Self-Trapping of Bose-Einstein Condensates in an Optical Lattice: the Effect of the System Dimension

In the present paper, we investigate the dynamics of a Bose-Einstein condensates (BEC) loaded into an deep optical lattice of 1D, 2D and 3D, both analytically and numerically. We focus on the self-trapping state and the effect of the system dimension. Under the tight-binding approximation we obtain an analytical criterion for the self-trapping state of BEC using time-dependent variational method. The phase diagram for self-trapping, soliton, breather, or diffusion of the BEC cloud is obtained accordingly and verified by directly solving the discrete Gross-Pitaevskii equation (GPE) numerically. In particular, we find that the criterion and the phase diagrams are modified dramatically by the dimension of the lattices.Comment: 8pages, 9 figure

The future trend for the system reform of urban community governance in China

Although the community contribution in China has achieved great success after nearly 30 years of development, there still exist some unfulfilling phenomena that do not reach the expected effect. There are various reasons account for it. For instance, government departments do not define their positioning clearly, the community autonomy is not desirable enough, community residents are lack of participation awareness and relevant laws and regulations are absent. Thus, the future trend for the system reform of urban community governance should be focused on the following aspects. Paying more attention to the role of government in social governance is one of the routes. Meanwhile, the community should improve their performance. In addition, taking the cultivation of citizen consciousness seriously and strengthening the construction of relevant laws and systems are also of great importance

Impact of IT Unit’s Decision Right on Organizational Risk Taking in IT

The objective of this study is to understand how the company’s risk-taking decisions in IT adoption are influenced by the decision right of its IT unit. The study builds a theoretical framework capturing how the IT unit’s decision right influences two determinants of risk taking, perceived risk and risk propensity. This framework also illustrates how the impacts of these two determinants on the actual actions of IT adoption are moderated by the IT unit’s decision right. The framework is empirically tested using a dataset on the adoption of electronic supply chain management (e-SCM) systems. The findings suggest that the IT unit’s decision right is not associated with the decrease in perceived risk. However, it is associated with the increase in risk propensity. Moreover, the IT unit’s decision right strengthens the positive association between risk propensity and e-SCM adoption, and weakens the negative association between perceived risk and e-SCM adoption

In vitro conservation of native Chinese wild grape (Vitis heyneana Roem. & Schult) by slow growth culture

The aim of the present research work was to develop a protocol to preserve Chinese wild grape by slow growth conservation. Spectacular success was achieved in preserving shoot apices of Vitis heyneana under slow growth conditions. The optimized nutrient formulation to maintain slow growth of cultures was Murashige and Skoog (MS) media contained 5 g∙L-1 agar, 0.05 mg∙L-1 indole-3-butyric acid (IBA) and 0.1 mg∙L-1 indole acetic acid (IAA) and 0.5 mg∙L-1 abscisic acid (ABA). The best osmotic adjustment of nutrient medium was achieved by employing 10 g∙L-1 mannitol where 47.78 % cultures could be conserved up to 12 months without any subculture. Among different combination of air breathable film area (ABFA), light intensity and chlorocholine chloride (CCC) concentration, used for increasing the subculture period, 19.63 mm2 ABFA with 5.0 g∙L-1 CCC cultured under lower light intensity suited best for slow growth conservation with 48.00 % microplants were able to survive 10 months without subculture. Further tests showed that the CCC had a negative effect to grape conservation. Cultures responded better when incubated at 10 °C compared with the control (25 °C). Our study also found that the combination of factors were also more beneficial to grape conservation than that of a single factor. 100 % survived shoots by slow growth conservation could regenerate to normal plantlets and transplant successfully. Transplanting plantlets showed no obvious difference in morphology with the control and the maternal parent in the field.