射频

The asymmetric distributions of the surface optical second harmonic generation through azimuthally angular scans for thin silver films deposited on Si(111) wafers have been detected with different polarizations of output beams.

实验发现成长於Si(111)基板的银薄膜，以入射基频光、反射二次谐波的不同偏振组合观察到有不对称的方位角二次谐波强度分布之情形。

A possible configurate to improve the absorption efficiency of the pump energy has been proposed. With the theory of four waves mixing, we have demonstrated this scheme. By introducing the scheme into self-pumped conjugater, the performance of diode laser array with self-pumped conjugate was enhanced, the usage of incident light was improved apparently.

利用双四波混频作用区理论分析了该配置方式的合理性，并把这种配置方式引入到自泵浦相位共轭镜中，对整个利用自泵浦相位共轭镜的半导体激光器列阵实验方案进行了改进，从而显著提高了入射光束能量的利用率。

In this thesis, we demonstrate that elastin is one of major origins of the THG contrast under Cr:forsterite laser excitation operating at 1230nm, with selective visualization inside many tissues such as lung tissues and arteries.

在这篇论文中，在使用中心波长为1230nm的铬贵橄榄石雷射光源激发之下，证实了弹性蛋白是三倍频的主要来源之ㄧ，且在许多生物体中如肺组织和血管中有著选择性的影像。

We have combined 2PF microscopy with higher-harmonic optical microscopy based on the femtosceond Cr:forsterite laser with the aid of new transgenic lines tagged with HC-red fluorescent protein to obtain molecular, morphological, and structural protein information in biological tissues.

有著基因转殖技术的辅助及利用在於生物穿透较深波段的近红外光飞秒雷射光源，我们结合了双光子萤光显微术和倍频光学显微术来取得生物组织中的分子影像、型态学及有结构的蛋白质资讯。

To reduce the receiver complexity,a differential space-frequency transmit diversity scheme was developed with a noncoherent detection method based on the frame structure of the time domain synchronous-orthogonal frequency division multiplexing system.

在采用相干检测方法的发射分集方案中，进行信道估计需要付出很高的代价，为了降低接收端的实现复杂度，根据时域同步正交频分复用系统结构的特点，提出了差分空频发射分集及相应的非相干检测方法。

With the development of digital image enciphering techniques,there appeared a lot of methods including those based on Arnold transformation and affine transformation and those based on theories of Hilbert curve,knight-tour problem,Gray code,etc.

随着图像加密技术的发展，出现了各种各样的加密方法，其中有基于Arnold变换、仿射变换、Hilbert曲线、幻方、骑士巡游、Gray码、混沌序列和基于频域的置乱加密技术。

With the development of digital image enciphering techniques,there appeared a lot of methods including those based on Arnold transformation and affine transformation and those based on theories of Hilbert curve,knight-tour problem,Gray code and etc.However,there are few criteria to measure the merits and demerits of these methods.

随着图像加密技术的发展，出现了各种各样的加密方法，其中有基于Arnold变换、仿射变换、Hilbert曲线、幻方、骑士巡游、Gray码、混沌序列和基于频域的置乱加密技术，但是却缺少一种能有效衡量这些方法的置乱程度及反映加密次数与置乱程度关系的标准。

After comparing nonlinear simulation with linear, the results indicate that: Weak nonlinearity has definite and apparent influence on the distribution of acoustic fields and focused gain of array, which cause the distribution of waveform is closer to the array and the focused gain deteriorate ; the strong nonlinearity have a strong waveform aberration, because the other waves of non-fundamental frequency appear . No evident distinction is found in the effects between the oblique propagation and the vertical propagation, though less focused gain and influence caused by strong nonlinear produced by the acoustic diffraction which results in more attenuation in terms of oblique propagation.

将线性条件下的模拟结果与非线性条件下的模拟结果进行比较发现：弱非线性会对声场的分布和阵列聚焦增益产生一定的影响，使得声场分布波形比线性条件下的更加靠近阵列，聚焦效果变差；强非线性会使波形发生更严重畸变，这是由于产生了基频以外的其他频率声波引起的；非线性对斜向传播时声场分布的影响与垂直传播时的影响效果基本相同，但由于斜向辐射时的声波衍射造成的衰减要大于垂直辐射时的，因此聚焦增益和强非线性的影响都将小于垂直辐射时的情况。

An availible hydrodymanic code was developed to simulate laser-produced plasmas. Simulated results of laser-produced Al plasmas is in good agreement with the experimental data.

课题组还发展了现有的一维辐射流体力学模拟程序，对三倍频激光入射盘靶进行了数值模拟，并与汤姆逊散射得到的实验结果进行了比较。

We have obtained the hyperfine structure components of P(84) 5-5 transition with a SNR of 1000 at 1 s time constant. The diode laser is frequency stabilized to the hyperfine component o of the saturated absorption signal.

我们得到了此跃迁超精细结构成分的讯噪比是1000(在1秒的时间常数)；此二极体雷射稳频在o超精细结构成分上，所得到的频率稳定性优於10 kHz。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。