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diffusion fluxes
相关语句
  扩散通量
     The findings have revealed that ammonium, nitrite, nitrate and dissolved phosphorus diffusion fluxes across sediment water interface were from -0.024~0.99? -0.39~-0.001 9? -3.09~-0.12 and -0.48~0.12 μg/(cm 2·d) respectively, and that the sediment in tidal flats was the source of phosphorus and an important sink for nitrogen in the waters.
     计算表明 ,沉积物 水界面间NH4 + N、NO2 - N、NO3- N和DP的扩散通量分布范围分别在 - 0 .0 2 4~ 0 .99、- 0 .39~ 0 .0 0 19、- 3 .0 9~ - 0 .12和 - 0 .48~ 0 .12 μg/ (cm2 ·d)之间。
短句来源
     Moreover, the diffusion fluxes of NH 4 -N, NO 3 -N and NO 2 -N between water and intertidal sediment interface were estimated, indicating that NH 4 -N in sediments may play an important role in the Yangtze estuarine and coastal environment.
     初步探讨了潮滩水和沉积物中无机氮分布季节性变化的主要影响因素,估算了潮滩表层沉积物-水界面无机氮的扩散通量,指出NH4-N的扩散释放对滨岸水环境质量影响较大。
短句来源
     Nitrogen and phosphorus diffusion fluxes across sediment-water interface in estuarine and coastal tidal flats
     河口滨岸潮滩沉积物-水界面N、P的扩散通量
短句来源
     This may be caused by 2 reasons, 1. HPO42- produced by decomposition of organic matter was rapidly transferred from liquid to solid phase. 2. the organic matter in sediment was induced by pollutant source. The mean diffusion fluxes from sediments to overlying seawater were cvaluatdd to be (μ mol/m2·month): Pb(Ⅱ).
     HPO_4~2有所增加,其含量小于6μmol/l,表明有机物分解产生的可溶性磷酸盐迅速转移到固相,本文中还估算了下列物质从沉积物到上覆水的扩散通量(μmol/m~2·month),结果得,Pb(Ⅱ):2.6、Cd(Ⅱ);
短句来源
     In this study the main form of the nitrogen that diffused from sediment into overly water was ammonia,and the submerged plant(decreased) the diffusion fluxes of ammonia and nitrate at water-sediment interface.
     总之,水-沉积物界面氨氮是沉积物向上覆水扩散的主要氮组分,沉水植物降低了氨氮和硝态氮的扩散通量.
短句来源
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  “diffusion fluxes”译为未确定词的双语例句
     Though the rates of the three typical dissipation of energy, Φ_i, are the composition part of Tσ, but the common relation of the entropy production and the total dissipation rate of energy Φ is not Tσ=Φ but T(σ-w)=Φ, in which the is the power of the volume forces on the diffusion fluxes (and not any mechanical-power) in unit volume.
     结果表明,三种形式的能耗散率Φ_1虽都是Tσ的分量,但总能耗散率Φ与Tσ的普遍关系不是Tσ=Φ而是T(σ-w)=Φ,其中Tw=是单位体积内的体积力对扩散流的功率(而不是一般的功率)。
短句来源
     The diffusion fluxes ofNO3-N and SiO3-Si from interstitial water to overlying water were calculated, being0. 033 and 0. 019 mmol/m2 d, respectively.
     估算了NO2-N和SiO3-Si从间隙水向上覆水扩散的通量分别为0.033和0.019mmol/m2·d。
短句来源
     The estimated conclusions showed that the diffusion fluxes of P and Si from sediment to seawater were 10.2×10 6 and 190.6×10 6 kg/a, accounting for 86.4% and 31.7% of the total cycling P and Si, respectively.
     计算结果表明 ,渤海每年沉积物向海水提供的磷、硅分别为10.2×106 和190.6×106 kg,分别占渤海磷、硅循环总量的86.4 %和31.7 %。
短句来源
     -2 valence sulfur and sulfate of lagoon and off-reef sediment interstitial waters of Nansha Islands, South China Sea, were studied for the first time in May,1993 and in March and April, 1994 by using exploration, including distribution characte ristics of - 2 valence sulfur ofinterstitial waters in lagoon and off- reef sediments, diffusion fluxes across sediment-water interfaee and thermodynndc equilibrium system of -2 valence sulfur.
     于1993年5月和1994年3-4月通过调查,用硫离子选择电极法研究南沙群岛海域泻湖及礁外沉积物间隙水中的∑S(-Ⅱ)及SO~(2-)_4,探讨泻湖内及礁外间隙水中-2价硫的分布特征,沉积物-海水界面间硫的扩散转移通量和-2价硫的热力学平衡控制体系。
短句来源
     Traditional theory of chemical diffusion in solid states can not describe the relation of diffusion fluxes and diffusion-induced stresses because the research subject of the traditional theory is the diffusing atom or atomic flux, not the volume unit in the interdiffusion field.
     传统固体化学扩散理论的研究对象是扩散的原子或原子流,并不关心互扩散区域内微观体积单元的变化,因此无法描述原子扩散流与应力之间的关系。
短句来源
  相似匹配句对
     Nonlinear Diffusion
     非线性扩散
短句来源
     PROBLEMS OF THE GRADIENT-DIFFUSION THEORY IN ITS APPLICATION TO THE DETERMINATION OF MASS AND ENERGY FLUXES
     梯度扩散理论在能量和物质输送计算中的若干问题
短句来源
     The difference beween diffusion fluxes of new and aged ponds are discssed in this paper.
     此外,还比较了新、旧虾塘之间的营养盐扩散通量的差异。
短句来源
     NITROGEN DIFFUSION IN STEEL
     钢渗氮扩散规律
短句来源
     Research Into the Series of Mold Fluxes
     模铸保护渣系列研究
短句来源
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  diffusion fluxes
The energy, momentum, and mass transport are diffusion controlled, and the diffusion fluxes of the components are given by the Nernst-Planck formulas.
      
