Silicene is a phantom material

α-Silicene as oxidation-resistant ultra-thin coating material

By performing density functional theory (DFT)-based calculations, the performance of α-silicene as oxidation-resistant coating on Ag(111) surface is investigated. First of all, it is shown that the Ag(111) surface is quite reactive against O atoms and O2 molecules. It is known that when single-layer silicene is formed on the Ag(111) surface, the 3 × 3-reconstructed phase, α-silicene, is the gro...

Influence of phantom material and phantom size on radiographic film response in therapy photon beams.

The energy dependence of radiographic film can introduce dosimetric errors when evaluating photon beams. The variation of the film response, which is attributed to the changing photon spectrum with depth and field size, has been the subject of numerous publications in recent years. However, these data show large unexplained differences in the magnitude of this variation among independent studie...

Is the January Thaw a Statistical Phantom?

JANUARY 2002 AMERICAN METEOROLOGICAL SOCIETY | M eteorological conditions that tend to occur on or near a specific calendar date more frequently than chance might suggest have been termed singularities (e.g., Huschke 1959) or calendaricities, a term introduced by Brier et al. (1963) to avoid confusion with the mathematical usage of “singularities.” These features are commonly identified as cons...

An easily made, low-cost, tissue-like ultrasound phantom material.

Ultrasound phantoms are generally of two types. One mimics the acoustic properties of tissue (with regard to the speed of sound, average attenuation, etc.). The main purpose of the other is to approximate the sonographic appearance of tissue. The latter is often used as a biopsy training aid. Those which mimic the acoustic properties of tissue have been constructed of agar with suspended graphi...

Silicene: Recent theoretical advances