查询词典 wave velocity

With wave equation, we performed crosswell wavefield modeling. Velocity model is constructed from two sonic logs. It is readily distinguished the different characteristics of timeversusdistance for direct, upgoing, and downgoing waves on the resulted section.

利用声波方程建立井间波场数值模拟计算公式，选取一对实际井的声波测井资料建立了速度模型，进行井间数值模拟，得到了合成记录，对记录波场进行分析，能够清楚地观察到上，下行反射波和直达波的时距特征。

Shapes of microvoids in OFHC Cu and pure Cuare in difference. OFHC Cu target spalled under electric gun driven driven two stage metalflyer impact loading, the velocity profiles of rear surface were measured by VISAR. The spallstrength and debris size are according with the reported data and wave propagation law.

纯度不同的铜中微孔洞分布形貌存在差异，同时开展了电炮驱动二级飞片撞击无氧铜靶层裂实验，采用VISAR测量靶后自由面速度历史，测量的层裂强度和层裂片厚度与文献公布规律和冲击波传播规律基本符合。

In the second part presented in Chapter 4, the nonlinear kinetic Alfvén wave on the ion acoustic branch was studied, and a new type of the SKAWs on the ion-acoustic velocity branch is discovered in a low-β plasma.

在第二部分，研究了离子声分支上的非线性动力学阿尔文波并发现了在低β等离子体中的一类新型的SKAW。

Then using gasoline as fuel, compressed air as oxidizers, the experiments were conducted successfully. The results show that the measured detonation wave pressure and velocity are close to theoretical values.

采用汽油为燃料，压缩空气为氧化剂，进行脉冲爆震发动机原理性试验，所测得爆震波压力接近充分发展的理想爆震波压力，测得的速度与理论值接近。

The results show that:(1) The space-charge fields(include dc space-charge fields and ac space-charge fields) have important effect on the beam-wave interaction output power, make the saturated output power lower, saturated position delay;(2) The back-radio excited by the electron beam has little effect on the output power, and can be ignored;(3) The transverse motions of electron beam has some effect of the output power;(4) The means of phase velocity taped and bunch compression can improve the relativistic TWT efficiency, especially bunch compression can greatly improve the efficiency.

五、分析了相对论行波管三维非线性特性，分析结果表明：(1)空间电荷场（包含直流和交流空间电荷场）对注波互作用输出功率影响很大，会造成饱和输出功率减小，饱和位置推后；(2)电子注激发的反向辐射对输出功率影响比较小，基本上可以忽略不计；(3)电子注横向运行对注波互作用的直接影响比较大；(4)通过改变耦合腔内半径来调节慢波结构相速，采用相速跳变和预群聚的方法可以改善相对论行波管的效率，特别是采用预群聚方法，可以尽量提高相对论行波管的效率。

As field represents energy, all these changes spreading out in space, with a definite velocity, produce a wave.

因为场代表能，所以所有这些在空间中以一定速度传播的变化就形成一个波。

LFM ; radial velocity ; Doppler frequency ; saw tooth wave

线性调频；径向速度；多普勒频率；锯齿波

The relationships between strain and stress of several kinds of high strength fibers, such as Kevlar, Twaron and Dyneema were obtained, and the dependence of mechanical properties of fibers on the strain rate was gotten and explained from the microstructures and deformation mechanism of fibers. Then, the damage and failures of plates with the reinforcement of fibers under high velocity impacting were studied experimentally. Based on experimental results, a set of equations was presented to depicted the deceleration of penetrator. The dynamic response of fiber cluster and sandwich were simulated successfully with a new algorithm and code, which was developped by our group. The coupling effect of stress wave and thermal conduction could be considered with acceptable accuracy and CPU time.

其中，获得了以芳纶纤维为代表的7种纤维的动态应力应变关系，从材料微观机制解释了纤维束的应变率相关特征；得到了板材在高速冲击下的能量吸收机理，以及影响能量吸收机制转变的主要因素；发展了一种新型的原位光学测试技术，以之可以测量试件在冲击加载下的变形场及其演化，该技术除了在本项目应用外，还可以对剪切带的萌生演化、孔洞动态扩张规律进行较好的观察，以弥补相关研究中实验证据的缺乏；发展了含热传导的冲击动力学有限元程序，在侵彻、绝热剪切带、脉冲激光诱导结构破坏等问题的分析中得到了较好的应用。

Presence of multiples leads to poor quality in main stages of offshore seismic data processing, such as velocity analysis, stacking and imaging. Three basic multiple attenuating methods are reviewed; and a more effective multiple attenuator is achieved by joining them. As the first step, shot or receiver records are extrapolated by wave-equation datum algorithms. The extrapolation will establish a model of waterbottom multiples. Waterbotton multiples will then be removed by subtracting the extrapolated records from the original records. After that, predictive deconvolution is used to attenuate the multiples created by source ghost. Finaly, RADON transformation is adopted to separate peg-leg multiples and residual water-bottom multiples from the original data in the τ-p domain.

地震勘探尤其是海上地震勘探中存在着各类多次波，由于多次波的存在严重影响了速度分析、叠加、偏移成像等地震资料处理，海上多次波主要有全程多次波和层间多次两大类，为了压制海上不同类型的多次波，本文首先分析波场外推、预测反褶积和拉东变换衰减不同多次波的理论基础，然后联合采用这些方法，分别衰减全程多次波和层间多次波；即：首先对炮记录或者接收点记录进行波场外推，建立海底多次波模型，预测并减去全程多次波，然后利用预测反褶积衰减掉周期性明显的多次波，最后将数据转换到τ-p 域，用拉冬变换根据同一时间多次波和有效波在速度等方面的差异，进一步分离层间多次波和剩余的全程多次波，并在该域中切除分离出的多次波，从而实现联合多次波衰减处理。

In such conditions a shear head wave is generated, so that standard techniques based on monopole transducers can be used to measure formation shear velocity.

在这种情况下会产生横波首波，因此可以使用基于单极子传感器的标准技术测量地层横波。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。