primary wave

Determination of Formaldehyde Content in Water by Adopting New Spectrophotometry with Primary and Secondary Double Wave Length

主次双波长新分光光度法测定水中甲醛含量

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When the primary air blast wave from the explosion strikes the ground, another blast wave is produced by reflection.

当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。

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Conclusion Abnormal primary T wave in pilots was function in majority, the prognosis was fond of it, It is no effect on pilots make fly under usual conditions.

结论现役飞行人员的原发性T波异常绝大多数属功能性T波异常，预后良好，一般不影响飞行。

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The fields of parametric transient signal array in two cases of linear absorption ( absorption limiting) and nonlinear absorption ( saturation limiting) of the primary wave, are studied by numerical calculation and experimentation. The theoretical computational results are in fair agreement with experimental data.

对于原波的线性吸收（吸收限制）和非线性吸收（饱和限制）情况下的参量阵进行了理论计算与实验研究，取得了较满意的一致性。

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Preliminary observation of the hemodynamic changes of primary hypertension with wave intensity

应用波强技术初步评价原发性高血压患者血流动力学变化

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Experimental research on the problems of drift of primary wave at Beijing Network

北京台网初至波漂移问题的实验研究

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Based on the theory of protective engineering and blasting, the damage effects of primary fragments, shock wave and vibration in destruction of bygone aero-bomb and shell are discussed.

分别根据工程防护和工程爆破理论，对航、炮弹销毁时的弹片、冲击波和振动等安全距离计算进行了对比研究，有关研究结论可供销毁废旧航、炮弹的环境安全评估参考。

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The method has been applied to several synthetic datasets generated by simple convolution and finite-difference model ( FDM) technique, and the results show that our method can separate primary wave and multiple wave effectively.

简单的褶积模型和复杂的有限差分模型资料处理结果表明，本文提出的方法可以有效地分离一次波和多次波。

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The primary study of wave transmission within human biliary tract

胆管系波传输初探

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Relationship between travel time difference of maximum surface wave from primary wave observed by Tianshui seismic station and epicentral distance

天水地震台最大振幅面波与初至波到时差和震中距的关系

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The control system of active noise attenuators in ducts. by processing the noise signal detected by the microphones, generates a signal exciting the secondary sound sources to radiate a sound wave cancelling the primary sound wave in the downstream.

管道有源降噪器的控制系统根据传声器检测到的噪声信号，经过加工处理，产生激励次级声源的信号，使其产生的声波在下游与原来的噪声相抵消。

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Analysis of Abnormal Primary T Wave in 196 Pilots

飞行人员原发性T波异常196例分析

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The method for theoretical calculation of parametric transient signal array, in which the nonlinear absorption of primary wave has been taking into consideration, is presented.

提出考虑到非线性吸收时计算暂态信号参量阵的计算方法。

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Direction of primary movement of P wave can change after major earthquake.

地震群的形式出现；主震过时，P波初动方向改变。

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This integral can describe the efficiency of second-harmonic generation accompanying the primary Lamb wave time-domain pulse, as well as the dispersion degree between the primary and the double frequency Lamb waves.

该积分表达式可表征基频兰姆波时域脉冲传播过程中的二次谐波发生效率，以及基频与二倍频兰姆波模式之间的频散程度。

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Improving offshore reflection techniques in consideration of all aspects of a primary seismic wave

从地震纵波的全貌看海上反射法地震技术的改革

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The first is a smaller, primary wave that travels at seven kilometers per second.

第一种主要的小型波以每秒7千米的速度传播。

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The first type of body wave is the P wave or primary wave.

第一种体波是P波或者地震纵波。

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It is significant to apply geology characteristic information related with target layers supplied from primary wave 、 transverse wave ( and conversion wave) for searching complicated concealable trap and structure.

综合应用地震纵波、横波（及转换波）所提供的与目的层相关的地质特征信息对寻找复杂的隐蔽性圈闭、构造有着十分重要的意义。

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This concludes that on the middle and deep seismic record, the main frequency of reverberation can be much higher than that of primary wave within a same travel time window.

此结论表明：在中深部的地震记录上同一时间段的海水鸣震主频可显著高于一次反射波的主频。

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According to records of 338 earthquakes in recent years by SK seismograph of Tianshui seismic station, a formula of relationship between travel time difference of maximum surface wave from primary wave and epicentral distance is given by least squares method.

根据天水地震台SK地震仪近年来记录的338个震例的资料，用最小二乘法求出最大振幅面波与初至波到时差同震中距的关系式，并与JB表进行了对比。

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The subharmonic instability can be found in a wide extent of the frequencies and Reynolds numbers and the growth rates and amplification factors of amplitude are much higher than that of the primary wave. The secondary subharmonic resonance may be an intrinsic transition mechanism of compressible boundary layer.

二次亚谐波在很宽频率和雷诺数范围内不稳定，其增长率和幅值放大因子都远大于初始波，二次亚谐共振是可压缩边界层转捩的内在机制。

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The calculation method of primary wave and second wave speed were studied when the oil saturation and effective pressure of unconsolidated sandstone reservoir with high porosity in X Oilfield changed.

研究了X油田高孔低胶结砂岩储层在含油饱和度和压力变化时纵、横波速度计算方法，并将计算数据与实际测井资料进行了对比。

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Through second-order perturbation approximation and modal expansion approach, the second-harmonic generation of a primary Lamb wave propagating in layered structures has been analyzed, and the general solution to second-harmonic displacement fields has been obtained.

采用二阶微扰近似和模式展开方法，对分层结构中兰姆波的二次谐波发生问题进行了深入研究，得到了二次谐波声场的一般表达式。

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A primary seismic wave from an explosive source is a pulse response, and its periodic vibration originates from seismic pulses.

爆炸震源的地震纵波是脉冲性质的。周期振动是地震脉冲引起的次生振动。

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Ignite secondary wave, primary wave and ignite timing signal wave can provide valuable data about each air cylinder ignition and combustion status.

结果表明：1.点火次级波形、初级波形、点火正时信号波形能够提供有关各个气缸点火和燃烧情况的关键信息。

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The test results showed that, with the increase of the ratio of Es to Eb, the peak values of the primary explosive stress wave increased while that of the secondary wave decreased.

实验结果表明，随着Es／Eb比值的增大，原生爆炸应力波的峰值随之增大，而次生爆炸应力波的峰值则相应减小。

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The Finite Element Numerical Method of 3-D Nonlinear Primary Wave Equation in Isotropy Elastic Solid Medium

各向同性弹性固体中三维非线性纵波方程的有限元解法

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