查询词典 spectral

Above-water remote sensing reflectance and scattering extinction coefficients of water were derived by modeling radiative transfer across the water-air interface with in situ measured water quality data and beneath water spectral reflectance measurements in Lake Tai.

利用太湖水质参数数据、水面以下实测光谱数据以及水-气界面辐射传输模型，计算得到了水体漫射衰减系数和水面以上遥感反射比，探讨了悬浮物对水体中营养盐以及水下光照等水体环境因子的影响，在此基础上，利用水面以上遥感反射率建立了悬浮物浓度的定量反演模型。

The tested and compared results show that the methods can be used in practice when the reflectance abridgement or spectral image compression is required.

可以看出，删节方法无论是对光谱反射比的删节还是对光谱图像的压缩，其结果都能很好的满足工业需求。

The method of minimizing the Expected Shortfall: the Pflug-Rockafellar-Uryasev method was introduced and was extended to HARA Spectral Measure of Risk M_. Constrained risk-reward optimization is in factshown to coincide with unconstrained minimization of particular spectral measures.

介绍了α-ES最小化的Pflug-Rockafellar-Uryasev方法将其推广至双曲类风险厌恶函数谱测度M_φ约束下的优化问题，证明了经典的马科维茨风险收益问题与对应的无条件限制的谱度量最小化是一致的。

Compared with the arithmetic mean values of the emissivities within 8-14urn IR spectral band,the theoretical formula and its practical uses for calculating the mean value of the emissivity with the mean spectral emissivities are determined in narrow bands.

就8～14μm红外光谱区内利用测得的多个窄波段的平均光谱比辐射率计算该光谱区的平均比辐射率进行了理论分析和实验研究；并与相应的算术平均值进行了比较。

Description of the spectral character of a radiation by the relative spectral distribution of some radiometric quantity radiant flux (power, radiant intensity, etc..

用某一辐射度量的相对光谱分布对一辐射的光谱特性进行的描述。

In order to use IR radiation characteristics for separating targets from decoys this paper obtains their spectral radiant flux first by way of theoretical calculation. This part of the paper makes progress as follows: 1 Spectral radiant flux of three kinds of simple or complex targets and their corresponding decoys can be calculated.

本文针对大气层外目标及其伴飞诱饵的识别问题，主要进行了下面三个方面的工作：一、目标及其诱饵的红外辐射特性的理论计算为了把红外辐射特性用于区分目标和诱饵，首先必须获取它们的红外辐射特性。

This source have the advantages of high stability, high spectral radiant flux, narrow bandpass, large area, tunable wavelength in broad spectral range, etc.

这种新型的积分球光源具有稳定性好、光谱辐通量高、光谱带宽窄、光源面积大、波长在宽波段内可调谐等优点，联合响应度直接溯源于初级辐射标准低温辐射计的标准探测器，可以有效降低定标不确定度。

It is shown that there is a slight difference between the power law power spectral-CDM model and running spectral index-CDM model at lower redshifts.

结果表明，PL-CDM和RSI-CDM宇宙学模型在低红移处有微小差别。

Nevertheless, with the increasing of maximum number of retransmissions, the gain in spectral efficiency decreases, which suggest that enough spectral efficiency gain can be gotten by a desirable delay in practical systems.

但随着最大重传次数的增加频谱利用率的提高越来越小，这就使得实际系统能以较小的时延代价换取足够的频谱利用率增益。

To avoid the shortcoming of magnification change with wavelength, which will cause the spectral image pixel registration error and provide inaccurate relative spectral signal strength in the classical diffractive optic imaging spectrometer, a novel hybrid refraction/diffraction telecentric optical system combining a diffractive lens with an achromatic lens system is presented, and the working principle is then established.

为了克服在传统衍射光学成像光谱仪中，衍射透镜的焦距随波长变化引起系统放大率随波长变化，从而导致光谱图像的像元配准误差，得到并不精确的相对光谱信号强度，提出了将衍射透镜与消色差透镜系统相结合的新型折/衍混合、二组元复合远心成像光学系统的技术方案，具体分析推导了该系统的成像理论。

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％。