methods for solving nonlinear differential-algebraic systems of index-3.
本文探讨非线性指标- 3微分-代数系统的波形松弛算法所涉及的理论模型和具体算例的求解。
A numerical dam hazard potential index may be developed for purpose of comparison.
可以采用一个大坝风险指数来比较大坝潜在风险。
Numerical calculations have been made for wave-guides with a core of rectangular cross-section embedded in a uniform surround of lower refractive index.
对于掩埋在较低折射率的均匀介质中的距形截面芯子的波导曾作过数值计算。
The proposed index system and method are applied to a practical urban network construction project of a supply company, and numerical results verify the correctness and validity of them.
最后，运用本文所建立的指标体系和所提出的方法，对某地方供电公司某一期实际城网建设与改造项目的经济效益进行了实例分析。
Resolve dispersion equation and obtain the effective refractive index of cladding using method of numerical calculation.
推导出纤芯、包层、薄膜层、环境层的场分布表达式，利用数值计算求出了包层膜的有效折射率。
The paper studies non-iterative bidirectional beam propagation method based on scattering operators which is used in numerical analysis of optical waveguide with abrupt longitudinal refractive index.
本文主要研究了基于散射算子的非迭代双向光束传输法数值分析纵向折射率有突变光波导的稳定性和精度等问题。
The paper first studies beam propagation method which is used in numerical analysis of one-way process of an optical waveguide with continuous longitudinal refractive index.
本文首先研究了光束传输法数值分析纵向折射率连续变化光波导的单向光波传输过程。
We considered intensity distribution of light focused by a high numerical aperture lens without spherical aberration through a planar interface between materials of mismatch refractive index.
采用光的矢量衍射理论 ，研究了场振幅为高斯分布的平面波入射到无球差高数值孔径物镜上 ，折射率失配对共焦显微术的影响 ，并进行数值模拟。
The graded-index optical waveguide mode equation is strictly derived. We get an analytical equation and provide a method of numerical calculation.
本文对渐变型波导的模方程，进行严格的推导，得到解析表达式，从而给出了数值求解的方法。
Joined to the numerical control index head to be allowed to process the machine parts as the gear, the worm gear, and so on, also has the higher processing precision.
配上数控分度头可以加工齿轮、蜗轮等机械零件，且有较高的加工精度。
The numerical calculating method of refractive index profile in optical waveguides is discussed.
介绍了光波导折射率分布的数值计算法。
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