The vacancy wind effect is shown to be an important factor in the consideration of intrinsic diffusion fluxes and their relation to tracer diffusion and thermodynamic information in the vanadium-titanium system.
      
The influence of the softened (due to impurity diffusion fluxes) layer thickness on the creep character in molybdenum is discussed for the case of its diffusion contact with nickel.
      
An analysis of manifestation of the effect of acceleration of creep in polycrystalline metals and alloys in the presence of grain-boundary diffusion fluxes of an impurity from an external medium (coating) is performed.
      
An analysis of special features of manifestation of the creep acceleration effect in polycrystalline metals and alloys in the presence of grain-boundary diffusion fluxes of an impurity from an external medium is made.
      
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The interstitial water chemistry of NH4+, HPO42- in the Xiamen, Bay sediments has been studied. With the organic matter in the anaerobic sediments decomposing, concentration of NH4+ increased rapidly to 2 mmol/12 (the constant of reaction rate KN=4×10-9s-1), while concentration of HPO42-increased to 6 μ mol/l. This may be caused by 2 reasons, 1. HPO42- produced by decomposition of organic matter was rapidly transferred from liquid to solid phase. 2. the organic matter in sediment was induced by pollutant source....

The interstitial water chemistry of NH4+, HPO42- in the Xiamen, Bay sediments has been studied. With the organic matter in the anaerobic sediments decomposing, concentration of NH4+ increased rapidly to 2 mmol/12 (the constant of reaction rate KN=4×10-9s-1), while concentration of HPO42-increased to 6 μ mol/l. This may be caused by 2 reasons, 1. HPO42- produced by decomposition of organic matter was rapidly transferred from liquid to solid phase. 2. the organic matter in sediment was induced by pollutant source. The mean diffusion fluxes from sediments to overlying seawater were cvaluatdd to be (μ mol/m2·month): Pb(Ⅱ). 2.6, Cd(Ⅱ). 0.87、Cu(Ⅱ); 11 、Zn(Ⅱ);20、 NH4+2 2.3×104、HPO42-; 28. Among that, the fluxes in West Xiamen Bay were larger than in Jiulong Estuary.

在厌氧沉积物中,随着有机物的分解,NH_4~+显著增加,其反应速率常数K_N=4×10~(-9)S~(-1);HPO_4~2有所增加,其含量小于6μmol/l,表明有机物分解产生的可溶性磷酸盐迅速转移到固相,本文中还估算了下列物质从沉积物到上覆水的扩散通量(μmol/m~2·month),结果得,Pb(Ⅱ):2.6、Cd(Ⅱ);0.87、Cu(Ⅰ):11、Zn(Ⅱ):20、NH_4~-;2.3×10~4、HPO_4~(2-):28.其中厦门西港的通量大于九龙江口。

This paper deals with the redox process and chemical diagenesis of iron and manganese in sediment interstitial waters of Liaodong Bay, Bohai Sea. Eight cores from this Bay were obtained in June and July 1988. The concentrations of Fe2+, Mn2+ and SO2-4 in interstitial waters and the parameters of sediments such as pH, Eh and Es*, were determined. The main results are as follows:1.Horizontal distributions of Fe2+ and Mn2+ appear to decrease and increase with the raising of latitude. The interstitial waters are...

