In this paper, we research the imaging problems beneath volcanic area. We sort common asymptotic conversion point gathers and perform velocity analysis to establish the initial velocity which will be used in PSTM. By scanning migration velocity and V p/ V s, we get the optimum migration velocity and

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The experimental results show that:(1) for ideal spheres, the attenuation coefficient of velocity is constant, the air drag coefficient is slightly affected by the initial velocity and is a linear function of initial velocity, and (2) for real fragments formed by a warhead, the flight performances are different from ideal spheres, the air drag coefficient is affected by the flight velocity and is a linear function of flight velocity.

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Our results show that the behavior of the object in granular medium depends on its initial velocity.

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The paper analyses the reliability of 152 howitzer with Montc Carlo method, and calculatesthe projectile initial velocity of the gun.

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By improving the chemical reaction between Potassium Iodide and Hydrogen Peroxide, using initial velocity and activation energy calculation, this paper proposes and discusses the reaction mechanism in the reaction.

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As to migration velocity analysis, it is suggested to start with a little higher initial velocity.

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The variations of the residual velocity with the initial velocity are obtained.

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The speed of the ball early solid shot hurled from the last ball the distance and time to decide, the greater the force distance, the shorter the time, the solid shot the ball the greater the initial velocity, initial velocity of shots depends on the ability of students ...

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In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory. The key techniques used in numerical simulation of the three-dimensional extrusion from dies such as decision of boundary conditions, creation of initial velocity field, selection of penalty factor, high Weissenberg number problem , regeneration of the free surface were studied in detail.

中文題名聚合物異型材口模擠出三維流動研究副題名外文題名 Study on three-dimensional flow of polymer melts during the process of profile extrusion from dies 論文作者涂志剛導師柳和生包忠詡教授學科專業(yè)材料加工工程研究領域\研究方向學位級別博士學位授予單位南昌大學學位授予日期2001 論文頁碼總數(shù)148頁關鍵詞擠出成型聚合物材料擠出口模聚合物異型材館藏號BSLW /2003 /TQ320 /9 本文建立了求解擠出口模內冪律流體流動速度場的通用三維罰有限元模型美女网站是黄；對于非線性粘彈性的Phan Thien-Tanner流體性欧美13处交A片，為了降低模擬計算對計算機硬件的要求，并使模擬計算更加穩(wěn)定干干干干干干干干干干干干干干干干操，采用了一種去耦算法久久噜，包括罰有限元方法、擬體力方法和動量方程的橢圓類方程轉化方法亚洲精品中文涩，并建立了求解速度場和粘彈性應力場的總體有限元方程影音先锋色网站；對于PTT流體的擠出脹大問題，提出了擠出脹大熔體口模內外分離模擬法九色国产，這樣可以顯著降低數(shù)值模擬對計算機硬件的要求亚洲无码大黄片。

The results show that the rudder angle of torpedo, the battery activation time, and the initial velocity of torpedo all affect the trajectory of torpedo. The rudder angle ought to be set positive when torpedo is launched downwards,or set negative when torpedo is launched upwards to gain perfect trajectory. Meanwhile, shorter battery activation time and higher initial velocity of torpedo are necessary.

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