The collapse solution of a star with uniform density and zero pressure given in the classic paper of Oppenheimer and Snyder is proved to be incomplete; it cannot correctly connect the Friedmann and Schwarzschild metrics as the interior and exterior solu tions.
By optimization of the properties of the oxide powder,slurry compositions and the condition of tape casting,the～0.2 mm-thick ceramic sheets were obtained,with smooth surfaces,a homogeneous microstructure and a relative density of ～96%.
According to the requirements of metallic card clothing heat treatment techniques,a 100kHz/5kW(Pulse-Symmetrical modulated,PSM)power control serial-resonant DC/AC inverter is used in metallic card clothing heat treatment high efficiency induction heating power.
Enlarged liver with homogeneous density was seen in 10 cases (90.9%), while splenomegaly of inhomogeneous density with scattered low-density, rim-enhanced foci (0.3～2.5 cm) was seen in all 11 patients.
Based on statistics, a new equation shown below was derived to represent the physical adsorption on solid surfaces after modifying the assumptions used by Langmuir for deriving the equation of monomolecular adsorption: