Optimal traps in graphene

We transform the two-dimensional Dirac-Weyl equation, which governs the charge carriers in graphene, into a non-linear first-order differential equation for scattering phase shift, using the so-called variable phase method. This allows us to utilize the Levinson Theorem to find zero-energy bound states created electrostatically in realistic structures. These confined states are formed at critical potential strengths, which leads to us posit the use of `optimal traps' to combat the chiral tunneling found in graphene, which could be explored experimentally with an artificial network of point charges held above the graphene layer. We also discuss scattering on these states and find the zero angular momentum states create a dominant peak in scattering cross-section as energy tends towards the Dirac point energy, suggesting a dominant contribution to resistivity.Comment: 11 pages, 5 figure

Merchants and Commerce in Falmouth (1740-1775)

The article discussed the economic success of colonial Falmouth due to abundant time resources, and the many varied activities of the port\u27s mercantile leaders

The Historiography of The Margaretta Affair, Or, How Not To Let the Facts Interfere With a Good Story

This article discusses the development of the major myths that grew up around the Margaretta incident

Sensing human hand motions for controlling dexterous robots

The Dexterous Hand Master (DHM) system is designed to control dexterous robot hands such as the UTAH/MIT and Stanford/JPL hands. It is the first commercially available device which makes it possible to accurately and confortably track the complex motion of the human finger joints. The DHM is adaptable to a wide variety of human hand sizes and shapes, throughout their full range of motion

The Founding of Maine, 1600-1640: A Revisionist Interpretation

This article discusses the traditional theories around the settlement of Maine and concludes the overall pattern of settlement and early society in Maine is at odd with the traditional theory