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分子扩散
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  molecular diffusion
    Through theoretical derivation and experimental analysis,the reaeration theory of molecular diffusion is checked;
    通过理论推导和实验分析,对水体静态条件下大气复氧的分子扩散理论进行检验,证明DonaldJ.
短句来源
    The methane emission from soil to the atmosphere is mostly through rice plants, only small amounts of methane is released across the water-air interface via bobbles or molecular diffusion.
    后者主要是通过水稻植株向大气释放,只有少量通过气泡或分子扩散从水田土壤通过田面水层向大气排放。
短句来源
    A new detection tube for formaldehyde gas based on passive sampling has been developed according to the principle of the gas molecular diffusion and chemical adsorption.
    新研制的甲醛被动式检气管是建立在气体分子扩散和化学吸收原理基础上的。
短句来源
    A detection tube for mercury gas based on passive sampling has been producted according to the principle of gas molecular diffusion and chemical adsorption.
    初步研制的汞蒸汽被动式检气管是建立在气体分子扩散和化学吸收原理基础上的。
短句来源
    Presently, passive HTO samplers are being widely used abroad. It samples HTO in air based on the principle of gas molecular diffusion and permeation.
    目前被动式氚取样器在国外取得了广泛的应用 ,它是基于气体分子扩散或渗透原理采集空气中氚化水蒸汽 ( HTO)样品的一种方法。
短句来源
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  molecule diffusion
    The nitrogen oxide in the atmosphere can be collected by the principle of the molecule diffusion and then measured by use of the spectrophotometer.
    本方法利用分子扩散原理捕集大气中的氮氧化物 ,然后用分光光度方法测定。
短句来源
  “分子扩散”译为未确定词的双语例句
    The transport mechanisms of the contaminants are convection, dispersion, diffusion and adsorption.
    污染物在粘土中的迁移机理主要包括对流、机械弥散、分子扩散和吸附等。
短句来源
    This paper deals with the rate of mass transfer from an aerosol particle Suspended in a simple shearflow of small Peclet number, which provides a measure of the ratio of the convection to diffusion and isequal to the product of the Reynolds number and the Schmidt number.
    本文研究了低Peclet数下剪切流中气溶胶粒子的传质率。 Peclet数(Pe)是物质浓度的对流输送项对分子扩散项的比。
短句来源
    passive detecting tube for the detectionof formaldehyde gas has been developed baeadon the principle of the gas molecular diffusionand chemical absorption.
    在气体分子扩散和化学吸收的原理基础上,研制了一种测量甲醛气体含量的被动式检气管。 检气管内的惰性担体上浸渍了酚酞亚硫酸钠溶液,遇甲醛后显色。
短句来源
    In this thesis introbuce the result of applying molecule diffuse sampling instrument to monitor and invest the pollution level nitrogen dioxide of ambient air in Shenyang.
    文中介绍了应用自制分子扩散采样器 ,对沈阳市环境空气中二氧化氮污染水平进行监测调查的结果
短句来源
    The diffusion of nutrients in tidal flat area in Yalujiang estuary was from pore water into overlying water.
    由分子扩散公式计算结果表明 ,鸭绿江口潮滩区营养盐均由沉积物向上覆水扩散
短句来源
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  molecular diffusion
Galerkin method for completely compressible displacement with molecular diffusion and dispersion
      
In this paper, the numerical approximation by Galerkin method for completely compressible miscible displacement with molecular diffusion and dispersion in porous media is considered.
      
The experimental water diffusion coefficient during Ostwald ripening in emulsions is 40 times smaller than the calculated molecular diffusion coefficient.
      
Experimental determination of the amount of accelerated molecular diffusion in the turbulent mixing of coflowing supersonic stre
      
Of the greatest interest is the sharp slowing of the approach due to the hydrodynamic interaction of the drops, considerably sharper than in the case of molecular diffusion [2].
      
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  molecule diffusion
The molecule diffusion time was related to the surface/volume ratio of the capsule even for the capsules exhibiting an identical cut-off towards the proteins and the dextran molecules.
      
Observed ΔV?s are explainable on the basis of the reptation mode of the chain molecule diffusion.
      
After intracarotid mannitol infusion, as expected, the BBB breakdown was immediate and temporary as judged by soluble molecule diffusion.
      
