In noncommutative space, we examine the problem of a noninteracting and harmonically trapped Bose- Einstein condensate, and derive a simple analytic expression for the effect of spatial noncommutatlvity on energy spec...In noncommutative space, we examine the problem of a noninteracting and harmonically trapped Bose- Einstein condensate, and derive a simple analytic expression for the effect of spatial noncommutatlvity on energy spectrum of the condensate, it indicates that the ground-state energy incorporating the spatial noncommutativity is reduced to a lower level, which depends upon the noncommutativity parameter 8. The gap between the noncommutative space and commutative one for the ground-state level of the condensate should be a signal of spatial noncommutativity.展开更多
Given the morphological characters of purple crabs identical with that of the tea-green ones except the body color, it is expected that the purple crabs and the tea-green ones were from the same species. In order to i...Given the morphological characters of purple crabs identical with that of the tea-green ones except the body color, it is expected that the purple crabs and the tea-green ones were from the same species. In order to identify the phylogenetic relationships between them at the molecular level, we amplified and compared two conserved mitochondrial gene fragments of purple and tea-green crabs through PCR-SSCP and DNA sequencing analyses. The results showed that there was no distinct variation of DNA bands of both the CO1 and 16srRNA genes detected in polyacrylamide gels through SSCP analysis between purple and tea-green crab samples, and the following sequence analysis of color-different crab individuals presented 99.81% and 99.91% nucleotide sequence identity of the CO1 and 16srRNA genes respectively. These indicated that there was no species or subspecies differentiation between purple and tea-green crabs, meaning that they belonged to the same species, Portunus trituberculatus.展开更多
For Bose-Einstein condensation of neutral atoms in anisotropic traps at zero temperature, we present simple analytical methods for computing the properties of ground state and single vortex of Bose-Einstein condensate...For Bose-Einstein condensation of neutral atoms in anisotropic traps at zero temperature, we present simple analytical methods for computing the properties of ground state and single vortex of Bose-Einstein condensates, and compare those results to extensive numerical simulations. The critical angular velocity for production of vortices is calculated for both positive and negative scattering lengths a, and find an analytical expression for the large-N limit of the vortex critical angular velocity for a 〉0, and the critical number for condensate population approaches the point of collapse for a 〈 0, by using approximate variational method.展开更多
Objective： To investigate the association of XRCC4 polymorphic variants at G-1394T （rs6869366） with colorectal cancer susceptibility. Methods： In this hospital-based case-control study, the association of XRCC4 po...Objective： To investigate the association of XRCC4 polymorphic variants at G-1394T （rs6869366） with colorectal cancer susceptibility. Methods： In this hospital-based case-control study, the association of XRCC4 polymorphism with colorectal cancer risk in Chinese population was investigated. In total, 171 patients with colorectal cancer and 171 healthy individuals matched for age and gender were selected. The genomic DNAs of the patients and controls were extracted from peripheral blood and the 300 bp target DNA was amplified with Polymerase Chain Reaction. The products were then digested with restriction endonuclease HinclI, followed by agarose electrophoresis to identify the genotype. Results： We found a significant difference in the frequency of the XRCC4 G-1394T genotype between the colorectal cancer and control groups in female （1/127 vs 8/122, P〈0.05）. Those with G/T at XRCC4 G-1394T showed a decreased risk of colorectal cancer susceptibility compared with those with T/T （OR 0.113, 95%CI 0.014-0.932）. However, in overall population or in male, there was no significant difference of the distribution between the colorectal cancer and control groups. Conclusion： Our findings with decreased risk of colorectal cancer susceptibility suggested that the G allele of XRCC4 G-1394T were associated in female.展开更多
We analyze the ground-state properties and the excitation spectrum of Bose-Einstein condensates of photons and PPs in a two-dimensional optical microcavity. First, using the variational method, we discuss the ground-s...We analyze the ground-state properties and the excitation spectrum of Bose-Einstein condensates of photons and PPs in a two-dimensional optical microcavity. First, using the variational method, we discuss the ground-state phase transition of the two-component system. We also investigate the energy gap between the ground state and the first excited state. Moreover, by investigating the excitation spectrum, we also illustrate how the superfluid behavior of photons and PPs can be associated with the phase transition of the system.展开更多
Spin-orbit coupled Bosonic atoms confined in external potentials open up new avenues for quantumstate manipulation and will contribute to the design and exploration of novel quantum devices.Here we consider a quasi-tw...Spin-orbit coupled Bosonic atoms confined in external potentials open up new avenues for quantumstate manipulation and will contribute to the design and exploration of novel quantum devices.Here we consider a quasi-two-dimensional spin-orbit coupled Bose-Einstein condensate confined in an external harmonic potential,with emphasis on the effects of anisotropic spin-orbit coupling on the equilibrium ground-state structure of such a system.For the cases with spin-orbit coupling solely in x- or y-axis direction,the ground-state structure can develop to the well-known standing wave phase,in which the two components always form an alternative density arrangement.For a two-dimensional anisotropic spin-orbit coupling,the separated lumps first become bend,then form two rows of stripe structure along y direction with further increasing the strength of spin-orbit coupling in x-direction.Furthermore,the distance between these two rows of stripe structure is also investigated in detail.展开更多
基金The project supported in part by National Natural Science Foundation of China under Grant No. 10174086. Luo greatly appreciates Prof. J.Z. Zhang for valuable discussions.
