查询词典 spectral density

The spatiotemporal spectral line intensities of the first three atomic lines in Hydrogen Balmer series (λ=656. 28, 486. 13, 434. 05nm) of RF ion source plasma, are measured with calibrated Optical Multichannel Analyzer . Some plasma parameters, including electron temperature, hydrogen atom density and hydrogen ion density, are calculated and analyzed Using Partial Local Thermodynamic Equilibrium theory and Abel transform.

实验采用绝对定标后的光学多道分析系统测定了离子源等离子体不同时间和空间位置的氢原子巴耳末谱线系中前三条谱线（λ=656.28，486.13，434.05nm）的强度，并采用PLTE的理论和Abel变换方法，计算出了高频离子源等离子体的电子温度、氢原子浓度、氢离子浓度等参数在放电的不同阶段和径向分布情况，并进行了简要分析。

Density functional theory has been successfully used to predict the kinetic properties and electronic structure of coumarin and spectral characteristics, and it can effectively reduce the blindness and unnecessary waste in synthesis and application of coumarin.

密度泛函理论已成功用于预测反应动力学特性和香豆素的电子结构和光谱特性，可以有效地减少香豆素合成和应用中的盲目性和不必要的浪费。

In the first session the fans vibration on-line monitoring system is realized with VC language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis.

首先用稳定性强、扩展性好的VC++语言开发了通风机振动在线监测系统，并编写了自功率谱密度函数、互功率谱密度函数、自相关函数和互相关函数等频谱分析函数来进行简单的离线故障诊断。

Where bandwidth-expansion techniques are used the minimum spectral power density consistent with efficient spectrum utilisation shall be employed.

若使用带宽扩展技术，则必须采用符合有效率地使用频谱的最低频谱功率密度。

The algorithm is suitable for the modulation mode that has the symmetry of spectral correlation density.

该算法对谱相关密度谱对称的调制方式均适用。

But the uniform distribution of the spectral energies can be found in the Power Spectrum Density Function of Eurocode 8 code.

而Eurocode 8给出的设计地震动在所关注的频率范围内能量分布比较均匀。

The spectral curve vs invariant mass is becoming wider and the peak is shifted towards the high invariant mass region with the increase of temperature. However, in ultra high temperature or density envi- ronment, the peak is shifted towards lower region and the curve is changed narrower with the increase of temperature. In the invariant mass region M 憕.-?0.4 GeV?.6 Ge1~, the spectral function is enhanced very much. which contributes to the interpretation of dilepton enhancement results in relevant experi

结果显示高温高密强子物质环境对其有非常重要的影响：ρ谱函数在温度或密度不太高时谱函数曲线变宽，并且峰朝不变质量高的方向移动；在极端高温或高密情况下谱函数却变窄，并且峰朝不变质量低的方向移动，在不变质量M～0.4-0.6 GeV区间谱函数有比较明显的增强，这有助于解释双轻子产生的相关实验现象。

The influence of the spectral line intensity in various laser power density and direct electricity field is studied.

研究了激光功率密度和直流电场对各谱线强度的影响，分析了谱线半高全宽与外加电压。

Based on rate equations, by use of a new method, a semiconductor optical amplifier theoretical model is constructed taking carrier density pulsation, spectral hole burning, stimulated emission, free carrier absorption, two-photon absorption and ultrafast nonlinear refraction effects into account.

基于速率方程采用新的推导方法得到了可以用来讨论飞秒量级光脉冲传输特性的半导体光放大器理论模型，该模型同时考虑载流子浓度脉动、光谱烧孔、受激辐射、自由载流子吸收、双光子吸收和超快非线性折射效应。

The effects of hot/dense hadronic environment on the spectral function of p meson is analyzed. It is found that hot/dense environment plays an important role to the spectral function: when the temperature or the density is not too high.

本文基于虚时形式的有限温度场论，分析了热密强作用物质环境对ρ介子性质的影响，计算得到了ρ介子的谱函数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。