Linearized data for different polymer thicknesses and the attendant internal thermal effects have been generated by using calculated single molecule diffusion values.
      
As found, weight loss in the initial process may be considered as H2O molecule diffusion from a semiinfinite medium.
      
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A movable diaphragm tank for storage of radioactive waste liquor is described. Comparison between movable and nonmovable tanks was made. The diffusion rate of radioactive molecules is slow in the former and its working efficiency is increased to 1.27-2.1 times. The difference is significant (p<0.001) and the correlation is good (r=0.9793-0.9966).

本文依据医用放射性核素种类及特点,提出一种“隔板推移式模型”。有隔板池与无隔板池试验对比结果说明,前者放射性分子扩散速度慢,使用效率提高0.27至1.1倍,两种池有着非常显着差异(P<0.001),相关性好(r=0.9793-0.9966)。

Methane is an important greenhouse gas. According to the estimation of IPCC, the methane emission from rice paddies was about 20% of the total methane e-mission. Studies from China, one of major rice producing countries , showed that the methane emission flux from rice paddies in China varied from 7. 8 to 60mg/m2· h. The methane emission from rice paddies actually consists of two processes, the formation of methane in paddy soils and the release to the atmosphere. Methanogen providing anaerobic condition in...

Methane is an important greenhouse gas. According to the estimation of IPCC, the methane emission from rice paddies was about 20% of the total methane e-mission. Studies from China, one of major rice producing countries , showed that the methane emission flux from rice paddies in China varied from 7. 8 to 60mg/m2· h. The methane emission from rice paddies actually consists of two processes, the formation of methane in paddy soils and the release to the atmosphere. Methanogen providing anaerobic condition in water logged paddy (soil Eh value below -200mv) plays a key role for the methane formation. The methane emission from soil to the atmosphere is mostly through rice plants, only small amounts of methane is released across the water-air interface via bobbles or molecular diffusion. Therefore, the methane formation and emission is mainly a biological process. Some physical and chemical conditions of paddy soil, paddy water and atmo Sphere, such as temperature, pH, flooding period and application of organic manure and chemical fertilizer, greatly influence this process. With the understanding of the mechanism of methane emission from rice paddies, the methane emission rate can be reduced along with a good rice production.

目前的研究结果表明,我国稻田甲烷排放通量大约在7.8—60mg/m~2·h。稻田甲烷的排放包含着甲烷在水田土壤中的生成和从土壤向大气释放这样两个过程。前者是通过土壤中微生物活动分解复杂的有机物质,在渍水还原条件(氧化还原电位低于-200mv)下,由产甲烷菌最后转化形成甲烷;后者主要是通过水稻植株向大气释放,只有少量通过气泡或分子扩散从水田土壤通过田面水层向大气排放。显然,稻田甲烷的生成、排放是一个以生物学过程为中心,并与土壤环境、土表水层和大气环境的一些物理、化学条件密切相关的过程。土壤温度、pH值、水稻品种的生物学特性及稻田的水浆管理、施肥措施等等都会影响稻田甲烷的排放。只有研究并掌握稻田甲烷排放的机理及其影响因素,才能真正做到在争取水稻优质、高产的同时,抑制或减少甲烷的排放。

Procedure for mathematical modeling of conversion, molecular dispersion, turbulent dispersion of pollutants in river water is studied. Mass flux of pollutant in water was analyzed. A number of water quality models were discussed based on physical models constructed by theoretical analysis. Numerical approach can be applied to find the solution of the models. The possible application of these models and the conditions for the employment were evaluated as well. To use the turbulent dispersion models for water...

Procedure for mathematical modeling of conversion, molecular dispersion, turbulent dispersion of pollutants in river water is studied. Mass flux of pollutant in water was analyzed. A number of water quality models were discussed based on physical models constructed by theoretical analysis. Numerical approach can be applied to find the solution of the models. The possible application of these models and the conditions for the employment were evaluated as well. To use the turbulent dispersion models for water pollution study, the consistency, validity,convergency, stability have to be considered. The flow field parameters for data input may include dispersion coefficients, initial settings, and so on.

本文讨论了水流场中平流、分子扩散、湍流扩散、离散作用所引起的扩散物质质量通量的数学解析以及几种水质数学模型的应用条件。

 
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