吸收介质

In this work, the equations describing circular Gaussian beams propagating inside absorptive Keer medium have been derived from nonlinear paraxial equation. Based on the equations, an evolution equation of beam waist lias been obtained.

本文从非线性近轴波方程出发，导出了在吸收克尔介质中具有二次位相因子的圆对称高斯光束的传输方程，得到了光束束腰的演化方程。

The invention discloses a method for measuring seawater chemical oxygen demand by photometry, wherein the seawater exemplar is first pre-processed, then using the basic potassium hypermanganate as reaction system, the potassium permanganate is deacidized quantitatively by organics to produce manganate, using pure water or margin solution as reference ratio, measuring the absorbance an of the manganate at its maximum absorbing wave length 430 nm, drafting the A-COD value operating curve, obtaining the concentration of the organics in the water, i.e.

本发明公开了一种对海水化学需氧量进行测定的光度测定法，该方法首先将海水样品进行预处理，再以碱性高锰酸钾为反应体系，这样海水中的有机物在强碱性介质中与过量的高锰酸钾迅速反应，高锰酸钾被有机物定量还原后生成锰酸盐，以纯水或空白溶液作参比，在锰酸盐的最大吸收波长430nm处测其吸光度A，该吸光度A与海水样品中的有机物的含量具有正相关关系。

In this paper, the absorption property of the left-handed material rectangular waveguide was studied by use of the perturbation method, and other novel properties were revealed.

采用微扰法研究了左手介质矩形波导的吸收特性。

It is reported in this paper that diphenylcarbazone reacts with Hg in pH 2.2 in the presence of Tween─60 to form a purple complex with its absorption maximum at 486 nm. The existence of chloride will depress the absorption of the complex. The negative absorption will be proportional to the consistence of chloride.

摘要﹞ 在pH为2.2的酸性介质中，在吐温－60溶液的存在下，Hg与二苯卡巴形成紫色的配合物，其最大吸收波长为486 nm，氯离子的存在可使原紫色配合物吸光度降低，其负吸光度与氯离子浓度成正比。

Thus theoretically, weakly acidic drugs are more readily a orbed from an acid medium than are weak bases.

因此，从理论上讲，弱酸性药物在酸性介质中比弱碱性药物更易吸收。

At last, the improved discrete ordinate method was employed to study radiative transfer in a furnace with the absorbing-scattering media.

最后，本文采用改进的离散坐标法对含吸收散射性介质的炉膛内的辐射传热问题进行了研究。

The institute equipped with 760 sets of all classes of large-scale apparatus, which included computer workstation, large format scanners,large format graphic plotter, X-ray Fluorescence Spectrometer, Inductively Coupled Plasma Atomic Emission Spectrometer, Atomic?Absorption?Spectrometry, powder X-ray diffraction, One-meter Plane-grating Spectrograph, Oscillographic Polarograph, ScanningElectron Microscope, Infrared Spectrometer, Electronic Precision Balance, Sspectrophotometer, semi-industrial ferromagnetic separator,semi-industrial scrubbing machine, semi-industrial continuous dense-medium separation apparatus; semi-industrial continuous gravityconcentrating table equipment and etc.

拥有计算机工作站、大幅面工程扫描仪、大幅面绘图仪、X荧光光谱仪等离子体时序式光电直读光谱仪、原子吸收分光光度计、粉晶X衍射、一米光栅摄谱仪、示波极谱仪、扫描电子显微镜、红外光谱仪、精密电子天平、分光光度计、半工业型强磁选机、半工业型擦洗、半工业型重介质、半工业型重选摇床等设备760 多台。

The effect of the different active medium′s absorption coefficient and distance between the diode and the laser rod on the pump power distribution in the laser rod is studied.

比较了介质的吸收系数和二极管到激光棒距离的不同给抽运的均匀性带来的差异。

But,for the samples with different medium and density, the method should be fitted by self-absorption, and this need further research and study.

但是对于不同介质和密度的样品，该方法还需要进行自吸收修正，有待于进一步研究和探讨。

In order to probe the absorb coefficients of earth medium by the direct wave, reflected wave and transmied wave amplititude which are picked up from the radar wave racords yielded by finite element method,the paper gives out the attenuated radar wave equations in time domain and the attenuated radar wave differential equations while the motion changes simple harmonic with time and electric parametets change slowly with space.

摘 要 为了用有限元方法生成雷波正演记录，从而拾取直达波、反射波、透射波振幅信息，以确定介质吸收系数，文章在时间域给出了雷达波含衰减项的波动方程，及在运动随时间简谐变化以及电性参数随空间缓变的条件含衰减项的雷达波遵循的简化微分方程。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。