diffusion velocity 中文意思是什麼
diffusion velocity
解釋
擴散速度-
If the velocity of atoms is near to zero, the light for ces will tend to confine the atoms near to nodes and antinodes. the stability depends on the magnitude of the negative slope of the light force, the depth of the potential well and the momentum diffusion coefficient. it is important to select the parameters, e. g
如果通過激光冷卻能使原子速度降至很小甚至為零，光壓力的作用將使原子被較穩定地囚禁于激光駐波場的節點和反節點處，其穩定程度取決于該處光壓力曲線負斜率的大小、對應勢能的勢阱深度以及動量擴散系數的大小，因此，如何在實驗中合理選擇激光強度、失諧量等顯得尤為關鍵。 -
Using the post processing tools of this cfd software, this article analyses the temperature and velocity field in the vav air - conditioned office and finally evaluates the indoor air distribution, adopting air diffusion performance index ( adpi )
利用cfd軟體的后處理工具對不同送風方式以及不同工況下的變風量空調室內的溫度場和速度場進行了分析，最後採用空氣分佈特性指標對空調室內的氣流組織進行了綜合評價。 -
The distribution of concentration still obeys the diffusion law, only the efftects of the group particle fall velocity and the dispersive force on the diffusion index z1 shall be considered
懸沙濃度分佈仍遵循擴散定律，但擴散指教z1將受到顆粒群體沉速和離散力的影響， -般為y的函數。 -
In this paper, some characteristics of flow movement and sediment transport are analyzed by using the flume experiment data. the cross section of compound channel can be divided into four regions : the undisturbed region in main channel, the interactive region between channel and plain, the undisturbed region in flood plain and the boundary region. in the undisturbed regions, the distribution of longitudinal velocity along the depth has the feature of lograithmic. whereas, in the interactive region, the longitudinal velocity does not obey the logarithmic distribution law, but it can expressed as a revised logarithmic function by using a wake function. on the basis of the kinematic equation the velocity distribution of transverse velocity is obtained. in the boundary region, the longitudinal velocity obeys the law of parabolic distribution. furthermore, according to the simplified diffusion equation, the transverse distribution of sediment concentration in the interactive region is deduced. the analysis is in good agreement with the measured data
本文根據漫灘水流的運動特點，將漫灘水流的復式斷面分為主槽平衡區、灘槽交互區、灘地平衡區及邊壁區等4個區，並給出了各區寬度的經驗公式.根據灘槽交互區垂線流速分佈的變化特點，提出了附加尾流函數的對數流速分佈公式.在簡化水流運動方程和泥沙擴散方程的基礎上，對灘槽交互區內垂線平均流速及含沙量沿橫向分佈進行了理論分析，提出了反映灘槽水流動量交換強度的橫向渦量粘性系數及橫向擴散系數的表達式，得到了漫灘水流垂線平均流速及含沙量沿橫向分佈的解析解，並與實測資料吻合較好 -
In the low - temperature - freezing stage, the water is frozen as ice phase, while the solute precipitate as the salt phase. the velocity of ice phase growth ( vf ) in the solution and the velocity of solute diffusion ( vd ) decide that whether the heavy segregation of solute appears
當低溫冷凍時，水以冰的形式凍結，溶質則以鹽的形式析出，形成冰鹽兩相;冰相生長速率和溶質擴散速率決定了溶質鹽是否發生大的偏聚。 -
The diffusion carrier concentration profile and junction depth were measured and compared with conventional furnace processing diffusion ( cfd ). it presented following conclusions : 1 ) the temperature distribution in quartz chamber of rtd furnace is uniform because square resistance is uniform after rtd ; 2 ) the diffusion velocity of rtd furnace by a factor of three compare to conventional furnace processing diffusion ( rtd ) ; 3 ) if diffusion temperature and doping phosphorus are equivalent, doping phosphorus of rtd are more than of cfd in equivalent distance to the silicon surface
實驗研究了快速熱擴散（ rtd ） ：通過旋塗磷膠和印刷磷漿兩種方式考查了2 4和103 103單晶硅的快速熱擴散特性，發現： 1 ）此樣機的溫度場在空間分佈上是均勻的； 2 ）快速熱擴散可以比傳統擴散快3倍的速度進行擴散； 3 ）在擴散溫度和摻雜磷源相同的條件下，與傳統擴散相比，快速熱擴散將雜質向結更深的地方推進。 -
The effect of thermal conductivity of membrane on the distribution of temperature in the fuel cell is discussed, and the effect of inlet velocity and porosity of porous diffusion layers on the fuel cell performance are analyzed
討論了質子膜的導熱率對電池內溫度分佈的影響。分析了進料速度和多孔擴散層孔隙率對電池性能的影響，結果表明較快的進料速度和較大的擴散層孔隙率都能有效提高電池的性能。 -
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。 -