This paper deals with the redox process and chemical diagenesis of iron and manganese in sediment interstitial waters of Liaodong Bay, Bohai Sea. Eight cores from this Bay were obtained in June and July 1988. The concentrations of Fe2+, Mn2+ and SO2-4 in interstitial waters and the parameters of sediments such as pH, Eh and Es*, were determined. The main results are as follows:1.Horizontal distributions of Fe2+ and Mn2+ appear to decrease and increase with the raising of latitude. The interstitial waters are apprently richer in Mn2+ than the overlying seawater. The preliminary result indicates that concentrations of Mn2+ are effected by the redox potential of sediment, but those of Fe2+ are not. The vertical profiles of Fe2+ show that there is a maximum of Fe2+ concentrations in 5-25cm depth of cores, but the maximum of Mn2+ concentrations is found on the interface of sediment-water. This demonstrates that the addition and removal of Fe2+ and Mn2+ in interstitial waters are different.2. From the concentration gradients of iron and manganese in interstitial water within the near-surface zone, the diffusion fluxes across the sediment-seawater interface were calculated by means of the Fick's first law modified for sediment. Fe2+ and Mn2+ are provided from sediment to overlying water. The fluxes of Fe2+ and Mn2+ are 62.6μg/(m2·d) and 994.3μg/(m2·d), respectively.3. Fe2+ vs. Mn2+ and Mn2+ vs. SO2-4 vary in positive correlation, but Fe2+ vs. SO2-4 and ∑ vs. Fe2+ in negative correlation. The studies on chemical diagenesis show that the reactions of Fe(Ⅱ,L) + S2-2→FeS2(s) and Mn(Ⅳ,s)→Mn(Ⅱ,L) are the controlling reactions of Fe2+ and Mn2+ in interstitial waters of Liaodong Bay.4. A simple model is proposed to describe the mass transfer of iron and manganese in the zone of redox boundary. The shapes of concentration-depth profiles of Fe2+ and Mn2+ in interstitial waters of Liaodong Bay are discussed in terms of the model modified. The shapes of vertical profiles of Fe2+ and Mn2+ are resulted from the comprehensive consequences of different rates of redox, diffusion and distinct controlling systems.

于1988年6—7月在辽东湾进行了调查,对其沉积物间隙水中Fe~(2+),Mn~(2+)及有关参数的测定结果及相关分析表明,铁、锰平面与垂直分布类型的不同是由于Fe~(2+),Mn~(2+)氧化还原速率、扩散速度及控制体系不同的综合结果,得出Fe(Ⅱ,L)+S_2~(2-)→FeS_2(s)和Mn(Ⅳ,s)→Mn(Ⅱ,L)是控制辽东湾间隙水中Fe~(2+),Mn~(2+)浓度的主要体系,并用氧化还原界面层的一种简单模式讨论了铁、锰转移与其浓度-深度分布形状的关系。本文还应用Fick第一定律直接计算了沉积物-海水界面间铁、锰扩散转移通量。

During the First Chinese Antarctic Ocen Exploration from December 1984 to February 1985, 27 grab samples and 2 box samples were obtained. With tracing to the diagenetic distribution of iodine, some records relative to the reversible processes of early diagenesis and biogeochemis-try of iodine are obtained in this paper. The distribution of iodine depends on biogenic materials, and thus the regeneration of bioiodine mainly occurs in early diagenesis. Furthermore, its regeneration process is closely correlated...

During the First Chinese Antarctic Ocen Exploration from December 1984 to February 1985, 27 grab samples and 2 box samples were obtained. With tracing to the diagenetic distribution of iodine, some records relative to the reversible processes of early diagenesis and biogeochemis-try of iodine are obtained in this paper. The distribution of iodine depends on biogenic materials, and thus the regeneration of bioiodine mainly occurs in early diagenesis. Furthermore, its regeneration process is closely correlated with the release of sedimentary organic nitrogen. The decrease of iodine contents can be down to 50% (Ml) and 36% (R2) within the depth of the two twenty centimeter sediment cores. The estimated rate of iodine regeneration is 2.3×10-2μg/(g·a) in average (Ml). Linearity of iodine contents vs. buried time suggested the zero order dynamic equation which reveals the diffusion and release process of bioiodine in the regeneration during early diagenesis:I-= 180 + 21T(M1), I-= 142 + 28T(R2)The diffusion fluxes of iodine returned to the aquatic biogeochemical system are: FM1 = 5.8×10-7μg/(cm2·s), FR2 = 8.3×10-7μg/(cm2·s)It shows potential significant effects of pH, carbonate balance and redox conditions on the regeneration release of bioiodine; both basic or reductive condition will facilitated the release of iodine from sediments in early diageuetic environment.

于1984—1985年南极夏季(12—2月),对南极半岛西部海域进行了多学科综合考察,获得27个表层(抓斗)沉积物和两个剖面样(箱式)的地球化学资料。从测区碘的成岩分布中,我们追索到某些与碘的早期成岩和生物地球化学有关的双向过程记录。碘的含量分布依赖于生源物质,生源碘的再生产主要发生在成岩早期,其再生产过程与沉积有机氮的释放密切相关。测区两个剖面样20cm以浅,碘含量降低幅度可达50%(M1)和36%(R2),M1站的平均再生产速率估算为2.3×10~(-2)μg/(g·a)。间隙水碘含量对埋藏时间作图的表观直线性,提出了上述沉积剖面早期成岩生源碘再生产中扩散释放的零级动力学方程: I~-=180+21T(M1),I~-=142+28T(R2)它们回归海水生物地球化学循环体系的通量分别为: F_(M1)=-5.8×10~(-7)μg/(cm~2·s),F_(R2)=-8.3×10~(-7)μg/(cm~2·s)早期成岩环境的酸碱度、碳酸盐平衡体系和氧化还原条件对生源碘的再生产释放有较大影响,碱性和还原条件有利于碘的释放。

 
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