一束

This project was established based on the first cooperative development of optical in situ real time detecting technique probing the atomic scale layer-by-layer epitaxy growth of oxide film. Over the last three years, we have given full play to the advantages and characteristics of both sides and have finished the assumptions and plans of this subject satisfactorily. 1. In Institute of Physics, we set up advanced oblique-incidence reflectivity difference equipment and wrote one data acquisition procedure that made the simultaneous detection of optical signal and RHEED signal into reality. 2. The first observation of sustained oscillations over hundreds of monolayers in both real and imaginary signals during the epitaxy growth of SrNb0.1Ti0.9O3 on SrTiO3 substrate in LMBE testifies that oblique-incidence is an excellent method to detect and monitor film epitaxy growth real time. 3. For the first time, we verify that oblique-incidence reflectivity difference method can be used to monitor the layer-by-layer growth mode during continuous growth through the correspondence between optical signals to atomic or molecular step edge density on the growth surface. 4. Phenomenological analysis shows that optical signals comprise three parts, the first is proportional to the average thickness of the film and depends on the bulk phase dielectric response; the second is proportional to the coverage of terraces and depends on the dielectric response of atoms or unit cells in the terrace; the third is proportional to the coverage of step edges and depends on the effective dielectric response of atoms or unit cells at step edges. This makes oblique-incident reflectivity difference technique a quantitative macroscopic method to monitor film growth.

中文摘要：本课题是在合作首次发展了氧化物薄膜原子尺度层状外延生长光学原位实时探测方法的基础上立项的，三年来，我们充分发挥双方的优势和特点，圆满完成了课题的设想和计划。1、在物理所建立了一套先进的光反射差法装置，编写了计算机系统的数据采集程序，实现了两路光学信号和RHEED数据的同步采集和显示。2、用激光分子束外延在SrTiO3基底上生长SrNb0.1Ti0.9O3薄膜，首次观测到连续外延几百个原胞层，周期振荡的光反射差实部和虚部信号，证明了光反射差法是一种能原位实时探测与监控薄膜层状外延生长的好方法。3、首次验证了通过对生长表面原子或分子台阶密度的响应，光反射差法可用于原位实时监测在连续生长条件下薄膜的层式生长模式。4、通过唯象理论的研究，证明光反射差信号由三项组成，第一项只与薄膜的平均厚度和宏观光学电介质常数有关；第二项与分子台阶面覆盖度和台阶面上分子层的光学电介质常数有关；第三项与台阶边缘的覆盖度成正比，并和在台阶边缘的分子的有效光学介电常数有关。

At the first sign of the animal turning violent, the mahout or elephant driver can activate the battery-operated device by remote control, sending a nylon belt contained inside to wrap around the tusker's other hind leg.

大象一出现情绪猛烈的迹象时，象夫就可以用遥控器启动这个由电池供电的装置，送出装置内的尼龙束带，绑住象的另一只后腿。

Bunchy top disease can spread from plant to plant and is also spread by aphids.

束顶病能从一颗植物传播到另外一棵植物，而且也能通过蚜虫传播。

Bunchy top disease can spread from plant to plant and is also spread by aphids.

束顶病能从一棵植株传到另一棵植株，而且也能通过蚜虫传播。

The official emblem of France has a black and white ellipse ribbon during the French Revolution as her symbol. In the centre is a fascis standing for Justice and Authority, declaring the Freedom, Independence and Sovereignty.

法国的国徽采用大革命时期的一枚黑、白两色的椭圆形纹徽作为国家的标志，国徽的中心图案是一支代表正义与权威的束棒，庄严地宣告法兰西共和国的自由、独立和主权。

And when a branch had lanced his tunic and scored his ribs the day before he had only been able to growl and flail at it—a beast!

而在前一天，当一根树枝戳进他的束腰外衣，刮伤他的肋骨的时候，他所做的仅仅是吼叫着，向那个枝条不断地击打——这行动，真象一只野兽！

Dummling did not think long, but went straight into the forest, where in the same place there sat a man who was tying up his body with a strap, and making an awful face, and saying, I have eaten a whole ovenful of rolls, but what good is that when one has such a hunger as I.

只见那里坐着一个男人，腰带把身子束得紧紧的，一副愁眉苦脸的样子。&我吃了整整一炉黑面包，&他对小傻瓜说，可我饿得太厉害啦，吃这点儿东西又能顶什么事儿呢？

Snow is a great kindness invitation of severe winter, symbol of a kind of poetic.Everybody has a kind of palpitant feeling in heart in the snow day. Snow indicates the end of winter, also forebodes the coming of new year.

雪是严冬盛情的邀约，是一种诗意的象征，雪天在每个人心中有一种悸动的情怀，雪预示着冬天的束，也预示着新年的来临。

In order to solve this problem,for three dimensional cone-beam CT,a penalty SART is researched,at the same time,this means combined with ordered subsets is also researched.

为了解决这一问题，针对三维锥束CT情况，研究了一种增加惩罚项的联合代数迭代算法，同时研究了该算法与有序子集结合的方法。

A correction method for beam hardening, involving simple operations of the original polychrornatic projection sinogram, was presented based on the analysis of three physics properties implied by beam hardening. Its correction principle was deduced mathematically. A noise reduction method was proposed to suppress the noise enlarged by the harden correction by processing the high-frequency and the low-frequency components in the projection sinogram respectively.

在分析射束硬化现象具有的3个物理属性基础上，提出了一种对原始多色投影正弦图进行操作的硬化校正方法，并从数学上证明了其校正原理，针对该方法带来的噪声放大问题，研究了一种基于高、低频信息分类处理的噪声抑制方法。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新