spatial velocity 中文意思是什麼
spatial velocity
解釋
空間傳播速度-
The details of the construction and characteristics of the new finite - difference scheme are presented in this thesis, by using both the integration theorem and the taylor expansion theory. it is proved that the new approach has the second - order accuracy on the grids with axis - symmetric voronoi cells and at least has the first - order accuracy in general. according to this character of the scheme and the computational requirements of the finite - difference approach, a striping procedure is involved to decompose the velocity model into variable spatial size grids with a nearly constant tune step preserved
本文從積分定理和taylor展開兩個角度，詳細分析了基於voronoicell的非規則網格有限差分演算法的構造過程及性質，並且在理論上證明了本文的差分方法的精度與網格形狀的關系：當voronoicell為關于節點的軸對稱圖形時，本文差分方法具有二階精度；在一般的網格上，則至少具有一階精度。 -
Secondllv in the 1 d random traffic flow model. the relation function between the correlation and the creation. disappearance. brake probabilities of the vehicles is presented. according to the statistical mechanical approach to the spatial correlation functions. the theoretical results agree with that of the computer simulation. thirdh. based on the bml model. a main - road traffic flow model with two speeds on two dimensions is designed. this model simulate the traffic situation of one main road and several branches in the cit traffic lights placed on the crossing. vehicles breaking ~ vhile running and turning to other direction while jamming. we investigate the ~ ' e1ocitv and flo ~ ~ of the model when the initial densitvthe brake and turning probabilities. the green to signal rati3. thc number of the branches and the period of the signal are changed. then the reasons causing all the kinds of phenomena are analvzed. finallv. we simulate the bml model using the method of lattice boltzmann which ~ vas brought out by liu mu - renand obtain the velocity - density graph similar to the previous result. the upper critical densiw above which there are oniv jamming configurations. and the lo ~ ver critical density below which there are only moving configurations are the same as before. the boltzmann function which is on the lattices shows the moving and jaxmning transition obviouslv. thus it proves the possibilit of this method on the traffic research
接著，建立了和研究了二維二速的主幹道模型，該模型模擬了城市交通中一條主幹道，多條支道的交通情況，在幹道與支道的交叉路口設置紅綠燈，車輛在運行中可以有對突發事件發生反應的剎車，在發生堵塞時，路口的車輛可考慮通過轉向來緩解交通等各種實際情況的發生，給出了車輛演化的演化方程，並通過計算機模擬，研究模型在改變車輛的初始密度、剎車概率、轉向概率、支道數、紅綠燈信號的綠信比、紅綠燈信號周期等各種情況下支、主幹道車輛的速度、流量的變化，並分析在各種情況下交通狀況的成因，提出改善交通的有效措施。最後，在劉慕仁提出的用格子boltzmann方法研究一維決定論交通流的思路下，將此法推廣到對二維bml模型的模擬上，得到了與用以往方法的研究結果相類似的速度-密度圖線，且車輛從運動相到堵塞相轉變的上下臨界密度是一致的，同時分別給出車輛在處于暢通相和堵塞相時， boltzmann函數在格子上的分佈情況，進一步驗證了此法的可行性。 -
In general, the lens chromatic aberration and the group velocity dispersion lead to a broadening in the temporal and spatial intensity distributions at the focal plane and a decrease o
一般說來，透鏡色差和群速度色散會使焦平面上脈沖光束的時間、空間光強分佈展寬，峰值光強降低。 -
Under different positions of a tripping wire or speeds of the side jet, the controlled experiments were made, including the receptivity of the shear layer near jet exit to acoustic excitations, the spatial development of fluctuating velocity and the profiles of mean velocity
在不同絆線位置或不同旁射流流速條件下，研究了射流出口臨近剪切層對聲激勵的感受性，脈動流速向下游的空間演化及平均流速剖面。 -
The method permits the calculation of the three stages of shock wave evolution, and gives the temporal and spatial relationship of peak pressure, velocity, and profile of shock wave
文中採用流體動力學模型，解析地描述了脈沖強激光輻照靶材時，激波的產生及增強、維持和衰減規律，給出了激波峰值壓力、激波速度、激波波形的時空關系。 -
A series of experiments in a wider range of reynolds number were conducted for the investigation on the spatial and temporal distribution of the low - speed streaks in the near wall region of turbulent open channel flow. for the first time, the relationships between the spacing, the width, the length scale in the streamwise direction and the duration time of low - speed streaks and the reynolds number based on shear velocity were revealed
