Dynamical generation of dark solitons in spin-orbit-coupled Bose-Einstein condensates

We numerically investigate the ground state, the Raman-driving dynamics and the nonlinear excitations of a realized spin-orbit-coupled Bose-Einstein condensate in a one-dimensional harmonic trap. Depending on the Raman coupling and the interatomic interactions, three ground-state phases are identified: stripe, plane wave and zero-momentum phases. A narrow parameter regime with coexistence of stripe and zero-momentum or plane wave phases in real space is found. Several sweep progresses across different phases by driving the Raman coupling linearly in time is simulated and the non-equilibrium dynamics of the system in these sweeps are studied. We find kinds of nonlinear excitations, with the particular dark solitons excited in the sweep from the stripe phase to the plane wave or zero-momentum phase within the trap. Moreover, the number and the stability of the dark solitons can be controlled in the driving, which provide a direct and easy way to generate dark solitons and study their dynamics and interaction properties.Comment: 10 pages, 9 figur

Application of the light-front holographic wavefunction for heavy-light pseudoscalar meson in Bd,s→Dd,sPB_{d,s}\to D_{d,s}P decays

In this paper we extend our analyses of the decay constant and distribution amplitude with an improved holographic wavefunction to the heavy-light pseudoscalar mesons. In the evaluations, the helicity-dependence of the holographic wavefunction is considered; and an independent mass scale parameter is employed to moderate the strong suppression induced by the heavy quark. Under the constraints from decay constants and masses of pseudoscalar mesons, the $\chi^2$-analyses for the holographic parameters exhibit a rough consistence with the results obtained by fitting the Regge trajectory. With the fitted parameters, the results for the decay constants and distribution amplitudes are presented. We then show their application in evaluating the $B_{d,s}\to D_{d,s}P$ decays, in which the power-suppressed spectator scattering and weak annihilation corrections are first estimated. Numerically, the spectator scattering and weak annihilation corrections present a negative shift of about $0.7\%$ on the branching fractions; while, the predictions are still larger than the experimental data. Such small negative shift confirms the estimation based on the power counting rules.Comment: 10 pages, 5 figure

A Descriptive Model of Robot Team and the Dynamic Evolution of Robot Team Cooperation

At present, the research on robot team cooperation is still in qualitative analysis phase and lacks the description model that can quantitatively describe the dynamical evolution of team cooperative relationships with constantly changeable task demand in Multi-robot field. First this paper whole and static describes organization model HWROM of robot team, then uses Markov course and Bayesian theorem for reference, dynamical describes the team cooperative relationships building. Finally from cooperative entity layer, ability layer and relative layer we research team formation and cooperative mechanism, and discuss how to optimize relative action sets during the evolution. The dynamic evolution model of robot team and cooperative relationships between robot teams proposed and described in this paper can not only generalize the robot team as a whole, but also depict the dynamic evolving process quantitatively. Users can also make the prediction of the cooperative relationship and the action of the robot team encountering new demands based on this model. Journal web page & a lot of robotic related papers www.ars-journal.co

Facilitating Refugee Entrepreneurship Through Capability Approach Based Business Support: An Action Research

Since entrepreneurship is hindered as a major form of economic activity for refugees in host countries, a number of refugee business support initiatives have emerged globally. The refugee entrepreneurship literature demonstrates that the limited socio-economic circumstances of refugees create distinctive barriers to their entrepreneurship, whereas the literature on business support ignores these needs. This knowledge gap may result in refugees being perpetuated in their precarious economic situation by inappropriate support, as well as wasting social resources. Hence, this study conceptualises the refugee business support (RBS) based on the 'capability approach' (CA). In addition to explaining how refugees' distinct needs are shaped by their integration journeys, this framework defines the nature and embodiments of practically-adequate refugee business support. A two-cycle research-orientated action research (RO-AR) is conducted to implement the CA-based RBS in practice and develop its theoretical constructs. Throughout the RO-AR, 105 in-depth interviews, 62 participant observations, and five roundtable discussions were collected. To conceptualise the CA-based RBS as a practical-adequate concept, five theoretical constructs were successively calibrated and developed. These include: 1) integration-informed refugees' entrepreneurial needs; 2) refugees' three distinctive conditions in RBS; 3) three necessary embodiments of practically-adequate RBS (integration-informed diagnosis, readiness building, and capability building); 4) impact of practically-adequate RBS: reciprocal enhancement of integration and entrepreneurship, 5) keys to sustain and develop three necessary organisational capacities (relational, integration knowledge, and business support capacities) for delivering practically-adequate RBS. As a result of the formation of these five theoretical constructs, CA-based RBS as a practically-adequate concept is revealed to be sensitive to the interconnections between refugees' integration journeys and entrepreneurial activities. The identification and incorporation of the interconnections not only shapes the provision of practically-adequate support and the development of corresponding organisational capacities, but also overcomes the neglect of refugees’ needs in the existing knowledge system of business support

Health economics perspective: Genetic mutation test reports utilize mathematics and computer science to study and analyze cryptographic encryption strategies

Health economics is the focus of current research, and genetic testing has become an emerging and universal means of disease surveillance based on the ever-changing perspective of the global basic medicine in the field of cellular genetics. But genes represent the genetic information of the human physiology, and therefore must be handled in a confidential manner. With the use of current computational and codon knowledge structures, the authors propose and report strategies for problem solving in computer medicine based on genetic properties