查询词典 average acceleration

Studied present measuring methods" advantages and disadvantages, and presented the necessity and importance of researching propellant transient heat transfer.2.according to 130 and aeronautic 90 rocket projectiles" structure, analysed and acquired physical and mathematical models for propellant transient heat transfer, also designed propellant temperature field simulation units for test.3.acquired discrete transient heat balance equation and temperature calculation program, and gave contrasting curves between experimental temperature values and program calculating temperature values as well as maximum errors and average square root errors between them.4.by programs based on the first class boundary condition, worked out temperature distribution in propellant temperature field simulation units at different time, analysed temperature field distribution law and main elements affecting heat transfer, acquired propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.5.established transient heat transfer mathematical model and temperature calculation program for the third class boundary condition, drew contrasting curves between temperature experimental values and calculation values and gave maximum errors and average square root errors between them, got temperature distribution in the simulation unit at different time and main elements affecting heat conduction, figured out propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.

分析了现有测试方法的优缺点，提出了研究推进剂瞬态导热的必要性和重要性。 2。根据130和航90两种火箭弹的结构，分析得到了推进剂传热的物理模型和数学模型，设计了推进剂温度场模拟实验装置。 3。得到了离散形式的瞬态热平衡方程和温度场计算程序，给出了实验温度与程序计算温度值的对比曲线及其最大偏差与均方差。 4。利用程序求出了第一类边界条件下、不同时刻推进剂温度场模拟装置中的温度分布，分析了温度场的分布规律和影响传热的主要因素，求出了推进剂质量加权平均温度和最大肉厚1／2处的温度时间曲线并给出了两者之间的最大偏差与均方差。 5。建立了第三类边界条件下的瞬态导热数学模型和温度计算程序，求出了温度实测值与计算值的对比曲线并给出了两者之间的最大偏差与均方差，得到了不同时刻温度场模拟装置的温度分布与影响导热的主要因素，求出了推进剂质量加权平均温度和最大肉厚1／2处温度及两者之间的最大偏差与均方差，讨论并确定了能代表130和航90推进剂温度的特征点的位置。

4Based on a fact that the price formula of Asian options can be transformed into that of vanilla European option when the time to maturity is less than or equal to the length of average, we skillfully obtain the analytical price formula for the option on the minimum or the maximum of two geometric average prices and generalize it to obtain the price formula of several average prices for the first time. We also apply the method of [121], which approximates the arithmetic average by the geometric average, to the pricing of opitons on the minimum or the maximum of two arithmetic average prices to obtain Its approximated price formula. Numerical results show that the approximated price is relatively accurate when the riskless interest rate is large or the option is in the money and the volatility of two underlying assets are high and its accuracy is a little reduced but still good when the dividends are considered. However, it is hardly affected by the sampling number.

我们基于观察到的一个事实即当离到期时间小于或等于平均期间时亚洲期权的价格可变换成普通的欧式期权的价格，从而巧妙地得到了两个几何平均价格的最小或最大值期权价格的解析公式，通过简单地推广，首次得到了多个几何平均时的价格公式；将[121]用于算术平均亚洲期权的定价方法推广到两个算术平均价格的最小或最大值期权，从而得到它的渐进公式，数值结果表明：渐进价格的准确性在无风险利率较大或期权为实值且两标的资产的波动率较小时较好，抽样的个数对它没有影响，但考虑红利时它稍有下降但仍较好。

Abstract］ objective to assess the efficacy and safety of transurethral resection of prostatewith plasmakinetic technique and to improve the qualities of pkrp.methods the data of 273 patients with benign prostatic hyperplasiawere retrospectively studied baseing on the mastering of pkrp.the average maximum urinary flow rate,the average residual urinary volumeand the average international prostate symptom score were analysed.results pkrp was successfully performed on 273 patients.intraoperative blood transfusion was performed in 6 cases,no obturator nerve reflex,transurethral resection syndrome,permanent urinary incontinence occurred and no death cases occurred.the follow-up time was 2～26 months with an average of 5.63 months,postoperative average qmax increased to 15.9 ml/s,and ruv decreased to 16.0 ml/s and the average ipss was 9.compared with those of preoperation,the differences were significant.conclusion pkrp has superior tissue cutting function and hemostasis.it is suggested that transurethral bipolar plasmakinetic resection of prostate be effective and safe.

