目的探讨二次谐波技术对胰腺肿块的诊断价值。
Objective To discuss the value of second harmonic imaging in diagnosing pancreatic masses.
提出了一种寻找最佳二次谐波产生方向的方法。
A method for determining the optimum direction in SHG is suggested.
并利用负载牵引法对二次谐波匹配网络进行了优化。
The second order harmonic output matching networks are optimized by load-pull method.
最后讨论了二次谐波加热和少数成份离子加热的实例。
Some examples are discussed for second harmonic heating as well as the minority heating.
还讨论了泵浦束的发散角对二次谐波转换效率的影响。
We have also discussed the effect of the beam divergence on the second harmonic conversion efficiency.
方法对行超声二次谐波心肌造影的30例患者进行观察。
Methods Observation were done in 30 old patients who successfully underwent myocardial contrast imaging using second harmonic imaging technology.
线性相移随机误差及光强信号二次谐波不敏感六帧算法；
Six-frame algorithm insensitive to the reference phase and signal secondhumorous wave;
目的探讨超声造影二次谐波成像技术在肝血管瘤中的应用。
Objective To investigate the application of SonoVuecontrast-enhanced ultrasound and second harmonic imaging in liver hemangioma.
对传感器信号处理采用的二次谐波反馈电路，电路为闭环系统。
Adopting the reactive circuit of twice harmonic to process the sensor signal, the system is closed loop.
对生物组织进行了超谐波成像，并与基波、二次谐波图像对比。
Superharmonic imaging is made for biological tissues and compared with the results from fundamental and second harmonic imaging.
目的采用二次谐波触发显像超声造影评价急性缺血心肌血流灌注。
Objective To assess the perfusion of acute myocardial ischemia with ultrasound contrast agent by intermittent harmonic imaging.
分析了各主要参数的变化对气体吸收曲线与二次谐波波形的影响。
The effect of model parameters on the sorption and desorption curves was simulated.
研究了银膜表面由于吸附吡啶分子而引起的表面二次谐波信号变化。
The changes in the SH signal due to adsorption of pyridine molecules on the Ag film were investigated.
它主要由二次谐波产生、和频产生、差频产生、光参量振荡等构成。
It mainly consists of harmonic generation, sum-frequency generation, difference-frequency generation, optical parametric oscillation and etc.
二次谐波强度自相关法是被广泛使用的超短光脉冲波形测量的方法。
And the second-harmonic intensity auto-correlation method is widely used to measure the ultrashort pulse wave.
以基波和二次谐波相互作用出发，作了必要的理论分析，并给出了实验结果。
The paper analyses in theory according the effects between basic and SHGwaves, and gives experimental results.
目的：利用实验性兔肝对二次谐波成像中的剂量-效应关系进行声学定量分析。
Objective: to have an acoustic densitometry (AD) analysis about the relationship between doses and effects in experiment rabbit liver with second harmonic contrast imaging.
在此基础上，对一种芪盐LB膜样品进行了变入射角的透射二次谐波产生研究。
Transmitted SHG signals were measured on a stilbazium salt LB monolayer with variable angle of incidence.
二次谐波可使谐振腔归一化阻抗发生变化，导致强声发生器频率响应曲线失真；
The second-order harmonic can change the Normalized Impedance of the resonance cavity, and cause the distortion of Frequency Response;
并测试了该混合晶体的二次谐波效应；讨论了二次谐波效应与晶体结构的关系。
The powder SHG effect of the mixed crystal was measured, and the relationship between the SHG effect and the crystal struture is discussed.
该材料在光电开关、非线性光学二次谐波、快响应液晶显示等方面有广阔应用前景。
The material has promising application prospects in fields of optoelectronic switches, nonlinear optical second harmonic, quick response liquid crystal display and the like.
苯基脲具有很强的二阶非线性光学效应，其粉末二次谐波产生效率为尿素的11倍；
A primary study was carried out and the results revealed that phenylurea had fairly strong nonlinearity, its powder second harmonic generation efficiency was 11 times larger than that of urea.
当激光场中含有乘性噪声时，乘性噪声能增强基波的涨落，同时抑制二次谐波的涨落。
However, the multiplicative noise can enhance the fluctuation of fundamental light, meanwhile it can reduce the fluctuation of the second harmonic light.
我们用光谱分辨的二次谐波方法测定了连续波同步泵浦染料激光脉冲形状的非对称性。
We have determined the pulse shape asymmetry in a synchronously pumped dye laser using the method of spectrum-resolved SHG correlation.
绿色发光二极管激光器提供了绝对优势相比，同等绿色输出二次谐波产生(倍频)设备。
The green-emitting laser diode offers a number of compelling advantages compared to an equivalent green-output second harmonic generation (SHG) device.
分别用二次谐波显像及彩色能量多普勒成像，观察造影前后局部损伤的位置、范围及回声。
Detecting visualization of segmental renal trauma on both second harmonic imaging(SHI)and color Doppler energy imaging(CDEI)before and after enhanced ultrasonography.
本文利用宏观非线性极化模型，分析了相干驱动内腔二次谐波过程中光场的动力学演化行为。
Using the macroscopic nonlinear polarization model, we discussed in detail the dynamic evolution behaviors of opt ioal field in coherent driving intraoavity second-harmonic generation (ISHG).
本文对在临界相位匹配条件下使用聚焦高斯光束在双轴晶体中产生二次谐波进行了理论分析。
Theoretical analyses are presented on the critically phase-matched second-harmonic generation (SHG) in a biaxial crystal with the focused fundamental Gaussian beams.
根据非线性半导体p N结再辐射特性，设计了一种基于二次谐波接收的非线性节点探测系统。
According to the nonlinear re-radiation characteristic of semiconductor PN node, the nonlinear node detection system for semiconductor junction targets based on second harmonic reception is designed.
根据非线性半导体p N结再辐射特性，设计了一种基于二次谐波接收的非线性节点探测系统。
According to the nonlinear re-radiation characteristic of semiconductor PN node, the nonlinear node detection system for semiconductor junction targets based on second harmonic reception is designed.
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