文摘In noncommutative space, we examine the problem of a noninteracting and harmonically trapped Bose- Einstein condensate, and derive a simple analytic expression for the effect of spatial noncommutatlvity on energy spectrum of the condensate, it indicates that the ground-state energy incorporating the spatial noncommutativity is reduced to a lower level, which depends upon the noncommutativity parameter 8. The gap between the noncommutative space and commutative one for the ground-state level of the condensate should be a signal of spatial noncommutativity.
文摘Given the morphological characters of purple crabs identical with that of the tea-green ones except the body color, it is expected that the purple crabs and the tea-green ones were from the same species. In order to identify the phylogenetic relationships between them at the molecular level, we amplified and compared two conserved mitochondrial gene fragments of purple and tea-green crabs through PCR-SSCP and DNA sequencing analyses. The results showed that there was no distinct variation of DNA bands of both the CO1 and 16srRNA genes detected in polyacrylamide gels through SSCP analysis between purple and tea-green crab samples, and the following sequence analysis of color-different crab individuals presented 99.81% and 99.91% nucleotide sequence identity of the CO1 and 16srRNA genes respectively. These indicated that there was no species or subspecies differentiation between purple and tea-green crabs, meaning that they belonged to the same species, Portunus trituberculatus.
基金The project supported by the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Foundation under Grant No. T152501 and the Foundation of Education Commission of Zhejiang Province of China under Grant No. 20040599
文摘For Bose-Einstein condensation of neutral atoms in anisotropic traps at zero temperature, we present simple analytical methods for computing the properties of ground state and single vortex of Bose-Einstein condensates, and compare those results to extensive numerical simulations. The critical angular velocity for production of vortices is calculated for both positive and negative scattering lengths a, and find an analytical expression for the large-N limit of the vortex critical angular velocity for a 〉0, and the critical number for condensate population approaches the point of collapse for a 〈 0, by using approximate variational method.
文摘Objective： To investigate the association of XRCC4 polymorphic variants at G-1394T （rs6869366） with colorectal cancer susceptibility. Methods： In this hospital-based case-control study, the association of XRCC4 polymorphism with colorectal cancer risk in Chinese population was investigated. In total, 171 patients with colorectal cancer and 171 healthy individuals matched for age and gender were selected. The genomic DNAs of the patients and controls were extracted from peripheral blood and the 300 bp target DNA was amplified with Polymerase Chain Reaction. The products were then digested with restriction endonuclease HinclI, followed by agarose electrophoresis to identify the genotype. Results： We found a significant difference in the frequency of the XRCC4 G-1394T genotype between the colorectal cancer and control groups in female （1/127 vs 8/122, P〈0.05）. Those with G/T at XRCC4 G-1394T showed a decreased risk of colorectal cancer susceptibility compared with those with T/T （OR 0.113, 95%CI 0.014-0.932）. However, in overall population or in male, there was no significant difference of the distribution between the colorectal cancer and control groups. Conclusion： Our findings with decreased risk of colorectal cancer susceptibility suggested that the G allele of XRCC4 G-1394T were associated in female.
文摘We analyze the ground-state properties and the excitation spectrum of Bose-Einstein condensates of photons and PPs in a two-dimensional optical microcavity. First, using the variational method, we discuss the ground-state phase transition of the two-component system. We also investigate the energy gap between the ground state and the first excited state. Moreover, by investigating the excitation spectrum, we also illustrate how the superfluid behavior of photons and PPs can be associated with the phase transition of the system.
基金Supported by National Natural Science Foundation of China under Grant No.61361002the Applied Fundamental Research Projects of Yunnan Province under Grant No.2013FZ121
文摘Spin-orbit coupled Bosonic atoms confined in external potentials open up new avenues for quantumstate manipulation and will contribute to the design and exploration of novel quantum devices.Here we consider a quasi-two-dimensional spin-orbit coupled Bose-Einstein condensate confined in an external harmonic potential,with emphasis on the effects of anisotropic spin-orbit coupling on the equilibrium ground-state structure of such a system.For the cases with spin-orbit coupling solely in x- or y-axis direction,the ground-state structure can develop to the well-known standing wave phase,in which the two components always form an alternative density arrangement.For a two-dimensional anisotropic spin-orbit coupling,the separated lumps first become bend,then form two rows of stripe structure along y direction with further increasing the strength of spin-orbit coupling in x-direction.Furthermore,the distance between these two rows of stripe structure is also investigated in detail.
