volume diffusion 中文意思是什麼
volume diffusion
解釋
體積擴散-
Oxygen diffusion transport and electrochemical reaction in the oxygen cathode of direct methanol fuel cell ( dmfc ) have been expressed with the tffa model. model calculation has been carried out to investigate the effects of structural parameters of the dmfc cathode on the electrode performance, which is respectively represented by the curve of cathode overpotential versus current density. much attention has been paid to parameters including the porosity of the reaction layer, the thickness of the thin - film on the flooded - agglomerate, the radius of the flooded - agglomerate, the volume fraction of the flooded - agglomerates in the reaction layer
本文首先運用tffa模型描述直接甲醇燃料電池（ dmfc ）陰極氧氣的傳遞和電化學反應過程，研究了過電位-電流密度曲線受陰極結構參數變化的影響程度，其中著重考慮了以下幾個參數：催化層的孔隙率，浸漬聚集體薄膜的厚度，浸漬聚集體的半徑，浸漬聚集體在催化層中的體積分數。 -
A new finite volume method for two dimensional convection - diffusion problems
二維擴散輸移問題的一種新的有限體積演算法 -
The porous diffusion type silencer is widely used to reduce the air flow noise because of its small volume and high noise attenuating ability. the out case of the silencer plays a very important role in reducing noise. the effect of the hole ' s shape, diameter and the distance between neighboring holes as well as the matchup between the case and the sound absorbing material tube are investigated experimentally. the relation between the out - flow noise and the gas velocity distribution is carefully studied for two different kinds of matchup between the case and the sound absorbing material tube. some useful results are gotten, which may be valuable to the design of the silencer
多孔擴散型消聲器由於其體積小、消聲性能高而廣泛應用到排氣噪聲的降低上，其外殼對消聲器的消聲性能具有重要作用.本文對此類消聲器外殼的孔型、孔徑和孔距以及外殼同消聲材料的配合方面進行了細致的實驗研究，特別對外殼與消聲材料的配合與其排放噪聲以及外部流場之間的關系進行了探討，得到了一些有用的結論，對消聲器性能的提高具有一定指導意義。 -
Then a one - dimensional unsteady incompressible flow with moving pollutant source model was proposed. the continuity equation, momentum equation and convection - diffusion equation were discredited using finite volume scheme. thus a software for predicting the air velocity and pollutant in railway double track tunnels was developed
接著，根據雙線鐵路隧道運營通風的特點，建立了一維不可壓縮非恆定流和流動污染源的物理模型以及山相應的連續性方程、動量方程和對流擴散方程構成的數學模型；在此基礎上，利用數值計算方法，編制了一套雙線鐵路隧道運營通風的數值計算程序。 -
Comparison of the diffusion coefficients calculated by this new model with the present experimental data, including benzene, toluene, ethylbenzene in polystyrene ( ps ) and poly ( methyl methacrylate ) ( pmma ) are performed, calculation results in this study are in good agreement with experimental data, for the correct estimation of the hole - free volume change above and below the glass transition
以芳香族溶劑苯、甲苯、乙苯在玻璃態聚苯乙烯和聚甲基丙烯酸甲酯中的擴散系數為例對模型進行驗證，理論計算結果和實驗值取得良好一致。 -
Combined with the project of reverberation room, some technical problems such as the volume, type, sound absorption, sound insulation and sound diffusion arc introduced
結合混響室建設的工程實例，介紹了混響室設計中有關體積、體形、吸聲、隔聲和聲擴散等方面的技術問題。 -
