Half Metallic Bilayer Graphene

Charge neutral bilayer graphene has a gapped ground state as transport experiments demonstrate. One of the plausible such ground states is layered antiferromagnetic spin density wave (LAF) state, where the spins in top and bottom layers have same magnitude with opposite directions. We propose that lightly charged bilayer graphene in an electric field perpendicular to the graphene plane may be a half metal as a consequence of the inversion and particle-hole symmetry broken in the LAF state. We show this explicitly by using a mean field theory on a 2-layer Hubbard model for the bilayer graphene.Comment: 4+ pages, 4 figure

实施行管、医疗、护理联合总值班的实践与成效

Objective: To explore the effect of combined duty mode on discovery and control of medical nursing hidden trouble. Method: In order to make sure that patients are in the first place, we should take the mode of combined duty of administrative management, medical treatment and nursing. Results：The incidence of nursing errors and defects reduced, and patients’ satisfaction improved. the differences were statistically significant (P＜0.01 or P＜0.05).Results: Combined duty can the reduce medical nursing defects, improve the efficiency of quality health care services and the management efficiency.目的  探讨实施联合总值班模式对发现及控制医疗护理隐患的有效性。方法  以优化值班模式为前提，以病人为中心，采取行管、医疗、护理联合总值班的方法。结果  通过实施联合值班，护理差错及缺陷发生率降低，患者的满意度提高，实施前后比较差异均具有统计学意义（P＜0.01或P＜0.05）。结论  实施联合总值班，可以最大程度地预防医疗护理缺陷的发生，提高医疗护理服务及管理效率