超光子

In this paper, we investigate the light intensity-dependent superprism phenomenon in the two-dimensional Kerr nonlinear photonic crystal by nonlinear finite-difference time-domain technique. We show that when the intensity of the self-pumping beam is increased from 70 to 300 W/μm , the refraction angle of the beam can be tuned about 10 degree.

基于非线性时域有限差分法，我们模拟了克尔非线性光子晶体中的光敏超棱镜现象，结果发现，当光强变化230W/μm时，两束光在空间上能被分开10o，选取较大的基本功率将有助于提高其光强分辨率，。

So the Poynting vector and wave vector are antiparallel, consequently, the light is refracted negatively, and also there are many other unusual behaviors in LHM like reverse Cerenkov radiation, contrary Doppler effect etc.

所以近年来有关左手材料的研究受到了广泛的关注。2002年，科学家们发现当光波以一定角度入射到在光子晶体界面上时，光波在光子晶体中的传输也会出现和在左手材料中相同的现象：比如负折射和超透镜现象。

By using the non-degenerate TPA absorption process between both of pulses, a novel project if explored for compressing and shaping the self-compression pulse induced by FCA, in which shaping of self-compression can be optimized by adjusting the initial delay time and control pulse energy. In addition, the operations of ultrafast all-optical modulation and logic NOR gate are achieved by utilizing the non-degenerate TPA effect.

应用脉冲之间的非简并双光子吸收过程，探索出了对受自由载流子吸收作用而形成的自压缩脉冲进行压缩整形的新方案，通过调节脉冲之间的初始时延和控制脉冲的能量，可以优化自压缩脉冲的质量；另外，应用此效应，也实现了超快脉冲对连续光场的全光调制和超快逻辑非门的操作，在光调制过程中，发现了色散和初始啁啾都将改变所形成的调制暗脉冲的调制深度。

The result showed , the two dimensional image accumulated by photon emission at some hours. The spontaneous luminescence could be measured by means of photon counting and imaging acquisition. The luminescence intensity of root and leaf was different at the same plane image. It showed that PIAS could objectively display the spontaneous ultraweak photon, and this results provided experimental basis for resea...

结果表明，自发光子长时间积累可形成二维图象；光子计数和采集图象均可得到植物体的自发发光；通过实验探测到幼苗的根、叶在同一平面图象有不同的发光表现；光子成像系统可客观地比较生物自发超弱发光，为进一步研究超弱发光机理提供实验基础。

In this paper the thymus DNA of calf and the pBs plasmid are the main objects of our studies in ultraweak luminescence. By means of PIAS(Photon-counting image acquisition), ultraweak luminescence detector and Lambda Bio 40 of UV/VIS spectrophotometer, we studied the UL of DNA induced by the three oxygen free radicals: singlet oxygen Oa, hydroxy radical and superoxide anion(O2 ). We found that the OH can greatly increase the UL intensity of DNA.

本论文以小牛胸腺DNA和质粒pBs为实验材料，利用光子图像探测系统(Photon-counting image acquistion，PIAS)、微弱发光测量仪和UV／VIS分光光度计和生物统计学的成组比较法原理对单线态氧(~1O_2)、羟自由基、超氧阴离子(O_2~-)三种氧自由基诱导DNA超弱发光的变化过程进行了研究，结果发现这三种氧自由基中·OH能诱导DNA的超弱发光发生显著的增强变化，而其他两种氧自由基对DNA的超弱发光并无显著诱导作用。

In addition, the nonlinear processes such as cross-phase modulation, non-degenerate two-photon absorption, and stimulated Raman scattering must also be considered for double wavelengths propagating in waveguide.

在归纳分析了SOI对光信号处理的研究进展的基础上，进一步完善了超快脉冲在脊形硅波导中演变时所满足的线性和非线性传输方程，在此非线性方程中包括波导线性损耗、群速度色散和三阶色散等线性效应；同时也包含了自相位调制、简并双光子吸收、自由载流子吸收和自由载流子色散等非线性过程；当双光场在波导中传输时，脉冲之间的交叉相位调制、非简并双光子吸收和受激拉曼散射效应等非线性效应也被考虑。

Intense laser pulse causes neutral dissociation of superexcited NO molecule by way of multiphoton excitation, which is equivalent to single photon excitation in the extreme-ultraviolet region by synchrotron radiation.

由此证实和同步辐射导致的单光子激发一样，强激光导致的多光子激发同样可以引起NO分子的超激发，并且随后发生中性解离。

Experimental searches for tachyons have so far failed to reveal any.

对超光子的实验研究，至今还没有揭示出任何东西。

Although tachyons have never been seen in earth-based laboratories, mathematically they can exist

尽管在地面的实验室中，从来没有发现过超光子，但从数学上说，它是可能存在的。

This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield,the pulse length and time jitter of the produced photon pulse were predicted theoretically from the parameters of the electron bunch and the laser pulse,and the scattering angle. Preliminary experiments were successfully carried out with a 16 MeV backward-traveling-wave accelerator and the ns-Q switched laser provided by China Academy of Engineering Physics. This paper also introduces the 1.6-cell electron gun that was fabricated on site and the experiment with high RF power including the measurement of the electron bunche parameters. Based on these,we have designed an X-ray source,which is now under construction.

介绍了清华大学加速器实验室近年来关于汤姆逊散射超短X射线源的研究工作；研究了在任意散射角度下电子束参数和激光束参数对散射光子参数的影响，给出了散射光子的参数如光子产额、脉冲长度、时间抖动等与电子束参数、激光束参数和散射角度的关系；利用实验室已有的16 MeV反波行波加速器与中国工程物理研究院激光聚变研究中心提供的ns调Q激光搭建了汤姆逊散射初步实验平台并开展了实验研究；加工了1.6-cell光阴极微波电子枪，搭建了高功率实验平台，对产生的电子束参数进行了初步测量；对汤姆逊散射超短X射线源进行了设计并开展了相关的平台建设工作，对产生的X射线脉冲参数进行了模拟。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。