搜索结果: 1-15 共查到“理学 BEC”相关记录21条 . 查询时间(0.093 秒)
研究两维轴对称有限深势阱中BEC的稳定性，利用变分法分别讨论了系统的基态和激发态特性。研究表明系统存在塌缩态、束缚态和扩散态三种状态，并计算出系统状态发生变化的耦合常数的两个临界值，发现势阱的形状与系统的稳定性紧密相关。同时在激发态下进一步讨论了原子间相互作用发生周期性调制的BEC的动力学特性，分析发现有限深势阱中BEC的塌缩可以通过周期性调制散射长度来控制。本文最后讨论了涡旋态下BEC的稳定性，...
Adequacy of nutritional intake from food and supplements in a cohort of pregnant women in Québec, Canada: the 3D Cohort Study (Design, Develop, Discover)
pregnancy cohort nutrient intakes diet supplements Dietary Reference Intakes (DRIs)
2018/11/15
Background: Assessments of the dietary intakes in various populations suggest that pregnant women have difficulty meeting all their nutritional requirements through diet alone. Few large-scale studies...
Critical Temperature Curve in BEC-BCS Crossover
Strong relevant regime condensation two-component system fermion monte carlo method function
2014/12/19
The strongly correlated regime of the crossover from Bardeen-Cooper-Schrieffer pairing to Bose-Einstein condensation can be realized by diluting a system of two-component fermions with a short-range a...
BCS-BEC crossover in spatially modulated fermionic condensates
BCS-BEC spatially modulated fermionic condensates
2011/7/20
Several novel multi-component fermionic condensates show universal behavior under imbalance in the number of fermionic species.
Scaling Behavior of Convolutional LDPC Ensembles over the BEC
Convolutional LDPC Ensembles BEC Information Theory
2011/9/2
Abstract: We study the scaling behavior of coupled sparse graph codes over the binary erasure channel. In particular, let 2L+1 be the length of the coupled chain, let M be the number of variables in e...
Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
Population imbalance three-component ultracold fermions
2010/11/17
We investigate the phase diagram and the BCS-BEC crossover of a homogeneous three-component
ultracold Fermi gas with a U(3) invariant attractive interaction. We show that the system at
sufficiently ...
BCS-BEC crossover in a two-dimensional Fermi gas
BCS-BEC crossover two-dimensional Fermi gas
2010/11/23
We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T = 0 using the fixed-node diffusion Monte Carlo m...
Finite dimensional global and exponential attractors for a coupled time-dependent Ginzburg-Landau equations for atomic Fermi gases near the BCS-BEC crossover
Finite dimensional global exponential attractors
2010/11/9
We study a coupled nonlinear evolution system arising from the Ginzburg-Landau theory for atomic Fermi gases near the BCS-BEC crossover. First, we prove that the initial boundary value problem genera...
Emergent gravitational dynamics from multi-BEC hydrodynamics?
Emergent gravitational dynamics multi-BEC hydrodynamics
2010/12/20
In this paper, we examine the possibility to implement some form of emergent Newtonian gravity
in a generic multi-component Bose–Einstein condensate. Parallely to what happens for the emer-
gence of...
Revivals in the attractive BEC in a double-well potential and their decoherence
Revivals attractive BEC double-well potential their decoherence
2010/11/11
We study the dynamics of ultracold attractive atoms in a weakly linked two potential wells. We consider an unbalanced initial state and monitor dynamics of the population difference between the two we...
Performance Analysis and Design of Two Edge Type LDPC Codes for the BEC Wiretap Channel
Performance Analysis Design of Two Edge Type LDPC Codes BEC Wiretap Channel
2010/12/10
We consider transmission over a wiretap channel where both the main channel and the wiretapper’s channel are Binary Erasure Channels (BEC).
Optimized IR-HARQ Schemes Based on Punctured LDPC Codes over the BEC
Optimized IR-HARQ Schemes Based Punctured LDPC Codes BEC
2010/12/6
We study incremental redundancy hybrid ARQ (IR-HARQ) schemes based on punctured, finite-length, LDPC codes. The transmission is assumed to take place over time varying binary erasure channels, such as...
Physicists in Germany and France have coupled a Bose–Einstein condensate (BEC) of ultracold atoms to the vibrations of a mechanical oscillator for the first time. Although the oscillator is relatively...
近日，由中科院物理研究所王如泉副研究员带领的实验小组成功实现了87Rb的玻色-爱因斯坦凝聚（BEC）。这是继中科院上海光机所、北京大学、中科院武汉物理数学所和山西大学之后的国内第五台BEC实验装置。
物理所的设计具有以下几个独到之处：第一，没有采用传统的双磁光阱结构，系统只有一套磁光阱和一个真空腔。这种设计省掉了双磁光阱之间的推送光束，提高了搭建光晶格的光学自由度，便于搭建二维光晶格，而传统的双...
2010年2月9日，由王如泉副研究员带领的实验小组在中国科学院物理研究所/北京凝聚态物理国家实验室（筹）成功实现了87Rb的玻色-爱因斯坦凝聚（BEC）。这是继中科院上海光机所，北京大学，中科院武汉物理数学所和山西大学之后的国内第五台BEC实验装置。