目的 探讨经尿道双极等离子前列腺切除术的安全性与有效性，提高pkrp质量。方法回顾性分析273例良性前列腺增生患者pkrp资料，比较手术前后最大尿流率、膀胱剩余尿量及国际前列腺症状评分。结果 273例手术均顺利完成，术中输血6例，无闭孔神经反射、永久性尿失禁、经尿道电切综合征及死亡病例，随访2～26个月，平均5.63个月，qmax平均增至15.9 ml/s，ruv平均降至16.0 ml，ipss平均9分。与术前相比，各项指标均有明显改善。结论 pkrp具有良好的组织切割功能及可靠的止血作用，治疗bph安全有效。

A new method to measure the mechanical angular acceleration of rotating system is established by changing the exciting mode of AC asynchronous tachogenerator,and form a angular acceleration tachogenerator to measure the mechanical angular acceleration directly.

摘 要：提出的旋转系统机械角加速度直接测量方法通过对交流异步测速发电机励磁方式的改变，构成了能直接测量机械角加速度的测旋转角加速度发电机。

A new method to measure the mechanical angular acceleration of rotating system is established by changing the exciting mode of AC asynchronous tachogenerator, and form a angular acceleration tachogenerator to measure the mechanical angular acceleration directly.

提出的旋转系统机械角加速度直接测量方法通过对交流异步测速发电机励磁方式的改变，构成了能直接测量机械角加速度的测旋转角加速度发电机。

The acceleration of penetrator weapon when it irrupts into ground firm substance is twenty thousand times to hundreds thousand of times of gravity acceleration, the acceleration sensor that was required not only oppugns work circumstance but also identifies the process of concussion and irruption.

侵彻武器穿入地面等坚硬物质的加速度可达重力加速度的2 万倍至几十万倍，要求所用加速度传感器既能抗击该工作环境，又能识别冲击与钻入的整个过程。

Compliance steering operates only at certain lateral acceleration of vehicle. At low lateral acceleration, it doesn't work, the vehicle's performance is like the front wheel steering vehicle's; at high lateral acceleration, it can prevent the vehicle from losing its stability, which is caused by excess steering angle of the rear wheel, by the limiting position function of rubber mounting.

随动转向效应仅在特定的侧向加速度段起作用，在小侧向加速度段，随动转向不起作用，车辆性能与普通前轮转向车一样；而在很高侧向加速度段，它可以通过橡胶悬置的限位作用来确保车辆不致于因后轮转角过大而失稳。

10 healthy subjects received linear acceleration, continuous Coriolis acceleration and discontinuous Coriolis acceleration stimuli on different dates.

对10名健康被试者，在不同日期分别进行了线性加速度刺激、连续的科氏加速度累积刺激和间断的科氏累积加速度刺激，刺激的终止指标以被试者感觉有轻度植物神经症状为准。

Those problems include inverse position analysis of the machine, inverse and direct position analysis of the parallel locking mechanism, relationships of velocity and acceleration between cutter and actuators, Jacobian matrix of the machine, forward position computation of the machine, the links'velocity and acceleration of the driving chains, the links'velocity and acceleration of the locking mechanism, kinematics simulation of the machine, and so on. The Jacobian method presented in the thesis to calculate the direct position of the machine is of high efficient.

其中包括机床的位置逆解分析，平行机构的位置逆解分析，机床刀具与各主动关节之间的速度和加速度映射关系的求解，并联机床雅可比矩阵的计算，并联机床的位置正解计算，支链构件的速度和加速度计算，平行机构各构件的速度和加速度计算以及机床各运动学指标的仿真计算等。

To implement this guidance law, the thesis purposed one new target state model and adaptive algorithm for radar homing missile attacking maneuvering target, which is based on the slowly changing of the tangential acceleration and the normal acceleration of the spiral maneuvering and snaking maneuvering in target trace frame coordinate system, and on that the most of them equipped with Strapdown Inertial Navigation System, to meet the demand of the advanced homing missile to target state, It can estimate target position, velocity and acceleration accurately by real-time processing.

为了实现该制导律，重点针对先进自寻的制导律对目标机动运动状态的需求和导弹系统大都具有捷联惯导系统的条件，基于目标螺旋机动和蛇形机动的切向加速度和法向加速度在目标轨迹活动标架上缓变的特点，本文提出了一种建立在目标轨迹活动标架上的运动状态方程和扩展观测方程的自适应估计算法。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。