查询词典 bec

It is revealed that BEC and BCS is two limits of BCS-BEC crossover theory.

BEC是一大类宏观量子现象的物理根源，是超导、超流物理学的理论基础。

Yeah. I came from the BEC company.

是的。我是BEC公司的。

The topics covered include the basic concepts of information theory--entropy, mutual information, channel capacity, information rate, Shannon's noiseless coding theorem and Shannon's fundamental coding theorem; modeling of information sources--zero-memory and Markov models; modeling of information channels--BSC and BEC channels, additivity of information and cascaded channels; construction of compact source codes--Kraft inequality, compact codes, Huffman and LZW compression codes; and analysis and design of error-control channel codes--Hamming distance, binary linear codes and the parity-check matrix, Hamming codes, checksum codes, cyclic codes and the generator polynomial and CRC codes.

课程的内容包括：信息论的基本概念（熵、交互信息、信道容量、信息率、 Shannon无噪声编码定理和Shannon基本编码定理）、信源模型（无记忆模型和Markov模型）、信息信道模型（BSC 和 BEC模型、信息的可加性和级联信道），紧致信源编码设计（Kraft不等式，紧致编码，Huffman 和LZW压缩编码）以及差错控制信道码的设计与分析（海明距离，二元线性码，奇偶校验矩阵，海明码，校验和，循环码，生成多项式和CRC码）。

Chapter 1 reviews recent investigation in Bose-Einstein condensation, and analyzes critical point and condition of phase transition. Chapter 2 introduces the experiment of Mott insulator and superfluid phase transition in dilute atomic gases, theoretic mode and some studying. In chapter 3, we study the influence of dipole-dipole interaction of two component BEC in optical lattice, by Green function technique and mean-field approach. The results show that long range interaction and dipole-dipole interaction can be strongly influence the phase transition of two component.

本文内容分为四章，第一章对BEC近几年的研究回顾，分析了理想情况下凝聚的临界行为和凝聚条件；第二章我们介绍了光格子中绝缘-超流相变和理论模型及其描述；第三章我们利用格林函数和平均场近似的方法，对偶极-偶极相互作用在光格子中两分量BEC原子的超流-绝缘相变的作用进行了分析，结果表明偶极-偶极相互作用和长程相互作用对绝缘-超流相变有很大的影响。

In chapter 4, we investigate quantum statistical properties of atoms and photons in interaction of lithium-7 atomic BEC in the ground-state hyperfine sublevel with lasers.

第4章研究处于基态超精细亚能级的〓锂原子BEC与激光场相互作用的量子统计性质。

Maybe this essential difference comes from the non-identical property of the different component atoms in two-component BEC.

这种区别可能来源于双分量BEC中两种分量原子间的非全同性。

The results show that the fluctuation of the light field can be squeezed periodically. The initial occupancy of the BEC atomic levels has great influence on the squeezing properties of light and the period of oscillation of the squeezing is relating to the circle frequency of the light.

结果表明：光场在与原子BEC相互作用过程中呈现周期性压缩， BEC原子能级的初始占据率对光场的压缩特性具有重要影响，光场压缩的振荡周期与光场圆频率有关。

Believe it or not, now I do believe the trustiness of BEC and I am planning to challenge the BEC Higher in one year.

不管你信不信，我已不再怀疑 BEC 的权威，而我也打算着在接下来的一年里努力准备 BEC 高级。

BEC BEC network is to Shanghai to participate in net for the majority of BEC Cambridge Business English exam candidates to open up the learning garden, we provide you with a "news hot words: hardliner hardliners" information, click for hot news ...

BEC剑桥商务英语网是由沪江网为广大参加BEC剑桥商务英语考试的考生开辟的学习园地，我们为你提供了&新闻热词：hardliner 强硬路线者&相关信息，欢迎点击查看新闻热。。。

It is found that the two kinds of squeezing can be obtained at some conditions.and the interaction between atoms in BEC changes the period of fluctuation of light field and the amplitude of fluctuation of quadrature component.

由于BEC的独特物理性质及存在的广泛应用前景，BEC已成为一个十分活跃的理论和实验研究领域，实验上相继实现了原子激光，分子BEC等一系列重大进展[4~6]。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失