研究了用滤光片法产生50～60 keV的准单色X射线的条件，对输出的X射线进行了数种金属滤光片实验研究，选出合适的滤光片，通过实验对准直器......

Objectives: Early detection and treatment provide the opportunity to decrease the mortality rate from breast cancer. Qua......

We study the two-dimensional above-barrier penetration and the sub-barrier tunneling of non-relativistic particles and p......