Nuclear chain reactions are, by now, commonly used in the nuclear reactors, and thus it seems that there is no basic problem in fission processes from the scientific point of view. However, the criticality accident th...Nuclear chain reactions are, by now, commonly used in the nuclear reactors, and thus it seems that there is no basic problem in fission processes from the scientific point of view. However, the criticality accident that occurred in JCO in 1999 suggests that one should carefully examine this accident from the nuclear physics point of view. Indeed the chain nuclear reactions should have taken place in the small area of space with 45 cm diameter disk times 30 cm height tank. In fact, when people carry the uranium nitrate solution into sedimentation tank, then this solution with uranium should get into the critical state at the 45? of uranium nitrate solution. The root cause of the accident should not be very simple from the nuclear physics point, and it should be quite important to examine why the uranium nitrate solution with 45? could have become critical.展开更多
We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform...We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform analysis.The swirling of water in the container had three frequency components;the frequency responses of each frequency component are reported herein.When swirling occurs in a rotating cylindrical container,it was found that the wave rotating in the same direction as the rotation of the cylindrical container and the wave rotating in the opposite direction to the cylindrical container exist at the same time.The swirling direction was determined by the relationship of these magnitude.展开更多
文摘Nuclear chain reactions are, by now, commonly used in the nuclear reactors, and thus it seems that there is no basic problem in fission processes from the scientific point of view. However, the criticality accident that occurred in JCO in 1999 suggests that one should carefully examine this accident from the nuclear physics point of view. Indeed the chain nuclear reactions should have taken place in the small area of space with 45 cm diameter disk times 30 cm height tank. In fact, when people carry the uranium nitrate solution into sedimentation tank, then this solution with uranium should get into the critical state at the 45? of uranium nitrate solution. The root cause of the accident should not be very simple from the nuclear physics point, and it should be quite important to examine why the uranium nitrate solution with 45? could have become critical.
文摘We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform analysis.The swirling of water in the container had three frequency components;the frequency responses of each frequency component are reported herein.When swirling occurs in a rotating cylindrical container,it was found that the wave rotating in the same direction as the rotation of the cylindrical container and the wave rotating in the opposite direction to the cylindrical container exist at the same time.The swirling direction was determined by the relationship of these magnitude.
