X-ray screening is a demanding task. Threat objects can be superimposed by other objects, they can be difficult to recognize in cluttered bags, or when depicted from an unusual viewpoint. For improving airport security screening, it is essential to develop tests for pre-employment assessment in order to identify those people who are well-suited for the x-ray screening task. The X-Ray Object Rec...

It is widely believed that outflows of gamma-ray bursts are jetted. Some people also suggest that the jets may have structures like ǫ(θ) ∝ θ. We test the possibility of X-ray flashes coming from such jets in this paper. Both qualitative and quantitative analyses have shown that this model can reproduce most observational features for both X-ray flashes and gamma-ray bursts. Using common paramet...