光度

This paper is aimed to determine evaluation method of photometric precision and investigate its effect on analytical precision by simulated spectra.

研究了该类型仪器的吸光度重复性的评价方法，并采用模拟光谱法考察了吸光度重复性对测试结果重复性的影响。

Astronomical Photometry is a technique of measuring the amount of light emitted by a celestial object.

天文光度分析学是量度天体光度的一门技巧。

Astronomical Photometry is a technique of measuring the flux of a celestial object.

光度分析学是天文学上量度天体光度的技巧。

Secondly, derived from the theory of colorimetry and radiometry, the basic methods we need in measurement of chroma, radiation and optical medium characteristics have been derived.

然后，从色度学和光度学等科学的角度出发，推导了用于色度、光度以及光学介质特性测量的理论基础。

In this paper,the principle of a new absorbance ratio derivative method was described.The experimental methods of derivation with subtraction technique on ordinary spectrophotometer and simultaneous determination of phenol and resorcin were studied.The result is satisfying.

本文叙述了吸光度比值－导数光谱新方法的原理，研究了在普通分光光度计上用计算法完成吸光度比值导数运算、同时测定苯酚和间苯二酚含量的实验方法，取得了较为满意的结果。

The polymerization characteristics have been examined in detail for the oxazoline-substituted N-phenylmaleimides with initiators including n-BuLi, Et_2Zn, Et_2Zn/-Sparteine, and Et_2Zn/n-BuLi.

发现：在n-BuLi引发下获得的光学活性聚合物最高比旋光度达到-60.0°~(25D，数均分子量为2×10~3～6×10~3；聚合物的比旋光度随着分子量的增大而线性增加，poly出现了旋光方向翻转现象，临界分子量为M_n=2700。

Prospect of catalytic method and other techniques for spectrophotometry is presented.

展望了流动注射催化光度法及其他分析技术对光度法未来的影响。

On one hand, turbulences cause the thermonuclear reaction of the H-burning shell in AGB star to be unstable, and the occurrence of the thermal pulse greatly beforehand, and very frequent.

这种热脉动的提前发生不仅使氦壳层内的光度、产能率、温度发生变化，同时使氢壳层内的各物理号和恒星表面的光度都同步发生改变。

Experimental result showed that under the wavelength of 460 nm,there was good linear relation between absorbency and content of SO42-;and stationary time that absorbency value needed became longer along with the increase of sample quantity of phosphoric acid.When absorbency become stationary,there is good linear relation between the phosphoric acid sample quantity and the content ofSO42-.So the content of SO42- can be adjusted by turning the sample quantity to make it in scope of standard curve.

实验结果表明，在波长为460 nm处，硫酸根含量与吸光度成良好的线性关系；随着磷酸取样量的增加，吸光度达到稳定值所需的时间相应增加，稳定后磷酸取样量与硫酸根含量成良好线性关系，因此实验过程中可通过调整磷酸的取样量来调节硫酸根含量，使之在标准曲线的测定范围内。

The optical activity of a stereoisomer is expressed quantitatively by its optical rotation, The specific rotation 〖α〗D25C of an optically active compound is defined thus

立体异构体的光学活性是以旋光度定量表示的，光学活性物质的比旋光度〖α〗D25C是这样定义的

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。