Operator radiation exposure is an important occupational hazard compounded over the course of an interventional radiologist's career. This study compared operator radiation dose to the eye and head for different positions around the patient. Compared with cases performed from the femoral region, exposures were 1.8 times higher at the side, and 1.6 times higher at the head, using conventional ap...

The middle levels conjecture asserts that there is a Hamiltonian cycle in the middle two levels of 2k + 1-dimensional hypercube. The conjecture is known to be true for k ≤ 17 [I. Shields, B.J. Shields and C.D. Savage, Disc. Math., 309, 5271–5277 (2009)]. In this note, we verify that the conjecture is also true for k = 18 by constructing a Hamiltonian cycle in the middle two levels of 37-dimensi...

This paper investigates the lateral vibration of single-layered graphene sheets based on a new theory called doublet mechanics with a length scale parameter. After a brief reviewing of doublet mechanics fundamentals, a sixth order partial differential equation that governs the lateral vibration of single-layered graphene sheets is derived. Using doublet mechanics, the relation between natural f...