This feature reflects the physical phenomenon of breaking of waves and development of shock waves. in the fields of fulid dynamics, ( 0. 2. 1 ) is an approximation of small visvosity phenomenon. if viscosity ( or the diffusion term, two derivatives ) are added to ( 0. 2. 1 ), it can be researched in the classical way which say that the solutions become very smooth immediately even for coarse inital data because of the diffusion of viscosity. a natural idea ( method of regularity ) is obtained as follows : solutions of the viscous convection - diffusion pr oblem approachs to the solutions of ( 0. 2. 1 ) when the viscosity goes to zeros. another method is numerical method such as difference methods, finite element method, spectrum method or finite volume method etc. numerical solutions which is constructed from the numerical scheme approximate to the solutions of the hyperbolic con - ervation laws ( 0. 2. 1 ) as the discretation parameter goes to zero. the aim of these two methods is to construct approximate solutions and then to conside the stability of approximate so - lutions ( i, e. the upper bound of approximate solutions in the suitable norms, especally for that independent of the approximate parameters ). using the compactness framework ( such as bv compactness, l1 compactness and compensated compactness etc ) and the fact that the truncation is small, the approximate function consquence approch to a function which is exactly the solutions of ( 0. 2. 1 ) in some sense of definiton
當考慮粘性后，即在數學上反映為（ 0 . 1 . 1 ）中多了擴散項（二階導數項） ，即使很粗糙的初始數據，解在瞬間內變的很光滑，這由於流體的粘性擴散引起，這種對流-擴散問題可用古典的微分方程來研究。自然的想法就是當粘性趨于零時，帶粘性的對流-擴散問題的解在某意義下趨于無粘性問題（ 0 . 1 . 1 ）的解，這就是正則化方法。另一辦法從離散（數值）角度上研究僅有對流項的守恆律（ 0 . 1 . 1 ） ，如構造它的差分格式，甚至更一般的有限體積格式，有限元及譜方法等，從這些格式構造近似解（常表現為分片多項式）來逼近原守恆律的解。 -
A multistep finite volume element scheme along characteristics for nonlinear convection diffusion problems
非線性對流擴散方程沿特徵線的多步有限體積元格式 -
Nonorthogonal hexahedral mesh finite volume difference method for the 3 - d diffusion equation
三維擴散方程非正交六面體網格的有限體積差分法 -
The processes of diffusion of heat and burning in three component continuous media with nonlinear conductivity and volume energy release are described by this system
該方程組描述了一個具有三種連續介質的燃燒過程及熱擴散過程。 -
Al these can increase the nucleation rate, so the tic particles become smaller and disperse more homogeneous, and the volume fraction of tic is increased. when 0. 5wt % rare earth ceo2 is added to melt, the surface tension of melt is decreased and fluidity is enhanced, accordingly it enhances the diffusion rate of ti to c particles during the course of reaction and prompts the formation of tic
加入0 . 5wt的稀土ceo _ 2增大了熔體的表面張力及流動性，從而在反應階段增大ti原子朝c顆粒的擴散速率，促使tic顆粒生成，以及在反應完成後增大tic顆粒朝熔體中擴散的速率，促使tic顆粒的形核。 -
Since the novel m41s mesoporous materials ( particularly mcm - 41 ) was firstly reported by mobil ' s researchers, much attention has been paid to this kind of materials. they have not only larger surface area, uniform pore structure and huge pore volume, which can reduce bottleneck phenomenon in molecular diffusion, but also higher mechanically and chemically stability as new inorganic materials. these materials have been widely used as catalysts, sorbents and separation materials as they were synthesized firstly
介孔材料作為一種新型功能材料，由於其具有較大的比表面積、長程有序的孔道結構、較大的孔容、良好的擴散性能和能夠減小分子擴散中的瓶頸效應等特點，以及作為無機材料所具有的機械和熱穩定性，所以自1992年mobil公司開發研製了以mcm - 41為代表的m41s系列介孔材料以來，被廣泛應用於催化、吸附和分離等領域。 -
The volume of diffusion gas has been calculated with the application for the pick ' s theorem to the local geological features, which proved that the gasfiields formed before tertiary has entirely been destroyed. it is concluded that medium or small gas - pools might be found in the depression. finally, the paper proposes some plays
特別是，以菲克定律為基礎，結合研究區的實際地質條件，嘗試性地通過計算證明，第三紀以前形成的氣藏（一次成烴階段）已被破壞，散失殆盡，二次成烴（第三紀以後）具備形成中?小型氣田的基本地質條件，具有良好的勘探前景。
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