Electron Recapture near Thresholds

Electron states near graphene edge

The band structure of graphene near the Fermi surface is often well described by the effective mass approximation. In this approach electron wave function obeys the Diractype equation. To describe a number of effects it is necessary to supplement the equation with boundary conditions. Using the Hermiticity and the time reversal symmetry we derive the phenomenological boundary conditions for a m...

Analyticity Properties and Estimates of Resolvent Kernels near Thresholds

Spatial vision thresholds in the near absence of attention

It is well known that attention increases the discriminability of some types of spatial information. To ascertain more specifically which types of spatial information benefit from attention, we have measured spatial vision thresholds both in the presence and in the near absence of attention. To obtain near absence of attention, we induce subjects to focus attention elsewhere in the display by m...

On the observability of free quarks near their production thresholds

It is proposed to search for free quarks near their production thresholds. If the current-quark masses for u, d quarks are smaller than the pion mass, uū and dd̄ pairs produced below the pion pair threshold, would not have sufficient energy to hadronize and could be observable. In the case of large u,d quark masses and also for the heavy quarks, production near threshold may show hadronization p...

Electron Clouds Thresholds with 75 ns Bunch Spacing

In November 2010 electron cloud hallmarks appeared at the LHC when running beams with bunch spacings of 50ns. These hallmarks were pressure rise in the warm sections, heat loads in the cold regions, and emittance blow-up for last bunches in later batches [1]. Using a bunch spacing of 75 ns, pressure rises were detected in the machine as well, but at much more tolerable values (see Fig. 1). For ...