在水力光滑區和過渡區對明槽紊流近壁區的帶狀結構進行試驗，測量並分析了帶狀結構的分佈，首次揭示出低速帶間距、寬度、縱向尺度及持續時間等隨摩阻雷諾數的變化規律。 -
Results showed that, attribute data obtained by this way avoided deficiency of polygon overlap way, as a result, the logistical consistency between map data and attribute data reached over 90 % on average. database pivot precision was 0. 18mm, data quantity during manipulation was decreased greatly, data treatment was more convenient, computation velocity was boosted greatly. workload of map and table pretreatment and edition was mitigated on large scale, spatial data precision was increase
研究表明：用該方法獲得的屬性數據，避免了多邊形疊加方法的不足之處，能使圖形數據和屬性數據邏輯一致性平均達到90以上，數據庫點位精度達到0 . 18mm ，且操作中圖層數據量大大減小，數據處理更為方便，運算速度大為提高；減輕了圖表預處理和編輯的工作量，使空間數據精度提高。 -
By fem, the numerical simulation was carried out according to such models, many important hemodynamic variables, such as the tempo - spatial velocity field at every cross section of the artery, the pressure distribution, the secondary flow and the wss ( wall shear stress ) at the specific areas were obtained, which will help understand the biomechanics of coronary atherosclerosis furtherly. many investigators studied the stenotic artery by means of 2 dimensional models, which can only simulate the planar pulsatile waves and got, to some extent, some general results of the blood flow without considering the secondary flow and the reality of physiological conditions
本文的著眼點和研究的目的在於，希望利用在血流動力學方面的研究優勢，用有限元方法對動脈粥樣硬化的血流動力學問題進行數值模擬，研究動脈粥樣硬化在生成和發展過程中的血流動力學、血管壁生理及生物力學性能的變化規律，以及這兩種變化規律之間的相互作用與動脈粥樣硬化的發生和發展的關系，通過大量算例的對比分析，以期在這方面作些基礎而有實際價值的工作。 -
Aiming at illustrating how the regional evaporation capacity was affected by human activities, this paper, by adopting statistics method, analyzed the materials covering fifteen evapotranspiration sites in chao lake valley spanning twentity years from 1981 to 2000, and then explored the relationship between the features of spatial distribution of evapotranspiration and relief, temperature, wind velocity, the amount of precipitation and other factors, as well as on the characteristics of evapotranspiration variation within a year and the trend of its annual changes
採用了統計學方法，對巢湖流域15個蒸發點20年（ 1981 - 2000年）的資料進行了分析，初步探討了巢湖流域的蒸發量空間分佈特徵與地勢、氣溫、風速、降水量等因子的關系，以及蒸發量在1年內的變化特徵和年際變化趨勢，試圖說明研究時段內人類活動對區域蒸發量的影響。 -
By comparing the ideal joint and clearance joint for the deployment process of a spatial deployable truss structure in multibody dynamics, it is found that the existence of the joint clearance makes the movement discontinuous, and also found the attitude angle degree and angle velocity of the spacecraft are affected in the deployment for the joint clearance
通過對有無鉸接間隙的剛性空間展開桁架模型的計算結果比較，說明鉸接間隙的存在對于桁架展開過程的影響及這一過程對衛星的姿態角速度的影響，同時比較了有無鉸接間隙時鉸接處在展開過程中接觸力的變化。 -
With the help of adams and simulink ’ s union simulation technology, docking dynamics simulation in the initial conditions ( pose and velocity ) is given. by compare them with the result of the spatial two aerocraft ’ s docking model, principle of loop control system based on dynamics is proofed correct. by compare them with the experiment ’ s result, the virtual prototype model is certified correct
藉助adams與simulink的聯合模擬技術，在給定對接初始條件（位姿和速度）下，進行了對接動力學模擬，並與空間兩飛行器對接的模擬結果進行了比較，驗證了大迴路控制系統動力學控制原理的正確性;與試驗結果進行了比較，驗證了樣機模型的正確性。 -
The relationship between the spatial scale dimensions of the initial mesoscale vortex and the variation of typhoon intensity is also discussed. the results show that the interaction can intensify the maximum tangential velocity of typhoon under the condition of certain parameter ranges
結果表明：在一定的合理的參數條件下，中尺度渦旋和臺風渦旋的相互作用可以使臺風切向風速最大值增加，增加值為4 . 0m / s ，這個結論比m （
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