Exact solution of phantom dark energy model

We investigate the phantom dark energy model derived from the scalar field with a negative kinetic term.By assuming a particular relation between the time derivative of the phantom field and the Hubble function,an exact solution of the model is constructed.Absence of the ’big rip’ singularity is shown explicitly.We then derive special features of phantom dark energy model and show that its predictions are consistent with all astrophysical observations.     

具有旋量场的量子虫洞

本文利用Hawking-Page的边界条件讨论了具有费米场的量子虫洞,导出了相应的Wheeler-DeWitt方程,计算了虫洞波函数,由虫洞波函数的分析,发现虫洞在a=0处出现几率密度为零,虫洞基态最可几半径为Planck尺度.     

用超声技术测定油煤混合燃料的煤浓度

本文介绍用超声技术在实验室装置及实际燃烧装置上在线测定COM中煤的浓度。实验表明,温度、COM的流速、油料品种,添加剂和水的加入量对测量的影响较小。测量误差为±2%。此装置能及时发现在输送系统中的不正常现象,如漏气及泵空转等。