By control the adulteration of kmno4 powder in the raw materials, we found the adulteration of kmn04 powder decrease the dosage of easy melted metal mn, and release the hot - trap problem, enhance the diffusion velocity as well as cut down the synthesis temperature and combustion propagation velocity of the system
320左右體系內sro _ 2分解放出氧氣，並且和空氣中的co _ 2發生反應生成了srco _ 3發生強烈的放熱反應，緩慢的放熱包。 450左右體系內naclo _ 4分解吸熱， shs反應被觸發，反應劇烈，放出大量的熱。 -
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。 -
In the suspended sediment transport model, the method of shear stress is adopted to determine the source function in the suspended sediment diffusion equation. through a series numerical experiments and statistical analyses of observed field data, a local coefficient, which can reflect the bottom material and consolidation, is introduced into the classic critical erosion velocity of the sediment
懸沙輸運模型利用切應力方法來確定對流擴散方程中的泥沙源函數，其中的臨界起動速度利用經典的泥沙起動流速公式前面增加一個局地系數得到，這個系數能反映河床底質結構及固結程度，通過系列數值試驗和實測資料的統計分析確定。 -
As one of the several models to improve the drift - diffusion model, the hydrodynamic model plays an increasingly important role in simulating the behavior of the charge carrier in sub - micron semiconductor devices because it can exhibit velocity overshoot and ballistic effects for which are not accounted the classical drift - diffusion model
漂移擴散模型自上世紀五十年代初一出現，就得到了人們的廣泛關注。但隨著微電子技術的發展，它不能很好的解釋半導體中的有些現象，流體動力學模型就應運而生了。 -
Firstly we investigated the flow field and temperature field of diffusion fuel. when the direction of centrifugal force as same as the velocity of flow, there is a circumfluence of anti - clockwise
首先研究了擴散燃燒時的流場和溫度場。當離心力的方向與流速方向相同時，流場有一個逆時針方向的迴流區。 -
Self diffusion velocity
自擴散速度 -
The samples were welded at 750, 800, 850 and 900. the diffusion coefficients ( d ) of cu and ni at interface increased with the increase of welding temperature. and comparing with radiation heating, atom diffusion velocity at interface quickened
其它條件相同時，分別在750 、 800 、 850 、 900的溫度下採用脈沖大電流加熱連接cu和ni片狀材料，結果表明接觸面處cu和ni的擴散系數隨溫度升高而增大。 -
Dilution and dispersion in constant horizontal flow and bottom multi - port discharging was studied in accordance with the hydraulic model test. the influence of diffusion parameters ( jet angle, jet velocity, number of nozzle, riser space ) and environmental parameters ( water depth, water velocity ) on dilution were analyzed. the experimental results show that environmental parameters have prominent effects on wastewater dilution and dispersion, in addition to that, diffuser design parameters have significant influence on wastewater dilution and dispersion. for bailonggang outfall zone, jet angel is 10 or so, nozzle number is 16 or so
藉助於人工模型試驗，分析了恆定橫流底部多孔排放時擴散器設計參數（射流角度、射流速度、噴口個數） 、上升管間距）及環境參數（環境水深、環境流速）對污水近區稀釋擴散效果的影響，實驗結果表明，除了環境條件對污水稀釋擴散效果影響明顯之外，擴散器設計參數對污水的近區稀釋擴散也有顯著的影響，針對白龍港排放口水域，噴口射流角度宜控制在10左右，噴口個數取16個 -
A vertical two dimensional model for thermo stratified flows is proposed, which solves the velocity and pressure by a fractional step method, and large eddy simulation model is used to calculate the reynolds stress and turbulent diffusion effect
摘要建立立面二維水動力學與水溫耦合模型，用分步法求解流速和壓力，採用大渦模型計算紊動應力和紊動擴散。 -
In this thesis, a semi - classical model of the force on an atom is used to describe the motion of a two - level atom interacting with a standing wave laser field. the velocity dependent force and momentum diffusion are derived through optical bloch equations by using the matrix form of the continued fraction technique. by investigating the dynamic properties of atoms in laser field, we can control and manipulate the mechanical motion of an atom
本文利用半經典理論，從二能級原子在激光駐波場中所滿足的運動方程出發，推導出密度矩陣元所滿足的遞推關系，利用矩陣連分數方法求解出密度矩陣元，從而求出依賴于原子運動速度的光壓力與動量擴散系數，通過討論原子在激光場中的動力學行為，為原子在激光場中被囚禁、形成原子列陣以及可控制的量子態，從而為量子信息處理提供理論基礎。 -
Gas diffusion velocity
氣體擴散速度 -
6. the melting of the grain boundary is the reason of the semi - solid grain globalization, and its control factors were the atomic diffusion velocity and the liquid - solid interface curvature
6 、半固態晶粒球狀化的基本原因是晶界熔化，其控制因素是因液界面處原子擴散遷移的速度和界面曲率。
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