参量

The new singular element at the end of a blunt crack is obtained,the new method for calculating stress intensity factors of blunt crack problems is presented.

利用其局部解构造了一种新的大曲率缺口位移模式；建立含大曲率缺口损伤结构有限元方程和与相应的缺口奇异单元；提出了求解大曲率缺口应力与应力强度因子等断裂参量的数值计算方法，数值算例说明本文方法是一种有效的数值计算分析方法。

The Southwell model is proved a high precision wavefront reconstructed algorithm. The relations between the precision of wavefront reconstructed and the parameter of wavefront sensor are studied.

研究了波前传感器参数、入射光束参量对波前重构精度的影响，提出了菲涅耳波带片的合理阵列数目。

Polarization information can be another dimension ofinformation source in remote sensing, hundreds of polarization images from American spaceshuttle proved this.

同非偏振信息测量相比，偏振信息测量能够获得更多更易于区分、判别、定量目标的特征信息参量。

Among these methods, generating single photon by SPDC is one of the effective techniques.

自发参量下转换过程是产生单光子的有效方法之一。

The studies on SPDC havereceived a great deal of attention.

因此，自发参量下转换过程的研究就成为学术界的焦点问题。

In this thesis, an efficient scheme of generating single photon with SPDC is presented, and the important application in quantum key distribution is also introduced.

本文主要提出了一种利用自发参量下转换获得高效单光子源的方案，介绍了高效单光子源在量子密钥分配的重要应用，并提出基于这种单光子源实现受控非门的理论方案。

Many experiments have been reported for momentum and frequency entangledstate with type I SPDC pumped by coninuous-wavelaser and are supported intheoretical analysis well.

在连续激光泵浦的I型自发参量下转换过程中，对空间、频率纠缠的双光子的实验研究工作已有不少报导，且在理论上也得到很好的解释。

A theoretical scheme of generating high efficiency single photon using multi-dots delay detection in the process of SPDC is presented, by which the enhancement of the efficiency of controlled not gate is also studied.

二、提出了一种利用自发参量下转换过程采用多点延时探测触发的方法获得高效单光子源的方案，并基于它提高了实现受控非门的效率。

The generating origin of the light field with SPDC expounded with the interaction of the pumping photons with the nonlinear crystals.

分析了单色泵浦光子流和量子真空噪声对非线性晶体的综合作用，从泵浦光与非线性晶体的相互作用过程解释了自发参量下转换光场的产生根源，推导了SPDC双光子态的数学表达式，并给出其几率解释

The creative works are as follows: 1. We show a scheme to generate high efficiency single photon via multi-dots delay detection with SPDC.

在这些研究工作中，属创新性工作的有两点： 1、提出了一种利用自发参量下转换过程采用多点延时探测触发获得高效单光子源的方法，可以利用它来实现基于单光子的量子密钥分配方案和量子计算中的量子逻辑门。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。