Creating vacancy is often highly effective in enhancing the hydrogen evolution performance of transition metal-based catalysts. Vacancy-rich Ni nanosheets have been fabricated via topochemical formation two-dimentional (2D) Ni2B on graphene precursor followed by boron leaching. Anchored graphene, a few atomic layered are first obtained reduction and annealing. Large number vacancies then genera...

The one-dimensional (1D) range profile is an important back scattering characteristic of objectives, which reveals the longitudinal distribution radar cross section (RCS) along detection beam. Since shape and posture can be reflected by 1D profile, it great significance in military to determine target orientation, velocity whether armed. In this paper, broadband terahertz 1D-range-profile measu...